Process for determining the wheel slip of individual wheels of a vehicle
First Claim
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1. Process for determining wheel slip σ
- of at least one wheel of a vehicle, said at least one wheel having injective characteristics of braking force coefficient μ
versus wheel slip σ
which each have a maximum and which vary as a function of the grip between said at least one wheel and the road surface, said process comprising the steps of;
detecting brake application;
generating at least an activating signal in response to said brake application when said vehicle is in a stable braking range;
intermittently removing and reapplying braking force with respect to said at least one wheel during generation of said activating signal, by means of at least one pressure reducing component associated therewith, whereby wheel speed of said at least one wheel during removal of braking force substantially equals that of a corresponding free running wheel;
measuring wheel speed of said at least one wheel with braking force applied, during generation of said activating signal;
measuring wheel speed of the same said at least one wheel with braking force removed, during generation of said activating signal; and
comparing said wheel speed of said at least one wheel with braking fore applied, with the wheel speed of the same said at least one wheel with braking force removed.
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Abstract
A process for determining the wheel slip of individual wheels of a vehicle by time sequentially measuring the speeds of a particular wheel without braking force applied and with braking force applied.
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Citations
27 Claims
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1. Process for determining wheel slip σ
- of at least one wheel of a vehicle, said at least one wheel having injective characteristics of braking force coefficient μ
versus wheel slip σ
which each have a maximum and which vary as a function of the grip between said at least one wheel and the road surface, said process comprising the steps of;detecting brake application; generating at least an activating signal in response to said brake application when said vehicle is in a stable braking range; intermittently removing and reapplying braking force with respect to said at least one wheel during generation of said activating signal, by means of at least one pressure reducing component associated therewith, whereby wheel speed of said at least one wheel during removal of braking force substantially equals that of a corresponding free running wheel; measuring wheel speed of said at least one wheel with braking force applied, during generation of said activating signal; measuring wheel speed of the same said at least one wheel with braking force removed, during generation of said activating signal; and comparing said wheel speed of said at least one wheel with braking fore applied, with the wheel speed of the same said at least one wheel with braking force removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18)
- of at least one wheel of a vehicle, said at least one wheel having injective characteristics of braking force coefficient μ
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17. In a braking arrangement for a vehicle having at least one rotatable supporting wheel, a device for measuring wheel slip comprising:
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means for intermittently removing and reapplying braking force with respect to said rotatable wheel during a braking application when said vehicle is in a stable braking range; means for measuring speed of said rotatable wheel with braking force applied; means for measuring speed of said rotatable wheel without braking force applied; and means for comparing the measured speed of said wheel with braking force applied and without braking force applied.
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19. Process for measuring the wheel slip of individual wheels of a vehicle during the application of braking force to one or more of said wheels, comprising the steps of
a. separately measuring the speed of each of said braked wheels with braking force applied thereto; -
b. interrupting the application of braking force to each of said braked wheels; c. separately measuring the speed of each of said braked wheels during the interruption of braking force thereto; d. comparing separately with respect to each of said braked wheels, the measured speed thereof with braking force applied and with braking force interrupted.
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20. In a braking arrangement for a vehicle having at least one rotatable supporting wheel, a device comprising:
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braking means for applying braking force to each wheel of said vehicle; interrupting means for intermittently interrupting the braking force applied to each of said wheels; measuring means for measuring separately for each wheel the speed of said wheel with braking force applied and with braking force interrupted; and means for comparing, separately for each wheel, the measured speed of said wheel with braking force applied and with braking force interrupted;
thereby enabling precise determination of wheel slip at each wheel, independently of the others. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification