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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
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  • 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, and the tendency of knocking at low speed and heavy load is serious, thus limiting The improvement of ignition advance angle and performance greatly limits the torque output of the engine, which has a great impact on vehicle dynamics and drivability

Method used

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  • Engine control method and device
  • Engine control method and device
  • Engine control method and device

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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...

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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

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Application Information

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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
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