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Control devices for internal combustion engines

A technology for control devices and internal combustion engines, applied to control devices for cooling devices, engine control, fuel injection control, etc., can solve problems that cannot be effectively eliminated, and achieve suppression of pre-ignition, omission of detection mechanisms, and simplification of control systems and sensor systems Effect

Active Publication Date: 2016-08-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the prior art described above, the occurrence of pre-ignition can be detected based on the wall surface temperature of the combustion chamber, but there is a problem that even if the wall surface temperature becomes a state where pre-ignition is likely to be induced, this state cannot be effectively eliminated.

Method used

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  • Control devices for internal combustion engines
  • Control devices for internal combustion engines
  • Control devices for internal combustion engines

Examples

Experimental program
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Effect test

Embodiment approach 1

[0057] [Structure of Embodiment 1]

[0058] Below, refer to figure 1 and Figure 8 Embodiment 1 of the present invention will be described. figure 1 It is an overall configuration diagram for explaining the system configuration of Embodiment 1 of the present invention. The system of the present embodiment is equipped with an engine that is a multi-cylinder internal combustion engine. In addition, in figure 1 In , only one cylinder of the engine 10 is shown. In addition, the present invention is applicable to an engine having any number of cylinders including a single cylinder. In each cylinder of the engine 10, a combustion chamber 14 is demarcated by a piston 12, which is connected to a crankshaft 16 of the engine. Also, the engine 10 is equipped with an intake passage 18 for taking intake air into the combustion chamber 14 (inside the cylinder) of each cylinder, and an exhaust passage 20 for discharging exhaust gas from each cylinder.

[0059] Intake passage 18 is pro...

Embodiment approach 2

[0091] Second, refer to Figures 9 to 11 , Embodiment 2 of the present invention will be described. The present embodiment is characterized in that, in addition to the same configuration and control as in the above-mentioned embodiment, control corresponding to a change in fuel properties is also performed. In addition, in this embodiment, the same code|symbol is attached|subjected to the same component as Embodiment 1, and the description is abbreviate|omitted.

[0092] [Features of Embodiment 2]

[0093] As described above, in particular, the relationship between the cylinder wall temperature at low temperature and the frequency of occurrence of pre-ignition is greatly influenced by the occurrence of fuel dilution (volatility of fuel). That is, the Figure 4 The shown characteristic line (temperature lower limit value t1 and temperature upper limit value t2) is obtained based on a certain reference state such as the case of gasoline (the alcohol concentration in the fuel ...

Embodiment approach 3

[0106] Second, refer to Figure 12 , Embodiment 3 of the present invention will be described. The present embodiment is characterized in that only the lower limit value of the temperature in the pre-ignition suppression temperature region is made variable in the same structure and control as in the first embodiment described above. In addition, in this embodiment, the same code|symbol is attached|subjected to the same component as Embodiment 1, and the description is abbreviate|omitted.

[0107] [Feature of Embodiment 3]

[0108] Originally, it is preferable that the temperature upper limit t2 of the pre-ignition suppression temperature region be set based on the occurrence frequency of pre-ignition. However, due to, for example, the structural characteristics of the engine or the surrounding temperature environment (heat resistance, etc.), it may be difficult to shift the cylinder wall temperature t to a high temperature side higher than the temperature upper limit value t2...

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Abstract

An object of the present invention is to appropriately control the wall surface temperature of the combustion chamber based on a target temperature range reflecting the occurrence frequency of pre-ignition to suppress the occurrence of pre-ignition even if pre-ignition does not actually occur. The ECU (50) acquires the wall surface temperature of the combustion chamber (14) or the related engine water temperature, etc., as a wall temperature parameter. In addition, the ECU (50) has data on a pre-ignition suppression temperature region in which the occurrence frequency of pre-ignition is minimized in the temperature region of the wall temperature parameter. Then, in the operation region (A) where preignition is likely to occur, the wall temperature parameter is controlled to fall within the preignition suppression temperature region by operating the cooling water amount variable mechanism (38). Therefore, even if pre-ignition does not actually occur, the effect of suppressing pre-ignition can be obtained only by temperature control of the wall temperature parameter without providing a mechanism for detecting pre-ignition.

Description

technical field [0001] The present invention relates to a control device for an internal combustion engine, and more particularly, to a control device for an internal combustion engine that implements control corresponding to pre-ignition (self-ignition before ignition). Background technique [0002] As a prior art, for example, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 11-36965), there is known a control of an internal combustion engine having a function of detecting the occurrence of pre-ignition based on the temperature (wall surface temperature) in the combustion chamber. device. [0003] In addition, the applicant knows the documents described below including the above-mentioned documents as documents related to the present invention. [0004] patent documents [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 11-36965 [0006] Patent Document 2: Japanese Unexamined Patent Publication No. 2003-83127 [0007] Pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00F01P7/14F01P7/16F02D35/00F02D41/22
CPCF02D35/025F02D35/026F02D2200/021F01P7/167F01P2025/31F01P2037/00
Inventor 森田祐辅村上元一矢口宽北山武志
Owner TOYOTA JIDOSHA KK
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