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Diesel Engine Controls

A diesel engine and control device technology, applied in engine control, engine components, combustion engines, etc., can solve problems such as the low NOx purification state of the catalyst, the catalyst cannot reach the active temperature, and the NOx purification cannot be fully carried out, so as to reduce the NOx emission. Effect

Active Publication Date: 2017-06-06
MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In a diesel engine control device equipped with an SCR catalyst for purifying NOx in the exhaust gas, there are cases where the catalyst cannot reach the activation temperature and the NOx purification state of the catalyst continues to decrease even after the engine is started and the low-load operation with low exhaust gas temperature continues. , the problem that the purification of NOx cannot be fully performed

Method used

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no. 1 approach ＞

[0060] figure 1 It is a block diagram showing the system configuration of a diesel engine control device according to an embodiment of the present invention. First, refer to figure 1 , the overall configuration of the diesel engine control device 1 according to the present embodiment will be described.

[0061] Such as figure 1As shown, the diesel engine control device 1 of this embodiment includes: a diesel engine 10; an engine control unit (hereinafter referred to as "ECU") 60 for controlling the operation state of the diesel engine 10; The intake passage 12; the exhaust passage 14 through which the exhaust gas discharged from the diesel engine 10 passes. Arrows i, e, and c in the figure indicate the flow directions of intake air, exhaust air, and recirculated exhaust air, respectively.

[0062] In the diesel engine 10, high-pressure fuel stored under pressure in the common rail injection system 26 is injected from the fuel injection device 24 toward the combustion chamb...

no. 2 approach ＞

[0086] Figure 5 It is a block diagram showing the system configuration of a diesel engine control device according to an embodiment of the present invention. Figure 6 It is a block diagram showing the configuration of an ECU according to an embodiment of the present invention. The diesel engine control device 1 of the present embodiment has basically the same configuration as that of the above-mentioned embodiment, and the same reference numerals are assigned to the same components, and detailed description thereof will be omitted.

[0087] In the diesel engine control device 1 of the present embodiment, as Figure 5 As shown, no NOx sensor 40 a is disposed upstream of the SCR catalyst 30 . and as an alternative to it, as in Figure 6 As shown, the ECU 60 is provided with a NOx concentration estimating unit 60d, and this embodiment differs from the above-described embodiment in this point.

[0088] The NOx concentration estimating unit 60d stores in advance Figure 7 NOx ...

no. 3 approach ＞

[0092] Figure 8 It is a block diagram showing the configuration of an ECU according to an embodiment of the present invention. The diesel engine control device 1 of the present embodiment has basically the same configuration as that of the above-mentioned embodiment, and therefore the same reference numerals are assigned to the same components, and detailed description thereof will be omitted.

[0093] In the present embodiment, the urea water injection ON / OFF signal transmitted from the ECU 60 to the urea water injection device 30a is also transmitted to the purification state determination unit 60c. Then, the purification state determination unit 60c determines the NOx purification state based on whether or not urea water is injected from the urea water injection device 30a, and this embodiment differs from the above-described embodiment in this point.

[0094] That is, the purification state determination unit 60c of the present embodiment determines that the SCR catalyst...

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Abstract

Provided is a diesel engine control device configured to evaluate the active state of an SCR catalyst with high precision using a method other than the catalyst temperature, and to control engine control parameters to reduce NOx while the SCR catalyst is in an inactive state. discharge volume. An engine control unit (60) and an SCR catalyst (30), the engine control unit comprising: a parameter setting unit (60a) for setting engine control parameters, an operation control unit (60b) for controlling the operating state of the engine based on the engine control parameters, and determining The purification state determination unit (60c) of the NOx purification state of the SCR catalyst, and the parameter setting unit (60a) when the NOx purification state of the SCR catalyst (30) determined by the purification state determination unit (60c) is lower than a predetermined NOx purification state In this case, the engine control parameters are set so that the NOx emission amount of the exhaust gas discharged from the engine is reduced.

Description

technical field [0001] The present invention relates to a diesel engine control device including an SCR catalyst for purifying NOx in exhaust gas. Background technique [0002] In a diesel engine control device equipped with an SCR catalyst for purifying NOx in exhaust gas, there are cases where the catalyst cannot reach the activation temperature and the NOx purification state of the catalyst continues to decrease even after the engine is started and the low-load operation with low exhaust gas temperature continues. , the problem that the purification of NOx cannot be sufficiently performed. [0003] In Patent Documents 1 to 4, the following technologies are disclosed: controlling the operating state of the engine according to the catalyst temperature, especially when the catalyst temperature reaches the activation temperature, in order to improve fuel economy, control the EGR rate, fuel injection pressure and fuel injection Timing and other engine control parameters for e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00F02D21/08F02D41/04
CPCF02D41/1446F02D41/1461F02D41/1463F02D2250/36F02B3/06F02D41/0235F02D41/1462F02D41/401F02D41/005F02D2250/31F01N3/103F01N3/208F01N3/023F01N2560/026F01N2560/06F01N2560/08F01N2560/14F01N2900/1621F02M26/05F02M26/15F01N2610/02Y02T10/12F01N11/007F01N2550/02F01N2610/1453F02D41/1465
Inventor 山本高之山田知秀高柳恒
Owner MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD