WO2021004441A1 - Steering wheel position checking system and checking method - Google Patents

Abstract

Disclosed are a steering wheel position checking system and a checking method, the steering wheel position checking system comprising: a toothed disc (22) having several toothed grooves, and magnetic elements being arranged at intervals at the several toothed grooves; a locking mechanism, mounted inside a side wall of a steering wheel tubular column (21), the locking mechanism being arranged corresponding to the toothed disc (22) of a steering wheel (14), and the locking mechanism comprising a lock pin (212) having a Hall element (213), and the lock pin (212) being snapped into the toothed groove when the system is powered off; and a detection device connected to the Hall element (213), wherein when the system is powered on again, an angle value corresponding to the position of the steering wheel is checked according to an output signal of the Hall element (213). The system effectively ensures a one-to-one correspondence relationship between the position of the steering wheel and the position of a vehicle wheel after the system is powered off and restarted, completes checking of the position of the steering wheel at the moment of energization, simplifies the checking process, and improves the checking precision.

Description

Steering wheel position verification system and verification method Technical field

The invention belongs to the field of hydraulic steering, and relates to a steering wheel position verification system and a verification method.

Background technique

As low-speed and heavy-duty vehicles such as construction vehicles and special operation vehicles are widely used in various industries, they have improved work production efficiency and reduced production costs. Existing low-speed and heavy-duty operating vehicles adopt hydraulic steering systems due to the special chassis layout structure and the torque requirements of the operating environment for the steering system.

Due to the inevitable leakage in the hydraulic system, there is no one-to-one correspondence between the steering wheel and the steering wheel of the low-speed and heavy-duty vehicle. Therefore, the operator cannot accurately steer when driving the vehicle. The security brings a great threat. The hydraulic synchronous steering system can achieve a one-to-one correspondence between the steering wheel and the steering wheel of the vehicle, ensuring the steering intention of the driver at all times, thereby reducing the driving difficulty of the operator and improving the driving accuracy.

In the hydraulic synchronous steering system, when the vehicle is turned off and the synchronous steering system is in a power-off process, if the steering wheel rotates, it will cause the loss of the steering wheel position signal record, which will cause the corresponding relationship between the steering wheel and the wheel position to change, and increase the driver’s The difficulty of operation even threatens the safety of vehicles and personnel. Therefore, the verification of the steering wheel position after the hydraulic steering system is powered off and restarted is the key to achieve hydraulic synchronous steering.

Summary of the invention

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a steering wheel position verification system and verification method, which are used to solve the loss of steering wheel position signal recording caused by the rotation of the steering wheel during power interruption in the prior art. As a result, the corresponding relationship between the steering wheel and the wheel position changes.

In order to achieve the above objectives and other related objectives, the present invention provides a steering wheel position verification system, including:

The toothed disk has a plurality of tooth grooves, and the plurality of tooth grooves are provided with magnetic elements at intervals;

The locking mechanism is installed in the side wall of the steering wheel pipe column, and the locking mechanism is arranged corresponding to the gear plate of the steering wheel; the locking mechanism includes a lock pin with a Hall element, and the lock pin is locked when the system is powered off Into the tooth slot;

The detection device is connected to the Hall element, and when the system is re-powered on, the steering wheel position corresponds to the angle of rotation according to the output signal of the Hall element.

In an embodiment of the present invention, the locking mechanism further includes a driving element and an elastic element connecting the driving element and the lock pin, and the driving element pulls the lock pin to be placed in the side wall when the system is powered on. , The elastic element is compressed.

In an embodiment of the present invention, the driving element is an electromagnetic relay, an air cylinder or a hydraulic cylinder.

In an embodiment of the present invention, when the driving element is an electromagnetic relay, one side of the lock pin is fixedly connected to an armature, and the electromagnetic relay is connected to the armature through an elastic element.

In an embodiment of the present invention, when the driving element is an air cylinder or a hydraulic cylinder, the push rod of the driving element is connected to the lock pin, and the elastic element is sheathed outside the push rod.

In an embodiment of the present invention, the elastic element is a spring or rubber.

