IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0992144
(2009-04-17)
|
등록번호 |
US-8631689
(2014-01-21)
|
우선권정보 |
DE-10 2008 023 607 (2008-05-15) |
국제출원번호 |
PCT/EP2009/054581
(2009-04-17)
|
§371/§102 date |
20101111
(20101111)
|
국제공개번호 |
WO2009/138310
(2009-11-19)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Continental Automotive GmbH
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
A method for the functional testing of a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, enables the testing of the pressure switch even while the crankshaft is rotating. The pressure switch is located in a low pressure position if the pressure in the tank
A method for the functional testing of a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, enables the testing of the pressure switch even while the crankshaft is rotating. The pressure switch is located in a low pressure position if the pressure in the tank vent device is lower than a pressure threshold, and is otherwise in a high pressure position. In a rotating operating state of the crankshaft in which the pressure in an intake pipe exceeds the pressure threshold, a tank vent valve being disposed in a connecting line between a fuel vapor reservoir and the intake pipe is actuated such that the tank vent device and the intake pipe are pneumatically connected to each other. The pressure switch is assessed as defective if it is in the low pressure position after actuation of the tank vent valve.
대표청구항
▼
1. A method for the functional testing of a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, with the pressure switch being located in a low-pressure position if the pressure in the tank vent device is lower than a pressure threshold, and said pressure swit
1. A method for the functional testing of a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, with the pressure switch being located in a low-pressure position if the pressure in the tank vent device is lower than a pressure threshold, and said pressure switch otherwise being in a high-pressure position, the method comprising: in an operating state in which a crankshaft of the internal combustion engine rotates and the pressure in an intake pipe of the internal combustion engine exceeds the pressure threshold, actuating a tank vent valve of the tank vent device, said valve being disposed in a connecting line between a fuel vapor reservoir and the intake pipe, in such a way that the tank vent device and the intake pipe are pneumatically connected,assessing the pressure switch as defective if the pressure switch is in the low-pressure position after actuation of the tank vent valve. 2. The method according to claim 1, wherein the operating state being set as a result of the fact that, on detecting a locked power train of the motor vehicle and a cutoff fuel supply, a throttle valve of the internal combustion engine is at least opened to such an extent that the intake pipe pressure exceeds the pressure threshold. 3. The method according to claim 1, wherein the motor vehicle being a hybrid vehicle in which the crankshaft can optionally be driven in a combustion mode by the internal combustion engine or in an electric mode by an electric motor and whereby, in order to carry out the functional testing of the pressure switch the motor vehicle is switched over into the electric mode, andthrottle valve of the internal combustion engine is at least opened to such an extent that the intake pipe pressure exceeds the pressure threshold. 4. The method according to claim 1, wherein the pressure switch only being detected as defective when said switch is in the low-pressure position after the expiry of a given period of time since the actuation of the tank vent valve. 5. The method according to claim 1, further comprising assessing the pressure switch as operable if it is in the low-pressure position after an additional action taking place after the actuation of the tank vent valve, wherein the additional action leads to a pressure drop in the tank vent device below the pressure threshold. 6. The method according to claim 5, wherein the additional action results in a further operating state of the internal combustion engine in which the intake pipe pressure is below the pressure threshold, the tank vent valve being actuated in such a way that the tank vent device and the intake pipe are pneumatically connected. 7. The method according to claim 1, further comprising: detecting the switching state of the pressure switch before the actuation of the tank vent valve,only actuating the tank vent valve if the pressure switch is in the low-pressure position, andassessing the pressure switch as operable if the pressure switch is in the high-pressure position after the actuation of the tank vent valve. 8. The method according to claim 1, wherein the method only being carried out up to a given limiting rotational speed of the crankshaft. 9. The method according to claim 1, wherein the pressure switch only being assessed if a functional testing of the tank vent valve was carried out and this resulted in the fact that the tank vent valve is operable. 