Method and device for controlling wheel brakes

• US 20020050739A1
• Filed: 07/23/2001
• Published: 05/02/2002
• Est. Priority Date: 07/26/2000
• Status: Abandoned Application

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Weiberle, Reinhard, Koepff, Georg, Kesch, Bernd
• Application Number:
  US09/912,666
• Publication Number:
  US 20020050739A1
• Time in Patent Office: Days
• US Class Current: 303/122.09
• CPC Class Codes: B60T 13/686 in hydraulic systems or parts thereof
• CPC Class Codes: B60T 13/745 acting on a hydraulic system, e.g. a master cylinder
• CPC Class Codes: B60T 17/221 Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M
• CPC Class Codes: B60T 8/326 Hydraulic systems
• CPC Class Codes: B60T 8/348 4 Channel systems B60T8/345 takes precedence
• CPC Class Codes: B60T 8/3655 Continuously controlled electromagnetic valves
• CPC Class Codes: B60T 8/4013 Fluid pressurising means for more than one fluid circuit, e.g. separate pump units used for hydraulic booster and anti-lock braking
• CPC Class Codes: B60T 8/5012 Pressure reapplication using a plurality of valves in parallel
• CPC Class Codes: B60T 8/94 on a fluid pressure regulator

Abstract

A method and a device for controlling wheel brakes is proposed. To improve the availability and to fulfill legal requirements imposed on an electrical braking system, a control of the valves derived from a second power circuit independent of the first one is provided in the event of a fault, via which the braking pressure in the at least one wheel brake can be set even in the event of a fault.

Claims

1. A method for controlling wheel brakes in an electrical braking system of a motor vehicle, comprising the steps of:

generating control driving signals for valve arrangements for a control of a braking pressure in a first group of the wheel brakes from a first power circuit and for a control of a braking pressure in a second group of the wheel brakes from a second power circuit that is independent of the first group of the wheel brakes; and

detecting a first fault in an area of at least one of the valve arrangements, a pressure supply, and an electrical system of the electrical braking system, wherein;

when a second fault affects those of the wheel brakes supplied by the first power circuit, the control driving signals for one of the valve arrangements are generated, a power for an activation of the one of the valve arrangements originating from the second power circuit.

3. The method according to claim 1, wherein:

when a fault condition occurs, the control driving signals are generated to actuate at least one of additional valve arrangements and existing valve arrangements via a redundant electrical control on the basis of the power of the second power circuit.

4. The method according to claim 1, wherein:

in a fault condition of one of the wheel brakes, a speed of the motor vehicle is limited.

6. The method according to claim 1, wherein:

in a fault condition in an area of a front axle brake actuator, a braking pressure control occurs in front ones of the wheel brakes according to control driving signals generated from a control module assigned to one of rear ones of the wheel brakes.

8. The method according to claim 1, wherein:

when a fault condition occurs, control driving signals of a control module of those of the wheel brakes corresponding to rear axle brakes are generated to activate additional valve arrangements via which a braking pressure in those of the wheel brakes corresponding to front wheel brakes is set.

2. A method for controlling wheel brakes in an electrical braking system of a motor vehicle, comprising the steps of:

generating control driving signals for valve arrangements for a control of a braking pressure in one of the wheel brakes from a first power circuit, a braking pressure being provided by at least one of an accumulator and a pump; and

detecting a first fault in an area of at least one of the valve arrangements, a pressure supply, and an electrical system of the electrical braking system, wherein;

when a second fault occurs in one of an accumulator circuit, a pump circuit, and the first power circuit, a valve is activated at a brake actuator of a front one of the wheel brakes, the valve isolating the pump circuit from the accumulator circuit.

5. The method according to claim 2, wherein:

in a fault condition of one of the wheel brakes, a speed of the motor vehicle is limited.

7. The method according to claim 2, wherein:

in a fault condition in an area of a front axle brake actuator, a braking pressure control occurs in front ones of the wheel brakes according to control driving signals generated from a control module assigned to one of rear ones of the wheel brakes.

9. A computer program for causing a computing unit of a control unit to perform the steps of:

generating control driving signals for valve arrangements for a control of a braking pressure in a first group of wheel brakes from a first power circuit and for a control of a braking pressure in a second group of the wheel brakes from a second power circuit that is independent of the first group of the wheel brakes; and

detecting a first fault in an area of at least one of the valve arrangements, a pressure supply, and an electrical system of an electrical braking system, wherein;

when a second fault affects those of the wheel brakes supplied by the first power circuit, the control driving signals for one of the valve arrangements are generated, a power for an activation of the one of the valve arrangements originating from the second power circuit.