CN110553783A - Pressure sensor for vehicle and pressure measuring method - Google Patents
Pressure sensor for vehicle and pressure measuring method Download PDFInfo
- Publication number
- CN110553783A CN110553783A CN201810556665.9A CN201810556665A CN110553783A CN 110553783 A CN110553783 A CN 110553783A CN 201810556665 A CN201810556665 A CN 201810556665A CN 110553783 A CN110553783 A CN 110553783A
- Authority
- CN
- China
- Prior art keywords
- pressure
- sensing element
- chamber
- signal processing
- gas
- Prior art date
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 69
- 239000002245 particle Substances 0.000 claims abstract description 50
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000010931 gold Substances 0.000 claims description 12
- 229910052737 gold Inorganic materials 0.000 claims description 12
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 238000009530 blood pressure measurement Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims 1
- 238000007747 plating Methods 0.000 claims 1
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 9
- 239000003292 glue Substances 0.000 description 8
- 239000000499 gel Substances 0.000 description 6
- 238000005476 soldering Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ROXBGBWUWZTYLZ-UHFFFAOYSA-N [6-[[10-formyl-5,14-dihydroxy-13-methyl-17-(5-oxo-2h-furan-3-yl)-2,3,4,6,7,8,9,11,12,15,16,17-dodecahydro-1h-cyclopenta[a]phenanthren-3-yl]oxy]-4-methoxy-2-methyloxan-3-yl] 4-[2-(4-azido-3-iodophenyl)ethylamino]-4-oxobutanoate Chemical compound O1C(C)C(OC(=O)CCC(=O)NCCC=2C=C(I)C(N=[N+]=[N-])=CC=2)C(OC)CC1OC(CC1(O)CCC2C3(O)CC4)CCC1(C=O)C2CCC3(C)C4C1=CC(=O)OC1 ROXBGBWUWZTYLZ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical class [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011990 functional testing Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- -1 polybutylene terephthalate Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/06—Devices or apparatus for measuring differences of two or more fluid pressure values using electric or magnetic pressure-sensitive elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a pressure sensor for a vehicle and a pressure measuring method, which are low in measuring cost and high in measuring precision. The pressure sensor comprises a shell, a base, a first sensing element, a second sensing element and a pressure signal processing device, wherein the base, the first sensing element, the second sensing element and the pressure signal processing device are arranged in the shell, the first sensing element, the second sensing element and the pressure signal processing device are arranged on the base, the pressure signal processing device is respectively connected with the first sensing element and the second sensing element, and the pressure measuring method comprises the following steps: sensing the pressure difference of gas between the upstream and downstream of the engine particle catcher through a first sensing element, and feeding back the pressure difference information of the gas to a pressure signal processing device; sensing the absolute pressure of the gas at the downstream of the engine particle catcher through a second sensing element, and feeding back the absolute pressure information to a pressure signal processing device; the pressure signal processing device processes the received pressure difference information and absolute pressure information of the gas, so that the pressure difference information and the absolute pressure information can be output through one path of signal.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a pressure sensor and a pressure measuring method.
Background
With the increasing number of automobiles in China, the problem of environmental pollution caused by exhaust gas is becoming more serious, so the national standards for automobile exhaust emission are also continuously updated and become stricter. "GuoLiu" is now officially released and will be fully implemented since 2020. In order to meet the limit requirements of new emission regulations on PM (particulate matter emission), a Gasoline engine particle trap (GPF) is additionally arranged on an exhaust pipe of a Gasoline engine.
Although GPF can effectively trap particulate matter in the exhaust of an automobile, the exhaust pressure increases with the increase of trapped particulate matter, which affects the dynamic and economical efficiency of the engine. Therefore, when the particulates in the GPF accumulate to some extent, it is necessary to increase the engine exhaust temperature to oxidatively combust the particulates in the GPF, i.e., to regenerate the GPF. Further, to trigger regeneration of the GPF and meet on-board diagnostic system (OBD) requirements, the pressure differential upstream and downstream of the GPF needs to be accurately measured. In addition, to monitor GPF connecting line status and meet OBD diagnostic requirements, it is also necessary to measure absolute pressure downstream of the GPF.
In order to meet the measurement requirements, one of the currently known solutions is to use two pressure sensors, one of which measures the pressure difference upstream and downstream of the GPF, and the other of which measures the absolute pressure downstream of the GPF, but the solution has the disadvantages that two sets of pressure sensors and a plurality of connecting pipelines are required, and two ECU interfaces are also required, which significantly increases the system cost. In another scheme, two pressure sensing modules are used in the same pressure sensor to respectively measure the absolute pressure at the upstream and the downstream of the GPF, and two paths of absolute pressure signals are fed back to the ECU. Obviously, in the second solution, an additional operation is required by the ECU to obtain the desired pressure difference upstream and downstream of the GPF, and the error of the operation is the accumulation of the errors measured by the two pressure sensing modules individually, so the accuracy of the pressure difference is low, and the OBD diagnosis requirement cannot be met.
disclosure of Invention
in view of the above, the present invention provides a pressure sensor and a pressure measuring method for a vehicle, which can directly measure the pressure difference between the upstream and downstream of an engine particle trap without calculation, and without configuring too many connecting pipes, and only occupy one ECU interface, so that the system cost is low and the measurement accuracy is high.
according to an aspect of the present invention, there is provided a pressure sensor for a vehicle, including a housing, and a base, a first sensing element, a second sensing element, and a pressure signal processing device provided in the housing, the first sensing element, the second sensing element, and the pressure signal processing device being provided on the base, the pressure signal processing device being connected to the first sensing element and the second sensing element, respectively;
The first sensing element is used for sensing the pressure difference of gas between the upstream and the downstream of the engine particle catcher and feeding back the information of the pressure difference of the gas to the pressure signal processing device; the second sensing element is used for sensing the absolute pressure of the gas at the position downstream of the engine particle catcher and feeding back the absolute pressure information to the pressure signal processing device; the pressure signal processing device is used for processing the received pressure difference information and the absolute pressure information of the gas, so that the pressure difference information and the absolute pressure information can be output through one path of signal.
