Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Patent
1996-02-12
1998-02-03
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
B60T 878
Patent
active
057136432
DESCRIPTION:
BRIEF SUMMARY
This application is the U.S. national-phase application of PCT International Application No. PCT/EP94/02274.
BACKGROUND OF THE INVENTION
The present invention relates to a control circuit for use with an automotive vehicle motion control system such as an anti-lock control (ABS) for an automotive vehicle brake system and/or traction slip control (TCS). Included in the present invention is a single-chip microcontroller for evaluating and processing data obtained by sensors and representative of the rotational behavior of the individual vehicle wheels, and for generating braking pressure control signals which are delivered to electrically commutable hydraulic valves inserted into the pressure fluid conduits of the brake system, and/or for generating engine torque control signals. The microcontroller is constantly checked on each activation, or as a function of other periodic events, and cyclically repeated during operation, by way of tests, self-tests, a signature analysis of the read-only memories and/or according to other per se known methods of error detection. The present invention also includes a monitoring circuit which deactivates or disconnects the control partially or entirely in the case of an interference.
A control circuit of this type is disclosed in European patent application No. 0 357 922. This publication describes a method of operating a service brake device for a commercial vehicle and an electronic control device for implementing the method. To evaluate and process the data obtained by sensors, a high-integration single-chip microcontroller is used which also comprises pulse-width modulators to generate the valve control signals. An integral component part of the microprocessor is a ROM-programmed test module performing a cyclically repeated self-test which includes all important functions and operations of the microcontroller. Further, the control device has a monitoring circuit which resets the microcontroller to an initialization condition in the case of defined malfunctions.
German patent No. 32 34 637 discloses a control circuit for an ABS system wherein the signals emitted by wheel sensors are processed in two independent, parallel, identically designed and identically programmed microcontrollers. The output signals of both microcontrollers are checked for coincidence. If there are differences, the control is deactivated or disconnected, thereby preserving the operability of the brake system, though without control. Thus, the known control circuit is based on a redundant signal processing in two complete circuits. The sole purpose of the redundancy is to reliably detect malfunctions and to disconnect the control upon malfunction. The disconnecting mechanisms also have a largely redundant design for the same reason.
There is no need for detailed explanations that the redundant signal processing by way of parallel operated, complete microcontrollers requires complicated structure.
In another known circuit arrangement of this type which is described in German patent application No. 41 37 124, the sensor signals or input signals are conducted in parallel to two circuits. Only one of the two circuits, however, performs the entire complicated signal processing operation. Monitoring is the main purpose of the second circuit. Therefore, the input signals are processed further after conditioning and forming of derivatives by way of simplified control algorithms and a simplified control philosophy. The simplified processing operation is sufficient to generate signals which permit concluding proper operation by comparison with the signals processed in the more sophisticated microcontroller.
The signal processing operation effected by this known circuit is also redundant to a large extent, though with restrictions. Apart from the sophisticated microcontroller for the actual signal processing, there is need for a second integrated circuit for the still complex, though simplified reproduction of the control algorithms.
SUMMARY OF THE INVENTION
A general object of the present invention is to
REFERENCES:
patent: 4113321 (1978-09-01), Bleckmann
patent: 4360918 (1982-11-01), Ruhnau
patent: 4546437 (1985-10-01), Bleckmann et al.
patent: 4916698 (1990-04-01), McCann
patent: 4959836 (1990-09-01), Berard
patent: 4995042 (1991-02-01), Guthaus
patent: 5404304 (1995-04-01), Wise
patent: 5411324 (1995-05-01), Zydek et al.
Stocker, Von Ulrich; Bonisch, Gunther, Zuverlassigkeit von elektronischen Bauteilen im Automobil, ATZ Automobiltechnische Zeitschrift 93 (1991), No. 7/8, Jul., Aug., Stuttgart, Germany.
English translation entitled Circuit Configuration for a Brake System with Anti-Lock Control and/or Traction Slip Control (labeled PCT7255) corresponding to DE 4137124, listed above.
German Search Report.
International Search Report.
Esselbrugge Hermann
Kant Bernhard
Kranz Thomas
Bartz C. T.
ITT Automotive Europe GmbH
Lewis J. Gordon
Oberleitner Robert J.
Twomey Thomas N.
LandOfFree
Control circuit for automotive vehicle motion control systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control circuit for automotive vehicle motion control systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuit for automotive vehicle motion control systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-656576