Single motor interactive engine multimode power system and driving method thereof

Abstract

The invention discloses a single motor interactive engine multimode power system and a driving method thereof. An engine is in driving connection with an input shaft which in driving connection with atransmission mechanism, the transmission mechanism is linked with at least one motor, and the transmission mechanism is in output transmission connection with an output gear. The engine is linked with the motors through the transmission mechanism, when the transmission mechanism is subjected to braking or releasing, engine separate drive, motor separate drive, high-efficiency power generation, rapid engine start and other drive modes are achieved, configuration needed by a plug-in hybrid vehicle is met, and the system has the advantages of being simple in transmission structure, small in motor size, superior in fuel saving and electricity saving performance, high in reliability, low in cost and the like.

Description

technical field [0001] The invention belongs to a vehicle power system, and in particular relates to a plug-in hybrid power system applied to a vehicle and a driving method thereof. Background technique [0002] With the rapid development of plug-in hybrid vehicles, there are mainly BSG hybrid devices, dual-motor coaxial hybrid devices and single-motor AMT hybrid devices on the market. For the hybrid power device of the BSG scheme, the engine drives a generator through the combined belt through the crankshaft belt to supplement electric energy for the battery pack, and the motor is used to directly drive the vehicle drive axle assembly, and a speed ratio of 1:1 is set between the engine and the motor. Automatic clutch, this solution has the following defects: 1. The BSG power generation system has a high failure rate, low transmission efficiency, large vibration and noise, and occupies a large volume in the car; 2. The peak torque of the main drive motor is extremely high, t...

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Problems solved by technology

For the hybrid power device of the BSG scheme, the engine drives a generator through the combined belt through the crankshaft belt to supplement electric energy for the battery pack, and the motor is used to directly drive the vehicle drive axle assembly, and a speed ratio of 1:1 is set between the engine and the motor. Automatic clutch, this solution has the following defects: 1. The BSG power generation system has a high failure rate, low transmission efficiency, large vibration and noise, and occupies a large volume in the car; 2. The peak torque of the main drive motor is extremely high, the volume and weight moment of inertia is large, and the cost is very high; 3. Engine fuel efficiency is low, high efficiency range is narrow and emission is poor

For the hybrid power device with dual-motor coaxial installation scheme, a generator is coaxially installed behind the flywheel of the engine to supplement electric energy for the battery pack. An automatic clutch with a ratio of 1:1, the disadvantages of this solution: the system is extremely heavy, the moment of inertia is extremely large, the cost is high, and the fuel efficiency of the engine is low.

For the hybrid power device of the single-motor AMT solution, an automatic clutch is installed behind the engine flywheel, and a power generation / drive motor is coaxially installed behind the automatic clutch to supplement electric energy for the battery pack and drive the vehicle. It is installed coaxially after the motor A multi-speed AMT gearbox, the defects of this solution: there is power interruption, the AMT box loses a lot when the motor generates power, the electric braking energy recovery is weak, the fuel saving rate is difficult to further improve, the cost is expensive, and the energy consumption of shifting is large, etc. question

The above three schemes are difficult to realize the joint multi-mode drive of the engine and the motor. More importantly, the dual-motor structure used in the hybrid power device leads to the disadvantages of large system volume and weight, high cost, complex control strategy, short clutch life and poor reliability.

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