Wide-range high-precision absolute pressure sensor for vehicle

Abstract

The utility model discloses a wide-range high-precision absolute pressure sensor for a vehicle, which comprises an upper shell, a lower shell, a pressure conduction device, a temperature compensation device and a pressure sensitive device, and the upper shell and the lower shell are used as mounting bases for connecting and fixing other parts and have good sealing performance and durability. The internal elements can be protected from being affected by the external environment, the pressure conduction device is used for directly making contact with pressure and accurately transmitting the pressure to the pressure sensitive device, the temperature compensation device is used for detecting the internal elements in real time, signals can be output in time for compensation according to temperature changes, the measurement precision is improved, and the measurement cost is reduced. The pressure sensitive device serves as a core device and is used for converting received external pressure into an electric signal and amplifying the electric signal, so that the signal precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure sensor, concretely is a kind of wide range high-precision absolute pressure sensor for vehicle. BACKGROUND

[0002] Vehicle pressure sensor plays a vital role in modern automobile, mainly used to monitor and control the pressure parameters of each system of vehicle, such as tire pressure, fuel pressure, intake manifold pressure and brake system pressure, etc., by real-time acquisition of these data, sensor can provide key information for engine management system, safety system and driving assistance system, so as to optimize vehicle performance, improve fuel efficiency and enhance safety.

[0003] However, vehicle pressure sensor still has some defects in practical application, due to complex working environment, sensor is easily affected by temperature, vibration and electromagnetic interference, leading to measurement accuracy decline or failure, and long-term exposure to harsh conditions may cause material aging or damage, affecting the reliability and life of sensor, therefore, the utility model provides a kind of wide range high-precision absolute pressure sensor for vehicle to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of wide range high-precision absolute pressure sensor for vehicle to solve the problems raised in the above background.

[0005] In order to solve the above technical problem, the utility model provides the following technical scheme:

[0006] A kind of wide range high-precision absolute pressure sensor for vehicle, pressure sensor includes upper shell, lower shell, pressure transmission device, temperature compensation device and pressure sensitive device, upper shell, lower shell, pressure transmission device, temperature compensation device and pressure sensitive device are sequentially arranged from top to bottom, upper shell and lower shell are fastened connection, pressure transmission device and upper shell are movably connected, pressure transmission device and pressure sensitive device contact, temperature compensation device and pressure sensitive device are fastened connection, temperature compensation device and pressure sensitive device are electrically connected.

[0007] Upper shell and lower shell are used as installation base, for connecting and fixing other components, and have good sealing property and durability, can protect internal elements from external environment, pressure transmission device is used for direct pressure contact, and accurately transmits pressure to pressure sensitive device, temperature compensation device is used for real-time detection of internal elements, can output signal in time for compensation according to the change of temperature, improve measurement accuracy, pressure sensitive device is used as core device, for converting external pressure into electrical signal, and amplifying electrical signal, improve signal accuracy.

[0008] Further, the lower shell is provided with a thread, which is located at the end of the lower shell away from the upper shell.

[0009] The lower shell is provided with a thread, which facilitates the installation of the lower shell on the device in the vehicle that needs to be pressure detected, and facilitates the subsequent maintenance of the pressure sensor.

[0010] Further, the pressure conducting device includes a metal pressing sheet, a conducting spring, and a connecting sheet, the metal pressing sheet is movably connected with the upper shell, one end of the metal pressing sheet is fixedly connected with the conducting spring, and the other end of the conducting spring is fixedly connected with the connecting sheet.

[0011] The metal pressing sheet is used to directly contact the pressure source and transmit the pressure to the conducting spring, the conducting spring transmits the pressure from the metal pressing sheet to the connecting sheet, and under high pressure or impact conditions, the conducting spring can also buffer and disperse the pressure to protect the sensitive element from being damaged, and the connecting sheet is used to contact the pressure sensitive device and transmit the pressure to the pressure sensitive device.

[0012] Further, the temperature compensation device includes a temperature sensor and a support column, the temperature sensor is fixedly connected with the support column, the temperature sensor is electrically connected with the pressure sensitive device, the support column is fixedly connected with the pressure sensitive device, and the support column is located at the center of the conducting spring.

[0013] The temperature sensor is used to detect the internal temperature in real time, and through the electrical connection with the pressure sensitive device, the measured temperature is fed back to the pressure sensitive device in time for temperature compensation, which improves the measurement accuracy, the support column serves as a mounting base for connecting and fixing other components and does not affect the measurement process, and the temperature sensor in the device adopts a DHT11 type sensor.

[0014] Further, the pressure sensitive device includes a diaphragm and a signal processing center, the diaphragm is sleeved outside the outer circle of the support column, the diaphragm is connected with the lower shell, the signal processing center is fixedly connected with the support column, and the temperature sensor and the diaphragm are electrically connected with the signal processing center.

[0015] The diaphragm is the most important component in the device, which is used to perceive the external pressure and convert it into a measurable signal, when the external pressure acts on the diaphragm, the diaphragm will deform slightly, then convert into an electrical signal, which is then measured and recorded, realizing the accurate measurement of pressure, the signal processing center is an electrical element, which is used to receive the electrical signals transmitted by each component and process and amplify them for transmission to other devices.

[0016] Further, the connecting sheet is provided with contacts, and the contacts are evenly arranged under the connecting sheet.

[0017] The contact points are used to contact with the diaphragm, the contact area is different when the pressure is different, the deformation of the diaphragm is also different, the wide range of the sensor is realized, and the several contact points are uniformly arranged under the connecting sheet, so that the measurement accuracy is higher.

[0018] Further, the upper shell and the lower shell are made of corrosion-resistant insulating material, and the diaphragm is made of elastic metal material.

[0019] The upper shell and the lower shell are made of corrosion-resistant insulating material, which can effectively resist the corrosion of chemical substances, moisture and other corrosive media in the environment, thereby prolonging the service life of the sensor, preventing electrical interference and leakage phenomenon, ensuring the stability and accuracy of the sensor signal, and being suitable for various complex working conditions.

[0020] Compared with the prior art, the utility model has the advantages that the temperature compensation device is arranged, the internal elements are detected in real time, the signal can be compensated in time according to the change of temperature, the measurement accuracy is improved, the conduction spring is arranged, the conduction spring can also buffer and disperse pressure under high pressure or impact condition, the sensitive element is protected from damage, the contact points and the diaphragm are arranged to contact, the contact area is different when the pressure is different, the deformation of the diaphragm is also different, the wide range of the sensor is realized, and the several contact points are uniformly arranged under the connecting sheet, so that the measurement accuracy is higher. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the utility model and constitute a part of the specification, are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model.In the drawings:

[0022] Figure 1 It is the overall cross-sectional structure schematic diagram of the utility model;

[0023] Figure 2 It is the lower shell structure schematic diagram of the utility model;

[0024] Figure 3 It is the pressure conduction device structure schematic diagram of the utility model;

[0025] Figure 4 It is the pressure sensitive device structure schematic diagram of the utility model.

[0026] In the figure: 1 - upper shell, 2 - lower shell, 3 - pressure conducting device, 4 - temperature compensation device, 5 - pressure sensitive device, 21 - thread, 31 - metal pressure plate, 32 - conducting spring, 33 - connecting plate, 41 - temperature sensor, 42 - support column, 51 - diaphragm, 52 - signal processing center, 331 - contact. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0028] Please refer to Figures 1-4 The utility model provides technical schemes:

[0029] As Figure 1 shown, a wide-range high-precision absolute pressure sensor for vehicles, the pressure sensor includes upper shell 1, lower shell 2, pressure conducting device 3, temperature compensation device 4 and pressure sensitive device 5, upper shell 1, lower shell 2, pressure conducting device 3, temperature compensation device 4 and pressure sensitive device 5 are arranged in turn from top to bottom, upper shell 1 and lower shell 2 are fastened and connected, pressure conducting device 3 and upper shell 1 are movably connected, pressure conducting device 3 and pressure sensitive device 5 are in contact, temperature compensation device 4 and pressure sensitive device 5 are fastened and connected, temperature compensation device 4 and pressure sensitive device 5 are electrically connected.

[0030] Upper shell 1 and lower shell 2 are used as installation bases, are used for connecting and fixing other components, and have good sealing property and durability, can protect internal elements from the influence of external environment, pressure conducting device 3 is used for directly contacting pressure and accurately transmitting the size of pressure to pressure sensitive device 5, temperature compensation device 4 is used for detecting internal elements in real time, can output signals in time for compensation according to the change of temperature, improves the measurement accuracy, pressure sensitive device 5 is used as a core device, is used for converting the external pressure received into an electric signal, and amplifies the electric signal, improves the signal accuracy.

[0031] As Figure 2 shown, the lower shell 2 is provided with a thread 21, and the thread 21 is located at the end of the lower shell 2 away from the upper shell 1.

[0032] The thread 21 is arranged on the lower shell 2, which facilitates the installation of the lower shell 2 on the device in the vehicle that needs to be pressure detected, and facilitates the subsequent maintenance of the pressure sensor.

[0033] As Figures 2-3As shown, the pressure transmission device 3 includes a metal pressure plate 31, a transmission spring 32, and a connecting plate 33. The metal pressure plate 31 is movably connected to the upper housing 1. The metal pressure plate 31 and one end of the transmission spring 32 are fastened together. The end of the transmission spring 32 away from the metal pressure plate 31 is fastened together with the connecting plate 33.

[0034] The metal pressure plate 31 is used to directly contact the pressure source and transmit the pressure to the conduction spring 32. The conduction spring 32 will transmit the pressure from the metal pressure plate 31 to the connecting plate 33. Under high pressure or impact conditions, the conduction spring 32 can also buffer and disperse the pressure to protect the sensitive element from damage. The connecting plate 33 is used to contact the pressure sensitive device 5 and transmit the pressure to the pressure sensitive device 5.

[0035] like Figure 4 As shown, the temperature compensation device 4 includes a temperature sensor 41 and a support column 42. The temperature sensor 41 and the support column 42 are fastened together. The temperature sensor 41 is electrically connected to the pressure sensing device 5. The support column 42 and the pressure sensing device 5 are fastened together. The support column 42 is located at the center of the conductive spring 32.

[0036] Temperature sensor 41 is used to detect the internal temperature in real time, and through electrical connection with pressure sensing device 5, it promptly feeds back the measured temperature to pressure sensing device 5 for temperature compensation, thereby improving measurement accuracy. Support column 42 serves as the mounting base for connecting and fixing other components, and does not affect the measurement process. The temperature sensor 41 in this device adopts the DHT11 model sensor.

[0037] like Figure 4 As shown, the pressure-sensitive device 5 includes a diaphragm 51 and a signal processing center 52. The diaphragm 51 is sleeved on the outer ring of the support column 42. The diaphragm 51 is connected to the lower housing 2. The signal processing center 52 is fastened to the support column 42. The temperature sensor 41 and the diaphragm 51 are both electrically connected to the signal processing center 52.

[0038] The diaphragm 51, as the most important component in the device, is used to sense external pressure and convert it into a measurable signal. When external pressure is applied to the diaphragm 51, the diaphragm 51 will undergo a slight deformation, which is then converted into an electrical signal, and then measured and recorded to achieve accurate pressure measurement. The signal processing center 52, as an electrical component, is used to receive the electrical signals transmitted by various components, process and amplify them, and transmit them to other devices.

[0039] like Figures 3-4 As shown, the connecting piece 33 is provided with a number of contacts 331, which are evenly arranged around the bottom of the connecting piece 33.

[0040] The contact points 331 are used to contact the diaphragm 51, when the pressure size is different, the contact area is also different, the deformation of the diaphragm 51 is also different, the wide range of the sensor is realized, and a plurality of contact points 331 are uniformly arranged below the connecting piece 33, so that the measurement accuracy is higher.

[0041] As shown in Figures 1-4 The upper shell 1 and the lower shell 2 are made of corrosion-resistant insulating materials, and the diaphragm 51 is made of elastic metal material.

[0042] The upper shell 1 and the lower shell 2 are made of corrosion-resistant insulating materials, and the diaphragm 51 is made of elastic metal material.

[0043] The working principle of the utility model is: the lower shell 2 is installed on the device to be measured through the thread 21, the upper shell 1 is directed to the direction of pressure to be detected, when the pressure contacts the metal pressure sheet 31, the metal pressure sheet 31 is compressed, the metal pressure sheet 31 transmits the pressure to the conducting spring 32, the conducting spring 32 applies pressure to the connecting piece 33, the contact points 331 on the connecting piece 33 make the diaphragm 51 produce slight deformation, the diaphragm 51 converts the deformation into an electric signal and transmits the electric signal to the signal processing center 52, the signal processing center 52 processes and amplifies the electric signal, and the measurement result of the pressure is obtained, during the measurement process, the temperature sensor 41 detects the real-time temperature inside, the measured temperature is fed back to the pressure sensitive device 5 in time, temperature compensation is carried out, and the measurement accuracy is improved.

Claims

1. A wide-range, high-precision absolute pressure sensor for vehicles, characterized in that: The pressure sensor comprises an upper shell (1), a lower shell (2), a pressure conducting device (3), a temperature compensation device (4) and a pressure sensitive device (5), which are arranged in sequence from top to bottom, the upper shell (1) and the lower shell (2) are fastened and connected, the pressure conducting device (3) and the upper shell (1) are movably connected, the pressure conducting device (3) and the pressure sensitive device (5) are in contact, the temperature compensation device (4) and the pressure sensitive device (5) are fastened and connected, and the temperature compensation device (4) and the pressure sensitive device (5) are electrically connected.

2. A wide-range high-precision absolute pressure sensor for vehicles according to claim 1, characterized in that: The lower shell (2) is provided with a thread (21) at one end away from the upper shell (1).

3. A wide-range high-precision absolute pressure sensor for vehicles according to claim 1, characterized in that: The pressure conducting device (3) comprises a metal pressing sheet (31), a conducting spring (32) and a connecting sheet (33), the metal pressing sheet (31) and the upper shell (1) are movably connected, the metal pressing sheet (31) and the conducting spring (32) are fastened at one end, and the other end of the conducting spring (32) away from the metal pressing sheet (31) is fastened with the connecting sheet (33).

4. A wide-range high-precision absolute pressure sensor for vehicles according to claim 3, characterized in that: The temperature compensation device (4) comprises a temperature sensor (41) and a supporting column (42), the temperature sensor (41) and the supporting column (42) are fastened and connected, the temperature sensor (41) and the pressure sensitive device (5) are electrically connected, the supporting column (42) and the pressure sensitive device (5) are fastened and connected, and the supporting column (42) is located at the center of the conducting spring (32).

5. A wide range high accuracy absolute pressure sensor for automotive applications as claimed in claim 4 wherein: The pressure sensitive device (5) comprises a diaphragm (51) and a signal processing center (52), the diaphragm (51) is sleeved outside the supporting column (42), the diaphragm (51) is connected with the lower shell (2), the signal processing center (52) is fastened and connected with the supporting column (42), and the temperature sensor (41) and the diaphragm (51) are electrically connected with the signal processing center (52).

6. A wide-range high-precision absolute pressure sensor for vehicles according to claim 3, characterized in that: The connecting sheet (33) is provided with a contact (331), and a plurality of contact points (331) are uniformly arranged below the connecting sheet (33).

7. A wide range high accuracy absolute pressure sensor for automotive use according to claim 5, characterized in that: The upper shell (1) and the lower shell (2) are made of corrosion-resistant insulating material, and the diaphragm (51) is made of elastic metal material.

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