Air inlet temperature sensor for automobile engine

Abstract

The invention relates to the field of automobile sensors, in particular to an air inlet temperature sensor for an automobile engine, which comprises a power connection head, a positive pole power connection rod and a negative pole power connection rod are fixedly mounted in the power connection head, a fixing plate is connected onto the power connection head, a temperature measuring mechanism is mounted on the fixing plate, and a plurality of thermistors are mounted on the temperature measuring mechanism. And a circuit connection mechanism is arranged in the fixing plate, and the circuit connection mechanism is used for connecting the positive pole electricity connection rod, the negative pole electricity connection rod and the temperature measurement mechanism together, so that a standby thermistor can be directly connected into a circuit again, and the repair time and cost are saved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of automobile sensors, in particular to an air intake temperature sensor for an automobile engine. BACKGROUND

[0002] The core function of the automobile air intake temperature sensor is to monitor the temperature of the air inhaled by the engine, and convert the temperature signal into an electrical signal to be transmitted to the engine electronic control unit (ECU), to provide a key correction basis for fuel injection and ignition timing, and to ensure that the engine can operate efficiently and stably under different working conditions.

[0003] During the operation of the automobile temperature sensor, the thermistor is connected in series to the circuit by two-phase electricity. As the temperature changes, the resistance of the thermistor will also change. By measuring the current in the circuit, the resistance of the thermistor can be obtained, and the air intake temperature of the automobile can be obtained. The traditional automobile temperature sensor usually has only one thermistor. After a long period of use, the thermistor often appears damaged. At this time, the circuit connected to the thermistor is mostly in an open state. Since the traditional automobile temperature sensor usually has only one thermistor in the circuit, the temperature of the automobile air intake cannot be obtained well, which affects the working state of the automobile engine. At this time, the automobile temperature sensor needs to be replaced. The traditional automobile temperature sensor needs to be replaced as a whole, which wastes repair time and cost. SUMMARY

[0004] The application provides an air intake temperature sensor for an automobile engine, which is provided with multiple thermistors and can connect a single resistor in series to the circuit, thereby reducing repair time and cost.

[0005] The application provides an air intake temperature sensor for an automobile engine, which comprises: The electrical connection head is fixedly provided with a positive electrode connecting rod and a negative electrode connecting rod; The fixed plate is fixedly installed on the electrical connection head; The temperature measuring mechanism is installed on the fixed plate, and multiple thermistors are installed on the temperature measuring mechanism; The circuit communication mechanism is arranged in the fixed plate, and is used for connecting the positive electrode connecting rod, the negative electrode connecting rod and the temperature measuring mechanism together.

[0006] The air contacts with the intake temperature sensor before passing through the air filter to enter the engine, and the voltage across the intake temperature sensor is stabilized at about V by the engine electronic control unit, so that the actual resistance of the thermistor can be obtained by measuring the current in the circuit, and the intake temperature is determined, when the thermistor of the automobile engine is damaged, the standby thermistor can be directly connected to the circuit, thereby saving repair time and cost.

[0007] The temperature measuring mechanism comprises a resistance mounting pipe, which is rotatably connected to a fixed plate, a fan-shaped resistance mounting area is formed in the side surface of the resistance mounting pipe, a U-shaped first resistance wire is mounted in the resistance mounting area, and a first thermistor is connected in series with the first resistance wire.

[0008] When the thermistor is damaged, the intake temperature sensor is removed from the intake branch pipe, the resistance mounting pipe is rotated to connect the different first resistance wires with the circuit communication mechanism, the intake temperature sensor is reinstalled in the intake branch pipe, the new first thermistor is connected, the intake temperature sensor can work normally, the automobile ECU can obtain accurate data to accurately measure the intake temperature, and the automobile engine can work stably.

