Control method and system for adjusting rotating speed stability of range extender

A technology of a control method and a control system, which is applied in the field of a control method and a system for adjusting the speed stability of a range extender, and can solve problems such as speed overshoot, engine torque not being able to keep up, and longer time for the range extender to stabilize its operating conditions, etc. Achieve the effects of offsetting impact, eliminating the speed of torque response and torque difference, and improving running stability

Active Publication Date: 2020-06-12
ZHEJIANG GEELY NEW ENERGY COMML VEHICLES CO LTD +3
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following deficiencies: 1) How to quickly adjust the range extender when signal interference is not considered; 2) When multiple operating point transitions, relying solely on engine speed control and generator torque control cannot quickly meet the power point

Method used

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  • Control method and system for adjusting rotating speed stability of range extender
  • Control method and system for adjusting rotating speed stability of range extender
  • Control method and system for adjusting rotating speed stability of range extender

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Embodiment Construction

[0053] figure 1 A schematic flowchart of a control method for adjusting the rotational speed stability of a range extender according to an embodiment of the present invention is shown. The range extender includes an engine, a generator and a flywheel. Such as figure 1 As shown, the control method includes:

[0054] Step S100, outputting the target speed n of the engine according to the power request of the whole vehicle set and the target torque T of the generator set ;

[0055] Step S200, set the target torque T of the generator set as feedforward torque T forward , and make the engine respond to the feed-forward torque so that the engine speed approaches the target speed;

[0056] Step S300, when the engine speed is close to the target speed, maintain the engine within the target speed according to the PID speed closed-loop control.

[0057] In step S100, first receive the power request of the whole vehicle, and then output the target speed n of the engine according ...

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Abstract

The invention provides a control method and system for adjusting rotating speed stability of a range extender. The control method comprises the following steps that: the target rotating speed nset ofthe engine and the target torque Tset of the generator are output according to a power request of a whole vehicle; the target torque Tset of the generator is taken as a feed-forward torque Tforward, and the engine responds to the feed-forward torque so as to enable the rotating speed of the engine to be close to the target rotating speed; and when the rotating speed of the engine is close to the target rotating speed, the engine is maintained within the target rotating speed according to PID rotating speed closed-loop control. Through the generator real-time torque compensation control methodand PID rotating speed closed-loop accurate control, the rotating speed of the range extender can be continuously and stably output under the target power, the fluctuation of the rotating speed of theengine is reduced, and then the purposes of reducing vibration of a range extender system and improving the overall NVH performance of the range extender are achieved.

Description

technical field [0001] The present invention relates to the technical field of new energy vehicles, in particular to a control method and system for adjusting the speed stability of a range extender. Background technique [0002] With the promotion of new energy technologies, range-extended electric vehicles have become more and more popular. Different from traditional pure electric vehicles, the biggest advantage of range-extended electric vehicles is their long cruising range, and its core components are mainly range extenders composed of engines, generators and their controllers. [0003] Although the appearance of the range extender can better solve the problem of the short cruising range of pure electric vehicles, the premise is to ensure that the range extender can continuously and stably output power. Among them, the speed stability of the range extender directly affects whether the range extender can work stably. Considering the harsh working conditions of the rang...

Claims

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Application Information

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IPC IPC(8): B60L50/62B60L15/20
CPCB60L50/62B60L15/20Y02T10/62Y02T10/72Y02T10/70
Inventor 冯伟陈定邦马帅营徐秀华王一戎
Owner ZHEJIANG GEELY NEW ENERGY COMML VEHICLES CO LTD
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