In an embodiment of the present invention, the magnetic element is a magnetic sheet.

The present invention also provides a steering wheel position verification method, which includes the following steps:

S1, the detection device records the steering wheel position corresponding to the angle of rotation n1 when the system is powered off;

S2, determine the initial tooth groove of the gear wheel corresponding to the lock pin of the locking mechanism, and the steering wheel angle value n2 of the initial tooth groove,

S3, selecting adjacent tooth grooves of the initial tooth groove along the rotation direction of the tooth wheel, and obtaining a steering wheel rotation angle value n3 corresponding to the adjacent tooth groove;

S4, the lock pin is stuck into the tooth slot of the gear wheel, the system is powered on and restarted, and the detection device re-reads the steering wheel angle value n1 corresponding to the steering wheel position at the last power failure, the steering wheel angle value n2 of the initial tooth groove The steering wheel angle value n3 of the adjacent tooth groove;

S5: Detect the output signal of the Hall element, determine the tooth slot into which the lock pin is locked, and obtain the verified steering wheel angle value.

In an embodiment of the present invention, the step of determining the tooth groove into which the locking mechanism is locked and obtaining the steering wheel angle value corresponding to the tooth groove includes:

S51, detecting the output signal of the Hall element,

S52: Determine whether the initial tooth slot and the adjacent tooth slot are provided with magnetic elements.

In an embodiment of the present invention, the step of determining the tooth groove into which the locking mechanism is locked and obtaining the steering wheel angle value corresponding to the tooth groove further includes:

S53: When the initial cogging is provided with a magnetic element and there is no voltage change in the output of the Hall element, it is determined that the cogging locked by the locking mechanism is an adjacent cogging, and the steering wheel angle value n after verification is =n3;

S54: When the initial cogging is not provided with a magnetic element, and there is a voltage change in the output of the Hall element, it is determined that the cogging locked by the locking mechanism is an adjacent cogging, and the steering wheel angle value after verification n=n3, otherwise, the steering wheel angle value after verification is n=n2.

As mentioned above, the present invention can determine the rotation angle value corresponding to the steering wheel position when the system is powered on and restart, effectively guarantee the one-to-one correspondence between the steering wheel position and the wheel position after the system is powered off and restart, and complete the steering wheel position verification at the moment of power-on, simplifying the verification The process improves the calibration accuracy.

At the same time, in the present invention, after the system is powered off, the locking mechanism will lock the steering wheel, thereby ensuring that the steering wheel will not rotate freely after power off to protect the hydraulic system, and effectively limit the rotation range of the steering wheel after power off.

In addition, the present invention can use the delay of the driving element to complete the verification of the steering wheel position. Because the delay time is very short, the driver will not feel a jam when using the steering wheel after the system is powered on.

Description of the drawings

Fig. 1 shows a schematic structural diagram of a hydraulic synchronous steering system applicable to the present invention.

Figure 2 shows a schematic diagram of the installation position of the steering wheel angle sensor.

Figure 3 is a schematic diagram of the structure of the steering wheel position verification system of the present invention.

Fig. 4 is a schematic diagram showing the structure of the electromagnetic relay as the driving element in the steering wheel position verification system of the present invention.

Fig. 5 is a schematic diagram of the structure in which the driving element of the steering wheel position verification system of the present invention is an air cylinder.

Fig. 6 is a schematic diagram of the flow chart of the steering wheel position verification method of the present invention.

Detailed ways

The following specific examples illustrate the implementation of the present invention. Those familiar with the technology can easily understand the other advantages and effects of the present invention from the content disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings in this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not intended to limit the implementation of the present invention Limited conditions, so it has no technical significance. Any structural modification, proportional relationship change or size adjustment should still fall under the present invention without affecting the effects and objectives that can be achieved by the present invention. The disclosed technical content must be within the scope of coverage. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the text. The scope of implementation of the invention, the change or adjustment of its relative relationship, shall be regarded as the scope of implementation of the invention without substantial changes to the technical content.

