Engine control method and device

A control method and control device technology, applied in engine control, machine/engine, electrical control, etc., can solve the problems of heavy load knocking tendency, engine torque output limitation, high effective compression ratio, etc., to reduce the knocking tendency, reduce In-cylinder temperature, effect of improving performance

Pending Publication Date: 2021-12-07
GREAT WALL MOTOR CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the VVT ​​cannot be activated, the VVT ​​will always be at the default position, that is, the late closing position of the intake valve. At this time, there is almost no Miller effect, so the effective compression ratio will be relatively high,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Engine control method and device
  • Engine control method and device
  • Engine control method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0032] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0033] The engine of the present invention may be a Miller engine. The Miller cycle is a low-temperature cycle that can effectively reduce the tendency of engine knocking and effectively improve the thermal efficiency of the engine. The Miller cycle is characterized by the effective compression ratio of the engine being less than the expansion ratio. Through the strategy of early intake closing (EIVC), the mixture undergoes an expansion process before the start of the compression stroke, and the mixture is internally cooled to reduce the heat load of the engine and reduce the compression work. The EIVC strategy greatly reduces the effective compression ratio of the engine. The e...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the technical field of engines, and provides an engine control method and device. The engine control method comprises the steps that the rotating speed and the load of an engine are detected; whether a variable valve timing mechanism of the engine meets an actuation condition or not is judged; when the variable valve timing mechanism does not meet the actuation condition, the common air-fuel ratio of the engine is controlled to be reduced according to the rotating speed and the load of the engine so as to obtain a first air-fuel ratio; and the engine is controlled to operate at the first air-fuel ratio. The engine performance can be improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine control method and device. Background technique [0002] As a technology based on the original Alto cycle engine, the Miller engine can achieve a significant improvement in thermal efficiency only by changing the cam profile and valve timing position, and is gradually becoming the standard technology for gasoline engines. [0003] Usually the Miller cycle engine is used together with high boost and high compression ratio technology. When the variable valve timing mechanism (Variable Valve Timing, VVT) operates normally, it can be reduced by closing the closing angle of the intake valve in advance. Compression ratio, so as to achieve the purpose of reducing the tendency of knocking. When the VVT ​​cannot be activated, the VVT ​​will always be at the default position, that is, the late closing position of the intake valve. At this time, there is almost no Miller effect, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F02D35/02F02D37/02F02D41/00F02D41/14
CPCF02D35/027F02D41/1475F02D37/02F02D41/0002F02D2041/001
Inventor 张晓辉晏双鹤刘云辉杨金鹏王岩黄松顾亚松董清泉张召胡宇辰
Owner GREAT WALL MOTOR CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap