Vehicle steering system and pure electric sanitation vehicle

Abstract

The present invention relates to a vehicle steering system and a pure electric sanitation vehicle. The pure electric sanitation vehicle includes a steering system comprising a steering wheel, a steering wheel shaft, an angle sensor, and an electromagnetic resistance device. The electromagnetic resistance device comprises an electromagnetic coil and a magnetic member fixed to the steering wheel shaft. When the electromagnetic coil is energized, it attracts a corresponding magnetic pole of the magnetic member. The electromagnetic coil and the corresponding magnetic pole are arranged radially along the steering wheel shaft. An electromagnetic resistance controller is used to control the electromagnetic coil to energize and attract the corresponding magnetic member when the vehicle speed exceeds a set value v and the steering wheel angle α exceeds a set value. The electromagnetic resistance controller can control the electromagnetic coil to generate resistance on the steering wheel shaft, reduce the reciprocating swing angle of the steering wheel, improve the stability of the steering wheel, and solve the current problem of poor steering wheel stability.

Description

Technical Field

[0001] The invention relates to a vehicle steering system and a pure electric sanitation vehicle. Background Art

[0002] The steering system is used to maintain or change the direction of a vehicle's travel. It ensures a coordinated steering angle between the steering wheels during cornering. All wheels should rotate about the same instantaneous steering center, and no wheel should slip. A normal steering trapezoidal linkage structure should meet this requirement, but it's not fully met in actual vehicles. Consequently, the steering trapezoidal linkage system is optimized, typically to achieve a nearly concentric motion relationship between the inner and outer steering wheels within a typical steering angle range (15° to 25° for the inner wheel). Traditional automotive power steering systems, due to their fixed transmission ratios, struggle to adapt to the varying reaction forces of the vehicle's steering system at high and low speeds. This results in difficult low-speed steering and insufficient steering resistance at high speeds. Currently, electronic power steering (EPS), hydraulic power steering (HPS), and electro-hydraulic power steering (EHPS) are commonly used. Heavy-duty vehicles such as 18-ton electric sanitation commercial vehicles, buses, and trucks often utilize traditional mechanical recirculating ball steering systems. These systems offer high transmission efficiency, reaching 75% to 85%, excellent wear resistance, long service life, and variable transmission ratios for stable and reliable operation, making them suitable for integrated power steering systems. However, when fully loaded and operating in a certain speed range at high speeds under poor road conditions, electric sanitation vehicles using these steering systems experience slow steering torque response and insufficient required torque, resulting in drifting and poor steering stability. Summary of the Invention

[0003] The purpose of the present invention is to provide a vehicle steering system to solve the problem of poor steering wheel stability caused by slow compensation of steering wheel steering torque when the vehicle is traveling at high speed in the current vehicle steering system; in addition, the purpose of the present invention is also to provide a pure electric sanitation vehicle to solve the problem of poor steering wheel stability when the current pure electric sanitation vehicle is traveling at high speed.

[0004] To achieve the above-mentioned purpose, the technical solution of the vehicle steering system of the present invention is as follows:

[0005] The vehicle steering system includes:

[0006] steering wheel;

[0007] Steering wheel shaft, fixed to the steering wheel;

[0008] Angle sensor, used to detect the steering wheel angle;

[0009] Electromagnetic resistance device: used to apply circumferential resistance to the steering wheel shaft; the electromagnetic resistance device includes an electromagnetic coil and a magnetic member fixed to the steering wheel shaft;

[0010] After the electromagnetic resistance device is activated, under the action of the magnetic field generated by the electromagnetic coil being energized: the electromagnetic coil and one of the magnetic poles of the magnetic member are attracted to each other, and when the steering wheel angle is zero, the electromagnetic coil and the corresponding attracted magnetic pole are arranged radially along the steering wheel shaft; and / or at least two magnetic members are provided, wherein one of the magnetic poles of the two magnetic members repels each other from the electromagnetic coil, and when the steering wheel angle is zero, the magnetic poles of the two magnetic members that repel each other from the electromagnetic coil are located on both sides of the electromagnetic coil in the circumferential direction of the steering wheel shaft;

[0011] A power supply, which provides direct current to the electromagnetic coil;

[0012] The electromagnetic resistance controller is used to control the electromagnetic resistance device to start when the vehicle speed exceeds the set value v and the steering wheel angle α exceeds the set value, so that the electromagnetic coil and the corresponding magnetic part interact to provide circumferential resistance to the steering wheel shaft.

