CN117203504A - Air mass flow sensor and motor vehicle - Google Patents
Air mass flow sensor and motor vehicle Download PDFInfo
- Publication number
- CN117203504A CN117203504A CN202280026251.XA CN202280026251A CN117203504A CN 117203504 A CN117203504 A CN 117203504A CN 202280026251 A CN202280026251 A CN 202280026251A CN 117203504 A CN117203504 A CN 117203504A
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- China
- Prior art keywords
- channel
- wall element
- air mass
- mass flow
- housing
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- 230000007423 decrease Effects 0.000 claims abstract 2
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims 6
- 230000005284 excitation Effects 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 230000010349 pulsation Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention relates to an air mass flow sensor for determining an air mass flow, comprising a housing (4) and sensor electronics (6), wherein the sensor electronics are arranged at least partially in a housing chamber (8) of the housing (4), wherein the housing (4) has a flow channel (14) for guiding an air mass flow (L) to be measured through the housing (4), the flow channel (14) has a measuring channel (20) and a bypass channel (22), wherein the measuring channel (20) guides a portion of the air mass flow (L) flowing into the flow channel (14) to a measuring point (24) of the sensor electronics (6), and wherein the bypass channel (22) branches off before reaching the measuring point (24) and discharges from the housing (4), wherein the bypass channel (22) and the measuring channel (2) have at least a first wall section (28) which is separated from one another by at least one wall section (28) or at least one wall section (28) which has a wall section (28), the first wall element (28) can be flowed through, and the second wall element (33) separating the bypass channel (22) and the inlet (16) of the flow channel (14) from each other at least in sections has a wall height (H3) that decreases at least in sections, so that the second wall element (28) can be overflowed at least in sections, and/or the second wall element (28) has a through-opening (34) so that the second wall element (28) can be flowed through.
Description
Technical Field
The invention relates to an air mass flow sensor for determining an air mass flow, comprising a housing and sensor electronics, wherein the sensor electronics are arranged at least partially in a housing chamber of the housing, and wherein the housing has a flow channel for guiding an air mass flow to be measured through the housing. The invention further relates to a motor vehicle having such an air mass flow sensor.
Background
Air mass flow sensors of the type mentioned at the outset are known, for example, from documents US 8,763,425B2 and DE 1020018219729 A1.
Such a mass air flow sensor can be used, for example, to determine the mass air flow in an intake line of an internal combustion engine of a motor vehicle. In this case, vibration excitations may occur in the region of the natural frequency of the flow channel, which have an adverse effect on the measurement result. Thus, for example, an exhaust gas turbocharger may cause high-frequency pressure pulsations of up to 20kHz in the air mass flow to be measured. Thus, for a particular excitation frequency or excitation frequency range, a severe deviation between the measured air mass flow and the actual air mass flow may occur. These deviations may adversely affect engine operation.
Disclosure of Invention
Against this background, the invention is based on the problem of specifying an improved air mass flow sensor which is particularly more robust with respect to the vibration excitation of an exhaust gas turbocharger. Furthermore, a motor vehicle having such a sensor should be described.
According to a first aspect, the invention relates to an air mass flow sensor for determining an air mass flow, having a housing and sensor electronics, wherein the sensor electronics are arranged at least partially in a housing chamber of the housing, and wherein the housing has a flow channel for guiding an air mass flow to be measured through the housing, the flow channel having a measuring channel and a bypass channel, wherein the measuring channel guides a part of the air mass flow flowing into the flow channel to a measuring point of the sensor electronics, and wherein the bypass channel branches off a part of the air mass flow flowing into the flow channel before reaching the measuring point and is discharged from the housing.
The air mass flow sensor is characterized in that a first wall element separating the bypass channel and the measuring channel from each other at least in sections has a wall height which is reduced at least in sections so that the first wall element can be overflowed at least in sections and/or in that the first wall element has through-openings so that the first wall element can be flown through. Alternatively or additionally, the air mass flow sensor is characterized in that a second wall element separating the bypass channel and the inlet of the flow channel from each other at least in sections has an at least section-wise reduced wall height, so that the second wall element can be overflowed at least in sections, and/or in that the second wall element has through-openings, so that the second wall element can be flown through.