[0009] In particular, the circuit communication mechanism comprises a first magnetic induction coil, which is fixedly installed in the fixed plate, one end of the first magnetic induction coil is connected with the positive electrode connecting rod, two electrode connecting blocks are fixedly installed at the middle position of the fixed plate, the two electrode connecting blocks are connected with the two ends of one first resistance wire, the other end of the first magnetic induction coil is connected with one of the electrode connecting blocks through a wire, the other electrode connecting block is connected with the negative electrode connecting rod through a wire, a first columnar conductor is arranged at the middle position of the first magnetic induction coil, the first columnar conductor is slidably connected in the fixed plate, a first isolation spring is sleeved on the first columnar conductor, one end of the first isolation spring away from the first magnetic induction coil is connected with the first columnar conductor, and the other end is fixedly connected with the fixed plate, a first wiring board is fixedly installed on the fixed plate corresponding to the first columnar conductor, the first columnar conductor is connected with the positive electrode connecting rod, a first motor is installed on the fixed plate, a first gear is fixedly connected to the output shaft of the first motor, a second gear is engaged with the first gear, the second gear is fixedly connected with the resistance mounting pipe, and the positive and negative electrodes of the first motor are connected with the first wiring board and the negative electrode connecting rod, respectively.

[0010] If the first thermistor fails, the circuit becomes open. The first magnetic coil will no longer generate a magnetic field. Under the elastic action of the first isolating spring, the first cylindrical conductor will connect to the first terminal block, energizing the first motor. The first motor will drive the first gear, which in turn meshes with the second gear, causing the second gear to rotate. The second gear then drives the resistor mounting tube to rotate until the other first resistor wire reconnects to the two terminal blocks. At this point, the circuit is closed again, and the magnetic field generated by the first magnetic coil attracts the first cylindrical conductor, disconnecting it from the first terminal block. The first motor will then be de-energized. This technical solution automatically connects a spare thermistor to the circuit in case of thermistor failure, eliminating the need for disassembly and significantly extending the lifespan and fault tolerance of the intake air temperature sensor for automotive engines.

[0011] Furthermore, a ventilation slot for ventilation is provided in the middle of the resistor mounting area.

[0012] It should be noted that the above-mentioned mechanism allows air to flow more smoothly through the temperature sensor, without obstructing airflow while detecting the intake air temperature.

[0013] The temperature measuring mechanism includes a resistance mounting post with a slot in the middle and multiple sets of U-shaped second resistance wires installed side by side at the slot. A second thermistor is connected in series on the second resistance wire.

[0014] It should be noted that when measuring the intake air temperature using the second thermistor, the air comes into contact with the second thermistor through the slot on the resistor mounting post. When the second thermistor is damaged, it is connected to other second resistor wires through the circuit connection mechanism, and a spare second thermistor is connected in series in the circuit.

[0015] It should be further explained that a power connection port is fixedly installed at one end of the second resistance wire near the positive terminal rod, and the other end of the second resistance wire is connected to the negative terminal rod. A second motor is fixedly connected in the fixed plate, and a power connection screw is fixedly connected to the output end of the second motor. A power connection slider is threaded onto the power connection screw and is slidably mounted in the fixed plate, contacting one of the power connection ports. A second magnetic coil is fixedly installed in the fixed plate, with its two ends connected to the positive terminal rod and the power connection slider, respectively. A second columnar conductor is slidably mounted on the fixed plate at the middle position of the second magnetic coil. A second power connection plate is fixedly installed in the fixed plate corresponding to the second columnar conductor. A second isolation spring is provided between the second columnar conductor and the fixed plate. The second columnar conductor is connected to the positive terminal rod via a wire, and the positive and negative terminals of the second motor are connected to the second power connection plate and the negative terminal rod via wires, respectively.

[0016] When the second thermistor in the circuit is damaged, the second magnetic coil is in an open circuit state. Under the pushing action of the second isolation spring, the second cylindrical conductor will come into contact with the second terminal board. At this time, the second motor will be energized, and the output shaft of the second motor will drive the rotation of the terminal screw. The terminal screw is threadedly connected to the terminal slider, causing the terminal slider to slide to the terminal port connected to the spare second resistor wire. At this time, the new second thermistor will be connected to the circuit, so that the intake air temperature sensor continues to work. Through the above technical solution, when a thermistor is damaged, a spare thermistor can be automatically connected to the circuit, thereby ensuring that the car's ECU always receives an accurate signal.

[0017] Two baffles are fixedly installed in the fixed plate to block the ventilation slots.

