DEVICE FOR ASSISTING WITH POSITIONING A STEERING WHEEL OF A VEHICLE IN THE NEUTRAL STRAIGHT-RUNNING POSITION

Abstract

Disclosed is a device for assisting placement of the steering wheel of a vehicle in a neutral position of a trajectory and in a rectilinear position, device including a light source configured to project at least one light pattern defining at least one alignment direction and fixing unit adapted to allow temporary fixing of the device on the vehicle so that the light pattern is projected inside the circle delimited by the steering wheel.

Claims

1. Device for assisting the placement in the neutral position of a rectilinear trajectory of the steering wheel of a vehicle, device comprising a light source configured to project at least one light pattern defining at least one alignment direction and fixing means adapted to allow temporary attachment of the device to the vehicle so that the light source faces or is located in a plane facing the steering wheel so that the light pattern is projected at least inside the circle delimited by the steering wheel.

2. The device according to claim 1, wherein the fixing means comprise an elongated crosspiece on which the light source is fixed, the crosspiece including at each end thereof at least one finger forming an acute angle with the longitudinal direction of the crosspiece, at least one of the two fingers being movable in longitudinal translation with respect to the crosspiece and being associated with clamping means configured to allow gripping with the two fingers a part of the vehicle so as to fix the device on the part of the vehicle.

3. The device according to claim 2, wherein the two fingers are movable in longitudinal translation and each one is associated with clamping means providing elastic return of the corresponding finger towards the crosspiece.

4. The device according to claim 2, wherein the light source is movable along the crosspiece so as to adjust the longitudinal position of the light source with respect to the crosspiece.

5. The device according to claim 3, wherein the distance between the two opposite fingers is greater than or equal to 0.9 m.

6. The device according to claim 2, wherein the crosspiece has a length greater than or equal to 0.6 m.

7. The device according to claim 1, wherein the light pattern comprises at least one line segment.

8. The device according to claim 1, wherein the light source comprises at least one laser light source adapted to project at least one substantially horizontal rectilinear line of light.

9. The device according to claim 8, wherein the light source is a laser diode suitable for projecting a cross formed from two orthogonal straight lines.

10. The device according to claim 3, wherein the light source is movable along the crosspiece so as to adjust the longitudinal position of the light source with respect to the crosspiece.

11. The device according to claim 2, wherein the distance between the two opposite fingers is greater than or equal to 0.9 m.

12. The device according to claim 4, wherein the distance between the two opposite fingers is greater than or equal to 0.9 m.

13. The device according to claim 3, wherein the crosspiece has a length greater than or equal to 0.6 m.

14. The device according to claim 4, wherein the crosspiece has a length greater than or equal to 0.6 m.

15. The device according to claim 5, wherein the crosspiece has a length greater than or equal to 0.6 m.

16. The device according to claim 2, wherein the light pattern comprises at least one line segment.

17. The device according to claim 3, wherein the light pattern comprises at least one line segment.

18. The device according to claim 4, wherein the light pattern comprises at least one line segment.

19. The device according to claim 5, wherein the light pattern comprises at least one line segment.

20. The device according to claim 6, wherein the light pattern comprises at least one line segment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In addition, various other characteristics of the invention emerge from the appended description made with reference to the drawings which illustrate non-limiting forms of embodiment of the invention and where:

[0019] FIG. 1 is a schematic view of the neutral position of a vehicle steering wheel as observed in the driving position,

[0020] FIG. 2 is a schematic view explaining the parallax for an operator observing the steering wheel from outside the vehicle and having to place it in neutral position,

[0021] FIG. 3 is a schematic view of a device according to the invention,

[0022] FIG. 4 illustrates a cross-shaped alignment pattern projected into the circle delimited by a vehicle steering wheel,

[0023] FIG. 5 shows the installation of the device according to the invention in a motor vehicle,

[0024] FIG. 6 shows constructive details of the fixing means of the device according to the invention and corresponds to a schematic detail view of zone D of [FIG. 3].

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The geometry adjustment or pre-geometry operation consists in adjusting/checking the components of the running gear of a vehicle following a fault observed in trajectory and/or dynamic behavior.

[0026] This operation is either mandated by expertise, in the context of an accident and repaired vehicle, or by customer complaint, or by simple mechanical “logic” during the repair of a vehicle (for example following a mechanical operation which requires the removal/refitting/replacement of the engine subframe or the removal/refitting/replacement of an axle) or even linked to the replacement of certain worn parts such as the steering ball joints, axial ball joints, silent support blocks (defects typically noted by a technical inspection).

