Anti-lock brake control system for motor vehicle with facility for discriminating vibrations of driving wheels thereof
First Claim
1. A method of determining discriminatively vibration of a driving wheel of a motor vehicle equipped with an engine and an anti-lock brake control system whether said vibration of the driving wheel is due to a judder phenomenon or brought about by rough-road condition, comprising the steps of:
- a) detecting a rotation speed of said driving wheel;
b) detecting wheel vibration state on the basis of variation in said rotation speed of said driving wheel;
c) detecting a torsion torque applied to a driving shaft serving as a torque transmitting member for coupling operatively said engine and said driving wheel to each other;
d) detecting vibration state of said torsion torque; and
e) deciding discriminatively whether the vibration of said driving wheel as detected is brought about;
by said judder phenomenon or alternatively by said rough-road condition, on the basis of a relation between said wheel vibration state and said torsion torque vibration state.
1 Assignment
0 Petitions
Accused Products
Abstract
An anti-lock brake control system for motor vehicle which can determine vibrations of wheel speed brought about by rough-road condition and judder phenomenon by detecting a torque applied to a driving shaft of the motor vehicle in association with driving wheels without need for estimating a coefficient of friction of a road surface, to thereby improve and enhance the performance of the anti-lock brake control for the motor vehicle. Whether vibration of the driving wheel is brought about by a judder phenomenon or by a rough-road condition is decided on the basis of predetermined relations between the vibration state of the driving wheel and that of the torsion torque applied to the driving shaft.
31 Citations
5 Claims
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1. A method of determining discriminatively vibration of a driving wheel of a motor vehicle equipped with an engine and an anti-lock brake control system whether said vibration of the driving wheel is due to a judder phenomenon or brought about by rough-road condition, comprising the steps of:
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a) detecting a rotation speed of said driving wheel; b) detecting wheel vibration state on the basis of variation in said rotation speed of said driving wheel; c) detecting a torsion torque applied to a driving shaft serving as a torque transmitting member for coupling operatively said engine and said driving wheel to each other; d) detecting vibration state of said torsion torque; and e) deciding discriminatively whether the vibration of said driving wheel as detected is brought about;
by said judder phenomenon or alternatively by said rough-road condition, on the basis of a relation between said wheel vibration state and said torsion torque vibration state. - View Dependent Claims (2, 3, 4, 5)
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Specification