Controller of nitrogen-oxygen sensor

Abstract

The invention relates to a controller of a nitrogen-oxygen sensor, and relates to the technical field of automobile exhaust emission control, the controller comprises a bottom plate, and the bottom surface of the bottom plate is fixedly connected with heat dissipation fins arranged at equal intervals. According to the invention, the heat generated by the circuit board can be rapidly conducted to the whole housing through the cooperation of the heat dissipation fins and the heat conduction silica gel pad, and meanwhile, the real-time monitoring of the temperature sensor cooperates with the heat dissipation assembly, thereby reducing the aging of devices caused by high temperature, remarkably improving the power management efficiency in a power management circuit, and improving the reliability of the power management circuit. Then, the dynamic control module can obtain operation parameters of an engine in real time, the working mode of a signal processing circuit and the measurement logic of a sensor are flexibly adjusted according to parameter changes, and the limitation that the control strategy is single is solved; the multi-stage processing structure of the signal processing circuit further guarantees the processing precision of the concentration signal of the oxynitride, and the overall performance of the controller is greatly improved through cooperation of all the modules.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile exhaust emission control, and in particular to a controller of a nitrogen oxygen sensor. BACKGROUND

[0002] With the continuous improvement of global environmental awareness, automobile exhaust emission control has become one of the core topics of the development of the automobile industry, and the accurate monitoring and effective control of the emission concentration of nitrogen oxides, as one of the main pollutants in exhaust gas, is the key to meeting environmental protection regulations. The performance of the controller of the nitrogen oxygen sensor, as the core component for directly monitoring the concentration of nitrogen oxides in exhaust gas, directly determines the accuracy, real-time performance and long-term stability of the monitoring data. During vehicle operation, the controller needs to continuously receive and process weak signals from the sensor, and relies on stable power supply support and reliable working environment to ensure efficient operation under complex engine operating conditions.

[0003] However, the power management circuit of the existing nitrogen oxygen sensor controller has the problem of low efficiency, cannot flexibly adjust the power supply mode according to the actual working state of the sensor, causes serious energy waste, increases the energy consumption burden of the vehicle, and the shell structure of the controller is usually designed in a closed manner, which can provide a certain protection effect, but the heat dissipation performance is poor, it is difficult to dissipate the heat generated by the internal circuit during operation in time, and long-term use can easily cause the internal components to accelerate aging due to high temperature, thereby reducing the service life and reliability of the equipment. At the same time, the existing control mode usually adopts a fixed threshold trigger mode, which can only cope with simple engine operating conditions and cannot dynamically adjust according to the real-time changes of the operating parameters such as the speed, load and water temperature of the automobile engine, so it is difficult to meet the accuracy requirements of nitrogen oxide concentration monitoring under complex operating conditions such as cold start, rapid acceleration and idling of the vehicle, thereby affecting the overall effect of exhaust emission control. SUMMARY

[0004] 1. Technical problems solved The purpose of the present application is to provide a controller of a nitrogen oxygen sensor to solve the problems of serious energy waste, increased energy consumption burden of the vehicle, poor heat dissipation performance, difficulty in dissipating heat generated by the internal circuit during operation in time, and inability to dynamically adjust according to the real-time changes of the operating parameters such as the speed, load and water temperature of the automobile engine.

