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:
Sep. 15, 1987
Filed:
Aug. 20, 1985
Hiroshi Miyata, Toyota, JP;
Shinji Katoh, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In a power-assisted steering system including an electrically operated bypass valve mounted on a hydraulic power cylinder and disposed within a bypass passage between opposite fluid chambers of the cylinder to permit bypass flow passing therethrough in its energized condition, an electric control apparatus includes a first sensor arranged to detect a travel speed of the vehicle for producing a first electric signal indicative of the vehicle speed, a second sensor arranged to detect a rotation speed of a prime mover of the vehicle for producing a second electric signal indicative of the rotation speed of the prime mover, a microcomputer responsive to the first and second electric signals for determining an optimum steering effort in relation to each value of the electric signals on a bais of predetermined respective functions of the vehicle speed and the rotation speed of the prime mover and for producing an electric control signal indicative of the optimum steering effort. The bypass valve is energized by the electric control signal applied thereto from the computer to control the opening degree of the bypass passage in accordance with the value of the electric control signal.