Hybrid-vehicle control device
AssigneeNissan Motor Co., Ltd.
InventorTadashi Okuda
Life of this patent
Estimating the term…
Abstract
Provided is a hybrid-vehicle control device that can continue high-speed driving, without transitioning to the HEV mode, by raising the motor torque limit during driving in the EV mode. The hybrid-vehicle control device includes: an engine; a motor that starts the engine and that drives driving wheels; a first clutch that switches between the HEV mode and the EV mode; an automatic transmission; and an electric-vehicle mode control means. The smaller the transmission ratio of the transmission is during driving in the EV mode, the smaller the value of the engine start torque, which is reserved for transitioning to the HEV mode, is made by the electric-vehicle mode control means.
Claims7
A control device for a hybrid vehicle comprising:
- an engine;
- a motor disposed in a driveline between the engine and driving wheels;
- mode switching means for selectively switching between a hybrid vehicle mode using the engine and the motor as a driving source, and an electric vehicle mode using the motor as the driving source;
- a transmission disposed between the motor and the driving wheels;
- and
- an electric vehicle mode control means configured such that:
- during a travel in the electric vehicle mode when a transmission ratio is at or less than a predetermined value, an engine startup torque preserved for transition to the hybrid vehicle mode is set to a smaller torque than a required torque for engine startup;
- the engine startup torque is set smaller as the transmission ratio decreases;
- and
- a clutch engagement capacity of a clutch selectively engaged downstream of the motor is reduced by a difference between the required torque for engine startup and the set engine startup torque, thereby compensating the required torque for engine startup.
Dependencies are inferred from the claim text.