[0005] The controller of the nitrogen oxygen sensor provided by the application adopts the technical scheme as follows: including a bottom plate, the bottom surface of the bottom plate is fixedly connected with equidistantly arranged heat dissipation fins, the upper side of the bottom plate is fixedly connected with a side plate, the inner side of the side plate is provided with a heat dissipation assembly, the inner side of the side plate is fixedly installed with a temperature sensor, the upper side of the bottom plate is fixedly connected with a silicon carbide plate, the upper side of the silicon carbide plate is placed with a circuit board, the upper side of the circuit board is integrated with a dynamic control module, a signal processing circuit and a power management circuit, the dynamic control module comprises a control unit module, the signal processing circuit is composed of a signal receiving module, an operational amplifier, a filter circuit module and an AD conversion module, the power management circuit is composed of a power management module, an energy storage module, a power consumption control module, a power conversion module and a voltage stabilizing module, the inner side of the side plate is fixedly bonded with a heat-conducting silica gel pad, and the dynamic control module is in communication connection with the signal processing circuit and the engine control unit respectively; By adopting the above technical scheme, the heat dissipation fins at the bottom of the bottom plate and the shell structure formed by the side plate cooperate with the heat dissipation assembly and the heat-conducting silica gel pad, so that the internal heat dissipation is enhanced, the heat dissipation performance of the controller is improved, the power management circuit is integrated with the energy storage module and the power consumption control module, the power supply efficiency is optimized, energy waste is reduced, the equipment endurance is prolonged, then the dynamic control module communicates with the engine control unit, the working mode can be adjusted according to the engine operating parameters, the problem of single control strategy is solved, the multi-stage processing structure of the signal processing circuit can improve the signal stability, and the overall structure is improved through the synergistic effect of various modules, and the defects of the prior art are comprehensively improved.

[0006] Preferably, the heat dissipation assembly comprises two air pipes fixedly connected to the inner side of the side plate, the inner side of each of the two air pipes is fixedly connected with a dust separation plate, the inner side of one of the air pipes is fixedly connected with a support, and the inner side of the support is fixedly installed with two small heat dissipation fans, and the small heat dissipation fans are electrically connected with the temperature sensor. By adopting the above technical scheme, the small heat dissipation fans can accelerate the air flow in the shell, cooperate with the air pipes to form convection heat dissipation, improve the heat dissipation efficiency, and the connection of the temperature sensor and the small heat dissipation fans can automatically start and stop the fans according to the internal temperature, realize intelligent heat dissipation, avoid invalid energy consumption, and the dust separation plate can prevent external dust from entering and affecting the internal components, further alleviate the device aging problem caused by poor shell heat dissipation.

[0007] Preferably, the outer side of the side plate is fixedly connected with a plurality of symmetrically arranged protrusions, the upper side of the side plate is provided with a sealing cover plate, the outer side of the sealing cover plate is fixedly connected with a plurality of buckles, and the buckles and the protrusions are in clamping connection. By adopting the technical scheme, the convex block and the buckle are in clasp cooperation, the shell can be quickly sealed and disassembled, the outside water vapor and dust can be prevented from entering the inside in the sealed state, the circuit elements are protected, the aging caused by environmental factors is reduced, the convenient disassembly and assembly facilitate the later maintenance and repair, and the service life of the equipment is indirectly prolonged.

[0008] Preferably, a first connecting end is fixedly installed on the outer side of the control unit module, a wireless transmission module is integrated on the inner side of the control unit module, the control unit module is electrically connected with the external nitrogen oxygen sensor, the outer side of the first connecting end is fixedly connected to the inner side of the side plate through a bolt, and the first connecting end is electrically connected with the external engine control unit. By adopting the technical scheme, the control unit module is connected with the engine control unit through the first connecting end, can efficiently receive the engine operation parameters, can flexibly transmit and receive data, and a dynamic control module adjusts the control logic based on the parameters, breaks the single control mode of the fixed threshold, and then the wireless transmission module integrated in the control unit module can control the nitrogen oxygen sensor to measure the nitrogen oxide value, so that the accuracy of the vehicle emission test result is ensured.

[0009] Preferably, a second connecting end is fixedly installed on the outer side of the signal receiving module, the outer side of the second connecting end is fixedly connected to the inner side of the side plate through a bolt, and the second connecting end is electrically connected with the external nitrogen oxygen sensor. By adopting the technical scheme, the signal receiving module is stably connected with the external nitrogen oxygen sensor through the second connecting end, so that the nitrogen oxide concentration signal collected by the sensor can be efficiently transmitted to the signal processing circuit, a stable input basis is provided for subsequent signal amplification, filtering and other processing, the loss and interference in the signal transmission process are reduced, and the monitoring accuracy under complex working conditions is indirectly improved.