[0013] The beneficial effects of the present invention are as follows: by setting up an electromagnetic resistance device, when the vehicle speed exceeds the set value and the steering wheel angle exceeds α, causing the steering wheel to float, the electromagnetic resistance controller can control the electromagnetic resistance device to start, and under the action of the magnetic field generated by the electromagnetic coil being energized, the electromagnetic coil interacts with the magnetic part. The electromagnetic coil can generate a circumferential resistance to the steering wheel shaft by attracting the magnetic part and / or repelling the two magnetic parts, thereby reducing the reciprocating swing angle of the steering wheel and improving the stability of the steering wheel, thereby solving the problem of poor steering wheel stability caused by slow compensation of the steering wheel steering torque when the vehicle is driving at high speed in the current vehicle steering system.

[0014] Furthermore, at least two electromagnetic coils are provided, one electromagnetic coil corresponding to at least one magnetic member, the electromagnetic coil and one magnetic pole of the corresponding magnetic member are attracted to each other, and the electromagnetic coils are spaced circumferentially along the steering wheel shaft when projected in a plane perpendicular to the axial direction of the steering wheel shaft. This can provide greater circumferential resistance to the steering wheel shaft.

[0015] Furthermore, the electromagnetic coils are spaced apart circumferentially along the steering wheel shaft, with the polarity of the two magnetic poles of the two adjacent electromagnetic coils attracting each other being opposite. Through the attraction between the electromagnetic coils and the corresponding magnetic poles, one of the two magnetic poles of the adjacent electromagnetic coils and the corresponding magnetic poles is attracted to the corresponding electromagnetic coil, while the other magnetic pole is repelled from the other electromagnetic coil, thereby providing a large circumferential resistance to the steering wheel shaft.

[0016] Furthermore, the electromagnetic coils are arranged in pairs, with two electromagnetic coils radially opposite to each other along the steering wheel shaft forming a pair, and the two magnetic poles attracted to each other in the same pair of electromagnetic coils having the same polarity, so that the force on the steering wheel shaft is balanced.

[0017] Furthermore, at least two electromagnetic coils are staggered in the axial direction of the steering wheel shaft, which provides a large arrangement space and facilitates the arrangement of the electromagnetic coils.

[0018] Furthermore, the angle between the two steering wheel shaft radius lines whose extension lines pass through the center of the adjacent electromagnetic coils and the center of the steering wheel shaft is equal to or less than 2α and greater than α. Through the attraction between the electromagnetic coils and the corresponding magnetic poles, and at the same time, among the adjacent electromagnetic coils and the corresponding two magnetic poles, one magnetic pole is attracted to the corresponding electromagnetic coil, and the other magnetic pole is repelled from the other electromagnetic coil, which can provide a larger circumferential resistance for the steering wheel shaft.

[0019] Furthermore, a supercapacitor is connected to the circuit that powers the electromagnetic coil. The supercapacitor's high current and fast charge and discharge speed allow the electromagnetic coil to provide a sufficiently strong electromagnetic field force, thereby preventing the steering wheel from swinging back and forth when the vehicle is traveling at high speed, thereby improving steering stability.

[0020] Furthermore, the electromagnetic resistance controller activates and deactivates the electromagnetic resistance device by controlling the power on and off of the electromagnetic coil. The electromagnetic resistance device activates when the electromagnetic coil is energized, causing the electromagnetic coil to interact with the corresponding magnetic member. The electromagnetic resistance device deactivates when the electromagnetic coil is deenergized. By controlling the activation and deactivation of the electromagnetic resistance device by energizing the electromagnetic coil, the control circuit is simplified and safety is enhanced.

