Procedure to diagnose a leak in the fuel tank in a fuel tank ventilation system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01M-003/26
G01M-003/32
출원번호
UP-0880538
(2007-07-23)
등록번호
US-7584651
(2009-09-22)
우선권정보
DE-10 2006 034 076(2006-07-24)
발명자
/ 주소
Streib, Martin
Lederle, Karl Bernhard
Pfeil, Michael
출원인 / 주소
Robert Bosch GmbH
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
2인용 특허 :
20
초록▼
A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulator and the fuel tank ventilati
A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulator and the fuel tank ventilation valve are connected by way of a system of lines and wherein the accumulator has an aeration line with a check valve, the method comprising: immediately before turning off the internal combustion engine, closing the check valve and opening the fuel tank ventilation valve to generate a vacuum in the fuel tank ventilation system; acquiring a vacuum degradation at specifiable points in time when the fuel tank ventilation valve is closed; opening of the check valve in order to bring about a pressure equilibrium with the ambient pressure; renewed closing of the check valve; acquiring a pressure increase emerging over at least a specifiable time interval and determination of a compensation variable; and inference about the presence of a leakage from behavior of the vacuum degradation over time, while taking into account behavior of the compensation variable over time.
대표청구항▼
The invention claimed is: 1. A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulat
The invention claimed is: 1. A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulator and the fuel tank ventilation valve are connected by way of a system of lines and wherein the accumulator has an aeration line with a check valve, the method comprising: immediately before turning off the internal combustion engine, closing the check valve and opening the fuel tank ventilation valve to generate a vacuum in the fuel tank ventilation system; acquiring a vacuum degradation at predetermined points in time when the fuel tank ventilation valve is closed; opening of the check valve in order to bring about a pressure equilibrium with the ambient pressure; again closing of the check valve; acquiring a pressure increase over time at least a predetermined time interval and determining a compensation variable; and determining the presence of a leakage from behavior of the vacuum degradation over time, while taking into account behavior of the compensation variable over time. 2. A method according to claim 1, wherein the compensation variable is a compensation gradient. 3. A method according to claim 1, further comprising adjusting the vacuum to a constant, predetermined value. 4. A method according to claim 3, wherein the vacuum is maintained at a constant value by means of a two-step control or by means of a continuous closed-loop control. 5. A method according to claim 1, wherein the internal combustion engine is turned off during the acquisition of the behavior of the vacuum degradation over time. 6. A method according to claim 1, wherein the check valve is closed and the fuel tank ventilation valve is opened in order to generate a vacuum in the fuel tank ventilation system if a diagnostic signal is constructed in an engine management system. 7. A method according to claim 6, wherein the diagnostic signal is produced, as soon as a forthcoming shutdown of the internal combustion engine is presumed from the parameters of the engine management system. 8. A method according to claim 7, wherein a variable or a combination of the following variables serves as a parameter of the engine management system: an engine rotational speed, an operating state or a gear stage of the internal combustion engine. 9. A method according to claim 8, wherein the internal combustion engine is only then turned off if at least one variable of the engine management system was produced, which characterizes a desired specifiable vacuum in the fuel tank ventilation system. 10. A method according to claim 9, wherein the internal combustion engine is turned off only after a time delay for the actuation of the switching equipment to turn off the internal combustion engine. 11. A method according to claim 1, wherein the vacuum in the fuel tank is measured by a pressure sensor.
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이 특허에 인용된 특허 (20)
Mc Lain, Kurt D.; Labus, Gregory E., Apparatus and method for fuel vapor leak detection.
Remboski Donald J. (Dearborn MI) Plee Steven L. (Brighton MI) Woznick Mark B. (Novi MI) Foley John F. (Novi MI), Apparatus and method of detecting a leak in an evaporative emissions system.
Malcolm James Grieve ; Stephen F. Majkowski ; Kenneth M. Simpson ; Michael J. Steckler ; Carelton Williams, Enhanced vacuum decay diagnostic and integration with purge function.
Cook John E. (Chatham CAX) Busato Murray F. (Chatham MI CAX) Casey Gary L. (Troy MI) Hanson John D. (Bloomfield Hills MI), Integrity confirmation of evaporative emission control system against leakage.
Martin, Douglas Raymond; Sipes, Ann Irene; Jentz, Robert Roy; Dudar, Aed Mohammad; Peters, Mark W.; Hu, Guopeng, Vapor purge system integrity diagnosis for a hybrid vehicle.
Martin, Douglas Raymond; Sipes, Ann Irene; Jentz, Robert Roy; Dudar, Aed Mohammad; Peters, Mark W.; Hu, Guopeng, Vapor purge system integrity diagnosis for a hybrid vehicle.
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