Hall signal-based electrically-controlled tubular column position detection device

Abstract

The utility model relates to the field of steering wheel position detection, in particular to an electrically-controlled tubular column position detection device based on Hall signals. The inner sleeve is arranged on the inner side of the outer sleeve in a penetrating mode in the axial direction, and the detection assembly is used for detecting the axial displacement of the inner sleeve. The detection assembly comprises a track arranged on the inner sleeve, a Hall sensor arranged on the outer sleeve, a Hall turntable rotationally arranged on the outer sleeve and a gear arranged on the Hall turntable, the track is parallel to a central shaft of the inner sleeve, and the track is provided with a plurality of tooth grooves which are distributed in rows and are in meshed connection with the gear; the Hall sensor and the Hall turntable are eccentrically distributed, and the Hall turntable is provided with a plurality of open holes which are distributed around a central shaft and sequentially pass through the Hall sensor during rotation. According to the utility model, the accuracy of the axial position is verified in real time through a second detection mechanism independent of a motor Hall signal, safety protection measures are triggered when signal conflicts occur, and the safety and reliability of the long-stroke electrically-controlled tubular column are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steering wheel position detection field, especially a kind of electric adjusting column position detection device based on hall signal. BACKGROUND

[0002] The electric adjusting column (electric adjusting column) of existing automobile steering system is driven by motor to realize the angle and axial position adjustment of steering wheel.Among them, axial adjustment function (i.e. steering wheel telescopic) is particularly important in long-stroke electric adjusting column, and the adjustment distance is relatively large, usually more than 100mm.Currently, conventional technical scheme relies on the hall sensor signal in motor, and the controller calculates the rotation turns of motor by detecting the pulse number and frequency of hall signal, and then deduces the axial position of column.

[0003] However, the prior art has the following shortcomings:

[0004] 1. Single point failure risk: only rely on single hall signal source, lack of redundant verification, cannot detect signal anomaly.

[0005] 2. Accumulated error cannot be eliminated: after long-term use, motor gear wear, signal interference or hall element failure may cause signal loss or error accumulation, leading to controller misjudgment position.

[0006] 3. Passive detection mechanism: controller can only judge the abnormality (such as signal interruption) by logic, but cannot actively verify the authenticity of signal.

[0007] 4. Long-stroke scene defects: under long-stroke adjustment, small error will be amplified, and existing technology cannot meet the requirements of high precision and safety, if the axial position calculation of long-stroke electric adjusting column is wrong (such as misjudgment as locked), it may cause steering wheel to move unexpectedly during driving, affect the driver control, especially in the high safety requirement of automatic driving mode, the risk is higher. INVENTION CONTENTS

[0008] The utility model aims at the problems in the background art, proposes a kind of electric adjusting column position detection device based on hall signal, verifies the axial position accuracy in real time by the second detection mechanism independent of motor hall signal, and triggers safety protection measures when signal conflict, improves the safety and reliability of long-stroke electric adjusting column.

[0009] The utility model discloses a technical scheme, a kind of electrically adjustable pipe column position detection device based on hall signal, including outer sleeve tube, the inner sleeve tube being axially arranged in the inside of outer sleeve tube and the detection component of detecting the axial displacement of inner sleeve tube;Detection component includes the track being set on inner sleeve tube, the hall sensor being set on outer sleeve tube, the hall turntable being rotationally arranged on outer sleeve tube and the gear being set on hall turntable, track is parallel with the central axis of inner sleeve tube, track has multiple tooth grooves being distributed in row and being meshed with gear, hall sensor and hall turntable eccentric distribution, hall turntable has multiple openings being distributed around central axis and sequentially passing through hall sensor when rotating.

[0010] Preferably, the outer peripheral surface of the inner sleeve tube has a groove parallel to the central axis, and the track is installed in the groove.

[0011] Preferably, the hall sensor has a through hole, and a bolt is arranged in the through hole and is screwed with the outer sleeve tube.

[0012] Preferably, the opening is a circular hole or a triangular hole.

[0013] Preferably, the hall turntable comprises a turntable part and a connecting rod part coaxially connected to one side of the end surface of the turntable part, and the opening is located on the turntable part.

[0014] Preferably, the connecting rod part has a key groove at an end away from the turntable part, and the gear has a key part matched with the key groove.