[0021] To achieve the above objectives, the technical solution of the pure electric sanitation vehicle of the present invention is:

[0022] The pure electric sanitation vehicle includes a steering system, which includes:

[0023] The vehicle steering system includes:

[0024] steering wheel;

[0025] Steering wheel shaft, fixed to the steering wheel;

[0026] Angle sensor, used to detect the steering wheel angle;

[0027] Electromagnetic resistance device: used to apply circumferential resistance to the steering wheel shaft; the electromagnetic resistance device includes an electromagnetic coil and a magnetic member fixed to the steering wheel shaft;

[0028] After the electromagnetic resistance device is activated, under the action of the magnetic field generated by the electromagnetic coil being energized: the electromagnetic coil and one of the magnetic poles of the magnetic member are attracted to each other, and when the steering wheel angle is zero, the electromagnetic coil and the corresponding attracted magnetic pole are arranged radially along the steering wheel shaft; and / or at least two magnetic members are provided, wherein one of the magnetic poles of the two magnetic members repels each other from the electromagnetic coil, and when the steering wheel angle is zero, the magnetic poles of the two magnetic members that repel each other from the electromagnetic coil are located on both sides of the electromagnetic coil in the circumferential direction of the steering wheel shaft;

[0029] A power supply, which provides direct current to the electromagnetic coil;

[0030] The electromagnetic resistance controller is used to control the electromagnetic resistance device to start when the vehicle speed exceeds the set value v and the steering wheel angle α exceeds the set value, so that the electromagnetic coil and the corresponding magnetic part interact to provide circumferential resistance to the steering wheel shaft.

[0031] The beneficial effects of the present invention are as follows: by setting up an electromagnetic resistance device, when the vehicle speed exceeds the set value and the steering wheel angle exceeds α, causing the steering wheel to float, the electromagnetic resistance controller can control the electromagnetic resistance device to start, and under the action of the magnetic field generated by the electromagnetic coil being energized, the electromagnetic coil interacts with the magnetic part. The electromagnetic coil can generate a circumferential resistance to the steering wheel shaft by attracting the magnetic part and / or repelling the two magnetic parts, thereby reducing the reciprocating swing angle of the steering wheel and improving the stability of the steering wheel, thereby solving the problem of poor steering wheel stability caused by slow compensation of the steering wheel steering torque when the vehicle is driving at high speed in the current vehicle steering system.

[0032] Furthermore, at least two electromagnetic coils are provided, one electromagnetic coil corresponding to at least one magnetic member, the electromagnetic coil and one magnetic pole of the corresponding magnetic member are attracted to each other, and the electromagnetic coils are spaced circumferentially along the steering wheel shaft when projected in a plane perpendicular to the axial direction of the steering wheel shaft. This can provide greater circumferential resistance to the steering wheel shaft.

[0033] Furthermore, the electromagnetic coils are spaced apart circumferentially along the steering wheel shaft, with the polarity of the two magnetic poles of the two adjacent electromagnetic coils attracting each other being opposite. Through the attraction between the electromagnetic coils and the corresponding magnetic poles, one of the two magnetic poles of the adjacent electromagnetic coils and the corresponding magnetic poles is attracted to the corresponding electromagnetic coil, while the other magnetic pole is repelled from the other electromagnetic coil, thereby providing a large circumferential resistance to the steering wheel shaft.

[0034] Furthermore, the electromagnetic coils are arranged in pairs, with two electromagnetic coils radially opposite to each other along the steering wheel shaft forming a pair, and the two magnetic poles attracted to each other in the same pair of electromagnetic coils having the same polarity, so that the force on the steering wheel shaft is balanced.

[0035] Furthermore, at least two electromagnetic coils are staggered in the axial direction of the steering wheel shaft, which provides a large arrangement space and facilitates the arrangement of the electromagnetic coils.

[0036] Furthermore, the angle between the two steering wheel shaft radius lines whose extension lines pass through the center of the adjacent electromagnetic coils and the center of the steering wheel shaft is equal to or less than 2α and greater than α. Through the attraction between the electromagnetic coils and the corresponding magnetic poles, and at the same time, among the adjacent electromagnetic coils and the corresponding two magnetic poles, one magnetic pole is attracted to the corresponding electromagnetic coil, and the other magnetic pole is repelled from the other electromagnetic coil, which can provide a larger circumferential resistance for the steering wheel shaft.

