CN112781780A - Automobile oil pressure sensor - Google Patents
Automobile oil pressure sensor Download PDFInfo
- Publication number
- CN112781780A CN112781780A CN202011610503.2A CN202011610503A CN112781780A CN 112781780 A CN112781780 A CN 112781780A CN 202011610503 A CN202011610503 A CN 202011610503A CN 112781780 A CN112781780 A CN 112781780A
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- CN
- China
- Prior art keywords
- radio frequency
- pressure sensor
- oil pressure
- antenna
- circuit board
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/06—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of piezo-resistive devices
Abstract
The invention relates to an automobile oil pressure sensor, which comprises a metal base, wherein a circuit board is arranged in a cavity of the metal base, a pressure sensor and a processor are installed on the circuit board, the pressure sensor is used for detecting oil pressure and transmitting a detected oil pressure signal to the processor, the circuit board comprises an antenna matching circuit connected with the processor and an antenna carrier connected with the antenna matching circuit, and the antenna matching circuit is used for ensuring that a radio frequency signal transmitted by the antenna carrier can be normally transmitted; the antenna carrier is used for radiating radio signals to the air. The invention realizes point-to-point connection of the engine oil pressure sensor and the controller by adopting wireless communication.
Description
Technical Field
The invention relates to the technical field of oil pressure detection, in particular to an automobile oil pressure sensor.
Background
The oil pressure sensor of the automobile is a device for measuring the oil pressure of an automobile engine, and the measured data is used for controlling the normal operation of the engine. As shown in fig. 1, the conventional oil pressure sensor is composed of a metal housing 1, a rubber seal 2, a ceramic pressure sensor 3, a calibration chip 4, a flexible circuit board 5 and an electrical connection port 6. The oil pressure passes through metal casing and gets into the pressure-bearing chamber, with 3 contact measurement pressure of ceramic sensor, and the rethread electric connection port 6 is exported to the controller after pressure signal is handled through calibration chip 4, and electric connection port 6 is connected by the pencil to the controller, and the pencil mainly provides the power and transmits the signal to the controller for oil pressure sensor.
The problems existing in the existing scheme are as follows: the transmission loss exists in the wire harness transmission, the wire harness layout is complex, the wire harness is easy to age, be polluted, fall off or break due to factors such as vibration and the like, and the engine fault is caused due to the interruption or disconnection of the signal of the engine oil pressure sensor.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automobile oil pressure sensor, which realizes point-to-point connection of an engine oil pressure sensor and a controller by adopting wireless communication.
The technical scheme adopted by the invention for solving the technical problems is as follows: the automobile oil pressure sensor comprises a metal base, wherein a circuit board is arranged in a cavity of the metal base, a pressure sensor and a processor are installed on the circuit board, the pressure sensor is used for detecting oil pressure and transmitting a detected oil pressure signal to the processor, an antenna matching circuit connected with the processor and an antenna carrier connected with the antenna matching circuit are arranged on the circuit board, and the antenna matching circuit is used for ensuring that a radio frequency signal transmitted by the antenna carrier can be normally transmitted; the antenna carrier is used for radiating radio signals to the air.
The antenna carrier is a metal sheet.
The metal sheet is an L-shaped metal sheet or an F-shaped metal sheet.
The L-shaped metal sheet comprises a long side, an R angle and a short side which are sequentially connected, the long side is used for bearing radio frequency power to radiate in space, and the R angle is used for avoiding forming reflection and forming an electromagnetic wave radiation point at the position; the short edge is welded on the circuit board to form a feed point.
The antenna matching circuit includes: the high-voltage protector is used for preventing damage electric signals from entering the processor chip; the direct current isolator is used for preventing external high-voltage direct current from passing; and the radio frequency antenna matcher is used for optimizing an antenna directional pattern.
The high-voltage protector adopts a voltage stabilizing diode, the negative pole end of the voltage stabilizing diode is connected with the feed point of the antenna carrier through a wire on the circuit board, and the positive pole end of the voltage stabilizing diode is connected with the ground wire of the circuit board.
The direct current isolator adopts an isolation capacitor, one end of the isolation capacitor is connected with the high-voltage protector through a wire on the circuit board, and the other end of the isolation capacitor is connected with the radio-frequency antenna matcher through a wire on the circuit board.
