Search

CN-121994305-A - Intelligent TMAP sensor

CN121994305ACN 121994305 ACN121994305 ACN 121994305ACN-121994305-A

Abstract

The invention relates to the technical field of sensor structures, in particular to an intelligent TMAP sensor which comprises a main shell, wherein through holes are formed in a circuit board at the position of a pressure sensor, gas generated during welding can be discharged from the through holes, the condition of causing cavities at the welding position is avoided, the welding strength and the electrical performance of the pressure sensor are ensured, a gas discharge monitoring and optimizing module is used for monitoring the welding gas quantity in real time and performing dynamic analysis, accurately predicting the gas discharge requirement, based on a gas state equation and an oxygen correction model, comparing real-time data with a gas discharge threshold value, automatically judging whether the solder paste dosage is safe or not, giving an alarm and limiting technological parameters once exceeding the standard, preventing the welding cavities from the source, realizing double-channel signal synchronous acquisition and intelligent diagnosis through a signal diagnosis and response module by means of a double-wire bonding structure, and identifying signal abnormality and judging faults in a grading manner through noise filtering, deviation analysis and trend judgment.

Inventors

  • WANG ZUMIN
  • ZHOU HAIHUI
  • XIA CHENGJUN
  • Bi Jinhang
  • Mao Mengwei
  • ZHANG WEI

Assignees

  • 龙微科技(无锡)股份有限公司

Dates

Publication Date
20260508
Application Date
20260303

Claims (9)

  1. 1. The intelligent TMAP sensor comprises a main shell (1), and is characterized in that a circuit board (2) is installed in the main shell (1), a pressure sensor (4) is installed at the bottom of the circuit board (2), a guide hole (16) is formed in the position, close to the pressure sensor (4), of the main shell (1), a through hole (24) is formed in the circuit board (2) corresponding to the middle position of the pressure sensor (4), and a plurality of positioning holes (22) are formed in the position, close to the outer side, of the circuit board (2); A signal diagnosis and response module is arranged on the circuit board (2); The signal diagnosis and response module synchronously collects two-channel pressure signals with high sampling frequency, eliminates hardware delay and noise through time stamp calibration and moving average filtering, calculates characteristics of two-channel signal deviation, trend consistency and the like, sets different fluctuation thresholds according to the working state of the sensor, continuously monitors the signal deviation, window mean deviation and trend consistency, realizes intelligent judgment of mild, moderate and severe faults, sends different early warning frames to an engine control system through a plug-in end according to fault level, and triggers grading response strategies from recording faults only, limiting engine power to switching emergency modes and the like.
  2. 2. The intelligent TMAP sensor of claim 1, wherein the data analysis of the signal diagnosis and response module comprises the steps of: U1 in sampling period Recording the time stamp of the two-channel signals And Calculating a time difference If (1) Discarding the signal with larger delay to ensure signal synchronization, and continuously selecting the channel for each channel The moving average filtering is performed at each sampling point, And , If the difference value between a certain data point and adjacent data exceeds three times of the standard deviation of the historical data of the channel, judging the data to be an abnormal value, and replacing the abnormal value by using the intermediate value of the adjacent data; u2, calculating the instantaneous deviation of the two-channel signal And by Calculating sliding window deviation mean value for window by using sampling points Simultaneously, calculating the change trend of the two-channel signals And (3) with And judge its consistency Judging whether the sensor is in a static or dynamic working state according to the signal fluctuation range of the continuous sampling points, and setting a corresponding signal fluctuation threshold value Or (b) And classifying faults based on the deviation value, the window mean deviation and the trend consistency by combining the continuous occurrence times.
  3. 3. The intelligent TMAP sensor according to claim 1, wherein the top of the main housing (1) is provided with an opening, a cover plate (13) is arranged at the opening, and mutually staggered plug-in ends (11) and fixing lugs (15) are fixed on the outer side of the main housing (1).
  4. 4. The intelligent TMAP sensor according to claim 1, characterized in that the conductive sheet (14) is fixed in the main housing (1) at the position of the plugging end (11), the circuit board (2) is provided with a connecting hole (23) corresponding to the conductive sheet (14), and the circuit board (2) at the position of the connecting hole (23) is connected with the conductive sheet (14) by welding.
  5. 5. The intelligent TMAP sensor according to claim 4, wherein the air inlet duct (12) is fixed at the bottom of the main casing (1), the guide hole (16) is arranged corresponding to the air inlet duct (12), the ASIC chip (21) is arranged at the staggered position of the top of the circuit board (2) and the pressure sensor (4), the temperature sensor (3) is arranged in the air inlet duct (12), the conductive copper sheet (17) is fixed at the staggered position of the main casing (1) and the guide hole (16), the conductive copper sheet (17) is electrically connected with the plugging end (11), and the pin of the temperature sensor (3) is fixed with the conductive copper sheet (17) at the corresponding position.
  6. 6. The intelligent TMAP sensor according to claim 1, wherein a plurality of welding spots (25) are installed on a circuit board (2) above the pressure sensor (4), a welding ring (26) is installed on the circuit board (2) outside the plurality of welding spots (25), an output contact of the pressure sensor (4) is fixed with the welding spots (25) through soldering, the pressure sensor (4) outside the output contact is fixed with the welding ring (26) through soldering, and a sealing rubber ring (27) is installed between the pressure sensor (4) outside the welding ring (26) and the circuit board (2).
  7. 7. The intelligent TMAP sensor of claim 6, wherein the pressure sensor (4) is connected to the wafer and the circuit board using a double wire bonding structure.
  8. 8. An intelligent TMAP sensor according to claim 5, wherein a protective shell (18) made of a high polymer flexible material is sleeved on a pin of the temperature sensor (3) connected with the conductive copper sheet (17).
  9. 9. An intelligent TMAP sensor according to claim 8, wherein the conductive copper sheet (17) is coated with a glue sealing layer (19) covering the pins of the temperature sensor (3).

