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Exhaust gas recirculation apparatus for an engine

A technology of exhaust recirculation and exhaust recirculation valve, which is applied in the direction of engine components, engine control, combustion engine, etc., and can solve problems such as proper control of EGR valve

Inactive Publication Date: 2014-06-04
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, only by comparing the amount of change in requested power of the engine with a positive threshold value, the EGR valve is intended to be fully closed earlier when the engine is accelerating, and the EGR valve cannot be properly controlled according to the change in the subsequent operation request.

Method used

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  • Exhaust gas recirculation apparatus for an engine
  • Exhaust gas recirculation apparatus for an engine
  • Exhaust gas recirculation apparatus for an engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0098] Hereinafter, a first embodiment in which the engine exhaust gas recirculation device of the present invention is embodied in a supercharger-equipped engine will be described in detail with reference to the accompanying drawings.

[0099] figure 1 An engine system including an exhaust gas recirculation device (EGR device) of the engine of this embodiment is shown in a schematic configuration diagram. The engine system includes a reciprocating engine 1 . An intake passage 3 is connected to the intake port 2 of the engine 1 , and an exhaust passage 5 is connected to the exhaust port 4 . An air cleaner 6 is provided at the inlet of the intake passage 3 . A supercharger 7 for boosting intake air in the intake passage 3 is provided between the intake passage 3 and the exhaust passage 5 at a portion downstream of the air cleaner 6 of the intake passage 3 .

[0100] The supercharger 7 includes a compressor 8 arranged in the intake passage 3 , a turbine 9 arranged in the exha...

no. 2 Embodiment approach

[0144] Next, a second embodiment in which the engine exhaust gas recirculation device of the present invention is embodied in a supercharger-equipped engine will be described in detail with reference to the accompanying drawings.

[0145] In addition, in each of the following embodiments, the same reference numerals are assigned to the same components as those of the above-described first embodiment, and the description thereof will be omitted, and the description will be focused on the differences.

[0146] The present embodiment differs from the configuration of the first embodiment in the processing content of the EGR control. Image 6 An example of the processing contents of the EGR control of the present embodiment is shown by a flowchart. exist Image 6 The flow chart of the following aspects is related to image 3 The flow chart is different: Substitution image 3 The processing of step 110, step 200 and step 220 in the flow chart of the above, and the processing of ...

no. 3 Embodiment approach

[0163] Next, a third embodiment in which the engine exhaust gas recirculation device of the present invention is embodied in a supercharger-equipped engine will be described in detail with reference to the accompanying drawings.

[0164] The present embodiment differs from the configurations of the first embodiment and the second embodiment in the processing content of the EGR control. Figure 9 An example of the processing contents of the EGR control of the present embodiment is shown by a flowchart. exist Figure 9 The flow chart of the following aspects is related to Image 6 The flow chart is different: Substitution Image 6 The processing of step 111, step 170 and step 201 in the flowchart of the The processing of step 420 is added between 410 and step 171 , and the processing of step 430 is added between step 112 and step 171 .

[0165] That is, after obtaining the second deceleration determination value C2 based on the opening ratio Regr / TA in step 320 , the ECU 50 ...

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PUM

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Abstract

An EGR apparatus for an engine includes an EGR passage, an EGR valve, an accelerator sensor, and an ECU. The ECU compares a change amount (accelerator operating speed) per unit of time of an accelerator opening degree to a predetermined first determination value. When it is determined that a request for deceleration operation or acceleration operation is made to an engine, the ECU issues a fully closing command to the EGR valve. When it is determined that the deceleration or acceleration operation request is continued, the ECU continues to issue the fully closing command. When the deceleration or acceleration operation request is removed and the accelerator opening degree is larger or smaller than a predetermined second determination value, the ECU releases the fully closing command.

Description

technical field [0001] The present invention relates to an exhaust gas recirculation device of an engine that allows a part of exhaust gas discharged from an engine to an exhaust passage to flow into an intake passage as EGR gas and to return the EGR gas to the engine. Background technique [0002] Conventionally, such a technology has been used in, for example, automobile engines. An exhaust gas recirculation device (Exhaust Gas Recirculation (EGR) device) guides a part of the combusted exhaust gas discharged from the combustion chamber of the engine to the exhaust passage as EGR gas to the intake passage through the EGR passage, so as to be combined with the intake air. The intake air flowing in the passage is mixed and returned to the combustion chamber. The EGR gas flowing in the EGR passage is regulated by an EGR valve provided in the EGR passage. With this EGR, nitrogen oxides (NOx) in the exhaust gas can be mainly reduced, and the combustion efficiency of the engine...

Claims

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Application Information

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IPC IPC(8): F02M25/07F02D21/08
CPCF02M25/0704F02D2021/083F02D41/045F02D41/107F02D41/0055F02D2200/602F02M26/02F02M26/25F02M26/35Y02T10/40
Inventor 吉冈卫秋田实石井一史中村健英
Owner AISAN IND CO LTD
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