Patent Application
20230192040
This application claims priority to German Priority Application No. 102021214570.1, filed Dec. 17, 2021, the disclosure of which is incorporated herein by reference in its entirety.
The disclosure relates to an electrohydraulic brake module for a motor vehicle brake system.
Electrohydraulic brake modules of this type are known from the prior art. They combine the function of brake request detection, brake pressure generation of brake pressure boosting with the aid of an electric motor drive, and vehicle stability regulation, which influence the driving and braking behaviour of the vehicle during driving operation by the wheel brakes. The brake request corresponds to the brake pedal deflection which the driver of a corresponding motor vehicle brings about by way of the actuation of the brake pedal. As is known, a brake pedal of this type can be applied in one direction for brake actuation and is reset again during release of the brake pedal, that is to say during ending of the actuation. An electrohydraulic brake module of this type usually has a hydraulic block with hydraulic functional elements such as, for example, solenoid valves, connecting channels and a pump unit for generating the brake master pressure. Here, in one customary arrangement, the pump unit includes a cylinder bore which is machined in the hydraulic block and a piston which dips into the cylinder bore. The piston is driven in the axial direction via an electric motor and a rotation/translation gear mechanism, as a result of which brake fluid is displaced in the cylinder bore and brake pressure is built up. in order to open-loop or closed-loop control the respective required brake pressure, the rotor position of the rotor of the electric motor is usually detected by sensors and is evaluated electronically. Electrohydraulic brake modules of this type prevalently also have a sensor system for the electronic detection and evaluation of the brake pedal travel. Furthermore, these brake modules comprise electronic circuits, by way of which the sensor signals are processed and by way of which the above-described stability regulation arrangements are assisted or provided. Electrohydraulic brake modules of this type usually also have an electronic controller for controlling the electric motor and the solenoid valves. The indicated components are usually joined together to form one modular unit. The electronic controllers and the electric motor are usually encapsulated by way of one or more housings.
Brake functions have to be provided such that they operate exactly and are redundant. If, in the case of the failure of a brake module or individual functions within the brake module, a direct mechanical intervention by the brake pedal on a pressure-generating piston/cylinder unit takes place as fall-back option, considerable functional losses can be associated with this. The functional failure in an electrohydraulic brake module can also impair driving stability systems or render them inoperative. In general, the available installation space in motor vehicles is highly limited. Voluminous brake modules are therefore difficult to install in most cases.
What is needed is to improve the electrohydraulic brake module with regard to reliability and handling.
In accordance with a first aspect of the disclosure, an electrohydraulic brake module is provided for a motor vehicle brake system. A motor vehicle brake system of this type has a brake pedal, by way of which a brake request is transmitted to the electrohydraulic brake module by way of actuation. The transmission takes place by a mechanical connection which transmits a deflection of the brake pedal to the electrohydraulic brake module. Starting from the electrohydraulic brake module, a brake pressure distribution takes place in the motor vehicle brake system towards the wheel brakes.
The electrohydraulic brake module in accordance with a first aspect of the disclosure comprises a housing, a hydraulic module with a piston/cylinder arrangement for generating a hydraulic brake pressure, an electric motor for driving the piston/cylinder arrangement, a transmission arrangement for mechanically transmitting a brake pedal deflection, a pedal travel transducer arrangement which is coupled to the transmission arrangement and is guided or mounted in the housing, with a first mechanism element and a second mechanism element, a printed circuit board which is connected to the housing, with a sensor duster which has a pedal travel sensor arrangement.
