CN201060016Y - Thin film type air mass flow sensor - Google Patents
Thin film type air mass flow sensor Download PDFInfo
- Publication number
- CN201060016Y CN201060016Y CNU2007201164165U CN200720116416U CN201060016Y CN 201060016 Y CN201060016 Y CN 201060016Y CN U2007201164165 U CNU2007201164165 U CN U2007201164165U CN 200720116416 U CN200720116416 U CN 200720116416U CN 201060016 Y CN201060016 Y CN 201060016Y
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- air
- flow sensor
- mass flow
- sensor
- type air
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Abstract
The utility model provides a diaphragm-type air-quality flow sensor, which comprises a machine body 1, an air passage 11 that is arranged inside the machine body 1, and an air flow sensor 2 which is arranged inside the air passage 11 and a driving circuit of the air flow sensor 2, wherein, the air flow sensor 2 comprises a bracket 21 and a sensor head 22 that is arranged inside the air passage 11 and is firmly connected with one end of the bracket 21, the sensor head 22 is connected with the driving circuit through an electric signal, and one end of the machine body 1 is provided with a measuring pipe. The utility model has the advantages of high precision of the air-quality flow-rate value, good instant-change reaction property when the air-quality flow rate is suddenly changed, etc.
Description
(1) technical field
The utility model relates to a kind of flow motor sensor, is specifically related to a kind of diaphragm type air mass flow sensor that is applicable to the MAF that the measurement internal combustion engine of motor vehicle enters.
(2) background technology
The air-intake of combustion engine air mass flow is a very important measurement parameter.Can modern electronically controlled fuel injection system correctly be controlled at air-fuel ratio in the desired scope, determined dynamic property, economy and the emission behavior index of engine, and the adjusting of Air Fuel Ratio of Gasoline Engines is to adopt the mode of adjusting the distributive value that is complementary with air inflow.Therefore, the measurement of inlet air flow is the basis of control air-fuel ratio.At present, employed inlet air flow-measuring method can be divided into two big classes in the various dissimilar electronically controlled fuel injection systems: a class is the indirect method of measurement, promptly measure MAP, calculate the intake air mass flow by intake air temperature, atmospheric density and engine speed then, because the method belongs to indirect measurement, its precision is lower; Second class is the direct method of measurement, can be divided into two kinds of volume flow measurement and mass flow measurements.Volume flow measurement has rotating air flowmeter of karman vortex and flange plate type air flowmeter, and mass flow measurement has hot wire air flowmeter and hot film type air flowmeter.Distributive value is that so the measurement result of volumetric flow rate also will multiply by by measuring the atmospheric density that atmospheric pressure and atmospheric temperature calculate, its intake air mass flow measurement precision is also low slightly like this according to the air quality of air inlet decision distributive value.With hot line or hot diaphragm type mass flow meter measurement directly be the intake air mass flow, needn't calculate or revise, measuring accuracy is higher.But the heated filament of hot wire air flowmeter is in use easily contaminated, and influence is conducted heat, and measuring accuracy is reduced.
(3) summary of the invention
It is a kind of simple in structure, easy to use that the purpose of this utility model is to provide, and can improve the sensitivity of air mass flow quantitative determination, the diaphragm type air mass flow sensor of long service life.
The purpose of this utility model is achieved in that it comprises body 1, is arranged on the air duct 11 in the body 1 and is installed in air flow sensor 2 in the air duct 11 and the driving circuit of air flow sensor 2, air flow sensor 2 comprises support 21 and places in the air duct 11 and be fixedly connected on sensor head 22 on support 21 1 ends, sensor head 22 electric signal connect driving circuit, and the end in the body 1 is equipped with gauge line.
The utility model also has some technical characterictics like this:
1, described sensor head 22 comprises resistor and measures amplifying circuit, resistor connects measures amplifying circuit and driving circuit, resistor comprises the heating resistor of heating zone, center and at the temperature detecting resistance of heating zone upstream and downstream, driving circuit comprises control circuit for heater and circuit for signal conditioning, heating resistor connects control circuit for heater, and temperature detecting resistance connects measures amplifying circuit;
2, the end of described sensor head 22 in air duct 11 is provided with draft tube;
3, the inlet end of described gauge line is provided with mobile rectifier 32 of plastic grid and wire gauze 31.
For the measurement gas flow, the utility model sensor head is provided with heating resistor and temperature detecting resistance.Temperature detecting resistance mainly is to use as resistance thermometer.For the measurement gas mass rate, on airflow direction, set gradually temperature detecting resistance and heating resistor.The temperature variation of gas under the effect of heating resistor depends on its flow quality flow.In the heating power scope of heating resistor, can determine the mass rate of gas according to the difference of the measured temperature value of temperature detecting resistance.The voltage of heating resistor is supplied with and the temperature element measurement data obtains to realize by means of the driving circuit of sensor.
Sensor head mainly is to be made of silica-based flaggy, silicon dioxide insulating layer and the metal platinum film resistance layer that is processed into palisade in the utility model.Owing to adopted such structure, strengthened the degree of accuracy of the air mass flow numerical quantity that air mass flow sensor records, improved the transient response characteristic under the MAF sudden change, reduced the loss of heat in the process of transmitting.
Driving circuit section is made up of heating control circuit and circuit for signal conditioning, heater circuit is realized constant temperature by the temperature of measures ambient temperature control heating resistor, can realize amplification, the adjustment of zero migration and the compensation of temperature drift by circuit for signal conditioning to the sensor differential signal.
