Energy management system of externally charging typed hybrid power vehicle

Abstract

The invention discloses an energy management system of an external charging-type hybrid power vehicle. The energy management system comprises a battery part, a battery charging and discharging and voltage regulating circuit and a signal acquisition and control part. The battery part comprises a lithium power battery pack 11, a voltage monitoring circuit 12 of each unit of the battery and a current detection and cut-off circuit 13 of the battery pack; the battery charging and discharging and voltage regulating circuit comprises an input contactor or an input breaker 21, a charging resistor 23, a short-circuit contactor 22, a voltage boosting reactor 24, a charging control switch IGBT 25, a voltage boosting control switch IGBT 26 and an output contactor 27; and the signal acquisition and control part comprises a main control unit 40, a voltage sensor 41, an output terminal voltage sensor 42, a direct current bus charging indicating circuit 43 and an output current sensor 44. The energy management system enlarges the distance of electric running, reduces idle speed, saves energy, reduces emission, strengthens the dynamic and fuel economic properties of vehicles, reduces the needs of the charging and the discharging with high multiplying power to a lithium battery and has high reliability and very low cost.

Description

1. Technical field [0001] The invention relates to an energy management system in the field of electric vehicles, in particular to an energy management system for a hybrid battery of an externally charged hybrid electric vehicle. 2. Background technology [0002] A pure electric vehicle refers to a vehicle that is driven entirely by electric energy, regardless of whether it uses a lead-acid battery, a nickel-hydrogen battery or a lithium-powered battery, its energy is completely provided by the battery. Due to the limited energy density and cycle life of the battery, no matter its electric mileage or battery life, it cannot always meet the needs of users. There is little market prospect for commercialization, except for purpose-built electric city small cars. Hybrid electric vehicles are the crystallization of the combination of internal combustion engine technology and pure electric vehicle power electronics technology through system integrated control technology. However...

AI Technical Summary

Problems solved by technology

The supercapacitor is boosted by the DC power converter DC / DC and connected in parallel with the power battery. Although this method can meet the control requirements of the hybrid vehicle for output power and energy, the output power of the supercapacitor is affected by the DC power converter DC / DC. Due to the limitation of DC design, it is often impossible to give full play to the advantages of high specific power of supercapacitors

When the acceleration current or braking feedback current of the hybrid vehicle is much larger than the normal operating current, the conversion power provided by the DC power converter DC / DC cannot meet the requirements, and the fuel needs to be burned when the vehicle accelerates. , still fail to meet the requirements of protecting the vehicle power system

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