Vehicle-mounted charger charging and discharging control method and system and hybrid vehicle

Abstract

The invention provides a vehicle-mounted charger charging and discharging control method. The vehicle-mounted charger charging and discharging control method comprises the following steps of obtainingthe remaining capacity value of a power battery under a vehicle-mounted charger charging condition; when the remaining capacity value is less than or equal to a first preset capacity value, limitingthe power of a high voltage accessory of a hybrid vehicle; and when the remaining capacity value of the power battery is larger than or equal to a second preset capacity value, gradually releasing thelimitation on the power of the high voltage accessory according to charging current of the power battery during charging under a situation of guaranteeing that the power battery is in a charging state, wherein the second preset capacity value is larger than the first preset capacity value. By limiting the power of the high voltage accessory in the charging process, situations that the lower the capacity of the power battery is the more the power battery is charged in the OBC charging process and the power battery is over-discharged are prevented; and therefore, the current entering the powerbattery is increased so that the charging efficiency of the power battery is enhanced and the power battery is protected.

Description

technical field [0001] The invention relates to the technical field of charging and discharging control of vehicle hybrid electric vehicles, in particular to a charging and discharging control method and system of an on-board charger and a hybrid electric vehicle. Background technique [0002] With the development of the automobile industry and the deepening of people's awareness of environmental protection, new energy vehicles will surely become the mainstream of the market. In the development process of new energy vehicles, as a transitional product from traditional fuel vehicles to pure electric vehicles, the development of hybrid vehicles has decisive strategic significance. [0003] On board charger (OBC) AC charging is an important source of power battery charging in plug-in hybrid electric vehicles. In the prior art, the charging time of the power battery is shortened by controlling the input current of the OBC charging gun. When the power battery is sufficient duri...

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Problems solved by technology

[0004] An object of the present invention is to solve the problem that the OBC charging control method in the prior art cannot realize the gradual increase of power battery power when the power battery power is low, so that the charging efficiency of the power battery cannot be really improved.

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