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Diagnosis device and diagnosis method for turbocharger

a turbocharger and diagnostic device technology, applied in the direction of internal combustion engine testing, safety/regulation devices, machines/engines, etc., can solve the problems of increasing the expansion ratio of the turbine and the likelihood of excessive load on the turbine component, so as to accelerate the progress of fatigue-based strength reduction

Inactive Publication Date: 2016-09-08
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text explains that when using a turbocharger in a high-altitude area, the low exhaust gas pressure can lead to a higher load on the turbine components, even without any resonance. This can accelerate the fatigue-based strength reduction of the components. The technical effect is to provide a solution to reduce the excess load on the turbine components in such conditions.

Problems solved by technology

In a case where the turbocharger is used at a low atmospheric pressure, the turbine expansion ratio tends to increase and an excessive load is likely to be applied to the turbine component.

Method used

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  • Diagnosis device and diagnosis method for turbocharger
  • Diagnosis device and diagnosis method for turbocharger
  • Diagnosis device and diagnosis method for turbocharger

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first embodiment

[0022]Hereinafter, a turbocharger diagnosis device will be described in detail with reference to FIGS. 1 to 3. The diagnosis device according to this embodiment is applied to a turbocharger that is mounted on an automotive diesel engine.

[0023]In an intake passage 10 of a diesel engine 1 where the turbocharger to which the diagnosis device according to this embodiment is applied is mounted, an air cleaner 11, a compressor 12, an intercooler 13, and an intake throttle valve 14 are placed in this order from the upstream side of the intake passage 10 as illustrated in FIG. 1. The air cleaner 11 filters intake air that is taken into the intake passage 10. The compressor 12 pressurizes the intake air as a built-in compressor wheel 12a rotates. The intercooler 13 cools the intake air pressurized in the compressor 12. The intake throttle valve 14 adjusts a flow rate of the intake air flowing through the intake passage 10 (the amount of suctioned air) through a change in valve opening degree...

second embodiment

[0051]Hereinafter, the turbocharger diagnosis device will be described in detail with reference to FIGS. 4 and 5. In the following description, the same reference numerals will be used to refer to the configurations common to both embodiments and detailed description thereof will be omitted.

[0052]In the first embodiment, the necessity of the replacement of the turbine wheel 19a is determined based on the number of times the turbine expansion ratio PIT exceeds the overload threshold α. However, even at the same number of times the turbine expansion ratio PIT exceeds the overload threshold α, the degree of the fatigue accumulated in the turbine wheel 19a varies depending on the extent to which the turbine expansion ratio PIT exceeds the overload threshold α. For example, a comparison between the case of FIG. 4A and the case of FIG. 4B shows that the turbine expansion ratio PIT exceeds the overload threshold α by a larger margin each time in the case of FIG. 4B although the turbine exp...

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Abstract

A diagnosis device for a turbocharger, the diagnosis device includes an electronic control unit. The electronic control unit is configured to calculate a turbine expansion ratio as a ratio of a pressure of the exhaust gas flowing into a turbine of the turbocharger to the pressure of the exhaust gas flowing out from the turbine; operate a deterioration evaluation value toward a predetermined one of an increase side and a decrease side when the turbine expansion ratio exceeds a threshold; and determine a replacement timing of a turbine component when a total operation amount of the deterioration evaluation is equal to or larger than a specified value, the total operation amount being an operation amount from an initial value of the deterioration evaluation value.

Description

INCORPORATION BY REFERENCE[0001]The disclosure of Japanese Patent Application No. 2015-040425 filed on Mar. 2, 2015 including the specification, drawings and abstract is incorporated herein by reference in its entirety.BACKGROUND[0002]1. Technical Field[0003]The disclosure relates to a diagnosis device and a diagnosis method for a turbocharger.[0004]2. Description of Related Art[0005]A turbine component of a turbocharger such as a turbine wheel has a service life determined in accordance with, for example, a traveling distance of a vehicle in which the turbocharger is mounted. The turbine component is replaced when the service life is over. When a rotation speed of a turbine reaches a specific rotation speed (resonance rotation speed), resonance is generated in the turbine and a larger-than-expected load might be applied to the component. In addition, fatigue-based strength reduction might proceed at a faster-than-expected pace when the generation of the resonance is repeated.[0006]...

Claims

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Application Information

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IPC IPC(8): F01D21/00
CPCF01D21/003G01M15/04
Inventor YAMADA, TOMOKOFUJIMURA, KAZUSHIROMATSUSHITA, TOMOHIKOOOTA, HIROHIKO
Owner TOYOTA JIDOSHA KK