The radio frequency antenna matcher comprises a radio frequency inductor, a first radio frequency capacitor and a second radio frequency capacitor, one end of the radio frequency inductor is connected with the direct current isolator, the other end of the radio frequency inductor is connected with the radio frequency output end of the processor chip through a wire on the circuit board, one end of the first radio frequency capacitor is electrically connected with one end of the radio frequency inductor, and the other end of the first radio frequency capacitor is grounded; one end of the second radio frequency capacitor is electrically connected with the other end of the radio frequency inductor, and the other end of the second radio frequency capacitor is grounded.
The cavity of the metal base forms a concave spherical surface.
The supporting cover is sleeved on the cavity of the metal base and used for supporting the antenna carrier.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: the invention replaces the traditional line signal transmission with wireless signal transmission, solves the loss of the original line transmission, and can improve the signal transmission performance by using the metal shell as a signal reflection surface.
Drawings
FIG. 1 is a schematic diagram of a prior art oil pressure sensor;
FIG. 2 is a schematic diagram of the structure of an oil pressure sensor according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an antenna matching circuit in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a metal base of a concave spherical cavity in an embodiment of the invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention relates to a Bluetooth oil pressure sensor which is composed of a metal base 1, a sealing rubber ring 2, a ceramic pressure sensor 3, a battery 9, a PCB 5, a radio frequency chip 7, an antenna matching circuit 8, an antenna carrier 10 and a plastic cover 11.
The oil pressure passes through the metal base and gets into the pressure-bearing chamber, and the contact with ceramic pressure sensor 3 gathers machine oil pressure, and the pressure signal of gathering transmits antenna matching circuit 8 after 7 processings of radio frequency chip and retransmits to antenna carrier 10, radiates 2.4G frequency electromagnetic wave to the air through antenna carrier 10, and the controller receives this electromagnetic wave and converts the pressure value again.
The antenna carrier 10 of the bluetooth oil pressure sensor can be an L-shaped metal sheet or an F-shaped metal sheet, which is used as the sending end of the bluetooth engine oil pressure sensor, and the antenna carrier in the embodiment adopts the L-shaped metal sheet. And the antenna matching circuit 8 is arranged between the L-shaped metal sheet and the radio-frequency signal output end of the radio-frequency chip 7 and used for ensuring that the radio-frequency signals transmitted by the L-shaped metal sheet can be normally transmitted at the radio-frequency signal output end of the radio-frequency chip. In the embodiment, the plastic cover 11 on the bluetooth oil pressure sensor is used for supporting the bluetooth antenna carrier 10, the metal base 1 is used as a reflecting surface, and meanwhile, the bluetooth oil pressure sensor is enabled to realize a bluetooth communication link in an optimal mode under the condition that the size is not increased through the antenna matching circuit 8, and meanwhile, possible abnormal conditions are well avoided.
As shown in fig. 2, the L-shaped metal sheet 10 serves as an antenna carrier of the bluetooth oil pressure sensor, and mainly functions to transmit 2.4G of radio signals into a space; the antenna is composed of a long side, an R angle and a short side which are composed of three sections, wherein the long side mainly bears radio frequency power and radiates to the space, the R angle avoids forming reflection and forms an electromagnetic wave radiation point, and the short side is welded on a PCB to form a feed point.
As shown in fig. 4, the cavity of the metal base 1 of the present embodiment may also be made into a concave spherical surface, and the concave spherical surface serves as a reflecting surface to enhance the transmission power and increase the transmission distance.
As shown in fig. 3, the antenna matching circuit 8 includes a high voltage protector, a dc isolator, and a radio frequency antenna matcher.
The high-voltage protection protector is realized by adopting a voltage-stabilizing diode D1, one end of the voltage-stabilizing diode D1 is connected with the antenna feed point through a PCB board wire, and the other end of the voltage-stabilizing diode D1 is connected with the ground wire of the PCB board, so that the high-voltage protection protector is used for preventing large voltage or lightning stroke, static electricity and other electrical signals from entering the radio frequency chip to damage the chip. When a damage voltage comes in, the high-voltage protection device is instantaneously conducted to control the voltage within 3.3V, so that the radio frequency chip and peripheral devices electrically connected with the radio frequency chip are protected from being damaged.
