CN115991237A - Variable-height knuckle arm and control method thereof - Google Patents
Variable-height knuckle arm and control method thereof Download PDFInfo
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- CN115991237A CN115991237A CN202211528681.XA CN202211528681A CN115991237A CN 115991237 A CN115991237 A CN 115991237A CN 202211528681 A CN202211528681 A CN 202211528681A CN 115991237 A CN115991237 A CN 115991237A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims abstract description 37
- 239000000725 suspension Substances 0.000 claims abstract description 26
- 238000007906 compression Methods 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims abstract description 10
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The invention relates to the technical field of truck steering, and discloses a height-variable steering knuckle arm, which comprises a steering drop arm arranged on a steering engine, wherein a straight pull rod is connected through a front ball pin, the other end of the straight pull rod is connected with a rear ball pin, the rear ball pin is arranged on the steering knuckle arm through a ball pin height adjusting device, the steering knuckle arm is arranged on a steering knuckle, the steering knuckle is arranged on an axle, a displacement & angle sensor is arranged on a frame flank surface right above the axle, the measuring end of the displacement & angle sensor is fixed on an upper airfoil surface of the axle, and the ball pin height adjusting device and the displacement & angle sensor are connected with an ECU (electronic control unit). The invention also discloses a control method of the variable-height steering knuckle arm. According to the variable-height steering knuckle arm and the control method thereof, the ball pin height of the steering knuckle arm connected with the straight pull rod is controlled through the screw rod or the hydraulic oil cylinder device, so that the angle of the straight pull rod is automatically adjusted according to the compression amount of the suspension to compensate the interference influence on a steering system.
Description
Technical Field
The invention relates to the technical field of truck steering, in particular to a variable-height steering knuckle arm and a control method thereof.
Background
The automobile steering system is an important system related to the running safety of the vehicle, and the excellent steering system performance is an important guarantee for the running safety of the vehicle. The steering knuckle and the tie rod are important parts in a steering system, and the steering knuckle and the tie rod are used for converting the torsion motion around the Y axis output by a steering machine into the steering motion around a kingpin of a wheel, but when the braking operation and the loading mass of a vehicle are increased, a front suspension of the vehicle can generate certain compression, the compression process can cause interference influence on the steering transmission system, and finally, the steering wheel is deviated during braking or is skewed during straight running, and the steering suspension interference phenomenon seriously influences the driving safety and the driving comfort of the vehicle.
The interference influence of the suspension on the steering system mainly comprises two factors:
1) When the suspension is compressed, the steering machine drives the steering vertical arm and the connecting ball pin at the front end of the straight pull rod to sink, so that the angle of the straight pull rod is changed to cause the change of the X-direction distance between the steering vertical arm and the steering knuckle, and the steering knuckle is pushed (pulled) to rotate around the main pin and drive the wheels to deflect leftwards or rightwards to form deflection;
2) When the suspension is compressed, the arc height of the leaf spring can be reduced or even flattened, and as the front end of the leaf spring is fixed on the frame by the leaf spring pin and the rear end of the leaf spring is movably connected through the lifting lug, when the arc height of the leaf spring is reduced, the suspension length is prolonged, the frame can be pushed to move forwards, the steering vertical arm and the steering knuckle are enabled to be long along the X-direction distance, and the steering knuckle is pulled to rotate forwards around the main pin and drive the wheels to deflect leftwards, so that deflection is formed.
Avoiding steering suspension interference is always a difficult point for the development of trucks, especially when the suspension compression amount is large in empty and full load, and it is difficult to balance the interference phenomenon under two load states through optimization of a steering rod system.
Disclosure of Invention
The invention aims at overcoming the defects of the technology, and provides a variable-height steering knuckle arm and a control method thereof, wherein the height of a ball pin connected with a straight pull rod of the steering knuckle arm is controlled through a screw rod or a hydraulic oil cylinder device, so that the interference influence on a steering system is compensated by automatically adjusting the angle of the straight pull rod according to the compression amount of a suspension.