The reduced wall height and/or the through-hole thus enables an additional fluid connection within the flow channel for providing an additional pressure compensation for the measurement channel. In this way, in particular, the amplitude of the vibration excitation caused by the high-frequency pressure pulsations of the turbocharger can be reduced, so that reliable measurements can also be made for critical excitation frequencies. In particular, the natural frequency of the flow channel can be eliminated in this way or the corresponding vibration response in the region of one or more natural frequencies can be reduced.
The first wall element can be arranged between a discharge section of the measuring channel, which discharge section is formed downstream of the measuring point, and the bypass channel. The reduced wall height thus forms a fluid connection between the bypass channel and the discharge section of the measuring channel, so that a part of the air mass flow can flow from the bypass channel into the discharge section of the measuring channel.
By downstream is meant that the air mass flow overflows later in time than the elements arranged upstream or flows through the relevant elements. The inlet opening of the measuring channel is thus arranged upstream of the measuring point, while the outlet opening of the measuring channel is arranged downstream of the measuring point.
In particular, it can be provided that a gap or through-hole is formed between the first wall element and the cover or lid of the housing, at least in the region of reduced wall height, for establishing a fluid connection between the bypass channel and the outlet section of the measuring channel. It can be provided that the first wall element can be overflowed in sections or along its entire length.
It can be provided that the wall height of the first wall element in the region of the outlet section of the bypass channel is greater than the reduced wall height, in the region of which the wall element can be overflowed. In particular, the reduced wall height can be arranged adjacent to the entry region of the bypass channel. It can be provided that the first wall element can be overflowed both in the region of the reduced wall height and in the region of the discharge section.
In particular, it can be provided that a gap or through-hole is formed between the second wall element and the cover or lid of the housing in the region of reduced wall height for establishing a fluid connection between the inlet of the flow channel and the bypass channel. It can be provided that the second wall element can be overflowed in sections or along its entire length.
The inlet of the flow channel can be widened in a funnel-like manner for reducing vibration excitation due to high-frequency pressure pulsations.
The air mass flow sensor can have a complementary function in addition to measuring the air mass flow. For example, the air mass flow sensor can be set up to measure one or more of the following parameters in addition to the air mass flow: the pressure of the air mass flow; humidity of the air mass flow; temperature of the air mass flow.
The measuring element of the sensor electronics of the air mass flow sensor can be a thermal measuring element, in particular a hot-film air mass measuring element. Such a hot-film air mass measuring element can, for example, have at least one heating element and two temperature sensors, which are overflowed by an air mass flow, wherein the magnitude of the air mass flow can be deduced from the measured temperatures or temperature profiles of the temperature sensors, which differ from one another. Such a hot-film air quality measuring element is described, for example, in DE 1020010200719729 A1.
It can be provided that components of the sensor electronics which are arranged in the housing or the electronic chamber of the air mass flow sensor are at least partially or completely encapsulated in or by the potting compound in order to protect the components of the sensor electronics from the environment.
It can be provided that the flow channel and the electronic chamber are connected to one another by an opening, wherein the electronic chamber forms a pressure compensation space for the flow channel. The opening thus enables a fluid connection between the flow channel and the electronics compartment, so that a part of the air mass flow to be measured can flow from the flow channel into the electronics compartment. In this way, in particular, the amplitude of the vibration excitation of the turbocharger due to the high-frequency pressure pulses can also be reduced, so that reliable measurements can also be made for critical excitation frequencies. In particular, the natural frequency of the flow channel can also be eliminated in this way or the corresponding vibration response in the range of one or more natural frequencies can be reduced.
It can be provided that the housing has, in addition to the inlet opening and the outlet opening of the flow channel, at least one compensation opening which connects the flow channel to the environment of the housing. The compensation opening can thus provide a fluid connection between the flow channel and the surroundings of the housing, so that a part of the air mass flow to be measured can flow from the flow channel into the surroundings of the housing in order to provide additional pressure compensation. In this way, in particular, the amplitude of the vibration excitation caused by the high-frequency pressure pulsations of the turbocharger can also be reduced, so that reliable measurements can also be made for critical excitation frequencies. In particular, in this way, the natural frequency of the flow channel can also be eliminated or the corresponding vibration response in the range of one or more natural frequencies can be reduced.