Hydraulic steering systems are commonly used in low-speed and heavy-duty vehicles such as construction machinery, forklifts, tractors, and combine harvesters. The steering wheel verification system in this embodiment is suitable for a hydraulic synchronous steering system. The hydraulic synchronous steering system can achieve a one-to-one correspondence between the vehicle steering wheel and the steering wheel, ensuring the steering intention of the driver at all times, thereby reducing the operator The difficulty of driving, improve driving accuracy.

For ease of understanding, in this embodiment, a hydraulic synchronous steering system for a low-speed and heavy-duty vehicle is given. Please refer to Fig. 1, taking a forklift as an example. The hydraulic synchronous steering system may include an oil tank 1, an oil pump 2, a steady flow valve 3, a steering system relief valve 4, a full hydraulic steering gear 5, a one-way valve 6 and a steering cylinder 9; the passage steering wheel of the full hydraulic steering gear 5 The steering shaft 20 is connected to the steering wheel 14. At the same time, as shown in FIG. 2, a steering wheel column 21 is sleeved outside the steering shaft 20, and the steering wheel column 21 does not rotate with the steering shaft 20.

In addition, a rotation angle sensor 13 is installed on the steering shaft 20 of the steering wheel 14. The rotation angle sensor 13 rotates with the steering wheel 14 to detect the rotation angle value and the rotation direction of the steering wheel 14. The rotation angle sensor 13 can be a photoelectric rotation angle sensor, and the sensor turntable 131 of the rotation angle sensor 13 is sleeved on the steering shaft 20. In a manner easily understood by those skilled in the art, the steering angle sensor may be composed of a photoelectric coupling element, a slotted plate, and the like. The photoelectric coupling elements are light emitting diodes and phototransistors. The slotted plate is placed between the light emitting diode and the phototransistor. The slotted plate has many small holes. When the steering wheel 14 rotates, the slotted plate will follow the rotation. The phototransistor operates according to the light passing through the slotted plate and outputs a digital pulse signal. In this embodiment, the clockwise direction is set as positive, and the steering wheel 14 can generate 360 pulses per revolution. One pulse number represents the steering wheel angle value of 1°. When the wheel is turned on, the steering angle sensor records The steering wheel angle value is cleared.

The hydraulic synchronous steering system also includes a compensation mechanism to achieve a one-to-one correspondence between the vehicle steering wheel 14 and the steering wheel. The compensation mechanism includes a first solenoid valve 7, a first throttle valve 8, a second solenoid valve 12, and a second solenoid valve. The second throttle valve 11; the a port of the first solenoid valve 7 and the a1 port of the second solenoid valve 12 are connected in parallel through the one-way valve 6 to the P oil inlet of the full hydraulic steering gear 5; the first throttle valve 8 is connected in series On port b of the first solenoid valve 7, the outlet of the first throttle valve 8 is respectively connected to the left working chamber of the steering cylinder 9 and a working oil port of the full hydraulic steering gear 5; the second throttle valve 11 is connected in series with the second On the b1 port of the solenoid valve 12, the outlet of the second throttle valve 11 is respectively connected to the right working chamber of the steering cylinder 9 and a working oil port of the full hydraulic steering gear 5. When working, the first throttle valve 8 is used to adjust the flow rate from the first solenoid valve 7 into the steering cylinder 9; the second throttle valve 11 is used to adjust the flow rate from the second solenoid valve 12 into the steering cylinder 9; according to the wheel angle The difference between the rotation angles of the potentiometer 10 and the rotation angle sensor 13 determines whether the first solenoid valve 7 and the second solenoid valve 12 are energized or stopped.

In the embodiment of the present invention, the steering wheel position verification system is used to verify the steering wheel position at the moment the system is powered on, which simplifies the verification process and improves the verification accuracy.

Please refer to Figure 3, which shows the structure diagram of the steering wheel position verification system. The steering wheel position verification system includes:

The locking mechanism is installed in the side wall of the steering wheel column 21. The locking mechanism includes a mechanism body and a lock pin 212 connected to the mechanism body. The steering wheel column 21 is provided with a mounting hole 211 for the locking mechanism to be placed. The mechanism body can drive the lock pin 212 to reciprocate left and right in the direction shown. .