In order to achieve the above purpose, the steering arm with the variable height comprises a steering drop arm arranged on a steering engine, the steering drop arm is connected with a straight pull rod through a front ball pin, the other end of the straight pull rod is connected with a rear ball pin, the rear ball pin is arranged on the steering arm through a ball pin height adjusting device, the steering arm is arranged on a steering knuckle, the steering knuckle is arranged on an axle, a displacement & angle sensor is arranged on a frame flank surface right above the axle, the measuring end of the displacement & angle sensor is fixed on an upper airfoil surface of the axle in the vertical direction, and the ball pin height adjusting device and the displacement & angle sensor are connected with an ECU control unit.
Preferably, the ball pin height adjusting device is a screw rod lifting device and is installed on the knuckle arm through a base flange, and comprises a screw rod, the upper end of the screw rod is connected with the rear ball pin, and the screw rod is connected with a servo motor for driving the screw rod to move.
Preferably, the ball pin height adjusting device is a hydraulic oil cylinder device, and is installed on the knuckle arm through a base flange, and a telescopic shaft of the hydraulic oil cylinder is connected with the rear ball pin.
Preferably, the displacement & angle sensor detects displacement data and a deflection angle of the axle.
After the vehicle is loaded, the displacement and angle sensor detects the compression deformation and direction of the vehicle, the compression deformation and direction are converted into electric signals and transmitted to the ECU control unit, and the ECU control unit analyzes and calculates corresponding compensation instructions, namely the height compensation amount of the ball pin height adjusting device, through the received signals, and then adjusts the height of the rear ball pin.
Preferably, pair L, H in the unloaded state 0 、S 0 Calibrating an initial value, wherein L is the straight line distance of projection of the center points of the front ball pin and the rear ball pin of the straight pull rod on the XZ plane in an idle state, and S is 0 Is the Z-direction height difference of the center points of the front ball pin and the rear ball pin of the straight pull rod in the idle state, H 0 For the reading of the displacement sensor in the idle state, namely the Z-direction distance from the frame to the upper surface of the axle, when the vehicle is loaded with goods or braked, the displacement is obtained&Displacement reading H of angle sensor 1 The angle reading alpha, the displacement delta S of the axle relative to the steering machine in the X direction 1 ＝H 1 sin alpha, displacement when angle of straight pull rod is changed
According to the steering suspension interference compensation principle: deltaS 1 ＝△S 2 The height compensation amount of the rear ball pin>
Compared with the prior art, the invention has the following advantages:
1. the state of the suspension is monitored in real time through a displacement and angle sensor on the suspension, the hard point position of the steering mechanism is adjusted in time according to the change of the suspension, the interference influence of the suspension system on the steering system is compensated rapidly and accurately, and the driving safety is improved;
2. the height of the steering knuckle pin shaft is automatically compensated and adjusted according to the height change of the front suspension frame of the vehicle, so that the height difference of the front and rear ball pins of the steering straight pull rod is kept stable, and the phenomena of steering wheel deflection and braking deviation caused by steering suspension frame interference during emergency braking and the change of the vehicle load are avoided.
Drawings
FIG. 1 is a schematic view of a variable height knuckle arm according to the present invention;
fig. 2 is a schematic illustration of suspension changes during loading or braking.
The reference numerals of the components in the drawings are as follows:
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1, a variable-height knuckle arm comprises a knuckle arm 2 arranged on a steering engine 1, the knuckle arm 2 is connected with a straight pull rod 4 through a front ball pin 3, the other end of the straight pull rod 4 is connected with a rear ball pin 5, the rear ball pin 5 is arranged on a knuckle arm 7 through a ball pin height adjusting device 6, the knuckle arm 7 is arranged on a knuckle 8, the knuckle 8 is arranged on an axle 9, a displacement & angle sensor 10 is arranged on a frame flank surface right above the axle 9, the measuring end of the displacement & angle sensor 10 is fixed on an upper wing surface of the axle in the vertical direction, and the ball pin height adjusting device 6 and the displacement & angle sensor 10 are connected with an ECU control unit.
In this embodiment, the ball pin height adjusting device 6 is a screw rod lifting device, and is installed on the knuckle arm 7 through a base flange, and includes a screw rod 11, the upper end of the screw rod 11 is connected with the rear ball pin 5, and the screw rod 11 is connected with a servo motor 12 for driving the screw rod to move.