The direct current isolator is realized by adopting an isolation capacitor C20, and the isolation capacitor C20 is respectively connected with the voltage-stabilizing diode D1 and the radio frequency antenna matcher through PCB plate lines and is used for preventing high voltage of the metal shell from being introduced into the radio frequency chip or peripheral devices electrically connected with the radio frequency chip through the antenna. One end of the isolation capacitor C20 is connected with the feed point through a PCB board wire, and the other end is electrically connected with the radio frequency antenna matcher, so that 2.4G radio frequency signals are allowed to pass through, and external high-voltage direct current is prevented from passing through.
The radio frequency antenna matcher is connected with a signal output ANT pin of the radio frequency chip through a PCB line and is used for optimizing an antenna directional diagram. The radio frequency antenna matcher comprises a radio frequency inductor L1, a radio frequency capacitor C21 and a radio frequency capacitor C23; one end of the radio frequency inductor L1 is connected with the direct current isolation capacitor C20, and the other end of the radio frequency inductor L1 is connected with a radio frequency chip output end ANT of the radio frequency chip through a PCB line; one end of the radio-frequency capacitor C21 is electrically connected with one end of the radio-frequency inductor L1, and the other end of the radio-frequency capacitor C21 is grounded; one end of the radio frequency capacitor C23 is electrically connected with the other end of the radio frequency inductor L1, and the other end is grounded. The radio frequency inductor L1, the radio frequency capacitor C21 and the radio frequency capacitor C23 are Bluetooth antenna matching circuits and are used for optimizing a directional diagram of the antenna. The PCB line is designed into a 50 ohm impedance line, so that the problem of output signal power reduction caused by impedance mismatching of the radio frequency antenna matcher and an ANT output port of the radio frequency chip is avoided. It should be noted that the present embodiment can also be implemented by using other wireless communication modes, and different wireless communication modes can be implemented by adjusting the radio frequency inductor L1, the radio frequency capacitor C21 and the radio frequency capacitor C23.
The invention replaces the traditional line signal transmission with wireless signal transmission, solves the loss of the original line transmission, and can improve the signal transmission performance by using the metal shell as a signal reflection surface.
Claims (10)
1. An automobile oil pressure sensor comprises a metal base, wherein a circuit board is arranged in a cavity of the metal base, a pressure sensor and a processor are installed on the circuit board, the pressure sensor is used for detecting oil pressure and transmitting a detected oil pressure signal to the processor, and the automobile oil pressure sensor is characterized in that an antenna matching circuit connected with the processor and an antenna carrier connected with the antenna matching circuit are included on the circuit board, and the antenna matching circuit is used for ensuring that a radio frequency signal transmitted by the antenna carrier can be normally transmitted; the antenna carrier is used for radiating radio signals to the air.
2. The automotive oil pressure sensor according to claim 1, characterized in that the antenna carrier is a metal sheet.
3. The automotive oil pressure sensor according to claim 2, characterized in that the metal sheet is an L-shaped metal sheet or an F-shaped metal sheet.
4. The automobile oil pressure sensor according to claim 3, wherein the L-shaped metal sheet comprises a long side, an R angle and a short side which are connected in sequence, the long side is used for bearing the radiation of the radio frequency power to the space, and the R angle is used for avoiding the formation of reflection and the formation of an electromagnetic wave radiation point; the short edge is welded on the circuit board to form a feed point.
5. The automotive oil pressure sensor according to claim 1, characterized in that the antenna matching circuit comprises: the high-voltage protector is used for preventing damage electric signals from entering the processor chip; the direct current isolator is used for preventing external high-voltage direct current from passing; and the radio frequency antenna matcher is used for optimizing an antenna directional pattern.
6. The automobile oil pressure sensor according to claim 5, wherein the high voltage protector is a zener diode, the negative terminal of the zener diode is connected to the feed point of the antenna carrier through a wire on the circuit board, and the positive terminal is connected to the ground of the circuit board.
7. The automobile oil pressure sensor as claimed in claim 5, wherein the dc isolator is an isolation capacitor, one end of the isolation capacitor is connected to the high voltage protector through a wire on the circuit board, and the other end of the isolation capacitor is connected to the rf antenna matcher through a wire on the circuit board.