The gear wheel 22 is sleeved on the steering shaft 20 of the steering wheel 14, and the gear wheel 22 is arranged corresponding to the locking mechanism. The gear wheel 22 and the steering shaft 20 can be fixedly connected by fasteners such as bolts, so that the gear wheel 22 can rotate synchronously with the steering shaft 20.

When the lock pin 212 is pushed out of the mounting hole 211, it will be locked into the tooth groove of the toothed disk 22 opposite to it. The gear plate 22 has several tooth slots. In this embodiment, when the hydraulic synchronous steering system is powered off, the mechanism body pushes the lock pin 212 to snap into the tooth slots of the gear plate 22, and when the system is powered on again, the The body of the mechanism drives the lock pin 212 to reset. Therefore, after the system is powered off, its locking mechanism will lock the steering wheel 14 so as to ensure that the steering wheel 14 will not rotate freely after power off to protect the hydraulic system and effectively limit the rotation range of the steering wheel 14 after power off.

At the moment when the system is powered off, the lock pin 212 is arranged corresponding to a tooth slot, but has not been inserted into the slot in time. There is a delay in the process of the lock pin 212 being pushed out from the mounting hole 211 to being locked into the slot. Therefore, at the moment of power failure and when the lock pin 212 is stuck in the two states, the slot corresponding to the lock pin 212 will be inconsistent. At the same time, the steering wheel position recorded in the system will be when the lock pin 212 is stuck in the slot. When a change occurs, or at the moment when the system is powered off, the steering wheel 14 has a certain steering angle. Since the delay time of the lock pin 212 is very short, the distance of the steering wheel 14 is roughly one tooth. Therefore, in this embodiment, after the system is powered on again, the steering wheel position is verified.

In this embodiment, several tooth slots on the gear plate 22 are provided with magnetic elements at intervals (the thick solid lines in the gear outline of the gear plate 22 in Figure 3 indicate magnetic elements), and the magnetic elements are arranged at intervals. In an embodiment, the magnetic element is a magnetic sheet, which can be directly pasted on the surface of the tooth groove, or fasteners such as screws, bolts, etc. are used to fix the magnetic sheet on the surface of the tooth groove. The tooth groove has two tooth groove surfaces. , You can install magnets on both the surfaces of the tooth grooves, or install the magnets on only one of the tooth groove surfaces. It should be noted that, in order to facilitate the determination of the tooth slot where the magnetic element is installed, each tooth slot on the gear plate 22 is numbered, and the magnetic element is corresponding to the number of the tooth slot where it is located.

At the same time, a Hall element 213 is installed on the lock pin 212. Specifically, a groove for installing the Hall element 213 is opened on the lock pin 212. At the same time, the verification system also includes a detection device connected to the Hall element 213. , The detection device includes a voltage detection device. In this embodiment, the Hall element 213 can be a linear Hall element 95A. The Hall element 213 has three pins. The first pin is connected to the positive pole of a power supply 218 through a power line, and the second lead The pin is connected to the negative pole of the power supply 218 through a power cord. The power supply 218 is a car power supply or an additional power supply 218 installed on the steering wheel column 21. The third pin of the Hall element 213 is detected by a signal line and voltage. The input terminal of the device is connected, and the output terminal of the voltage detection device is connected to the second pin to detect the output voltage of the Hall element 213. The detection device may be directly integrated in the electronic control unit of the automobile.

At the moment when the system is powered off, the tooth slot corresponding to the lock pin 212 is the initial tooth slot. The initial tooth slot and its adjacent tooth slot must exist. One of the tooth slots is equipped with a magnetic element. In the cogging of the element, the Hall effect occurs between the Hall element 213 and the magnetic element. Once the system is powered on again, the Hall element 213 will output a high level and its voltage will change. On the contrary, when the lock pin 212 is stuck When entering the slot where there is no magnetic element, after the system is powered on, the output voltage of the Hall element 213 does not change, so that the slot into which the lock pin 212 is stuck can be judged, and the steering wheel position is finally determined and the verification is completed.