[0037] Furthermore, a supercapacitor is connected to the circuit that powers the electromagnetic coil. The supercapacitor's high current and fast charge and discharge speed allow the electromagnetic coil to provide a sufficiently strong electromagnetic field force, thereby preventing the steering wheel from swinging back and forth when the vehicle is traveling at high speed, thereby improving steering stability.

[0038] Furthermore, the electromagnetic resistance controller activates and deactivates the electromagnetic resistance device by controlling the power on and off of the electromagnetic coil. The electromagnetic resistance device activates when the electromagnetic coil is energized, causing the electromagnetic coil to interact with the corresponding magnetic member. The electromagnetic resistance device deactivates when the electromagnetic coil is deenergized. By controlling the activation and deactivation of the electromagnetic resistance device by energizing the electromagnetic coil, the control circuit is simplified and safety is enhanced.

[0039] Furthermore, the electromagnetic resistance controller is connected to the vehicle controller to obtain the vehicle speed. By using the vehicle controller to obtain the vehicle speed, the steering system does not need to be equipped with a speed sensor to measure the vehicle speed, thus simplifying the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of a specific embodiment 1 of a vehicle steering system of the present invention;

[0041] Figure 2 Schematic diagram of the electromagnetic resistance controller and the power supply circuit of the electromagnetic coil in the specific embodiment 1 of the vehicle steering system of the present invention;

[0042] Figure 3 2 is a schematic diagram of the arrangement structure of the steering wheel shaft and the electromagnetic coil of the specific embodiment 2 of the vehicle steering system of the present invention;

[0043] In the figure: 1-steering wheel; 2-steering wheel shaft; 3-EHPS electric hydraulic power assist system; 31-ECU controller; 32-oil pump permanent magnet motor; 33-steering oil cup; 34-steering power hydraulic balance cylinder; 4-chassis suspension steering mechanism; 5-electromagnetic resistance device; 51-magnetic part; 52-electromagnetic coil; 6-electromagnetic resistance controller; 7-rotation angle sensor; 8-DC power supply; 9-supercapacitor; 201-steering wheel; 207-electromagnetic coil. DETAILED DESCRIPTION

[0044] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0045] In the first embodiment of the vehicle steering system of the present invention, the vehicle steering system is applied to a pure electric sanitation vehicle as an example. Of course, in other embodiments, the vehicle steering system can also be applied to other types of vehicles such as buses by modifying appropriate parameters according to actual needs.

[0046] like Figure 1 and Figure 2 As shown, the vehicle steering system includes a steering wheel 1, a steering wheel shaft 2 fixed to the steering wheel 1, and an EHPS electric hydraulic power steering system 3. The EHPS electric hydraulic power steering system 3 includes a steering ECU controller 31, an oil pump permanent magnet motor 32, a steering oil cup 33, inlet and outlet oil control solenoid valves, inlet and outlet high-pressure oil pipes, a high-pressure oil safety relief valve for the oil pump outlet pipe, and a steering power hydraulic balance cylinder 34. The EHPS electric hydraulic power steering system 3 can interact with the vehicle controller through a CAN communication logic strategy. The EHPS electric hydraulic power steering system 3 is prior art and will not be elaborated on in detail here. The vehicle steering system also includes a chassis suspension steering mechanism 4, which includes a front steering axle, wheels, steering tie rods, steering knuckle arms, steering trapezoidal arms, and a front axle wheel speed sensor.

