22-06-2016 дата публикации
Номер: KR1020160071576A
Принадлежит:
The present invention relates to a method to diagnose a leakage of a vehicle fuel tank which easily diagnoses a leakage of the fuel tank without a conventional and additional diagnostic equipment, by diagnosing whether there is a leakage of a vehicle fuel tank in an end of line (EOL) for assembling a vehicle using a natural vacuum leakage detection (NVLD) module, an engine control unit (ECU), or the like. COPYRIGHT KIPO 2016 (AA) Start (B1,B2,B3,B4,B5) No (C1,C2,C3,C4,C5) Yes (D1,D2) Move to step S118 (S100,S107) Receive the information of an NVLD module (S101) Is the fuel leakage diagnosis condition satisfied? (S102) No result (S103) Elevate vehicle engine RPM (S104) Is the target RPM value satisfied? (S105) Open a purge valve, calculate a purge flow rate and an air-fuel ratio control accumulated value (S106) Is the target flow rate satisfied? (S108) Is the switch of the NVLD module opened? (S109) Is the purge valve failed? (S110) Diagnose the purge valve failure (S111) Diagnose the opening ...
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