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:
Jan. 15, 1980
Filed:
Apr. 26, 1978
Robert C Snyder, Country Club Hills, IL (US);
Motor Wheel Corporation, Lansing, MI (US);
Abstract
A skid control system and method for use in conjunction with a vacuum-boosted hydraulic brake system of the type presently used in automotive passenger vehicles. The velocity of each monitored vehicle wheel is sensed and a signal indicative of wheel deceleration is derived. A skid control valve is connected to the vacuum booster of the brake system to vent the booster vacuum chamber to the atmosphere when an excessive wheel deceleration is detected at any one of the monitored wheels and thereby relieve brake pressure at all of the monitored wheels. When the wheel begins to speed back up to vehicle speed, the skid control valve is pulsed by a control signal having a predetermined frequency and having a duty cycle which increases a function of time over a predermined control period. In this manner, the brake pressure at the monitored wheels is gradually increased as a function of time until the brake pressure desired by the vehicle operator is again achieved.