The pedal travel transducer arrangement has a first pedal travel transducer. The pedal travel sensor arrangement has a first pedal travel sensor. The first pedal travel transducer and the first pedal travel sensor together form a first pedal travel detection unit which electronically detects the brake pedal deflection during operation. The pedal travel transducer arrangement has a second pedal travel transducer. The pedal travel sensor arrangement having a second pedal travel sensor. The second pedal travel transducer and the pedal travel sensor together form a second pedal travel detection unit which electronically detects the brake pedal deflection during operation in a redundant manner with respect to the first pedal travel detection unit. The first mechanism element establishes a force flow between the transmission arrangement and the housing in the case of a brake pedal actuation, and the second mechanism element establishes a force flow between the transmission arrangement and the housing in a redundant manner with respect to the first mechanism element in the case of a brake pedal actuation.
The piston/cylinder arrangement acts as a brake master cylinder, by which brake fluid is fed into a motor vehicle brake system during operation. In one exemplary arrangement, a corresponding piston dips into a cylinder bore which is made in the hydraulic module and forms a pressure space, and displaces brake fluid out of the precious space into the motor vehicle brake system during operation in the case of brake actuation. In one exemplary arrangement, the piston is driven by way of the electric motor via a rotation/translation gear mechanism. In terms of the operating principle, the rotation/translation gear mechanism is a nut/spindle mechanism and, in one exemplary arrangement, a ball screw drive. In one exemplary arrangement, the housing is connected fixedly to the hydraulic module.
A sensor cluster is to be understood to mean a spatially concentrated arrangement of a plurality of sensors. Sensor arrangements can have a sensor component such as, for example, conductor coils, semiconductors, electrodes together with application-specific integrated circuits (ASIC).
If it is stated that the first and/or the second mechanism element establish/establishes a force flow between the transmission arrangement and the housing in the case of a brake pedal actuation, this means that the mechanism elements are such, and are installed such, that they can transmit forces and/or movements. The respective force flow between the transmission arrangement and the housing does not have to be established here exclusively via the respective mechanism element alone. That is to say, further components can in each case also participate in the establishing of the respective force flow.
The first pedal travel detection unit is configured to fulfil its function during normal operation of the electrohydraulic brake module. This is the case when the corresponding components are functioning without disruptions. The first pedal travel detection unit is such that, in the case of a brake actuation, the first pedal travel transducer moves relative to the first pedal travel sensor. An application-specific integrated circuit which is contained in the sensor arrangement can assist the electronic detection of a relative movement of this type and therefore also the electronic detection of a brake pedal deflection.
The second pedal travel detection unit is configured to function in a redundant manner with respect to the first pedal travel detection unit. In the case of a functional failure of the first pedal travel detection unit, the second panel travel detection unit assumes the detection of the brake pedal deflection. The second pedal travel detection unit is such that, in the case of a brake actuation, the second pedal travel transducer moves relative to the second pedal travel sensor. An application-specific integrated circuit which is contained in the sensor arrangement can assist the electronic detection of a relative movement of this type and therefore also the electronic detection of a brake pedal deflection.
The second pedal travel detection unit ensures failsafe operation of the electrohydraulic brake module. In the case of a functional disruption in the first pedal travel detection unit, the second pedal travel detection unit can maintain the function of the electrohydraulic brake module without or, depending on the specific design, with low brake function impairment. In the case of a mechanical functional disruption which concerns the first mechanism element, the second mechanism element can likewise maintain the function of the electrohydraulic brake module. The electrohydraulic brake module is safeguarded in a redundant manner by way of this exemplary arrangement on an electrical level and on a mechanical level
The pedal travel transducer arrangement comprises a guide element which is coupled to the transmission arrangement and which is operatively connected to the first and the second mechanism element and establishes a force flow between the transmission arrangement and the housing.
In one exemplary arrangement, the guide element is guided such that it can be moved linearly in the housing, and it supports the first and the second pedal travel transducer. The transmission arrangement has a thrust rod which is guided such that it can be moved linearly, acts on the guide element with a thrust force in the case of a brake pedal actuation, and is connected via a connecting point to the guide element in such a way that a thrust movement of the thrust rod can be forwarded into a linear movement of the guide element. The first and the second mechanism element are in each case a spring which acts between the housing and the guide element with a restoring force which acts counter to the thrust force. In one exemplary arrangement, it is in each case a tension spring. The springs are arranged in each case in such a way that their lines of action run parallel to the linear movement direction of the guide element. The first spring is designed to reset the guide element. The second spring assists the resetting function. In the case of a failure of the first spring, example in the case of a spring fracture, the second spring fulfils the restoring function in a redundant manner and therefore improves the failed safety and reliability of the electrohydraulic brake module.
