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Control method and control system for fuel injection quantity during cylinder switch-off mode switching

A technology of mode switching and control methods, applied in fuel injection control, electrical control, engine control, etc., can solve problems such as unstable engine operation, and achieve the effect of reducing operational instability and changing sudden changes

Active Publication Date: 2020-04-17
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to at least solve the problem of unstable operation of the engine when switching operation modes

Method used

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  • Control method and control system for fuel injection quantity during cylinder switch-off mode switching
  • Control method and control system for fuel injection quantity during cylinder switch-off mode switching
  • Control method and control system for fuel injection quantity during cylinder switch-off mode switching

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Embodiment Construction

[0064] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0065] It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated f...

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Abstract

The invention belongs to the technical field of engines, and particularly relates to a control method and control system for the fuel injection quantity during cylinder switch-off mode switching. Thecontrol method for the fuel injection quantity during cylinder switch-off mode switching comprises the following steps: controlling an engine to run in a normal mode, detecting whether a demand of switching to a first cylinder switch-off mode exists or not, and according to the demand of switching to the first cylinder switch-off mode, controlling the engine to switch from the normal mode to the first cylinder switch-off mode and execute a first circulating cylinder switch-off rule; and controlling the fuel injection quantity of the engine to gradually change, and determining the completion ofswitching according to the fact that the fuel injection quantity meets a preset condition. According to the control method for the fuel injection quantity during cylinder switch-off mode switching, when the engine is switched from the normal mode to the cylinder switch-off mode, the fuel injection quantity of fuel injection cylinders of the engine and the fuel injection quantity of switch-off cylinders are controlled to gradually change, and sudden change caused by sudden fuel supply disconnection or sudden fuel supply increase of the fuel injection cylinders in the prior art is changed, so that the operation instability of the whole engine system caused by cylinder switch-off is reduced.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a method and a control system for controlling the fuel injection quantity when the cylinder cut-off mode is switched. Background technique [0002] This section provides background information related to the present disclosure only and is not necessarily prior art. [0003] The operating speed and load range of the engine is very wide, and the fuel economy is poor at low load rates. With the stricter fuel consumption regulations, the demand for reducing the fuel consumption of engines with multiple cylinders and large displacement is becoming more and more urgent. cylinder technology. Cylinder cut-off technology can close one or several cylinders when the engine is partially loaded. In order to ensure that the engine power remains unchanged, it is necessary to increase the load rate of the working cylinders, thereby improving the mechanical efficiency of the engine, ...

Claims

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Application Information

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IPC IPC(8): F02D41/30F02D41/04
CPCF02D41/30F02D41/0087F02D41/04Y02T10/40
Inventor 周荣强张海燕于姗姗李丕茂
Owner WEICHAI POWER CO LTD
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