8. The automobile oil pressure sensor according to claim 5, wherein the radio frequency antenna matcher comprises a radio frequency inductor, a first radio frequency capacitor and a second radio frequency capacitor, one end of the radio frequency inductor is connected with the direct current isolator, the other end of the radio frequency inductor is connected with the radio frequency output end of the processor chip through a wire on the circuit board, one end of the first radio frequency capacitor is electrically connected with one end of the radio frequency inductor, and the other end of the first radio frequency capacitor is grounded; one end of the second radio frequency capacitor is electrically connected with the other end of the radio frequency inductor, and the other end of the second radio frequency capacitor is grounded.
9. The automotive oil pressure sensor according to claim 1, characterized in that the cavity of the metal base forms a concave spherical surface.
10. The vehicle oil pressure sensor according to claim 1, wherein the supporting cover is sleeved on the cavity of the metal base, and the supporting cover is used for supporting the antenna carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011610503.2A CN112781780A (en) | 2020-12-30 | 2020-12-30 | Automobile oil pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011610503.2A CN112781780A (en) | 2020-12-30 | 2020-12-30 | Automobile oil pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112781780A true CN112781780A (en) | 2021-05-11 |
Family
ID=75753894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011610503.2A Pending CN112781780A (en) | 2020-12-30 | 2020-12-30 | Automobile oil pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112781780A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19504577A1 (en) * | 1995-02-11 | 1996-08-14 | Fuba Automotive Gmbh | Flat aerial for GHz frequency range for vehicle mobile radio or quasi-stationary aerial |
| US20030137460A1 (en) * | 2002-01-18 | 2003-07-24 | Darfon Electronics Corp. | Antenna system for a wireless input system |
| KR20070025256A (en) * | 2005-09-01 | 2007-03-08 | 주식회사 팬택 | Internal antenna of mobile communication terminal |
| CN101894458A (en) * | 2010-07-21 | 2010-11-24 | 北京爱德盛业科技有限公司 | Automobile fuel pressure wireless detection device |
| CN102023066A (en) * | 2010-05-31 | 2011-04-20 | 昆山双桥传感器测控技术有限公司 | Universal pressure sensor of automobile |
| CN103094674A (en) * | 2011-11-08 | 2013-05-08 | 联发科技股份有限公司 | Mixed antenna, stamping component, printed circuit board, and method for manufacturing the mixed antenna |
| CN104015576A (en) * | 2014-06-03 | 2014-09-03 | 上海纵目科技有限公司 | Bluetooth tire pressure sender antenna |
| CN208672217U (en) * | 2018-06-25 | 2019-03-29 | 精量电子（深圳）有限公司 | A kind of pressure sensor |
| WO2019071413A1 (en) * | 2017-10-10 | 2019-04-18 | 深圳传音制造有限公司 | Pcb antenna and terminal |
-
2020
- 2020-12-30 CN CN202011610503.2A patent/CN112781780A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19504577A1 (en) * | 1995-02-11 | 1996-08-14 | Fuba Automotive Gmbh | Flat aerial for GHz frequency range for vehicle mobile radio or quasi-stationary aerial |
| US20030137460A1 (en) * | 2002-01-18 | 2003-07-24 | Darfon Electronics Corp. | Antenna system for a wireless input system |
| KR20070025256A (en) * | 2005-09-01 | 2007-03-08 | 주식회사 팬택 | Internal antenna of mobile communication terminal |
| CN102023066A (en) * | 2010-05-31 | 2011-04-20 | 昆山双桥传感器测控技术有限公司 | Universal pressure sensor of automobile |
| CN101894458A (en) * | 2010-07-21 | 2010-11-24 | 北京爱德盛业科技有限公司 | Automobile fuel pressure wireless detection device |
| CN103094674A (en) * | 2011-11-08 | 2013-05-08 | 联发科技股份有限公司 | Mixed antenna, stamping component, printed circuit board, and method for manufacturing the mixed antenna |
| CN104015576A (en) * | 2014-06-03 | 2014-09-03 | 上海纵目科技有限公司 | Bluetooth tire pressure sender antenna |
| WO2019071413A1 (en) * | 2017-10-10 | 2019-04-18 | 深圳传音制造有限公司 | Pcb antenna and terminal |
| CN111201666A (en) * | 2017-10-10 | 2020-05-26 | 深圳传音制造有限公司 | PCB antenna and terminal |
| CN208672217U (en) * | 2018-06-25 | 2019-03-29 | 精量电子（深圳）有限公司 | A kind of pressure sensor |
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Application publication date: 20210511 |
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| WD01 | Invention patent application deemed withdrawn after publication |