CN210464771U

CN210464771U - Tail gas particle differential pressure sensor

Info

Publication number: CN210464771U
Application number: CN201921494361.0U
Authority: CN
Inventors: 张雪磊; 石铭文
Original assignee: Wuhu Liannuo Electrical Appliances Co ltd
Current assignee: Wuhu Liannuo Electrical Appliances Co ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2020-05-05
Anticipated expiration: 2029-09-10

Abstract

The utility model discloses an exhaust gas granule differential pressure sensor, including sensor housing, back lid, high-pressurepipe, low-pressurepipe, communication connector, PCB board and forced induction module, sensor housing's inside is the cuboid groove, the cuboid inslot is installed back lid support ring cavity wall, back lid support ring cavity wall is closed side, forms the high-pressure groove in the back lid support ring cavity wall, fixed mounting has PCB board support ring cavity wall in the high-pressure groove, form the low-pressure groove in the PCB board support ring cavity wall, PCB board support ring cavity wall's top is fixed with through the erection column installation PCB board, high-pressure inlet has been seted up on the cell wall of high-pressure groove, high-pressure inlet switch-on is connected with high-pressurepipe, the low pressure inlet has been seted up on the cell wall of low-pressure groove, the low pressure inlet switch-on is connected with low-pressurepipe. The utility model discloses can use at acid tail gas environment for a long time, measurement accuracy is high, great reduction the granule emission.

Description

Tail gas particle differential pressure sensor

Technical Field

The utility model relates to an automobile intelligent sensor field especially relates to an exhaust particle differential pressure sensor.

Background

The differential pressure sensor is a sensor designed for realizing the requirement of accurately controlling the regeneration triggering time based on the MEMS technology, the differential pressure sensor can be used for measuring the differential pressure of front and rear channels of the catcher and sending a differential pressure signal to the ECU, the ECU determines the regeneration triggering time and the extra fuel injection amount according to the accumulation degree of particles in the catcher, meanwhile, the ECU can also improve the temperature of tail gas by controlling the opening degrees of an EGR valve and an electronic throttle valve, the current products on the market generally adopt two gauge pressure chips to measure the differential pressure, the precision is low, and the sensor is damaged by long-time work due to corrosive sulfide and nitride in the tail gas.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an exhaust particle differential pressure sensor just in order to solve above-mentioned problem.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

a differential pressure sensor for tail gas particles comprises a sensor shell, a rear cover, a high-pressure air pipe, a low-pressure air pipe, a communication plug, a PCB (printed circuit board) and a pressure sensing module, the sensor shell is internally provided with a cuboid groove, the cuboid groove is internally provided with a back cover supporting ring cavity wall, the cavity wall of the back cover supporting ring is a closed side surface, a high pressure groove is formed in the cavity wall of the back cover supporting ring, the cavity wall of the PCB supporting ring is fixedly arranged in the high pressure groove, a low-pressure groove is formed in the cavity wall of the PCB supporting ring, the PCB is fixedly arranged at the top of the cavity wall of the PCB supporting ring through a mounting column, the wall of the high-pressure groove is provided with a high-pressure inlet hole which is communicated and connected with the high-pressure air pipe, the PCB is characterized in that a low-pressure inlet hole is formed in the wall of the low-pressure groove, the low-pressure inlet hole is connected with the low-pressure air pipe in a communicating mode, and the pressure sensing module is installed on the PCB.

In order to further improve the use performance of the exhaust particle differential pressure sensor, two adjacent outer side walls of the sensor shell are provided with fixed mounting lugs, and the fixed mounting lugs are provided with fixed mounting holes for fixedly mounting the sensor.

In order to further improve the use performance of the tail gas particle differential pressure sensor, the sensor shell is also integrally connected with the communication plug, and a clamping piece is arranged on the outer wall of the communication plug.

In order to further improve the service performance of the exhaust particle differential pressure sensor, a communication jack is arranged on the PCB and is in communication connection with the communication plug connector through a plug pin.

In order to further improve the use performance of the tail gas particle differential pressure sensor, a high-pressure air nozzle is installed at the tail end of the high-pressure air pipe, and a low-pressure air nozzle is installed at the tail end of the low-pressure air pipe.

In order to further improve the use performance of the exhaust particle differential pressure sensor, a sealing gasket is attached to the inner wall of the cavity wall of the PCB supporting ring and used for improving the air tightness of the cavity in the cavity wall of the PCB supporting ring.

The utility model discloses a thereby granule volume leads to its inside to produce pressure differential transmission electronic signal to ECU through monitoring in the trap, then ECU control is spouted and is put the fuel clearance granule and realize regeneration, and granule volume emission reduces 90% to adopt car rule level sensing element to measure pressure differential, and can realize high accuracy, ensure that acid diesel oil tail gas can not destroy the sensor or lead to wrong pressure reading.

Drawings

Fig. 1 is a perspective view of an exhaust gas particle differential pressure sensor according to the present invention;

fig. 2 is a schematic diagram of an internal structure of an exhaust gas particle differential pressure sensor according to the present invention;

fig. 3 is a schematic diagram of a sensor housing of an exhaust gas particle differential pressure sensor according to the present invention.