Further, a first chamber and a second chamber which are separated from each other are arranged in the shell, and a third chamber communicated with the second chamber is also arranged in the shell; the first sensing element and the second sensing element each have two opposing surfaces;
Wherein one surface of the first sensing element is within the first chamber and the other surface is within the third chamber; one surface of the second sensing element is in the second chamber, and the other surface is in a vacuum environment.
furthermore, a fourth cavity which is isolated from other cavities is arranged in the shell, and the pressure signal processing device is arranged in the fourth cavity.
further, the first chamber and the third chamber are arranged oppositely and arranged at the same side of the base with the second chamber, and the third chamber and the fourth chamber are arranged at the other side of the base.
further, a first pipeline and a second pipeline are arranged on one side of the shell, the first pipeline is used for introducing gas at the position upstream of the engine particle catcher, and the second pipeline is used for introducing gas at the position downstream of the engine particle catcher.
further, the casing has relative first side and the second side that sets up, first side is equipped with the mounting flange that is used for being fixed in pressure sensor on the vehicle, the second side is equipped with the connection port that is used for being connected with external mechanism.
further, the first side and the second side are disposed on the bottom of the housing, and a positioning rod for positioning the pressure sensor on the vehicle is disposed on the bottom.
Furthermore, the shell comprises a body and a cover plate arranged at the opening of the body.
Further, the base with the body and the apron passes through silica gel sealing connection.
Further, the pressure signal processing device comprises a circuit board and a digital application specific integrated circuit arranged on the circuit board;
The digital application specific integrated circuit is used for carrying out nonlinear and temperature drift compensation processing on the pressure difference information input by the first sensing element and the absolute pressure information input by the second sensing element at the same time, and coding the processed pressure difference information and absolute pressure information, so that the pressure difference information and the absolute pressure information realize one-path signal output by a single-side nibble digital communication protocol.
Further, the first sensing element and the second sensing element each comprise a strain gauge and a wheatstone bridge arranged on the strain gauge; the first sensing element and the second sensing element are respectively connected with four contact pins through gold binding lines, and the four contact pins are connected with the pressure signal processing device.
furthermore, a protective gel is arranged on the gold binding wire, and the protective gel is a fluorine-containing gel.
further, the first sensing element and the second sensing element are both MEMS sensing elements.
Furthermore, the pressure signal processing device is connected with the outside through three contact pins, wherein one contact pin is used for transmitting the signal.
Further, the surface of the contact pin is plated with gold.
Furthermore, the base is made of an epoxy resin modified material.
According to another aspect of the present invention, there is provided a pressure measuring method for a vehicle, including:
Providing a shell, and a base, a first sensing element, a second sensing element and a pressure signal processing device which are arranged in the shell, wherein the first sensing element, the second sensing element and the pressure signal processing device are all arranged on the base, and the pressure signal processing device is respectively connected with the first sensing element and the second sensing element;
The pressure measurement method further includes:
Sensing the pressure difference of the gas between the upstream and the downstream of the engine particle catcher through the first sensing element, and feeding back the information of the pressure difference of the gas to the pressure signal processing device;
sensing an absolute pressure of the gas downstream of the engine particle trap through the second sensing element and feeding back absolute pressure information to the pressure signal processing device; and
The pressure signal processing device processes the received pressure difference information and absolute pressure information of the gas, so that the pressure difference information and the absolute pressure information can be output through one path of signal.
further, the pressure signal processing device comprises a circuit board and a digital application specific integrated circuit arranged on the circuit board, and the operation steps of the pressure signal processing device comprise:
the digital application specific integrated circuit simultaneously carries out nonlinear and temperature drift compensation processing on the pressure difference information input by the first sensing element and the absolute pressure information input by the second sensing element, and carries out coding processing on the processed pressure difference information and absolute pressure information, so that the pressure difference information and the absolute pressure information realize one-way signal output by a single-side nibble digital communication protocol.
Further, a first chamber and a second chamber are provided in the housing, the first chamber and the second chamber being isolated from each other, and a third chamber is provided in communication with the second chamber, wherein the step of sensing the pressure difference of the gas between the upstream and downstream of the engine particle trap by the first sensing element comprises:
The first sensing element senses the pressure of the gas in the first chamber through one surface, senses the pressure of the gas in the third chamber through the other surface of the first sensing element, and obtains the pressure of the gas in the first chamber and the pressure of the gas in the third chamber, wherein the pressure of the gas in the first chamber and the pressure of the gas in the third chamber are the pressures of the gas in the first chamber and the gas in the third chamber;
and the step of the second sensing element sensing the absolute pressure of the gas downstream of the engine particle trap comprises:
the second sensing element senses the pressure of the gas in the second chamber through one surface and senses the vacuum degree of a vacuum environment through the other surface, and obtains the absolute pressure downstream of the engine particle trap according to the pressure of the gas in the second chamber and the vacuum degree.
In summary, in the pressure sensor and the pressure measuring method for a vehicle according to the present invention, only two sensing elements and a small number of connecting pipes are required to measure the upstream and downstream differential pressures and the downstream absolute pressures of the engine particle trap, and the pressure signal processing device can process the information output by the two sensing elements into a signal suitable for one path of electrical output, and the one path of electrical output can be transmitted to the outside (such as a vehicle controller).
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is an exploded schematic view of a pressure sensor in an embodiment of the invention;
FIG. 2 is a schematic diagram of the assembly of a pressure sensor in an embodiment of the invention;
FIG. 3 is a schematic assembly diagram of a pressure measurement cell in an embodiment of the invention;
FIG. 4 is an assembled schematic view of the pressure measurement cell shown in FIG. 3 after being flipped 180;
FIG. 5 is a top view of the body of the housing in an embodiment of the present invention;
FIG. 6 is a longitudinal cross-sectional view of a pressure sensor at a first perspective with a cover plate removed in accordance with an embodiment of the present invention;
FIG. 7 is a longitudinal cross-sectional view of a pressure sensor at a second viewing angle with a cover plate disposed in accordance with an embodiment of the present invention.
in the figure:
1-a shell; 11-a body; 110-a first side; 120-a second side; 130-bottom, 140-third side; 111-mounting flange; 112-a connection port; 113-a first conduit; 114-a second conduit; 115-a first chamber; 116-a second chamber; 117-third chamber; 118-a fourth chamber; 12-a cover plate; 2-a base; 3-a first sensing element; 4-a second sensing element; 5-pressure signal processing means; 51-a circuit board; 52-digital application specific integrated circuit.
Detailed Description
The present invention will be described in more detail with reference to the accompanying drawings, in order to make the objects and features of the present invention more comprehensible, embodiments thereof will be described in detail below, but the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described. As used in this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise.
Fig. 1 is an exploded schematic view of a pressure sensor in an embodiment of the present invention, fig. 2 is an assembled schematic view of the pressure sensor in the embodiment of the present invention, fig. 3 is an assembled schematic view of a pressure measuring unit in the embodiment of the present invention,
fig. 4 is an assembly view of the pressure measuring cell shown in fig. 3 after being turned over by 180 °, and it should be understood that portions not visible in fig. 3 and 4 are illustrated in dotted lines.
As shown in fig. 1 to 4, a pressure sensor includes a housing 1 and a pressure measuring unit enclosed in the housing 1. The pressure measuring unit comprises a base 2, a first sensing element 3, a second sensing element 4 and a pressure signal processing device 5, wherein the first sensing element 3, the second sensing element 4 and the pressure signal processing device 5 are arranged on the base 2, and the pressure signal processing device 5 is connected with the first sensing element 3 and the second sensing element 4 respectively. The pressure measuring method of the pressure sensor comprises the following steps:
The pressure difference of the gas between the upstream and the downstream of a gasoline engine particle trap (GPF) is sensed by a first sensing element 3, and the information of the pressure difference of the gas is fed back to a pressure signal processing device 5;
the absolute pressure of the gas at the downstream of the gasoline engine particle catcher is sensed through the second sensing element 4, and the absolute pressure information of the gas is fed back to the pressure signal processing device 5;
The pressure signal processing device 5 processes the received absolute pressure information and pressure difference information of the gas, so that the two paths of information can be output through one path of signal.
here, the pressure sensor is not limited to be applied to a gasoline engine particle trap, but may be a diesel engine particle trap. For this reason, the pressure sensor of the present invention is mainly used for measuring the pressure difference upstream and downstream of the particle trap on the exhaust pipe of the vehicle engine, on one hand, by acquiring the pressure difference upstream and downstream of the particle trap of the engine, the pressure sensor can be used for controlling the regeneration of the particle trap of the engine, on the other hand, by acquiring the absolute pressure downstream of the particle trap of the engine, the pressure sensor can be used for monitoring the state of the connecting pipe on the particle trap of the engine, so as to meet specific requirements such as on-board diagnostic (OBD).
Obviously, the pressure sensor of the present invention only needs two pressure sensing elements and a small number of connecting pipes to achieve measurement of upstream and downstream differential pressures and downstream absolute pressures of the engine particle trap, and the pressure signal processing device 5 can process two pressure information output by the two sensing elements into one signal that can be output, and further the one signal can be transmitted to the outside, for example, to a vehicle controller (Electronic Control Unit: ECU, Electronic Control Unit), so that the one information only occupies one interface of the outside, and the system cost is low. In addition, the expected pressure difference between the upper part and the lower part of the engine particle catcher can be directly measured through the first sensing element 3, so that extra calculation is not needed through the outside, the measurement error is small, the measurement precision is high, and the regeneration of the engine particle catcher can be controlled more accurately.
