WO1994025747B1 - Diagnostic system for canister purge system - Google Patents
Diagnostic system for canister purge systemInfo
- Publication number
- WO1994025747B1 WO1994025747B1 PCT/US1994/004534 US9404534W WO9425747B1 WO 1994025747 B1 WO1994025747 B1 WO 1994025747B1 US 9404534 W US9404534 W US 9404534W WO 9425747 B1 WO9425747 B1 WO 9425747B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- purge
- valve
- partial vacuum
- canister
- vent
- Prior art date
Links
- 238000010926 purge Methods 0.000 title claims abstract 30
- 239000000446 fuel Substances 0.000 claims abstract 9
- 239000002828 fuel tank Substances 0.000 claims abstract 7
- 238000002485 combustion reaction Methods 0.000 claims abstract 3
- 230000000694 effects Effects 0.000 claims 4
- 238000001704 evaporation Methods 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
Abstract
The present invention provides a system for detecting leaks in the evaporative emission control system utilized in automotive vehicles. Such control systems include a carbon filled canister having both a vent port and a fuel vapor port. The fuel vapor port, as well as a vapor line from the fuel tank, are connected through a purge valve to the intake manifold of the internal combustion engine. The present invention includes a vent valve which is fluidly connected with the canister vent port. An electronic control system closes both the vent valve and opens the purge valve thereby exposing the evaporative emission control system to the partial vacuum in the intake manifold. After a predetermined time period, the purge valve is closed thus entrapping the partial vacuum in the purge system while a pressure transducer thereafter monitors the partial vacuum in the purge system. Changes in the partial vacuum over a time period, after correction by extraneous factors such as temperature and fuel volume in the fuel tank, greater than a threshold amount indicates a leak in the evaporative emission system. When this occurs, the system generates a fault signal to alert the vehicle operator of the leak.
Claims
1. For use in conjunction with a fuel system for an internal combustion engine having an intake manifold, a fuel tank and an evaporative emission control system, said evaporative emission control system having a fuel vapor canister having a vent port and a vapor port and a canister purge valve fluidly connected between said canister vapor port and said intake manifold, a system for detecting leaks in the evaporative emission control system comprising: a vent valve fluidly connected in series with the canister vent port, means for closing said vent valve and opening said purge valve to thereby create a partial vacuum in said purge system, means for thereafter closing said purge valve to thereby entrap said partial vacuum in said purge system, means for measuring said partial vacuum in said purge system, means for generating a fault signal when the change in the partial pressure after said closure of said purge valve exceeds a leakage threshold value over a predetermined time period, means for measuring the temperature of fluid in the purge system, means for measuring the volume of liquid in the fuel tank, wherein the leakage threshold value is a function of the vacuum droop rate of the purge system and is calculated in accordance with the following equation:
Rl =((Dp -Edt) -Erup) * Vv
where Rl equals the leakage threshold value Dp = pressure change Edt = effect of temperature change Erup = effect of evaporation of fuel Vv = vapor volume.
2. The invention as defined in claim 1 and comprising means for opening said vent valve and said purge valve after said predetermined time period. - 14 -
3. The invention as defined in claim 1 wherein said partial vacuum measuring means comprises a pressure transducer.
4. The invention as defined in claim 3 wherein said pressure transducer is fluidly connected to a head space in said fuel tank.
5. The invention as defined in claim 1 and comprising a bypass valve fluidly connected in series between said fiiel tank and said canister, and means for opening said bypass valve during said predetermined time period.
6. The invention as defined in claim 5 wherein said purge valve, said bypass valve and said vent valve are each electrically actuated.
7. The invention as defined in claim 6 wherein said purge valve, said bypass valve and said vent valve are each contained in a common housing.
8. The invention as defined in claim 1 and comprising means for monitoring the temperature of the purge system.
9. The invention as defined in claim 8 wherein said temperature monitoring means comprises a temperature transducer positioned in said fuel tank.
10. For use in conjunction with a fuel system for an internal combustion engine having an intake manifold, a fuel tank and an evaporative emission control system, said evaporative emission control system comprising a fuel vapor canister having a vent port and a vapor port, a canister purge valve fluidly connected between said canister vapor port and said intake manifold and a vent valve fluidly connected in series with the canister vent port, a method for detecting leaks in the evaporative emission system comprising: - 15 -
closing said vent valve and opening said purge valve to thereby create a partial vacuum in said purge system, thereafter closing said purge valve to thereby entrap said partial vacuum in said purge system, measuring said partial vacuum in said purge system, and generating a fault signal when the change in the partial pressure after said closure of said purge valve exceeds a leakage threshold value over a predetermined time period, wherein the leakage threshold value is a function of the vacuum droop rate of the purge system and is calculated in accordance with the following equation:
Rl =((Dp -Edt) -Erup) * Vv
where Rl equals the leakage threshold value Dp = pressure change Edt = effect of temperature change Erup = effect of evaporation of fuel Vv = vapor volume.
11. The invention as defined in claim 10 and further comprising the step of measuring the fluid temperature in the purge system during said predetermined time period.
12. The invention as defined in claim 10 and further comprising the step of allowing the partial vacuum to equalize for a preset time period after closure of the purge valve and prior to measuring the partial vacuum.
