Power brake system differential air pressure control valve assem

Details Power brake system differential air pressure control valve assem Power brake system differential air pressure control valve assem

1979-06-25

1981-09-29

Hershkovitz, Abraham

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

60404, 60415, 91451, 137115, 1371163, F01B 2102

Patent

active

042916127

ABSTRACT:
A power brake system has a brake booster operable by differential air pressure provided by a source of vacuum and a source of compressed air pressure. The differential air pressure control valve assembly of the invention maintains a substantially constant available differential of air pressure between the vacuum and compressed air pressures available to the brake booster for booster operation. In the charging mode it directs air pressure from an air pressure pump to an accumulator connected to the pressure inlet side of the booster, charging until the desired pressure differential is attained. In the storage mode, the air pressure from the pump is permitted to flow in its usual manner to another device or circuit utilizing the air pressure. This may be, for example, a part of the vehicle engine emission control system. In the pressure relief mode, the control valve vents excess accumulated pressure to exhaust.

REFERENCES:
patent: 3434388 (1969-03-01), Julow
patent: 3768366 (1973-10-01), Grabb
patent: 3818702 (1974-06-01), Woo
patent: 4174610 (1979-11-01), Hollis
patent: 4175387 (1979-11-01), Miura
patent: 4177642 (1979-12-01), Klimazewski

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