Electronic injection throttle valve pressure sensor

Abstract

The utility model discloses an electronic injection throttle valve pressure sensor, and belongs to the field of engine management systems. The sensor comprises a detection shell, a piston assembly, an elastic supporting unit, a pressure sensing unit, a signal processing circuit and a controller. The detection shell is fixedly connected with the throttle valve through a threaded head, a piston cavity is formed in the detection shell, and the piston assembly is slidably installed in the piston cavity and used for responding to pressing input of air pressure changes in the throttle valve. The pressure sensing unit comprises a multi-stage capacitance sensing element and a temperature detection element, can detect the movement depth and the air pressure change of the piston assembly in real time, carries out dynamic compensation in combination with temperature detection data, improves the measurement precision, and is used for adjusting the fuel injection quantity, the ignition time and the throttle opening of an engine. The pressure sensor has the advantages of high detection sensitivity, high measurement precision and adaptability to high-temperature and high-vibration environments, and is suitable for pressure monitoring and control in an automobile engine management system.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, specifically to an electronic fuel injection throttle pressure sensor. Background Technology

[0002] In modern engine management systems, the electronic fuel injection throttle pressure sensor is a crucial component for controlling engine fuel injection quantity, ignition timing, and throttle opening. Traditional pressure sensors typically employ piezoresistive or strain gauge pressure detection structures. These sensors primarily detect pressure by detecting changes in electrical signals caused by mechanical deformation; signal processing is relatively simple and can meet basic pressure detection requirements. Such sensors typically include a fixed pressure-sensing diaphragm, an elastic support assembly, and electronic circuitry for signal output. The diaphragm's deformation reflects changes in air pressure, and the signal is transmitted to the vehicle's electronic control unit (ECU).

[0003] However, the above-mentioned traditional technical solutions have the following significant drawbacks in practical applications:

[0004] Insufficient accuracy: Traditional piezoresistive or strain gauge sensors have limited sensitivity to changes in air pressure, especially under low pressure or small air pressure fluctuations, making it difficult to perform high-precision measurements and resulting in large detection errors.

[0005] Temperature has a significant impact: The pressure detection diaphragm and elastic support components of traditional sensors are usually significantly affected by high-temperature environments. Under high-temperature conditions in the engine compartment (such as exceeding 100°C), the pressure signal is prone to drift, and the long-term stability and accuracy of the measurement cannot be guaranteed.

[0006] Lack of compensation function: Traditional sensors are mostly single-structure designs and are not equipped with dynamic temperature compensation modules. They cannot correct detection errors caused by temperature changes in real time, thus reducing reliability under complex working conditions.

[0007] Slow dynamic response: Due to the limited deformation transmission speed of mechanical components, the sensor has a low real-time response capability to changes in air pressure, especially in the rapidly changing airflow conditions inside the throttle, and cannot sensitively capture air pressure fluctuations.

[0008] In summary, traditional pressure sensors have shortcomings in terms of accuracy, resistance to temperature effects, and dynamic response speed, making it difficult to meet the high precision, real-time performance, and reliability requirements of modern engines. Therefore, there is an urgent need for an improved electronic fuel injection throttle pressure sensor that can sensitively respond to changes in air pressure, incorporate temperature compensation, and achieve high-precision pressure detection, in order to improve the control accuracy and reliability of engine performance. Utility Model Content

[0009] The present invention aims to solve the technical problems existing in the prior art or related technologies.

[0010] This utility model relates to an electronic fuel injection throttle pressure sensor, belonging to the field of engine management systems. Specifically, it is a high-precision pressure sensor that can sensitively detect changes in air pressure and has temperature compensation function.

[0011] This utility model comprises the following components:

[0012] Detection housing: The outer surface of the detection housing is provided with threaded ends for connection and fixation with the electronic fuel injection throttle body; its interior is provided with a piston chamber for accommodating the piston assembly and elastic support unit; the housing is also provided with a connector for outputting sensor signals to the electronic control unit (ECU).

