Automobile eddy current dual-redundancy Hall sensor

Abstract

The utility model discloses an automobile eddy current dual-redundancy Hall sensor and a working method thereof in the field of automobile rotor angle detection and hovercar paddle position detection, and the sensor comprises a housing which is annular, the housing is provided with a mounting cavity, the mounting cavity is internally provided with an annular circuit board, the circuit board is connected with a wiring harness assembly, and the wiring harness assembly is connected with the housing. A sealing glue layer is arranged above the circuit board in the shell mounting cavity, the lower side of the shell is provided with a downward extending cylinder which extends downwards, a Hall sensor is arranged in the downward extending cylinder, and the Hall sensor is correspondingly connected with the circuit board. According to the utility model, through the dual-redundancy design, the eddy current sensor can reach ASIC-D at most; the Hall sensor is integrated into the circuit, so that the space occupied by the arrangement of the two sensors can be effectively reduced, and the weight is reduced.

Description

Technical Field

[0001] The utility model belongs to the fields of automotive rotor angle detection and flying vehicle blade position detection, and particularly relates to an automotive eddy current dual-redundancy Hall sensor. Background Art

[0002] In the prior art, an eddy current sensor can measure the distance between a measured metal conductor and the probe surface non-contact, with high linearity and high resolution both statically and dynamically. It is a non-contact linear metering tool and is often used for long-term real-time monitoring of parameters such as shaft displacement, shaft vibration, and shaft speed of rotating machinery.

[0003] Currently, the disadvantages of automotive eddy current sensors used for automotive rotor angle detection and flying vehicle blade position detection are: complex structure, excessive occupied space for the arrangement of two sensors, and too heavy weight.

[0004] In the eddy current dual-redundancy design of the present utility model, the circuits and magnetic paths of the two eddy currents are independent of each other, so as to achieve the function of redundant detection of rotor angle, rotational speed, and rotation direction. Two signal processing chips are selected, and through the dual-redundancy design, the eddy current sensor can reach ASIC-D at most; by integrating the Hall sensor into the circuit, the occupied space for the arrangement of the two sensors can be effectively reduced, and the weight can be reduced. Summary of the Utility Model

[0005] One of the purposes of the present utility model is to provide an automotive eddy current dual-redundancy Hall sensor, which can reach ASIC-D at most through the dual-redundancy design; by integrating the Hall sensor into the circuit, the occupied space for the arrangement of the two sensors can be effectively reduced, and the weight can be reduced.

[0006] The purpose of the present utility model is realized as follows: an automotive eddy current dual-redundancy Hall sensor includes a housing. The housing is annular, and an installation cavity is provided on the housing. An annular circuit board is arranged in the installation cavity. The circuit board is connected to a wiring harness assembly. A sealing glue layer is provided above the circuit board in the installation cavity of the housing. A downward-extending lower extension cylinder is provided on the lower side of the housing. A Hall sensor is arranged inside the lower extension cylinder, and the Hall sensor is correspondingly connected to the circuit board.

[0007] The circuit board of the present utility model is provided with a toroidal coil. When the rotor passes through the central hole of the housing, the magnetic field changes. The circuit board is provided with a convex part, and the housing matches the circuit board. The eddy current dual-redundancy Hall sensor has the following functions in terms of technology and structure: First, the eddy current, through the wire harness base and the mating assembly, plays an assembly and sealing effect. During installation, it is fixed by four bolts passing through the mounting ears. Second, the dual-redundancy circuit and magnetic circuit design enable the eddy current sensor to reach ASIC-D at most. Finally, the dual-redundancy eddy current sensor and the Hall sensor are structurally integrated, and the Hall sensor is supported and fixed by a plastic bracket, thereby simultaneously realizing the high-precision detection functions of the angle, rotation speed, rotation direction of the automotive rotor, and the position of the propeller blade of the flying car.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows: First, through the dual-redundancy design, the eddy current sensor can reach ASIC-D at most. Second, by integrating the Hall sensor into the circuit, the occupied space of the arrangement of the two sensors can be effectively reduced, and the weight can be reduced. Third, through the plastic bracket, the Hall sensor can be fixed and supported.

[0009] As a further improvement of the present utility model, the housing includes a toroidal lower support plate. An inner baffle and an outer baffle are respectively vertically arranged on the inner side and the outer side of the lower support plate. The circuit board is arranged on the lower support plate, and the inner baffle and the outer baffle are respectively arranged corresponding to the inner and outer sides of the circuit board. The sealant layer is arranged corresponding to the heights of the inner baffle and the outer baffle.

[0010] As a further improvement of the present utility model, each wire harness of the wire harness assembly is soldered and fixed to the circuit board. A sleeve-shaped wire harness base is arranged on the outer periphery of the lower end of each wire harness of the wire harness assembly, and the wire harness base is arranged upward through the sealant layer. The wire harness base is arranged on the upper side of the circuit board and fixes each wire harness of the wire harness assembly. A plurality of positioning holes through which each wire harness can pass are formed on the wire harness base, and each positioning hole positions the wire harness.

[0011] As a further improvement of the present utility model, a plurality of positioning posts are vertically arranged on the lower support plate, and each positioning post passes through the circuit board upward and is thermally riveted and fixed to the circuit board. The housing is fixed to the circuit board.

[0012] As a further improvement of the present utility model, a plurality of mounting ears are arranged on the outer periphery of the housing at intervals in the circumferential direction, and a bushing is arranged on the inner wall of the mounting hole of the mounting ear. The bolt passes through the mounting ear to fix the sensor.

[0013] In order to install and fix the Hall sensor, a plastic bracket for fixing the Hall sensor is arranged in the lower extension cylinder.

[0014] In order to fix the wire harness assembly, a cable tie is arranged on the wire harness assembly. The wire harness assembly is bundled and fixed by the cable tie.

[0015] As a further improvement of the present utility model, the circuit board is a PCB circuit board, on which a TX transmitting coil and an RX receiving coil are etched. The TX transmitting coil and the RX receiving coil are distributed around the circuit board. At least one signal processing chip is integrated on the PCB circuit board. The metal target wheel is correspondingly arranged with the central hole of the annular housing. Two signal processing chips and a Hall sensor are integrated on the PCB circuit board. The structures and functions of the sensors are integrated into one body. The metal target wheel is located at a position corresponding to the central hole of the housing of the automotive eddy current dual-redundancy Hall sensor. When the metal target wheel rotates, the angle or displacement can be detected.

[0016] The second object of the present utility model is to provide a working method of an automotive eddy current dual-redundancy Hall sensor, which can obtain a specific output signal corresponding to the actual position of the target wheel to be detected through the calculation of the chip. By using the principle of eddy current effect and designing a reasonable coil system and metal target wheel, the detection of angle or displacement can be realized.

[0017] The object of the present utility model is realized as follows: A working method of an automotive eddy current dual-redundancy Hall sensor includes the following steps: The signal processing chip provides an AC voltage source to the TX transmitting coil on the PCB circuit board. The TX transmitting coil generates a high-frequency alternating electromagnetic field of 3.45 - 3.55 MHz, which acts on the surface of the metal target wheel to form an eddy current effect. When the metal target wheel rotates, the RX receiving coil receives the magnetic field change and forms a change in the high and low values of the voltage. This signal change is calculated and decoded by the signal processing chip to obtain a specific output signal corresponding to the actual position of the metal target wheel.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: Based on the eddy current effect, the TX coil etched on the built-in PCB of the present utility model needs to be provided with an AC voltage source by the chip to generate a high-frequency alternating electromagnetic field of about 3.5 MHz, which acts on the surface of the metal target wheel to form an eddy current effect. When the target wheel rotates, the RX coil will receive the magnetic field change and form a change in the high and low values of the voltage. This signal change can obtain a specific output signal corresponding to the actual position of the target wheel after being decoded by the chip (extracting the amplitude envelope). The Hall position sensor realizes the switching of the output signal of high and low voltages by sensing the target inductor: when it is far from the target inductor, the output signal is a high voltage; when it is close to the target inductor, the output signal is a low voltage.

[0019] The motor position detection sensor of the present utility model uses the principle of eddy current effect. By designing a reasonable coil system and metal target wheel, the detection of angle or displacement can be realized. Therefore, compared with the sensors based on Hall effect and magnetoresistive principle, the eddy current effect does not require the use of magnets. It can not only replace in terms of function, but also has the ability to resist stray magnetic field interference, and better meets the requirements of new energy vehicles for high-frequency magnetic field anti-interference ability.

[0020] As a further improvement of the present utility model, the frequency of the high-frequency alternating electromagnetic field is 3.5 MHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structure diagram of the present utility model.

[0022] Figure 2 It is a bottom structure diagram of the present utility model.

[0023] Figure 3 It is a schematic structural diagram of the housing and the circuit board.

[0024] Figure 4 It is a schematic structural diagram of the housing.

[0025] Figure 5 It is a schematic structural diagram of the Hall sensor and the plastic bracket.

[0026] Figure 6 It is a schematic structural diagram of the circuit board.

