US 12,246,695 B2
Controller for hybrid electric vehicle
Mitsuru Yamaguchi, Ama (JP); and Masayuki Baba, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Nov. 10, 2022, as Appl. No. 17/984,341.
Claims priority of application No. 2022-012307 (JP), filed on Jan. 28, 2022.
Prior Publication US 2023/0242088 A1, Aug. 3, 2023
Int. Cl. B60W 20/10 (2016.01); B60K 6/40 (2007.10)
CPC B60W 20/10 (2013.01) [B60K 6/40 (2013.01); B60W 2510/1005 (2013.01); B60W 2510/1015 (2013.01); B60W 2710/1011 (2013.01); B60Y 2200/92 (2013.01)] 4 Claims
OG exemplary drawing
 
1. 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.