Intake Control Method of Direct Injection Gasoline Engine

A technology of a gasoline engine and a control method, which is applied to a control device for improving the performance of an in-cylinder direct-injection gasoline engine, improves the performance of an in-cylinder direct-injection gasoline engine, and in the field of air intake control, and can solve complex airway structures, increased pumping losses, The working environment is harsh and other problems, to achieve the effect of increasing the flame propagation rate, reducing combustion fluctuations, and improving the mixing process

Active Publication Date: 2021-08-17
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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  • Intake Control Method of Direct Injection Gasoline Engine
  • Intake Control Method of Direct Injection Gasoline Engine
  • Intake Control Method of Direct Injection Gasoline Engine

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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 air intake control method, comprising: setting a Karman vortex generator on the airflow channel of the direct-injection gasoline engine intake system; The actual Reynolds number of the airflow; judge whether the actual Reynolds number falls within the preset Reynolds number range, if the judgment result is yes, then open the described Karman vortex generating device, so that the airflow in the intake system passes through the Karman vortex The Karman vortex street phenomenon is generated by the street generating device, and if the judgment result is negative, the Karman vortex street generating device is closed. This method can increase the turbulence level of the fluid entering the cylinder, thereby enhancing the airflow movement in the cylinder, improving the fuel-air mixing process, increasing the flame propagation rate, improving engine performance, and at the same time, reducing hydrocarbon (HC) and particulate emissions. The invention also discloses a direct-injection gasoline engine air 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 Patents(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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