[0010] Preferably, the output end of the signal receiving module is electrically connected with the input end of the operational amplifier, the output end of the operational amplifier is electrically connected with the input end of the filter circuit module, the output end of the filter circuit module is electrically connected with the input end of the AD conversion module, and the output end of the AD conversion module is electrically connected with the input end of the control unit module. By adopting the technical scheme, the signal receiving module, the operational amplifier, the filter circuit module and the AD conversion module in the signal processing circuit are connected in sequence, a complete signal processing process is formed, the weak signal output by the sensor can be optimized step by step, the influence of interference signals is reduced, the processed signal is more accurately transmitted to the control unit module, reliable data support is provided for the dynamic control strategy, and the complex working condition requirements are met.

[0011] Preferably, the output end of the operational amplifier and the input end of the filter circuit module are electrically connected through a shielded cable. By adopting the above technical solution, the connection of the operational amplifier and the filter circuit module through the shielded cable can effectively block the influence of external electromagnetic interference on the transmission signal, ensure the stability of the amplified signal during transmission to the filter circuit module, reduce signal distortion, improve signal processing accuracy, and provide protection for the stable operation of the controller in a complex electromagnetic environment.

[0012] Preferably, a third connecting end is fixedly installed on the outside of the power management module, the third connecting end is inserted into the inside of the side plate, and the power management module is electrically connected with an external power source through the third connecting end. By adopting the above technical solution, the stable connection of the power management module with the external power source through the third connecting end can ensure efficient input of external power to the power management circuit, provide a stable foundation for subsequent power conversion, voltage stabilization and other processes, reduce energy consumption fluctuations caused by unstable power input, assist in improving the efficiency of the power management circuit, and protect the endurance of the device.

[0013] Preferably, the energy storage module, the power consumption control module and the power conversion module are electrically connected with the power management module, the output end of the energy storage module and the input end of the voltage stabilization module are electrically connected, the output end of the power consumption control module and the input end of the power conversion module are electrically connected, the output end of the power conversion module and the input end of the voltage stabilization module are electrically connected, and the output end of the voltage stabilization module and the input end of the signal receiving module are electrically connected. By adopting the above technical solution, the cooperation between the power management module, the energy storage module, the power consumption control module, the power conversion module and the voltage stabilization module can realize efficient conversion and dynamic management of the power supply. At this time, the power consumption control module can adjust the power supply mode according to the working state to reduce invalid energy consumption, and the energy storage module can provide temporary power supply when the power supply is abnormal, thereby significantly improving the efficiency of power management, prolonging the endurance of the device, and solving the problem of low efficiency of the existing power management circuit.

[0014] Preferably, a plurality of positioning heat-conducting copper columns are fixedly connected to the upper side of the silicon carbide plate, a plurality of perforations matched with the positioning heat-conducting copper columns are formed in the outer side of the circuit board, and the outer side of the positioning heat-conducting copper column is inserted into the inner side of the perforation. By adopting the above technical solution, the insulation characteristics of the silicon carbide plate can avoid circuit interference between the circuit board and the bottom plate, ensuring the safety of the circuit. At the same time, the positioning heat-conducting copper column can not only accurately fix the circuit board to prevent displacement, but also conduct the heat generated by the circuit board during operation to the bottom plate, which is dissipated through the heat dissipation structure of the bottom plate, thereby enhancing the overall heat dissipation capacity, reducing the aging of devices caused by local overheating, and improving the reliability of the device.