[0047] In order to ensure the stability of the steering wheel 1 when the pure electric sanitation vehicle is traveling at high speed under complex road conditions, the vehicle steering system of the present invention is provided with an electromagnetic resistance device 5, such as Figure 1 As shown, the electromagnetic resistance device 5 includes a magnetic member 51 fixed to the steering wheel shaft 2 and an electromagnetic coil 52 arranged outside the magnetic member 51. The electromagnetic coil 52 is located on the periphery of the steering wheel shaft and is spaced apart from the steering wheel shaft. In this embodiment, four magnetic members 51 are provided. Specifically, the magnetic member 51 in this embodiment is a magnetic block fixed to the steering wheel shaft by bolts. The magnetic block protrudes from the steering wheel shaft and is a neodymium magnet. The two magnetic members 51 are spaced apart along the circumference of the steering wheel shaft 2. When the electromagnetic coil 52 is energized, it is attracted to a corresponding magnetic pole of one of the magnetic members 51. The electromagnetic coil 52 and the corresponding magnetic pole of the magnetic member 51 are arranged radially along the steering wheel shaft 2. The polarity of the two magnetic poles that attract the two electromagnetic coils 52 is opposite. When the electromagnetic coils 52 are energized, the magnetic pole of one magnetic member 51 on the steering wheel shaft 2 is attracted to the corresponding electromagnetic coil 52 and repelled from the other electromagnetic coil 52. This exerts circumferential resistance on the steering wheel shaft 2, limits the swing angle of the steering wheel 1, and reduces the floating phenomenon of the steering wheel 1. The electromagnetic coils 52 are fixed inside the vehicle. In other embodiments, the magnetic member may include a protrusion fixed to the steering wheel shaft and a neodymium magnet layer fixed to the protrusion.

[0048] The vehicle steering system also includes an electromagnetic resistance controller 6 and an angle sensor 7 mounted on the steering wheel shaft 2. The angle sensor 7 is used to detect the steering wheel 1's angle. In this embodiment, the angle sensor 7 is a Hall effect sensor. A Hall effect sensor is a magnetoelectric sensor that uses a Hall element to convert a measured value into an electromotive force (EMF) output based on the Hall effect principle. Hall effect elements have the unique ability to sense magnetic fields when stationary. They also feature a simple structure, compact size, low noise, a wide frequency range (from DC to microwave), a large dynamic range (a wide range of output potential variations), and a long lifespan. In this embodiment, a magnetic block corresponding to the Hall effect element is located below the steering wheel 1 and fixed to the steering wheel shaft 2. The fixed element is a metal semiconductor sheet within the sensor (receiving the induction). This acts as the induced electromotive force generated in the rotating magnetic field. The induced electromotive force is then fed back to the electromagnetic resistance controller via voltage, converting the output DC voltage signal into an angle-proportional signal. Of course, in other embodiments, the angle sensor may also utilize other types of sensors, such as a rotary encoder. To simplify the structure, the angle sensor may be the steering wheel angle sensor included with the steering system.

[0049] The electromagnetic resistance controller 6 is a PLC controller. In other embodiments, the electromagnetic resistance controller 6 may also be a single-chip microcomputer programmable control board or other forms. In this embodiment, the electromagnetic resistance controller 6 controls the activation and deactivation of the electromagnetic resistance device 5 by controlling the energization and deactivation of the electromagnetic coil 52. The electromagnetic resistance device 5 is activated when the electromagnetic coil 52 is energized, causing the electromagnetic coil 52 to interact with the corresponding magnetic member 51. The electromagnetic resistance device 5 is deactivated when the electromagnetic coil 52 is deenergized. In other embodiments, the electromagnetic resistance controller can also control the start and stop of the electromagnetic resistance device through other circuits. For example, the electromagnetic resistance controller can control the start and stop of the electromagnetic resistance device by controlling the current in the electromagnetic coil. When there is no need to stabilize the steering wheel, the electromagnetic resistance controller controls the current in the electromagnetic coil to be very small. At this time, the circuit where the electromagnetic coil is located is in a triggered standby hot state. The circuit where the electromagnetic coil is located can reduce the current to a set value by connecting a larger resistor in series. At this time, the magnetic field generated by the electromagnetic coil is not sufficient to interact with the magnetic part to provide resistance to the steering wheel shaft. At this time, the electromagnetic resistance device is in a closed state; when it is necessary to stabilize the steering wheel, the electromagnetic resistance controller controls the electromagnetic coil current to increase by removing the resistor in series in the circuit where the electromagnetic coil is located. At this time, the circuit where the electromagnetic coil is located is in a triggered state. The magnetic field generated by the electromagnetic coil causes the electromagnetic coil to interact with the magnetic part to generate circumferential resistance to the steering wheel shaft. At this time, the electromagnetic resistance device is in a started state.