In one exemplary arrangement, the first spring, and in another exemplary arrangement, the first and the second spring, is/are prestressed in the rest position of the guide element.
The rest position of the guide element is that position, in which, during operation of the electrohydraulic brake module, the brake is not actuated by way of a brake pedal deflection, and therefore the guide element is also not deflected by way of a brake actuation. A possible play in the connecting point is eliminated by way of the prestressed, as a result of which a brake pedal deflection can be electronically detected exactly.
In one exemplary arrangement, the first and the second pedal travel detection unit have sensor technologies which differ from one another. As a result, the risk of mutual disruptive influences of the detection units in the sensor cluster is reduced. In the case of one possible diverse refinement, the first pedal travel detection unit is a pedal travel detection unit which detects in accordance with the inductive sensor principle, and the second pedal travel detection unit is a pedal travel detection unit which detects in accordance with the Hall sensor principle. The inductive sensor principle has a high interference immunity against external magnetic fields and provide safe redundancy together with the Hall sensor principle of the second pedal travel detection unit. In the case of a further possible diverse refinement, the first pedal travel detection unit is a pedal travel detection unit which detects in accordance with the Hall sensor principle, and the second pedal travel detection unit is a pedal travel detection unit which detects in accordance with the inductive sensor principle.
As an alternative to the use of differing sensor technologies, the first and the second pedal travel detection unit can also have sensor technologies which are homogeneous with respect to one another. In the case of one possible homogeneous refinement, the first and the second pedal travel detection unit are in each case a pedal travel detection unit which detects in accordance with the inductive sensor principle. In the case of a further homogeneous refinement, the first and the second pedal travel detection unit are in each case a pedal travel detection unit which detects in accordance with the Hall sensor principle.
In one alternative refinement to the exemplary arrangement with a guide element which can be moved in the housing linearly, the guide element is of annular configuration (also called a ring form variant in the following text) and is mounted rotatably in the housing. In one exemplary arrangement, the annular guide element has a gearwheel toothing system at least in sections. It is an external gearwheel toothing system. In this case, the transmission arrangement has a push/pull rod which is guided such that it can be moved linearly and acts alternately with a thrust and pulling force on the guide element in the case of a brake pedal actuation. This push/pull rod is connected via a connecting point to the annular guide element in such a way that a thrust movement of the push/pull rod is converted into a rotational movement of the guide element. The first and the second mechanism element are in each case of wheel-shaped configuration, with a gearwheel external toothing system, and are mounted in each case in a stationary and a rotatable manner in the housing, in one exemplary arrangement, in a stationary and a rotatable manner in the housing, such as with the aid of a cover element. The first and the second mechanism element are positioned next to one another in the housing in such a way that they in each case form a gear mechanism, for example a gearwheel mechanism, with the guide element of annular configuration and its gearwheel toothing system. The first mechanism element supports the first pedal travel transducer, and the second mechanism element supports the second pedal travel transducer.
An alternately acting thrust and pulling force is brought about during operation of the electrohydraulic brake module in the case of a brake actuation by way of a brake pedal deflection. A thrust force is brought about during pressing of a brake pedal, and a pulling force is brought about by way of releasing of the brake pedal. In the case of a functional disruption of the first mechanism element which may be a driven gearwheel here, the second mechanism element which likewise may be a driven gearwheel available in a redundant manner.
