Control method and device for hybrid power supply stroke-adding type electric vehicle

Abstract

The invention relates to the field of stroke-adding type electric vehicles and aims at providing a control method and device for a hybrid power supply stroke-adding type electric vehicle. The control method and device for the hybrid power supply stroke-adding type electric vehicle comprise an engine, a power generator, a storage battery, a driving motor, a super capacitor, a double control switch, a first switch, a second switch, a frequency converter and a transmission shaft, a revolving shaft of the engine is coaxially connected with a revolving shaft of the power generator, and the input end of the double control switch is in electric connection with the power generator. The control method and device for the hybrid power supply stroke-adding type electric vehicle have the advantages that when a system judges that the electric vehicle is in a high-power-demand-driven state, the power generator is directly connected with the driving motor, the power generator supplies power directly, when the electric vehicle is in a low-power-demand-driven state, the storage battery supplies power, losses caused by energy conversion can be reduced, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of extended-range electric vehicles, in particular to a control method and a control device for a compound power supply extended-range electric vehicle. Background technique [0002] With the widespread promotion of electric vehicles, the mileage of electric vehicles has become the focus of people's attention. However, the high cost and low life of batteries hinder the development of electric vehicles, and the emergence of extended-range electric vehicles has greatly eased the People are anxious about the driving range. It is to install an engine and generator on the car that can increase the driving range. When the battery is fully charged, the engine does not start, and the whole vehicle runs in pure electric form. When the battery SOC is low, The engine is turned on to drive the generator to generate power and supply power to the battery. However, in traditional extended-range vehicle systems, the engine starts onl...

AI Technical Summary

Problems solved by technology

[0002] With the widespread promotion of electric vehicles, the mileage of electric vehicles has become the focus of people's attention. However, the high cost and low life of batteries hinder the development of electric vehicles, and the emergence of extended-range electric vehicles has greatly eased the People are anxious about the driving range. It is to install an engine and generator on the car that can increase the driving range. When the battery is fully charged, the engine does not start, and the whole vehicle runs in pure electric form. When the battery SOC is low, The engine is turned on to drive the generator to generate power and supply power to the battery. However, in traditional extended-range vehicle systems, the engine starts only when the battery SOC is low, and provides energy in the form of charging the battery, so there are the following disadvantages: 1. There are too many energy transfer links, resulting in increased energy loss rate and reduced energy utilization efficiency; 2. The battery is in a low SOC working state within a certain period of time, and the battery discharge efficiency is low and affects the service life of the battery

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