Fluid-pressure and analogous brake systems – Speed-controlled – Pressure reapply control
Patent
1995-09-12
1996-10-01
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Pressure reapply control
303156, B60T 800
Patent
active
055606911
ABSTRACT:
In the disclosed method and apparatus, the brake fluid pressure in a wheel cylinder is reduced and thereafter it is re-increased so that the braking torque is linearly increased with respect to time due to the anti-skid control and the rate of change of the coefficient of road surface friction with respect to the wheel slip rate is determined while the brake fluid pressure is thus re-increased so that the brake fluid pressure is re-relieved when said rate of change comes below a predetermined threshold. The method of invention calculates the rate of change by achieving, when there is no pulsatory change in the wheel speed during the re-increase of the brake fluid pressure the steps of: obtaining the wheel speed at the point of time which is the midpoint of first and second points of time giving the same wheel speed, subtracting from this wheel speed at the midpoint the wheel speed at the first point of time or at the second point of time, increasing by four times the result of subtraction and dividing this increased result by the time period between the first and second points of time, obtaining a reciprocal of the result of the division, subtracting from this reciprocal, a reciprocal of the wheel acceleration at the first point of time, multiplying the result of the subtraction with the vehicle speed and a value which is attained by dividing the rate of increase of the braking torque at the midpoint by the product of the wheel load and the effective wheel radius, and then increasing the result of the multiplication by three times.
REFERENCES:
patent: 3888550 (1975-06-01), Reinecke et al.
patent: 4033634 (1977-07-01), Arai et al.
patent: 5071200 (1991-12-01), McNinch, Jr.
Kitano Yutaka
Sakuma Masaru
Takayama Toshio
Oberleitner Robert J.
Poon Peter M.
Tokico Ltd.
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