Abstract:
An apparatus and method for use with a vehicle wheel balancing system (100) to obtain non-contact measurements of dimensions on a wheel assembly (200) secured on a spindle shaft (104), together with identification of, and distances to, operator-selected locations on various surfaces of a wheel assembly 200.
Abstract:
A procedure for calibrating a vehicle onboard sensor 202 by facilitating the placement of a calibration fixture 1 10 on a floor relative to a stationary vehicle 100 using a laser emitter 102 secured to a front steerable wheel 104 of the vehicle on the same lateral side as the vehicle onboard sensor. A beam projection axis X of the laser projector is aligned at a known orientation relative to a geometric characteristic of the vehicle 100, such that the beam projection axis X is directed over a placement location P of the calibration fixture on the floor, either inherently or by guided steering of the supporting steerable wheel. A distance between the calibration fixture 110 and a reference point associated with the vehicle 100 is measured, and a current position of the calibration fixture on the floor along the beam projection axis X is adjusted as required to position the calibration fixture for calibration of the vehicle sensor 202 at a selected distance from the reference point along the beam projection axis X,
Abstract:
A wheel balancer (10) includes a microprocessor (12) configured to receive data associated with a vehicle wheel rim and tire assembly (100) imbalance from at least one sensor, and to identify optimal correction weight plane locations (w1, w2), as well as to present the operator with the imbalance correction weight arrangement. The microprocessor (12) is further configured to control a projection display system (50) disposed to project a two-dimensional image (75) onto a surface of the vehicle wheel rim and tire assembly (100), to facilitate completion of a wheel imbalance correction procedure.
Abstract:
A wheel balancer for mounting a wheel/tire assembly has sensors (19, 21) for sensing imbalance forces, a spindle encoder (15) and a graphic signal processing chip (23). The signal processing chip also controls a CRT display (25) and controls a D.C. motor through motor control circuitry (27) and tracks spindle position from encoder (15). The balancer also includes manual inputs (29). The balancer is programmed to determine wheel imbalance from the sensors and the motor speed can be controlled to take imbalance measurements at different speeds, depending upon the conditions or desires of the operator. The use of a dc motor also facilitates dynamic braking.
Abstract:
Apparatus and method for determining the alignment positions and orientations of vehicle wheels (30, 31, 32, 33) includes a pair of measurement transducers (10, 11), each of which is mounted on separate vehicle wheels and each of which is capable of measuring the range and relative bearing to the other. Three such pairs (42, 46) (43, 45) (44, 47) of measurement transducers are mounted on the vehicle wheels (30, 31, 32, 33) in conventional locations. A computer (1) is connected to the transducers (10, 11) and programmed to compute the toe alignment measurements in a conventional manner. The computer is further programmed to compute the coordinates of the wheels (30, 31, 32, 33), in an arbitrary coordinate system, from the relative range and bearing measurements. The coordinate system may be transformed relative to the sensor center line (CL), the vehicle thrust line (Y-axis), the vehicle frame or body center line (FCL), or any desirable reference frame, thereby providing measurements of the actual wheel positions and alignment angles in the transformed coordinate system.
Abstract:
An improved vehicle alignment system (1) includes automatic angle and distance range calibration whereby various vehicle distances such as track width and wheelbase may be measured electro-optically during the alignment process. The system also includes an improved process which results in shorter measurement cycles for the sensors by utilizing an electronic shutter control. The sensors (19, 21 and 23) work in pairs, and a novel synchronization scheme is used to ensure that the emitters (25) of one sensor (19) are not radiating at the same time the emitters (25) of the other sensor (21) of that pair are radiating and to determine which emitter (25) of the pair corresponding to a sensor (19) is radiating. Reflections of the emitters (25) from nearby surfaces are discriminated from direct transmissions so that the angle of incidence is accurately determined. Moreover, determination of the angle of incidence is simplified by use of a lens (95) whose image position varies in a specific manner as the imaged object moves radially away from the axis of the lens (95). The present system is particularly suited for measuring difficult alignment measurements such as toe-out on turns electro-optically with a minimal number of sensors (19, 21, 23).
Abstract:
A continuous strip coating machine has top (18) and bottom (13) applicator rolls and a backup roll (12) adjacent the top applicator roll (18). A lift roll (38) to lift the strip (10) and thus vary the angle of wrap of strip (10) about the bottom applicator roll (13) is provided. The use of lift roll (38) in turn varies the pressure between strip (10) and roll (13) and thus the thickness of the coating applied to the strip bottom. Thickness may be measured indirectly by measuring the pressure of the strip (10) on the roll (13). Thickness may also be measured directly. Oscillations of the strip (10) in a drying oven (14) may also be sensed and compensated for. Feedback control is used with thickness measuring techniques to control coating thickness by varying angle of wrap, relative speed between the roll (13) and strip (10), and/or nip pressure between roll (13) and transfer roll (28) that transfers coating material to the roll (13).
Abstract:
A vehicle service system incorporating a pair of gimbal-mounted optical projection systems enables an operator to selectively orient each optical emitter of the optical projection system to illuminate a location on a vehicle surface in proximity to the system. Signals indicative of an orientation of each optical emitter about three-axes of rotation are received at a controller programmed with software instructions to utilize the received signals, together with known locations for the systems, to calculate a three-dimensional coordinate for the illuminated location within an established frame of reference. The controller is further programmed to utilize the calculated three-dimensional coordinate of the illuminated location as an origin point for determining one or more placement locations within the established frame of reference for ADAS sensor calibration or alignment targets.
Abstract:
A turn plate assembly for support of the steered wheels of a vehicle on a precision planar surface. The assembly includes an approach plate (102) establishing a planar surface to within an established measurement tolerance. The approach plate is coupled to a base plate (108) underlying a bearing assembly consisting of a plurality of ball bearings retained between the base plate and an underside of a rotating support disc (112). An upper surface of the rotating support disc is coplanar with an upper surface of the approach plate. Resting on the upper surface of the rotating support surface, a translational surface or mat (120) is temporarily secured in place by magnetic adhesion. During use, translational forces exerted on the translation surface or mat by a vehicle wheel assembly may overcome the magnetic adhesion, enabling the translational surface or mat to translate relative to the underlying rotating support disc.
Abstract:
A method for contactless measurements of a vehicle wheel assembly by acquiring a sequence of images as the vehicle wheel assembly moves within a projected pattern of light. Images of the vehicle wheel assembly are acquired and processed to identify the portions of the images corresponding to the wheel assembly, such as by recognition of the wheel rim edge. The identified portion of each image is cropped and a resulting point cloud of data rotational aligned by an optimization procedure to remove the effect of wheel translation and rotation between each image, as well as to identify a center of rotation and amount of rotation for each image which yields a best-fit result. Superimposing the resulting point clouds produces an image with a high density of data points on the optimally fit surfaces of the wheel assembly, which can be used to further refine the axis of rotation determination.