FAULT DIAGNOSIS DEVICE
First Claim
1. A fault diagnosis device determining whether a fault occurs in an evaporative-gas purge pipe which is provided to an internal combustion engine with a supercharger, the evaporative-gas purge pipe including a first purge pipe through which an evaporative-gas generated in a fuel tank flows into an intake pipe downstream of a compressor, and a second purge pipe through which the evaporative-gas flows into the intake pipe upstream of the compressor, the intake pipe supplying an air to the internal combustion engine, the fault diagnosis device comprising:
- a first open/close valve provided to the first purge pipe;
a second open/close valve provided to the second purge pipe;
a pressure reduction pump reducing both of a pressure in the first purge pipe between the first open/close valve and the fuel tank and a pressure in the second purge pipe between the second open/close valve and the fuel tank;
an obtaining portion obtaining a flow rate information relating to a flow rate of an air flowing into the second purge pipe from the intake pipe; and
a control unit controlling an operation of whole of the fault diagnosis device, whereinwhen the internal combustion engine is stopped, the pressure reduction pump performs a pressure reduction while the first open/close valve and the second open/close are closed, andthe control unit determines whether a fault occurs in the second purge pipe between the second open/close valve and the intake pipe based on the flow rate information which is obtained immediately after the second open/close valve is opened.
1 Assignment
0 Petitions
Accused Products
Abstract
When the internal combustion engine is stopped, a pressure reduction pump performs a pressure reduction while a first open/close valve and a second open/close valve are closed. After that, a control unit determines whether a fault occurs in a second purge pipe between the second open/close valve and an intake pipe based on a measured value obtained by an obtaining portion immediately after the second open/close valve is opened.
14 Citations
5 Claims
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1. A fault diagnosis device determining whether a fault occurs in an evaporative-gas purge pipe which is provided to an internal combustion engine with a supercharger, the evaporative-gas purge pipe including a first purge pipe through which an evaporative-gas generated in a fuel tank flows into an intake pipe downstream of a compressor, and a second purge pipe through which the evaporative-gas flows into the intake pipe upstream of the compressor, the intake pipe supplying an air to the internal combustion engine, the fault diagnosis device comprising:
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a first open/close valve provided to the first purge pipe; a second open/close valve provided to the second purge pipe; a pressure reduction pump reducing both of a pressure in the first purge pipe between the first open/close valve and the fuel tank and a pressure in the second purge pipe between the second open/close valve and the fuel tank; an obtaining portion obtaining a flow rate information relating to a flow rate of an air flowing into the second purge pipe from the intake pipe; and a control unit controlling an operation of whole of the fault diagnosis device, wherein when the internal combustion engine is stopped, the pressure reduction pump performs a pressure reduction while the first open/close valve and the second open/close are closed, and the control unit determines whether a fault occurs in the second purge pipe between the second open/close valve and the intake pipe based on the flow rate information which is obtained immediately after the second open/close valve is opened. - View Dependent Claims (2, 3, 4, 5)
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Specification
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- Resources
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Current AssigneeDENSO Corporation
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Original AssigneeDENSO Corporation
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InventorsNAKATA, Rei
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current
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CPC Class CodesB60K 15/03 Fuel tanks chassis frame co...B60K 2015/03302 Electromagnetic valvesB60K 2015/0348 for returning the fuel from...B60K 2015/03514 with vapor recovery meansF02M 25/08 adding fuel vapours drawn f...F02M 25/0809 Judging failure of purge co...F02M 25/0836 Arrangement of valves contr...F02M 25/089 Layout of the fuel vapour i...G01M 15/04 Testing internal-combustion...
