Energy management method and system for a pure electric vehicle

Abstract

The invention relates to an energy management method of a BEV (Blade Electric Vehicles). The method comprises the steps: A, judging whether a driver of a vehicle uses the functions of defrosting and defogging of a vehicle control unit; B, judging whether the vehicle control unit is in a brake energy feedback mode; C, judging whether the vehicle control unit is in a normal drive mode; D, judging whether the maximum discharge power of a power storage battery is greater than or equal to the sum of the demanding power of the driver and the maximum power demand of a high voltage electric accessory; E, judging whether the maximum discharge power of the power storage battery is less than the sum of the demand power of the driver and the maximum power demand of the high voltage electric accessory. The torque demand of the driver can be optimally met by judging the power demand of the driver, the existing state of the power storage battery and other information under the precondition that the vehicle safety cannot be affected, the normal driving of the vehicle can be ensured, and the brake energy feedback can be limited to effectively protect the power storage battery; furthermore, the high-efficiency energy use can be realized, and the power storage battery can be effectively protected at the same time.

Description

technical field [0001] The invention belongs to the field of new energy vehicles, in particular to an energy management method and system for pure electric vehicles. Background technique [0002] Energy saving, environmental protection, and safety are the development directions of future automobiles. How to save energy and improve energy utilization efficiency is an important technology for automobile development. New energy vehicles must not only consume less energy than ordinary fuel vehicles. To achieve zero emissions, it is even more necessary to be able to meet the driver's needs in terms of vehicle power, drivability, and driving range. Currently limited by power battery technology, the energy carried by pure electric vehicles is limited, and the excessive power demand for high-voltage electric accessories may not meet the driver's torque demand, resulting in torque interruption. In extreme cases, it may affect Drive safely. At the same time, when braking energy fee...

AI Technical Summary

Problems solved by technology

Currently limited by power battery technology, the energy carried by pure electric vehicles is limited, and the excessive power demand for high-voltage electric accessories may not meet the driver's torque demand, resulting in torque interruption. In extreme cases, it may affect driving safety

At the same time, when braking energy feedback, too much energy feedback will affect the performance and life of the power battery, and too small energy feedback will not improve energy utilization.

Can not meet the driver's demand for pure electric vehicle power and driving range

When braking energy feedback, too much energy feedback affects the life of the power battery, and too small energy feedback cannot provide energy utilization

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