In this embodiment, the housing 1 may include a body 11 and a cover 12 disposed at an opening of the body 11. The cover plate 12 and the body 11 together define an installation space to accommodate the pressure measuring unit. In a preferred connection mode, the cover plate 12, the body 11 and the base 2 are connected by glue, so that a good sealing effect is achieved and the assembly is convenient. Further, in consideration of the exhaust gas environment in which the pressure sensor operates, the glue is preferably a high-temperature-resistant material, such as silica gel, and the material of the body 11 is also a high-temperature-resistant material, such as polyphenylene sulfide (PPS) or polybutylene terephthalate (PBT) glass fiber reinforced material.
Further, the body 11 has a first side 110 and a second side 120 opposite to the first side 110, wherein the first side 110 is provided with a mounting flange 111 for fixing the pressure sensor to the vehicle, and the second side 120 is provided with a connection port 112 for electrical output so as to be connected to the outside, such as an ECU. Preferably, the bottom 130 of the body 11 is further provided with a positioning rod S, referring to fig. 6 and 7, and the first side 110 and the second side 120 are disposed on the bottom 130. The positioning rod S and the mounting flange 111 can be used in cooperation, so that the pressure sensor is positioned and fixed on the vehicle.
the body 11 further has a third side 140 adjacent to the first side 110 and the second side 120, the third side 140 is also disposed on the bottom 130, and preferably, the third side 140 is disposed with the first pipe 113 and the second pipe 114. The first conduit 113 is adapted to be connected to a corresponding conduit upstream of the engine particle trap for introducing gas upstream of the engine particle trap into the housing 1. The second conduit 114 is adapted to be connected to a corresponding conduit downstream of the engine particle trap for introducing gas downstream of the engine particle trap into the housing 1. Further, the interior of the housing 1 is provided with various chambers for storing the gas introduced by the aforesaid lines.
fig. 5 is a top view of the body of the housing according to the embodiment of the present invention, and as shown in fig. 5, the body 11 of the housing 1 is provided with a first chamber 115 and a second chamber 116 which are separated from each other, wherein the first chamber 115 is connected to the first pipeline 113 to introduce the gas upstream of the engine particle trap into the first chamber 115, and the second chamber 116 is connected to the second pipeline 114 to introduce the gas downstream of the engine particle trap into the second chamber 116.
Fig. 6 is a longitudinal cross-sectional view of the pressure sensor of the embodiment of the invention at a first viewing angle when the cover plate is removed, as shown in fig. 6, the first sensing element 3 and the second sensing element 4 have opposite front and back surfaces, and the front surface of the first sensing element 3 is disposed in the first chamber 115, so that the pressure P1 of the gas in the first chamber 115 (i.e., the pressure upstream of the engine particle trap) can be sensed, and the front surface of the second sensing element 4 is disposed in the second chamber 116, so that the pressure P2 of the gas in the second chamber 116 (i.e., the pressure downstream of the engine particle trap) can be sensed. Preferably, the first chamber 115 and the second chamber 116 are disposed on the same side of the base 2, so as to simplify the structure and reduce the size.
In a preferred embodiment, a third chamber 117 is further provided in the housing 1, and is in communication with and opposite to the second chamber 116, for example, a passage may be provided between the base 2 and the body 11 to allow communication therebetween. Further, by disposing the back surface of the first sensing element 3 in the third chamber 117, the pressure P2 of the gas in the third chamber 117 can be sensed. In this way, the pressure P1 of the gas in the first chamber 115 is sensed through the front side of the first sensing element 3, and the pressure P2 of the gas in the third chamber 117 is sensed through the back side of the first sensing element 3, so that the pressure difference between the upstream and downstream of the engine particle trap can be obtained. In this embodiment, the third chamber 117 can allow gas to flow into the back surface of the first sensing element 3 through a through hole. Here, through the intercommunication of cavity for two sensing element can perceive the pressure of the gas of engine particle trapper downstream department simultaneously, simple structure, easily measurement can guarantee moreover that the condensation water can flow out smoothly, does not gather in sensor inside.
In addition, in the present embodiment, the first sensing element 3 and the second sensing element 4 are preferably MEMS sensing elements, and more preferably, the second sensing element 4 itself is provided with a vacuum chamber, so that the second sensing element 4 can directly sense the vacuum degree (vacuum pressure) of the vacuum chamber, and thus can directly sense the absolute pressure downstream of the engine particle trap.
Fig. 7 is a longitudinal sectional view of the pressure sensor in the embodiment of the present invention at a second viewing angle when the cover plate is disposed, where the second viewing angle forms an included angle of 90 ° with the first viewing angle, for example, the first viewing angle is a left end viewing angle of the pressure sensor, and the second viewing angle is a front end viewing angle of the pressure sensor. As shown in fig. 7, the housing 1 further has a fourth chamber 118, which is separated from the third chamber 117 on the same side of the base 2. In this embodiment, the third chamber 117 and the fourth chamber 118 can be defined by the body 11 and the cover plate 12 together, and the cover plate 12 separates the third chamber 17 from the fourth chamber 118. Therefore, by installing the pressure signal processing device 5 in the fourth chamber 118, the measured gas and the pressure signal processing device 5 can be isolated from each other, so as to prevent the pressure signal processing device 5 from being corroded by the measured gas and affecting the use of the pressure signal processing device.
in this embodiment, the pressure signal processing apparatus 5 includes a circuit board 51, a digital application specific integrated circuit (AISC)52 disposed on the circuit board 51, and a plurality of passive components, such as resistors and capacitors, disposed on the circuit board 51. The digital asic 52 is configured to perform nonlinear and temperature drift compensation processing on the pressure difference information input by the first sensing element 3 and the absolute pressure information input by the second sensing element 4, and convert the two processed signals into information suitable for being output via one signal.
