Hybrid electric vehicle engine rotating speed reset control method

Abstract

The invention belongs to the technical field of automobile control systems, and discloses a hybrid electric vehicle engine rotating speed reset control method which comprises the steps of S1, calculating the recovery power P2 _ rev of a driving motor; S2, if the recovery power P2 _ rev of the driving motor is greater than or equal to the limit recovery power P2 _ lim of the driving motor, skippingto S9; otherwise, skipping to S3; S3, calculating the recovery power Prev of the whole vehicle; S4, if the vehicle recovery power Prev is greater than or equal to the current limit charging power Pbat _ lim of the battery, skipping to S9; otherwise, skipping to S5; S5, obtaining the target rotating speed ne of the engine according to the speed regulation step length delta n; S6, obtaining the target torque Te of the engine and the target torque T1 of the adjustable-speed motor; S7, adjusting the rotating speed of the engine to the target rotating speed ne of the engine through a PID control method; S8, repeating the steps S5-S7 until the rotating speed of the engine is reduced to an idling interval; and S9, controlling the rotating speeds of the engine and the adjustable-speed motor to bezero at the same time until the rotating speed of the engine is reduced to the idling interval. The rotating speed of the engine is controlled by comprehensively considering the recycling capacity ofthe driving motor and the battery charging requirement.

Description

Technical field [0001] The invention relates to the technical field of automobile control systems, in particular to a method for resetting the engine speed of a hybrid electric automobile. Background technique [0002] During the running of the existing vehicle, when the accelerator is released or the brake is stepped on, the fuel supply to the engine is directly stopped to reduce the engine speed and stop the power output. If after the engine speed drops rapidly, when the vehicle resumes power demand within a short time, it will take a certain time for the engine to increase from a lower speed to the target speed, resulting in an instantaneous lack of power and frequent changes in engine speed, which will affect Engine life and vehicle fuel economy are also low. Summary of the invention [0003] The purpose of the present invention is to provide a method for resetting the engine speed of a hybrid electric vehicle, which prevents the vehicle from being momentarily underpowered an...

AI Technical Summary

Problems solved by technology

If the engine speed drops rapidly and the vehicle resumes its power demand within a short period of time, it will take a certain amount of time for the engine to rise from a lower speed to the target speed, resulting in an instantaneous lack of power, and frequent changes in the engine speed will affect Engine life, vehicle fuel economy is also lower

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