Method of improving the control behavior of a braking system
First Claim
1. A method of improving the control behavior of an electronically controlled brake system, wherein the rotational behavior of individual vehicle wheels is measured and evaluated for determining a vehicle reference speed, wheel slip, wheel deceleration and acceleration, and, if required, other control quantities,wheel slip threshold values being predefined for the commencement of a control,the wheel slip threshold being increased for a predetermined time interval as a function of the wheel acceleration after preceding instability of the respective wheel,the wheel slip threshold rise being effected when predetermined limit values of wheel acceleration are exceededwherein several acceleration limit values of a different magnitude are predefined, and wherein the wheel slip threshold is stepwise increased as a function of the excess of the acceleration limit values.
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Abstract
A method of improving the control behavior of a controlled brake system, wherein the rotational behavior of the individual vehicle wheels is measured and evaluated for determining control quantities, and wherein slip threshold values for the commencement of the control are predetermined, includes that the slip threshold of a wheel is increased for a predefined time interval as a function of the acceleration after preceding instability in order to suppress the effects of road surface irregularities. This increase may be carried out in two steps as a function of the exceeded acceleration limit values.
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Citations
6 Claims
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1. A method of improving the control behavior of an electronically controlled brake system, wherein the rotational behavior of individual vehicle wheels is measured and evaluated for determining a vehicle reference speed, wheel slip, wheel deceleration and acceleration, and, if required, other control quantities,
wheel slip threshold values being predefined for the commencement of a control, the wheel slip threshold being increased for a predetermined time interval as a function of the wheel acceleration after preceding instability of the respective wheel, the wheel slip threshold rise being effected when predetermined limit values of wheel acceleration are exceeded wherein several acceleration limit values of a different magnitude are predefined, and wherein the wheel slip threshold is stepwise increased as a function of the excess of the acceleration limit values.
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4. A method of improving the control behavior of an electronically controlled brake system, wherein the rotational behavior of individual vehicle wheels is measured and evaluated for determining a vehicle reference speed, wheel slip, wheel deceleration and acceleration, and, if required, other control quantities,
wheel slip threshold values being predefined for the commencement of a control, the wheel slip threshold being increased for a predetermined time interval as a function of the wheel acceleration after preceding instability of the respective wheel, the wheel slip threshold rise being effected when predetermined limit values of wheel acceleration are exceeded, wherein the slip threshold, which was increased due to an excess of the predetermined acceleration limit value, is reset as soon as the acceleration of the wheel falls below a predetermined resetting threshold upon expiry of the predetermined time interval.
Specification