Control system for hybrid vehicles

Details Control system for hybrid vehicles Control system for hybrid vehicles

1997-03-27

1999-01-19

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Electric vehicle

701103, 180 652, 180 654, G06G 776, B60K 100

Patent

active

058624970

ABSTRACT:
There is provided a control system for a hybrid vehicle including an internal combustion engine, a drive shaft driven by the engine, a motor operable on electrical energy for driving the drive shaft, and electrical storage device for supplying electrical energy to the motor. An amount of assistance of the motor to the engine by driving the drive shaft is calculated based at least on load on the engine. An output from the motor is controlled based on the amount of assistance of the motor to the engine. It is determined whether conditions are satisfied for a lean operating mode of the engine in which an air-fuel ratio of a mixture supplied to the engine is controlled to a leaner value than a stoichiometric value. Changeover of an operating mode of the engine is carried out between a stoichiometric operating mode in which the air-fuel ratio of the mixture supplied to the engine is controlled to a value at or close to the stoichiometric value and the lean operation or the lean operating mode, based on the amount of assistance of the motor to the engine and results of the determination of the lean operating condition.

REFERENCES:
patent: 5323868 (1994-06-01), Kawashima
patent: 5327987 (1994-07-01), Abdelmalek
patent: 5327991 (1994-07-01), Yoshida
patent: 5492190 (1996-02-01), Yoshida
patent: 5566774 (1996-10-01), Yoshida
patent: 5588498 (1996-12-01), Kitada
patent: 5664635 (1997-09-01), Koga et al.
patent: 5697466 (1997-12-01), Moroto et al.
patent: 5751137 (1998-05-01), Kiuchi et al.

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