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:
Feb. 12, 1991
Filed:
Feb. 21, 1989
Kazunori Ishikawa, Toyota, JP;
Kazumasa Tsukamoto, Toyota, JP;
Takuji Taniguchi, Wakamatsu, JP;
Yuji Kashihara, Toyota, JP;
Kunihiro Iwatsuki, Toyota, JP;
Hiroji Taniguchi, Toyota, JP;
Aisin Aw Co., Ltd., Aichi, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
Hydraulic pressure which is regulated by a pressure control valve (linear solenoid valve) is applied to a hydraulic servo of a brake which is actuated when an engine-brake is effected. When the engine-brake is effected, a hydraulic pressure which is modulated by a modulator valve controlled by the linear solenoid valve is applied to the brake hydraulic servo. The pressure control valve provides high hydraulic pressure when vehicle speed is high based on signals from a speed sensor, and provides low hydraulic pressure when vehicle speed is low based on signals from the speed sensor, so that an engine-brake force is adequately controlled in accordance with vehicle speed. Furthermore, if a foot brake sensor is employed, the hydraulic pressure in accordance with vehicle speed can be made low when the engine-brake is effected with the foot brake applied. Based on signals from a front wheel rotation sensor and a rear wheel rotation sensor, the control unit calculates a rotational difference, so that the engine-brake force can be made low when the rotational difference is large.