Patent Application
20090276139
The present invention relates to an engine control system having a control unit and a monitoring module and to a method for qualifying the components of the system.
Engine control systems are generally known. In this regard, reference is made thereto.
Engine control systems assume the task of controlling the operating parameters of the engine and of protecting the same from damage. Depending on the location of use, comprehensive qualification testing of the engine control system is required, including at least a test for electromagnetic compatibility and a vibration test.
Engine control systems include a control unit and a monitoring module, it being possible for the control unit itself to include a first and a second controller. This redundant design enhances operational reliability.
When working with such a system, there is always the need for the complete system to undergo qualification testing. It turns out, however, that, depending on the location of use, it is often the case that the same control unit, but different monitoring modules are required. Therefore, each individual monitoring module requires a relatively costly and time-consuming qualification procedure for the complete system.
For that reason, one approach has already provided for implementing the control unit and the monitoring module as separate devices, so that, should the monitoring module change, it is merely necessary for the separate monitoring module to undergo qualification testing.
However, separating the monitoring module from the control unit entails higher costs, as well as a heavier weight and a higher volume of the overall unit. Also, each modification to the monitoring module version necessitates performing at least the vibration test once again.
An object of the present invention is to devise an improved engine control system that will be able to overcome these problems. It is intended, moreover, to devise a suitable qualification method.
In terms of the engine control system, this objective is achieved by the features set forth in claim 1 and, in terms of a monitoring module for the engine control system, by the features set forth in claim 7. A suitable qualification method is indicated in claim 17. Moreover, for this system, respectively this method, a suitable dummy monitoring system as set forth in claim 8, and a dummy control unit as set forth in claim 12 are provided.
Advantageous embodiments of the present invention are delineated in the dependent claims.
The engine control system according to claim 1 includes a control unit and a monitoring module, which, together with the control unit, forms one structural unit and is designed as a detachable module having an independent electromagnetic shielding. This makes it possible for the monitoring module to be modified as a function of the particular application, without having to requalify the complete system.
In the case of the engine control system according to claim 2, the monitoring module and the control unit are interconnected via a communication interface which includes a galvanic separation.
This makes it possible for communication signals to be transmitted without potential errors, and for the transmission of electromagnetic interference signals from the monitoring unit to the control unit to be effectively prevented.
In the case of the engine control system according to claim 3, the monitoring module and the control unit are interconnected via an analog interface which advantageously has a bidirectional design. A supplementary device made up of passive electrical circuit elements effectively prevents the transmission of electromagnetic interference signals from the monitoring unit to the control unit.
In the case of the engine control system according to claim 4, the monitoring module is supplied with current from the control unit via a current interface, this power supply advantageously being designed to be short-circuit and no-load proof. A supplementary device made up of passive electrical circuit elements effectively prevents the transmission of electromagnetic interference signals from the monitoring unit to the control unit.
In the case of the engine control system according to claim 5, the monitoring module is electrically and mechanically connected via a plug connector device to the control unit.
In the case of the engine control system according to claim 6, the control unit has a first controller and a second controller, the first controller having a first communication interface, a first analog interface and a first current interface, and the second controller having a second communication interface, a second analog interface and a second current interface.
The monitoring module according to claim 7 includes a substantially closed housing for attenuating electromagnetic waves and a plug connector device for connection to a control unit.
The dummy monitoring module provided for connection to a control unit for an engine control system according to claim 8 has the same housing and the same plug connector device as a functional monitoring module.
In the case of the dummy monitoring module according to claim 9, a resistor, which simulates the power consumption of the functional monitoring module, is provided for a first and second current interface, respectively.
In the case of the dummy monitoring module according to claim 10, a first communication interface for a first controller is connected through to a second communication interface for a second controller.
In the case of the dummy monitoring module according to claim 11, a first analog interface for a first controller of the control unit is connected via a first test circuit to a second analog interface for a second controller of the control unit.
The dummy control unit provided for connection to a monitoring module for an engine control system according to claim 12 has the same housing and the same plug connector device as a functional control unit.
In the case of the dummy control unit according to claim 13, a current source is provided which supplies the monitoring module with current via the first current interface and the second current interface.