Exactly one compensation opening or two or more compensation openings can be provided.
The surroundings of the housing can in particular be the interior of a pipe, a line or the like, inside which the air mass flow sensor for determining the air mass flow is arranged.
The compensation opening can be a through hole, such as a bore or the like, hollowed out into the wall of the housing.
Alternatively or additionally, the compensation opening can be formed between the housing parts of the housing. As long as the housing has, for example, a first housing part and a second housing part which are assembled to form the housing, the compensation opening can be a recess in the region of the seam or the joint edge, in which the first and second housing parts engage in a form-fitting manner and/or are connected to one another. The first housing part can be, for example, a cover or a lid part. The second housing part can be a base body of the housing, to which the cover is fastened.
The housing parts can be connected to one another by means of an adhesive, wherein the compensation opening is at least partially adjoined by the adhesive that connects the housing parts.
It can be provided that the compensation opening is part of an interrupted adhesive seam or of an interrupted adhesive strip. The compensation opening can thus be an adhesive seam or an interruption of an adhesive strip connecting the housing parts to each other. In particular, the adhesive seam or the adhesive strip forms an adhesive connection of the housing parts and furthermore forms a seal of the flow channel with respect to the environment, wherein the seal is locally interrupted in order to form the compensation opening.
According to a second aspect, the invention relates to a motor vehicle having an air mass flow sensor according to the invention.
The motor vehicle can have an internal combustion engine, wherein the air mass flow sensor is arranged in an intake line of the internal combustion engine in order to measure the air mass flow in the interior of the intake line. The internal combustion engine can have one or more turbochargers.
Drawings
The invention is described in detail below with the aid of the figures showing embodiments. The figures are schematically shown below, respectively:
fig. 1 shows an air mass flow sensor according to the invention in a perspective view from above;
FIG. 2 illustrates the air mass flow sensor of FIG. 1 without a cover or lid;
FIG. 3 shows an enlarged view of FIG. 2;
FIG. 4 shows a cross section of the air mass flow sensor of FIG. 1;
fig. 5 shows an enlarged view of fig. 4;
fig. 6 shows another enlarged view of fig. 2;
FIG. 7 shows a cross section of an air mass flow sensor;
fig. 8 shows a motor vehicle according to the invention.
Detailed Description
The air mass flow sensor 2 has a housing 4. The air mass flow sensor 2 has sensor electronics 6, wherein the sensor electronics 6 are arranged in a housing or electronic chamber 8 of the housing 4 (fig. 2). In order to illustrate the electronic chamber 8 and the sensor electronics 6, the covers 10, 12 or covers 10, 12 of the housing 4 are omitted in fig. 2.
The housing 4 has a flow channel 14 for guiding the air mass flow L to be measured through the housing 4.
The flow channel 14 has an inlet opening 16 for introducing the air mass flow L into the housing 4. The flow channel 14 has an outlet opening 18 for the air mass flow L to be conducted out of the housing 4. The inlet opening 16 or inlet 16 of the flow channel 14 widens in a funnel-like manner.
The flow channel 14 has a measurement channel 20 and a bypass channel 22. The measuring channel 20 leads a part of the air mass flow L flowing into the flow channel 14 to a measuring point 24 of the sensor electronics 6. The bypass channel 22 branches off a part of the air mass flow L flowing into the flow channel 14 before reaching the measuring point 24 and is discharged from the housing 4.
In the region of the measuring point 24, a measuring element 24 of the sensor electronics 6 is arranged. The measuring element 26 is a thermal measuring element 26 and is to be understood as a thermal film air mass measuring element 26.
Fig. 3 shows an enlarged view of a section of fig. 2.
The first wall element 28 of the housing 4, which separates the bypass channel 22 and the measuring channel 20 from each other at least in sections, has an at least in sections reduced wall height H1, so that the first wall element 28 can be overflowed at least in sections. The first wall element 28 is arranged between a discharge section 30 of the measuring channel 20 and the bypass channel 22, wherein the discharge section 30 is formed downstream of the measuring point 24.