[0018] The fixing plate has a threaded hole on each side of the temperature measuring mechanism, and a metal washer is fixedly installed at each end of the threaded hole.

[0019] The first magnetic coil is made of wound copper wire.

[0020] Copper, as a conductor, has extremely high electrical conductivity, which can significantly reduce the DC resistance of the coil, thereby reducing energy loss, and also generating less heat during operation.

[0021] The resistor mounting tube is made of ceramic material.

[0022] Because the intake air temperature sensor is close to the engine, the air temperature here is relatively high. Using ceramic material for the resistor mounting tube can effectively prevent deformation caused by temperature and prevent it from affecting the normal operation of the first thermistor. Beneficial effects

[0023] In this invention, when the thermistor fails, the intake air temperature sensor is removed from the intake manifold, the resistor mounting tube is rotated to connect the different first resistor wires to the circuit connection mechanism, and the intake air temperature sensor is reinstalled into the intake manifold, thereby connecting a new first thermistor. This ensures that the intake air temperature sensor can work normally, enabling the vehicle ECU to obtain accurate data and accurately calculate the intake air temperature, thus ensuring the stable operation of the vehicle engine.

[0024] If the first thermistor fails, the circuit becomes open. The first magnetic coil will no longer generate a magnetic field. Under the elastic action of the first isolating spring, the first cylindrical conductor will connect to the first terminal block, energizing the first motor. The first motor will drive the first gear, which in turn meshes with the second gear, causing the second gear to rotate. The second gear then drives the resistor mounting tube to rotate until the other first resistor wire reconnects to the two terminal blocks. At this point, the circuit is closed again, and the magnetic field generated by the first magnetic coil attracts the first cylindrical conductor, disconnecting it from the first terminal block. The first motor will then be de-energized. This technical solution automatically connects a spare thermistor to the circuit in case of thermistor failure, eliminating the need for disassembly and significantly extending the lifespan and fault tolerance of the intake air temperature sensor for automotive engines.

[0025] This invention provides a ventilation slot in the middle of the resistor mounting area, which allows air to flow more smoothly through the temperature sensor without obstructing airflow while detecting the intake air temperature. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the first technical solution of the present invention; Figure 2 This is a first cross-sectional view of the first technical solution of the present invention; Figure 3 This is a second sectional view of the first technical solution of the present invention; Figure 4 For the present invention Figure 3 A magnified view of the structure at point A in the middle; Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle; Figure 6 This is a schematic diagram of the resistor mounting tube in this invention; Figure 7 This is a schematic diagram of the overall structure of the second technical solution of the present invention; Figure 8This is a first cross-sectional view of the second technical solution of the present invention; Figure 9 This is a second cross-sectional view of the second technical solution of the present invention; Figure 10 For the present invention Figure 9 A magnified schematic diagram of the structure at point C in the middle; Figure 11 This is a schematic diagram of the circuit connection structure in the first technical solution of the present invention; Figure 12 This is a three-dimensional schematic diagram of the resistor mounting tube in this invention; Figure 13 This is a schematic diagram of the circuit connection structure in the second technical solution of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Connector; 11. Positive terminal connecting rod; 12. Negative terminal connecting rod; 2. Fixing plate; 21. Wind baffle; 3. Temperature measuring mechanism; 31. Resistor mounting tube; 311. Resistor mounting area; 312. Ventilation slot; 32. First resistor wire; 33. First thermistor; 34. Resistor mounting post; 35. Second resistor wire; 351. Connector port; 36. Second thermistor; 4. Circuit connection mechanism; 41. First magnetic coil; 411. First cylindrical conductor; 412. First isolation spring; 413. First terminal block; 42. Connector block; 43. First motor; 431. First gear; 432. Second gear; 44. Second motor; 45. Connector screw; 46. Connector slider; 47. Second magnetic coil; 48. Second cylindrical conductor; 481. Second isolation spring; 49. Second terminal block. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0029] like Figures 1 to 13 As shown, the present invention provides an intake air temperature sensor for an automotive engine, comprising: A power connector 1 is provided, in which a positive terminal connecting rod 11 and a negative terminal connecting rod 12 are fixedly installed. Fixing plate 2 is fixedly installed on connector 1; Temperature measuring mechanism 3 is mounted on fixed plate 2, and multiple thermistors are mounted on temperature measuring mechanism 3. The circuit connection mechanism 4 is installed in the fixed plate 2. The circuit connection mechanism 4 is used to connect the positive terminal connecting rod 11, the negative terminal connecting rod 12 and the temperature measuring mechanism 3 together.

