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Method of controlling internal combustion engine

一种控制方法、内燃机的技术，应用在发动机控制、燃料喷射控制、内燃活塞发动机等方向，能够解决可靠性降低、出来白烟等问题，达到防止白烟、抑制波动和白烟增大、降低噪音的效果

Inactive Publication Date: 2009-09-16
YANMAR POWER TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although it is known that the reduced-cylinder operation is effective in reducing white smoke, the reduced-cylinder operation with only specific cylinder injection has a temperature deviation (temperature difference) between the operating cylinder and the stopped cylinder, and the reliability is reduced. Problems such as white smoke coming out from the stopped cylinder when the cylinder is reduced

Method used

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  • Method of controlling internal combustion engine
  • Method of controlling internal combustion engine
  • Method of controlling internal combustion engine

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Embodiment Construction

[0045] Next, embodiments of the invention will be described.

figure 1 It is a schematic configuration diagram of the control system of the direct injection diesel engine related to the present invention, figure 2 is a diagram representing the engine control flow, image 3 It is a graph showing the generation characteristics of white smoke during normal operation, Figure 4 is a diagram showing an example of the operation control with reduced cylinders, Figure 5 It is a graph showing the relationship between the cooling water temperature before starting and the white smoke density, Image 6 It is a graph showing the generation characteristics of white smoke during operation with reduced cylinders, Figure 7 It is a graph showing the time change of the temperature in the combustion chamber, Figure 8 It is a graph showing the relationship between the arrival distance of fuel and time when fuel is injected by single-stage injection, Figure 9 It is a diagram showing the ...

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Abstract

A method of controlling an internal combustion engine, in which engine operation with a reduced number of cylinders is controlled according to an idling speed after starting the engine to thereby minimize discharge of white smoke during a time lag for temperature equilibrium immediately after a cold start. The method uses a coolant temperature detection means (10) for detecting the temperature of the coolant of the internal combustion engine (1), an engine speed detection means (12) for detecting the speed of the engine, and control means (5) for controlling operation of the engine according to the temperature of the coolant and the engine speed. When the engine is determined to be in a cold start, engine operation with a reduced number of cylinders is started, and in this engine operation, fuel is injected into the cylinders for a predetermined time period after the speed of the engine reaches a predetermined level after the start of the engine.

Description

technical field [0001] The present invention relates to a control method of an internal combustion engine capable of reducing white smoke emission immediately after the engine is started in a cold state. Background technique [0002] Conventionally, in a direct-injection diesel engine, etc., white smoke with a pungent smell is emitted when starting at a low temperature. Therefore, as a countermeasure against this, the number of cylinders that perform fuel injection is reduced so that the number of cylinders that perform fuel injection is reduced. The technique of increasing the fuel injection amount in the cylinder to increase the combustion temperature in the combustion chamber and reduce white smoke is known (for example, refer to Patent Document 1 and Patent Document 2). In addition, as a cause of white smoke at startup, for example, the tendency of white smoke to be emitted from a direct-injection diesel engine is largely related to the temperature of the wall surface o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D17/02F02D41/06F02D9/02F02D41/38F02D9/04F02D43/00F02D41/04F02D45/00
CPCF02D41/064Y02T10/44F02D41/0087F02D41/402F02D17/02F02D41/403F02B29/0493Y02T10/40
Inventor 朝井豪足立仁高川功宫本贵志
Owner YANMAR POWER TECHNOLOGY CO LTD
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