Fluid-pressure and analogous brake systems – Charging – Intermittent
Patent
1987-12-28
1988-08-30
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Charging
Intermittent
303 12, 303115, 303116, 303119, 303DIG3, 303100, 303DIG4, B60T 1368, B60T 1346
Patent
active
047671637
ABSTRACT:
In order to reapply the fluid operating pressure to the braking members of the wheels after an anti-locking operation has been carried out, a pumping device is provided which are driven by the subatmospheric pressure (vacuum) existing in the inlet manifold of the engine. The application of the braking pressure is controlled by a valve which receives an opening command signal consisting of a train of pulses from a control device. At least one vacuum sensor is provided which generates a monitoring signal indicative of the level of vacuum present in the inlet manifold. The control device causes opening of the valve with a command signal whose average is inversely proportional to the level of the monitoring signal generated by the vacuum sensor.
REFERENCES:
patent: 3840279 (1974-10-01), Pauwels
patent: 3950946 (1976-04-01), Sakai et al.
patent: 4002376 (1977-01-01), Kondo et al.
patent: 4168867 (1979-09-01), Ando et al.
patent: 4170066 (1979-10-01), Blomberg et al.
patent: 4296971 (1981-10-01), Nakazato
patent: 4311980 (1982-01-01), Prudenziati
Butler Douglas C.
Marelli Autronica S.p.A.
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