Referring to fig. 3 and 4, the first sensing element 3 and the second sensing element 4 each include a strain gauge and a wheatstone bridge disposed on the strain gauge. The strain gauge is used for acquiring strain information generated by the action of gas pressure on the strain gauge, the wheatstone bridge is used for converting the strain information into electric signals to be output, the digital application specific integrated circuit 52 performs nonlinear and temperature drift compensation processing on the electric signals output by the two wheatstone bridges, the processed two electric signals are encoded into a single-side half byte (SENT) digital communication protocol, and the two electric signals can be transmitted to the outside through a Pin needle by the protocol, including but not limited to transmission to an ECU. In a preferred embodiment, the digital asic 52 may be an integration of a plurality of existing digital asic devices, and those skilled in the art should know how to implement the digital asic 52 to process two electrical signals into a signal suitable for one electrical output based on the disclosure of the present application.
Further, in order to transmit the electrical signal output from the sensing element to the digital asic 52, a wheatstone bridge is connected to the circuit board 51. In one non-limiting method of operation: any one of the sensing elements is connected to a plurality of pins by a gold Bonding wire (Au Bonding wire), and the plurality of pins are connected to the circuit board 51. In order to avoid corrosion of the gold binding line by the gas to be measured, protective gel is preferably arranged on the gold binding line, the gel is preferably fluorine-containing silica gel, on one hand, the fluorine-containing silica gel is softer and cannot influence normal transmission of pressure, and on the other hand, the fluorine-containing silica gel has better medium resistance and can protect the sensing element to normally and stably work in a tail gas environment.
Further, for any one of the sensing elements, it has four output leads, and each lead is connected with one pin through a gold binding wire, so the pressure signal processing device 5 of the present embodiment needs to be connected with two sensing elements through eight pins. In actual assembly, eight pins are fixed on the base 2, one end of each pin passes through the base 2 and is connected with the lead of the sensing element through a gold binding wire, the other end of each pin also passes through the base 2 and is further inserted into a through hole on the circuit board 51, and the connection mode of the pins and the circuit board 51 can be manual soldering, automatic soldering or laser soldering.
further, as shown in fig. 3 and 4, the base 2 is further provided with another three contact pins, specifically, eight contact pins are formed into one group and arranged on one side of the base 2, another group is formed by three contact pins and arranged on the other side of the base 2, and one end of each of the three contact pins is connected with the circuit board 51, and the connection mode can be manual soldering, automatic soldering or laser soldering. In practice, the three pins are used to form an electrical output port integrally with the connection port 112. Specifically, the connection port 112 includes an envelope and three pins disposed in the envelope, and each pin is further provided with a flat insertion piece, and the flat insertion piece can be connected with the pin by welding. In addition, the contact pin and the flat insertion piece can be made of copper-tin alloy materials, and the surface is preferably plated with gold so as to prevent the corrosion of a measuring medium. In practical application, through a single-side nibble (send) digital communication protocol, two signals can be output to the outside through one of the pins, while the other pin is used for grounding, and the remaining pin is used for supplying power to the circuit board.
Further, it is preferable that the material of the base 2 is selected from epoxy resin modified materials, and may be formed by injection molding. The epoxy resin modified material has low thermal expansion coefficient and good medium resistance, so that the pressure measurement unit can be ensured to stably work for a long time under severe conditions such as engine tail gas and the like, and particularly, the thermal expansion coefficient of the material is closer to that of a silicon-based MEMS sensing element, so that the MEMS sensing element can be ensured to be connected with smaller thermal stress. Therefore, in this embodiment, the first sensing element 3 and the second sensing element 4 are preferably MEMS sensing elements, which have small size and can save space, and the corresponding grooves are preferably formed on the substrate 2 to accommodate the first sensing element 3 and the second sensing element 4, and the sensing elements can be fixed to the substrate 2 by glue, and the grooves can prevent the protective gel from flowing out.
further, the assembly process of the pressure sensor of the present embodiment preferably includes the steps of:
Firstly, dispensing inside the body 11, for example, in a glue tank; the glue is preferably the same as the glue bonded in the pressure measuring unit;
Then, the pressure measuring unit is fitted into the body 11; in order to connect the pressure measuring unit and the shell 1 in a good sealing manner, the periphery of the base 2 is preferably provided with an edge, so that the adhesive strength of glue between the pressure measuring unit and the shell 1 can be enhanced;
Then, the three contact pins and the three flat insertion pieces fixedly arranged on the body 11 can be welded together through resistance welding;
subsequently, dispensing can be continued, and the cover plate 12 is installed;
Then, curing the glue at high temperature to fix the pressure measuring unit with the body 11 and the cover plate 12;
Finally, air tightness and functional tests are carried out.
