Method and device for treating suspected errors

• US 20040090323A1
• Filed: 12/16/2003
• Published: 05/13/2004
• Est. Priority Date: 11/09/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Bieringer, Mathias, Ortlinghaus, Dirk, Landesfeind, Klaus
• Granted Patent: US 7,058,489 B2
• Time in Patent Office: Days
• US Class Current: 340/444
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 17/22 Devices for monitoring or checking brake systems; Signal devices
• CPC Class Codes: B60T 2270/413 Plausibility monitoring, cross check, redundancy
• CPC Class Codes: B60T 8/885 using electrical circuitry

Abstract

A method and a device for producing an error signal and carrying out measures based thereon in a motor vehicle equipped with a wheel-slip control system and/or a wheel deceleration control system. At least one function variable representing the functionality of the wheel-slip control system and/or wheel-deceleration control system is monitored here for an error and if at least one error is detected, the value of at least one error counter is incremented. Likewise when there is at least one detected error, at least one error signal is output when the value of at least one error counter exceeds a predeterminable limiting value. For at least one error counter, at least two different, predeterminable limiting values coexist simultaneously, and when each of these is exceeded by the counter reading of the at least one error counter, different error signals are output, and in response to the different error signals, different measures are carried out in the wheel-slip control system and/or wheel deceleration control system.

Claims

1. A method for producing an error signal and carrying out measures based thereon in a motor vehicle equipped with a wheel-slip control system and/or a wheel deceleration control system, which

monitors for an error at least one function variable representing the functionality of the wheel-slip control system and/or wheel deceleration control system, and

increments the value of at least one error counter (ik) if at least one error is detected, and

outputs at least one error signal when the value of at least one error counter exceeds a predeterminable limiting value (N1, N2, N3),

wherein

for at least one error counter, at least two different, predeterminable limiting values (N1, N2, N3) coexist simultaneously, and when each of these is exceeded by the counter reading of the at least one error counter (ik), different error signals are output, and

in response to the different error signals, different measures are carried out in the wheel-slip control system and/or wheel deceleration control system.

2. The method as recited in claim 1,

wherein the wheel-slip control system and/or wheel deceleration control system is a vehicle dynamics control system, which regulates at least one variable representing the vehicle dynamics toward a desired behavior.

3. The method as recited in claim 1,

wherein the monitoring of at least one function variable representing the functionality of the wheel-slip control system and/or the wheel deceleration control system takes place such that a verification of the fulfillment of at least one given condition takes place.

4. The method as recited in claim 1,

wherein a slowing down of the braking force buildup procedure and/or braking force reduction procedure is performed in the wheel brakes as the first measure when the lowest limiting value (N1) is exceeded by one error counter.

5. The method as recited in claim 4,

wherein as a second measure when the second lowest limiting value (N2) is exceeded by one error counter, a greater deviation of at least one variable representing the vehicle dynamics from its desired behavior is permitted before a control intervention of the vehicle dynamics control system takes place, and/or as a second measure at least one control intervention of the vehicle dynamics control system is completely prohibited.

6. The method as recited in claim 3,

wherein the monitoring of at least one function variable takes place such that a variable represented by the output signal of a vehicle sensor is compared with a variable calculated through a mathematical model.

7. The method as recited in claim 6,

wherein a variable represented by the output signal of a vehicle sensor is compared only during certain driving states to a variable calculated through a mathematical model.

8. The method as recited in claim 1,

wherein a function variable is understood as the voltage at one point of the electronic circuit of the wheel-slip control system and/or wheel deceleration control system or the output signal of a sensor or a variable calculated from a mathematical model.

9. A device for producing an error signal and carrying out measures based thereon in a motor vehicle equipped with a wheel-slip control system and/or wheel deceleration control system, which has

monitoring means that monitor for an error at least one function variable representing the functionality of the wheel-slip control system and/or wheel-deceleration control system, and

error counting means, in which the value of at least one error counter (ik) is incremented if at least one error is detected, and

error signal producing means, through which at least one error signal is output when the value of at least one error counter exceeds a predeterminable limiting value (N1, N2, N3),

wherein

for at least one error counter, at least two different, predeterminable limiting values (N1, N2, N3) coexist simultaneously, and when each of these is exceeded by the counter reading (ik) of the at least one error counter, different error signals are output, and

in response to the different error signals, different measures are carried out in the wheel-slip control system and/or wheel deceleration control system.