Hybrid vehicle

Details Hybrid vehicle Hybrid vehicle

1999-06-15

2001-01-16

Cuchlinski, Jr., William A. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Electric vehicle

C701S051000, C701S054000, C192S1030FA, C477S002000, C477S005000, C477S166000

Reexamination Certificate

active

06175785

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a hybrid vehicle equipped with an engine and a motor as a power source, and which is driven by the engine and/or motor.
BACKGROUND OF THE INVENTION
A hybrid vehicle fitted with a motor and an engine connected in series via a clutch is disclosed in Tokkai Hei 9-286245 published by the Japanese Patent Office in 1997. In this vehicle, at low engine rotation speed when the engine efficiency is low and the vehicle is starting under low load, the clutch is released and the vehicle is driven only by the motor. When the vehicle speed has risen to some extent, the clutch is engaged and the power source is changed over from the motor to the engine.
SUMMARY OF THE INVENTION
However, if the torque and rotation speed of the motor and those of the engine before the engagement of the clutch do not coincide, a shock will occur when the clutch is engaged.
It is therefore an object of this invention to eliminate the shock occurring when the power source in a hybrid vehicle is changed over.
In order to achieve the above object, this invention provides a hybrid vehicle comprising an engine and motor, and driven by selectively applying the engine or the motor as a power source, comprising a transmission connected to the motor, a clutch interposed between the engine and the motor, a generator connected to the engine, a sensor for detecting a rotation speed of the engine, a sensor for detecting a rotation speed of the motor. The hybrid vehicle further comprises a microprocessor which is programmed to control a torque of the engine to achieve a predetermined target torque, primarily control a power generation amount of the generator so that the power generation amount of the generator is equal to the torque of the engine, secondarily control a power generation amount of the generator so that the rotation speed of the engine coincides with the rotation speed of the motor, and tighten the clutch when the rotation speeds of the motor and the engine coincide.
The details as well as other features and advantages of this invention are set forth in the remainder of the specification and are shown in the accompanying drawings.


REFERENCES:
patent: 5697466 (1997-12-01), Moroto et al.
patent: 5722502 (1998-03-01), Kubo
patent: 5928301 (1999-07-01), Soga et al.
patent: 6090007 (2000-07-01), Nakajima et al.
patent: 9-286245 (1997-11-01), None

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