The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2012
Filed:
Jun. 11, 2007
Timothy M. Karnjate, Grand Blanc, MI (US);
William K. Manosh, White Lake, MI (US);
Timothy M. Karnjate, Grand Blanc, MI (US);
William K. Manosh, White Lake, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
At vehicle startup and vehicle shutdown, the driver modulates the brake pressure directly by depressing the brake pedal and the driver feels pedal resistance. During normal conditions of vehicle operation after vehicle startup, pressure boosted actuation of the vehicle brakes is provided by the modulation of boosted pressure from an accumulator via a boost valve operable in response to brake pedal depression, while an isolation valve isolates the pedal from direct influence by the brake pressure and the driver feels pedal resistance provided by a pedal simulator. Upon shutdown of boosted actuation, the boost valve reduces the brake pressure gradually over a calibrated period of time until the brake pressure substantially equals the pedal resistance then felt by the driver. Then the isolation valve reestablishes driver's feel of the brake pressure without an abrupt change in pedal resistance upon the reversion from boosted actuation to hydraulic unboosted actuation.