Fail safe brake antilock modulator
Abstract
Abstract A BRAKE PRESSURE MODULATOR FOR A VEHICLE BRAKE ANTILOCK SYSTEM INCLUDES A MODULATOR VALVE WHICH IS LOCATED FLUIDLY INTERMEDIATE THE BRAKE PRESSURE SOURCE AND THE CONTROLLED WHEEL BRAKE AND WHICH IS NORMALLY HELD UNSEATED BY A PISTON WHICH FORMS A WALL OF THE FLUID PASSAGE COMMUNICATING WITH THE WHEEL BRAKE. THE PISTON IS NORMALLY SUPPORTED BY FLUID PRESSURE AND THIS FLUID PRESSURE IS EXHAUSTED UPON IMPENDING WHEEL LOCK, ALLOWING THE PISTON TO WITHDRAW, SEATING THE MODULATOR VALVE TO ISOLATE THE BRAKE FROM THE BRAKE PRESSURE SOURCE AND WITHDRAWING BRAKE FLUID FROM THE WHEEL BRAKE TO PERMIT WHEEL ACCELERATION. THE INVENTION PROVIDES A PASSAGE WHICH BYPASSES THE MODULATOR VALVE, AND A NORMALLY CLOSED BYPASS VALVE IN THE BYPASS PASSAGE WHICH IS RESPONSIVE TO A SUBSTANTIALLY COMPLETE LOSS OF MODULATOR PISTON SUPPORTING PRESSURE TO OPEN BRAKE FLUID COMMUNICATION BETWEEN THE BRAKE PRESSURE SOURCE AND THE WHEEL BRAKES THROUGH THE BYPASS PASSAGE.
Inventors
- 👤 Erkki A Koivunen
Bibliographic Details
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