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, 2002
Filed:
Jan. 23, 2001
Kenji Nakashima, Shizuoka, JP;
Jatco Transtechnology Ltd., Fuji, JP;
Abstract
In a parallel hybrid vehicle employing a parallel hybrid system, using both an internal combustion engine and an electric motor generator for propulsion, a desired motor/generator torque is map-retrieved based on both the engine speed and throttle opening from a predetermined characteristic map in a fashion of feedforward processing. The signal indicative of the desired motor/generator torque is subjected to a low-pass filter that passes signals included in a frequency band lower than an oscillation frequency of powertrain torsional vibrations to remove the powertrain vibration frequency components. The map is preprogrammed so that the desired motor/generator torque is set at zero in a specified speed range lower than an engine idle speed. In another specified speed range from the engine idle speed to a predetermined direct-coupling engine speed that permits the motor/generator to be directly coupled with the engine, a gain of the desired motor/generator torque is set to increase with an increase in the engine speed. In a specified speed range above the predetermined direct-coupling engine speed, the motor/generator is coupled directly with the engine, so that the motor/generator torque output produced from the motor/generator is substantially identical to the engine torque output.