As shown in fig. 3, a part of the air mass flow L flows out of the bypass channel 22 into the outlet section 30 of the measuring channel 20 over the wall 28. Thus, there is a through hole 32 between the cover 12 and the wall 28 for establishing a fluid connection between the bypass channel 22 and the discharge section 30 of the measurement channel 20.
Fig. 4 shows a cross section of the air mass flow sensor 2 according to fig. 2. As can be seen from the enlarged view according to fig. 5, a gap 31 or a slit 31 can also be formed between the cover 12 and the first wall element 28 in the region of the wall height H2, so that the first wall element 28 can also be overflowed in the region of the wall height H2. According to an alternative embodiment of the invention, it can be provided that the cover 12 rests without gaps against the wall element 28 in the region of the wall height H2, so that the wall element 28 can only be overflowed in the region of the wall height H1.
Fig. 6 shows a cross section of the air mass flow sensor 2, wherein it is illustrated that the second wall element 33 of the housing 4, which separates the bypass channel 22 of the flow channel 14 and the inlet 16 from each other at least in sections, has an at least in sections reduced wall height H3, so that the second wall element 33 can be overflowed at least in sections. As shown in fig. 5, a gap 35 is thus also formed between the cover 12 and the second wall element 33, so that the second wall element 33 can be overflowed.
Alternatively or additionally, through holes 34 can be cut into the first wall element 28, so that the first wall element 28 can be flowed through (fig. 7). The same applies to the second wall element 33.
Fig. 8 shows a motor vehicle 100 having a turbocharged internal combustion engine 110 and having an air mass flow sensor 2, wherein the air mass flow sensor 2 is arranged in an intake line 120 of the internal combustion engine 110 in order to measure the air mass flow in the interior of the intake line 120. The intake line 120 is connected to a charge air cooler 130.
According to an alternative embodiment of the invention, the motor vehicle 100 can be a hybrid vehicle, which has at least one electric motor with an associated traction battery as a complement to the internal combustion engine 110.
Claims (7)
1. A mass airflow sensor for determining a mass airflow,
-has a housing (4), and
-having sensor electronics (6),
wherein the sensor electronics (6) are arranged at least partially in a housing chamber (8) of the housing (4),
wherein the housing (4) has a flow channel (14) for guiding a mass flow of air (L) to be measured through the housing (4),
the flow channel (14) has a measuring channel (20) and a bypass channel (22),
-wherein the measuring channel (20) directs a portion of the air mass flow (L) flowing into the flow channel (14) to a measuring point (24) of the sensor electronics (6), and
wherein the bypass channel (22) branches off a portion of the air mass flow (L) flowing into the flow channel (14) before reaching the measuring point (24) and is discharged from the housing (4),
it is characterized in that the method comprises the steps of,
-a first wall element (28) separating the bypass channel (22) and the measuring channel (2) from each other at least in sections has an at least section-wise reduced wall height (H1) such that the first wall element (28) can be overflowed at least in sections, and/or the first wall element (28) has a through-opening (34) such that the first wall element (28) can be flown through, and/or
A second wall element (33) separating the bypass channel (22) and the inlet (16) of the flow channel (14) from each other at least in sections has a wall height (H3) which decreases at least in sections, such that the second wall element (28) can be overflowed at least in sections, and/or the second wall element (33) has a through-opening (34) such that the second wall element (28) can be flown through.
2. The air mass flow sensor of claim 1,
it is characterized in that the method comprises the steps of,
-the first wall element (28) is arranged between a discharge section (30) of the measuring channel (20) formed downstream of a measuring point (24) and the bypass channel (22).
3. The air mass flow sensor of claim 2,
it is characterized in that the method comprises the steps of,
-the wall height (H2) of the wall element (28) in the region of the discharge section of the bypass channel (22) is greater than the reduced wall height (H1), in which region the wall element (28) can be overflowed.
