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Internal combustion engine control device

A technology for a control device and an internal combustion engine, which is applied in engine control, internal combustion piston engine, electrical control, etc., can solve problems such as the inability to accurately estimate the state quantity of the turbine flow and exhaust gas, and the inability to assume a turbocharger with a wastegate valve.

Active Publication Date: 2013-07-24
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the turbo model of the above-mentioned prior art, it cannot be assumed that a turbocharger equipped with a wastegate valve (WGV)
Therefore, during the transient operation of the internal combustion engine, it is impossible to estimate the exhaust gas state quantity such as the turbine flow rate with high accuracy.

Method used

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  • Internal combustion engine control device
  • Internal combustion engine control device
  • Internal combustion engine control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0062] [Structure of Embodiment 1]

[0063] figure 1 It is a schematic configuration diagram for explaining a system configuration as an embodiment of the present invention. The intake system of the internal combustion engine 10 includes an intake passage 12 . Air from the atmosphere is drawn into the air intake passage 12 and distributed to the combustion chambers of the cylinders. An air cleaner 14 is attached to an inlet of the air intake passage 12 . Furthermore, an air flow meter 38 for detecting the amount of intake air is provided in the intake passage 12 on the downstream side of the air cleaner 14 .

[0064] A turbocharger 20 is provided downstream of the air filter 14 . 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 203 . The compressor 201 is rotationally driven by exhaust gas energy input to the turbine 202 .

[0065] A throttle valve 18 is arranged downs...

Embodiment approach 2

[0103] [Features of Embodiment 2]

[0104] Next, refer to Figure 5 and Figure 6 Embodiment 2 of the present invention will be described. System usage of this embodiment figure 1 The hardware structure shown can be implemented in EUC40 by Figure 6 shown in the program to achieve.

[0105] In the first embodiment described above, the turbine flow rate is sequentially calculated with high accuracy during transient operation in which mcyl changes while the WGV opening degree WG is controlled at a constant opening degree. On the other hand, in the second embodiment, the turbine flow rate is calculated with high accuracy during transient operation in which the WGV opening degree WG changes while mcyl is constant.

[0106] Figure 5 It is a graph for explaining the change of the turbine flow rate with the change of the WGV opening degree WG. In addition, in this figure, as an example of the transition state, it shows the case where the operating state of the internal combus...

Embodiment approach 3

[0129] [Feature of Embodiment 3]

[0130] Next, refer to Figure 7 and Figure 8 Embodiment 3 of the present invention will be described. System usage of this embodiment figure 1 The hardware structure shown can be implemented in EUC40 by Figure 8 shown in the program to achieve.

[0131] In Embodiments 1 and 2 described above, the turbine flow rate during transient operation is calculated with high precision. On the other hand, in Embodiment 3, the temperature of the exhaust gas after the exhaust gas flowing to the turbine 202 side and the exhaust gas flowing to the WGV 28 side are merged is estimated with high precision using the calculated flow ratio of the turbine flow rate to mcyl (hereinafter referred to as "Turbine Downstream Gas Temperature").

[0132] Figure 7 It is a graph showing the gas temperature downstream of the turbine relative to Ntb and mcyl during steady-state operation of the internal combustion engine 10 . As shown in the figure, during steady-s...

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Abstract

The present invention provides a control device for an internal combustion engine capable of estimating a turbine flow rate during transient operation with high accuracy in an internal combustion engine with a turbocharger having a WGV. During the transient operation of the internal combustion engine (10), the exhaust gas flow rate (mcyl (=mB)), WGV opening (WG (=X)) and turbine speed (Ntb (=Na)) are obtained respectively (steps 100-104). Calculate the turbine flow rate (mtA) and (mcyl (mA)) when the Ntb and WG obtained during the transient operation are realized during the steady state operation (steps 106 to 108). The flow ratio of mtA to mA is applied to mcyl during transient operation, and the turbine flow rate (=mtB) during transient operation is calculated (step 110). It is preferable to estimate Ntb during Ntb transient operation using the amount of change in turbine flow rate (Δmt(=mtB−mtA)) during transient operation (steps 114, 100).

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 including a turbocharger having a wastegate valve (WGV). Background technique [0002] Conventionally, for example, Japanese Patent Application Laid-Open No. 2006-227632 discloses a technique of calculating a supercharging pressure from exhaust gas characteristics using a turbocharger model. In this technique, more specifically, a turbine model calculates turbine power from exhaust characteristics, and a shaft model converts the turbine power into compressor power using previously obtained conversion efficiency. The compressor model calculates the supercharging power used for actual supercharging from the compressor power, and estimates the supercharging pressure from the supercharging power. [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2006-22763 [0004] Patent Doc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B37/18F02D23/02
CPCF02B37/18F02D41/0007F02D41/107F02D2200/0402Y02T10/12
Inventor 永乐玲
Owner TOYOTA JIDOSHA KK