Description

Intelligent TMAP sensor Technical Field The invention relates to the technical field of sensor structures, in particular to an intelligent TMAP sensor. Background The TMAP sensor is usually arranged on an air inlet manifold of the automobile and is used for detecting the vacuum degree and the air inlet temperature of the air inlet manifold and converting information into electric signals to be transmitted to an engine control system so as to assist the engine control system to optimize fuel injection and ignition timing; In the actual patch processing process of the pressure sensor in the TMAP sensor, bubbles generated at high temperature cannot be discharged in time due to the decomposition of soldering flux in solder paste, so that welding cavities are formed, the electrical performance and welding strength of the pressure sensor are affected, in the severe environment of actual driving, the internal connection is broken due to unreasonable design of a temperature sensor connection structure, so that detection faults are caused, and meanwhile, the connection parts are broken easily due to the single wire bonding structure commonly adopted by the conventional pressure sensor and the lack of a protection structure between pins of the temperature sensor and a circuit board, so that communication faults of the sensor are caused. Disclosure of Invention The invention adopts the following technical scheme for realizing the purposes: The intelligent TMAP sensor comprises a main shell, wherein a circuit board is arranged in the main shell, a pressure sensor is arranged at the bottom of the circuit board, a guide hole is formed in the main shell, close to the pressure sensor, a through hole is formed in the circuit board, corresponding to the middle position of the pressure sensor, and a plurality of positioning holes are formed in the circuit board, close to the outer side; The circuit board is provided with a signal diagnosis and response module; The signal diagnosis and response module synchronously collects two-channel pressure signals with high sampling frequency, eliminates hardware delay and noise through time stamp calibration and moving average filtering, calculates characteristics of two-channel signal deviation, trend consistency and the like, sets different fluctuation thresholds according to the working state of the sensor, continuously monitors the signal deviation, window mean deviation and trend consistency, realizes intelligent judgment of mild, moderate and severe faults, sends different early warning frames to an engine control system through a plug-in end according to fault level, and triggers grading response strategies from recording faults only, limiting engine power to switching emergency modes and the like. Further, the data analysis steps of the signal diagnosis and response module are as follows: U1 in sampling period Recording the time stamp of the two-channel signalsAndCalculating a time differenceIf (1)Discarding the signal with larger delay to ensure signal synchronization, and continuously selecting the channel for each channelThe moving average filtering is performed at each sampling point,And,If the difference value between a certain data point and adjacent data exceeds three times of the standard deviation of the historical data of the channel, judging the data to be an abnormal value, and replacing the abnormal value by using the intermediate value of the adjacent data; u2, calculating the instantaneous deviation of the two-channel signal And byCalculating sliding window deviation mean value for window by using sampling pointsSimultaneously, calculating the change trend of the two-channel signalsAnd (3) withAnd judge its consistencyJudging whether the sensor is in a static or dynamic working state according to the signal fluctuation range of the continuous sampling points, and setting a corresponding signal fluctuation threshold valueOr (b)And classifying faults based on the deviation value, the window mean deviation and the trend consistency by combining the continuous occurrence times. Further, the top of the main shell is provided with an opening, a cover plate is arranged at the opening, and mutually staggered inserting ends and fixing lugs are fixed on the outer side of the main shell. The plug-in end is used for connecting a sensor cable, and the fixed lug is used for using and installing the sensor. According to the different types of the sensor connectors, the conducting strips are correspondingly arranged. Further, a conductive sheet is fixed in the main shell at the plug-in end position, a connecting hole is formed in the circuit board corresponding to the conductive sheet, and the circuit board at the connecting hole position is connected with the conductive sheet in a welding mode. Further, the bottom of the main shell is fixedly provided with an air inlet duct, the guide hole is arranged corresponding to the position of the air inlet duct, the top of the circuit boa