Hall and eddy current integrated steering wheel angle sensor system

Abstract

The utility model relates to the technical field of automobile steering wheels, in particular to a Hall and eddy current integrated steering wheel angle sensor system, which comprises a steering wheel angle sensor device main body, and a circuit module is arranged in the steering wheel angle sensor device main body. A Hall angle sensing chip, an eddy current angle sensing chip and an eddy current coil are integrated on the circuit module, a wiring harness is connected to the circuit module, a lower shell is arranged on the steering wheel angle sensor device body, a magnet is installed in the lower shell, a driving gear is further arranged in the lower shell, a rotor is arranged in the driving gear, and a motor is arranged in the rotor. The driving gear is connected with a first driven gear and a second driven gear in a meshed mode. According to the Hall and eddy current integrated steering wheel angle sensor system, the current advanced eddy current sensing and mainstream Hall sensing technology is adopted, non-contact measurement of the angle of the steering wheel is achieved, and compared with the traditional contact measurement technology, abrasion is greatly improved, and the service life is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile steering wheel, concretely to a direction wheel angle sensor system of hall and eddy current integration. BACKGROUND

[0002] The direction wheel angle sensor is a device for detecting the rotation angle of the steering wheel of a vehicle, and plays an important role in modern vehicles, especially in vehicles equipped with advanced driving assistance systems such as electronic stability control systems, active steering systems, and lane keeping assistance systems.

[0003] In the field of existing electric main steering system EPS, the mainstream scheme is to use double hall sensor chips, which has the advantages of high precision and high reliability, but the corresponding disadvantage is that the hall sensor chip is easily disturbed by the electromagnetic field, while the other eddy current sensor chip scheme is almost not affected by electromagnetic interference, but will be affected by the metal close to the eddy current signal, especially the electromagnetic environment in the growing new energy vehicle is more severe than that in the fuel vehicle. However, there is currently a lack of a scheme that is less affected by electromagnetic interference in China, which is not conducive to the application of high reliability of vehicles. Therefore, a new type of direction wheel angle sensor system is needed. SUMMARY

[0004] The utility model aims at providing a kind of direction wheel angle sensor system of hall and eddy current integration, to solve the problem that the direction wheel angle sensor system of current market adopts hall sensor chip scheme and is easily disturbed by electromagnetic field, and adopts eddy current sensor chip scheme and is easily affected by metal eddy current coil output as described in the above background art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of direction wheel angle sensor system of hall and eddy current integration, including direction wheel angle sensor device main body, the circuit module is equipped in the direction wheel angle sensor device main body, and hall angle sensing chip, eddy current angle sensing chip and eddy current coil are integrated on circuit module, and wire harness is connected on circuit module, the lower shell is equipped on the direction wheel angle sensor device main body, and magnet is installed in the lower shell, the driving gear is also equipped in the lower shell, and rotor is equipped in the driving gear, and the first driven gear and the second driven gear are engagedly connected on the driving gear, the magnet, the driving gear, the first driven gear, the second driven gear and the hall angle sensing chip integrated on circuit module constitute hall sensing technology, the rotor and the eddy current coil and the eddy current angle sensing chip integrated on circuit module constitute eddy current sensing technology.

[0006] Preferably, the lower shell upper end fastening cover is provided with a rear shell, and a sealing ring is arranged between the rear shell and the lower shell.

[0007] Preferably, the rear shell is fastened with screws between the sealing ring, and O-rings are arranged between the rear shell and the lower shell and the rotor.

[0008] Preferably, the driving gear has a gear difference with the first driven gear and the second driven gear.

[0009] Preferably, the circuit module is further integrated with an MCU, a CAN transceiver, an EEPROM, a voltage stabilizing module and a power supply module, two Hall angle sensing chips are integrated on the circuit module, and the Hall angle sensing chips are connected with the MCU through SPI communication.

[0010] Preferably, the eddy current angle sensing chip on the circuit module is connected with the MCU through IIC communication, and the eddy current angle sensing chip is connected with the eddy current coil.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1. The Hall and eddy current integrated steering wheel angle sensor system adopts the current advanced eddy current sensing and mainstream Hall sensing technology, realizes non-contact measurement of steering wheel angle, and greatly improves wear and service life compared with traditional contact measurement technology.

