Automotive system for dynamically determining road adhesion
First Claim
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1. A system for determining the road adhesion of a tire installed on a road wheel of an automotive vehicle operating on a roadway, comprising;
- road wheel turn angle measuring means comprising means for producing a first signal representing the turn angle at which the steering system of said vehicle is being operated;
vehicle speed measuring means comprising means for producing a second signal representing the speed at which said vehicle is being operated;
steering force measuring means comprising means for producing a third signal representing the steering force required to operate the steering system of said vehicle at said measured road wheel turn angle and said measured vehicle speed; and
processor means for determining the road adhesion of said tire, with said processor means comprising means for receiving said first, second, and third signals and means for deriving from said signals a fourth signal representing the magnitude of said road adhesion.
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Abstract
A system for determinng the road adhesion of a tire installed on a road wheel of an automotive vehicle operating on a roadway includes a road wheel turn angle measuring device, a vehicle speed measuring mechanism and a steering force measuring mechanism. Information regarding turn angle, vehicle speed and steering force are fed into a processor which determines the road adhesion of the tire.
85 Citations
17 Claims
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1. A system for determining the road adhesion of a tire installed on a road wheel of an automotive vehicle operating on a roadway, comprising;
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road wheel turn angle measuring means comprising means for producing a first signal representing the turn angle at which the steering system of said vehicle is being operated; vehicle speed measuring means comprising means for producing a second signal representing the speed at which said vehicle is being operated; steering force measuring means comprising means for producing a third signal representing the steering force required to operate the steering system of said vehicle at said measured road wheel turn angle and said measured vehicle speed; and processor means for determining the road adhesion of said tire, with said processor means comprising means for receiving said first, second, and third signals and means for deriving from said signals a fourth signal representing the magnitude of said road adhesion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An emergency operating system for determining the road adhesion of a tire installed on a road wheel of an automotive vehicle operating on a roadway, comprising:
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road wheel turn angle measuring means comprising means for producing a first signal representing the turn angle at which the steering system of said vehicle is being operated; vehicle speed measuring means comprising means for producing a second signal representing the speed at which said vehicle is being operated; steering force measuring means comprising means for producing a third signal representing the steering force required to operate the steering system of said vehicle at said measured road wheel turn angle and said measured vehicle speed; and Processor means for determining the road adhesion of said tire, with said processor means comprising means for receiving said first, second, and third signals and means for deriving from said signals a fourth signal in the event that the magnitude of said road adhesion is less than a threshold value; and emergency control means responsive to said fourth signal for operating an emergency control system. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification