Integrated temperature and pressure sensor for automobile heat pump system

Abstract

The utility model discloses an integrated temperature and pressure sensor for an automobile heat pump system, which is characterized in that a temperature sensing unit and a pressure sensing unit are integrated in an integrated sensor shell made of a high-temperature-resistant aluminum alloy material, and double probes at the front end are arranged in parallel and share a medium contact surface, so that temperature and pressure data can be synchronously acquired. A silica gel shock pad is arranged between the shell and the probe, vibration influence can be reduced, the shell is provided with radiating fins and filled with heat-conducting silicone grease, and temperature measurement is facilitated. The sensor can be installed at multiple key positions of a heat pump system, the integrated design enables the installation space to be reduced by 80%, the system cost to be reduced by 15%, the system response speed to be improved by 30%, the defects of a traditional sensor are effectively overcome, and the monitoring and control level of the heat pump system is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive heat pump system technology, specifically to an integrated temperature and pressure sensor for automotive heat pump systems. Background Technology

[0002] As a core component of thermal management in new energy vehicles, automotive heat pump systems achieve heating or cooling of the vehicle cabin through refrigerant phase change cycles. In traditional heat pump systems, temperature and pressure sensors are typically installed independently at key points such as the evaporator, condenser, and compressor, which presents the following significant problems:

[0003] Dispersed installation: Independent sensors occupy a lot of space and have complex wiring, which increases installation costs and system complexity;

[0004] Signal asynchrony: There is a time difference in the acquisition of temperature and pressure data, which causes the operating condition data on which the control algorithm is based to lack real-time correlation, affecting the system's regulation accuracy;

[0005] Poor anti-interference capability: Vibrations and electromagnetic environment during vehicle operation can easily interfere with the signal transmission of independent sensors, leading to data distortion and affecting system reliability.

[0006] Therefore, there is an urgent need for an integrated and highly reliable sensor solution to overcome the shortcomings of traditional discrete sensors and meet the requirements of automotive heat pump systems for compact layout, precise control, and stable operation. Utility Model Content

[0007] The purpose of this invention is to provide an integrated temperature and pressure sensor that, through structural integration and signal co-processing, enables synchronous acquisition and efficient processing of temperature and pressure data, optimizes the operating condition monitoring efficiency of automotive heat pump systems, and improves system control accuracy, energy efficiency, and reliability.

[0008] An integrated temperature and pressure sensor for an automotive heat pump system includes: an integrated sensor housing, which houses a signal processing module, a temperature sensing unit, and a pressure sensing unit. The temperature probe of the temperature sensing unit and the pressure diaphragm of the pressure sensing unit form a dual-probe structure. The dual-probe structure is arranged parallel to each other at the front end of the integrated sensor housing and shares the same medium contact surface. The side of the integrated sensor housing is provided with an output interface for outputting signals.

[0009] As a preferred embodiment of this utility model, a silicone shock-absorbing pad is embedded at the connection between the integrated sensor housing and the dual-probe structure.

[0010] In a preferred embodiment of this utility model, the signal processing module includes an analog-to-digital converter (ADC) for converting analog signals from the temperature sensing unit and the pressure sensing unit into digital signals and outputting them through an output interface. The signal processing module also includes a signal filtering circuit for filtering the converted digital signals to improve signal stability and anti-interference capability.

[0011] As a preferred embodiment of this utility model, the surface of the integrated sensor housing is provided with heat dissipation fins and the interior is filled with thermally conductive silicone grease.

[0012] As a preferred embodiment of this utility model, the integrated sensor housing includes an upper shell and a lower shell, which are connected by fine thread and sealed with an O-ring.

[0013] As a preferred embodiment of this utility model, the bottom of the lower shell is provided with a threaded interface for fixing to the high-pressure side, low-pressure side, or expansion valve inlet and outlet of the automotive heat pump system.

[0014] As a preferred embodiment of this utility model, the housing of the integrated sensor is made of high-temperature resistant aluminum alloy.

[0015] As a preferred embodiment of this utility model, the output interface is a communication interface that supports the CAN FD protocol and has a transmission rate of 2Mbps.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] This utility model's integrated design reduces installation space by 80%, simplifies wiring, reduces the number of wire harnesses and independent sensors, and lowers the cost of a single heat pump system by 15%, making it suitable for compact car layouts. It simultaneously collects temperature and pressure data, eliminates signal time differences, significantly improves data correlation, increases system response speed by 30%, and optimizes the real-time adjustment capability of the heat pump controller. The silicone shock-absorbing pads and heat dissipation design reduce the impact of vibration and temperature on measurements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0019] In the diagram: 1. Integrated sensor housing; 2. Signal processing module; 3. Temperature sensing unit; 4. Temperature probe; 5. Pressure sensing unit; 6. Pressure diaphragm; 7. Upper shell; 8. Lower shell; 9. Silicone shock-absorbing pad; 10. Output interface; 11. Threaded interface; 12. Heat sink fins. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Example 1

[0022] like Figure 1 As shown, a specific embodiment of the integrated temperature and pressure sensor for an automotive heat pump system according to this utility model includes:

[0023] Integrated sensor housing 1: The housing is made of high-temperature resistant aluminum alloy and integrates a temperature sensing unit 3 and a pressure sensing unit 5. The front end of the housing is designed with a dual-probe structure. The temperature probe 4 of the temperature sensing unit 3 and the pressure diaphragm 6 of the pressure sensing unit 5 are set in parallel and share the same medium contact surface to realize the synchronous detection of temperature and pressure of the refrigerant pipeline. A silicone shock-absorbing pad 9 is embedded at the connection between the housing and the probe to reduce the impact of vehicle vibration on measurement accuracy. The surface of the housing is provided with heat dissipation fins 12 and the inside is filled with thermally conductive silicone grease to ensure that the temperature probe 4 responds quickly to changes in medium temperature. The integrated sensor housing 1 includes an upper shell 7 and a lower shell 8. The upper shell 7 and the lower shell 8 are connected by fine thread and sealed with an O-ring.

[0024] Signal processing module 2: It has a built-in signal conditioning circuit and data fusion algorithm. The signal conditioning circuit converts the analog signals from temperature sensing unit 3 (using PT1000 sensor) and pressure sensing unit 5 (using MEMS piezoresistive sensor) into digital signals and outputs them to the heat pump controller via CAN bus. The data fusion algorithm performs cross-validation on the data based on the physical relationship between temperature and pressure to improve data reliability. Signal processing module 2 uses an MSP430 series microcontroller and can be directly connected to PT1000 and MEMS pressure sensors. The signal conditioning circuit on the chip completes amplification, filtering and analog-to-digital conversion.

[0025] Output interface 10: It adopts a communication interface that supports the CAN FD protocol, with a transmission rate of up to 2Mbps, which meets the high-speed data transmission requirements of automotive electronic systems.

[0026] Installation method

[0027] The sensor is directly fixed to key nodes of the heat pump system, such as the high-pressure side (e.g., the outlet of the high-pressure liquid storage tank), the low-pressure side, or the inlet and outlet of the expansion valve, through a threaded interface 11 or a quick-connect structure, to achieve real-time data acquisition at a single point. It supports multi-node deployment (e.g., the inlet of the evaporator, the outlet of the compressor, etc.) to form a distributed monitoring network that covers the entire system operating conditions.

[0028] Collaborative Function Design

[0029] Superheat calculation: Based on synchronously collected temperature and pressure data, the refrigerant superheat is dynamically calculated, providing an accurate basis for adjusting the opening of the expansion valve and optimizing system energy efficiency.

[0030] Fault warning: When the pressure rises abnormally, the system determines whether there is a blockage or leak in the pipeline by combining temperature data, and triggers the system protection mechanism.