In this embodiment, the mechanism body drives the lock pin 212 to retract the mounting hole 211 and snap into the cogging according to the power on and off of the system. Further, the mechanism body includes a driving element 215 and connecting the driving element 215. For the elastic element 214 of the lock pin 212, the elastic element 214 can be spring or rubber. The drive element 215 provides driving force to the lock pin 212. When the system is powered on, the drive element 215 drives the lock pin 212 to retract into the mounting hole 211, while the elastic element 214 is compressed, and the steering wheel 14 can rotate freely. When the system is powered off , Under the force of the elastic element 214, the lock pin 212 is pushed into the tooth groove.

In one embodiment, the driving element 215 can be an electromagnetic relay 216, as shown in FIG. 4, correspondingly, an armature 217 can be fixedly connected to one side of the lock pin 212, and the electromagnetic relay 216 is connected to the armature through an elastic element 214, such as a spring. 217. The magnetic attraction between the electromagnetic relay 216 and the armature 217 when energized causes the lock pin 212 to be fixed in the mounting hole 211. At this time, the elastic element 214 is in a compressed state, and when the system is powered off, the electromagnetic relay 216 and the armature The magnetic attraction force between 217 disappears. At this time, under the force of the elastic element 214, the lock pin 212 is pushed out and locked into the tooth groove of the toothed disk 22, thereby locking the toothed disk 22.

In another embodiment, the driving element 215 can use an air cylinder or a hydraulic cylinder. As shown in FIG. 5, the air cylinder is taken as an example for description. According to the linear movement of the lock pin 212, the air cylinder is a linear reciprocating cylinder. The piston, cylinder 219, and push rod 2191 are composed of connecting the input end of the cylinder 219 of the air cylinder with an external air source. The push rod 2191 is fixedly connected to the lock pin 212. At the same time, an elastic element 214 is sleeved outside the push rod 2191. The elastic element 214 can be connected to the cylinder body of the cylinder and the lock pin 212. When the power is turned on, the cylinder acts to push the push rod 2191 toward the side away from the ring gear 22, thereby driving the lock pin 212 to retract into the mounting hole 211, and the elastic element 214 It is compressed, and when the system is powered off, under the force of the elastic element 214, the locking pin 212 is pushed out and locked into the tooth groove of the toothed disk 22, thereby locking the toothed disk 22.

Of course, the driving element 215 can also adopt other structures, such as a motor. The motor drives the lock pin 212 through a connecting rod to retract the mounting hole 211. At the same time, when the system is powered off, the lock pin 212 can be locked into the tooth slot. Therefore, without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements to realize the reciprocating movement of the lock pin 212, and these changes and improvements fall within the scope of the claimed invention.

This embodiment also provides a steering wheel position verification method based on the above steering wheel position verification system. As shown in Figure 6, the verification method mainly uses components such as electromagnetic relays, air/power sources of cylinders/hydraulic cylinders, etc. The system will not be powered on at the moment the system is powered on, so that after the system is powered on again, there is a delay in the locking mechanism driving the lock pin to retract. The present invention uses the delay time to verify the position of the steering wheel.

The steering wheel position verification method mainly includes the following steps:

S1, the detection device records the steering wheel position corresponding to the angle n ₁ when the system is powered off.

S2: Determine the initial tooth groove of the gear wheel corresponding to the lock pin of the locking mechanism, and the steering wheel angle value n2 of the initial tooth groove.

S3: Select adjacent tooth grooves of the initial tooth groove along the rotation direction of the tooth wheel, and obtain the steering wheel rotation angle value n3 corresponding to the adjacent tooth groove.

It should be noted that when the system is not powered off, the steering wheel angle value is collected by the detection device, and the detection device obtains the data pulse signal output by the steering angle sensor. The detection device can be directly integrated into the electronic control unit of the car. The detection device is based on the data The pulse signal recording system steering wheel position corresponds to the rotation angle value. According to the number of tooth grooves on the gear wheel, since the shape of the tooth groove is roughly trapezoidal, each tooth groove has a corresponding rotation angle value range. At the same time, the rotation angle value corresponding to the bottom of the tooth groove can be determined. In this embodiment, the steering wheel angle value of the cogging refers to the steering wheel angle value at the bottom of the cogging.

