Process and device for dealing with errors in electronic control

Details Process and device for dealing with errors in electronic control Process and device for dealing with errors in electronic control

1994-07-25

1995-08-08

Teska, Kevin J.

Boots, shoes, and leggings

36442403, 36457101, 303122, 180 791, G06F 1100, G05B 903, B62D 714

Patent

active

054404878

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention proceeds from a process and an apparatus for error control or error recovery in electronic control devices according to the generic part of the main claim. A process and an apparatus for error recovery in an electronic control device is already known from DE 38 25 280 A1. The control device is provided, e.g., for controlling rear axle steering in a motor vehicle. Two emergency running measures are provided in the event of an error. For a relatively grave error, one emergency running measure consists in that the rear wheels are maintained in the last adjusted position, i.e. that position adjusted immediately prior to the occurrence of the error. The emergency running measure for a relatively minor error consists in returning the deflected rear wheels to the neutral or zero position in a purposeful manner and at final speed.


ADVANTAGES OF THE INVENTION

The process, according to the invention, with the characterizing features of the main claim has the advantage over the prior art that in the event of a relatively minor error an emergency program is started in which regulating variables or actuating values continue to be calculated for the actuating member as in the main program. These actuating values are multiplied by a factor which decreases over time from the moment the emergency program begins to run, resulting in a gradual fading or damping of the actuating amplitude of the actuating member. A smooth transition is effected from a deflected state of the actuating member to the neutral position of the actuating member. In this way, when a relatively minor error occurs, the control of the actuating member can be cut off gently without a drastic change in the control response. As concerns the control of rear wheel steering of a motor vehicle in particular, the gentle disengagement of rear wheel steering in an emergency situation is safer, since the driving behavior of the vehicle does not change abruptly.
Advantageous further developments and improvements of the process indicated in the main claim are made possible by the steps contained in the subclaims. To check for consistency of the detected transmitter signals, it is particularly advantageous to check the detected transmitter signals against predetermined values to determine whether or not a permissible signal range has been exceeded and/or to compare the detected transmitter signals with the detected transmitter signals of the redundant transmitter which is provided in addition. Accordingly, in many cases the defective transmitter can be definitely identified and the appropriate emergency measure can then be instituted.
Further, it is advantageous for checking the consistency of the detected transmitter signals to compare the rate of change of the detected transmitter signals with predetermined values as a function of predetermined quantities. This step enables early detection of an error so that the appropriate emergency measure can be implemented more promptly.
For checking the consistency of the detected transmitter signals, it is also advantageous to compare the detected transmitter signals with values derived from detected transmitter signals of transmitters supplying equivalent information. This enables more reliable detection of an error for a transmitter for which there is no redundant transmitter.
Further, it is advantageous for consistency checks to compare the number of detected errors with predetermined values and to include different errors in the same count when these errors are attributed to an identical source and to run one of the emergency programs only when the number of detected errors has reached a predetermined value. Running an emergency program only after repeated errors are detected prevents superfluous running of an emergency program due to a temporary disturbance, e.g. EMC disturbance. By counting together different errors attributed to the same cause, the emergency measure can be carried out faster than when errors are evaluated as different, independent errors.
The activation of the safety device

REFERENCES:
patent: 4032757 (1977-06-01), Eccles
patent: 4546437 (1985-10-01), Bleckmann et al.
patent: 4621327 (1986-11-01), Dolph et al.
patent: 4687214 (1987-08-01), Uno
patent: 4782907 (1988-11-01), Morishita et al.
patent: 4953445 (1990-09-01), Kervagoret et al.

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