Regulation of driving dynamics, featuring advanced build-up of pressure at the wheel to be regulated
First Claim
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1. A method for stabilizing a vehicle in a critical driving situation, comprising:
- detecting the critical driving situation by a sensor system;
causing a regulating algorithm to intervene in a driving operation of the vehicle under a predefined condition using a brake system;
determining and monitoring a lateral acceleration of the vehicle and a steering speed in relation to threshold values; and
before a stabilization intervention, building up a preparatory brake pressure of a low level at a wheel brake of a wheel at which the stabilization intervention is shortly expected;
wherein the preparatory brake pressure is built up if the lateral acceleration of the vehicle exceeds a first predefined threshold value and the steering speed falls below a second predefined threshold value.
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Abstract
A method for improving the efficiency of a driving dynamics regulating system which intervenes in the driving operation in critical driving situations by automatic braking intervention at selected wheels. It is possible for the reaction speed of the brake system 3 to be considerably increased if, before the actual regulating intervention, the imminent critical driving situation is already detected and a slight preparatory brake pressure is already built up at least one wheel at which a future regulating intervention is expected.
12 Citations
12 Claims
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1. A method for stabilizing a vehicle in a critical driving situation, comprising:
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detecting the critical driving situation by a sensor system; causing a regulating algorithm to intervene in a driving operation of the vehicle under a predefined condition using a brake system; determining and monitoring a lateral acceleration of the vehicle and a steering speed in relation to threshold values; and before a stabilization intervention, building up a preparatory brake pressure of a low level at a wheel brake of a wheel at which the stabilization intervention is shortly expected; wherein the preparatory brake pressure is built up if the lateral acceleration of the vehicle exceeds a first predefined threshold value and the steering speed falls below a second predefined threshold value. - View Dependent Claims (2, 3, 4, 5)
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6. A method for stabilizing a vehicle in a critical driving situation, comprising
detecting the critical driving situation by a sensor system; -
causing a regulating algorithm to intervene in a driving operation of the vehicle under a predefined condition using a brake system; before a stabilization intervention, building up a preparatory brake pressure of a low level at a wheel brake of a wheel at which the stabilization intervention is shortly expected; and deactivating the building up the preparatory brake pressure if a predefined deactivation condition is met; wherein the deactivation condition is a signal of the regulating algorithm with which a braking intervention is requested and that a change in a steering angle over a predefined time is smaller than a predefined threshold value.
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7. A driving dynamics regulating system for stabilizing a vehicle in a critical driving situation, comprising:
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a sensor system for registering variables describing a driving condition; a brake system for performing a stabilization intervention in a driving operation of the vehicle under a predefined condition, in accordance with a regulating algorithm; and a control unit configured to execute the regulating algorithm to; determine and monitor a lateral acceleration of the vehicle and a steering speed in relation to threshold values; and before the stabilization intervention, build up a preparatory brake pressure of a low level at a wheel brake of a wheel at which the stabilization intervention is shortly expected; wherein the preparatory brake pressure is built up if the lateral acceleration of the vehicle exceeds a first predefined threshold value and the steering speed falls below a second predefined threshold value. - View Dependent Claims (8, 9, 10, 11)
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12. A driving dynamics regulating system for stabilizing a vehicle in a critical driving situation, comprising:
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a sensor system for registering variables describing a driving condition; a brake system for performing a stabilization intervention in a driving operation of the vehicle under a predefined condition, in accordance with a regulating algorithm; and a control unit configured to execute the regulating algorithm to; before the stabilization intervention, build up a preparatory brake pressure of a low level at a wheel brake of a wheel at which the stabilization intervention is shortly expected; and deactivate the build up the preparatory brake pressure if a predefined deactivation condition is met; wherein the deactivation condition is a signal of the regulating algorithm with which a braking intervention is requested and that a change in a steering angle over a predefined time is smaller than a predefined threshold value.
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Specification