B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/73, 303/74
B60T 8/42 (2006.01) B60T 8/50 (2006.01) B60T 8/94 (2006.01)
Patent
CA 1310040
MODULATOR WITH TWO-STAGE ORIFICED MASTER CYLINDER BYPASS VALVE Abstract of the Disclosure A vehicle wheel brake system having a service braking section and a wheel lock control (ABS) section. Under certain conditions the wheel lock control section may not be able to generate sufficient pressure to operate the vehicle wheel brakes when the master cylinder output pressure has been isolated therefrom. When such conditions occur, the displacement piston of the ABS control section moves to open a bypass valve which connects master cylinder output pressure to the vehicle wheel brake even though the ABS system has isolated it from that wheel brake. The bypass valve is a two-stage orifice valve arrangement which provides orifice control of master cylinder pressure during initial brake actuation and provides two stage valve opening action when the master cylinder output pressure is to be delivered to the wheel brake to actuate that brake irrespective of the attempted control of the wheel brake by the ABS section of the brake system. This therefore effectively returns the vehicle braking system to service braking until the vehicle operator releases the brake system.
583331
Flory Donald M.
Mort Dewey F.
Reuter David F.
Flory Donald M.
General Motors Corporation
Gowling Lafleur Henderson Llp
Mort Dewey F.
Reuter David F.
LandOfFree
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