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. 14, 2003
Filed:
Sep. 25, 2000
Masahiko Amano, Hitachioota, JP;
Ryoso Masaki, Hitachi, JP;
Taizo Miyazaki, Hitachi, JP;
Tomoyuki Hanyu, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An altitude calculation unit estimates an inclination of a road from vehicle speed and vehicle drive torque, and calculates altitude of a vehicle. A battery management unit calculate difference between average altitude determined from the past altitude history and the present altitude and varies a target value of battery charging rate or upper and lower limit values thereof in response to the difference. Charging and discharging command value is calculated in response to difference between charging rate detection value and the target value or the upper and lower limit values. An integrated control unit sets output share between an engine and a motor based on vehicle target drive torque calculated by a target toque determination unit and charging and discharging command from the battery management unit , determines an optimum operation point of the engine and issues a control command to the engine and the motor. Thereby, even when a travelling route ahead of the vehicle is not set, a possible prevention of regenerative braking due to full charging during downhill rolling is avoided and a fuel economy for a hybrid vehicle is improved in total.