Vehicle steering angle detection device, vehicle steering system and vehicle

Abstract

The utility model provides a vehicle steering angle detection device, a vehicle steering system and a vehicle. The device comprises a driving gear, a driven gear, a sensor assembly and a steering shaft, the tooth number of the master gear is different from that of the slave gear, and the sensor assembly comprises a first angle detection module and a second angle detection module; the driving gear is coaxially connected with the steering shaft, and the driving gear is meshed with the driven gear and drives the driven gear to rotate; the first angle detection module is arranged on one side of the main gear and used for detecting the steering angle of the main gear. The second angle detection module is arranged on one side of the slave gear and used for detecting the steering angle of the slave gear. According to the device, the structure of the vehicle steering angle detection device is simplified, and the detection precision is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to a vehicle steering angle detection device, a vehicle steering system and a vehicle. Background Art

[0002] The automobile steering system is a mechanical system used to control the steering of the vehicle, and its components usually include steering tube, steering wheel, steering shaft and steering gear. Compared with the Electric Power Steering (EPS) system, the Steering-By-Wire (SBW) system eliminates the mechanical connection between the steering wheel and the steering wheel, and the steering is completely achieved by electric energy, becoming an important development direction of modern automobile steering systems.

[0003] In the SBW system, the steering wheel steering angle directly affects driving accuracy and safety. At present, a linear displacement sensor and an eddy current sensor are provided in the steering wheel steering angle detection device. Specifically, when the outer rotor motor is running, the thread groove on the motor drives the slider to move, the linear displacement sensor is used to detect the displacement of the slider, the eddy current sensor is used to detect the rotor angle, and the control unit is used to determine the absolute steering angle of the steering wheel by combining the rotor angle and the displacement of the slider.

[0004] However, the structure of the above detection device is relatively complex, and the detection accuracy of the absolute steering angle of the steering wheel needs to be further improved. Utility Model Content

[0005] The present application provides a vehicle steering angle detection device, a vehicle steering system and a vehicle, so as to solve the problem that the vehicle steering angle detection device in the prior art has a complex structure and low detection accuracy.

[0006] In a first aspect, the present application provides a vehicle steering angle detection device, comprising: a main gear, a slave gear, a sensor assembly and a steering shaft; the number of teeth of the main gear is different from the number of teeth of the slave gear, and the sensor assembly comprises a first angle detection module and a second angle detection module;

[0007] The main gear is coaxially connected to the steering shaft, and the main gear meshes with the slave gear and drives the slave gear to rotate;

[0008] The first angle detection module is arranged at one side of the main gear and is used to detect the steering angle of the main gear;

[0009] The second angle detection module is arranged at one side of the slave gear and is used for detecting the steering angle of the slave gear.

[0010] In some embodiments, the accuracy of the first angle detection module is higher than the accuracy of the second angle detection module.

[0011] In some embodiments, the first angle detection module is a magnetoresistive sensor chip, and the second angle detection module is a Hall sensor chip.

[0012] In some embodiments, the first angle detection module is a tunneling magnetoresistive sensor chip or a giant magnetoresistive sensor chip.

[0013] In some embodiments, the device further comprises a motor comprising an outer rotor and an inner stator coaxially arranged;

[0014] The steering shaft is coaxially connected with the outer rotor; the slave gear is rotationally connected with the inner stator.

[0015] In some embodiments, the sensor assembly further comprises a housing and a circuit board;

[0016] The housing is fixedly connected to the inner stator, and the slave gear is rotationally connected to the housing;

[0017] The circuit board is connected to the housing, and the first angle detection module and the second angle detection module are arranged on the circuit board;

[0018] The sensor assembly also includes a fixing bracket;

[0019] The fixing bracket has an inserting portion, the shell has a card slot, and the inserting portion is inserted into the card slot.

[0020] In some embodiments, one end of the steering shaft is coaxially connected to the main gear through a connecting shaft, a first magnet is provided on the main gear, the first magnet is located at the axis center of the main gear, and the first angle detection module is arranged opposite to the first magnet;

[0021] A second magnet is arranged on the slave gear, the second magnet is located at the axis center of the slave gear, and the second angle detection module is arranged opposite to the second magnet.

[0022] In some embodiments, the gear ratio of the master gear to the slave gear is 5:4.

[0023] In a second aspect, the present application provides a vehicle steering system, comprising the vehicle steering angle detection device in the first aspect and any one of the embodiments of the first aspect.

[0024] In a third aspect, the present application provides a vehicle, comprising the vehicle steering angle detection device in the first aspect and any one embodiment of the first aspect.

[0025] The vehicle steering angle detection device, vehicle steering system and vehicle provided by the present application are capable of determining the absolute steering angle of the steering wheel based on the steering angle of the main gear and the steering angle of the slave gear by providing a main gear coaxially connected to the steering shaft, a slave gear meshing with the main gear, a first angle detection module for detecting the steering angle of the main gear, and a second angle detection module for detecting the steering angle of the slave gear, thereby achieving the effect of simplifying the structure of the steering angle detection device and improving the detection accuracy of the steering wheel steering angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of a vehicle steering angle detection device provided in one embodiment of the present application;

[0028] Figure 2 for Figure 1 A front view of a vehicle steering angle detection device;

[0029] Figure 3 for Figure 1 A schematic diagram of the assembly relationship between the main gear and the slave gear of the vehicle steering angle detection device;

[0030] Figure 4 for Figure 2 Middle AA section view;

[0031] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0032] Figure 6 A schematic diagram of the angle change of a main gear and a slave gear provided in one embodiment of the present application.

[0033] Reference numerals:

[0034] 10. Steering shaft;

[0035] 11. Connecting shaft;

[0036] 20. Main gear;

[0037] 21. The first magnet;

[0038] 22. Mounting parts;

[0039] 30. From the gear;

[0040] 31. Second magnet;

[0041] 40. Sensor assembly;

[0042] 41. A first angle detection module;

[0043] 42. A second angle detection module;

[0044] 43. Shell;

[0045] 44. Circuit board;

[0046] 45. Fixed bracket;

[0047] 451. Fixed position;

[0048] 46. ​​Connectors;

[0049] 50. Outer rotor;

[0050] 51. Internal stator. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances. For example, without departing from the scope of this document, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0053] It should be further understood that the terms “comprises” and “includes” indicate the existence of features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the existence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups.

[0054] The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". An exception to this definition will only occur when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0055] In the SBW system, the steering wheel steering angle directly affects driving accuracy and safety. At present, a linear displacement sensor and an eddy current sensor are usually provided in a steering wheel steering angle detection device. Specifically, when the outer rotor motor is running, the thread groove on the motor drives the slider to move, the linear displacement sensor is used to detect the displacement of the slider, the eddy current sensor is used to detect the rotor angle, and the control unit is used to determine the absolute steering angle of the steering wheel in combination with the rotor angle and the displacement of the slider. Here, it should be understood that the absolute steering angle of the steering wheel is the actual angle value describing the steering wheel turning from the center position to one side, without considering the direction of rotation.

[0056] However, the structure of the above detection device is relatively complex, and the detection accuracy of the absolute steering angle of the steering wheel is low, which affects driving accuracy and driving safety.

[0057] In view of the above problems, the present application proposes a vehicle steering angle detection device, a vehicle steering system and a vehicle. In the device, a main gear coaxially connected to the steering wheel shaft, a slave gear meshing with the main gear, a first angle detection module for detecting the steering angle of the main gear, and a second angle detection module for detecting the steering angle of the slave gear are provided. According to the steering angles of the main gear and the slave gear, the absolute steering angle of the steering wheel is determined by calculating the vernier algorithm, and the thread groove and slider structure on the outer rotor motor are eliminated, so that the design of the steering angle detection device is more compact, its structure is simplified, and the detection accuracy of the steering angle is improved.

[0058] The technical solution of the present application is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0059] Figure 1 This is a schematic diagram of the structure of a vehicle steering angle detection device provided in one embodiment of the present application. Figure 1 As shown, the steering angle detection device of the embodiment of the present application is arranged in the steering structure, and the steering shaft 10 in the figure is the steering wheel shaft.

[0060] Figure 2 for Figure 1 A front view of the vehicle steering angle detection device. Figure 2 As shown, the vehicle steering angle detection device of this embodiment includes: a main gear 20 , a slave gear 30 , a sensor assembly 40 and a steering shaft 10 .

[0061] The number of teeth of the main gear 20 is different from the number of teeth of the slave gear 30 . The sensor assembly 40 includes a first angle detection module 41 and a second angle detection module 42 .

[0062] Figure 3 for Figure 1Schematic diagram of the assembly relationship between the main gear 20 and the slave gear 30 of the vehicle steering angle detection device. Figure 3 As shown, the main gear 20 is coaxially connected to the steering shaft 10 , and the main gear 20 is meshed with the slave gear 30 and drives the slave gear 30 to rotate.

