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:
Aug. 27, 1991
Filed:
Jun. 11, 1990
David Sol, Dearborn, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A method and system for controlling a vehicle braking system on slippery surfaces and hills uses estimates of external conditions from vehicle and engine measurements in a feedforward manner to control vehicle brake pressure on slippery or changing surfaces and hills to compensate for external disturbances in an optimal manner. The present invention provides a dual feedforward/feedback system for and method of controlling vehicle braking. The method includes the step of generating a first disturbance value related to the slope of a hill and a second disturbance value related to the coefficient of friction of the road surface. The first and second disturbance values are then summed to generate a feedforward control value for controlling the level of vehicle braking. The system for controlling vehicle braking includes a first disturbance value related to the slope of a hill and a second disturbance value related to the coefficient of friction of the road surface. The first and second disturbance values are summed to generate a feedforward control value for controlling the level of vehicle braking.