[0050] The electromagnetic resistance controller 6 is used to communicate with the vehicle controller to obtain vehicle speed information and with the steering angle sensor 7 to obtain steering wheel 1 angle information. The electromagnetic resistance controller 6 is used to control the electromagnetic coil 52 to energize and attract the corresponding magnetic member 51 when the vehicle speed exceeds the set value v and the steering wheel 1 angle α exceeds the set value. When either the vehicle speed is lower than the set value v or the steering wheel 1 angle is less than the set value α, the electromagnetic resistance controller 6 controls the electromagnetic coil 52 to de-energize. For example, the set value v should be selected from 50 km / h to 90 km / h, and the set value α should be selected from 15° to 25°. The specific selected values ​​can be selected according to actual needs. In this embodiment, α is selected as 15°, and the two magnetic members 51 are arranged on the left and right sides of the steering wheel shaft 2. The two electromagnetic coils 52 are also arranged on the left and right sides of the steering wheel 1, and the two magnetic induction coils are arranged symmetrically. The angle between the two steering wheel shaft 2 radius lines whose extension lines pass through the center of the adjacent electromagnetic coil 52 and the center of the steering wheel shaft 2 is equal to 30°, that is, the extension lines of the two steering wheel shaft 2 radius lines pass through the center of the adjacent electromagnetic coil 52 and the center of the steering wheel shaft 2, ensuring that the steering wheel 1 of the pure electric sanitation vehicle is always subject to greater resistance during the reciprocating swinging process when driving at high speed. In other embodiments, the angle can also be less than 30° and greater than 15°. Of course, in other embodiments, the two magnetic induction coils can also be arranged not symmetrically on the left and right, for example, they can be arranged front and back, and the magnitude of their resistance to the steering wheel shaft remains unchanged.

[0051] The electromagnetic coil 52 is powered by a DC power supply 8. In this embodiment, the power supply is a 24V on-board electronically controlled DC power supply. In other embodiments, this could be a high-voltage on-board power supply, converted to a suitable voltage via a transformer. Of course, depending on the actual situation, AC power could also be used, but a converter would be required to convert it to DC power. In this embodiment, the daily power supply to the electromagnetic resistance controller 6 is controlled by the ON ignition.

[0052] The electromagnetic resistance control circuit powers electromagnetic coil 52. This circuit incorporates a supercapacitor 9. Its high current and fast charge / discharge characteristics allow electromagnetic coil 52 to generate a sufficiently strong electromagnetic field, thereby preventing the steering wheel 1 from swinging back and forth during high-speed driving, thereby improving steering stability. The electromagnetic resistance controller 6 receives feedback from the vehicle speed and steering angle sensor 7. After analysis and calculation, it outputs signals from signal ports 1+ and 1- of the left-steering magnetic resistance signal relay K1 and signal ports 2+ and 2- of the right-steering magnetic resistance signal relay K2, energizing or de-energizing electromagnetic coil 52. Ports 5+ and 5- are used to collect Hall effect angle signals from the steering wheel 11 shaft, while ports 6+ and 6- are used to collect the chassis front axle wheel speed signals.

[0053] The electromagnetic resistance controller collects and analyzes the DC voltage signals from the vehicle speed sensor and the Hall effect sensor, then compares and outputs logic signals through the interaction of the vehicle's HCU controller, the electromagnetic resistance controller, and the steering ECU controller. In an emergency, when the pure electric sanitation vehicle's speed exceeds a set value v and the steering angle exceeds a set value α0 (the set value α0 is greater than the set value α, such as when the driver is fatigued or drunk driving at high speed), or when the steering is drifting while heavily loaded, the magnetic resistance controller triggers to control the electromagnetic resistance device to stabilize the steering angle for driver safety. Simultaneously, the magnetic resistance voltage signal is output (via signal ports 1+, 1-, 2+, 2-) to the vehicle control unit (HCU) for comparison and calculation, determining whether to implement the AEBS (Active Braking Assist System) to enhance driver safety.