[0030] During the operation of an automotive engine intake air temperature sensor, the sensor is typically installed in the intake manifold. A typical intake air temperature sensor uses a two-phase power supply. The thermistor of the intake air temperature sensor is usually inserted into the intake manifold, a location close to the engine. Therefore, the air temperature at this location is not only affected by the environment but also significantly influenced by the heat generated by the engine during operation. Before entering the engine, the air comes into contact with the intake air temperature sensor. By measuring the current in the circuit, the actual resistance of the thermistor can be obtained, thus determining the intake air temperature. When the thermistor in the automotive engine fails, a spare thermistor can be directly reconnected to the circuit via the circuit connection mechanism 4, saving repair time and costs.

[0031] like Figures 1 to 6 As shown, the temperature measuring mechanism 3 includes a resistance mounting tube 31, which is rotatably connected to the fixed plate 2. A fan-shaped resistance mounting area 311 is opened on the side of the resistance mounting tube 31. A U-shaped first resistance wire 32 is installed in the resistance mounting area 311, and a first thermistor 33 is connected in series on the first resistance wire 32.

[0032] When a thermistor fails, the intake air temperature sensor is removed from the intake manifold. The resistor mounting tube 31 is rotated to connect the different first resistor wires 32 to the circuit connection mechanism 4. The intake air temperature sensor is then reinstalled into the intake manifold, thereby connecting a new first thermistor 33. This ensures that the intake air temperature sensor can work normally, enabling the vehicle ECU to obtain accurate data and accurately calculate the intake air temperature, thus ensuring the stable operation of the vehicle engine.

[0033] like Figures 1 to 6 , Figure 11 and Figure 12As shown, the circuit connection mechanism 4 includes a first magnetic induction coil 41, which is fixedly installed in the fixing plate 2. One end of the first magnetic induction coil 41 is connected to the positive terminal connecting rod 11. Two connecting blocks 42 are fixedly installed in the middle of the fixing plate 2. The two connecting blocks 42 are respectively connected to both ends of a first resistive wire 32. The other end of the first magnetic induction coil 41 is connected to one of the connecting blocks 42 through a wire, and the other connecting block 42 is connected to the negative terminal connecting rod 12 through a wire. A first columnar conductor 411 is provided in the middle of the first magnetic induction coil 41. The first columnar conductor 411 is slidably connected in the fixing plate 2. A first isolation spring 412 is provided. One end of the first isolation spring 412 away from the first magnetic coil 41 is connected to the first cylindrical conductor 411, and the other end is fixedly connected to the fixing plate 2. The fixing plate 2 is fixedly installed with a first terminal block 413 corresponding to the first cylindrical conductor 411. The first cylindrical conductor 411 is connected to the positive terminal rod 11. A first motor 43 is installed on the fixing plate 2. The output shaft of the first motor 43 is fixedly connected to a first gear 431. The first gear 431 meshes with a second gear 432. The second gear 432 is fixedly connected to the resistor mounting tube 31. The positive and negative poles of the first motor 43 are connected to the first terminal block 413 and the negative terminal rod 12, respectively.

