Control device for internal combustion engine

A control device and internal combustion engine technology, applied in engine control, internal combustion piston engine, electrical control, etc., can solve problems such as abnormal judgment, and achieve the effect of improving judgment accuracy

Active Publication Date: 2015-01-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in such an internal combustion engine equipped with an EGR system, WGV abnormality cannot be determined based only on supercharging pressure characteristics at the initial stage of supercharging, and there is still room for improvement.

Method used

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  • Control device for internal combustion engine
  • Control device for internal combustion engine
  • Control device for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] [Configuration of Embodiment 1]

[0039] figure 1 It is a figure for demonstrating the system structure which is Embodiment 1 of this invention. Such as figure 1 As shown, the system of this embodiment includes an internal combustion engine (engine) 10 . The intake system of the internal combustion engine 10 includes an intake passage 12 . An air cleaner 14 is installed at the entrance of the intake passage 12 . In addition, an air flow meter 52 for detecting the intake air amount Ga is provided on the downstream side of the air cleaner 14 in the intake passage 12 .

[0040] A turbocharger 20 is provided in the middle of the intake passage 12 . The turbocharger 20 includes a compressor 201 and a turbine 202 . The compressor 201 and the turbine 202 are integrally connected by a connecting shaft. The compressor 201 is rotationally driven by exhaust energy of the exhaust gas input to the turbine 202 . An intercooler 22 for cooling compressed air is arranged downstr...

Embodiment approach 2

[0064] [Features of Embodiment 2]

[0065] Next, refer to Figure 4 , Embodiment 2 of the present invention will be described. The system of this embodiment can use figure 1 The hardware configuration shown, by making ECU50 execute Figure 4 shown in the program to achieve.

[0066] In the system of Embodiment 1 described above, when it is determined whether or not the WGV 32 is operating abnormally, the EGR valve 38 is first opened to a predetermined opening degree. here, as figure 2 As shown, if the EGR valve 38 is normally opened while the WGV 32 is closed, the intake pipe pressure rises. This is because, as described above, when the EGR valve 38 is opened, the EGR flow rate increases.

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PUM

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Abstract

This invention provides a control apparatus for an internal combustion engine that can accurately determine the existence or non-existence of an operational abnormality of a WGV in an internal combustion engine with a turbocharger that is equipped with an EGR system. The internal combustion engine includes a turbocharger 20, a WGV 32 arranged in an exhaust bypass passage 30, an EGR valve 38 arranged in an EGR passage 34, and a pressure sensor 54 that acquires an intake pipe pressure of the internal combustion engine 10. The existence or non-existence of an operational abnormality of the WGV 32 is determined based on a change in an intake pipe pressure when a valve opening request to the WGV 32 is acquired. At such time, the EGR valve 38 is controlled so as to enter a predetermined open state prior to the valve opening request to the WGV 32. Further, the existence or non-existence of an operational abnormality of the EGR valve 38 is also jointly determined based on a change in the intake pipe pressure when a valve opening request to the EGR valve 38 is acquired.

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 a turbocharged internal combustion engine including an EGR system. Background technique [0002] Conventionally, for example, as disclosed in Japanese Patent Laid-Open No. 2008-95587 , there is known a system for detecting poor closing of a wastegate valve (WGV) in an internal combustion engine including a turbocharger. In this system, an index value indicating the degree of increase in supercharging pressure at the initial stage of supercharging is acquired. Then, when the index value is smaller than the predetermined reference value, it is determined that a WGV closing failure has occurred. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2008-95587 [0004] Patent Document 2: Japanese Unexamined Patent Publication No. 2007-231821 [0005] In the conventional system described above, abnormality of the WGV is d...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): F02D23/00F02B37/18F02B39/16F02D9/04F02D21/08F02D43/00F02D45/00F02M25/07
CPCF02M25/0713F02M25/0707F02D41/0007F02D2200/0406F02B37/18Y02T10/40Y02T10/144F02M25/0727F02D41/221F02B29/0406F02M26/05F02M26/10F02M26/23Y02T10/12
Inventor宫下茂树
OwnerTOYOTA JIDOSHA KK