Crosstalk compensation in wheel alignment system
AssigneeSPX Corporation
InventorsGary R. Kercheck, Peter A. Peutz
Life of this patent
Estimating the term…
Abstract
A wheel alignment system measures true camber and true pitch. Camber and pitch angles are measured using a head unit coupled to the wheel of the automotive vehicle. True camber and true pitch are calculated based upon measured camber and measured pitch, a camber crosstalk value, and a pitch crosstalk value.
Claims15
A method of aligning wheels of a vehicle, the vehicle having two front steerable wheels and two back wheels, the method comprising:
- mounting head units to the two front steerable wheels and the two back wheels of the vehicle;
- obtaining read.sub.-- camber measurements from each of the head units mounted to the two front steerable wheels of the vehicle;
- obtaining read.sub.-- pitch measurements from each head unit mounted to the two front steerable wheels of the vehicle;
- retrieving camber.sub.-- crosstalk values for each of the head units mounted to the two front steerable wheels of the vehicle;
- retrieving pitch.sub.-- crosstalk values for each of the head units mounted to the two front steerable wheels of the vehicle;
- calculating true.sub.-- camber for each of the head units mounted to the two front steerable wheels of the vehicle based upon read.sub.-- camber, read.sub.-- pitch, and camber.sub.-- crosstalk for each of the head units mounted to the two front steerable wheels of the vehicle;
- calculating true.sub.-- pitch for each of the head units mounted to the two front steerable wheels of the vehicle based upon read.sub.-- camber, read.sub.-- pitch, and pitch.sub.-- crosstalk for each of the head units mounted to the two front steerable wheels of the vehicle;
- and
- aligning the wheels of the vehicle using true.sub.-- camber and true.sub.-- pitch of the front two steerable wheels of the vehicle.
A method for accurately measuring true.sub.-- camber and true.sub.-- pitch of a wheel of an automotive vehicle, the method comprising:
- mounting a head unit on a wheel of the automotive vehicle;
- obtaining a read.sub.-- camber measurement for the wheel of the automotive vehicle from a camber sensor in the head unit;
- obtaining a read.sub.-- pitch measurement for the head unit of the automotive vehicle from a pitch sensor in the head unit;
- retrieving a camber.sub.-- crosstalk value for the head unit;
- retrieving a pitch.sub.-- crosstalk value for the head unit;
- calculating true.sub.-- camber of the wheel of the automotive vehicle based upon read.sub.-- camber, read.sub.-- pitch and the camber.sub.-- crosstalk value;
- and
- calculating true.sub.-- pitch of the head unit of the automotive vehicle based upon read.sub.-- pitch, read.sub.-- camber, and the pitch.sub.-- crosstalk value.
An apparatus for aligning a wheel of an automotive vehicle, comprising:
- a head unit coupled to the wheel of the automotive vehicle;
- means for measuring camber angle of the wheel and providing a read.sub.-- camber output;
- means for measuring pitch angle of the head unit and providing a read.sub.-- pitch output;
- means for retrieving camber.sub.-- crosstalk for the head unit;
- means for retrieving pitch.sub.-- crosstalk for the head unit;
- means for calculating true.sub.-- camber of the wheel of the automotive vehicle based upon read.sub.-- camber, read.sub.-- pitch, and camber.sub.-- crosstalk;
- means for calculating true.sub.-- pitch of the head unit based upon read.sub.-- camber, read.sub.-- pitch, and pitch.sub.-- crosstalk;
- and
- means for providing outputs based upon true.sub.-- camber and true.sub.-- pitch.
An apparatus for measuring true.sub.-- camber in an automotive vehicle wheel alignment system, comprising:
- a head unit coupled to a wheel of the automotive vehicle;
- means for measuring camber angle of the wheel and providing a read.sub.-- camber output;
- means for measuring pitch angle of the head unit and providing a read.sub.-- pitch output;
- means for calculating true.sub.-- camber of the wheel of the automotive vehicle based upon read.sub.-- camber, read.sub.-- pitch and a camber.sub.-- crosstalk value;
- and
- means for providing an output based upon true.sub.-- camber.
An apparatus for measuring true.sub.-- pitch of a head unit coupled to a wheel of an automotive vehicle in an automotive vehicle wheel alignment system, comprising:
- a head unit coupled to the wheel of the automotive vehicle;
- means for measuring camber angle of the wheel and providing a read.sub.-- camber output;
- means for measuring pitch angle of the head unit and providing a read.sub.-- pitch output;
- means for calculating true.sub.-- pitch of the wheel of the automotive vehicle based upon read.sub.-- pitch, read.sub.-- camber and a pitch.sub.-- crosstalk value;
- and
- means for providing an output based upon true.sub.-- pitch.
Dependencies are inferred from the claim text.