[0034] It should be noted that during the process of connecting the first thermistor 33 through the circuit connection mechanism 4, the positive terminal rod 11 and the negative terminal rod 12 are respectively connected to the ECU. The current flows from the positive terminal rod 11 to the first magnetic coil 41, then to the terminal block 42 connected to the first magnetic coil 41, then into the first resistive wire 32 and through the first thermistor 33, then to the other terminal block 42, and finally out through the negative terminal rod 12. When the circuit is in a closed state, the first magnetic coil 41 generates magnetism to attract the first cylindrical conductor 411. At this time, the first isolation spring 412 is in a compressed state. During this process, if the first thermistor 33 is damaged, the circuit is in an open state. At this time, the first magnetic coil 41 will no longer generate a magnetic field. Under the elastic action of the first isolation spring 412, the first cylindrical conductor 411 is compressed. 11 will then connect to the first terminal block 413, at which point the first motor 43 will be energized. The first motor 43 will drive the first gear 431 to rotate. The first gear 431 meshes with the second gear 432, causing the second gear 432 to rotate. The second gear 432 drives the resistor mounting tube 31 to rotate until the other first resistor wire 32 is reconnected to the two terminal blocks 42. At this point, the circuit is restored to a closed state. The first magnetic coil 41 generates a magnetic field that attracts the first cylindrical conductor 411 again. At this point, the first cylindrical conductor 411 will disconnect from the first terminal block 413, and the first motor 43 will be de-energized. Through the above technical solution, in the event of a damaged thermistor, a spare thermistor can be automatically connected to the circuit without disassembly. This greatly improves the service life and fault resistance of the intake air temperature sensor for automotive engines.

[0035] like Figure 6 and Figure 12 As shown, a ventilation slot 312 for ventilation is provided in the middle of the resistor mounting area 311.

[0036] It should be noted that the above-mentioned mechanism allows air to flow more smoothly through the temperature sensor, without obstructing airflow while detecting the intake air temperature.

[0037] like Figures 7 to 10 as well as Figure 13 As shown, the temperature measuring mechanism 3 includes a resistance mounting post 34, a slot is provided in the middle of the resistance mounting post 34, and multiple sets of U-shaped second resistance wires 35 are installed side by side at the slot. A second thermistor 36 is connected in series on the second resistance wires 35.

[0038] It should be noted that when measuring the intake air temperature through the second thermistor 36, the air comes into contact with the second thermistor 36 through the slot on the resistor mounting post 34. When the second thermistor 36 is damaged, it is connected to other second resistor wires 35 through the circuit connection mechanism 4, and a spare second thermistor 36 is connected in series to the circuit.

[0039] like Figures 7 to 10 as well as Figure 13 As shown, one end of the second resistance wire 35 near the positive terminal connecting rod 11 is fixedly installed with a power connection port 351, and the other end of the second resistance wire 35 is connected to the negative terminal connecting rod 12. A second motor 44 is fixedly connected in the fixing plate 2, and a power connection screw 45 is fixedly connected to the output end of the second motor 44. A power connection slider 46 is threaded onto the power connection screw 45. The power connection slider 46 is slidably mounted in the fixing plate 2 and contacts one of the power connection ports 351. A second magnetic induction coil 47 is fixedly installed in the fixing plate 2. The two ends of the magnetic coil 47 are connected to the positive terminal rod 11 and the terminal slider 46, respectively. A second columnar conductor 48 is provided in the middle of the second magnetic coil 47 and is slidably mounted on the fixed plate 2. A second terminal plate 49 is fixedly installed in the fixed plate 2 corresponding to the second columnar conductor 48. A second isolation spring 481 is provided between the second columnar conductor 48 and the fixed plate 2. The second columnar conductor 48 is connected to the positive terminal rod 11 through a wire. The positive and negative terminals of the second motor 44 are connected to the second terminal plate 49 and the negative terminal rod 12 through wires, respectively.

[0040] It should be noted that when the second thermistor 36 is working normally, the current flows from the positive terminal connecting rod 11 to the second magnetic coil 47, then sequentially through the connecting slider 46, the connecting port 351, the second resistance wire 35, the second thermistor 36, and finally through the negative terminal connecting rod 12. At this time, the second magnetic coil 47 generates a directional magnetic field that attracts the second cylindrical conductor 48. When the second thermistor 36 in the circuit is damaged, the second magnetic coil 47 is in an open circuit state. Under the pushing action of the second isolation spring 481, the second cylindrical conductor 48 will connect with the second connecting rod 12. When the plate 49 comes into contact, the second motor 44 will be energized. The output shaft of the second motor 44 will drive the rotation of the energizing screw 45. The energizing screw 45 is threadedly connected to the energizing slider 46, causing the energizing slider 46 to slide to the energizing port 351 connected to the spare second resistor wire 35. At this time, the new second thermistor 36 will be connected to the circuit, so that the intake air temperature sensor continues to work. Through the above technical solution, when the thermistor is damaged, the spare thermistor can be automatically connected to the circuit, thereby ensuring that the car's ECU always receives an accurate signal.