Thus, by obtaining the pressure sensor of the present embodiment, the following advantages can be obtained:
Firstly, the pressure sensor only needs two sensing elements and a small number of connecting pipelines to realize measurement of upstream and downstream differential pressure and downstream absolute pressure of the engine particle catcher, signals output by the two sensing elements can be processed into a signal suitable for one path of electrical output through a digital application specific integrated circuit, and the one path of electrical output can be transmitted to the outside, so that the one path of electrical only occupies one path of interface of the outside, and the system cost is low;
secondly, the pressure sensor directly measures the pressure difference between the upper part and the lower part of the expected engine particle catcher through the first sensing element, so that extra calculation is not needed to be carried out through the outside, the measurement error is small, the measurement precision is high, and the regeneration of the engine particle catcher can be controlled more accurately;
thirdly, the two sensing elements, the digital special integrated circuit and the like are arranged on the same base by the pressure sensor, so that the calibration and the test at the module level can be realized, and the early development and the test are convenient;
Fourthly, the pressure sensor forms isolated chambers and a pipeline for introducing gas through a shell structure, so that condensed water can smoothly flow out and is not accumulated in the sensor, and the pressure sensor can be stably used for a long time;
fifthly, the assembly process of the pressure sensor is simpler, the production efficiency is improved, and the production cost is lower.
finally, it should be noted that the preferred embodiments of the present invention are not limited to the scope disclosed in the above embodiments, for example, the layout of each chamber in the housing is not limited to any particular, and the two pipes may be provided by themselves or provided from the outside, and the pressure signal processing device 5 may be a conventional control device such as a PLC.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (19)
1. a pressure sensor for a vehicle is characterized by comprising a shell, a base, a first sensing element, a second sensing element and a pressure signal processing device, wherein the base, the first sensing element, the second sensing element and the pressure signal processing device are arranged in the shell, the first sensing element, the second sensing element and the pressure signal processing device are arranged on the base, and the pressure signal processing device is connected with the first sensing element and the second sensing element respectively;
The first sensing element is used for sensing the pressure difference of gas between the upstream and the downstream of the engine particle catcher and feeding back the information of the pressure difference of the gas to the pressure signal processing device; the second sensing element is used for sensing the absolute pressure of the gas at the position downstream of the engine particle catcher and feeding back the absolute pressure information to the pressure signal processing device; the pressure signal processing device is used for processing the received pressure difference information and the absolute pressure information of the gas, so that the pressure difference information and the absolute pressure information can be output through one path of signal.
2. the pressure sensor for a vehicle according to claim 1, wherein a first chamber and a second chamber which are isolated from each other are provided in the housing, and a third chamber which communicates with the second chamber is further provided; the first sensing element and the second sensing element each have two opposing surfaces;
Wherein one surface of the first sensing element is within the first chamber and the other surface is within the third chamber; one surface of the second sensing element is in the second chamber, and the other surface is in a vacuum environment.
3. The pressure sensor for a vehicle according to claim 2, wherein a fourth chamber is provided in the housing, the fourth chamber being isolated from the other chambers, and the pressure signal processing device being provided in the fourth chamber.
4. The pressure sensor for a vehicle according to claim 3, wherein the first chamber is disposed opposite to a third chamber disposed on the same side of the base as the second chamber, and the third chamber and the fourth chamber are disposed on the other side of the base.
5. The pressure sensor for a vehicle of claim 1, wherein a side of the housing is provided with a first conduit for introducing gas upstream of the engine particle trap and a second conduit for introducing gas downstream of the engine particle trap.
6. The pressure sensor for a vehicle of claim 1, wherein said housing has first and second oppositely disposed sides, said first side being provided with a mounting flange for securing the pressure sensor to the vehicle, said second side being provided with a connection port for connection to an external mechanism.
7. The pressure sensor for a vehicle of claim 6, wherein the first side and the second side are disposed above a bottom portion of the housing, and a locating bar is disposed on the bottom portion for locating the pressure sensor above the vehicle.
8. The pressure sensor for a vehicle according to claim 1, wherein the housing includes a body and a cover plate provided at an opening of the body.
9. The pressure sensor for a vehicle according to claim 8, wherein the base is connected with the body and the cover by silicone sealing.
10. the pressure sensor for a vehicle according to claim 1, wherein the pressure signal processing means includes a circuit board and a digital application specific integrated circuit provided on the circuit board;
The digital application specific integrated circuit is used for carrying out nonlinear and temperature drift compensation processing on the pressure difference information input by the first sensing element and the absolute pressure information input by the second sensing element at the same time, and coding the processed pressure difference information and absolute pressure information, so that the pressure difference information and the absolute pressure information realize one-path signal output by a single-side nibble digital communication protocol.
11. the pressure sensor for a vehicle according to claim 1, wherein the first sensing element and the second sensing element each include a strain gauge and a wheatstone bridge provided on the strain gauge; the first sensing element and the second sensing element are respectively connected with four contact pins through gold binding lines, and the four contact pins are connected with the pressure signal processing device.
12. The pressure sensor for a vehicle according to claim 11, wherein a protective gel is provided on the gold binding wire, the protective gel being a fluorine-containing gel.
13. the pressure sensor of claim 11, wherein the first sensing element and the second sensing element are both MEMS sensing elements.
14. The pressure sensor for a vehicle according to claim 1, wherein the pressure signal processing device is connected to the outside through three pins, one of which is used to transmit the one-way signal.
15. The pressure sensor for a vehicle according to claim 11 or 14, wherein the pin surface is provided with gold plating.
16. The pressure sensor for a vehicle according to claim 1, wherein a material of the base is an epoxy modified material.
