Method and device for characterizing an injector

Patent metadata

Field	Value
Publication number	US-10077751-B2
Application number	US-201515322050-A
Country	US
Kind code	B2
Filing date	May 8, 2015
Priority date	Jun 27, 2014
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

The invention relates to a device for determining the mass of fluid ( 2 ) discharged by an injector ( 13 ), the device comprising a housing ( 1 ) which is impermeable to fluid and which serves for storing fluid, said housing having an injector port ( 11 ) for the connection, in particular of an inlet ( 12 ), of the injector ( 13 ) and having a fluid port ( 8 ) for the infeed of fluid ( 2 ), wherein at least one pressure sensor ( 3 ) for pressure measurement is provided in the housing ( 1 ) in order, by way of an evaluation unit ( 17 ), to determine the mass of the fluid ( 2 ) in the housing ( 1 ) in a manner dependent on the determined pressure.

First claim

What is claimed is:

1. A device for determining the mass of a fluid ( 2 ) delivered by an injector ( 13 ), comprising a fluid-impermeable housing ( 1 ) for fluid storage, the latter comprising an injector connection ( 11 ) configured to be connected to the injector ( 13 ) and a fluid connection ( 8 ) for feeding fluid ( 2 ) in, characterized in that at least one pressure sensor ( 3 ) for pressure measurement is provided in the housing ( 1 ), in order to determine the mass of the fluid ( 2 ) in the housing ( 1 ) by means of an evaluation unit ( 17 ) on the basis of the pressure determined before and after delivery of fluid ( 2 ) by the injector ( 13 ), and in that the evaluation unit ( 17 ) additionally evaluates the measurement values of a temperature sensor ( 4 ) and/or sound wave sensor ( 7 ) before and after delivery of fluid ( 2 ) by the injector ( 13 ) in order to determine the mass of the fluid ( 2 ) delivered by the injector ( 13 ) on a single-shot basis, and wherein the injector connection ( 11 ) is configured to be connected to an inlet ( 12 ) of the injector ( 13 ).

2. The device as claimed in claim 1 , characterized in that at least one temperature means ( 4 ; 5 ) for temperature measurement or temperature regulation of the fluid ( 2 ) in the housing ( 1 ) is provided in the housing ( 1 ).

3. The device as claimed in claim 2 , characterized in that the at least one temperature means comprises the temperature sensor ( 4 ).

4. The device as claimed in claim 2 , characterized in that the at least one temperature means comprises a temperature regulator ( 5 ).

5. The device as claimed in claim 1 , characterized in that a sound wave emitter ( 6 ) and the sound wave sensor ( 7 ) are fitted on or in the housing, in order to measure properties of the propagation of sound through the fluid ( 1 ) inside the housing ( 1 ).

6. The device as claimed in claim 1 , characterized in that a container ( 14 ) for connection to an outlet of the injector ( 13 ) is provided.

7. The device as claimed in claim 1 , characterized in that the fluid ( 2 ) is a gas from a group of gases to which the air, nitrogen and fuel gas are assigned.

8. A method for determining the mass of fluid ( 2 ) delivered by an injector ( 13 ) by an inlet ( 12 ) of the injector ( 13 ) being connected to the injector connection ( 11 ) of a device as claimed in claim 1 , a fluid ( 2 ) being conveyed through the fluid connection ( 8 ) into the housing, the pressure of the fluid ( 2 ) in the housing ( 1 ) being measured by the pressure sensor ( 3 ) and read out by the evaluation unit ( 17 ), fluid ( 2 ) subsequently being delivered from the housing ( 1 ) by the injector ( 13 ), the pressure of the fluid ( 2 ) in the housing ( 1 ) subsequently being measured again by the pressure sensor ( 3 ) and read out by the evaluation unit ( 17 ), and the mass of the fluid ( 2 ) in the housing ( 1 ) before and after delivery of fluid ( 2 ) by the injector ( 13 ) being calculated by the evaluation unit ( 17 ) by means of the previously determined measurement values on a single-shot basis, and wherein, for this calculation of the mass of the fluid ( 2 ) on a single-shot basis, before and after delivery of fluid ( 2 ) by the injector ( 13 ), the temperature of the fluid ( 2 ) is determined by the temperature means ( 4 ) and read out by the evaluation unit ( 17 ) and/or the speed of sound in the fluid ( 2 ) is determined by the sound wave sensor ( 7 ) and read out by the evaluation unit ( 17 ).

9. The method as claimed in claim 8 , characterized in that the fluid ( 2 ) is delivered by the injector ( 13 ) into a container ( 14 ) with a predefined pressure.

10. A method for determining the mass of fluid ( 2 ) delivered by an injector ( 13 ) by an inlet ( 12 ) of the injector ( 13 ) being connected to a fluid container ( 10 ), the injector being connected on the outlet side to the fluid connection ( 8 ) of a device as claimed in claim 1 , the pressure of the fluid ( 2 ) in the housing ( 1 ) being measured by the pressure sensor ( 3 ) and read out by the evaluation unit ( 17 ), fluid ( 2 ) subsequently being delivered into the housing ( 2 ) by the injector ( 13 ), the pressure of the fluid ( 2 ) in the housing ( 1 ) subsequently being measured again by the pressure sensor ( 3 ) and read out by the evaluation unit ( 17 ), and the mass of the fluid ( 2 ) in the housing ( 1 ) before and after delivery of fluid ( 2 ) by the injector ( 13 ) being calculated by the evaluation unit ( 17 ) by means of the previously determined measurement values on a single-shot basis, and wherein, for this calculation of the mass of the fluid ( 2 ) on a single-shot basis, before and after delivery of fluid ( 2 ) by the injector ( 13 ), the temperature of the fluid ( 2 ) is determined by the temperature means ( 4 ) and read out by the evaluation unit ( 17 ) and/or the speed of sound in the fluid ( 2 ) is determined by the sound wave sensor ( 7 ) and read out by the evaluation unit ( 17 ).

11. The device as claimed in claim 1 , characterized in that a sound wave emitter ( 6 ) and the sound wave sensor ( 7 ) are fitted on or in the housing, in order to measure the speed of sound inside the housing ( 1 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Majer Clemens
• Fischer Thomas
• Hartung Iris

Classifications

• G01F22/02

  involving measurement of pressure · CPC title

• G01F1/34

  by measuring pressure or differential pressure · CPC title

• G01F1/68

  by using thermal effects · CPC title

• F02D2200/0614

  Actual fuel mass or fuel injection amount · CPC title

• F02M65/001 Primary

  Measuring fuel delivery of a fuel injector · CPC title