[0041] like Figure 6 andFigure 12 As shown, two baffles 21 for blocking the ventilation slots 312 are fixedly installed in the fixed plate 2.

[0042] This technology ensures that air can pass smoothly through the intake temperature sensor while preventing gas from blowing directly onto the backup first thermistor, thereby improving the lifespan and reliability of the backup first thermistor.

[0043] The fixing plate 2 has a threaded hole on each side of the temperature measuring mechanism 3, and a metal washer is fixedly installed at each end of the threaded hole.

[0044] By using bolts to fix the temperature sensor in this way, the torsional force can be increased, improving the tightness of the installation and the airtightness of the connection between the intake air temperature sensor and the intake manifold.

[0045] The first magnetic induction coil 41 is made of copper wire.

[0046] Copper, as a conductor, has extremely high electrical conductivity, which can significantly reduce the DC resistance of the coil, thereby reducing energy loss, and also generating less heat during operation.

[0047] The resistor mounting tube 31 is made of ceramic material.

[0048] Because the intake air temperature sensor is close to the engine, the air temperature here is relatively high. Making the resistor mounting tube 31 with ceramic material can effectively avoid deformation caused by temperature and prevent it from affecting the normal operation of the first thermistor 33.

[0049] Working principle: S1: When the thermistor fails, remove the intake air temperature sensor from the intake manifold, rotate the resistor mounting tube 31 to connect the different first resistor wires 32 to the circuit connection mechanism 4, reinstall the intake air temperature sensor into the intake manifold, and connect the new first thermistor 33 to ensure that the intake air temperature sensor can work normally, so that the car ECU can obtain accurate data to accurately calculate the intake air temperature and ensure the stable operation of the car engine. S2: If the first thermistor 33 is damaged, the circuit is in an open circuit state. At this time, the first magnetic coil 41 will no longer generate a magnetic field. Under the elastic action of the first isolation spring 412, the first cylindrical conductor 411 will be connected to the first terminal block 413. At this time, the first motor 43 will be energized and will drive the rotation of the first gear 431. The meshing of the first gear 431 and the second gear 432 will cause the second gear 432 to rotate. The second gear 432 will drive the rotation of the resistor mounting tube 31 until the other... The first resistor wire 32 is reconnected to the two junction blocks 42, and the circuit is now open again. The first magnetic coil 41 generates a magnetic field that attracts the first cylindrical conductor 411 again, at which point the first cylindrical conductor 411 is disconnected from the first terminal block 413, and the first motor 43 is de-energized. Through the above technical solution, in the event of a damaged thermistor, a spare thermistor can be automatically connected to the circuit without disassembly, which greatly improves the service life and fault resistance of the intake air temperature sensor for automobile engines.

[0050] S3: A ventilation slot 312 is provided in the middle of the resistor mounting area 311 to allow air to flow more smoothly when passing through the temperature sensor, so as not to obstruct the air flow while detecting the intake air temperature.

[0051] S4: When the second thermistor 36 in the circuit is damaged, the second magnetic coil 47 is in an open circuit state. Under the pushing action of the second isolation spring 481, the second cylindrical conductor 48 will come into contact with the second terminal plate 49. At this time, the second motor 44 will be energized, and the output shaft of the second motor 44 will drive the rotation of the terminal screw 45. The terminal screw 45 is threadedly connected to the terminal slider 46, causing the terminal slider 46 to slide to the terminal port 351 connected to the spare second resistor wire 35. At this time, the new second thermistor 36 will be connected to the circuit, so that the intake air temperature sensor continues to work. Through the above technical solution, when the thermistor is damaged, the spare thermistor can be automatically connected to the circuit, thereby ensuring that the car's ECU always receives an accurate signal.