In the case of the ring form variant, the connecting point is such that, together with the push/pull rod, it forms a cross-slider crank mechanism. The crossslider crank mechanism is configured in such a way that the annular guide element has a slotted guide and the push/pull rod has a pin which is guided in the slotted guide. In the present case, the cross-slider crank mechanism operates in such a way that the push/pull rod drives the annular guide element. The pin can be configured, for example, as a pin which is fastened to the end of the push/pull rod. The annular guide element forms, as it were, a motion link with a slotted guide. This slotted guide can be configured as a slot. In the case of an actuation of the push/pull rod, driving of the annular guide element takes place via the pin which is guided in the slotted guide. This exemplary arrangement of the connecting point provides a reliably operating transmission of force and movement.
In the case of the ring form variant, the first and the second pedal travel detection unit are in each case a pedal travel detection unit which detects in accordance with the magneto-resistive sensor principle. The angular positions of the mechanism elements can be detected very precisely by way of this sensor principle, which leads to a reliable function of the electrohydraulic brake module.
In accordance with a second aspect of the disclosure, the electrohydraulic brake module comprises a housing, a hydraulic module with a piston/cylinder arrangement for generating a hydraulic brake pressure, an electric motor for driving the piston/cylinder arrangement, a transmission arrangement for mechanically transmitting a brake pedal deflection, a pedal travel transducer arrangement which is coupled to the transmission arrangement and is guided or mounted in the housing, with a first mechanism element and a second mechanism element, a printed circuit board which is connected to the housing, with a sensor cluster which has a pedal travel sensor arrangement. The pedal travel transducer arrangement has a pedal travel transducer and the pedal travel sensor arrangement has a first pedal travel sensor. The pedal travel transducer and the first pedal travel sensor together forming a first pedal travel detection unit which electronically detects the brake pedal deflection during operation. The pedal travel sensor arrangement has a second pedal travel sensor, the pedal travel transducer and the second pedal travel sensor together forming a second pedal travel detection unit which electronically detects the brake pedal deflection in a redundant manner with respect to the first pedal travel detection unit during operation. The first mechanism element establishes a force flow between the transmission arrangement and the housing in the case of a brake pedal actuation, and the second mechanism element establishes a force flow between the transmission arrangement and the housing in a redundant manner with respect to the first mechanism element in the case of a brake pedal actuation.
Since, in the case of this second aspect of the disclosure, the electrohydraulic brake module differs only slightly from that of the first aspect of the disclosure, reference is made to the above-described details and advantages of the electrohydraulic brake module according to the disclosure which also apply to the electrohydraulic brake module in accordance with the second aspect of the disclosure. By virtue of the fact that, in the case of the electrohydraulic brake module in accordance with the second aspect of the disclosure, only one pedal travel transducer is necessary, by way of which, however, there is nevertheless the electronic redundancy function together with the first and the second pedal travel sensor, cost advantages and a greater robustness as a result of fewer individual components result.
In the case of the second aspect of the disclosure, the pedal travel transducer arrangement comprises a guide element which is coupled to the transmission arrangement, and which is operatively connected to the first and the second mechanism element and establishes a force flow between the transmission arrangement and the housing.
In one exemplary refinement in the case of the second aspect of the disclosure, the guide element is guided in the housing such that it can be moved linearly, and it supports the pedal travel transducer. The transmission arrangement is a thrust rod which is guided such that it can be moved linearly, acts with a thrust force on the guide element in the case of a brake pedal actuation, and is connected via a connecting point to the guide element in such a way that a thrust movement of the thrust rod can be forwarded into a linear movement of the guide element. The first and the second mechanism element are in each case a spring which acts between the housing and the guide element with a restoring force which acts counter to the thrust force. In one exemplary arrangement, they are in each case a tension spring. The springs are arranged in each case in such a way that their lines of action run parallel to the linear movement direction of the guide element. The first spring is designed to reset the guide element. The second spring assists the resetting function. In the case of a failure of the first spring, for example in the case of a spring fracture, the second spring fulfils the resetting function in a redundant manner, and therefore improves the failsafe operation of the electrohydraulic brake module.