For ease of understanding, an example is now illustrated. In this embodiment, as shown in the figure, the toothed disk is evenly provided with 24 tooth slots, the direction of rotation is clockwise, and one tooth slot is selected and numbered as tooth slot a1. The tooth slots are sequentially numbered in the clockwise direction of the toothed disc as tooth slot a2, tooth slot a3, tooth slot a4...tooth slot a24.

Therefore, according to the number of cogging, it is determined that in the first lap, the rotation angle value range corresponding to cogging a1 is 0-20, the rotation angle value range corresponding to cogging a2 is 21-40, and the rotation angle value range corresponding to cogging a3 is It is 41-60, and so on until the tooth slot a24.

At the same time, when the steering wheel angle value of the tooth slot a1 is 10, the lock pin is set corresponding to the bottom of the tooth slot a1. Therefore, when the lock pin is stuck in the tooth slot a1, the steering wheel position corresponds to the rotation angle value of 10, and in the second When the bottom of the tooth groove a1 in the ring corresponds to the lock pin, the steering wheel angle value is 370. Correspondingly, the other tooth grooves can determine the corresponding steering wheel angle value according to the position on the gear wheel, such as the clockwise direction and the tooth groove. The steering wheel angle of the adjacent tooth slot a2 is 30. The steering wheel angle value and the angle range of each cogging and cogging form a mapping table, and the mapping table can be stored in the memory of the detection device.

In addition, since the space between the tooth grooves of the toothed disk refers to the presence of magnetic elements, the mapping table also includes the number correspondence between the magnetic elements and the tooth grooves, for example, magnetic elements are arranged in the tooth grooves with odd numbers.

Therefore, when the steering wheel angle value is 15 when the system is powered off, it can be determined that it is within the range of the rotation angle value of the tooth slot a1 according to the mapping table. At this time, the lock pin corresponds to the tooth slot a1. The steering wheel angle value is used as the steering wheel angle value n2 of the initial cogging. If the rotation direction is clockwise, the tooth groove a2 is used as the adjacent tooth groove, and the steering wheel angle value of the tooth groove a2 is used as the steering wheel angle value n3 of the adjacent tooth groove.

S4, the locking pin snaps into the gullet of the chainring, the system power-on reset, can be re-read by the detection apparatus when a power loss angle value n1 corresponding to the position of the steering wheel, the steering angle initial value of n ₂ cogging , The steering wheel angle value n _{3 of} the adjacent tooth groove.

S5: Detect the output voltage of the Hall element, determine the tooth slot into which the lock pin is locked, and obtain the verified steering wheel angle value. Specifically, the step S5 mainly includes the following steps:

S51: Detect the output signal of the Hall element, and the voltage detection device in the detection device may directly collect the output signal of the Hall element to determine whether the output voltage of the Hall element has changed.

S52: Determine whether the initial tooth slot and the adjacent tooth slot are provided with magnetic elements. Specifically, after determining the initial cogging and adjacent cogging, the cogging where the magnetic element is located can still be determined according to the mapping table in the detection device.

Since the magnetic element is close to the Hall element, the Hall effect can be generated, so the cogging into which the lock pin is locked can be further determined according to the voltage output by the Hall element.

S53: When the initial cogging is provided with a magnetic element and there is no voltage change in the output of the Hall element, it is determined that the cogging locked by the locking mechanism is an adjacent cogging, and the steering wheel angle value n after verification is =n ₃ ;

S54: When the initial cogging is not provided with a magnetic element, and there is a voltage change in the output of the Hall element, it is determined that the cogging locked by the locking mechanism is an adjacent cogging, and the steering wheel angle value after verification n=n ₃ , otherwise, the steering wheel angle value after verification is n=n ₂ .

When the system is powered on and the drive element starts to operate, the lock pin is driven to retract into the mounting hole. The verification method of the present invention can use the delay of the drive element to complete the verification of the steering wheel position, because the delay time is very short , The driver will not feel the freeze when using the steering wheel after the system is powered on.

