Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Electric vehicle
Reexamination Certificate
1999-06-03
2001-05-15
Zanelli, Michael J. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Electric vehicle
C180S065230, C180S065800
Reexamination Certificate
active
06233508
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a drive power control device for a hybrid vehicle. In particular, the invention relates to improvements to a method of drive power distribution of an engine and a motor.
BACKGROUND OF THE INVENTION
A hybrid vehicle which runs on the drive power of an engine and a motor is known. A motor in such a hybrid vehicle is operated by the electrical power of a battery. A large drive force is obtained by operating both the engine and the motor at the same time when, for example, the vehicle is accelerating. When the charge of the battery is low, the motor functions as a generator. The battery is charged by the motor being driven by the engine to generate electricity.
However when the vehicle is running on the drive force of both the engine and the motor, in consideration of operating conditions such as generation of electricity by the motor, speed change control by the transmission or the response of the engine, it is necessary to control the motor and the engine cooperatively so that the response and overall effect of vehicle operation is optimized.
SUMMARY OF THE INVENTION
It is an object of the present invention to improve the response and overall effect of vehicle operation when running on the drive force of both the engine and the motor.
In order to achieve above the objects the present invention provides a drive power control device for a hybrid vehicle running by the drive power of an engine and/or a motor. The drive power control device comprises an accelerator sensor detecting a depression amount of an accelerator pedal, a vehicle speed sensor detecting a vehicle speed, a battery performing storage and output of electrical force with the motor, a battery sensor detecting the state of charge of the battery and a controller controlling the engine and the motor. The controller is comprised to calculate a target drive torque based on the vehicle speed detection value and the accelerator pedal depression amount value, calculate a generator torque of the motor based on the state of charge detected value, control the engine to a torque value to obtain the target drive torque and the generator torque as a target engine torque, estimate an actual torque of the engine, and control the motor to a difference of the target drive torque and the engine torque estimated value as a target motor torque.
The details as well as other features and advantages of the invention are set forth in the remainder of the specification and are shown in the accompanying drawings.
REFERENCES:
patent: 5785138 (1998-07-01), Yoshida
patent: 5806617 (1998-09-01), Yamaguchi
patent: 6090007 (2000-07-01), Nakajima et al.
patent: 800 945 (1997-10-01), None
Patent Abstracts of Japan, vol. 1997, No. 3, 3/97, “Hybrid Vehicle”—ABSTRACT.
Deguchi Yoshitaka
Itoyama Hiroyuki
Kitajima Yasuhiko
Foley & Lardner
Nissan Motor Co,. Ltd.
Zanelli Michael J.
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