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Direct injection gasoline engine intake control method and device

The technology of a gasoline engine and a control method is applied to a control device for improving the performance of an in-cylinder direct-injection gasoline engine, improving the performance of an in-cylinder direct-injection gasoline engine, and the field of air intake control, and can solve the problem of increased pump gas loss, harsh working environment, and gas. It can reduce the combustion fluctuation, improve the mixing process, and increase the flame propagation rate.

Active Publication Date: 2019-10-22
SAIC MOTOR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the airway and the harsh working environment, the adjustment mechanism with flaps is very cumbersome and expensive; moreover, the flaps may restrict the flow and cause increased pumping losses

Method used

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  • Direct injection gasoline engine intake control method and device
  • Direct injection gasoline engine intake control method and device
  • Direct injection gasoline engine intake control method and device

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Embodiment Construction

[0039] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Aiming at the problems of low flow level in low-speed and low-load cylinders of in-cylinder direct-injection gasoline engines and high-speed and high-load fuel collisions, the present invention proposes a method that can improve in-cylinder airflow movement and increase in-cylinder turbulence level.

[0041] This method increases the turbulence level of the in-cylinder fluid by creating a Karman vortex street within the intake system, either at the air filter outlet (for non-supercharged engines) or at the hose-intercooler to the throttle inlet. A Karman vortex street generating device is installed on the air flow channel (for supercharged engines), so that the airflow forms a Karman vortex street in the intake pipe. With the ...

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Abstract

The invention discloses a direct injection gasoline engine intake control method. The control method comprises the steps of arranging a Karman vortex street generator on an air flow channel of a direct injection gasoline engine intake system; obtaining the actual Reynolds number of air flow passing through the air flow channel during operation of a direct injection gasoline engine; judging whetherthe actual Reynolds number is within the preset Reynolds number range or not; turning on the Karman vortex street generator if yes, so that the air flow in the intake system forms a Karman vortex street phenomenon through the Karman vortex street generator; and turning off the Karman vortex street generator if not. According to the method, the turbulence level of fluid entering a cylinder can beimproved, so that the air flow in the cylinder is enhanced, and the oil-gas mixing process is improved; and the flame propagation rate and the engine performance are improved, and meanwhile hydrocarbon compounds (HC) and particulate emissions can be further reduced. The invention further discloses a direct injection gasoline engine intake control device.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to an air intake control method for improving the performance of an in-cylinder direct-injection gasoline engine. The invention also relates to a control device for improving the performance of an in-cylinder direct injection gasoline engine. Background technique [0002] Gasoline direct injection technology has the advantages of accurate fuel injection quantity control and precise mixer concentration control, and by directly injecting fuel into the cylinder, it can increase the intake air density and reduce the tendency of knocking, and is currently used by major OEMs widely used. However, when the in-cylinder direct injection gasoline engine operates at low speed and low load, the throttle opening is small, the airflow velocity is small, and the airflow movement level in the cylinder is low, resulting in uneven mixing of fuel and air. During the combustion process, es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B31/06F02D41/00
CPCF02B31/06F02D41/0002F02D2041/0015F02D2200/04Y02T10/12
Inventor 王豪林苇刘旻周杰陈晓霞
Owner SAIC MOTOR
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