[0063] Figure 4 for Figure 2 Middle AA section view. Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the figure. Figure 4 , Figure 5 As shown, the first angle detection module 41 is disposed on one side of the main gear 20 for detecting the steering angle of the main gear 20 ; the second angle detection module 42 is disposed on one side of the slave gear 30 for detecting the steering angle of the slave gear 30 .

[0064] In the vehicle steering angle detection device provided by the present embodiment, the steering shaft 10 is coaxially connected to the main gear 20. By providing a first angle detection module 41 for detecting the steering angle of the main gear 20 and a second angle detection module 42 for detecting the steering angle of the slave gear 30, and the main gear 20 and the slave gear 30 have different numbers of teeth, the vernier algorithm can be used to calculate the absolute steering angle of the steering wheel, the linear displacement sensor, the thread groove and the slider structure on the outer rotor 50 motor are eliminated, the structure of the vehicle steering angle detection device is simplified, and the detection accuracy is improved.

[0065] In some embodiments, the accuracy of the first angle detection module 41 is higher than the accuracy of the second angle detection module 42 .

[0066] Specifically, the steering angle of the main gear 20 needs to be accurately detected, and the steering angle of the slave gear 30 can accurately determine the range of the steering wheel steering angle. Therefore, the accuracy of the second angle detection module 42 can be lower than the accuracy of the first angle detection module 41.

[0067] In some embodiments, the first angle detection module 41 is a magnetoresistive sensor chip, and the second angle detection module 42 is a Hall sensor chip.

[0068] Optionally, the first angle detection module 41 is a tunneling magnetoresistive sensor chip or a giant magnetoresistive sensor chip.

[0069] This embodiment uses a magnetoresistive sensor chip instead of an eddy current sensor to measure the steering angle of the main gear 20, that is, the rotor angle, and uses a Hall sensor chip instead of a linear displacement sensor to detect the angle of the slave gear 30. On the basis of the existing structure, the eddy current sensor is eliminated, and a magnetoresistive sensor chip is used to detect the steering angle of the main gear 20, and a Hall sensor chip is used to detect the steering angle of the slave gear 30, so that the structure of the steering angle detection device is more compact and the size of the device is reduced.

[0070] In some embodiments, the vehicle steering angle detection device further includes a motor, which includes an outer rotor 50 and an inner stator 51 which are coaxially arranged.

[0071] refer to Figure 4 The steering shaft 10 is coaxially connected to the outer rotor 50 ; the slave gear 30 is rotationally connected to the inner stator 51 .

[0072] In some embodiments, one end of the steering shaft 10 is coaxially connected to the main gear 20 through a connecting shaft 11. The main gear 20 is provided with a first magnet 21, which is located at the axial center of the main gear 20. The first angle detection module 41 is arranged opposite to the first magnet 21.

[0073] The slave gear 30 is provided with a second magnet 31 . The second magnet 31 is located at the axis center of the slave gear 30 . The second angle detection module 42 is disposed opposite to the second magnet 31 .

[0074] Specifically, in addition to being connected to the outer rotor 50, the steering shaft 10 also passes through the inner stator 51, extends to the tail of the motor, and is then coaxially connected to the main gear 20 through the connecting shaft 11. The main gear 20 and the steering shaft 10 can be press-fitted onto the connecting shaft 11.

[0075] refer to Figure 5 The first magnet 21 is press-fitted at the axis position of the main gear 20. In this way, when the steering wheel is turned, the first magnet 21 rotates synchronously with the outer rotor 50, and the rotation angle of the first magnet 21 is consistent with the rotation angle of the outer rotor 50 and the steering shaft 10. The first angle detection module 41 can detect the motor angle in real time. It should be understood that the first angle detection module 41 is mainly used for motor control and measurement of the steering angle of the main gear 20.

[0076] The first magnet 21 can be press-fitted on the axis of the main gear 20 through the mounting member 22, and the outer side of the mounting member 22 can be covered with a copper sleeve or an aluminum sleeve. The first magnet 21, the mounting member 22, the copper sleeve or the aluminum sleeve and the main gear 20 can be injection molded into one piece.

[0077] Specifically, when the steering shaft 10 rotates, the main gear 20 is driven to rotate, and the main gear 20 drives the slave gear 30 to rotate.

