Series connection range extending type electric automobile power system and control method thereof

Abstract

The invention provides a series connection range extending type electric automobile power system. The system is characterized by comprising an engine, a first motor, a second motor, a first clutch, a second clutch, a first inverter, a second inverter and a power battery; the engine is connected with the first clutch through a first transmission shaft; the first clutch is connected with the first motor through a second transmission shaft; the first motor is connected with the second clutch through a third transmission shaft; the second clutch outputs power to front wheels of an automobile through a main speed reducer and a differential mechanism of a front axle of the automobile; the second motor outputs power to rear wheels of the automobile through a main speed reducer and a differential mechanism of a rear axle of the automobile; and the power battery is connected with the first motor through the first inverter and connected with the second motor through the second inverter.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and relates to a series-extended-range electric vehicle, in particular to a series-extended-range electric vehicle power system and a control method thereof. Background technique [0002] A series extended-range electric vehicle is a purely electric vehicle equipped with an on-board power battery and an auxiliary power unit (Auxiliary Energy Unit, APU). When the electric energy is sufficient, the battery provides all the energy required for the vehicle to run. , the auxiliary power unit works. [0003] The current series extended-range electric vehicle power system generally includes two electric motors and one engine. The power of the engine and auxiliary motor is generally small, and the engine and auxiliary motor do not directly drive the vehicle. It will start, drive the auxiliary motor to generate electricity, provide energy for the main drive motor, and the main drive motor will drive the ...

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Problems solved by technology

[0007] In the series extended-range electric vehicle described in the above-mentioned patent documents, since the auxiliary motor cannot directly participate in driving the vehicle, the vehicle cannot realize four-wheel drive, and the driving force of the front and rear axles cannot be reasonably distributed according to the ground adhesion when the vehicle accelerates rapidly, and the vehicle is prone to slipping, thus Affect the dynamic performance of the whole vehicle in the CD stage

[0008] In addition, the tandem extended-range electric vehicle described in the above-mentioned patent documents has a single control method, a single driving mode, no power mode and an economical mode, and the vehicle lacks driving pleasure. When the power of the battery drops to a certain level, that is, it enters the CS stage, and the vehicle's power performance is poor, which can only meet the needs of the user to go home.

[0009] For the systems disclosed in Patent Document 1 and Patent Document 2, the front axle assembly includes a transmission, which is costly, complex in structure, large in axial size, and difficult to arrange in the cabin; in addition, the engines described above can directly drive Vehicles, it means that the engine power is large, the engine loss is large, the fuel consumption is high, and the emission is poor; finally, the system cannot realize the series connection function, so when the battery power is low and the vehicle speed is low, only the engine can participate in the driving, causing the engine Low load rate, poor operating point, high fuel consumption

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