The beneficial effects of the utility model are: replaced original hot-wire airflow sensor, therefore further strengthened the measuring accuracy of air flow sensor.Improved the transition individual features under MAF sudden change, and sensing metal film device head is that flat vertical plane contacts with air, area is little, make sensor probe keep clean and the life-span long.Inlet end at gauge line has installed mobile rectifier of plastic grid and wire gauze additional, flow sensor can be measured the air-flow that has the globule, and air inlet is played about purification.Make to disturb and drop to minimum.The hotting mask of the utility model diaphragm type air flowmeter in use is difficult for contaminated, can keep higher measuring accuracy.
(4) description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2-Fig. 3 is the utility model STRUCTURE DECOMPOSITION synoptic diagram;
Fig. 4 is the utility model gauge line cut-away view;
Fig. 5 is the utility model wire gauze 31 structural representations;
Fig. 6 is mobile rectifier 32 structural representations of the utility model plastic grid;
Fig. 7 is the utility model circuit block diagram.
(5) embodiment
Below in conjunction with accompanying drawing the utility model is further described:
In conjunction with Fig. 1-Fig. 6, present embodiment comprises body 1, be arranged on the air duct 11 in the body 1, be installed in the air flow sensor 2 in the sky passage 11 and the driving circuit 3 of air flow sensor 2, described air flow sensor 2 comprises support 21 and places in the air duct 11 and be fixedly connected on sensor head 22 on support 21 1 ends, sensor head 22 electric signal connect driving circuit, the end of sensor head 22 in air duct 11 is provided with draft tube, end in the body 1 is equipped with gauge line, the inlet end of gauge line is provided with mobile rectifier 32 of plastic grid and wire gauze 31, and wherein sensor head 22 is the sensing metal film device heads that become palisade to form through Laser Processing on heat-insulating rectangular flat shape substrate 222 by metallic film 221 attached linings.
In conjunction with Fig. 7, sensor head 22 comprises resistor and measures amplifying circuit, resistor connects measures amplifying circuit and driving circuit, resistor comprises the heating resistor of heating zone, center and at the temperature detecting resistance of heating zone upstream and downstream, driving circuit comprises control circuit for heater and circuit for signal conditioning, heating resistor connects control circuit for heater, and temperature detecting resistance connects measures amplifying circuit.When the present embodiment product is in duty, sensing metal film device head 22 is provided with a fixing temperature, when the air duct of air in body 1 passes through sensor head 22, the temperature of sensor head 22 is changed, and the electric current that causes sensor head 22 changes, will export an output voltage that is directly proportional with air mass flow by the driving circuit 3 of air flow sensor 2, realize control the fuel of internal combustion engine ratio.
Present embodiment product driving circuit section is made up of heating control circuit and circuit for signal conditioning, heater circuit is realized constant temperature by the temperature of measures ambient temperature control heating resistor, adopt the signal conditioner of moulding that differential signal is amplified simultaneously, temperature compensation and side-play amount adjustment, make things convenient for calibration process, improved measuring accuracy.
Claims (5)
1. diaphragm type air mass flow sensor, it comprises body (1), be arranged on the air duct (11) in the body (1) and be installed in air flow sensor (2) in the air duct (11) and the driving circuit of air flow sensor (2), it is characterized in that air flow sensor (2) comprises support (21) and places in the air duct (11) and be fixedly connected on sensor head (22) on support (21) one ends, sensor head (22) electric signal connects driving circuit, and the end in the body (1) is equipped with gauge line.
2. diaphragm type air mass flow sensor according to claim 1, it is characterized in that: described sensor head (22) comprises resistor and measures amplifying circuit, resistor connects measures amplifying circuit and driving circuit, resistor comprises the heating resistor of heating zone, center and at the temperature detecting resistance of heating zone upstream and downstream, driving circuit comprises control circuit for heater and circuit for signal conditioning, heating resistor connects control circuit for heater, and temperature detecting resistance connects measures amplifying circuit.
3. according to claim 1 or 2 described diaphragm type air mass flow sensors, it is characterized in that: the end of described sensor head (22) in air duct (11) is provided with draft tube.
4. according to claim 1 or 2 described diaphragm type air mass flow sensors, it is characterized in that: the inlet end of described gauge line is provided with mobile rectifier (32) of plastic grid and wire gauze (31).
5. diaphragm type air mass flow sensor according to claim 3 is characterized in that: the inlet end of described gauge line is provided with mobile rectifier (32) of plastic grid and wire gauze (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201164165U CN201060016Y (en) | 2007-06-15 | 2007-06-15 | Thin film type air mass flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201164165U CN201060016Y (en) | 2007-06-15 | 2007-06-15 | Thin film type air mass flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201060016Y true CN201060016Y (en) | 2008-05-14 |
Family
ID=39408494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201164165U Expired - Fee Related CN201060016Y (en) | 2007-06-15 | 2007-06-15 | Thin film type air mass flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201060016Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151814A (en) * | 2018-01-26 | 2018-06-12 | 瑞安市宏创汽车配件有限公司 | A kind of automobile air-flow sensor |
| CN109029603A (en) * | 2017-06-12 | 2018-12-18 | 经登企业股份有限公司 | Sensor |
-
2007
- 2007-06-15 CN CNU2007201164165U patent/CN201060016Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109029603A (en) * | 2017-06-12 | 2018-12-18 | 经登企业股份有限公司 | Sensor |
| CN108151814A (en) * | 2018-01-26 | 2018-06-12 | 瑞安市宏创汽车配件有限公司 | A kind of automobile air-flow sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080514 Termination date: 20100615 |