17. A pressure measurement method for a vehicle, characterized by comprising:
Providing a shell, and a base, a first sensing element, a second sensing element and a pressure signal processing device which are arranged in the shell, wherein the first sensing element, the second sensing element and the pressure signal processing device are all arranged on the base, and the pressure signal processing device is respectively connected with the first sensing element and the second sensing element;
The pressure measurement method further includes:
Sensing the pressure difference of the gas between the upstream and the downstream of the engine particle catcher through the first sensing element, and feeding back the information of the pressure difference of the gas to the pressure signal processing device;
sensing an absolute pressure of the gas downstream of the engine particle trap through the second sensing element and feeding back absolute pressure information to the pressure signal processing device; and
The pressure signal processing device processes the received pressure difference information and absolute pressure information of the gas, so that the pressure difference information and the absolute pressure information can be output through one path of signal.
18. The pressure measuring method for a vehicle according to claim 17, wherein the pressure signal processing device includes a circuit board and a digital application specific integrated circuit provided on the circuit board, and the operating steps thereof include:
The digital application specific integrated circuit simultaneously carries out nonlinear and temperature drift compensation processing on the pressure difference information input by the first sensing element and the absolute pressure information input by the second sensing element, and carries out coding processing on the processed pressure difference information and absolute pressure information, so that the pressure difference information and the absolute pressure information realize one-way signal output by a single-side nibble digital communication protocol.
19. the pressure measurement method for a vehicle of claim 17, wherein a first chamber and a second chamber are provided in the housing, the first chamber and the second chamber being isolated from each other, and a third chamber is provided in communication with the second chamber, wherein the step of sensing the pressure difference of the gas between the upstream and downstream of the engine particle trap by the first sensing element comprises:
The first sensing element senses the pressure of the gas in the first chamber through one surface, senses the pressure of the gas in the third chamber through the other surface of the first sensing element, and obtains the pressure difference between the upstream and the downstream of the engine particle catcher according to the pressure of the gas in the first chamber and the pressure of the gas in the third chamber;
And the step of the second sensing element sensing the absolute pressure of the gas downstream of the engine particle trap comprises:
The second sensing element senses the pressure of the gas in the second chamber through one surface and senses the vacuum degree of a vacuum environment through the other surface, and obtains the absolute pressure downstream of the engine particle trap according to the pressure of the gas in the second chamber and the vacuum degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810556665.9A CN110553783A (en) | 2018-05-31 | 2018-05-31 | Pressure sensor for vehicle and pressure measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810556665.9A CN110553783A (en) | 2018-05-31 | 2018-05-31 | Pressure sensor for vehicle and pressure measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110553783A true CN110553783A (en) | 2019-12-10 |
Family
ID=68734563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810556665.9A Pending CN110553783A (en) | 2018-05-31 | 2018-05-31 | Pressure sensor for vehicle and pressure measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110553783A (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57159519A (en) * | 1981-03-30 | 1982-10-01 | Nippon Soken Inc | Detection of clogging degree of fine particle collecting member |
| DE4227893A1 (en) * | 1991-10-18 | 1993-04-22 | Bosch Gmbh Robert | Differential pressure sensor e.g. for vehicle fuel tank - contains two semiconducting membranes with sensor elements on upper sides in common reference chamber, lower sides exposed to different pressures |
| JP2001021431A (en) * | 1999-05-06 | 2001-01-26 | Denso Corp | Pressure sensor |
| US20020134163A1 (en) * | 2001-03-22 | 2002-09-26 | Kavlico Corporation | Independent-excitation cross-coupled differential-pressure transducer |
| CN2867323Y (en) * | 2006-01-10 | 2007-02-07 | 昆山双桥传感器测控技术有限公司 | Vehicular pressure sensor |
| CN201126390Y (en) * | 2007-12-06 | 2008-10-01 | 联创汽车电子有限公司 | Car engine intake manifold absolute pressure transducer |
| CN102680159A (en) * | 2012-05-24 | 2012-09-19 | 柯远珍 | Sensor |
| CN204783184U (en) * | 2015-06-26 | 2015-11-18 | 江苏海事职业技术学院 | Use car after treatment system of pressure drag sensor |
| KR20150137537A (en) * | 2014-05-30 | 2015-12-09 | 주식회사 이엠티 | Low Power Differential pressure sensor device. |