[0015] 2. Beneficial effects In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application provides a controller for a nitrogen oxide sensor, which can increase the contact area with the external environment by setting the structure design of the heat dissipation fins, cooperate with the heat-conducting silica gel pad to quickly conduct the heat generated by the circuit board to the whole shell, strengthen the heat dissipation path, and the real-time monitoring of the temperature sensor cooperates with the heat dissipation component to effectively alleviate the problem of poor heat dissipation of the controller, reduce the device aging caused by high temperature, and then the power management circuit in the power management circuit can monitor the working state of the circuit in real time, dynamically adjust the power output through the power conversion module and the voltage stabilizing module, combine the energy storage of the energy storage module, significantly improve the power management efficiency, reduce the invalid energy consumption, prolong the endurance of the equipment without external power supply, then the dynamic control module and the engine control unit establish communication, can real-time access to the operating parameters of the engine, flexibly adjust the working mode of the signal processing circuit and the measurement logic of the sensor according to the parameter change, solve the limitation of single control strategy, at the same time, the multi-stage processing structure of the signal processing circuit further guarantees the processing precision of the nitrogen oxide concentration signal, and the cooperation between the modules greatly improves the overall performance of the controller.

[0016] 2. The present application provides a controller for a nitrogen oxide sensor, which can accelerate the air flow inside the shell by setting a small heat dissipation fan, cooperate with the air pipe to form a convection heat dissipation, improve the heat dissipation efficiency, and the connection of the temperature sensor and the small heat dissipation fan can automatically start and stop the fan according to the internal temperature, realize intelligent heat dissipation, avoid invalid energy consumption, and the dustproof plate can prevent external dust from entering and affecting the internal components, further alleviate the device aging problem caused by poor heat dissipation of the shell.

[0017] 3. The present application provides a controller for a nitrogen oxide sensor, which can realize quick sealing and disassembly of the shell by setting the lugs and buckles in cooperation, prevent external water vapor and dust from entering the inside in the sealed state, protect the circuit components, reduce the aging caused by environmental factors, and the convenient disassembly method is convenient for later maintenance and repair, indirectly prolongs the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application; Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present application; Figure 3 It is an exploded structure schematic diagram of the bottom plate, side plate and sealing cover plate of the present application; Figure 4 It is an exploded structure schematic diagram of the heat dissipation component of the present application; Figure 5The three-dimensional structural schematic diagram of the dynamic control module, the signal processing circuit and the power management circuit of the application; Figure 6 The connection structure schematic diagram of the silicon carbide plate, the circuit board and the positioning heat-conducting copper column of the application; Figure 7 The electronic element connection schematic diagram of the dynamic control module, the signal processing circuit and the power management circuit of the application.

[0019] Wherein, 1, the bottom plate; 101, the heat dissipation fin; 2, the side plate; 3, the heat dissipation assembly; 301, the air pipe; 302, the dustproof plate; 303, the support; 304, the small heat dissipation fan; 4, the temperature sensor; 5, the silicon carbide plate; 6, the circuit board; 7, the dynamic control module; 701, the control unit module; 702, the first connecting end; 8, the signal processing circuit; 801, the signal receiving module; 802, the second connecting end; 803, the operational amplifier; 804, the filter circuit module; 805, the AD conversion module; 9, the power management circuit; 901, the power management module; 902, the third connecting end; 903, the energy storage module; 904, the power consumption control module; 905, the power conversion module; 906, the voltage stabilizing module; 10, the heat-conducting silica gel pad; 11, the sealing cover plate; 12, the buckle; 13, the protruding block; 14, the positioning heat-conducting copper column. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings Figure 1 - the drawings Figure 7 , the application is further described in detail.

