Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1998-02-20
1999-08-24
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
701 71, 701 78, 701 82, 180197, G06F 770
Patent
active
059419245
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and device for controlling a vehicle braking system.
BACKGROUND INFORMATION
A method and a device of this kind are disclosed by PCT International Publication No. WO-A1 83/03230. The braking regulator it describes comprises controlling the slip at each of the vehicle's wheels to a predefined value during a braking operation. A controller controls the pressure in a pneumatic or hydraulic braking system at the individual wheel brakes in such a way that the slip at all the wheels assumes the predefined value. The slip regulation aids in achieving uniform tire and brake wear.
A similar effect is achieved by regulating all wheels to the same brake wear. In this connection, for a pressure-regulated braking system, the German 33 13 078 C2 discloses using wear sensors to detect brake wear and to reduce or hold back the brake pressure at those wheel brakes where a heavier wear occurs.
What is desirable in connection with brake system controls is the knowledge of the momentary wheel contact patch forces (wheel loads). When the wheel contact patch forces are known, the control of the braking system, in particular control functions, such as anti-lock control, operating dynamics control, traction control or chassis control, can be adapted to the current vehicle load.
The related art referred to above provides for sensors to detect the wheel's contact patch forces. Such sensors represent substantial additional outlay.
It is the object of the present invention to specify measures for determining wheel contact patch forces, which will eliminate the need for additional sensory mechanisms.
SUMMARY OF THE INVENTION
The present invention provides a cost-effective way of determining the wheel contact patch forces or the relative wheel loads. These values are used advantageously in the control of the braking system.
The present invention also advantageously achieves a uniform distribution of the braking forces over all the wheels, with the largest possible braking factor, given a good directional stability and uniform tire and brake wear.
It is especially advantageous that the data determined in the case of brakes with electromotive actuation be retrieved to ascertain any braking variations occurring during vehicle operation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a block diagram of a method for controlling a vehicle braking system according to an embodiment of the present invention.
FIG. 2 illustrates a block diagram of closed loop control of a vehicle braking system according to an embodiment of the present invention.
FIG. 3 illustrates a flow chart for a computer program, according to an embodiment of the present invention, which implements a method for determining the relative wheel contact patch forces.
FIG. 4 illustrates a flow chart for a computer program, according to an embodiment of the present invention, which implements a method for determining the plausibility of the detected relative wheel contact patch forces.
DETAILED DESCRIPTION
FIG. 1 depicts an electronic control unit 10, which, by way of output lines 12, 14, 16 and 18, actuates the wheel brakes of a dual-axle vehicle. In the preferred exemplary embodiment, an electromotive brake controller is used, which is sketched in FIG. 1 based on the example of a wheel brake.
The output line leads in each case--via an output stage (not shown)--to an electromotor 20, which is coupled via a mechanical connection 22 to brake calipers 24 of wheel 26. Provision is also made in the vicinity of brake controller 28 for a measuring device 30 for detecting the exerted brake force. A line 32 leads from measuring device 30 back to control unit 10. In a comparable manner, lines 34, 36 and 38 lead from the other wheel brakes to control unit 10. To determine the braking force, the preferred exemplary embodiment provides for using strain gauges for detecting the force exerted by the electromotor on the brake calipers. In one preferred exemplary embodiment, one draws alternatively or additionally
REFERENCES:
patent: 5090318 (1992-02-01), Schenk et al.
patent: 5312170 (1994-05-01), Erban et al.
patent: 5732377 (1998-03-01), Eckert
patent: 5742507 (1998-04-01), Eckert
patent: 5774821 (1998-06-01), Eckert
Arthur Gertrude
Cuchlinski Jr. William A.
Robert & Bosch GmbH
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