In the case of the dummy control unit according to claim 14, a first communication interface for a first controller device is connected through to a second communication interface for a second controller.
In the case of the dummy control unit according to claim 15, an analog interface for a first controller is connected via a second test circuit to a second analog interface for a second controller.
In the case of the dummy control unit according to claim 16, to determine the minimum attenuation using measurement processes, the first analog interface, the second analog interface, the first communication interface, the second communication interface, the first current interface and the second current interface are interconnected.
In the method for qualifying the individual components of an engine control system according to claim 17, the components, for which qualification testing is not actively pending, are replaced by dummy components for qualification purposes.
In the method according to claim 18, the dummy components simulate those functions of the components they have replaced which are required for the particular qualification.
The present invention is described in greater detail in the following with reference to the figures.
In the figures, 1a and 1b denote a first, respectively a second current interface; 1c the power consolidation in the monitoring module; 2a and 2b a first, respectively a second communication interface; and 3a and 3b a first, respectively a second analog interface. In addition, reference numerals 5 and 6 denote a first and a second controller, which, together, constitute control unit 5, 6; reference numeral 7 denotes a monitoring module; and reference numeral 4 an electromechanical separation between control unit 5, 6 and monitoring module 7. Moreover, reference numerals 12a and 12b denote a first and second plug connector device, respectively; reference numerals 14 and 15 the housing of control unit 5, 6, respectively of monitoring module 7; reference numeral 16 a resistor; and reference numerals 17 and 19 a first and a second test circuit. Finally, reference numeral 18 also denotes a current source; 20 a dummy monitoring module; and 21a dummy control unit.
In
The control unit and the monitoring module may be electromechanically separated from one another.
The mechanical connection is accomplished using screws (not shown).
The electrical separation is carried out via plug connector device 12a and 12b, which is apparent from
First plug connector device 12a contacts first controller 5 via monitoring module 7, whereas second plug connector device 12b contacts second controller 6 via monitoring module 7. In this context, first plug connector device 12a implements first current interface 1a, first communication interface 2a and first analog interface 3a, whereas second plug connector device 12b implements second current interface 1b, second communication interface 2b and second analog interface 3b.
Current interfaces 1a, 1b supply power from first and second controller 5 and 6, respectively, to the monitoring module. Power is consolidated in the monitoring module. The power supply in first and second controller 5 and 6, respectively, or the power consolidation in the monitoring module is designed to be short-circuit and no-load proof. In the process, emissions are blocked by filters, for example. This interface is realized by passive, components and without logic modules.
Both first communication interface 2a, as well as second communication interface 2b maintain galvanic separation of control unit 5, 6 from the monitoring module. Here as well, emissions are blocked through the use of filters, for example. The communication interface is implemented by passive components without the use of logic modules.
The analog interfaces are used for rapidly exchanging predefined operating parameters, such as vibration and speed signals, for example, between monitoring module 7 and control unit 5, 6. These interfaces also have filters for purposes of blocking emissions and are implemented without logic modules and with passive components.
To simulate the power consolidation function, for each controller 5, 6, dummy monitoring module 20 has a separate resistor which simulates the consumption characteristics of the functional monitoring module. Moreover, for test purposes, communication interface 2a is connected through to communication interface 2b.
In
In
In this context, in
In
To determine the transfer function between dummy control unit 21 and monitoring module 7, in the case of dummy control unit 21 according to
As shown in
In the assembled state, the housing is completely closed off from electromagnetic radiation. In the disassembled state, this is not necessarily the case.
The present invention was described above with reference to the use of a control unit having a first and second controller. However, the number of controllers is not limited to two. The present invention may likewise be implemented using a control unit having one or three or more controllers.
The present invention was described above with reference to the use of three separate interfaces, namely a current interface, a communication interface and an analog interface. However, it is not limited to such a number of interfaces. Rather, the number of interfaces is in accordance with the function of the monitoring module. The same holds for the number of plug connector devices.
| Number | Date | Country | Kind |
|---|---|---|---|
| DE 102008021825.1 | Apr 2008 | DE | national |
