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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 different operating parameters, abnormal operating parameter values, and inability to properly control the amount of NOx

Inactive Publication Date: 2015-04-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the above-mentioned abnormality occurs, there is a possibility that the values ​​of the above-mentioned operating parameters obtained by the conventional device are not normal.
When the values ​​of the above operating parameters are abnormal, conventional devices cannot properly control the amount of NOx
And, when the value of the above-mentioned operating parameter is abnormal, the conventional device cannot confirm the value of the acquired operating parameter (that is, a value different from the actual (actual) operating parameter value), and the actual (real) operating parameter value. ) how the values ​​of the operating parameters differ

Method used

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

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no. 1 Embodiment approach ）

[0132]

[0133] figure 1 A schematic configuration of a system in which the control device (hereinafter, also referred to as "first device") according to the first embodiment of the present invention is applied to the internal combustion engine 10 is shown. The internal combustion engine 10 is a 4-cylinder diesel internal combustion engine having four cylinders, namely, a first cylinder to a fourth cylinder. Hereinafter, for the sake of convenience, the "internal combustion engine (internal combustion engine)" will also be simply referred to as "internal combustion engine (engine)".

[0134] The internal combustion engine 10 such as figure 1 As shown, it includes: an engine body 20 including a fuel injection (supply) system; an air intake system 30 for introducing air into the engine body 20 ; and an exhaust gas for releasing gas discharged from the engine body 20 to the outside of the internal combustion engine 10 system 40; EGR device 50 for recirculating exhaust gas fro...

no. 2 Embodiment approach ）

[0389] Next, a control device (hereinafter also referred to as "second device") according to a second embodiment of the present invention will be described.

[0390]

[0391] The second device is applied to an internal combustion engine having the same configuration as the internal combustion engine 10 to which the first device is applied (refer to figure 1 . For convenience, hereinafter referred to as "internal combustion engine 10"). In view of this, a detailed description of the outline of the device to which the second device is applied will be omitted.

[0392]

[0393] Hereinafter, an outline of the operation of the second device configured as described above will be described.

[0394] The difference between the second device and the first device is that instead of the relationship between the fuel injection amount target value Qtgt and the NOx concentration deviation ΔNOx in the first device (that is, the first relationship R1(Qtgt, ΔNOx)), based on the "progress...

no. 3 Embodiment approach ）

[0593] Next, a control device (hereinafter also referred to as "third device") according to a third embodiment of the present invention will be described.

[0594]

[0595] The third device is applied to an internal combustion engine having the same configuration as the internal combustion engine 10 to which the first device is applied (refer to figure 1 . For convenience, hereinafter referred to as "internal combustion engine 10"). In view of this, a detailed description of the outline of the device to which the third device is applied will be omitted.

[0596]

[0597] Hereinafter, an outline of the operation of the third device configured as described above will be described.

[0598] The third device differs from the first device and the second device only in the relationship between the target value Qtgt of the fuel injection amount based on the first device and the NOx concentration deviation ΔNOx (that is, the first relationship R1(Qtgt, ΔNOx)) , and the relation...

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Abstract

Disclosed is a control device for an internal combustion engine, which determines a fuel injection quantity deviation state and / or an intake oxygen concentration-related parameter deviation state on the basis of the relationship between the target value (Qtgt) of the fuel injection quantity and an NOx concentration deviation (”Ox) indicating the difference of the measured value or the estimate value of the NOx concentration of exhaust gas with respect to a predetermined NOx reference concentration, said control device being provided with a state determination means for, on the basis of a first determination index including the amount of change of the NOx concentration deviation (”NOx) when the target value (Qtgt) of the fuel injection quantity increases within a predetermined range and the NOx concentration deviation (”NOx) when the target value (Qtgt) of the fuel injection quantity is a predetermined first value (Qtgt2), and the like, determining whether the fuel injection quantity deviation is zero, positive, or negative.

Description

technical field [0001] The present invention relates to a control device for an internal combustion engine that controls the amount of nitrogen oxides (hereinafter also referred to as “NOx”) exhausted from the internal combustion engine. Background technique [0002] Noxious substances (hereinafter also referred to as "emissions") such as NOx and particulate matter (hereinafter also referred to as "PM") are contained in the exhaust gas from internal combustion engines such as spark ignition internal combustion engines and diesel internal combustion engines (especially diesel internal combustion engines) . It is desirable that the discharge of such emissions be as low as possible. As a method of reducing the amount of NOx contained in the exhaust gas, for example, a method of controlling the amount of gas recirculated from the EGR device, that is, the amount of EGR gas has been proposed in accordance with the operating state of the internal combustion engine. [0003] Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00
CPCF02D41/005F02D41/144F02D41/1454F02D41/146F02D41/18F02D41/22F02D41/221F02D41/222F02D2200/0406F02D2200/0614F02D2250/36Y02T10/40F02D41/182
Inventor 青柳真介
Owner TOYOTA JIDOSHA KK
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