This application claims priority from German patent application serial no. 10 2008 038 808.4 filed Aug. 13, 2008.
The invention refers to a foot pedal module.
Known as state of the art is, for instance, a configuration as described in DE 10 2005 061 277 A1, which is the basis of this invention. It describes a vehicle's accelerator pedal, comprising the following components:
In addition, an accelerator pedal configuration for vehicles is known through DE 20 2004 004 454 U1. It is particularly designated for passenger automobiles and comprises:
Also, known through DE 20 2004 004 457 U1 is an additional accelerator pedal configuration for vehicles. The configuration comprises at least one sensor and one accelerator module, which is incorporates at least one accelerator pedal. By means of the accelerator pedal, a resonant circuit is altered between an actuation position and a non-actuation position in a way so that a corresponding signal is generated. The resonant circuit comprises at least one capacitor and at least one inductor which are shifted by means of the sensor's coil circuitry, comprising at least three coils.
Known from DE 102 55 712 A1 is an additional accelerator pedal construction for a vehicle. It comprises a contactless linear sensor, which incorporates a cursor part and a stator part. The linear sensor is being linked in a way to an accelerator pedal lever, so that the cursor part is coupled, free of play, to the accelerator pedal lever by means of a tappet.
At last, as described in DE 101 33 194 A1, an accelerator pedal construction to adjust the vehicle's driving speed is known, comprising
The purpose of this invention is the development of a foot pedal module, which is also based on inductive sensor technique and which, under simple manufacturing conditions, can transfer precisely the foot pedal's angular position.
Different from the state of the art, the perimeter area of the lever part or the rotor is not being used, but instead the rotor's front face, to attach the coupling part or the activator part. Thus, the geometric form of the activator parts, also avoiding a delicate dependence on distance issues, are much more easily matched to the shape of the inductor arrays. The category defining state of the art in DE 10 2005 061 277 A1 describes the difficulties as follows: “The coil circuitry, in accordance with the coupling part's described arch-shaped path, can exhibit a warping. Preferred, however, is a straight level coil circuitry, for instance, like a conventional circuit board. In this case, the manufacturing is more cost effective. Fact is that there exists a variable distance of the coupling part above the coil circuitry, due to the arch-shaped path. Any arising measuring errors, however, can be avoided by using in this case a heavy-duty, inductive sensor, as, for instance, described in WO-A-03/038379. Also, potential measuring error can be avoided through appropriate calibration.”
The invention does not use any of these three options (arch-shaped inductor sensor, robust flat sensor, calibrated flat sensor), but a flat activator part, opposite to a flat circuit board, as an inductor carrier. Hereby, the difficulties of manufacturing the arch-shapes as well as the measuring errors can be avoided.
The invention is described based on
The foot pedal module 1 is protected by the enclosure 3, having an inserted or integrated trunnion 5. On this trunnion, which is firmly connected to the enclosure, a bushing 7 is positioned, which is slipped over the trunnion 5 during the assembly. The bushing 7 comprises (i) a tappet, designed as a driving element 27, for directing the rotor 11, also (ii) a lever 13, through which the distance to be measured, is being precisely transferred from a foot pedal 15 to the rotor 11.
Hence, the bushing 7 is driven by the foot pedal 15. The driver generates during the acceleration a certain compressive force on the foot pedal 15. This force will be passed on through a ball joint 35 (details in
As shown in
The named haptic springs 17, 19 are doubled, for reasons of a reliable redundancy. They define the mechanical resistance which is experienced by the driver when operating the foot pedal 15, meaning that they provide haptic feedback.
The construction of the springs 17, 19 is designed for an equal distribution of the force, approx. 50:50. In case one spring 17, 19 should break, the driver will recognize a loss of force, signaling to the driver that one spring 17, 19 does not function anymore, but the system itself is still working properly.
In case of a deviation from the force's ratio of 50:50, for example at an assumed ratio of 20:80, the driver will most likely notice a force reduction in case the stronger spring would fail, but an non-experienced driver or student driver would not notice a failure of the weaker spring, because the reduction of the force is as little as 20%. For that reason, the force ratio of 50:50 is selected for the two springs 17, 19.
The electric signal conversion takes place based on inductive mode, through the movement of two damping elements 21, 23 (see
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