[0015] Preferably, a bearing is installed on the outer sleeve tube, and the connecting rod part is installed on the inner ring of the bearing.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] The utility model discloses a second detection mechanism independent of the motor hall signal, verifies the axial position accuracy in real time, and triggers the safety protection measures when the signal conflicts, improves the safety and reliability of the long-stroke electrically adjustable pipe column. When the inner sleeve tube moves axially, the hall sensor outputs a square wave signal with high and low levels alternately. The vehicle controller synchronously acquires the motor hall signal and the hall square wave signal of the embodiment, respectively calculates the theoretical displacement and the actual displacement of the inner sleeve tube, compares the results of the two, and if the deviation exceeds the threshold value, it is determined that the steering wheel adjustment is abnormal. If the deviation is within the threshold range, the steering wheel adjustment process is normal. In addition, the vehicle controller can also monitor the motor operating state. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is the structural schematic diagram of the embodiment of the utility model;

[0019] Fig. 2 It is the partial structure section view of hall sensor detection principle;

[0020] Fig. 3Exploded view of the structure of Hall sensor, bolt, Hall disk, spline gear and bearing.

[0021] Reference numerals: 1. Outer sleeve; 2. Inner sleeve; 3. Track; 4. Hall sensor; 5. Bolt; 6. Hall turntable; 61. Turntable part; 611. Opening; 62. Connecting rod part; 621. Keyway; 7. Gear; 8. Bearing. Detailed Implementation

[0022] Example 1

[0023] like Figs. 1-3 As shown in this embodiment, an electronically controlled servo motor position detection device based on Hall signals includes an outer sleeve 1, an inner sleeve 2 axially passing through the inner side of the outer sleeve 1, and a detection assembly for detecting the axial displacement of the inner sleeve 2. The detection assembly includes a track 3 mounted on the inner sleeve 2, a Hall sensor 4 mounted on the outer sleeve 1, a Hall effect disc 6 rotatably mounted on the outer sleeve 1, and a gear 7 mounted on the Hall effect disc 6. The Hall sensor 4 has a through hole through which a bolt 5 threadedly connects to the outer sleeve 1 is inserted. The Hall sensor 4 can be mounted on the outer sleeve 1 by tightening the bolt 5. The outer circumference of the outer sleeve 1 has an opening for the Hall effect disc 6 to pass through. The outer circumference of the inner sleeve 2 has a groove parallel to the central axis, and the track 3 is installed in the groove, thereby isolating it from the existing motor.

[0024] like Fig. 2 As shown, track 3 is parallel to the central axis of inner sleeve 2. Track 3 has multiple toothed grooves arranged in a row and meshing with gear 7. Hall sensor 4 is eccentrically distributed with Hall disk 6. Hall disk 6 has multiple openings 611 distributed around its central axis and passing sequentially through Hall sensor 4 during rotation. The openings 611 are circular holes, evenly distributed around the central axis of Hall disk 6. When Hall disk 6 rotates, the multiple openings 611 pass sequentially through Hall sensor 4, changing the surrounding magnetic field and causing the output of Hall sensor 4 to be either high or low. Therefore, Hall sensor 4 outputs a square wave signal with alternating high and low levels, which is transmitted to the vehicle controller. Alternatively, the openings 611 can also be triangular holes, or the openings 611 can be unequally spaced, enhancing recognition robustness through waveform characteristics.

[0025] The embodiment verifies the axial position accuracy in real time through a second detection mechanism independent of the motor Hall signal, triggers safety protection measures when the signals conflict, and improves the safety and reliability of the long-stroke electric adjustment tube column. When the inner sleeve 2 moves axially, the gear 7 is driven to rotate by the track 3, the gear 7 drives the Hall turntable 6 to rotate, and the multiple openings 611 alternately pass through the Hall sensor 4, and the Hall sensor 4 outputs a square wave signal with high and low levels alternately. The vehicle controller synchronously acquires the motor Hall signal and the Hall square wave signal of the embodiment, calculates the theoretical displacement of the inner sleeve 2 according to the number of motor Hall pulses under the existing technology, calculates the actual displacement according to the number of redundant Hall pulses of the Hall square wave signal, compares the results of the two, and if the deviation exceeds the threshold value (such as ±2mm), it is determined that the steering wheel adjustment is abnormal. If the deviation is within the threshold range, the steering wheel adjustment process is normal, the vehicle exits the automatic driving mode, and the manual mode is forced to switch, and an alarm prompt is given. In addition, the vehicle controller can monitor the motor operating state, and judge whether the motor is stuck or the speed is abnormal through the frequency stability (such as period fluctuation) of the square wave signal.