[0021] Example 1: a controller of a nitrogen-oxygen sensor, please refer to Figure 1 , Figure 2 and Figure 4The application provides a controller of a nitrogen-oxygen sensor, which adopts the following technical scheme: a bottom plate 1 is provided, equidistantly arranged heat dissipation fins 101 are fixedly connected to the bottom surface of the bottom plate 1, a side plate 2 is fixedly connected to the upper side of the bottom plate 1, a heat dissipation assembly 3 is arranged on the inner side of the side plate 2, the heat dissipation assembly 3 comprises two air pipes 301 fixedly connected to the inner side of the side plate 2, the inner sides of the two air pipes 301 are fixedly connected with dust separation plates 302, the inner side of one of the air pipes 301 is fixedly connected with a support 303, two small heat dissipation fans 304 are fixedly installed on the inner side of the support 303, the small heat dissipation fans 304 are electrically connected with a temperature sensor 4, the small heat dissipation fans 304 can accelerate the air flow in the shell, cooperate with the air pipes 301 to form convection heat dissipation, improve the heat dissipation efficiency, meanwhile, the connection of the temperature sensor 4 and the small heat dissipation fans 304 can automatically start and stop the fans according to the internal temperature, realize intelligent heat dissipation, avoid invalid energy consumption, meanwhile, the dust separation plates 302 can prevent external dust from entering and affecting the internal components, further alleviate the device aging problem caused by poor shell heat dissipation, the temperature sensor 4 is fixedly installed on the inner side of the side plate 2, a control module is installed in the temperature sensor 4, and a temperature threshold is set in the control module, when the temperature in the controller is higher than the threshold, the temperature sensor 4 can control the heat dissipation assembly 3 to start and efficiently dissipate heat, the upper side of the bottom plate 1 is fixedly connected with a silicon carbide plate 5, the silicon carbide plate 5 is installed on the upper side of the bottom plate 1, the silicon carbide plate 5 is located at the center of the side plate 2 and is not connected with the side plate 2, the silicon carbide plate 5 is not connected with the side plate 2, the silicon carbide material of the silicon carbide plate 5 has excellent insulation and heat conduction, so that the heat transferred by the circuit board 6 and the positioning heat conduction copper column 14 can be stably conducted to the bottom plate 1 on the bottom, dissipated through the heat dissipation fins 101, and the overall heat dissipation capacity is enhanced, the circuit board 6 is placed on the upper side of the silicon carbide plate 5, a dynamic control module 7, a signal processing circuit 8 and a power management circuit 9 are integrated on the upper side of the circuit board 6, a heat conduction silica gel pad 10 is fixedly bonded on the inner side of the side plate 2, the dynamic control module 7 is in communication connection with the signal processing circuit 8 and an engine control unit.

[0022] Please refer to Figure 2 , Figure 5 and Figure 7The dynamic control module 7 comprises a control unit module 701, a first connecting end 702 is fixedly installed on the outer side of the control unit module 701, a wireless transmission module is integrated on the inner side of the control unit module 701, the control unit module 701 is electrically connected with the external nitrogen oxygen sensor, the outer side of the first connecting end 702 is fixedly connected to the inner side of the side plate 2 through a bolt, the first connecting end 702 is electrically connected with the external engine control unit, the control unit module 701 is connected with the engine control unit through the first connecting end 702, can efficiently receive the engine operation parameters, can flexibly transmit and receive data, at the same time, the dynamic control module 7 adjusts the control logic based on these parameters, breaks the single control mode of the fixed threshold, and then the wireless transmission module integrated in the control unit module 701 can control the nitrogen oxygen sensor to measure the nitrogen oxide compound value, to ensure the accuracy of the vehicle emission test result.

[0023] Please refer to Figure 2 、 Figure 5 and Figure 7 , the signal processing circuit 8 is composed of a signal receiving module 801, an operational amplifier 803, a filter circuit module 804 and an AD conversion module 805, a second connecting end 802 is fixedly installed on the outer side of the signal receiving module 801, the outer side of the second connecting end 802 is fixedly connected to the inner side of the side plate 2 through a bolt, the second connecting end 802 is electrically connected with the external nitrogen oxygen sensor, the signal receiving module 801 is stably connected with the external nitrogen oxygen sensor through the second connecting end 802, can ensure that the nitrogen oxide compound concentration signal collected by the sensor is efficiently transmitted to the signal processing circuit 8, provides a stable input basis for subsequent signal amplification, filtering and other processing, reduces the loss and interference in the signal transmission process, indirectly improves the monitoring accuracy under complex working conditions, the output end of the signal receiving module 801 and the input end of the operational amplifier 803 are electrically connected, the output end of the operational amplifier 803 and the input end of the filter circuit module 804 are electrically connected, the output end of the filter circuit module 804 and the input end of the AD conversion module 805 are electrically connected, the output end of the AD conversion module 805 and the input end of the control unit module 701 are electrically connected, the signal receiving module 801, the operational amplifier 803, the filter circuit module 804 and the AD conversion module 805 in the above-mentioned signal processing circuit 8 are connected in sequence, forming a complete signal processing process, can optimize the weak signal output by the sensor step by step, reduce the influence of interference signals, make the processed signal more accurately transmitted to the control unit module 701, provide reliable data support for the dynamic control strategy, and help to meet the complex working condition requirements.

