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:
Jun. 12, 2001
Filed:
Apr. 23, 1999
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A negative pressure control apparatus for a brake booster for controlling a negative pressure in a negative pressure chamber of the brake booster is provided. The apparatus is applied to a system having a booster charge mechanism for generating a fluid pressure by using the negative pressure in the negative pressure chamber and a fluid pressure control mechanism for controlling a brake fluid pressure by using the fluid pressure generated by the booster charge mechanism as a fluid pressure source. The apparatus includes a negative pressure controller for controlling the negative pressure in the negative pressure chamber to be at least a predetermined target negative pressure. A temperature detector detects information relating to a temperature of brake fluid. A target negative pressure setting part sets the predetermined negative pressure based on the temperature of the brake fluid.