Range extender engine damping method and device, range extender and vehicle

Abstract

The invention discloses a range extender engine damping method and device, a range extender and a vehicle. The method comprises the steps that according to the fluctuation difference value between thereal-time torque obtained when an engine works at the stable work point and the target torque that the engine works at the stable work point, based on the fluctuation difference value, the optimal solution of the torque compensation value is searched through the experiment, and the torque compensation value is obtained. According to the torque compensation value and the target torque of a power generator, the output torque of the power generator is calculated, the output torque of the power generator is a rectangular wave curve, and the torque compensation value is the amplitude of the rectangular wave curve. The torque compensation curve is rectangular waves, the maximum torque of the rectangular wave torque curve is reduced, the torque fluctuation range is narrowed accordingly, the power generator more works in efficient areas, accordingly, in the process that mechanical energy is converted into electric energy, energy losses are few, and the power generation efficiency is high.

Description

technical field [0001] The invention relates to the field of range extenders, in particular to a vibration reduction method and device for a range extender engine, a range extender and a vehicle. Background technique [0002] With the severe situation of global energy and environment, new energy vehicles represented by pure electric vehicles, hybrid vehicles and fuel cell vehicles have become an important direction of future automobile development. Among them, pure electric vehicles mainly have the disadvantages of high cost, weak battery life, long charging time, and short service life. To solve these problems, high-efficiency range extender products are gradually emerging. [0003] When the range extender is in the power generation condition, the torque fluctuation of the engine within a working cycle is relatively large, which will cause large vibration and noise. This defect is difficult to completely overcome on the traditional automobile that purely adopts engine as p...

AI Technical Summary

Problems solved by technology

However, in this method, the output torque of the generator changes from a straight line to a fluctuating curve that changes from time to time. To achieve better noise, vibration and harshness targets, the maximum output torque of the motor needs to be greatly increased, and the output torque fluctuation range is greatly increased. , which causes the working range of the motor to fluctuate back and forth between the high-efficiency region and the low-efficiency region

Compared with the generator only working in the high-efficiency zone when the motor outputs a fixed torque, it increases the energy loss of the system during the conversion process from mechanical energy to electrical energy and reduces the power generation efficiency

Images