13. The invention as defined in claim 10 and further comprising the step of imposing a preset time delay after said purge valve closing step and prior to said partial vacuum measuring step.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU69040/94A AU6904094A (en) | 1993-04-26 | 1994-04-25 | Diagnostic system for canister purge system |
| EP94917271A EP0734492A4 (en) | 1993-04-26 | 1994-04-25 | Diagnostic system for canister purge system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/055,662 US5333590A (en) | 1993-04-26 | 1993-04-26 | Diagnostic system for canister purge system |
| US08/055,662 | 1993-04-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994025747A1 WO1994025747A1 (en) | 1994-11-10 |
| WO1994025747B1 true WO1994025747B1 (en) | 1994-12-22 |
Family
ID=21999361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1994/004534 WO1994025747A1 (en) | 1993-04-26 | 1994-04-25 | Diagnostic system for canister purge system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5333590A (en) |
| EP (1) | EP0734492A4 (en) |
| AU (1) | AU6904094A (en) |
| WO (1) | WO1994025747A1 (en) |
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| DE4307100C2 (en) * | 1993-03-06 | 1997-08-07 | Daimler Benz Ag | Procedure for checking the function of a regeneration valve in a tank ventilation system |
| JP3183431B2 (en) * | 1993-06-07 | 2001-07-09 | 本田技研工業株式会社 | Evaporative fuel processor for internal combustion engines |
| EP0635633B1 (en) * | 1993-07-21 | 1997-09-24 | Siemens Aktiengesellschaft | Method for monitoring a fuel tank aeration system trapping fuel vapours and feeding them into an internal combustion engine |
| US5495842A (en) * | 1993-09-10 | 1996-03-05 | Honda Giken Kogyo Kabushiki Kaisha | Evaporative fuel-processing system for internal combustion engines |
| US5501199A (en) * | 1993-09-28 | 1996-03-26 | Nissan Motor Co., Ltd. | Monitoring of evaporative purge system |
| JP3630711B2 (en) * | 1994-01-31 | 2005-03-23 | 富士重工業株式会社 | Vehicular fuel tank internal pressure adjustment device |
| US5507176A (en) * | 1994-03-28 | 1996-04-16 | K-Line Industries, Inc. | Evaporative emissions test apparatus and method |
| US5644072A (en) * | 1994-03-28 | 1997-07-01 | K-Line Industries, Inc. | Evaporative emissions test apparatus and method |
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| GB9413164D0 (en) * | 1994-06-30 | 1994-08-24 | Rover Group | A method of and apparatus for determining whether a leak is present in a fuel system |
| US5614665A (en) * | 1995-08-16 | 1997-03-25 | Ford Motor Company | Method and system for monitoring an evaporative purge system |
| JP3322119B2 (en) * | 1996-03-04 | 2002-09-09 | 三菱電機株式会社 | Failure diagnosis device for fuel evaporation prevention device |
| JP3367373B2 (en) * | 1997-03-28 | 2003-01-14 | 日産自動車株式会社 | Diagnosis device for evaporative fuel treatment equipment |
| US5878727A (en) * | 1997-06-02 | 1999-03-09 | Ford Global Technologies, Inc. | Method and system for estimating fuel vapor pressure |
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| JP5725376B2 (en) * | 2012-09-06 | 2015-05-27 | 株式会社デンソー | Electromagnetic valve control device and electromagnetic valve control method |
| US9284922B2 (en) | 2013-01-29 | 2016-03-15 | Ford Global Technologies, Llc | Controlling the closing force of a canister purge valve prior to executing leak diagnostic |
| US10330051B2 (en) | 2016-12-22 | 2019-06-25 | Ford Global Technologies, Llc | Systems and methods for intelligent vehicle evaporative emissions diagnostics |
| US10718282B2 (en) | 2016-12-22 | 2020-07-21 | Ford Global Technologies, Llc | Systems and methods for intelligent vehicle evaporative emissions diagnostics |
| US10508618B2 (en) | 2017-12-18 | 2019-12-17 | Ford Global Technologies, Llc | Systems and methods for vehicle fuel system and evaporative emissions system diagnostics |
| US10982607B2 (en) | 2017-12-18 | 2021-04-20 | Ford Global Technologies, Llc | Systems and methods for vehicle fuel system and evaporative emissions system diagnostics |
| US11168648B2 (en) | 2019-06-03 | 2021-11-09 | Ford Global Technologies, Llc | Systems and methods for vehicle fuel system and evaporative emissions system diagnostics |
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| US5220898A (en) * | 1991-08-22 | 1993-06-22 | Toyota Jidosha Kabushiki Kaisha | Pressure control system for controlling pressure in fuel tank of engine by controlling discharging of evaporated fuel in fuel tank into canister |
| US5237979A (en) * | 1991-09-02 | 1993-08-24 | Toyota Jidosha Kabushiki Kaisha | Evaporative fuel control apparatus of internal combustion engine |
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-
1993
- 1993-04-26 US US08/055,662 patent/US5333590A/en not_active Expired - Fee Related
-
1994
- 1994-04-25 WO PCT/US1994/004534 patent/WO1994025747A1/en not_active Application Discontinuation
- 1994-04-25 AU AU69040/94A patent/AU6904094A/en not_active Abandoned
- 1994-04-25 EP EP94917271A patent/EP0734492A4/en not_active Ceased
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