The above verification method can determine the steering wheel position corresponding to the angle value at this time, which effectively guarantees the one-to-one correspondence between the steering wheel position and the wheel position after the hydraulic synchronous steering system is powered off and restarted. The steering wheel position verification is completed at the moment of power-on, simplifying the verification process Improve the calibration accuracy.

In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial value.

The above-mentioned embodiments only exemplarily illustrate the principles and effects of the present invention, and are not used to limit the present invention. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. A steering wheel position verification system is characterized in that it comprises:

   The toothed disk has a plurality of tooth grooves, and the plurality of tooth grooves are provided with magnetic elements at intervals;

   The locking mechanism is installed in the side wall of the steering wheel pipe column, and the locking mechanism is arranged corresponding to the gear plate of the steering wheel; the locking mechanism includes a lock pin with a Hall element, and the lock pin is locked when the system is powered off Into the tooth slot;

   The detection device is connected to the Hall element, and when the system is re-powered on, the steering wheel position corresponds to the angle of rotation according to the output signal of the Hall element.
2. The steering wheel position verification system according to claim 1, wherein the locking mechanism further comprises a driving element and an elastic element connecting the driving element and the lock pin, and the driving element pulls the lock when the system is powered on. The pin is placed in the side wall, and the elastic element is compressed.
3. The steering wheel position verification system according to claim 2, wherein the driving element is an electromagnetic relay, an air cylinder or a hydraulic cylinder.
4. The steering wheel position verification system according to claim 3, wherein when the driving element is an electromagnetic relay, one side of the lock pin is fixedly connected to an armature, and the electromagnetic relay is connected to the armature through an elastic element.
5. The steering wheel position verification system according to claim 3, wherein when the driving element is an air cylinder or a hydraulic cylinder, the push rod of the driving element is connected to the lock pin, and the push rod is sheathed with the Elastic element.
6. The steering wheel position verification system according to claim 2, 4 or 5, wherein the elastic element is a spring or rubber.
7. The steering wheel position verification system according to claim 1, wherein the magnetic element is a magnetic sheet.
8. A method for verifying the position of a steering wheel, characterized in that: the method for verifying a steering wheel includes the following steps:

   S1, the detection device records the steering wheel position corresponding to the angle of rotation n ₁ when the system is powered off;

   S2, determine the initial tooth groove of the gear wheel corresponding to the lock pin of the locking mechanism, and the steering wheel angle value n _{2 of} the initial tooth groove,

   S3, selecting adjacent tooth grooves of the initial tooth groove along the rotation direction of the tooth wheel, and obtaining the steering wheel rotation angle value n ₃ corresponding to the adjacent tooth groove;

   S4, the lock pin is stuck in the tooth slot of the gear wheel, the system is powered on and restarted, and the detection device re-reads the steering wheel angle value n ₁ corresponding to the steering wheel position at the last power failure and the steering wheel angle value n of the initial tooth slot _2. The steering wheel angle value n _{3 of} the adjacent tooth groove;

   S5: Detect the output signal of the Hall element, determine the tooth slot into which the lock pin is locked, and obtain the verified steering wheel angle value.
9. 8. The steering wheel position verification method according to claim 8, wherein the step of determining the tooth groove into which the locking mechanism is locked and obtaining the steering wheel angle value corresponding to the tooth groove includes:

   S51, detecting the output signal of the Hall element,

   S52: Determine whether the initial tooth slot and the adjacent tooth slot are provided with magnetic elements.
10. The steering wheel position verification method according to claim 9, characterized in that the step of determining the tooth groove into which the locking mechanism is locked and obtaining the steering wheel angle value corresponding to the tooth groove further comprises:

    S53: When the initial cogging is provided with a magnetic element and there is no voltage change in the output of the Hall element, it is determined that the cogging locked by the locking mechanism is an adjacent cogging, and the steering wheel angle value n after verification is =n ₃ ;

    S54: When the initial cogging is not provided with a magnetic element, and there is a voltage change in the output of the Hall element, it is determined that the cogging locked by the locking mechanism is an adjacent cogging, and the steering wheel angle value after verification n=n ₃ , otherwise, the steering wheel angle value after verification is n=n ₂ .

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