[0054] The electromagnetic resistance controller 6 collects and analyzes the DC voltage signals from the vehicle speed sensor and the steering angle sensor, then compares them with information from the vehicle controller and the steering controller to generate a logic signal output. When the pure electric sanitation vehicle experiences steering drift during high-speed, heavy-load operation (i.e., when the speed exceeds the set value and the steering angle swings by more than 15°), the electromagnetic resistance controller 6 is triggered to stabilize the steering angle. A magnetic resistance signal is output via signal ports 1+, 1-, 2+, and 2-. The magnetic resistance device activates, energizing the electromagnetic coil 52 and generating an attractive force between it and the magnetic element 51, which resists the steering wheel shaft 2 and reduces the swing amplitude of the steering wheel 1. When the vehicle speed decreases, falling below the set value v, or when the vehicle is traveling in good road conditions and the steering angle is less than the set value α, the magnetic resistance condition is no longer met. The electromagnetic resistance controller 6 de-energizes the electromagnetic coil 52, and the vehicle's steering system, controlled normally by the EHPS, then controls the steering.

[0055] The number of magnetic parts in the present invention is two, and two electromagnetic coils are set. In other embodiments, the number of magnetic parts can be set as needed, for example, one electromagnetic coil can correspond to two magnetic parts; one electromagnetic coil can also be set, or more than three can be set.

[0056] In this embodiment, the two electromagnetic coils are spaced apart along the circumference of the steering wheel shaft. In other embodiments, the two electromagnetic coils may also be staggered in the axial direction of the steering wheel shaft, as long as at least two electromagnetic coils are spaced apart along the circumference of the steering wheel shaft when projected in a plane perpendicular to the axial direction of the steering wheel shaft.

[0057] In this embodiment, the polarities of the two magnetic poles that are attracted to each other by the two electromagnetic coils are opposite. In other embodiments, when multiple electromagnetic coils are arranged at intervals along the circumference of the steering wheel, the polarities of the two magnetic poles that are attracted to each other by the two electromagnetic coils that are adjacent to each other along the circumference of the steering wheel shaft are opposite. At this time, a greater resistance can be provided.

[0058] In this embodiment, only two electromagnetic coils are provided, and the direction of their resultant force is toward the radial direction of the steering wheel shaft. In other embodiments, in order to balance the radial force of the steering wheel, the electromagnetic coils are provided in pairs, and the two electromagnetic coils radially opposite to each other along the steering wheel shaft form a pair. The two magnetic poles attracted to each other in the same pair of electromagnetic coils have the same polarity. At this time, the resultant force of the forces acting on each electromagnetic coil and the magnetic part is zero.

[0059] In this embodiment, a supercapacitor is connected to the circuit that supplies power to the electromagnetic coil. In other embodiments, the output current of the DC power supply may be increased without using a supercapacitor.

[0060] In this embodiment, the angle between the two steering wheel shaft radius lines whose extension lines pass through the centers of adjacent electromagnetic coils and the centers of the steering wheel shaft is equal to or less than 2α and greater than α. In other embodiments, the angle between the two steering wheel shaft radius lines whose extension lines pass through the centers of adjacent electromagnetic coils and the centers of the steering wheel shaft may also be greater than 2α, or less than α.

[0061] In this embodiment, the electromagnetic resistance controller is connected to the vehicle controller to obtain the vehicle speed. In other embodiments, another sensor can be provided to detect the vehicle speed.

[0062] The specific embodiment 2 of the vehicle steering system of the present invention is different from the specific embodiment 1 above only in that, Figure 3 As shown, the two electromagnetic coils 207 are staggered in the axial direction of the steering wheel 201 shaft, and the magnetic block in the figure does not show the other magnetic pole.