[0024] Please refer to Figure 2 、 Figure 5 and Figure 7The power management circuit 9 is composed of a power management module 901, an energy storage module 903, a power consumption control module 904, a power conversion module 905 and a voltage stabilizing module 906. The outer side of the power management module 901 is fixedly installed with a third connecting end 902, the outer side of the third connecting end 902 is inserted into the inner side of the side plate 2, and the power management module 901 is electrically connected with the external power source through the third connecting end 902. The power management module 901 is stably connected with the external power source through the third connecting end 902, which can ensure that the external power is efficiently input into the power management circuit 9, provide a stable basis for subsequent power conversion, voltage stabilization and other processes, reduce the energy consumption fluctuation caused by unstable power supply, assist in improving the efficiency of the power management circuit, guarantee the endurance of the equipment, and the energy storage module 903, the power consumption control module 904 and the power conversion module 905 are electrically connected with the power management module 901. The output end of the energy storage module 903 and the input end of the voltage stabilizing module 906 are electrically connected, the output end of the power consumption control module 904 and the input end of the power conversion module 905 are electrically connected, the output end of the power conversion module 905 and the input end of the voltage stabilizing module 906 are electrically connected, and the output end of the voltage stabilizing module 906 and the input end of the signal receiving module 801 are electrically connected. The cooperation between the power management module 901, the energy storage module 903, the power consumption control module 904, the power conversion module 905 and the voltage stabilizing module 906 can realize efficient conversion and dynamic management of the power source. At this time, the power consumption control module 904 can adjust the power supply mode according to the working state to reduce invalid energy consumption, the energy storage module 903 can provide temporary power when the power supply is abnormal, significantly improve the power management efficiency, prolong the endurance of the equipment, and solve the problem of low efficiency of the existing power management circuit.

[0025] Embodiment 2: A controller of a nitrogen-oxygen sensor, please refer to Figure 1 , Figure 3 and Figure 6The outer side of the side plate 2 is fixedly connected with a plurality of symmetrically arranged protrusions 13, the upper side of the side plate 2 is provided with a sealing cover plate 11, the outer side of the sealing cover plate 11 is fixedly connected with a plurality of buckles 12, the buckle 12 and the protrusion 13 are in clamping connection, the protrusion 13 is in clamping connection with the buckle 12, the quick sealing and disassembly of the shell can be realized, the outside water vapor and dust can be prevented from entering the inside in the sealed state, the circuit elements are protected, the aging caused by environmental factors is reduced, the convenient disassembly mode is convenient for later maintenance and repair, the service life of the equipment is indirectly improved, the output end of the operational amplifier 803 and the input end of the filter circuit module 804 are electrically connected through a shielding cable, the connection of the above-mentioned operational amplifier 803 and the filter circuit module 804 through the shielding cable can effectively block the influence of external electromagnetic interference on the transmission signal, ensure that the amplified signal remains stable during transmission to the filter circuit module 804, reduce signal distortion, improve signal processing precision, and provide protection for stable work of the controller in a complex electromagnetic environment, the upper side of the silicon carbide plate 5 is fixedly connected with a plurality of positioning heat-conducting copper columns 14, the outer side of the circuit board 6 is provided with a plurality of perforations matched with the positioning heat-conducting copper columns 14, the outer side of the positioning heat-conducting copper column 14 is inserted into the inner side of the perforation, the insulation property of the above-mentioned silicon carbide plate 5 can avoid circuit interference between the circuit board 6 and the bottom plate 1, ensure circuit safety, and the positioning heat-conducting copper column 14 can not only accurately fix the circuit board 6 to prevent displacement, but also conduct heat generated by the circuit board 6 during work to the bottom plate 1, dissipate through the heat dissipation structure of the bottom plate 1, enhance overall heat dissipation capacity, reduce device aging caused by local overheating, and improve equipment reliability.