In addition, in other embodiments, the ball pin height adjusting device 6 may be a hydraulic cylinder device, which is mounted on the knuckle arm 7 through a base flange, and a telescopic shaft of the hydraulic cylinder is connected with the rear ball pin 5.
In the present embodiment, the displacement & angle sensor 10 detects displacement data and a yaw angle of the axle 9.
When the embodiment is used, after the vehicle is loaded, the displacement & angle sensor 10 detects the compression deformation and direction of the axle 9, converts the compression deformation and direction into an electric signal, transmits the electric signal to the ECU, and the ECU analyzes and calculates a corresponding compensation instruction, namely the height compensation amount of the ball pin height adjusting device 6 through the received signal, so as to adjust the height of the rear ball pin 5.
Specifically, as shown in FIG. 2, pair L, H in the unloaded state 0 、S 0 The initial value is calibrated, L is the straight line distance of projection of the center points of the front ball pin 3 and the rear ball pin 5 of the straight pull rod 4 on the XZ plane in the no-load state, and S is 0 Is the Z-direction height difference of the center points of the front ball pin 3 and the rear ball pin 5 of the straight pull rod 4 in the idle state, H 0 Is displaced in the idle state&The displacement reading of the angle sensor 10, i.e. the Z-distance of the frame from the upper surface of the axle 9, is obtained when the vehicle is loaded with goods or braked&Displacement reading H of angle sensor 10 1 The angle reading α, the displacement Δs of the axle 9 in X-direction relative to the steering wheel 1 1 ＝H 1 sin alpha, displacement delta when the angle of the straight pull rod is changed
According to the steering suspension interference compensation principle: deltaS 1 ＝△S 2 The height compensation amount of the rear ball pin>
According to the variable-height steering knuckle arm and the control method thereof, the state of the suspension is monitored in real time through the displacement and angle sensor on the suspension, the hard point position of the steering mechanism is adjusted in time according to the change of the suspension, the interference influence of the suspension system on the steering system is compensated rapidly and accurately, and the driving safety is improved; the height of the knuckle pin shaft is automatically compensated and adjusted according to the height change of the front suspension of the vehicle, so that the phenomena of steering wheel deflection and braking deviation caused by steering suspension interference during emergency braking and the change of the vehicle load mass are avoided.
Claims (6)
1. The utility model provides a variable height knuckle arm, is including setting up steering pendant arm (2) on steering engine (1), steering pendant arm (2) are connected with straight pull rod (4) through preceding ball round pin (3), its characterized in that: the other end of the straight pull rod (4) is connected with a rear ball pin (5), the rear ball pin (5) is installed on a knuckle arm (7) through a ball pin height adjusting device (6), the knuckle arm (7) is installed on a knuckle (8), the knuckle (8) is installed on an axle (9), a displacement & angle sensor (10) is installed on a frame flank surface right above the axle (9), the measuring end of the displacement & angle sensor (10) is fixed on an upper wing surface of the axle in the vertical direction, and the ball pin height adjusting device (6), the displacement & angle sensor (10) are connected with an ECU control unit.
2. The variable height knuckle arm of claim 1, wherein: the ball pin height adjusting device (6) is a screw rod lifting device and is installed on the knuckle arm (7) through a base flange, the ball pin height adjusting device comprises a screw rod (11), the upper end of the screw rod (11) is connected with the rear ball pin (5), and the screw rod (11) is connected with a servo motor (12) for driving the screw rod to move.
3. The variable height knuckle arm of claim 1, wherein: the ball pin height adjusting device (6) is a hydraulic oil cylinder device and is installed on the knuckle arm (7) through a base flange, and a telescopic shaft of the hydraulic oil cylinder is connected with the rear ball pin (5).
4. The variable height knuckle arm of claim 1, wherein: the displacement & angle sensor (10) detects displacement data and a deflection angle of the axle (9).
5. A control method of a variable-height knuckle arm according to claim 1, characterized by: after the vehicle is loaded, the displacement and angle sensor (10) detects the compression deformation and direction of the axle (9), converts the compression deformation and direction into an electric signal, transmits the electric signal to the ECU, and the ECU analyzes and calculates a corresponding compensation instruction, namely the height compensation amount of the ball pin height adjusting device (6), through the received signal, so as to adjust the height of the rear ball pin (5).