[0027] A badly adjusted or misaligned running gear means random vehicle trajectory, degraded handling, deviant braking, premature wear of the vehicle's rubber or tires, excessive shifting sometimes leading to a return visit to the technical inspection. A few isolated cases have also shown that the deactivation of the ESP system may be due to a heading drift. Dysfunction of the running gear or its incorrect adjustment can also induce a fault in other safety systems (active or passive) fitted to the vehicle (adaptive cruise control, white line crossing warning/lane keeping assistance, automatic emergency braking, . . . ).

[0028] This running gear adjustment is carried out in the workshop and requires specific equipment with a human worker trained in the operation but also in the equipment used.

[0029] The vehicle is placed on a lift, typically a scissor lift where the vehicle rests on its wheels. This lift is fitted with free plates for the bearing points of the wheels so as not to apply any stress on the running gear, either axial or lateral. Depending on the technology of the material used, the vehicle can also be placed on an arm lift.

[0030] There are a few preliminary steps specific to the vehicle which will not be described here, such as checking the pressure and condition of the tires, checking the loads transported unevenly distributed in the vehicle (especially in the case of lifting by a platform lift).

[0031] The operator then installs the specific geo equipment on the vehicle and/or on the lift in order to begin the work.

[0032] The detailed points of the operation will not be described because each geometry or control device for the running gear has its own implementation methods, but among all of these methods, one is common to all scenarios, that is the placement of the steering wheel V in a neutral position N.

[0033] In fact, after reading the pivot angle, caster, deviations and other characteristics, before making the necessary adjustments resulting from these preliminary measurements, the operator must hold the steering wheel of the vehicle in a very precise position, and it is in this step that device according to the invention intervenes.

[0034] Indeed, regardless of the adjustment methods or equipment used, it is always imperative to adjust a straight steering wheel position (visually, the angle of rotation given to the steering wheel must be that of a steering wheel which keeps the trajectory perfectly straight of the vehicle on a straight road, i.e. a 0 degree angle or neutral position of the steering wheel). Then, this position must be blocked with the tool provided by the equipment manufacturer of the geometry device.

[0035] As with any intervention in the workshop, even using machines, tools, instruments, there is human intervention to set up these tools or to interpret the results given by these tools. Here, in the chain of running gear adjustment operations, all the steps which the operator must carry out will not be listed.

[0036] However, in all cases, the operator must pay particular attention to a crucial point which determines the entire sequence of operations, that means the “correct” sequence of operations, because at the end of the work, during the dynamic test of the vehicle, if an anomaly is observed (and this is not so rare), he could always ask the question: was the steering wheel really straight or in the neutral position, as illustrated in FIG. 1, at the start or during adjustment. Even before putting into question the other stages of the operation, the device according to the invention aims at definitively removing the risk of incorrect positioning of the steering wheel, especially since, before removing the steering wheel lock, at the end of the operations, the device according to the invention makes it possible to check the accuracy of the position given initially and to ensure that the steering wheel has not turned during the adjustment.

[0037] With regard to positioning the steering wheel V straight (i.e. in neutral position N) and the use of the steering wheel lock B, there is no machine or mechanical device that could guide the operator in this task. The operation therefore results from an approximation which depends on the operator. In addition, the operation of locking the steering wheel in the neutral position cannot be carried out in the driving position, on the driver's seat, because the steering wheel lock B and possibly a brake pedal press, once placed, will prevent the operator from getting out of the vehicle or, if he is in the driving position, he will not be able to get out at the risk of varying the position of the steering wheel that he has just adjusted.

[0038] Therefore, as is commonly practiced in a workshop, this operation of adjusting and fitting the steering wheel lock is done from outside the vehicle, either with the door open, or with the door closed with the driver's window down. In any case, it is impossible for the operator to be facing the steering wheel and there is, when adjusting by eye, a parallax error as shown in FIG. 2.

[0039] In this step of positioning the steering wheel V in neutral position N, the operator intervenes from the outside or at best from the door sill of the vehicle (door open) with, a fortiori, this error of remanent interpretation Δ due to this parallax. Even if he tries to free himself from it by contorting himself, objectively he will never find the position of the driver sitting on his seat, occupying the natural driving position, facing the driving position. He will therefore make a steering wheel positioning error.

[0040] The invention therefore aims at avoiding this error by means of the device, according to the invention, for aiding placement in the neutral position of the straight trajectory of the steering wheel of a vehicle as illustrated in FIG. 3 and designated as a whole by the reference 1. Thus, the device 1 comprises, on the one hand, a light source 2 configured to project at least one light pattern defining at least one alignment direction and, on the other hand, fixing means 3 adapted to allow temporary fixing of the device 1 on the vehicle so that the light pattern M is projected inside the circle delimited by the steering wheel V as shown in FIG. 4.

[0041] In the present case, the fixing means 3 of the device are formed by a self-tightening telescopic bar adapted to cling to the structure of the vehicle as more particularly illustrated in detail in FIG. 5. Such a self-tightening bar comprises an elongated crosspiece 4 on which the light source 2 is fixed. The crosspiece 4 then comprises, at each one of its two ends, at least one finger 5 generally forming an acute angle with the longitudinal direction of the crosspiece 4. At least one of the two fingers 5 and preferably the two fingers 5 are each movable in longitudinal translation relative to the crosspiece and associated with clamping means configured to allow clamping, with the two fingers, part of the vehicle so as to fix the device on the latter. These clamping means can, for example, be formed by a knurled screw making it possible to block the translation of the corresponding finger 5 with respect to the crosspiece 4. According to the illustrated example, the two fingers 5 are movable in longitudinal translation with respect to the crosspiece 4. As shown in FIG. 6, each finger 5 is associated with clamping means, such as a spring 7 located inside the hollow crosspiece 4, ensuring an elastic return of the corresponding finger, in the direction of the arrow F.sub.1, towards the crosspiece or the center of the crosspiece. This embodiment makes it possible to simplify the operation of hooking or fixing the device according to the invention to the vehicle.

[0042] In addition, according to the illustrated example, the light source 2 is fitted to the crosspiece by means of a cradle 10 which itself is fixed to the crosspiece 4 via a slider 11 which is movable in translation along the crosspiece 4. The cradle 10 is connected to the slider by a pivot connection with axis A.sub.1 substantially perpendicular to the direction of extension of the crosspiece 4. Finally, the light source 2 is connected to the cradle 10 by a pivot connection with axis A.sub.2 perpendicular to axis A.sub.1. This mode of adaptation of the light source on the crosspiece 4, by means of a system whose kinematics is similar to a universal joint, allows adjustment of the position and orientation of the light source 2 relative to the projection area of the pattern M.

[0043] It should be noted that, according to the invention, the crosspiece may comprise several segments sliding one inside the other while being associated with means for locking their relative translation. This embodiment makes it possible to adjust the length of the crosspiece 4 independently of the position of the clamping fingers with respect to said crosspiece, and, therefore, to adapt the length of the crosspiece to the dimensions of the bodywork element(s) to which the device according to the invention is hooked or fixed.

[0044] According to the illustrated example, the luminous pattern is a luminous cross projected on the target surface to initially visualize a horizontal virtual line in the passenger compartment. In order to increase the efficiency of the system, this cross is produced by a laser which points the target whatever its material or color (including black) and whatever its shape, flat or complex. It constitutes a real level of light in the passenger compartment and crosses it from side to side and via the steering wheel, the desired level for the latter. Due to the projection made on the surfaces of the steering wheel, even when viewed from the outside, there can no longer be a problem of visual interpretation and there is no longer any parallax error.

[0045] It should be noted that according to one embodiment of the invention, the light source is fixed or linked to the crosspiece so as to be movable in translation relative to the crosspiece while being able to be immobilized thereon. This embodiment then makes it possible to adjust the longitudinal position of the light source and, for example, makes it possible to place it exactly in front of the steering wheel.

[0046] Also, to perfect the use, in addition to the properties of the laser beam, the device further comprises an auxiliary light source capable of illuminating the area around the target in order to allow the user to effectively visualize the near environment in which he must operate.

[0047] According to the illustrated example, the device in accordance with the invention is suitable for: [0048] maintaining the light source which produces the alignment pattern in the vehicle, with an optimal placement [0049] generating a light flux for passenger compartment lighting in addition to the alignment pattern ensure the possibility of adjusting the horizontality of the alignment pattern (orientation in rotation) [0050] allow height adjustment of the alignment pattern in the passenger compartment (tilt of the light source which produces the alignment pattern [0051] allow a movement in the passenger compartment towards the steering wheel (translational movement) of the source of the alignment pattern.

[0052] The best possible placement is that of the support from the roof of the car passing through the openings of the vehicle because they are perfectly symmetrical and guarantee a positioning base perfectly parallel to the dashboard. The rearward position of the system makes it possible, thanks to the opening angle of the laser lens, to project a light trace whose width then becomes maximum and covers the entire width of the dashboard. The crosspiece of the device, which can then be called a “ruler or roof bar” formed by the self-tightening telescopic bar described above, is clamped or hooked onto the structure of the vehicle as shown in FIG. 6.

[0053] Of course, various other embodiments of the invention can be contemplated within the scope of the appended claims.