LEAKAGE DETECTION DEVICE

The invention provides a leakage detection device that has little influence on drivability and detects leakage in a positive crankcase ventilation (PCV) passage of an engine. The leakage detection device includes: a pressure sensor that measures a pressure in the PCV passage; a leakage detection val...

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Bibliographic Details
Main Authors SHIWA DAIKI, TAKAHASHI DAISUKE
Format Patent
LanguageChinese
English
Published 23.10.2018
Subjects
BLASTING
COMBUSTION ENGINES
COMBUSTION ENGINES IN GENERAL
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
INTERNAL-COMBUSTION PISTON ENGINES
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:The invention provides a leakage detection device that has little influence on drivability and detects leakage in a positive crankcase ventilation (PCV) passage of an engine. The leakage detection device includes: a pressure sensor that measures a pressure in the PCV passage; a leakage detection valve that opens and closes a fresh air line; a PCV valve that adjusts a flow rate of blow-by gas conveyed to a scavenging line from a crank chamber; a pressure sensor that measures a pressure in an intake passage of the engine downstream of a throttle valve; a leakage detection valve control unit thatperforms control to close the leakage detection valve when a predetermined leakage diagnostic condition is satisfied; a PCV valve control unit that gradually reduces an opening degree of the PCV valve before the leakage detection valve is closed, and suppresses a flow rate in the PCV passage to a predetermined amount in accordance with the pressure in an intake manifold after the leakage detection valve is closed; and a
Bibliography:Application Number: CN201711337360