[0026] When the driver controls the hidden steering wheel, the steering column moves axially to the lowermost end, at which time the redundant Hall number determines whether the column moves axially, and the Hall number is set by the controller. When it is detected that the Hall number reaches the limit value, it indicates that the column has entered the retracted state, that is, the steering wheel connection is disconnected and enters the manual driving mode, and if the Hall number does not reach the set value, the automatic driving mode cannot be entered.

[0027] Embodiment two

[0028] As shown in Figs. 1-3 , the Hall signal-based electric adjustment tube column position detection device proposed in the embodiment, compared with embodiment one, in the embodiment, the Hall turntable 6 includes a turntable part 61 and a connecting rod part 62 coaxially connected to one side end surface of the turntable part 61, and the openings 611 are located on the turntable part 61, and a plurality of openings 611 are distributed around the center axis of the turntable part 61.

[0029] As shown in Fig. 3 , the end of the connecting rod part 62 away from the turntable part 61 has a key groove 621, and the gear 7 has a key part adapted to the key groove 621. The gear 7 can be inserted in interference at the key groove 621, and is installed firmly.

[0030] As shown in Fig. 2 and Fig. 3 , the outer sleeve 1 is provided with a bearing 8, and the connecting rod part 62 is installed on the inner ring of the bearing 8. When installing the Hall turntable 6, the gear 7 and the bearing 8, first press the outer ring of the bearing 8 into the reserved hole on the outer sleeve 1, then press the connecting rod part 62 onto the inner ring of the bearing 8, and finally press the gear 7 from the end of the connecting rod part 62. When the gear 7 rotates, the bearing 8 is used to realize the stable rotation of the Hall turntable 6.

[0031] The embodiment guarantees the stability of the rotation of the Hall rotating disc 6 through the bearing 8, and the connection of the connecting rod part 62 and the gear 7 is realized through the key groove 621 and the key part, which is convenient to connect.

[0032] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to this, and various changes can be made within the knowledge range possessed by the technical personnel in the technical field without departing from the purpose of the utility model.

Claims

1. A device for detecting the position of an electrically slewing tube column based on Hall signals, characterized in that, The device includes an outer sleeve (1), an inner sleeve (2) axially inserted inside the outer sleeve (1), and a detection assembly for detecting the axial displacement of the inner sleeve (2). The detection assembly includes a track (3) on the inner sleeve (2), a Hall sensor (4) on the outer sleeve (1), a Hall turntable (6) rotatably mounted on the outer sleeve (1), and a gear (7) mounted on the Hall turntable (6). The track (3) is parallel to the central axis of the inner sleeve (2). The track (3) has multiple toothed grooves arranged in a row and meshing with the gear (7). The Hall sensor (4) is eccentrically distributed with the Hall turntable (6). The Hall turntable (6) has multiple openings (611) arranged around the central axis and passing through the Hall sensor (4) sequentially during rotation.

2. The electrically scalable tube position detection device based on Hall signal according to claim 1, characterized in that, The outer circumferential surface of the inner sleeve (2) has a groove parallel to the central axis, and the track (3) is installed in the groove.

3. The electrically scalable tube position detection device based on Hall signal according to claim 1, characterized in that, The Hall sensor (4) has a through hole, through which a bolt (5) is threaded to the outer sleeve (1).

4. The electrically scalable tube position detection device based on Hall signal according to claim 1, characterized in that, The opening (611) is either a round hole or a triangular hole.

5. The electrically scalable tube position detection device based on Hall signal according to claim 1, characterized in that, The Hall effect turntable (6) includes a turntable part (61) and a connecting rod part (62) coaxially connected to one end face of the turntable part (61), and an opening (611) is located on the turntable part (61).

6. The electrically scalable tube position detection device based on Hall signal according to claim 5, characterized in that, The connecting rod (62) has a keyway (621) at the end away from the turntable (61), and the gear (7) has a key that matches the keyway (621).

7. The electrically scalable tube position detection device based on Hall signal according to claim 5, characterized in that, The outer tube (1) is fitted with a bearing (8), and the connecting rod (62) is mounted on the inner ring of the bearing (8).

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