10. A control device for a motor vehicle, the control device being coupled with a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, with the pressure switch being located in a low-pressure position if the pressure in the tank vent device is lower than a pressure threshold, and said pressure switch otherwise being in a high-pressure position, wherein the control device is operable: in an operating state in which a crankshaft of the internal combustion engine rotates and the pressure in an intake pipe of the internal combustion engine exceeds the pressure threshold, to actuate a tank vent valve of the tank vent device, said valve being disposed in a connecting line between a fuel vapor reservoir and the intake pipe, in such a way that the tank vent device and the intake pipe are pneumatically connected, andto assess the pressure switch as defective if the pressure switch is in the low-pressure position after actuation of the tank vent valve. 11. The control device according to claim 10, wherein the control device is further operable to set the operating state as a result of the fact that, on detecting a locked power train of the motor vehicle and a cutoff fuel supply, a throttle valve of the internal combustion engine is at least opened to such an extent that the intake pipe pressure exceeds the pressure threshold. 12. The control device according to claim 10, wherein the motor vehicle being a hybrid vehicle in which the crankshaft can optionally be driven in a combustion mode by the internal combustion engine or in an electric mode by an electric motor and whereby, in order to carry out the functional testing of the pressure switch the motor vehicle is switched over into the electric mode, anda throttle valve of the internal combustion engine is at least opened to such an extent that the intake pipe pressure exceeds the pressure threshold. 13. The control device according to claim 10, wherein the control device is further operable to detect the pressure switch only as defective when said switch is in the low-pressure position after the expiry of a given period of time since the actuation of the tank vent valve. 14. The control device according to claim 10, wherein the control device is further operable to carry out an additional action after the actuation of the tank vent valve, wherein the additional action leads to a pressure drop in the tank vent device below the pressure threshold, and to assess the pressure switch is assessed as operable if it is in the low-pressure position after the additional action takes place. 15. The control device according to claim 14, wherein the additional action results in a further operating state of the internal combustion engine in which the intake pipe pressure is below the pressure threshold, the tank vent valve being actuated in such a way that the tank vent device and the intake pipe are pneumatically connected. 16. The control device according to claim 10, further comprising the control device operable to: detect the switching state of the pressure switch before the actuation of the tank vent valve,only actuate the tank vent valve if the pressure switch is in the low-pressure position, andassessing the pressure switch as operable if it is in the high-pressure position after the actuation of the tank vent valve. 17. The control device according to claim 10, wherein the control device is further operable to the assessment only being carried out up to a given limiting rotational speed of the crankshaft. 18. The control device according to claim 10, wherein the control device is further operable to assess the pressure switch only if a functional testing of the tank vent valve was carried out and this resulted in the fact that the tank vent valve is operable. 19. A motor vehicle, comprising a control device being coupled with a pressure switch of a tank vent device for an internal combustion engine of the motor vehicle, with the pressure switch being located in a low-pressure position if the pressure in the tank vent device is lower than a pressure threshold, and said pressure switch otherwise being in a high-pressure position, wherein the control device is operable: in an operating state in which a crankshaft of the internal combustion engine rotates and the pressure in an intake pipe of the internal combustion engine exceeds the pressure threshold, to actuate a tank vent valve of the tank vent device, said valve being disposed in a connecting line between a fuel vapor reservoir and the intake pipe, in such a way that the tank vent device and the intake pipe are pneumatically connected, andto assess the pressure switch as defective if the pressure switch is in the low-pressure position after actuation of the tank vent valve. 20. The motor vehicle according to claim 19, wherein the motor vehicle is a hybrid vehicle in which the crankshaft can optionally be driven in a combustion mode by the internal combustion engine or in an electric mode by an electric motor and whereby, in order to carry out the functional testing of the pressure switch the motor vehicle is switched over into the electric mode, anda throttle valve of the internal combustion engine is at least opened to such an extent that the intake pipe pressure exceeds the pressure threshold.
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