[0063] Specific embodiment 3 of the vehicle steering system of the present invention is different from the above-mentioned specific embodiment 1 only in that, in this embodiment, the electromagnetic coil and each magnetic part repel each other. Through the repulsive force between the electromagnetic coil and each magnetic part, the electromagnetic coil and the corresponding magnetic parts interact with each other to provide resistance to the steering wheel shaft.

[0064] A specific embodiment of the pure electric sanitation vehicle of the present invention includes a steering system, and the steering system has the same structure as the vehicle steering system described in any of the above embodiments.

Claims

1. Vehicle steering system, including: steering wheel; Steering wheel shaft, fixed to the steering wheel; Angle sensor, used to detect the steering wheel angle; It is characterized by: The vehicle steering system also includes: Electromagnetic resistance device: used to apply circumferential resistance to the steering wheel shaft; the electromagnetic resistance device includes an electromagnetic coil and a magnetic member fixed to the steering wheel shaft; After the electromagnetic resistance device is activated, under the action of the magnetic field generated by the electromagnetic coil being energized: the electromagnetic coil and one of the magnetic poles of the magnetic member are attracted to each other, and when the steering wheel angle is zero, the electromagnetic coil and the corresponding attracted magnetic pole are arranged radially along the steering wheel axis; and / or At least two magnetic members are provided, wherein one magnetic pole of each of the two magnetic members repels the electromagnetic coil, and when the steering wheel angle is zero, the magnetic poles of the two magnetic members that repel the electromagnetic coil are located on both sides of the electromagnetic coil in the circumferential direction of the steering wheel shaft; A power supply, which provides direct current to the electromagnetic coil; The electromagnetic resistance controller is used to control the electromagnetic resistance device to start when the vehicle speed exceeds the set value v and the steering wheel angle α exceeds the set value, so that the electromagnetic coil and the corresponding magnetic part interact with each other to provide circumferential resistance to the steering wheel shaft to reduce the reciprocating swing angle of the steering wheel.

2. The vehicle steering system according to claim 1, characterized in that: At least two electromagnetic coils are provided, one electromagnetic coil corresponds to at least one magnetic part, the electromagnetic coil is attracted to a magnetic pole of the corresponding magnetic part, and the electromagnetic coils are projected in a plane perpendicular to the axial direction of the steering wheel shaft and spaced circumferentially along the steering wheel shaft.

3. The vehicle steering system according to claim 2, characterized in that: The electromagnetic coils are arranged at intervals along the circumference of the steering wheel shaft, and the polarities of the two magnetic poles attracted to each other by the two electromagnetic coils adjacent to each other along the circumference of the steering wheel shaft are opposite.

4. The vehicle steering system according to claim 3, characterized in that: The electromagnetic coils are arranged in pairs, and two electromagnetic coils radially opposite to each other along the steering wheel shaft form a pair, and the two magnetic poles attracted to each other in the same pair of electromagnetic coils have the same polarity.

5. The vehicle steering system according to claim 2, characterized in that: At least two electromagnetic coils are staggered in the axial direction of the steering wheel shaft.

6. The vehicle steering system according to claim 2, 3 or 4, characterized in that: An angle between an extension line of a steering wheel shaft radius line passing through the center of the electromagnetic coil and an extension line of a steering wheel shaft radius line passing through the center of an adjacent electromagnetic coil is equal to or less than 2α and greater than α.

7. The vehicle steering system according to any one of claims 1 to 5, characterized in that: A supercapacitor is connected to the circuit that powers the electromagnetic coil.

8. The vehicle steering system according to any one of claims 1 to 5, characterized in that: The electromagnetic resistance controller controls the start and stop of the electromagnetic resistance device by controlling the power on and off of the electromagnetic coil. The electromagnetic resistance device starts after the electromagnetic coil is powered on, so that the electromagnetic coil interacts with the corresponding magnetic part. The electromagnetic resistance device is shut down after the electromagnetic coil is powered off.

9. A pure electric sanitation vehicle, including a steering system, characterized in that: The steering system is the vehicle steering system according to any one of claims 1 to 8.

10. The pure electric sanitation vehicle according to claim 9, characterized in that: The electromagnetic resistance controller is connected to the vehicle controller for communication to obtain the vehicle speed.

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