[0031] Energy efficiency optimization: The compressor speed is adjusted in real time by adjusting the saturation temperature-pressure relationship to avoid over-compression or under-compression and reduce system energy consumption.

[0032] High-voltage side operating condition monitoring

[0033] The sensor is installed at the outlet of the high-pressure liquid storage tank of the heat pump system through the threaded interface 11. The temperature probe 4 contacts the refrigerant pipeline, and the pressure diaphragm 6 senses the pressure in the high-pressure chamber. When the sensor detects that the pressure exceeds the threshold and the temperature does not rise synchronously, the data fusion algorithm determines that the pipeline may be blocked, triggers the system pressure relief protection, and avoids compressor overload.

[0034] Evaporator Frost Warning

[0035] A set of sensors is deployed at both the inlet and outlet of the evaporator. By synchronously collecting temperature and pressure data at both ends, the temperature difference and pressure difference are calculated. When an abnormal increase in temperature or pressure difference is detected, it is determined that the evaporator may be frosting, and the defrosting mode is started in advance to avoid a decrease in heating efficiency.

[0036] In summary, this utility model effectively solves the defects of traditional discrete sensors through integrated structural design and signal collaborative processing, improving the monitoring accuracy, energy efficiency and reliability of automotive heat pump systems, and has significant practical value and market application prospects.

[0037] The signal processing module, temperature sensor, and pressure sensor mentioned in this article are all general standard parts or components known to those skilled in the art. No modifications have been made to these devices. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods, so they will not be described in detail here.

[0038] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. An integrated temperature and pressure sensor for automotive heat pump systems, characterized in that: include: An integrated sensor housing (1) is provided, which contains a signal processing module (2), a temperature sensing unit (3) and a pressure sensing unit (5). The temperature probe (4) of the temperature sensing unit (3) and the pressure diaphragm (6) of the pressure sensing unit (5) form a dual-probe structure. The dual-probe structure is arranged in parallel at the front end of the integrated sensor housing (1) and shares the same medium contact surface. The side of the integrated sensor housing (1) is provided with an output interface (10) for outputting signals.

2. The integrated temperature and pressure sensor for an automotive heat pump system according to claim 1, characterized in that: A silicone shock-absorbing pad (9) is embedded at the connection between the integrated sensor housing (1) and the dual-probe structure.

3. The integrated temperature and pressure sensor for an automotive heat pump system according to claim 1, characterized in that: The signal processing module (2) includes an analog-to-digital converter, which is used to convert the analog signals of the temperature sensing unit (3) and the pressure sensing unit (5) into digital signals and output them through the output interface (10); the signal processing module (2) also includes a signal filtering circuit, which is used to filter the converted digital signals to improve the stability and anti-interference ability of the signals.

4. An integrated temperature and pressure sensor for an automotive heat pump system according to claim 1, characterized in that: The integrated sensor housing (1) has heat dissipation fins (12) on its surface and is filled with thermally conductive silicone grease inside.

5. An integrated temperature and pressure sensor for an automotive heat pump system according to claim 1, characterized in that: The integrated sensor housing (1) includes an upper housing (7) and a lower housing (8), which are connected by fine thread and sealed with an O-ring.

6. An integrated temperature and pressure sensor for an automotive heat pump system according to claim 5, characterized in that: The bottom of the lower housing (8) is provided with a threaded interface (11) for fixing to the high-pressure side, low-pressure side or expansion valve inlet and outlet of the automotive heat pump system.

7. An integrated temperature and pressure sensor for an automotive heat pump system according to claim 1, characterized in that: The integrated sensor housing (1) is made of high-temperature resistant aluminum alloy.

8. An integrated temperature and pressure sensor for an automotive heat pump system according to claim 1, characterized in that: The output interface (10) is a communication interface that supports the CAN FD protocol and has a transmission rate of 2Mbps.

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