[0013] Piston assembly: The piston assembly is slidably mounted in the piston chamber and is used for the press input of changes in air pressure in the electronic fuel injection throttle valve; the outer wall of the piston is equipped with a sealing ring to prevent gas leakage and ensure the sensitivity of movement. The piston assembly is made of high temperature and corrosion resistant materials to adapt to the high temperature and high vibration environment of the engine compartment.

[0014] Elastic support unit: The elastic support unit is located inside the piston cavity and connected to the piston assembly to provide the piston's rebound force. The elastic support unit can be made of shape memory alloy springs or temperature-adaptive polymer elastomers to reduce the impact of ambient temperature changes on its elastic properties.

[0015] Pressure Sensing Unit: The pressure sensing unit includes a multi-stage capacitive sensing element and a temperature sensing element. The multi-stage capacitive sensing element consists of a fixed conductor plate and a movable conductor plate. The movable conductor plate is fixed to the surface of the piston assembly, and the fixed conductor plate is fixed to the inside of the detection housing. It is used to detect the movement depth of the piston assembly and changes in air pressure in real time. The temperature sensing element is used to detect the ambient temperature inside or outside the throttle body. Combined with the capacitive signal, data compensation is performed to further improve the accuracy and stability of pressure measurement.

[0016] The temperature detection element is a thermistor or a miniature temperature sensor, which is installed inside the sensor housing and is used to monitor the throttle body ambient temperature in real time.

[0017] Signal processing circuit: Connected to the pressure sensing unit, the signal processing circuit integrates and analyzes the detected pressure and temperature signals to generate a compensated pressure measurement value. The signal processing circuit includes a pressure compensation module and a data fusion module, capable of adjusting the pressure detection output value according to changes in ambient temperature and generating a precise compensated pressure value.

[0018] Controller: The controller has a preset mapping relationship between pressure value and output signal. When the compensated pressure value reaches different thresholds, it triggers the corresponding control command to be output to the electronic control unit (ECU). The controller is connected to the signal processing circuit to generate the corresponding output signal according to the compensated pressure value and transmits it to the ECU through the connector to achieve precise control of engine fuel injection quantity, ignition timing and throttle opening.

[0019] Technical features and advantages

[0020] Sensitive detection and high-precision measurement: This invention achieves sensitive response and high-precision detection of air pressure changes by combining a piston assembly with a multi-stage capacitive sensing element. The detection range can reach 0-500kPa, and the detection accuracy is as high as ±0.1kPa.

[0021] Dynamic temperature compensation function: This utility model, through the pressure compensation module and dynamic calibration module in the signal processing circuit, combined with the temperature detection element, can dynamically compensate the pressure detection signal according to real-time temperature changes, avoid detection errors caused by high temperature, and ensure measurement stability and accuracy under long-term working conditions.

[0022] Adaptable to high temperature and high vibration environments: The test housing and piston assembly are made of high temperature and corrosion resistant materials with excellent sealing performance, enabling stable operation under high temperature and high vibration conditions in the engine compartment; the housing meets the IP67 protection level requirements, further improving reliability.

[0023] Precise control and multi-functional applications: The compensation pressure value generated by this invention can be directly used to control the engine's fuel injection quantity, ignition timing, and throttle opening, achieving more precise combustion control and higher engine performance.

[0024] The beneficial effects achieved by this utility model are as follows:

[0025] 1. In this utility model, through the cooperation of the piston assembly and the elastic support unit, it can sensitively respond to changes in air pressure inside the electronic fuel injection throttle valve. The multi-stage capacitive sensing element detects the movement depth of the piston assembly in real time, enabling high-precision measurement of air pressure changes. Combined with the temperature detection element, data compensation is performed to improve measurement accuracy.

[0026] 2. In this utility model, the dynamic calibration module in the signal processing circuit can automatically calibrate the pressure detection element according to real-time temperature changes, ensuring measurement accuracy under long-term working conditions, realizing temperature compensation, and avoiding the problem of inaccurate pressure detection caused by high temperature. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0028] Figure 2 This is a cross-sectional structural diagram of one embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the control structure of one embodiment of the present invention.