[0027] Figure 7 It is a schematic structural diagram of the metal target wheel.

[0028] Figure 8 It is a working principle diagram of the signal processing chip.

[0029] Figure 9 It is the output signal of the eddy current sensor.

[0030] Wherein, 1 housing, 101 lower support plate, 102 inner baffle, 103 outer baffle, 1a lower extension cylinder, 2 installation cavity, 3 circuit board, 4 wire harness assembly, 4a wire harness, 5 sealant layer, 6 Hall sensor, 7 wire harness base, 8 positioning post, 9 installation ear, 10 bushing, 11 plastic bracket, 12 metal target wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] As Figures 1-9 shown, a kind of automotive eddy current dual-redundancy Hall sensor of the present utility model includes a housing 1. The housing 1 is annular. An installation cavity 2 is provided on the housing 1. An annular circuit board 3 is arranged in the installation cavity 2. The circuit board 3 is connected to a wire harness assembly 4. A sealant layer 5 is provided above the circuit board 3 in the installation cavity 2 of the housing 1. A downward extension cylinder 1a is provided on the lower side of the housing 1. A Hall sensor 6 is arranged inside the downward extension cylinder 1a. The Hall sensor 6 is correspondingly connected to the circuit board 3. In order to install and fix the Hall sensor 6, a plastic bracket 11 for fixing the Hall sensor 6 is arranged inside the downward extension cylinder 1a.

[0032] The housing 1 includes an annular lower support plate 101. An inner baffle 102 and an outer baffle 103 are vertically arranged on the inner side and the outer side of the lower support plate 101 respectively. The circuit board 3 is arranged on the lower support plate 101, and the inner baffle 102 and the outer baffle 103 are arranged corresponding to the inner and outer sides of the circuit board 3 respectively. The sealant layer 5 is arranged corresponding to the heights of the inner baffle 102 and the outer baffle 103. A plurality of positioning posts 8 are vertically arranged on the lower support plate 101. Each positioning post 8 passes upward through the circuit board 3 and is thermally riveted and fixed to the circuit board 3. The housing 1 is fixed to the circuit board 3.

[0033] Each wire harness 4a of the wire harness assembly 4 is soldered and fixed to the circuit board 3. A sleeve-shaped wire harness base 7 is arranged on the outer periphery of the lower end of each wire harness 4a of the wire harness assembly 4. The wire harness base 7 passes upward through the sealant layer 5. The wire harness base 7 is arranged on the upper side of the circuit board 3 and fixes each wire harness 4a of the wire harness assembly 4. A plurality of positioning holes through which each wire harness can pass are formed on the wire harness base 7, and each positioning hole positions the wire harness. In order to fix the wire harness assembly 4, a cable tie is provided on the wire harness assembly 4. The wire harness assembly 4 is bundled and fixed by the cable tie.

[0034] A plurality of mounting ears 9 are arranged on the outer periphery of the housing 1 at intervals in the circumferential direction. A bushing 10 is arranged on the inner wall of the mounting hole of the mounting ear 9. Bolts pass through the mounting ears 9 to fix the sensor.

[0035] The circuit board 3 is a PCB circuit board. A TX transmitting coil and an RX receiving coil are etched on the PCB circuit board. The TX transmitting coil and the RX receiving coil are distributed in a surrounding manner on the circuit board 3. At least one signal processing chip is integrated on the PCB circuit board. The metal target wheel 12 is arranged corresponding to the central hole of the annular housing 1.

[0036] An annular coil is provided on the circuit board 3 of the present utility model. When the rotor passes through the central hole of the housing 1, the magnetic field changes; a convex portion is provided on the circuit board 3, and the housing 1 is matched with the circuit board 3; the eddy current dual-redundancy Hall sensor 6 has the following functions in terms of technology and structure: First, the eddy current, in cooperation with the assembly through the wire harness base 7, achieves the assembly and sealing effects, and four bolts pass through the mounting ears 9 during installation to play a fixing role; Second, the dual-redundancy circuit and magnetic circuit design enable the eddy current sensor to reach ASIC-D at most; Finally, the dual-redundancy eddy current sensor and the Hall sensor 6 are structurally integrated, and the Hall sensor 6 is supported and fixed through the plastic bracket 11, so as to simultaneously realize the high-precision detection functions of the angle, rotation speed, rotation direction of the automotive rotor and the position of the flying vehicle blade. The advantages of the present utility model are as follows: First, the eddy current sensor can reach ASIC-D at most through the dual-redundancy design; Second, by integrating the Hall sensor 6 into the circuit, the occupied space of the arrangement of the two sensors can be effectively reduced, and the weight can be reduced; Third, through the plastic bracket 11, the Hall sensor 6 can be fixed and supported.

[0037] The present invention discloses an operating method for an automotive eddy-current dual-redundant Hall effect sensor, comprising the following steps: a signal processing chip provides an AC voltage source to a TX transmitting coil on a PCB circuit board. The TX transmitting coil generates a high-frequency alternating electromagnetic field of 3.45-3.55 MHz, which acts on the surface of a metal target wheel 12 to form an eddy current effect. When the metal target wheel 12 rotates, the RX receiving coil receives the magnetic field changes, causing voltage fluctuations. This signal change is calculated and decoded by the signal processing chip to obtain a specific output signal corresponding to the actual position of the metal target wheel. The frequency of the high-frequency alternating electromagnetic field is 3.5 MHz.

[0038] This device utilizes the eddy current effect. The TX coil etched on the built-in PCB requires an AC voltage source from the chip, generating a high-frequency alternating electromagnetic field of approximately 3.5MHz. This field acts on the metal surface of the target wheel, creating an eddy current effect. As the target wheel rotates, the RX coil receives the magnetic field changes, causing voltage fluctuations. This signal is decoded by the chip (by extracting the amplitude envelope) to generate a specific output signal corresponding to the actual position of the target wheel. The Hall effect position sensor senses the target sensor and switches the output signal between high and low voltages via the chip: when away from the target sensor, the output signal is high; when close to the target sensor, the output signal is low.

[0039] Due to its flexible design, the sensor can be designed with different coil systems, matched with different metal target wheels or sliders, to meet different angle or displacement measurement ranges, thus realizing various sensor applications in automobiles, such as motor position (drive motor, hybrid transmission motor, rotor motor, one-box motor, EMB motor, etc.), seat position, throttle position, steering wheel torque angle, electronic pedal, long-stroke linear displacement, etc.

[0040] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, technicians in this field can make some substitutions and deformations of some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. An automotive eddy current dual-redundant Hall sensor, comprising a housing, characterized in that, The housing is annular, and an installation cavity is formed in the housing. An annular circuit board is arranged in the installation cavity. The circuit board is connected to a wire harness assembly. A sealing glue layer is arranged above the circuit board in the installation cavity of the housing. A downwardly extending lower extension cylinder is arranged on the lower side of the housing. A Hall sensor is arranged inside the lower extension cylinder, and the Hall sensor is correspondingly connected to the circuit board.

2. The automotive eddy current dual-redundancy Hall sensor according to claim 1, wherein The housing includes an annular lower support plate. An inner baffle and an outer baffle are respectively and vertically arranged on the inner side and the outer side of the lower support plate. The circuit board is arranged on the lower support plate, and the inner baffle and the outer baffle are respectively arranged corresponding to the inner and outer sides of the circuit board.

3. The automotive eddy current dual-redundancy Hall sensor according to claim 2, characterized in that, Each wire of the wire harness assembly is soldered and fixed to the circuit board. A sleeve-shaped wire harness base is arranged on the outer periphery of the lower end of each wire of the wire harness assembly, and the wire harness base is arranged upward through the sealing glue layer.

4. An automotive eddy current dual-redundancy Hall sensor according to claim 2 or 3, characterized in that, A plurality of positioning columns are vertically arranged on the lower support plate, and each positioning column passes upward through the circuit board and is thermally riveted and fixed to the circuit board.

5. A vehicle eddy current dual-redundancy Hall sensor according to any one of claims 1-3, characterized in that, A plurality of mounting ears are arranged on the outer periphery of the housing at intervals in the circumferential direction, and a bushing is arranged on the inner wall of the mounting hole of the mounting ear.

6. A kind of automotive eddy current dual-redundancy Hall sensor according to any one of claims 1-3, characterized in that, A plastic bracket for fixing the Hall sensor is arranged inside the lower extension cylinder.

7. A vehicle eddy current dual-redundancy Hall sensor according to any one of claims 1-3, characterized in that, A cable tie is arranged on the wire harness assembly.

8. A vehicle eddy current dual-redundancy Hall sensor according to any one of claims 1-3, characterized in that, The circuit board is a PCB circuit board. A TX transmitting coil and an RX receiving coil are etched on the PCB circuit board. The TX transmitting coil and the RX receiving coil are distributed in a surrounding manner on the circuit board. At least one signal processing chip is integrated on the PCB circuit board. The metal target wheel is arranged corresponding to the central hole of the annular housing.

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