In the figure: 1. a sensor housing; 2. fixing the mounting lug; 3. a rear cover; 4. a high-pressure air pipe; 5. A high-pressure air tap; 6. a low pressure air tap; 7. a low pressure gas pipe; 8. a fastener; 9. a communication plug; 10. a PCB board; 11. a communication jack; 12. a pressure sensing module; 13. the cavity wall of the back cover support ring; 14. the PCB board supports the cavity wall of the ring; 15. inserting the pin header; 16. a gasket; 17. and (6) mounting the column.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1-3, an exhaust gas particle differential pressure sensor comprises a sensor housing 1, a rear cover 3, a high pressure air pipe 4, a low pressure air pipe 7, a communication plug 9, a PCB 10, and a pressure sensing module 12, wherein the sensor housing 1 is a rectangular groove, a rear cover support ring cavity wall 13 is installed in the rectangular groove, the rear cover support ring cavity wall 13 is a closed side, a high pressure groove is formed in the rear cover support ring cavity wall 13, a PCB support ring cavity wall 14 is fixedly installed in the high pressure groove, a low pressure groove is formed in the PCB 10 support ring cavity wall 14, the PCB 10 is fixedly installed at the top of the PCB 10 support ring cavity wall 14 through a mounting post 17, a high pressure inlet hole is formed on the groove wall of the high pressure groove, the high pressure inlet hole is connected with the high pressure air pipe 4, a low pressure inlet hole is formed on the groove wall of the low pressure groove, the low pressure inlet hole is connected with, the PCB board 10 is mounted with a pressure sensing module 12.

In order to further improve an exhaust gas granule differential pressure sensor's performance, install fixed mounting ear 2 on the two adjacent lateral walls of sensor shell 1, it is used for sensor fixed mounting to have seted up the fixed mounting hole on the fixed mounting ear 2, and sensor shell 1 still an organic whole is connected with communication connector 9, is provided with fastener 8 on the outer wall of communication connector 9, is provided with communication jack 11 on the PCB board 10, communication jack 11 is through pegging graft pin 15 and communication connector 9 communication connection, and high-pressure air cock 5 is installed to high-pressure trachea 4's end, and low-pressure air cock 6 is installed to low-pressure trachea 7's end, pastes on the inner wall of PCB board support ring chamber wall 14 to have sealed 16 of packing to be used for increasing the gas tightness of the cavity in PCB board support ring chamber wall.

In the structure, a pressure sensor is arranged on an automobile, a high-pressure air nozzle and a low-pressure air nozzle of the pressure sensor are respectively communicated with the inlet end and the outlet end of a trap, part of tail gas enters a tail gas differential pressure sensor before entering the trap, larger insufficiently combusted particles in the tail gas are retained in the tail gas after entering the trap, the filtered tail gas is output, and part of the filtered tail gas enters the outlet end of the trap; as the impurities in the trap become more, the inlet and outlet of the tail gas are not smooth any more, and the air pressure at the inlet and outlet ends changes due to the change of the gas inlet and outlet speed; the tail gas pressure sensor monitors the pressure change and outputs a corresponding voltage value, sulfide and nitride with strong corrosivity exist in tail gas, in order to ensure that a chip and a circuit board are easy to corrode when the tail gas pressure is monitored for a long time, and ensure that acid diesel tail gas cannot damage the sensor or cause wrong pressure reading, a PCB and a shell carrier are designed by adopting a ceramic material for rigid bonding, the back of a sensitive element is subjected to a pressure mode, silica gel is used for protection, a medium is effectively isolated, a circuit part PAD adopts a gold deposition process and is bound through a gold thread to be connected, so that the circuit part is isolated from the medium, a differential pressure signal output by a DPS (data processing system) is used, and an ECU (electronic control unit) can accurately control the regeneration. The tail gas treatment system with good performance can reduce the particle emission by 70-90%, CO and HC by 90% and NOx by 40-60%.

The foregoing shows and describes a preferred embodiment of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An exhaust gas particle differential pressure sensor, characterized in that: including sensor housing, back lid, high-pressure air pipe, low-pressure air pipe, communication bayonet joint, PCB board and forced induction module, sensor housing's inside is the cuboid groove, the cuboid inslot is installed back lid support ring cavity wall, back lid support ring cavity wall is closed side, forms the high-pressure groove in the back lid support ring cavity wall, high-pressure inslot fixed mounting has PCB board support ring cavity wall, form the low-pressure groove in the PCB board support ring cavity wall, PCB board support ring cavity wall's top is fixed with through the erection column installation PCB board, the high pressure inlet has been seted up on the cell wall of high-pressure groove, the high pressure inlet switch-on is connected with high-pressure air pipe, the low pressure inlet has been seted up on the cell wall of low-pressure groove, the low pressure inlet switch-on is connected with the low-pressure air pipe, install on the PCB board the forced induction module.

2. The exhaust gas particulate differential pressure sensor of claim 1, wherein: and the two adjacent outer side walls of the sensor shell are provided with fixed mounting lugs, and the fixed mounting lugs are provided with fixed mounting holes for fixedly mounting the sensor.

3. The exhaust gas particulate differential pressure sensor of claim 1, wherein: the sensor shell is further integrally connected with the communication plug connector, and a clamping piece is arranged on the outer wall of the communication plug connector.

4. The exhaust gas particulate differential pressure sensor of claim 1, wherein: the PCB is provided with a communication jack, and the communication jack is in communication connection with the communication plug through a plug pin.

5. The exhaust gas particulate differential pressure sensor of claim 1, wherein: the tail end of the high-pressure air pipe is provided with a high-pressure air nozzle, and the tail end of the low-pressure air pipe is provided with a low-pressure air nozzle.

6. The exhaust gas particulate differential pressure sensor of claim 1, wherein: a sealing gasket is attached to the inner wall of the cavity wall of the PCB supporting ring and used for improving the air tightness of the cavity in the cavity wall of the PCB supporting ring.