IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0980393
(2000-06-15)
|
우선권정보 |
FR-1999-907982 (1999-06-18) |
국제출원번호 |
PCT/FR00/01660
(2000-06-15)
|
국제공개번호 |
WO00/79125
(2000-12-28)
|
발명자
/ 주소 |
- Schmidt, Francois
- Eynard, Pierre
- Maurin, Bernard
- Gauthier, Christian
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
5 |
초록
▼
The measuring device includes a first measuring chamber ( 8 ) into which fuel is injected, pressure sensor ( 62 ) and a temperature sensor ( 60 ) respectively measuring pressure and temperature in the first measuring chamber ( 8 ), devices enabling the measuring chamber to be at least partially drai
The measuring device includes a first measuring chamber ( 8 ) into which fuel is injected, pressure sensor ( 62 ) and a temperature sensor ( 60 ) respectively measuring pressure and temperature in the first measuring chamber ( 8 ), devices enabling the measuring chamber to be at least partially drained, an electronic section controlling the system and analyzing information received from the sensors ( 46, 60, 62 ). The device also includes a second measuring chamber ( 20 ) arranged downstream from the first measuring chamber ( 8 ). Fuel which is drained from the first measuring chamber ( 8 ) is sent to said second chamber. The volume of the second measuring chamber ( 20 ) can vary according to the displacement of a piston ( 38 ). The displacement is measured with the aid of a displacement sensor ( 46 ).
대표청구항
▼
1. A device for measuring a quantity of fuel injected by an injector ( 2 ) used in a combustion engine including;a first measuring chamber ( 8 ) into which the fuel is injected,a pressure sensor ( 62 ) respectively measuring the pressure in the first measuring chamber ( 8 ),a temperature sensor ( 60
1. A device for measuring a quantity of fuel injected by an injector ( 2 ) used in a combustion engine including;a first measuring chamber ( 8 ) into which the fuel is injected,a pressure sensor ( 62 ) respectively measuring the pressure in the first measuring chamber ( 8 ),a temperature sensor ( 60 ) measuring the temperature in the first measuring chamber ( 8 ),downstream of the first chamber ( 8 ), a second measuring chamber ( 20 ) which is connected to the first chamber ( 8 ) by a drain pipe ( 18 ) and the volume of which can vary according to the movement of a piston ( 38 ), the displacement of which is measured using a displacement sensor ( 46 ),means for draining the first measuring chamber ( 8 ) at least partially,means for draining the second measuring chamber ( 20 ) at least partially,an electronic section analyzing information received through the sensors ( 46 , 60 , 62 ) and controlling the draining means of the first chamber ( 8 ) and the second chamber ( 20 ) in particular, characterized in that:the means of draining the first chamber ( 8 ) into the second chamber ( 20 ) includes a high-speed valve ( 32 ),the means of draining the second chamber ( 20 ) includes a high-speed valve ( 52 ),the electronic section is designed to control the means of draining the first chamber ( 8 ) and the second chamber ( 20 ) so as, on the one hand, to partially drain the first measuring chamber ( 8 ) after each injection until the pressure in the first measuring chamber ( 8 ) after each injection until the pressure in the first measuring chamber returns to essentially the pressure that was in this chamber prior to this injection and, on the other hand, to partly drain the second chamber ( 20 ) after each measurement of the volume of each injection. 2. The measuring device as claimed in claim 1, characterized in that the electronic section comprises a compensating device to make it possible to take account of any pressure difference there might be in the first measuring chamber ( 8 ) after two successive drainings. 3. The measuring device as claimed in claim 1, characterized in that the means of draining the first measuring chamber ( 8 ) comprise a back-pressure regulator ( 34 ). 4. The measuring device as claimed in claim 1, characterized in that the means of draining the second measuring chamber ( 20 ) comprise a back-pressure regulator ( 54 ) intended to keep the pressure in the second chamber at a reference value. 5. The measuring device as claimed in claim 1, characterized in that the piston ( 38 ) is preloaded by a spring ( 44 ) urging it toward the second measuring chamber ( 20 ). 6. The measuring device as claimed in claim 1, characterized in that the piston ( 38 ) moves in a smooth-walled cylinder ( 36 ) and in that it comprises an annular groove ( 56 ) open toward the wall of the cylinder ( 36 ). 7. The measuring device as claimed in claim 1, characterized in that it includes a cooling system for cooling the injector ( 2 ), the first measuring chamber ( 8 ), the piston ( 38 ) and the piston displacement sensor ( 46 ). 8. The measuring device as claimed in claim 7, characterized in that the fluid used in the cooling system is the same as the fluid used for performing the injections. 9. A method for measuring characteristics of an injection of fuel performed by an injector of the type consisting in using a first chamber for measuring the pressure and the temperature of injection and a second chamber for measuring the volume of fuel injected, characterized in that it further consists, in particular, for each injection;in measuring the pressure and the temperature in the first chamber prior to the injection,in injecting fuel into the fuel chamber using the injector,changing a volume of the second chamber as the drained fuel enters the second chamber,during injection, measuring, at least regularly, the pressure and the temperature in the first chamber,at the end of injection, draining some of the fuel contained in the first ch amber into the second chamber until the pressure in the first chamber returns roughly to the pre-injection pressure,maintaining a constant volume of the first chamber prior to, during and after injection,measuring the volume of the drained fuel and from it deducing the volume of the injection,draining some of the fuel contained in the second chamber. 10. The measuring method as claimed in claim 9, characterized in that it consists in correcting the values relating to each injection using, in particular, prerecorded calibration. 11. The measuring method as claimed in claim 9, characterized in that it consists, when draining the second chamber, in performing this draining until a reference pressure is established in that chamber.
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