Extended-range hybrid power control method

Abstract

The invention relates to the technical field of motor control, in particular to an extended-range hybrid power control method. The method comprises the steps of determining a plurality of operative rated revolving speed values of an engine and dividing a plurality of range extender target electricity generation power ranges according to the operative rated revolving speed values of the engine; calculating range extender target electricity generation power Pr in real time according to Pbty, Pmot and Pcoun; comparing the range extender target electricity generation power Pr with the range extender target electricity generation power ranges, and determining the range extender target electricity generation power ranges to which the range extender target electricity generation power Pr belongsand the corresponding operative rated revolving speed values of the engine; adjusting the output of an range extender in real time according to the range extender target electricity generation power Pr so as to lead the range extender to operate in rated revolving speed and torque-changing states. By the method, the operative rated revolving speed values of the engine are set, the plurality of range extender target electricity generation power ranges are divided according to the operative rated revolving speed values of the engine to lead the range extender to operate in the rated revolving speed and torque-changing states, the power balance is realized, and the range extender responds quickly.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a range-extended hybrid power control method. Background technique [0002] At present, for extended-range hybrid electric vehicles, the control of the energy balance of the vehicle mainly focuses on two methods: figure 1 As shown, the thermostat method (the engine works at a single point, multi-point); such as figure 2 As shown, the power following method (the engine follows the power requested by the motor, the engine is always in the best economic power line, and the operating speed and torque of the engine meet the load demand, that is, the speed and torque are changing all the time). [0003] Disadvantages of the thermostat: the engine runs at a single point or multiple points. Although the engine can run at the optimal operating point, the target power generation Pr of the range extender is a fixed value, and the working power Pmot of the motor varies with the actua...

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Problems solved by technology

[0003] Disadvantages of the thermostat: the engine runs at a single point or multiple points. Although the engine can run at the optimal operating point, the target power generation Pr of the range extender is a fixed value, and the working power Pmot of the motor varies with the actual vehicle operating conditions. Fluctuations, the working power Pcoun of accessories also fluctuates, which causes the working power Pbty of the battery to fluctuate irregularly, so that the current charged to the battery fluctuates greatly

[0004] Disadvantages of power following: the operating point of the range extender will change with the load change, and the load change is complicated, resulting in irregular optimal economic curve of the engine. When the target power generation Pr of the range extender changes, the engine speed N and torque Both T and current are uncontrolled, resulting in large current fluctuations

In terms of response speed, although the generator of the range extender can respond quickly, it is difficult for the engine of the range extender to respond quickly due to the slow change of engine speed

This makes it difficult for the range extender to achieve power following in all working conditions. The current power following range extender is not effective.

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