Anti-block control system test

Details Anti-block control system test Anti-block control system test

1983-02-22

1985-01-15

Myracle, Jerry W.

Measuring and testing

Brake testing

303 92, 340 52B, G01L 528

Patent

active

044932103

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a vehicle wheel anti-block control system in which the wheels of a vehicle are separately monitored.


BACKGROUND

Four identically designed control channels, comprising sensors, an evaluation circuit and a brake control unit, for the various wheel brakes are provided as well as safety circuits and devices for testing the operability of the anti-block control system at timed intervals in a test cycle. An identical test signal is fed from the test device into all the channels, and the effects of these test signals are compared by the safety circuit and the test device at predetermined, corresponding locations in the channels, specifically in pairs, with respect to an at least approximate agreement in terms of the time of occurrence and/or the value of the occurring signal; a switching and/or warning signal is generated whenever the compared signals deviate from one another by a predetermined value, which may also be zero.
In German Patent Disclosure Document DE-OS No. 26 14 016, to which U.S. Pat. No. 4,085,979 corresponds, a two-channel anti-block controller is described in which a test signal is fed into the channels from time to time, particularly at a standstill, and the resultant signals are compared at different, corresponding positions in the channels. As disclosed, the safety circuit thus includes timing elements and comparison elements. If the signals do not agree, a warning and/or switching signal is generated. A safety circuit containing timing elements is also provided for both channels, and it can be monitored separately; the time constants of the timing elements are shortened as needed.
With respect to a two-channel anti-block controller, it is also known, from German Examined Application DE-AS No. 27 01 159, to which British Pat. No. 1,596,191 corresponds, to dispense with a safety circuit having timing elements, and to feed a test signal into the channels at predetermined intervals even while driving. Two test circuits are provided, in which the signals resulting at various positions of the two channels are compared; if they do not agree, the warning and/or switching signal is generated. As a result, a defect is recognized even if one test circuit should fail.


THE INVENTION

It is an object to provide a wheel anti-block controller having four control channels with a safety and test device which permits redundant monitoring of the system, wherein test signals need not be fed during driving, and which is attained at relatively little expense.
Briefly, a separate, individual safety circuit is provided for each pair of channels; each one of these individual safety circuits includes timing elements which monitor the response times of the respective circuits upon supply thereto of a test signal. The individual safety circuits are connected to the pair of brake control circuits. Additionally, the safety circuits are connected to a comparator, each, which monitors the concurrence or coincidence of the signal trains which occur in each one of the pairs of channels during the test cycle, to evaluate the signals with respect to their temporal occurrence, to the value of the signal which, typically, is a digital signal, or both; and which generate an output signal if there should be non-concurrence, indicative of a warning to an operator of the motor vehicle that the circuits are not functioning properly, which output signal can additionally be used to disable the anti-brake lock circuit, or to carry out other switching functions.
In the invention, the safety circuit having timing elements and comparator elements is retained, and the principle described in German Patent Disclosure Document DE-OS 26 14 016 (U.S. Pat. No. 4,085,979) is advantageously applied to a four-channel controller. Despite the four channels, only two safety circuits are required, and they monitor the channels redundantly. According to an embodiment of the invention, the same monitoring circuit which compares the control signals also is used in the test cycle to compare the signals generated in the safety c

REFERENCES:
patent: 4092853 (1978-06-01), Schneider et al.
patent: 4192180 (1980-03-01), Gerstenmeier et al.

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