CN-121989661-A - Hybrid vehicle

Abstract

A hybrid vehicle that ensures running performance in a motor running mode and ensures cooling performance of a motor and an electric power supply device includes an engine, a fan that rotates in conjunction with the engine, a first motor that is connected to the engine and is provided in a power transmission path between the engine and drive wheels, a second motor that is provided in the power transmission path, a torque converter that is provided in the power transmission path between the first motor and the second motor, first and second electric power control devices that control electric power to the first and second motors, respectively, a motor radiator that is cooled by the fan and that promotes heat dissipation of cooling water circulating through the first and second motors and the first and second electric power control devices, and a vehicle control device that controls the second electric power control device to run the hybrid vehicle by the second motor and controls the first electric power control device to rotate the fan by the first motor via the engine in a motor running mode in which combustion in the engine is stopped.

Inventors

• YOSHIKI MAKOTO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20250918

Priority Date

20241107

Claims (4)

1. 1. A hybrid vehicle, wherein, The hybrid vehicle includes: An engine; A fan that rotates in conjunction with the engine; A first motor connected to the engine and provided in a power transmission path between the engine and a drive wheel; a second motor provided on the power transmission path; a torque converter provided on the power transmission path between the first motor and the second motor; A first power control device that controls power to the first motor; A second power control device that controls power to the second motor; a motor radiator cooled by the fan to promote heat dissipation of cooling water circulating in the first and second motors and the first and second power control devices, and And a vehicle control device that controls the second electric power control device to drive the hybrid vehicle by the second electric motor and controls the first electric power control device to rotate the fan via the engine by the first electric motor in a motor drive mode in which combustion in the engine is stopped.
2. 2. The hybrid vehicle as set forth in claim 1, wherein, The vehicle control device controls the second electric power control device to drive the hybrid vehicle by the second electric motor when there is a running request in the motor running mode and the required driving force of the hybrid vehicle is equal to or less than a threshold value, and controls the first electric power control device and the second electric power control device to drive the hybrid vehicle by the first electric motor and the second electric motor when there is a running request in the motor running mode and the required driving force is equal to or greater than the threshold value.
3. 3. The hybrid vehicle as set forth in claim 2, wherein, The hybrid vehicle includes: An automatic transmission provided on the power transmission path between the torque converter and the second motor, and A first clutch provided in the automatic transmission, The vehicle control device engages the first clutch when the vehicle is traveling in the motor traveling mode, releases the first clutch and controls the second power control device to stop the second motor when the vehicle is stationary in the motor traveling mode, and controls the first power control device to rotate the fan via the engine by the first motor.
4. 4. The hybrid vehicle as set forth in claim 3, wherein, The hybrid vehicle includes: a second clutch provided on the power transmission path between the engine and the first motor, The vehicle control device engages the second clutch in the motor running mode.

Description

Hybrid vehicle Technical Field The present invention relates to a hybrid vehicle. Background A hybrid vehicle is known that includes an engine, a fan that rotates in conjunction with the engine, an electric motor, and a power control device that controls electric power to the electric motor, and an engine radiator cooled by the fan (see, for example, patent literature 1). Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication 2016-112933 Disclosure of Invention Problems to be solved by the invention In order to ensure cooling performance of the motor and the power control device, a motor radiator may be provided in addition to the engine radiator. In this case, in the motor running mode in which the engine is stopped and the motor is driven, the fan is also stopped. Therefore, the motor radiator may not be sufficiently cooled, and cooling of the motor and the power supply device may be insufficient. In the motor running mode, if the power of the motor is reduced, the running performance may be reduced. Accordingly, an object of the present invention is to provide a hybrid vehicle that ensures the running performance in the motor running mode and also ensures the cooling performance of the motor and the electric power supply device. Means for solving the problems The above object is achieved by a hybrid vehicle including an engine, a fan that rotates in conjunction with the engine, a first electric motor that is connected to the engine and is provided in a power transmission path between the engine and a drive wheel, a second electric motor that is provided in the power transmission path, a torque converter that is provided in the power transmission path between the first electric motor and the second electric motor, a first electric power control device that controls electric power to the first electric motor, a second electric power control device that controls electric power to the second electric motor, a motor radiator that is cooled by the fan and that promotes heat dissipation of cooling water circulating between the first electric motor and the second electric motor and between the first electric power control device and the second electric power control device, and a vehicle control device that controls the second electric power control device to run the hybrid vehicle by the second electric motor and controls the first electric power control device to rotate the fan by the first electric motor via the engine in a motor running mode in which combustion in the engine is stopped. The vehicle control device may control the second electric power control device to drive the hybrid vehicle by the second electric motor when there is a running request in the electric motor running mode and the required driving force of the hybrid vehicle is equal to or less than a threshold value, and the vehicle control device may control the first electric power control device and the second electric power control device to drive the hybrid vehicle by the first electric motor and the second electric motor when there is a running request in the electric motor running mode and the required driving force is equal to or greater than the threshold value. The hybrid vehicle may further include an automatic transmission provided on the power transmission path between the torque converter and the second electric motor, and a first clutch provided on the automatic transmission, wherein the vehicle control device may engage the first clutch when the vehicle is traveling in the electric motor traveling mode, and may release the first clutch to control the second electric power control device to stop the second electric motor and control the first electric power control device to rotate the fan via the engine by the first electric motor when the vehicle is stationary in the electric motor traveling mode. The hybrid vehicle may further include a second clutch provided in the power transmission path between the engine and the first motor, and the vehicle control device may be configured to engage the second clutch in the motor running mode. Effects of the invention According to the present invention, it is possible to provide a hybrid vehicle that ensures the running performance in the motor running mode and also ensures the cooling performance of the motor and the electric power supply device. Drawings Fig. 1 is a schematic configuration diagram of a hybrid vehicle. Fig. 2 is a schematic configuration diagram of the cooling system. Fig. 3 is a flowchart illustrating motor travel control. Description of the reference numerals 1. Hybrid vehicle 2. Cooling system 10. Engine with a motor 11. Crankshaft 12. Fan with fan body 14 K0 clutch (second clutch) 15. First motor 16. Torque converter 17. Automatic transmission 17C AT clutch (first clutch) 22. Second motor 40. Storage battery 41. First PCU (first power control device) 42. Second PCU (second power control device) 52. Motor radiator 100 ECU (vehic