[0026] The implementation principle of the embodiment of the application is as follows: when the controller of the nitrogen oxygen sensor works, the external power supply is connected to the power management module 901 through the third connecting end 902, the power management module 901 distributes power to the energy storage module 903, the power consumption control module 904 and the power conversion module 905, at this time, the power consumption control module 904 monitors the circuit working state in real time, adjusts the output of the power conversion module 905 according to the demand, the voltage converted by the power conversion module 905 is input to the voltage stabilizing module 906, and the energy storage module 903 can store energy for use in the case of power supply anomaly, then the voltage stabilizing module 906 outputs stable voltage to supply power to the signal receiving module 801 and other circuit components, greatly improving the power management efficiency and reducing invalid energy consumption. Then, the nitrogen oxide compound concentration signal collected by the external nitrogen oxygen sensor is transmitted to the signal receiving module 801 through the second connecting end 802, the signal is transmitted to the operational amplifier 803 for amplification, the amplified signal is transmitted to the filter circuit module 804 through the shielded cable, and after the interference signal is filtered out, it enters the AD conversion module 805, the analog signal is converted into a digital signal by the AD conversion module 805 and transmitted to the control unit module 701, at this time, the control unit module 701 receives the engine operating parameters sent by the engine control unit through the first connecting end 702, combines the received digital signal, and no longer relies on the fixed threshold value, but dynamically adjusts the working mode of the signal processing circuit 8 and the measurement logic of the nitrogen oxygen sensor according to the parameter change. Then in the process of heat dissipation, the heat generated by the circuit board 6 is transmitted to the bottom plate 1 through the positioning heat-conducting copper column 14 and the silicon carbide plate 5, the heat dissipation fins 101 on the bottom surface of the bottom plate 1 increase the heat dissipation area and accelerate the heat dissipation, at the same time, the heat-conducting silica gel pad 10 in the inner side of the side plate 2 conducts heat to the side plate 2, further improving the heat dissipation performance, at the same time, the temperature sensor 4 monitors the internal temperature of the controller, when the temperature reaches the set value, the small-sized heat dissipation fan 304 is started to cooperate with the air pipe 301 to form convection and discharge the internal heat, the dustproof plate 302 prevents dust from entering and affecting the work of the elements, then the sealing cover plate 11 is clamped with the protrusion 13 of the side plate 2 through the buckle 12, realizing rapid sealing of the shell to prevent water vapor and dust from entering, and protecting the internal electronic elements.

[0027] The embodiments of the specific implementation are the preferred embodiments of the application, and are not intended to limit the protection scope of the application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A controller for a nitric oxide sensor comprising a backplane (1) characterised in that: The bottom surface of the bottom plate (1) is fixedly connected with equidistantly arranged heat dissipation fins (101), the upper side of the bottom plate (1) is fixedly connected with a side plate (2), the inner side of the side plate (2) is provided with a heat dissipation assembly (3), the inner side of the side plate (2) is fixedly installed with a temperature sensor (4), the upper side of the bottom plate (1) is fixedly connected with a silicon carbide plate (5), the upper side of the silicon carbide plate (5) is placed with a circuit board (6), the upper side of the circuit board (6) is integrated with a dynamic control module (7), a signal processing circuit (8) and a power management circuit (9), the dynamic control module (7) comprises a control unit module (701), the signal processing circuit (8) is composed of a signal receiving module (801), an operational amplifier (803), a filter circuit module (804) and an AD conversion module (805), the power management circuit (9) is composed of a power management module (901), an energy storage module (903), a power consumption control module (904), a power conversion module (905) and a voltage stabilizing module (906), the inner side of the side plate (2) is fixedly bonded with a heat-conducting silica gel pad (10), and the dynamic control module (7) is in communication connection with the signal processing circuit (8) and an engine control unit respectively.

