# US 9,752,910 B2 · Sensor system for determining at least one parameter of a fluid medium flowing through a channel

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- Number: US 9,752,910 B2
- Document ID: US9752910B2
- Status: Granted
- Kind: B2
- Application number: 14/573,724
- Filed: 2014-12-17
- Published: 2015-06-18
- Granted: 2017-09-05
- Earliest claimed: 2013-12-18
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Ulrich Wagner; Torsten Mais
- Web page: https://patentgrep.com/patent/US9752910B2

## CPC

- G01F 1/692: Thin-film arrangements
- F02D 41/187: {using a hot wire flow sensor}
- G01F 1/6842: {with means for influencing the fluid flow}
- G01F 5/00: Measuring a proportion of the volume flow
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)

## Abstract

A sensor system is provided for determining at least one parameter of a fluid medium flowing through a channel, in particular an intake air mass flow of an internal combustion engine. The sensor system includes a sensor housing, in particular a plug-in sensor which is introduced or is introducible into a flow tube, in which the channel is formed, and at least one sensor chip which is situated in the channel for determining the parameter of the fluid medium. The sensor housing has an inlet into the channel which points counter to a main flow direction of the fluid medium, and at least one outlet from the channel in a surface of the sensor housing. The surface of the sensor housing has multiple recesses upstream from the outlet viewed in the main flow direction.

## Claims

### Claim 1

A sensor system for determining at least one parameter of a fluid medium flowing through a channel, comprising:
a sensor housing which is introduced or is introducible into a flow tube, in which the channel is formed; and
at least one sensor chip situated in the channel and for determining the parameter of the fluid medium, wherein:
the sensor housing includes:
an inlet into the channel which points counter to a main flow direction of the fluid medium, and
at least one outlet from the channel in a surface of the sensor housing, and
the surface of the sensor housing has multiple recesses upstream from the outlet and downstream from the inlet as viewed in the main flow direction.

### Claim 2 (depends on 1)

The sensor system as recited in claim 1, wherein the fluid medium includes an intake air mass flow of an internal combustion engine.

### Claim 3 (depends on 1)

The sensor system as recited in claim 1, wherein the sensor housing includes a plug-in sensor.

### Claim 4 (depends on 1)

The sensor system as recited in claim 1, wherein the recesses are spaced apart from each other.

### Claim 5 (depends on 1)

The sensor system as recited in claim 1, wherein the recesses are formed as grooves.

### Claim 6 (depends on 1)

The sensor system as recited in claim 1, wherein the recesses are formed perpendicularly to the main flow direction.

### Claim 7 (depends on 1)

The sensor system as recited in claim 1, wherein the recesses lie on a shared circular path of the sensor housing between the inlet and the outlet.

### Claim 8 (depends on 1)

The sensor system as recited in claim 1, wherein the surface of the sensor housing has a step having a separation edge downstream from the outlet as viewed in the main flow direction, the step being adjacent to the outlet.

### Claim 9 (depends on 8)

The sensor system as recited in claim 8, wherein the surface has a further step having a separation edge upstream from the outlet as viewed in the main flow direction, the upstream step being adjacent to the outlet.

### Claim 10 (depends on 9)

The sensor system as recited in claim 9, wherein at least one of the upstream step and the downstream step forms a chimney-like projection from the surface.

### Claim 11 (depends on 9)

The sensor system as recited in claim 9, wherein at least one of the downstream step and the upstream step protrudes perpendicularly from the surface.

### Claim 12 (depends on 9)

The sensor system as recited in claim 9, wherein at least one of the downstream step and the upstream step extends at least partially perpendicularly to the main flow direction.