[0030] Figure label:

[0031] 100. Detection housing; 110. Thread end; 120. Connector; 111. Piston chamber;

[0032] 200 Piston assembly; 300 Elastic support unit; 400 Pressure sensing unit; 410 Fixed conductor plate; 420 Movable conductor plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0034] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0035] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing an electronic fuel injection throttle pressure sensor.

[0036] like Figures 1 to 3 As shown, this utility model provides an electronic fuel injection throttle pressure sensor, including a detection housing 100, a piston assembly 200, an elastic support unit 300, a pressure sensing unit 400, a signal processing circuit, and a controller.

[0037] Test housing 100

[0038] The outer surface of the detection housing 100 is provided with threaded ends 110 for fixed connection with the surface of the electronic fuel injection throttle body. The housing contains a piston chamber 111 to accommodate the piston assembly 200 and the elastic support unit 300. A connector 120 is also provided on the housing for outputting the detected signal to the electronic control unit (ECU). The detection housing is made of high-temperature and corrosion-resistant material, has an IP67 protection rating, and can withstand the high-temperature and high-vibration environment of the engine compartment.

[0039] Piston assembly 200

[0040] The piston assembly 200 is slidably mounted within the piston chamber 111 and is used for press input that senses changes in the internal air pressure of the electronic fuel injection throttle valve. A sealing ring is provided on the outer wall of the piston assembly to prevent gas leakage and ensure sensitive piston movement. The piston assembly is made of aluminum alloy or engineering plastic, possessing excellent high-temperature resistance and corrosion resistance, enabling long-term stable operation under high-load conditions.

[0041] 300 elastic support unit

[0042] An elastic support unit 300 is disposed within the piston chamber 111 and connected to the piston assembly 200. It provides a rebound force to ensure that the piston can respond quickly and reset when the air pressure changes. The elastic support unit preferably uses a shape memory alloy spring or a temperature-adaptive polymer elastomer to reduce the impact of ambient temperature changes on the elastic performance and further improve the sensitivity and stability of the piston assembly.

[0043] Pressure sensing unit 400

[0044] The pressure sensing unit 400 includes a multi-stage capacitive sensing element and a temperature sensing element. The multi-stage capacitive sensing element consists of a fixed conductor plate 410 and a movable conductor plate 420. The movable conductor plate 420 is fixed to the surface of the piston assembly 200, and the fixed conductor plate 410 is fixed inside the detection housing 100. It is used to detect the movement depth of the piston assembly and its pressure condition. The temperature sensing element is located inside the sensor housing and is used to monitor the throttle body ambient temperature in real time. Through the coordinated operation of the temperature sensing element and the multi-stage capacitive sensing element, the influence of temperature on pressure measurement can be dynamically compensated, improving measurement accuracy.

[0045] The temperature detection element is a thermistor or a miniature temperature sensor, which is installed inside the sensor housing and is used to monitor the throttle body ambient temperature in real time.

[0046] Signal processing circuit

[0047] The signal processing circuit is connected to the pressure sensing unit 400 and is used to process the detected pressure and temperature signals. The signal processing circuit includes:

[0048] Pressure compensation module: Adjusts the pressure detection signal according to changes in ambient temperature to perform real-time compensation;

[0049] Data fusion module: fuses the compensated pressure signal with the temperature signal to generate the final pressure measurement value;

[0050] Dynamic calibration module: Based on the sensor's working environment and real-time data, it automatically calibrates the output signal of the pressure sensing element to ensure measurement accuracy.

[0051] controller

[0052] The controller has a preset mapping relationship between pressure values ​​and output signals. When the compensated pressure value reaches different thresholds, it triggers the corresponding control command output to the electronic control unit (ECU). The controller is connected to the signal processing circuit to generate the corresponding output signal based on the compensated pressure value. The controller transmits the signal to the ECU through connector 120 and participates in the precise control of the engine's fuel injection quantity, ignition timing, and throttle opening.