In the case of the second aspect of the disclosure, the first and the second pedal travel detection unit have sensor technologies which are homogeneous with respect to one another. It is possible that the first and the second pedal travel detection unit are in each case a pedal travel detection unit which detects in accordance with the inductive sensor principle. It is also possible that the first and the second pedal travel detection unit are in each case a pedal travel detection unit which detects in accordance with the Hall sensor principle and in the case of which the pedal travel transducer is a permanent bipolar magnet. As has already been mentioned, the use of homogeneous sensor technologies of this type has the effect of reducing the number of individual parts, as a result of which the electrohydraulic brake module becomes more robust. It is also possible that the first and the second pedal travel detection unit are in each case a pedal travel detection unit which detects in accordance with the Hall sensor principle and in the case of which the pedal travel transducer is a permanent multipolar magnet. This results in satisfactory travel resolution and therefore an exact detection of the brake pedal deflection, which improves the reliability of the electrohydraulic brake module.
Within the context of the second aspect of the disclosure with a homogeneous sensor technology in relation to the first and second pedal travel detection unit, the first and the second pedal travel detection unit can also in each case be a pedal travel detection unit which detects in accordance with the Hall sensor principle, and the pedal travel transducer can be a permanent bipolar magnet. Here, the first pedal travel sensor has two individual sensors which are arranged in a row in the movement direction of the pedal travel transducer arrangement, and it is possible for the first pedal travel sensor to detect a greater movement travel of the pedal travel transducer arrangement than the second pedal travel sensor. The individual sensors which are arranged in a row in the movement direction of the pedal travel transducer arrangement are advantageously arranged spaced apart from one another. As a result of the use of the two individual sensors which are arranged in a row, a greater movement travel of the pedal travel transducer can be detected, which leads to higher resolution of the pedal travel detection and therefore to a more reliable actuation of the electric motor and therefore to exact and reliable hydraulic brake pressure generation. In one exemplary arrangement, the first and the second pedal travel sensor can be arranged so as to follow one another in a row in the movement direction of the pedal travel transducer arrangement. The second pedal travel sensor is not divided into further individual sensors. The second pedal travel sensor is arranged so as to directly follow a first individual sensor of the first pedal travel sensor and so as to be spaced apart from a second individual sensor of the first pedal travel sensor. The arrangement in a row can also be in a sequence such that the second pedal travel sensor is arranged first in the thrust direction, immediately followed by a first individual sensor of the first pedal travel sensor and, spaced apart from the first individual sensor of the first pedal travel sensor, a second individual sensor of the first pedal travel sensor. The second pedal travel sensor as individual unit can therefore detect only a small movement travel of the pedal travel transducer than the first pedal travel sensor with its at least two individual sensors which are arranged in a row in the movement direction of the pedal travel transducer arrangement. Since the second pedal travel detection unit fulfils a redundancy function, this is possible. The controller of the electrohydraulic brake module is designed in such a way that, in the case of activation of the redundancy function in the case of this exemplary refinement with the different detection travel lengths of the movement travels of the pedal travel transducer, the actuation of the electric motor switches over in accordance with the shortened detection length by way of the second pedal travel detection unit, with the result that a brake actuation can nevertheless take place in a sufficient way. In the case of this refinement, the electronic redundancy function is ensured with an exemplary arrangement which is simultaneously less expensive but also more robust as a result of fewer components.
The refinements of the disclosure mentioned in the following text can be combined among one another and with all abovementioned aspects and possible or preferred refinements of the disclosure.
