Engine Torque Fluctuation Compensation Method Based on Regular Curve Compensation Control Method

Abstract

The invention discloses an engine torque fluctuation compensation method based on a regular curve compensation controlling method. The engine torque fluctuation compensation method based on the regular curve compensation controlling method comprises the following steps that an ISG system outputs the requirement torque Te*of an automobile to the ISG system; the ISG system obtains the engine compensation torque Te1 at the current position according to the current position of a motor rotor; a compound torque Te2 is obtained; whether the compound torque Te2 exceeds the largest torque of the electric state of the ISG system is judged; if the compound torque Te2 exceeds the largest torque of the electric state of the ISG system, an ISG system actual output torque Te3 is controlled to be equal to the Te(n) Max; if the compound torque Te2 does not exceed the largest torque of the electric state of the ISG system, whether the compound torque Te2 is smaller than the peak torque of the power-generating state of the ISG system is judged; if the compound Te2 is smaller than the peak torque of the power-generating state of the ISG system, the ISG system actual output torque Te3 is equal to the Te(n) Min; if the compound Te2 is not smaller than the peak torque of the power-generating state of the ISG system, the ISG system actual output torque Te3 is equal to the Te2. The engine torque fluctuation compensation method based on the regular curve compensation controlling method can carry out restraining and compensation on engine torque fluctuation, and therefore vibration and noise of a hybrid electric vehicle power assembly system are reduced.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to an engine torque fluctuation compensation method based on a regular curve compensation control method. Background technique [0002] The grim situation of global energy and the environment, especially the huge impact of the international financial crisis on the automobile industry, has pushed countries around the world to accelerate the strategic transformation of transportation energy. New energy vehicles represented by hybrid vehicles, pure electric vehicles and fuel cell vehicles have become the future vehicles important direction of development. [0003] As electric vehicles are currently facing difficulties such as short driving range, expensive batteries, and imperfect infrastructure, it will take a considerable period of effort to gradually solve them; while hybrid vehicles have better industrialization conditions at this stage, hybrid vehicles Power vehicles ar...

AI Technical Summary

Problems solved by technology

[0004] The torque fluctuation of a traditional engine within a working cycle is relatively large. Taking the four-cylinder engine most commonly used in domestic compact cars as an example, such as Figure 1 The approximate torque waveform curve of one revolution (360 degrees) of the engine shown, the average torque is 150Nm, but the torque conversion changes from 530N to -110Nm, the torque fluctuation is large, causing large vibration and noise, and affecting system efficiency

This defect is difficult to completely overcome in traditional cars that simply use the engine as the powertrain.

The torque control of the traditional ISG (Integrated Starter and Generator) system adopts the way that the output torque follows the command torque. In one engine cycle, the output torque of the ISG system is approximately a straight line. The above defects have not been improved in any way, and because of the vibration and noise of the motor system itself, the vibration and noise of the hybrid electric vehicle power system equipped with the ISG system are even higher than the vibration and noise of the traditional vehicle power system

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