Series-parallel connection plug-in hybrid electrical vehicle driving system and method

Abstract

The invention discloses a series-parallel connection plug-in hybrid electrical vehicle driving system and method. The driving system structurally comprises a driving motor, an energy storage unit, a combustion motor, a power separator, a power variator and a charger, wherein the driving motor serves as an electric generator and an electric motor, one end of the electric motor is connected with the energy storage unit through the power variator, and the other end of the electric motor is connected with the power separator connected with the combustion motor. By using the driving system and the method, the mechanical connection mechanism can be effectively simplified, the size and weight are reduced, the electric motor selectively performs driving according to different operation conditions of a vehicle and capacitance of the energy storage unit, effective flowing of energy among the combustion motor, the electric motor and the energy storage unit can be guaranteed, efficiency of the electrical driving system is improved, and the fault occurrence rate is reduced.

Description

technical field [0001] The invention belongs to the field of electric drive systems of electric vehicles, more specifically, relates to an electric drive system of a plug-in hybrid electric vehicle and a driving method of the system, and belongs to the field of drive and control of electric vehicles. Background technique [0002] With the rapid development of the economy, cars have become a necessity of daily life. However, most of the cars currently rely on internal combustion engines, leading to problems such as energy shortages and environmental pollution. Electric Vehicle (EV for short) has been vigorously promoted by government departments and related businesses of various countries in recent years due to its advantages such as high energy utilization rate and low pollution. [0003] Plug-in Hybrid Electric Vehicle (PHEV for short) adopts the electric drive as the main drive mode and the internal combustion engine as the auxiliary drive mode (controlled by the energy m...

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Problems solved by technology

This type of electric drive system has good steady-state performance and fault redundancy, but it has the following shortcomings in actual operation: (1) The generator (Generator, referred to as G) and the motor (Motor, referred to as M) work separately, mechanically connected Complex, takes up a lot of space, and the overall energy loss of the motor is relatively high; (2) The energy storage unit only contains batteries. Because of its high energy density and low power density, the charging and discharging time of the battery is long, and the dynamic response speed of the electrical system is slow (3) Its electrical drive method corresponding to generators, electric motors, and internal combustion engines is not conducive to the effective flow of energy in the system, and its electrical drive system has low efficiency and high energy consumption

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