Fluid-pressure and analogous brake systems – Motorman's valves
Patent
1989-01-17
1989-10-24
Kashnikow, Andres
Fluid-pressure and analogous brake systems
Motorman's valves
303114, 303 93, 303 20, 303101, 188356, 91391A, B60T 1504, B60T 886, F15B 1310
Patent
active
048757403
ABSTRACT:
A braking device for use in a motor vehicle has a vacuum motor having a casing, a power piston displaceably mounted in the casing through a diaphragm which partitions the interior of the casing into a constant pressure chamber and a variable pressure chamber and which is adapted to be displaced by the pressure difference between the two chambers. A input rod of the braking device is connected to the brake pedal. A valve mechanism is disposed in the power piston and controls the pressure in the variable pressure chamber in response to force applied to the input rod. A control valve is connected to the vacuum motor and adapted to be electrically controlled by a controller to selectively supply driving pressure to the vacuum motor. A manual actuator is provided for controlling the controller in response to operation of the actuator or a force applied to the actuator, and a sensor is provided for detecting the amount by which the actuator is moved or the amount of force applied to the actuator and for sensing an output corresponding to the amount detected by the sensor to the controller. The controller determines whether the amount detected by the sensor is on an increasing gradient or a decreasing gradient and controls the current to be supplied to the control valve in such a manner that the current changes along a hysteresis loop to minimize the hysteresis of the braking force to be generated.
REFERENCES:
patent: 3364818 (1968-01-01), Hager et al.
patent: 3863993 (1975-02-01), Fleischer et al.
patent: 4043608 (1977-08-01), Bourg et al.
patent: 4512615 (1985-04-01), Kita et al.
patent: 4630706 (1986-12-01), Takayama et al.
patent: 4756231 (1988-07-01), Kobayashi et al.
patent: 4768841 (1988-09-01), Watanabe
patent: 4778223 (1988-10-01), Inoue
patent: 4784442 (1988-11-01), Petersen
Kashnikow Andres
Newholm Timothy
Tokico Ltd.
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