Method and apparatus for controlling differentially driven wheel slip
First Claim
1. In an anti-slip apparatus for balancing the power transfer between a pair of driven wheels (200,202) when one of the wheels loses traction and rotates faster than the other, said apparatus having first means (212,214) for braking the wheels and second means (216, 222, 220) for generating a slip signal corresponding to any difference in the rotational speeds between the wheels (200, 202), the improvement comprising:
- third means (230,232,
242) for actuating the first means (212,
214) on the faster rotating wheel (200,
202) to a degree which is variably incrementally modulated in proportion to the difference in rotational speeds between the wheels (200,
202) in response to the slip signal.
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Accused Products
Abstract
A slip control system for vehicles having spaced apart differentially driven wheels (200,202) including means (220) for calculating wheel slip according to the ratio of wheel speeds, means (242,230,232) for entering a slip control mode wherein a braking force is applied to the slipping wheel and incrementally varied on a periodic review basis according to recalculated slip values. If slip increases or holds steady, the brake force is incrementally increased. As slip becomes less, the brake force is incrementally reduced, the particular increments of force reduction being selected in accordance with successive measurements of slip. A drive shaft signal (226) is compared to the high wheel speed signal to identify a wheel speed transducer failure.
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Citations
11 Claims
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1. In an anti-slip apparatus for balancing the power transfer between a pair of driven wheels (200,202) when one of the wheels loses traction and rotates faster than the other, said apparatus having first means (212,214) for braking the wheels and second means (216, 222, 220) for generating a slip signal corresponding to any difference in the rotational speeds between the wheels (200, 202), the improvement comprising:
third means (230,232,
242) for actuating the first means (212,
214) on the faster rotating wheel (200,
202) to a degree which is variably incrementally modulated in proportion to the difference in rotational speeds between the wheels (200,
202) in response to the slip signal.- View Dependent Claims (2, 3)
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4. In a system for balancing the power transfer between two differentially driven vehicle wheels (200, 202) when one of said wheels loses traction, said system being of the type which includes means (216, 222) for generating a slip signal representing the speed difference between the wheels and means (212, 214) for applying a braking force to the wheel which loses traction the improvement comprising:
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means (244) defining a plurality of slip signal value bands each having defined slip value limits, means (242) repeatedly comparing said slip signal to said bands, and means (232) variably incrementally changing the braking force according to the slip signal value band to which said slip value corresponds. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for balancing the power transfer between two differentially driven vehicle wheels (200, 202) when one of said wheels loses traction comprising the steps of:
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developing a slip signal representing the difference between the rotational speeds of the differentially driven wheels, applying a brake force to said one wheel to control slip; defining a plurality of slip signal value bands having defined end values; repeatedly periodically determining the relationship between the slip signal value and each of said bands, and incrementally varying the braking force in accordance with an incremental variation value which corresponds to the band within which said slip signal value falls. - View Dependent Claims (11)
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Specification