The electrohydraulic brake module has a rotor position transducer arrangement with a rotor position transducer, the sensor duster having a rotor position sensor arrangement with a rotor position sensor, and the rotor position transducer and the rotor position sensor together forming a rotor position detection unit which electronically detects the rotor position of the rotor of the electric motor during operation. The rotor position detection unit is a rotor position detection unit which detects in accordance with the inductive sensor principle. As an alternative, a rotor position detection unit can also be provided which operates in accordance with another sensor principle, for example a rotor position detection unit which operates in accordance with a magnetic sensor principle, for example, the magneto-resistive sensor principle.
In one exemplary refinement, the rotor position sensor arrangement is arranged on a first side of the printed circuit board, and the pedal travel sensor is arranged on a second side of the printed circuit board, which second side lies opposite the first side.
In one exemplary arrangement, the sensor cluster comprises a microswitch. In one exemplary arrangement, it is a microswitch with a switching lever or with a roller lever. As an alternative, the microswitch can be a reed switch or another switch which responds to a magnetic field. The microswitch or the stated types of microswitch is/are suitable for activating the electrohydraulic brake module and/or other systems in a vehicle from a system rest state and/or it or they is/are suitable for activating a vehicle brake light. The microswitch is arranged on the second side of the printed circuit board.
The combination of the various sensors in a sensor duster and also of the microswitch and likewise the stated arrangement of components on the first and second side of the printed circuit board result in installation space advantages and therefore in improved handling of the electrohydraulic brake module in the case of the design of a passenger car engine compartment or else an entire passenger car. The combination into a sensor duster also results in fewer connector interfaces, which leads to higher reliability.
The pedal travel transducer arrangement, for example the guide element, has a mechanical switching section or a magnet, in order for it to be possible for the microswitch to be switched in the case of a brake pedal actuation.
In one exemplary refinement, the electrohydraulic brake module, for example the printed circuit board, has an electronic interface for transmitting digital signals to an electronic control unit, such as to an electronic control unit for controlling the electric motor. An electronic interface of this type contributes to secure data transmission and therefore to the reliability of the electrohydraulic brake module. As a result, the electrohydraulic brake module is also of more compact design and has an improved handling capability.
Further features, advantages and possible applications of the present disclosure result from the following description of the exemplary arrangements and the diagrammatic figures. For the sake of clarity, all the illustrated elements in figure are not necessarily provided with a reference numeral. Corresponding elements or regions are then labelled at least in another figure, however, and the meaning can be gathered from there. Furthermore, identical reference numerals in the figures stand for identical or similar objects.
The rotor position sensor arrangement 61 is arranged on the first side 41 of the printed circuit board 40, and the pedal travel sensor arrangement 51 is arranged on the second side 42 of the printed circuit board 40. The rotor position sensor arrangement 61 has a rotor position sensor 62. The rotor position sensor 62 and the rotor position transducer 64 together form a rotor position detection unit 65 which operates in accordance with the inductive sensor principle. The rotor position sensor 62 correspondingly has transmitting and receiving coils. An integrated circuit belonging to the rotor position sensor 62 is contained on the printed circuit board 40.
The pedal travel sensor arrangement 51 has a first pedal travel sensor 52 and a second pedal travel sensor 55. The first pedal travel sensor 52 and the first pedal travel transducer 72 together form a first pedal travel detection unit 53 which operates in accordance with the inductive principle. The first pedal travel sensor 52 accordingly has transmitting and receiving coils. An integrated circuit belonging to the pedal travel sensor 52 is contained on the printed circuit board 40. The second pedal travel sensor 55 and the second pedal travel transducer 75 together form a second pedal travel detection unit 56 which operates in accordance with the Hall principle. The second pedal travel sensor 55 accordingly has an electrode arrangement for utilizing the Hall effect. An integrated circuit belonging to the pedal travel sensor 55 is contained on the printed circuit board 40. In this case, the pedal travel sensor 55 is formed by way of a plurality of (at least two) individual sensors 54, in order to detect a displacement of the second pedal travel transducer 75.
