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A Method for Determining Scavenging Activation Conditions of Supercharged Direct Injection Engines

A determination method and engine technology, applied in the direction of engine control, machine/engine, electrical control, etc., can solve problems such as unreasonable emissions and exhaust temperature, and achieve the effect of improving power performance and preventing unstable combustion control.

Active Publication Date: 2021-07-23
DONGFENG MOTOR CORP HUBEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present application provides a method for determining the scavenging activation condition of a supercharged direct injection engine, so as to solve the problems of excessive emissions and exhaust temperature caused by unreasonable scavenging in the related art

Method used

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  • A Method for Determining Scavenging Activation Conditions of Supercharged Direct Injection Engines
  • A Method for Determining Scavenging Activation Conditions of Supercharged Direct Injection Engines
  • A Method for Determining Scavenging Activation Conditions of Supercharged Direct Injection Engines

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Embodiment 1

[0042] figure 1It is a flow chart of the determination method of this embodiment. The determination method mainly includes: firstly determining the scavenging request working condition of the supercharged direct injection engine, and simultaneously determining the scavenging allowable working condition of the supercharged direct injection engine, combining the above two working conditions Comprehensive judgment is made according to the conditions. If the supercharged direct injection engine meets the scavenging request condition and the scavenging allowable condition at the same time, the supercharged direct injection engine will be activated immediately to enter the scavenging activation condition. If the supercharged direct injection engine only meets the scavenging condition If it is one of the request working condition or the scavenging allowed working condition, it is further judged whether the corresponding process control of the supercharged direct injection engine is wi...

Embodiment 2

[0046] figure 2 It is the flow chart of the determination method of this embodiment. The difference between this embodiment and Embodiment 1 is that the specific steps of determining the scavenging request working condition of the supercharged direct injection engine include: firstly, it is judged whether the supercharging capacity of the turbo reaches the standard, and at the same time Then determine whether the high torque request flag of the throttle is activated. If the supercharging capacity of the turbo is not up to the standard, and the high torque request flag of the throttle is activated, it is determined that the supercharged direct injection engine meets the scavenging request condition. If the capacity reaches the standard, and / or the high torque request flag of the throttle is not activated, it is determined that the supercharged direct injection engine does not meet the scavenging request condition.

Embodiment 3

[0048] image 3 It is a flow chart of the determination method of this embodiment. The difference between this embodiment and Embodiment 1 is that the specific steps of judging whether the high torque request flag of the throttle is activated include: judging the opening percentage of the throttle and the first preset opening percentage and the size of the second preset opening percentage. If the opening percentage of the accelerator is greater than or equal to the first preset opening percentage, it means that the driver has a large torque request, and then it is determined that the high torque request flag of the accelerator is activated; if the opening percentage of the accelerator is less than the second preset opening percentage, If the driver does not have a large torque request, it is determined that the high torque request flag of the accelerator is not activated. If the opening percentage of the accelerator is less than the first preset opening percentage and greater ...

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Abstract

The present application relates to a method for determining the scavenging activation working condition of a supercharged direct injection engine, and relates to the field of engine control. This determination method includes firstly determining the scavenging request working condition of the supercharged direct injection engine, and secondly determining the scavenging allowable working condition of the supercharged direct injection engine. If the supercharged direct injection engine only meets one of the scavenging request conditions or the scavenging allowable conditions, the supercharged direct injection engine will be further judged. Whether the corresponding process control is within the control of the scavenging activation condition, if so, activate the supercharged direct injection engine for at least the first preset time T1 and then exit the scavenging activation condition, if not, then activate the supercharged direct injection engine The engine immediately exits the scavenging request mode. The determination method provided in the present application solves the problem of excessive discharge and exhaust temperature caused by unreasonable scavenging in the related art.

Description

technical field [0001] The present application relates to the field of engine control, in particular to a method for determining the scavenging activation condition of a supercharged direct injection engine. Background technique [0002] With the increasingly serious energy problems and environmental pollution, corresponding countries have introduced a series of energy-saving and emission-reduction measures to introduce stricter emission regulations for the automobile industry, which has also promoted the innovation of engine technology. At present, due to direct injection, Supercharged miniaturized engines have the advantages of high efficiency and low pollution, and have gradually become the current mainstream. [0003] The scavenging function of the supercharged direct injection engine refers to the use of a specific valve overlap angle. During the valve opening overlap period, due to the effect of the intake and exhaust pressure difference, the fresh air flows directly f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/04
CPCF02D41/0007F02D41/04
Inventor 秦龙刘磊翟刚
Owner DONGFENG MOTOR CORP HUBEI
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