2. A controller for a nitric oxide sensor according to claim 1, wherein: The heat dissipation assembly (3) comprises two air pipes (301) fixedly connected to the inner side of the side plate (2), the inner side of each of the two air pipes (301) is fixedly connected with a dust separation plate (302), the inner side of one of the air pipes (301) is fixedly connected with a support (303), the inner side of the support (303) is fixedly installed with two small-sized heat dissipation fans (304), and the small-sized heat dissipation fans (304) are in electric connection with the temperature sensor (4).

3. A controller for a nitric oxide sensor according to claim 2, wherein: The outer side of the side plate (2) is fixedly connected with a plurality of symmetrically arranged protrusions (13), the upper side of the side plate (2) is provided with a sealing cover plate (11), the outer side of the sealing cover plate (11) is fixedly connected with a plurality of buckles (12), and the buckles (12) and the protrusions (13) are in clamping connection.

4. The controller of claim 1, wherein: The outer side of the control unit module (701) is fixedly installed with a first connecting end (702), the inner side of the control unit module (701) is integrated with a wireless transmission module, the control unit module (701) is in electric connection with an external nitrogen oxygen sensor, the outer side of the first connecting end (702) is fixedly connected to the inner side of the side plate (2) through bolts, and the first connecting end (702) is in electric connection with an external engine control unit.

5. The controller of a nitric oxide sensor according to claim 1, wherein: The outer side of the signal receiving module (801) is fixedly installed with a second connecting end (802), the outer side of the second connecting end (802) is fixedly connected to the inner side of the side plate (2) through bolts, and the second connecting end (802) is in electric connection with an external nitrogen oxygen sensor.

6. A controller for a nitric oxide sensor according to claim 5, wherein: The output end of the signal receiving module (801) is electrically connected with the input end of the operational amplifier (803), the output end of the operational amplifier (803) is electrically connected with the input end of the filter circuit module (804), the output end of the filter circuit module (804) is electrically connected with the input end of the AD conversion module (805), and the output end of the AD conversion module (805) is electrically connected with the input end of the control unit module (701).

7. A controller for a nitric oxide sensor according to claim 5, wherein: The output end of the operational amplifier (803) is electrically connected with the input end of the filter circuit module (804) through a shielded cable.

8. The controller of a nitric oxide sensor according to claim 1, wherein: A third connecting end (902) is fixedly installed outside the power management module (901), the third connecting end (902) is inserted into the inside of the side plate (2), and the power management module (901) is electrically connected with an external power source through the third connecting end (902).

9. A controller for a nitric oxide sensor according to claim 8, wherein: The energy storage module (903), the power consumption control module (904) and the power conversion module (905) are electrically connected with the power management module (901), the output end of the energy storage module (903) is electrically connected with the input end of the voltage stabilizing module (906), the output end of the power consumption control module (904) is electrically connected with the input end of the power conversion module (905), the output end of the power conversion module (905) is electrically connected with the input end of the voltage stabilizing module (906), and the output end of the voltage stabilizing module (906) is electrically connected with the input end of the signal receiving module (801).

10. The controller of a nitric oxide sensor according to claim 1, wherein: A plurality of positioning heat-conducting copper columns (14) are fixedly connected to the upper side of the silicon carbide plate (5), a plurality of through holes matched with the positioning heat-conducting copper columns (14) are formed in the outer side of the circuit board (6), and the outer side of the positioning heat-conducting copper columns (14) is inserted into the inner side of the through holes.

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