A power following control method for a range extender for a new energy vehicle

Abstract

The invention discloses a power following control method of a range extender for a new energy vehicle. In order to overcome the problem that the power following algorithm can not follow the optimal control curve well using open-loop control, the use of closed-loop control will slow down the response speed; the present invention adopts the following steps: S1: the vehicle controller calculates the required power; S2: according to The optimal control curve decomposes the required power into target torque and target speed; S3: Send the target torque to the engine controller, and send the target speed to the generator controller; S4: The engine controller close-loop controls the engine to reach the target torque, The generator controller controls the generator in open loop to reach the target speed. Combining open-loop control and closed-loop control, it can not only make the engine follow the optimal control curve well, improve the control accuracy; but also have a good response speed, reduce fuel consumption and emissions, and improve economic performance.

Description

technical field [0001] The invention relates to the field of range extender control, in particular to a power following control method for a range extender for a new energy vehicle. Background technique [0002] At present, the range extender control includes range extender fixed-point control and power following control. [0003] The range extender fixed-point control method uses the same power point under different driving conditions, and uses fixed-point control when the power demand is low, and the remaining energy is used to charge the battery. This approach results in a poor driving experience; using fixed-point control when power demand is low can result in power losses that reduce overall vehicle efficiency and battery life. In the range extender power following control method, the engine queries the fixed curve value or selects several fixed points from the fixed curve value for power following, and controls the torque and speed of the engine and generator through ...

AI Technical Summary

Problems solved by technology

[0005] The invention mainly solves the problem that the open-loop control in the prior art cannot follow the optimal control curve well, and the response speed will be slowed down by using the closed-loop control; it provides a power following control method of the range extender for new energy vehicles, combined with the open-loop Control and closed-loop control, so that the engine can follow the optimal control curve well, and has a good response speed

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