-wherein the wall element (28) can in particular also be overflowed in the region of the wall height (H2) or can only be overflowed in the region of the reduced wall height (H1).
4. An air mass flow sensor according to any preceding claim,
it is characterized in that the method comprises the steps of,
-the inlet of the flow channel widens funneled.
5. An air mass flow sensor according to any preceding claim,
it is characterized in that the method comprises the steps of,
-a gap (31, 32, 35) is formed between the cover (12) of the housing (4) and the first wall element (28) and/or the second wall element (33) of the housing (4), in the region of which gap the first wall element (28) and/or the second wall element (33) can be overflowed.
6. The vehicle body of the motor vehicle is provided with a first control device,
it is characterized in that
-a mass air flow sensor (2) according to any of claims 1-5.
7. A motor vehicle according to claim 5,
-having an internal combustion engine (110),
it is characterized in that the method comprises the steps of,
-the air mass flow sensor (2) is arranged in an intake line (120) of the internal combustion engine (110) for measuring the air mass flow (L) inside the intake line (120).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021203214.1 | 2021-03-30 | ||
| DE102021203214.1A DE102021203214B3 (en) | 2021-03-30 | 2021-03-30 | Air mass sensor and motor vehicle |
| PCT/EP2022/056957 WO2022207334A1 (en) | 2021-03-30 | 2022-03-17 | Air mass sensor and motor vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117203504A true CN117203504A (en) | 2023-12-08 |
Family
ID=81076796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280026251.XA Pending CN117203504A (en) | 2021-03-30 | 2022-03-17 | Air mass flow sensor and motor vehicle |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2024513415A (en) |
| CN (1) | CN117203504A (en) |
| DE (1) | DE102021203214B3 (en) |
| WO (1) | WO2022207334A1 (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0672793B2 (en) * | 1986-01-08 | 1994-09-14 | 株式会社日立製作所 | Flow rate detector |
| DE4112981A1 (en) * | 1991-04-20 | 1992-10-22 | Bosch Gmbh Robert | Wt. measuring arrangement for flowing, gaseous medium, esp. in IC engine air induction system - has hot film air mass sensor in by=pass channel opening in min. cross=section region of venturi section |
| JPH1114421A (en) | 1997-06-23 | 1999-01-22 | Hitachi Ltd | Heating resistor-type air-flow-rate measuring instrument |
| KR20010039993A (en) * | 1999-10-06 | 2001-05-15 | 오카무라 가네오 | Flow Rate and Flow Velocity Measurement Device |
| JP5262155B2 (en) | 2008-02-06 | 2013-08-14 | 株式会社Ｉｈｉ | Turbo compressor and refrigerator |
| JP5256264B2 (en) | 2010-09-03 | 2013-08-07 | 日立オートモティブシステムズ株式会社 | Thermal air flow sensor |
| DE102012200151A1 (en) | 2012-01-05 | 2013-07-11 | Robert Bosch Gmbh | Sensor device for determining parameter of liquid medium flowing through channel, particularly intake air mass of internal combustion engine, has housing, which forms electronic compartment |
| JP5675707B2 (en) | 2012-06-15 | 2015-02-25 | 日立オートモティブシステムズ株式会社 | Thermal flow meter |
| DE102017218893A1 (en) * | 2017-10-23 | 2019-04-25 | Robert Bosch Gmbh | Sensor arrangement for determining at least one parameter of a fluid flowing through a measuring channel |
| DE102018219729A1 (en) | 2018-11-16 | 2020-05-20 | Robert Bosch Gmbh | Device for determining at least one parameter of a fluid medium flowing in a flow tube |
-
2021
- 2021-03-30 DE DE102021203214.1A patent/DE102021203214B3/en active Active
-
2022
- 2022-03-17 CN CN202280026251.XA patent/CN117203504A/en active Pending
- 2022-03-17 JP JP2023560752A patent/JP2024513415A/en active Pending
- 2022-03-17 WO PCT/EP2022/056957 patent/WO2022207334A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021203214B3 (en) | 2022-04-28 |
| JP2024513415A (en) | 2024-03-25 |
| WO2022207334A1 (en) | 2022-10-06 |
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