[0053] Implementation process

[0054] In practical use, the sensor's threaded end 110 is fixedly connected to the throttle body surface.

[0055] When the internal air pressure of the electronic fuel injection throttle valve changes, the air pressure acts on the piston assembly 200, causing it to slide within the piston chamber 111.

[0056] The movement of the piston assembly causes changes in the capacitance of the multi-stage capacitive sensing element, while the temperature detection element monitors the ambient temperature in real time.

[0057] The signal processing circuit analyzes and compensates for the pressure and temperature signals to generate accurate pressure measurements.

[0058] The controller converts the compensated pressure value into a control signal and transmits it to the electronic control unit (ECU) to adjust the engine fuel injection quantity, ignition timing, and throttle opening.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A throttle pressure sensor for electronic fuel injection, characterized in that, include: The detection housing (100) has a threaded end (110) connected to the surface of the electronic fuel injection throttle valve and a connector (120) for signal output. The inner side of the threaded end (110) has a piston chamber (111). Piston assembly (200), slidably mounted in piston chamber, for press input to receive changes in air pressure within the electronic fuel injection throttle valve; An elastic support unit (300) is disposed inside the piston chamber and connected to the piston assembly; The pressure sensing unit (400) includes a multi-stage capacitive sensing element and a temperature sensing element. The multi-stage capacitive sensing element includes a fixed conductor plate (410) and a movable conductor plate (420). The movable conductor plate (420) is fixed to the surface of the piston assembly (200), and the fixed conductor plate (410) is fixed to the inside of the detection housing (100). The multi-stage capacitive sensing element is used to detect the change in capacitance between the conductor plates when the piston assembly is under pressure and to obtain the movement depth, thereby detecting the pressure value of the piston assembly (200) under air pressure in real time. The temperature sensing element is used to detect the temperature inside or outside the throttle valve. A signal processing circuit, connected to the pressure sensing unit, is used to comprehensively analyze the detected pressure and temperature signals and generate a compensated pressure measurement value. The controller, connected to the signal processing circuit, is used to generate a corresponding output signal based on the compensated pressure value and transmit it to the electronic control unit (ECU).

2. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The temperature detection element is a thermistor or a miniature temperature sensor, which is installed inside the sensor housing and is used to monitor the ambient temperature of the throttle valve in real time.

3. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The signal processing circuit includes: The pressure compensation module is used to adjust the output value of the pressure sensing element according to changes in ambient temperature. The data fusion module is used to integrate pressure and temperature signals to generate compensated pressure measurement values.

4. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The controller has a preset mapping relationship between pressure value and output signal. When the compensated pressure value reaches different thresholds, it triggers the corresponding control command to be output to the electronic control unit (ECU).

5. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The elastic support unit (300) is a shape memory alloy spring or a temperature-adaptive polymer elastomer, used to reduce the impact of environmental temperature changes on elastic performance.

6. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The piston assembly (200) is provided with a sealing ring on its outer wall to prevent gas leakage inside the throttle valve and to ensure the sensitive movement of the piston assembly. The piston assembly (200) is made of high temperature and corrosion resistant material to adapt to the high temperature and high vibration environment of the engine compartment.

7. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The detection range of the multi-stage capacitive sensing element is 0-500 kPa, and the detection accuracy can reach ±0.1 kPa.

8. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The controller is connected to the electronic control unit (ECU) via a connector (120) and uses the compensated pressure value to precisely adjust the engine's fuel injection quantity, ignition timing, and throttle opening.

9. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The signal processing circuit also includes a dynamic calibration module, which is used to automatically calibrate the pressure sensing element according to real-time temperature changes to ensure measurement accuracy.

10. The electronic fuel injection throttle pressure sensor according to claim 1, characterized in that, The detection housing (100) is made of high temperature and corrosion resistant material and has an IP67 protection rating, which can adapt to the high temperature and high vibration working environment of the engine compartment.

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