Circuit for the shutdown of an anti-lockup protected vehicle brake unit in case of disturbance
First Claim
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1. A circuit for detecting a malfunction in a wheel anti-lockup protected vehicle brake system so as to effect a shutdown of said system including:
- (a) at least one rotation sensor device to monitor the rotational behavior of at least one said wheel of said vehicle;
(b) wheel velocity generator means to which said sensor device is connected for providing a wheel speed signal corresponding to the rotational velocity of said wheel;
(c) reference velocity generator means to which said wheel speed signal is connected for providing a reference speed signal representative of the speed of said vehicle;
(d) means subject to said wheel speed signal and said vehicle velocity signal for providing a wheel slip signal when the wheel rotational speed is less than the vehicle speed;
(e) a logic circuit to which said wheel slip signal is connected in conjunction with a wheel deceleration signal and a wheel acceleration signal for evaluation in terms of determining the condition of rotation of said wheel;
wherein the improvement comprises;
(f) means for comparing said wheel speed signal with a predetermined threshold value; and
(g) means for providing a shutdown signal to terminate operation of said wheel anti-lockup brake system in the event of a malfunction thereof, as indicated by said wheel speed signal being less than said threshold value concurrently with the presence of said wheel slip signal for a predetermined period of time.
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Abstract
An improved vehicle wheel anti-lockup brake control system in which a shutdown signal is generated to disable the wheel anti-lockup control system in the event of a malfunction, as determined by the concurrent presence of a wheel slip signal and a low wheel speed signal (generated by the same wheel) for a predetermined period of time sufficient to allow a normally operative anti-lockup control system to correct a slipping wheel before it locks up.
10 Citations
4 Claims
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1. A circuit for detecting a malfunction in a wheel anti-lockup protected vehicle brake system so as to effect a shutdown of said system including:
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(a) at least one rotation sensor device to monitor the rotational behavior of at least one said wheel of said vehicle; (b) wheel velocity generator means to which said sensor device is connected for providing a wheel speed signal corresponding to the rotational velocity of said wheel; (c) reference velocity generator means to which said wheel speed signal is connected for providing a reference speed signal representative of the speed of said vehicle; (d) means subject to said wheel speed signal and said vehicle velocity signal for providing a wheel slip signal when the wheel rotational speed is less than the vehicle speed; (e) a logic circuit to which said wheel slip signal is connected in conjunction with a wheel deceleration signal and a wheel acceleration signal for evaluation in terms of determining the condition of rotation of said wheel;
wherein the improvement comprises;(f) means for comparing said wheel speed signal with a predetermined threshold value; and (g) means for providing a shutdown signal to terminate operation of said wheel anti-lockup brake system in the event of a malfunction thereof, as indicated by said wheel speed signal being less than said threshold value concurrently with the presence of said wheel slip signal for a predetermined period of time. - View Dependent Claims (2, 3, 4)
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Specification