[0078] Continue to refer Figure 5 A second magnet 31 is injection molded on the gear 30, and a second angle detection module 42 is arranged opposite to the second magnet 31. The second angle detection module 42 is arranged on a circuit board 44, and can detect the angle of rotation of the magnet on the gear 30 and output an electrical signal.

[0079] In some embodiments, the sensor assembly 40 further includes a housing 43 and a circuit board 44 .

[0080] The housing 43 is fixedly connected to the inner stator 51 , and the slave gear 30 is rotationally connected to the housing 43 ; the circuit board 44 is connected to the housing 43 , and the first angle detection module 41 and the second angle detection module 42 are disposed on the circuit board 44 .

[0081] refer to Figure 2 The housing 43 is fixedly connected to the inner stator 51 by three bolts. The circuit board 44 is connected to the housing 43 by four bolts.

[0082] In some embodiments, the sensor assembly 40 further includes a connector 46 , which is fixed on the circuit board 44 for transmitting signals.

[0083] In some embodiments, the sensor assembly 40 further includes a fixing bracket 45; the fixing bracket 45 has a plug-in portion, and the housing 43 has a card slot, and the plug-in portion is plugged into the card slot.

[0084] Specifically, the slave gear 30 is assembled into the hole of the housing 43, and the plug-in portion of the fixing bracket 45 is plugged into the slot of the housing 43, so that the slave gear 30 is fixed between the housing 43 and the fixing bracket 45, and the slave gear 30 rotates in the hole of the housing 43 and does not separate from the housing 43. Among them, the plug-in portion of the fixing bracket 45 is plugged into the slot of the housing 43, and the fixing position 451 is as shown in FIG. Figure 2 shown.

[0085] In some embodiments, the gear ratio of the main gear 20 to the slave gear 30 is 5:4. For example, the main gear 20 has 10 teeth and the slave gear 30 has 8 teeth. Alternatively, the main gear 20 has 15 teeth and the slave gear 30 has 12 teeth.

[0086] Since the number of teeth of the main gear 20 and the slave gear 30 is different, the steering angle of the slave gear 30 detected by the second angle detection module 42 can be used with the steering angle of the main gear 20 detected by the first angle detection module 41 to calculate the absolute steering wheel angle.

[0087] The gear ratio of the main gear 20 and the slave gear 30 is set to 5:4, which can be used for angle detection of ±720° and for detection in the currently common angle range of ±540°. The redundant setting of the detection device further improves the reliability of the steering wheel absolute angle detection.

[0088] Optionally, the steering wheel steering angle range includes -720° to -433°, -432° to -361°, -360° to -145°, -144° to -1°, 0° to 143°, 144° to 359°, 360° to 431° and 432° to 720°.

[0089] Figure 6Schematic diagram of the angle change of the main gear 20 and the slave gear 30 provided in one embodiment of the present application. Figure 6 As shown, the gear ratio of the main gear 20 to the slave gear 30 is 5:4. Within the angle range of -720° to 720°, the main gear 20 rotates 4 circles, and the slave gear 30 rotates 5 circles.

[0090] Taking a part of the angles in the range of -720° to -360° as an example, the relationship between the rotation angles of the master gear 20 and the slave gear 30 is shown in Table 1. The SETUP value is used to determine the range of the steering wheel steering angle.

[0091] When the gear ratio of the main gear 20 to the slave gear 30 is 5:4, SETUP=the steering angle of the main gear 20-0.8 the steering angle of the slave gear 30. It should be understood that the steering angle of the main gear 20 and the steering angle of the slave gear 30 are both detection angles.

[0092] Table 1 Relationship between the rotation angles of the main gear 20 and the slave gear 30

[0093] angle Main - actual rotation angle From - Actual rotation angle Main-detection angle From-Detection Angle SETUP value -720 0 0 0 0 0 -719 1 1.25 1 1.25 0 -718 2 2.5 2 2.5 0 -717 3 3.75 3 3.75 0 -716 4 5 4 5 0 -715 5 6.25 5 6.25 0 ... ... ... ... ... ... -436 284 355 284 355 0 -435 285 356.25 285 356.25 0 -434 286 357.5 286 357.5 0 -433 287 358.75 287 358.75 0 -432 288 360 288 0 288 -431 289 361.25 289 1.25 288 -430 290 362.5 290 2.5 288 -429 291 363.75 291 3.75 288 -428 292 365 292 5 288 -427 293 366.25 293 6.25 288 ... ... ... ... ... ... -366 354 442.5 354 82.5 288 -365 355 443.75 355 83.75 288 -364 356 445 356 85 288 -363 357 446.25 357 86.25 288 -362 358 447.5 358 87.5 288 -361 359 448.75 359 88.75 288 -360 360 450 0 90 -72

[0094] according to Figure 6 As can be seen from the data in Table 1, the SETUP values ​​include 0, 288, -72, 216, -144, 144, -216 and 72. The corresponding relationship between the SETUP value and the steering wheel steering angle range is shown in Table 2.