[0052] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An intake air temperature sensor for an automotive engine, characterized in that, include: A connector, wherein a positive terminal rod and a negative terminal rod are fixedly installed in the connector; A fixing plate, which is fixedly installed on the connector; A temperature measuring mechanism is mounted on a fixed plate, and multiple thermistors are installed on the temperature measuring mechanism; A circuit connection mechanism is provided in a fixed plate, which is used to connect the positive terminal rod, the negative terminal rod and the temperature measuring mechanism together.

2. The intake air temperature sensor for an automotive engine according to claim 1, characterized in that, The temperature measuring mechanism includes a resistance mounting tube, which is rotatably connected to the fixed plate. A fan-shaped resistance mounting area is opened on the side of the resistance mounting tube, and a U-shaped first resistance wire is installed in the resistance mounting area. A first thermistor is connected in series on the first resistance wire.

3. The intake air temperature sensor for an automotive engine according to claim 2, characterized in that, The circuit connection mechanism includes a first magnetic induction coil, which is fixedly installed in the fixed plate. One end of the first magnetic induction coil is connected to the positive terminal rod. Two terminal blocks are fixedly installed in the middle of the fixed plate, and the two terminal blocks are respectively connected to the two ends of a first resistance wire. The other end of the first magnetic induction coil is connected to one of the terminal blocks through a wire, and the other terminal block is connected to the negative terminal rod through a wire. A first columnar conductor is provided in the middle of the first magnetic induction coil and is slidably connected in the fixed plate. A first isolation spring is sleeved on the first columnar conductor. One end of the first isolation spring away from the first magnetic induction coil is connected to the first columnar conductor, and the other end is fixedly connected to the fixed plate. A first terminal block is fixedly installed on the fixed plate corresponding to the first columnar conductor. The first columnar conductor is connected to the positive terminal rod. A first motor is installed on the fixed plate. A first gear is fixedly connected to the output shaft of the first motor. The first gear meshes with a second gear, and the second gear is fixedly connected to the resistance mounting tube. The positive and negative terminals of the first motor are respectively connected to the first terminal block and the negative terminal rod.

4. The intake air temperature sensor for an automotive engine according to claim 2, characterized in that, A ventilation slot for ventilation is provided in the middle of the resistor mounting area.

5. The intake air temperature sensor for an automotive engine according to claim 1, characterized in that, The temperature measuring mechanism includes a resistance mounting post with a slot in the middle and multiple sets of U-shaped second resistance wires installed side by side at the slot. A second thermistor is connected in series on the second resistance wire.

6. The intake air temperature sensor for an automotive engine according to claim 5, characterized in that, A power connection port is fixedly installed at one end of the second resistance wire near the positive terminal rod, and the other end of the second resistance wire is connected to the negative terminal rod. A second motor is fixedly connected in the fixed plate, and a power connection screw is fixedly connected to the output end of the second motor. A power connection slider is threaded onto the power connection screw and is slidably mounted in the fixed plate, contacting one of the power connection ports. A second magnetic coil is fixedly installed in the fixed plate, and its two ends are respectively connected to the positive terminal rod and the power connection slider. A second columnar conductor is slidably mounted on the fixed plate at the middle position of the second magnetic coil. A second power connection plate is fixedly installed in the fixed plate corresponding to the second columnar conductor. A second isolation spring is provided between the second columnar conductor and the fixed plate. The second columnar conductor is connected to the positive terminal rod through a wire, and the positive and negative terminals of the second motor are connected to the second power connection plate and the negative terminal rod through wires, respectively.

7. The intake air temperature sensor for an automotive engine according to claim 4, characterized in that, Two baffles for blocking the ventilation slots are fixedly installed in the fixing plate.

8. The intake air temperature sensor for an automotive engine according to claim 1, characterized in that, The fixing plate has a threaded hole on each side of the temperature measuring mechanism, and a metal washer is fixedly installed at each end of the threaded hole.

9. The intake air temperature sensor for an automotive engine according to claim 3, characterized in that, The first magnetic coil is made of wound copper wire.

10. The intake air temperature sensor for an automotive engine according to claim 2, characterized in that, The resistor mounting tube is made of ceramic material.

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