System for detecting hydroplaning of vehicle
First Claim
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1. A hydroplaning condition detecting system for a vehicle comprising:
- an undriven wheel speed sensor for sensing rotation of an undriven wheel of the vehicle and producing an undriven wheel speed signal representing a sensed undriven wheel speed;
a filtering means for generating a signal representing a filtered undriven wheel speed by subjecting said undriven wheel speed signal to an action of a low-pass filter with a predetermined cutoff frequency; and
a condition detecting means for determining a difference resulting from subtraction from said filtered undriven wheel speed of said sensed undriven wheel speed, and generating a hydroplaning detection signal indicative of occurrence of a hydroplaning condition when said difference is equal to or greater than a predetermined value.
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Abstract
A control system, such as a traction control system, for a wheel vehicle comprises a detecting section for detecting a hydroplaning condition by comparing a difference between a sensed undriven wheel speed, and a filter signal obtained by passing the sensed undriven wheel speed signal through a low-pass filter, and a controlling section for performing a control action adapted to the hydroplaning condition. This control system can detect the hydroplaning condition accurately, and control the vehicle adequately to negotiate the hydroplaning condition.
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Citations
21 Claims
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1. A hydroplaning condition detecting system for a vehicle comprising:
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an undriven wheel speed sensor for sensing rotation of an undriven wheel of the vehicle and producing an undriven wheel speed signal representing a sensed undriven wheel speed; a filtering means for generating a signal representing a filtered undriven wheel speed by subjecting said undriven wheel speed signal to an action of a low-pass filter with a predetermined cutoff frequency; and a condition detecting means for determining a difference resulting from subtraction from said filtered undriven wheel speed of said sensed undriven wheel speed, and generating a hydroplaning detection signal indicative of occurrence of a hydroplaning condition when said difference is equal to or greater than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification