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Exhaust system state detection device

A state detection device and exhaust system technology, applied in the direction of charging system, electrical control, exhaust gas recirculation, etc., can solve the problem of cooling efficiency reduction

Inactive Publication Date: 2016-03-16
ISUZU MOTORS LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the oil and soot in the exhaust gas adhere to the EGR cooler, the cooling efficiency is reduced, and the high-temperature EGR gas is recirculated to the intake system

Method used

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  • Exhaust system state detection device
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  • Exhaust system state detection device

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Experimental program
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Embodiment Construction

[0017] Below, based on figure 1 , 2 A state detection device for an exhaust system according to an embodiment of the present invention will be described. The same symbols are assigned to the same components, and the names and functions of these components are also the same. Therefore, detailed description of these components will not be repeated.

[0018] Such as figure 1 As shown, an intake manifold 10A and an exhaust manifold 10B are provided on a diesel engine (hereinafter simply referred to as an engine) 10 . An intake passage (intake pipe) 11 for introducing fresh air is connected to the intake manifold 10A, and an exhaust passage (exhaust pipe) 12 for discharging exhaust gas to the atmosphere is connected to the exhaust manifold 10B.

[0019] In the exhaust passage 12 , a turbine 14B of the supercharger 14 , an exhaust aftertreatment device (not shown), and the like are provided in this order from the exhaust upstream side. In the intake passage 11, the MAF sensor 3...

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PUM

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Abstract

In order to provide an exhaust system state detection device with which the exhaust temperature can be detected effectively using a simple configuration, an exhaust system state detection device according to the present invention is equipped with: an intake air oxygen concentration sensor (32) that detects the intake air oxygen concentration in an engine (10); an engine rotation sensor (30) and an acceleration position sensor (31) that detect the operating state; an indicated thermal efficiency calculation unit (42) that calculates the amount of change in the indicated thermal efficiency of the engine (10) on the basis of the intake air concentration, the fuel injection start timing, and a previously stored first model equation defining the relationship between the intake air concentration, the injection start timing, and the amount of change in the indicated thermal efficiency; and an exhaust temperature calculation unit (43) that calculates the exhaust temperature of the engine (10) on the basis of the amount of change in the indicated thermal efficiency and a previously stored second model equation defining the relationship between the exhaust temperature and the amount of change in the indicated thermal efficiency.

Description

technical field [0001] The present invention relates to a state detection device of an exhaust system, and particularly relates to a state detection device of an exhaust system which detects the temperature of exhaust gas discharged from an engine. Background technique [0002] Conventionally, an exhaust gas recirculation device (Exhaust Gas Recirculation: hereinafter referred to as an EGR device) that recirculates a part of exhaust gas from an engine to an intake system is known. The EGR device is configured by including an EGR cooler for cooling the EGR gas on piping connecting the exhaust system and the intake system. [0003] When the oil and soot in the exhaust gas adhere to the EGR cooler, the cooling efficiency is reduced, and the high-temperature EGR gas is recirculated to the intake system. Focusing on such a problem, there is known a technique in which exhaust gas temperature sensors are respectively installed on the upstream side and downstream side of the EGR co...

Claims

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Application Information

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IPC IPC(8): F02D45/00F02D21/08F02M26/49
CPCF02D41/144F02D41/1447F02D41/1456F02D2041/1433F02D2200/0618F02M26/49F02M26/33F02M26/46F02M26/47F02D21/08
Inventor 塙哲史伊海佳昭
Owner ISUZU MOTORS LTD