6. The control method of a variable-height knuckle arm according to claim 5, characterized in that: pair L, H in no-load condition 0 、S 0 Calibrating an initial value, wherein L is the straight line distance of projection of the center points of a front ball pin (3) and a rear ball pin (5) of a straight pull rod (4) on an XZ plane in an idle state, and S is 0 Is the Z-direction height difference of the center points of the front ball pin (3) and the rear ball pin (5) of the straight pull rod (4) in the no-load state, H 0 Is displaced in the idle state&The displacement reading of the angle sensor (10), namely the Z-direction distance from the frame to the upper surface of the axle (9), is obtained when the vehicle is loaded with goods or braked&Displacement reading H of angle sensor (10) 1 The angle reading alpha, the X-direction displacement delta S of the axle (9) relative to the steering gear (1) 1 ＝H 1 sin alpha, displacement when angle of straight pull rod is changed
According to the steering suspension interference compensation principle: deltaS 1 ＝△S 2 The height compensation amount of the rear ball pin>
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211528681.XA CN115991237A (en) | 2022-11-30 | 2022-11-30 | Variable-height knuckle arm and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211528681.XA CN115991237A (en) | 2022-11-30 | 2022-11-30 | Variable-height knuckle arm and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115991237A true CN115991237A (en) | 2023-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211528681.XA Pending CN115991237A (en) | 2022-11-30 | 2022-11-30 | Variable-height knuckle arm and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113580847A (en) * | 2021-06-30 | 2021-11-02 | 中国重汽集团济南动力有限公司 | Axle assembly for commercial vehicle and use method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06328925A (en) * | 1993-05-26 | 1994-11-29 | Daihatsu Motor Co Ltd | Joint structure |
| JP2003039927A (en) * | 2001-07-31 | 2003-02-13 | Satoshi Niibe | Roll center adjusting device in car suspension |
| KR20110104652A (en) * | 2010-03-17 | 2011-09-23 | 현대모비스 주식회사 | Ball joint arrangement |
| CN102848872A (en) * | 2012-10-12 | 2013-01-02 | 上海瑞尔实业有限公司 | Automobile air spring type independent suspension device with double cross arms |
| KR20170125464A (en) * | 2016-05-04 | 2017-11-15 | 현대자동차주식회사 | Device for adjusting steering hard point in the vehicle |
| CN113580847A (en) * | 2021-06-30 | 2021-11-02 | 中国重汽集团济南动力有限公司 | Axle assembly for commercial vehicle and use method thereof |
| CN215752622U (en) * | 2021-09-23 | 2022-02-08 | 比亚迪股份有限公司 | Knuckle assembly, suspension system and vehicle |
-
2022
- 2022-11-30 CN CN202211528681.XA patent/CN115991237A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06328925A (en) * | 1993-05-26 | 1994-11-29 | Daihatsu Motor Co Ltd | Joint structure |
| JP2003039927A (en) * | 2001-07-31 | 2003-02-13 | Satoshi Niibe | Roll center adjusting device in car suspension |
| KR20110104652A (en) * | 2010-03-17 | 2011-09-23 | 현대모비스 주식회사 | Ball joint arrangement |
| CN102848872A (en) * | 2012-10-12 | 2013-01-02 | 上海瑞尔实业有限公司 | Automobile air spring type independent suspension device with double cross arms |
| KR20170125464A (en) * | 2016-05-04 | 2017-11-15 | 현대자동차주식회사 | Device for adjusting steering hard point in the vehicle |
| CN113580847A (en) * | 2021-06-30 | 2021-11-02 | 中国重汽集团济南动力有限公司 | Axle assembly for commercial vehicle and use method thereof |
| CN215752622U (en) * | 2021-09-23 | 2022-02-08 | 比亚迪股份有限公司 | Knuckle assembly, suspension system and vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113580847A (en) * | 2021-06-30 | 2021-11-02 | 中国重汽集团济南动力有限公司 | Axle assembly for commercial vehicle and use method thereof |
| CN113580847B (en) * | 2021-06-30 | 2023-09-22 | 中国重汽集团济南动力有限公司 | Axle assembly for commercial vehicle and application method thereof |
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