Electrically controllable pressure medium brake for vehicles

Details Electrically controllable pressure medium brake for vehicles Electrically controllable pressure medium brake for vehicles

1991-01-28

1992-09-15

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Multiple control

Fluid and electric

303 9, 303DIG2, B60T 818

Patent

active

051471140

ABSTRACT:
The electrically controllable pressure medium brake comprises an electric pressure means (EP) converter (1) to convert an electrical brake request signal into a brake pressure. By way of an emergency brake valve (1), this brake pressure (in the normal case) and a vehicle load-dependent emergency brake pressure limited by a limiting valve (12) (in an emergency), is fed to the brake cylinder (14). For vehicle load-dependent limitation of the emergency brake pressure, a second EP converter (1a) generates from a vehicle load-dependent, electrical signal a vehicle load-dependent pressure medium pressure, which is stored in a pressure medium reservoir (18) and is fed to the limiting valve (12) in order to control it. The second EP converter (1a) is closed in the currentless state, during a power failure, whereby the vehicle load-dependent pressure medium pressure is preserved and the limiting valve (12) can thus continue to limit the emergency brake pressure as a function of the vehicle load. In another embodiment supplemented by a switching valve, only one EP converter serves to generate both the brake pressure and the vehicle load-dependent pressure medium pressure.

REFERENCES:
patent: 4139239 (1979-02-01), Stauble et al.
patent: 4536039 (1985-08-01), Barberis
patent: 4564245 (1986-01-01), Barberis
patent: 4592597 (1986-06-01), Hommen et al.
patent: 4645271 (1987-02-01), Brearey et al.
patent: 4682823 (1987-07-01), Hommen et al.

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