| US9638559B1 (en) * | 2016-02-10 | 2017-05-02 | Sensata Technologies Inc. | System, devices and methods for measuring differential and absolute pressure utilizing two MEMS sense elements |
| CN206309449U (en) * | 2016-12-22 | 2017-07-07 | 上海汽车集团股份有限公司 | Compact diesel rolling stock exhaust gas processing device |
| CN107076630A (en) * | 2014-09-03 | 2017-08-18 | 韩国株式会社科迈特 | Differential pressure pick-up |
| CN206468411U (en) * | 2016-12-22 | 2017-09-05 | 上海汽车集团股份有限公司 | Low-temperature adaptation diesel engine vehicle tail gas treatment device |
| CN107255543A (en) * | 2017-07-19 | 2017-10-17 | 无锡威孚高科技集团股份有限公司 | Differential pressure pickup and preparation method |
| CN107605574A (en) * | 2017-09-21 | 2018-01-19 | 中国汽车技术研究中心 | The on-line automatic warning system of grain catcher failure and control method |
| CN206905960U (en) * | 2017-05-17 | 2018-01-19 | 四川天利科技有限责任公司 | A kind of more device for pressure measurement of centralization |
| CN207163634U (en) * | 2017-07-12 | 2018-03-30 | 江苏奥力威传感高科股份有限公司 | A kind of differential pressure pickup |
| CN208223708U (en) * | 2018-05-31 | 2018-12-11 | 联合汽车电子有限公司 | Pressure sensor for vehicle |
-
2018
- 2018-05-31 CN CN201810556665.9A patent/CN110553783A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57159519A (en) * | 1981-03-30 | 1982-10-01 | Nippon Soken Inc | Detection of clogging degree of fine particle collecting member |
| DE4227893A1 (en) * | 1991-10-18 | 1993-04-22 | Bosch Gmbh Robert | Differential pressure sensor e.g. for vehicle fuel tank - contains two semiconducting membranes with sensor elements on upper sides in common reference chamber, lower sides exposed to different pressures |
| JP2001021431A (en) * | 1999-05-06 | 2001-01-26 | Denso Corp | Pressure sensor |
| US20020134163A1 (en) * | 2001-03-22 | 2002-09-26 | Kavlico Corporation | Independent-excitation cross-coupled differential-pressure transducer |
| CN2867323Y (en) * | 2006-01-10 | 2007-02-07 | 昆山双桥传感器测控技术有限公司 | Vehicular pressure sensor |
| CN201126390Y (en) * | 2007-12-06 | 2008-10-01 | 联创汽车电子有限公司 | Car engine intake manifold absolute pressure transducer |
| CN102680159A (en) * | 2012-05-24 | 2012-09-19 | 柯远珍 | Sensor |
| KR20150137537A (en) * | 2014-05-30 | 2015-12-09 | 주식회사 이엠티 | Low Power Differential pressure sensor device. |
| CN107076630A (en) * | 2014-09-03 | 2017-08-18 | 韩国株式会社科迈特 | Differential pressure pick-up |
| CN204783184U (en) * | 2015-06-26 | 2015-11-18 | 江苏海事职业技术学院 | Use car after treatment system of pressure drag sensor |
| US9638559B1 (en) * | 2016-02-10 | 2017-05-02 | Sensata Technologies Inc. | System, devices and methods for measuring differential and absolute pressure utilizing two MEMS sense elements |
| CN206309449U (en) * | 2016-12-22 | 2017-07-07 | 上海汽车集团股份有限公司 | Compact diesel rolling stock exhaust gas processing device |
| CN206468411U (en) * | 2016-12-22 | 2017-09-05 | 上海汽车集团股份有限公司 | Low-temperature adaptation diesel engine vehicle tail gas treatment device |
| CN206905960U (en) * | 2017-05-17 | 2018-01-19 | 四川天利科技有限责任公司 | A kind of more device for pressure measurement of centralization |
| CN207163634U (en) * | 2017-07-12 | 2018-03-30 | 江苏奥力威传感高科股份有限公司 | A kind of differential pressure pickup |
| CN107255543A (en) * | 2017-07-19 | 2017-10-17 | 无锡威孚高科技集团股份有限公司 | Differential pressure pickup and preparation method |
| CN107605574A (en) * | 2017-09-21 | 2018-01-19 | 中国汽车技术研究中心 | The on-line automatic warning system of grain catcher failure and control method |
| CN208223708U (en) * | 2018-05-31 | 2018-12-11 | 联合汽车电子有限公司 | Pressure sensor for vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9279709B2 (en) | Sensor device for detecting a flow property of a fluid medium | |
| JP6752730B2 (en) | Systems, devices and methods for measuring differential and absolute pressures using two MEMS sensing elements | |
| US6813953B2 (en) | Pressure sensor with a corrosion-resistant diaphragm | |
| US6810746B2 (en) | Sensor arrangement with pressure detector and sensor circuit | |
| US7516667B2 (en) | Differential pressure sensor having symmetrically-provided sensor chips and pressure introduction passages | |
| US6789418B2 (en) | Flow rate sensor | |
| WO2021027847A1 (en) | Pressure sensor | |
| CN107076632B (en) | For detecting the pressure sensor of the pressure of fluid media (medium) | |
| CN208223708U (en) | Pressure sensor for vehicle | |
| JP2008197001A (en) | Pressure sensor | |
| CN104854437B (en) | Device for sensing pressure and temperature of a medium | |
| CN209400120U (en) | Pressure sensor | |
| US8549914B2 (en) | Sensor structure | |
| CN210625922U (en) | Pressure sensor | |
| CN110553783A (en) | Pressure sensor for vehicle and pressure measuring method | |
| WO2017064958A1 (en) | Physical quantity sensor subassembly and physical quantity measurement device | |
| US7152480B2 (en) | Differential pressure detection type pressure sensor and method for manufacturing the same | |
| JP2009047670A (en) | Pressure sensor | |
| JP2007017223A (en) | Pressure sensor | |
| JP2006194683A (en) | Temperature sensor-integrated pressure sensor device | |
| JP4830669B2 (en) | Sensor device and manufacturing method thereof | |
| CN110553782A (en) | pressure sensing module and manufacturing method thereof | |
| CN110631763A (en) | Primary packaging for pressure sensor module | |
| CN221781731U (en) | Dual-mode differential pressure sensor | |
| CN220187895U (en) | Diaphragm type pressure sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |