Abstract: A vehicle alignment sensor system includes a first sensor assembly for measuring at least a first angle with respect to a fixed reference, that angle being related in a predetermined manner to an alignment angle of a vehicle whose alignment is to be measured, and a second sensor assembly for mounting in a known geometrical relationship to a wheel of a vehicle whose alignment is to be measured. The first sensor assembly has at least one detector, and the second sensor assembly has at least a pair of emitters in fixed geometrical relationship with respect to each other. The detector is capable of measuring the apparent geometrical relationship of the pair of emitters to determine a relative alignment angle of the vehicle, so that a true alignment angle of the vehicle is determinable from the first angle and the relative alignment angle. A calibration method using the present system is also disclosed.

Abstract: Apparatus and method for determining the alignment positions and orientations of vehicle wheels includes optical targets mounted on the wheels. A pair of cameras or other image sensing devices on each side of the vehicle are used to obtain images of the various optical targets and a computer is responsive to the images of the targets to determine values of wheel alignment parameters of the vehicle. The surface on which the wheels are disposed may be an automotive lift or a stationary runway. One camera on each side is directed at the target on the corresponding front wheel and the other camera on each side is directed at the target on the corresponding rear wheel. When used with a rack, the major axis of the field of view of each camera is disposed vertically. When used with a stationary runway, the major axis of the field of view of each camera is disposed horizontally.

Abstract: A vehicle alignment sensor system includes a first sensor assembly for measuring at least a first angle with respect to a fixed reference, that angle being related in a predetermined manner to an alignment angle of a vehicle whose alignment is to be measured, and a second sensor assembly for mounting in a known geometrical relationship to a wheel of a vehicle whose alignment is to be measured. The first sensor assembly has at least one detector, and the second sensor assembly has at least a pair of emitters in fixed geometrical relationship with respect to each other. The detector is capable of measuring the apparent geometrical relationship of the pair of emitters to determine a relative alignment angle of the vehicle, so that a true alignment angle of the vehicle is determinable from the first angle and the relative alignment angle. A calibration method using the present invention is also disclosed.

Abstract: A measuring gauge intended for use in conjunction with an automotive vehicle alignment system is disclosed to measure and record various measurements associated with automotive maintenance such as tire tread depth, tire pressure, and brake rotor thickness. The measuring gauge comprises a spring loaded plunger axially mounted within a cylindrical body or housing. Extending beyond the housing, one end of the plunger is adapted to linearly engage surface being measured. The opposite end, also extending beyond the housing, is adapted for insertion with a sensor port on an alignment system, and includes a series of annular grooves adapted to drive a rotary encoding sensor within the port. During use, the contact end of the plunger is depressed by the surface undergoing measurement, and the insertion end proportionally extended, revealing a number of the annular grooves. An internal lock secures the plunger in the depressed position upon removal of the gauge from the surface undergoing measurement.

Abstract: An improved vehicle alignment system 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 work in pairs, and a novel synchronization scheme is used to ensure that the emitters of one sensor are not radiating at the same time the emitters of the other sensor of that pair are radiating and to determine which emitter of the pair corresponding to a sensor is radiating. Reflections of the emitters 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 whose image position varies in a specific manner as the imaged object moves radially away from the axis of the lens.

Abstract: A system for measuring angular relationships of wheels of a vehicle includes a radiation source mounted with respect to a first wheel for providing a radiation signal, an image detector having an active array of pixels mounted with respect to a second wheel for receiving an image from the radiation source and for producing an output in response to the radiation signal, and a radiation detector disposed in the path of the radiation from the radiation source for detecting the presence of the radiation signal. A controller is responsive to the presence of the radiation signal to activate the image detector to receive the image from the radiation source and determine an alignment angle of a wheel of the vehicle from the output of the image detector. A mask is mounted between the radiation source and the detector for defining an image of the radiation source upon the detector, the mask preferably having at least three slits therein.

Abstract: A system for measuring angular relationships of wheels of a vehicle includes a radiation source mounted with respect to a first wheel for providing a radiation signal, an image detector having an active array of pixels mounted with respect to a second wheel for receiving an image from the radiation source and for producing an output in response to the radiation signal, and a radiation detector disposed in the path of the radiation from the radiation source for detecting the presence of the radiation signal. A controller is responsive to the presence of the radiation signal to activate the image detector to receive the image from the radiation source and determine an alignment angle of a wheel of the vehicle from the output of the image detector.

Abstract: A vehicle wheel alignment system includes a battery powered wheel alignment sensor assembly and a a storage station for the sensor assembly. The storage station is designed to hold the sensor assembly by the wheel adapter in a predetermined position with respect to the storage station. It also includes a power source for charging the sensor assembly battery. An interlock arrangement automatically interconnects the sensor assembly battery and the power source to charge the sensor assembly battery when the sensor assembly is disposed in the predetermined position. A display is operatively connected to the wheel alignment sensor assembly for displaying measured alignment information. A battery level measuring circuit measures the state of discharge of the sensor assembly battery by examining the battery voltage and generates a signal proportional to the measured battery voltage.

Abstract: Apparatus for determining ride height includes an adapter removably mountable on a wheel of a vehicle while the wheel is mounted on the vehicle, an arm movably mounted with respect to the adapter for movement from a rest position to extended, measuring positions, and distance determining circuitry. The arm has a first end for contacting the vehicle when the arm is extended, contact between the arm and the vehicle halting movement of the arm. The distance traveled by the arm from its rest position to contact with the vehicle is a function of the ride height of the vehicle. The circuitry determines the distance of travel of the arm from its rest position to contact with the vehicle and determines ride height from the distance of travel. The method of determining ride height includes mounting a sensor housing on a wheel of a vehicle while the wheel is mounted on the vehicle, which sensor housing contains at least one sensor for obtaining wheel alignment measurements and defines a path therein.

Abstract: A vehicle wheel alignment and checking apparatus for front and rear wheels in which the apparatus has active light beam projecting instruments mounted on the front wheels to project beams longitudinally and transversely between the wheels of the vehicle, passive wheel position instruments on the wheels for reflecting incident beams to the active instruments, a system of mirrors associated with the active and passive instruments and beam targets for utilizing the system of mirrors and targets to find the alignment information, and alignment data indicators responsive to the manipulation of the active instruments and responses from the passive instruments for visually revealing the alignment data and aiding in adjusting the wheels to specified alignment values.