[0095] Table 2 Correspondence between SETUP value and steering wheel angle range

[0096] SETUP value Steering wheel angle range 0 -720°～-433° 288 -432°～-361° -72 -360°～-145° 216 -144°～-1° -144 0°～143° 144 144°～359° -216 360°～431° 72 432°～720°

[0097] It should be understood that the range of the above-mentioned steering wheel steering angle interval includes both end point values. For example, when the steering wheel steering angle is -720° or -433°, the corresponding SETUP value is 0.

[0098] Theoretically, within the ±720° angle range, each SETUP value is specific, but the SETUP value calculated in practice may deviate from the theoretical value. In this case, you can select the theoretical value that is closer to the actual value. For example, the SETUP value calculated in practice is 15, which is closer to the theoretical SETUP value of 0, which means that the steering wheel steering angle is in the range of -720° to -433°. For another example, the SETUP value calculated in practice is 75, which is closer to the theoretical SETUP value of 72, which means that the steering wheel steering angle is in the range of 432° to 720°.

[0099] For example, the angle data of the main gear 20 is 356°, and the angle data of the slave gear 30 is 86°, then SETUP=356-0.8×86=287.2, which is closer to the theoretical SETUP value of 288. Therefore, the steering wheel steering angle is determined to be in the range of -432° to -361°, -432°+356°=-76°, and the absolute steering angle of the steering wheel is -76°.

[0100] The present application provides a vehicle steering system, comprising a vehicle steering angle detection device in any of the aforementioned device embodiments.

[0101] The present application also provides a vehicle, comprising the vehicle steering angle detection device in any of the aforementioned device embodiments.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle steering angle detection device, characterized in that: The device comprises: a main gear, a slave gear, a sensor assembly and a steering shaft; the number of teeth of the main gear is different from the number of teeth of the slave gear, and the sensor assembly comprises a first angle detection module and a second angle detection module; The main gear is coaxially connected to the steering shaft, and the main gear meshes with the slave gear and drives the slave gear to rotate; The first angle detection module is arranged at one side of the main gear and is used to detect the steering angle of the main gear; The second angle detection module is disposed at one side of the slave gear and is used to detect the steering angle of the slave gear.

2. The device according to claim 1, characterized in that The accuracy of the first angle detection module is higher than the accuracy of the second angle detection module.

3. The device according to claim 2, characterized in that The first angle detection module is a magnetoresistive sensor chip, and the second angle detection module is a Hall sensor chip.

4. The device according to claim 3, characterized in that The first angle detection module is a tunneling magnetoresistive sensor chip or a giant magnetoresistive sensor chip.

5. The device according to any one of claims 1 to 4, characterized in that: The device also includes a motor, which includes an outer rotor and an inner stator arranged coaxially; The steering shaft is coaxially connected to the outer rotor; the slave gear is rotationally connected to the inner stator.

6. The device according to claim 5, characterized in that The sensor assembly also includes a housing and a circuit board; The housing is fixedly connected to the inner stator, and the slave gear is rotationally connected to the housing; The circuit board is connected to the housing, and the first angle detection module and the second angle detection module are arranged on the circuit board; The sensor assembly also includes a fixing bracket; The fixing bracket has an inserting portion, the housing has a slot, and the inserting portion is inserted into the slot.

7. The device according to any one of claims 1 to 4, characterized in that: One end of the steering shaft is coaxially connected to the main gear through a connecting shaft, a first magnet is provided on the main gear, the first magnet is located at the axis center of the main gear, and the first angle detection module is arranged opposite to the first magnet; The slave gear is provided with a second magnet, the second magnet is located at the axial center of the slave gear, and the second angle detection module is arranged opposite to the second magnet.

8. The device according to any one of claims 1 to 4, characterized in that: The gear ratio between the main gear and the slave gear is 5:

4.

9. A vehicle steering system, characterized in that: The steering system comprises the vehicle steering angle detection device according to any one of claims 1-8.

10. A vehicle, characterized in that: The vehicle comprises the vehicle steering angle detection device according to any one of claims 1-8.

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