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Internal combustion engine

A technology for internal combustion engines and nozzles, applied to internal combustion piston engines, combustion engines, mechanical equipment, etc., can solve problems such as nozzle hole corrosion

Inactive Publication Date: 2015-09-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventionally, it has been known that moisture containing acid condenses on the tip of a nozzle of an injector injecting fuel into a cylinder of an internal combustion engine, and the condensed water adheres to the tip of the nozzle. Orifice corrosion at tip

Method used

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  • Internal combustion engine
  • Internal combustion engine
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no. 1 approach

[0045] figure 1It is an explanatory diagram showing a schematic configuration of the internal combustion engine 100 of the first embodiment. The fuel injection device 1 is attached to the internal combustion engine 100 . The internal combustion engine 100 is an internal combustion engine implementing in-cylinder injection, more specifically, a diesel internal combustion engine. The internal combustion engine 100 is a four-cylinder. The internal combustion engine 100 includes an engine main body 101 including a cylinder head 101 a and a cylinder block 101 b, and the engine main body 101 includes #1 cylinders to #4 cylinders. The fuel injection device 1 is mounted on the internal combustion engine 100 . The fuel injection device 1 includes #1 injectors 107-1 to #4 injectors 107-4 corresponding to #1 cylinders to #4 cylinders. Specifically, the #1 injector 107-1 is attached to the #1 cylinder, and the #2 injector 107-2 is attached to the #2 cylinder. #3 injector 107-3 is att...

no. 2 approach

[0079] Next, refer to Figure 8 , Figure 9 , and the second embodiment will be described. Figure 8 It is a flowchart showing an example of the control of the internal combustion engine 100 in the second embodiment, specifically, the idle extension control. Figure 9 (A), Figure 9 (B) is a graph showing changes in nozzle tip temperature due to idle speed extension.

[0080] The second embodiment differs from the first embodiment in the content of the nozzle corrosion prevention control (control for reducing the heat dissipation rate of the nozzle) executed by the ECU 111 . In the second embodiment, instead of the idling execution control in the first embodiment, idling extension control is implemented instead. which is, Figure 4 The contents of steps S1 to S8 in the shown flowchart are the same as those in the first embodiment. Since the basic structure of the internal combustion engine 100 is the same as that of the first embodiment, a detailed description thereof wi...

no. 3 approach

[0094] Next, refer to Figure 10 to Figure 13 , and the third embodiment will be described. Figure 10 It is a block diagram showing main parts of the internal combustion engine 100 of the third embodiment. Figure 11 It is a flowchart showing an example of control of the internal combustion engine 100 in the third embodiment. Figure 12 It is an explanatory diagram schematically showing the cooling of the piston in the third embodiment. Figure 13 (A), Figure 13 (B) is a graph showing the effect of piston cooling.

[0095] when referring to Figure 10 and Figure 12 In this case, the internal combustion engine 100 of the third embodiment includes, as its main part, an electric oil pump 121 electrically connected to the ECU 111 . Such as Figure 12 As shown, the electric oil pump supplies oil to the oil injection hole 122 for cooling the piston 101c housed in the cylinder block 101b. The oil injection hole 122 is provided on each cylinder, and injects oil to the cooli...

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Abstract

An internal combustion engine equipped with a control unit, which determines whether condensation has occurred at the tip of the nozzle of an injector, on the basis of the amount of heat received by the nozzle when the ignition is turned off and the temperature at the tip of the nozzle, and which executes a nozzle corrosion prevention control when it has been determined that condensation has occurred at the nozzle tip. The control unit calculates the rate of decrease of the nozzle tip temperature on the basis of the amount of heat received by the nozzle and calculates the time at which condensation will occur on the basis of the rate of decrease, and determines whether condensation has occurred at the nozzle tip on the basis of the calculated condensation time.

Description

technical field [0001] The invention relates to an internal combustion engine. Background technique [0002] Conventionally, it has been known that moisture containing acid condenses on the tip of a nozzle of an injector injecting fuel into a cylinder of an internal combustion engine, and the condensed water adheres to the tip of the nozzle. The nozzle hole at the tip portion is corroded. Whether dew condensation occurs on the tip of the nozzle is affected by the relationship between the temperature at the tip of the nozzle and the dew point of the atmosphere in the cylinder. From this point of view, Patent Document 1 proposes a method of estimating the nozzle tip temperature and adjusting the EGR amount based on the estimated nozzle tip temperature to reduce corrosion. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2010-255462 Contents of the invention [0006] The problem to be solved by the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22F01P3/08F01P3/20F01P7/16F02M53/04F02M61/16
CPCF02M53/04F02M2200/05F02D41/042Y02T10/40F02D35/025F02D35/0007F01P7/14G01N25/66
Inventor 池本雅里中川政善松本崇志山下芳雄
Owner TOYOTA JIDOSHA KK
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