CN-121976900-A - Hybrid vehicle

Abstract

The invention provides a hybrid vehicle which can inhibit the freezing of moisture in blow-by gas without affecting the running performance. A hybrid vehicle is provided with an engine and a motor, a clutch that switches between an engaged state in which power from the engine can be transmitted to a drive wheel and a disengaged state in which power cannot be transmitted, a supercharger that includes a compressor and a turbine that are disposed in an intake passage and an exhaust passage of the engine, respectively, and a variable nozzle mechanism that adjusts the flow rate of exhaust gas flowing into the turbine by the opening degree of a nozzle, an intercooler that is disposed in the intake passage on the downstream side of the compressor, a return passage that causes blow-by gas generated by the engine to flow to the intake passage on the upstream side of the compressor, a communication passage that has one end connected to the intake passage on the downstream side of the compressor and on the upstream side of the intercooler, and an opening/closing valve that opens and closes the communication passage.

Inventors

• INO TOMOHIRO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260505

Application Date

20251020

Priority Date

20241030

Claims (3)

1. 1. A hybrid vehicle is characterized by comprising: an engine and a motor capable of transmitting power to the drive wheels; A clutch that switches between an engaged state in which power from the engine can be transmitted to the drive wheel and a disengaged state in which power cannot be transmitted, in a state in which power from the motor can be transmitted to the drive wheel; A supercharger including a compressor and a turbine disposed in an intake passage and an exhaust passage of the engine, respectively, and a variable nozzle mechanism for adjusting a flow rate of exhaust gas flowing into the turbine by an opening degree of a nozzle; an intercooler provided on a downstream side of the intake passage from the compressor; A return passage that causes blow-by gas generated by the engine to flow to the intake passage on an upstream side of the compressor; A communication passage having one end connected to the intake passage on a downstream side of the compressor and on an upstream side of the intercooler and the other end connected to the return passage; an opening/closing valve for opening/closing the communication passage, and And a control device that controls the opening degree of the nozzle based on the variable nozzle mechanism to pressurize intake air by the compressor and to open the on-off valve when the clutch is in the disengaged state, the motor is running, and the engine is driving.
2. 2. The hybrid vehicle of claim 1, wherein, The one end of the communication passage is closer to the compressor than the intercooler.
3. 3. The hybrid vehicle of claim 2, wherein, The control device controls the opening degree of the nozzle to a minimum value when the clutch is in the disengaged state, the motor is running, and the engine is driving.

Description

Hybrid vehicle Technical Field The present invention relates to a hybrid vehicle. Background The engine of a hybrid vehicle is sometimes provided with a supercharger. The supercharger has a compressor and a turbine, and also has a variable nozzle mechanism that adjusts the flow rate of exhaust gas flowing into the turbine by the opening degree of the nozzle (for example, refer to patent document 1). Patent document 1 Japanese patent application laid-open No. 2017-145748 Disclosure of Invention The hybrid vehicle may be provided with a return passage that flows blow-by gas generated by the engine to an upstream side of the intake passage than the compressor. Moisture in the blow-by gas flowing through the return passage may freeze to form ice cubes. The ice cubes may collide with the compressor to affect durability. Therefore, it is desirable to suppress freezing of moisture in such blowby gas, but it is desirable to be able to be realized without affecting the running performance of the hybrid vehicle. Accordingly, an object of the present invention is to provide a hybrid vehicle that suppresses freezing of moisture in blow-by gas without affecting running performance. The above object can be achieved by a hybrid vehicle including an engine and a motor that can transmit power to drive wheels, a clutch that switches between an engaged state in which power from the engine can be transmitted to the drive wheels and a disengaged state in which power cannot be transmitted, the hybrid vehicle including a compressor and a turbine that are disposed in an intake passage and an exhaust passage of the engine, respectively, and a variable nozzle mechanism that adjusts a flow rate of exhaust gas flowing into the turbine by opening degrees of nozzles, an intercooler that is disposed in a position downstream of the compressor in the intake passage, a return passage that causes blowby gas generated by the engine to flow to the intake passage upstream of the compressor, a communication passage that has one end connected to the intake passage downstream of the compressor and upstream of the intercooler, and the other end connected to the return passage, an opening/closing valve that is opened by the engine and the clutch in a state in which the opening/closing valve is controlled by opening the engine and the nozzle is opened by the opening/closing valve mechanism. The one end of the communication passage may be closer to the compressor than the intercooler. The control means may control the opening degree of the nozzle to a minimum value when the clutch is in the disengaged state, the motor is running, and the engine is driving. Effects of the invention According to the present invention, it is possible to provide a hybrid vehicle in which freezing of moisture in blowby gas is suppressed without affecting running performance. Drawings Fig. 1 is a schematic configuration diagram of a hybrid vehicle of the embodiment. Fig. 2 is a schematic structural view of the engine. Fig. 3 is a flowchart illustrating blow-by gas temperature increase control performed by the ECU. Fig. 4 is an explanatory diagram of the flow of intake air in a state where the opening/closing valve is opened. Detailed Description [ Schematic structure of hybrid vehicle ] Fig. 1 is a schematic configuration diagram of a hybrid vehicle 1. In the hybrid vehicle 1, a clutch 40, a motor 45, and a transmission 50 are provided in this order in a power transmission path from the engine 10 to the drive wheels 60. The engine 10 and the motor 45 are mounted as driving sources for running the hybrid vehicle 1. Engine 10 is capable of transmitting power to drive wheels 60 via electric machine 45, transmission 50, differential 55. The motor 45 is capable of transmitting power to the drive wheels 60 via the transmission 50, the differential 55. The engine 10 is, for example, a gasoline engine, but may be a diesel engine. The transmission 50 includes a torque converter and an automatic transmission. The clutch 40 is provided between the engine 10 and the motor 45 on the same power transmission path. The clutch 40 receives hydraulic pressure supply from the disengaged state to be in the engaged state, and connects the power transmission between the engine 10 and the motor 45. In other words, in the engaged state, the power of the engine 10 can be transmitted to the driving wheels 60. The clutch 40 is in a disengaged state by stopping the hydraulic pressure supply, and the power transmission between the engine 10 and the motor 45 is cut off. In other words, in the disengaged state, the engine 10 is disconnected from the power transmission path, and the power of the engine 10 cannot be transmitted to the drive wheels 60. The motor 45 is connected to the battery 70 via the PCU 65. The motor 45 functions as a running power source of the hybrid vehicle 1 in accordance with the power supply from the battery 70. The motor 45 also functions as a generator for charging the battery 70