Controller for hybrid electric vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMitsuru Yamaguchi, Masayuki Baba
Life of this patent
Estimating the term…
Abstract
During BEV running that a vehicle is caused to run by using power of an electric motor, a determination threshold for determining whether to start an engine is corrected by estimating a shortage of driving force in advance based on a gear stage of an automatic transmission and a turbine rotation speed (that is, an AT input shaft rotation speed of the automatic transmission). Therefore, the engine is started at appropriate timing for a change in required MG torque, with the result that the shortage of driving force of the vehicle is suppressed.
Claims4
A controller for a hybrid electric vehicle that includes an engine and an electric motor functioning as a driving force source for propelling the hybrid electric vehicle, and a transmission inserted in a driveline between a drive wheel and each of the engine and the electric motor, the controller comprising
- a control unit configured to start the engine when a required torque of the electric motor becomes greater than a preset determination threshold during motor running that the hybrid electric vehicle is caused to run by using power output from the electric motor, wherein
- the transmission includes a plurality of gear stages and the determination threshold is configured to be corrected based on the gear stage of the transmission and an input shaft rotation speed of an input shaft of the transmission or a value related to the input shaft rotation speed such that the determination threshold is one of a plurality of determination thresholds that are different from one another and each individually corresponding with the plurality of gear stages.
Dependencies are inferred from the claim text.