[0013] 2. The Hall and eddy current integrated steering wheel angle sensor system is greatly improved in wear and service life through the redundant design of Hall and eddy current two schemes, guarantees high precision and high reliability, reduces electromagnetic field interference and metal influence on the eddy current coil, and guarantees high precision and high reliability.

[0014] 3. The Hall and eddy current integrated steering wheel angle sensor system adopts two gears with gear difference through the design of driving gear and driven gear, and realizes absolute positioning technology of angle through gear difference data.

[0015] 4. The Hall and eddy current integrated steering wheel angle sensor system collects original angle data of the eddy current angle sensing chip and the Hall sensing chip through the single-chip microcomputer, processes and compares the data, and sends absolute angle data through the CAN bus. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a wiring structure schematic view of the Hall and eddy current integrated steering wheel angle sensor system.

[0017] Figure 2 It is an exploded view of the Hall and eddy current integrated steering wheel angle sensor system.

[0018] Figure 3The utility model discloses a steering wheel angle sensor system of hall and eddy current integration's plan view.

[0019] In the drawing: 1, steering wheel angle sensor device main body; 2, lower shell; 3, sealing ring; 4, rear shell; 5, O ring; 6, driving gear; 7, first driven gear; 8, magnet; 9, screw; 10, circuit module; 11, wire harness; 12, second driven gear; 13, rotor. DETAILED DESCRIPTION

[0020] The technical scheme 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, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0021] Please refer to Figures 1-3The utility model provides a technical scheme: a kind of steering wheel angle sensor system integrated with Hall and eddy current, including steering wheel angle sensor device main body 1, circuit module 10 is equipped in steering wheel angle sensor device main body 1, and Hall angle sensing chip, eddy current angle sensing chip and eddy current coil are integrated on circuit module 10, and wire harness 11 is connected on circuit module 10, lower shell 2 is equipped on steering wheel angle sensor device main body 1, rear shell 4 is equipped in lower shell 2 upper end fastening cover, and a circle sealing ring 3 is equipped between rear shell 4 and lower shell 2, this structure is sealed between rear shell 4 and lower shell 2, makes steering wheel angle sensor device main body 1 install in a relatively sealed space, reach the effect of protection, and magnet 8 is installed in lower shell 2, main drive gear 6 is also equipped in lower shell 2, and rotor 13 is equipped in main drive gear 6, and first driven gear 7 and second driven gear 12 are engagedly connected on main drive gear 6, screw 9 is fastened between rear shell 4 and sealing ring 3, and O ring 5 is arranged between rear shell 4 and lower shell 2 and rotor 13, this structure sets up O ring 5 at rotor 13, so that O ring 5 does not affect the rotation of main drive gear 6, ensures the sealed installation of steering wheel angle sensor device main body 1, avoids gear exposure in external environment, prevents dust, water and other pollutants from entering gear meshing area, to protect gear from corrosion and damage, while can reduce the loss of lubricating oil, to prevent gear wear, magnet 8, main drive gear 6, first driven gear 7, second driven gear 12 and the Hall angle sensing chip integrated on circuit module 10 constitute Hall sensing technology, main drive gear 6 and first driven gear 7 and second driven gear 12 between all have gear difference, this structure sets up encoder on first driven gear 7 and second driven gear 12, by the cooperation of encoder and gear difference, encoder output signal is handled by proper electronic circuit, converts into digital signal for control system reading, so angle absolute positioning technology can be realized by gear difference data, rotor 13 and the eddy current coil and eddy current angle sensing chip integrated on circuit module 10 constitute eddy current sensing technology, MCU, CAN transceiver, EEPROM, voltage stabilizing module and power supply module (such as Figure 1The circuit module 10 is integrated with two Hall angle sensing chips, and the Hall angle sensing chip is connected with the MCU through SPI communication connection. This structure can receive the information of the Hall angle sensing chip and the eddy current angle sensing chip through the MCU, process the information, realize angle monitoring, and measure the angle through the Hall angle sensing chip, the magnet 8, the driving gear 6, the first driven gear 7, the second driven gear 12 and the circuit module 10. The angle non-contact measurement is realized. The EEPROM plays a role in data storage. The MCU collects the original angle data of the eddy current angle sensing chip and the Hall sensing chip, compares the data through data processing, and then sends the absolute angle data through the CAN transceiver to realize high-precision angle measurement. The voltage stabilizing module provides 3.3V and 5V direct current voltage respectively. The system is powered by a 12V direct current power supply. The eddy current angle sensing chip on the circuit module 10 is connected with the MCU through IIC communication connection, and the eddy current angle sensing chip is connected with the eddy current coil. When the current passes through the eddy current coil, an alternating magnetic field is generated, which makes the rotor 13 rotate, thereby realizing the rotation of the driving gear 6. The angle non-contact detection technology is greatly improved in wear and service life compared with the traditional contact measurement technology.