The second pedal travel detection unit 56 forms a unit, redundant with respect to the first pedal travel detection unit 53, for the detection of a pedal deflection. Therefore, the brake module 1 operates reliably even if the first pedal travel detection unit 53 should fail during operation. The brake module 1 can also be designed in such a way that the first pedal travel detection unit 53 operates in accordance with the Hall principle and the second pedal travel detection unit 56 operates in accordance with the inductive principle. In this case, the pedal travel detection unit which operates in accordance with the inductive principle would be the redundant unit.
Furthermore, the printed circuit board 40 has a microswitch with a roller lever 67, by way of which, for example, a brake light of an associated vehicle can be activated and deactivated, or one or more systems, for example, the electronic controller of the brake module 1, can be activated from a rest state. The connectors 48 in
The second pedal travel detection unit 56 forms a unit, redundant with respect to the first pedal travel detection unit 53, for the detection of a pedal deflection. Therefore, the brake module 1 operates reliably even if the first pedal travel detection unit 53 should fail during operation. The brake module 1 can also be designed in such a way that the first pedal travel detection unit 53 is the redundant unit.
The first and the second pedal travel sensor 52, 55 are arranged on the printed circuit board 40 next to one another and at a spacing from one another in such a way that they can detect a rotation of the gear wheels 80′, 85′ or the pedal travel transducers 72, 75. That is to say, the first gearwheel 80′ is arranged together with the first pedal travel transducer 72 in such a way that its rotation can be detected by way of the first pedal travel sensor 52, and the second gearwheel 85′ is arranged together with the second pedal travel transducer 75 in such a way that its rotation can be detected by way of the second pedal travel sensor 55.
The first and the second pedal travel sensor 52, 55 are arranged next to one another, for example orientated at a spacing from one another in each case along parallel to the linear movement direction L of the guide element 90, with the result that they can detect a linear movement of the guide element 90 or of the pedal travel transducer 172. Correspondingly, the pedal travel transducer 172 is arranged in such a way that it moves along the first pedal travel sensor 52 and the second pedal travel sensor 55 in the case of a linear movement of the guide element 90. The pedal travel transducer 172 is correspondingly so wide that it covers the two pedal travel sensors 52, 55.
In the case of the two variants
In the case of the variant
The first pedal travel sensor 52 and the pedal travel transducer 172 together form a first pedal travel detection unit 153 which operates in accordance with the Hall principle. The first pedal travel sensor 52, that is to say the individual sensors 54.1 and 54.2, accordingly has in each case an electrode arrangement for utilizing the Hall effect. An integrated circuit belonging to the pedal travel sensor 52 is contained on the printed circuit board 40.
The second pedal travel sensor 55 and the pedal travel transducer 172 together form a second pedal travel detection unit 156 which operates in accordance with the Hall effect. The second pedal travel sensor 55 accordingly has an electrode arrangement for utilizing the Hall effect. An integrated circuit belonging to the pedal travel sensor 55 is contained on the printed circuit board 40. The second pedal travel detection unit 156 forms a unit, redundant with respect to the first pedal travel detection unit 153, for the detection of a pedal deflection. Therefore, the brake module 1 operates reliably even if the first pedal travel detection unit 153 should fail during operation. A greater detection travel results for the first pedal travel detection unit 153 as a result of the two individual sensors 54.1 and 54.2 which are spaced apart from one another than in the case of the second redundant pedal travel detection unit 156. The detection travel of the first pedal travel detection unit 153 depicts a great brake pedal deflection and ensure satisfactory handling of the brake module 1, since the brakes can be actuated in a finely metered manner by way of a great brake pedal travel. The redundant pedal travel detection unit 156 forms a smaller detection travel which is sufficient as redundancy function, however. The number of parts is reduced by way of the restriction to a second sensor which is not formed from a plurality of individual sensors, which has a favourable effect on production costs and handling capability.
In the case of the variant
| Number | Date | Country | Kind |
|---|---|---|---|
| 102021214570.1 | Dec 2021 | DE | national |
