Method of and apparatus for vehicle traction control by detecting wheel spin
First Claim
1. An apparatus for detecting wheel spin for a vehicle having a front left wheel, a front right wheel, a rear left wheel and a rear right wheel, said apparatus comprising a first difference forming means for forming a first difference between a speed of the front left wheel and a speed of the rear right wheel, a second difference forming means for forming a second difference between a speed of the front right wheel and a speed of the rear left wheel, and comparison means for comparing at least one of the first and second differences with a detection threshold representing a maximum desirable wheel spin value.
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Accused Products
Abstract
A first difference is formed between the speeds of a front left wheel and a rear right wheel. A second difference is formed between the speeds of a front right wheel and a rear left wheel. The higher of the differences is compared with a threshold from a spin threshold generator to provide an indication of wheel spin, which may be used in a traction controller or in an antilock brake system.
36 Citations
20 Claims
- 1. An apparatus for detecting wheel spin for a vehicle having a front left wheel, a front right wheel, a rear left wheel and a rear right wheel, said apparatus comprising a first difference forming means for forming a first difference between a speed of the front left wheel and a speed of the rear right wheel, a second difference forming means for forming a second difference between a speed of the front right wheel and a speed of the rear left wheel, and comparison means for comparing at least one of the first and second differences with a detection threshold representing a maximum desirable wheel spin value.
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7. A traction control apparatus comprising:
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an apparatus for detecting wheel spin for a vehicle having an engine, a front left wheel, a front right wheel, a rear left wheel and a rear right wheel; and drive reducing means for reducing an output demand of the engine, said apparatus for detecting wheel spin comprising a first difference forming means for forming a first difference between a speed of the front left wheel and a speed of the rear right wheel, a second difference forming means for forming a second difference between a speed of the front right wheel and a speed of the rear left wheel, and comparison means for comparing at least one of the first and second differences with a detection threshold representing a maximum desirable wheel spin value, said drive reducing means being arranged to be responsive to said first comparison means for reducing the engine output demand when that least one of the first and second differences is greater than the detection threshold. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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- 18. A method of detecting wheel spin in a vehicle having a front left wheel, a front right wheel, a rear left wheel and a rear right wheel, comprising forming a first difference between a speed of the front left wheel and a speed of the rear right wheel, forming a second difference between a speed of the front right wheel and the rear left wheel and comparing at least one of said first and second differences with a detection threshold representing a maximum desirable wheel spin value.
Specification