[0022] Working principle: when the Hall and eddy current integrated steering wheel angle sensor system is used, the MCU, the CAN transceiver, the EEPROM, the voltage stabilizing module, the power supply module, the Hall angle sensing chip, the eddy current angle sensing chip and the eddy current coil are integrated on the circuit module 10, so that the steering wheel angle sensor device main body 1 is sealed and installed through the cooperation of the lower shell 2 and the rear shell 4. The sealing ring 3 plays a sealing connection role for the lower shell 2 and the rear shell 4. The screw 9 plays a fastening role for the lower shell 2 and the rear shell 4. The O-ring 5 is also used for the sealing installation of the steering wheel angle sensor device main body 1. The O-ring 5 is also used for the sealing installation of the steering wheel angle sensor device main body 1. The circuit module 10 is connected to the power supply through the wire harness 11. When the steering wheel angle sensor device main body 1 works, the magnet 8 changes the position relative to the Hall angle sensing chip due to the rotation of the steering wheel, which changes the magnetic field strength and direction of the Hall element, thereby generating a changing Hall voltage. After amplification, filtering and other processing, the Hall voltage is converted into a digital signal for calculating the specific rotation angle of the steering wheel. At the same time, when the steering wheel rotates, the rotor 13 rotates together with the driving gear 6. The rotation of the driving gear 6 drives the first driven gear 7 and the second driven gear 12, and realizes the absolute positioning technology of the angle through the gear difference data. When the driving gear 6 rotates, the alternating magnetic field generated by the eddy current coil generates eddy current in the rotor 13. The impedance change detected by the receiving coil is converted into an electric signal. After processing, the angle information of the steering wheel can be obtained, thereby completing a series of work.

[0023] Although the utility model has been explained in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A Hall and electrovortex integrated steering wheel angle sensor system comprising a steering wheel angle sensor device body (1), characterized by: The steering wheel angle sensor device body (1) is provided with a circuit module (10), and the circuit module (10) is integrated with a Hall angle sensing chip, an eddy current angle sensing chip and an eddy current coil, and the circuit module (10) is connected with a wire harness (11), the steering wheel angle sensor device body (1) is provided with a lower shell (2), and the lower shell (2) is provided with a magnet (8), the lower shell (2) is also provided with a driving gear (6), and the driving gear (6) is provided with a rotor (13), and the driving gear (6) is engaged with a first driven gear (7) and a second driven gear (12), the magnet (8), the driving gear (6), the first driven gear (7), the second driven gear (12) and the Hall angle sensing chip integrated on the circuit module (10) constitute a Hall sensing technology, the rotor (13) and the eddy current coil and the eddy current angle sensing chip integrated on the circuit module (10) constitute an eddy current sensing technology.

2. A Hall and electrovortex integrated steering wheel angle sensor system according to claim 1, characterized in that: The upper end of the lower shell (2) is provided with a rear shell (4), and a sealing ring (3) is arranged between the rear shell (4) and the lower shell (2).

3. A Hall and electrovortex integrated steering wheel angle sensor system according to claim 2, characterized in that: The rear shell (4) and the sealing ring (3) are fastened by a screw (9), and O-rings (5) are arranged between the rear shell (4) and the lower shell (2) and the rotor (13).

4. A Hall and electrovortex integrated steering wheel angle sensor system according to claim 1, characterized in that: The driving gear (6) has a gear difference with the first driven gear (7) and the second driven gear (12).

5. A Hall and eddy current integrated steering wheel angle sensor system according to claim 1, characterized in that: The circuit module (10) is also integrated with an MCU, a CAN transceiver, an EEPROM, a voltage stabilizing module and a power supply module, the circuit module (10) is integrated with two Hall angle sensing chips, and the Hall angle sensing chip and the MCU are connected by SPI communication.

6. A Hall and electrovortex integrated steering wheel angle sensor system according to claim 5, characterized in that: The eddy current angle sensing chip on the circuit module (10) and the MCU are connected by IIC communication, and the eddy current angle sensing chip and the eddy current coil.

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