Warning system distinguishing wheel skidding and wheel slipping
First Claim
1. A warning system for alerting a vehicle driver to different types of traction losses comprising:
- a first sensing circuit for detecting a loss of adhesion by a vehicle wheel with respect to a relatively moving traction surface;
a second sensing circuit for detecting application of a vehicle brake;
a logic circuit for combining sensor signals from said first and second sensing circuits and for producing a first command signal indicative of the detection of both the loss of adhesion by said vehicle wheel and the application of said vehicle brake and a second command signal indicative of the detection of the loss of adhesion by said vehicle wheel but not the application of the vehicle brake;
a first indicator responsive to the first command signal of said logic circuit for alerting the vehicle driver to wheel skidding; and
a second indicator responsive to the second command signal of said logic circuit for alerting the vehicle driver to wheel slipping.
1 Assignment
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Accused Products
Abstract
A warning system alerts a driver of a motor vehicle to different types of traction losses. A first sensing circuit (10) detects a loss of wheel adhesion by monitoring a vehicle drive line for a pronounced vibration within a range of between ten and fifteen hertz. A second sensing circuit (12) monitors a brake light circuit to detect application of a vehicle brake. A logic circuit (28) combines outputs (A and B) from the first and second sensing circuits and outputs command signals (C and D) that distinguish between a loss of wheel adhesion due to wheel skidding and a loss of wheel adhesion due to wheel slipping. A warning device includes two indicators (36 and 38) that receive the respective command signals and produce sensorially distinguishable warning signals for eliciting different responses from the driver.
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Citations
27 Claims
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1. A warning system for alerting a vehicle driver to different types of traction losses comprising:
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a first sensing circuit for detecting a loss of adhesion by a vehicle wheel with respect to a relatively moving traction surface; a second sensing circuit for detecting application of a vehicle brake; a logic circuit for combining sensor signals from said first and second sensing circuits and for producing a first command signal indicative of the detection of both the loss of adhesion by said vehicle wheel and the application of said vehicle brake and a second command signal indicative of the detection of the loss of adhesion by said vehicle wheel but not the application of the vehicle brake; a first indicator responsive to the first command signal of said logic circuit for alerting the vehicle driver to wheel skidding; and a second indicator responsive to the second command signal of said logic circuit for alerting the vehicle driver to wheel slipping. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for warning a vehicle driver of both wheel skidding and wheel slipping comprising:
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a first sensing circuit for detecting a pronounced vibration induced by a vehicle wheel having lost adhesion with respect to a relatively moving traction surface; a second sensing circuit for detecting application of a vehicle brake; a logic circuit combining outputs of said first and second sensing circuits for distinguishing between a loss of wheel adhesion due to wheel skidding and a loss of wheel adhesion due to wheel slipping; and a warning device for producing sensorially distinguishable warning signals for eliciting different responses from the vehicle driver in response to the detection of wheel skidding and wheel slipping. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of alerting a vehicle driver to different types of traction losses comprising the steps of:
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sensing vehicle operating conditions with a first sensing circuit for detecting a loss of adhesion by a vehicle wheel with respect to a relatively moving traction surface; sensing vehicle operating conditions with a second sensing circuit for detecting application of a vehicle brake; combining outputs of said first and second sensing circuits in a logic circuit for distinguishing between a loss of wheel adhesion due to wheel skidding and a loss of wheel adhesion due to wheel slipping; and producing sensorially distinguishable warning signals for eliciting different responses from the vehicle driver to the detection of wheel skidding and wheel slipping. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification