Motec Interpreter Manuel d'utilisateur télécharger pdf (Page 13)

MoTeC Acquiring Data 11

necessary for the sensor to provide accurate data for display and analysis in

MoTeC interpreter:

G-Force Sensor

A G force sensor measures the vehicle acceleration in up to three directions.

The three axes are:

 Lateral G: the left/right forces felt when driving around a corner. This

sensor is conventionally calibrated to read positive for a left turn (right

force so G sensor arrow points right)

 Longitudinal G: the forces felt during acceleration and braking. This

sensor is calibrated to read positive for acceleration (backwards force

so G sensor arrow points backwards)

 Vertical G: the forces felt due to gravity. This sensor is calibrated to

read positive up (downwards force so G sensor arrow points down)

The G sensor should be mounted as close as possible to the center of gravity

of the vehicle, and carefully aligned within 2° of the vehicle axis. Angles

greater than 2° reduce the accuracy of the sensor. A G sensor can be

easily tested by turning the sensor so that the arrow points down. The sensor

should read 1G: the force of gravity.

Steered Angle

The Steered angle sensor measures the angle of the road wheel where 0° is

straight ahead and positive degrees is a right turn. The sensor is typically

mounted to the steering column but calibrated in degrees of road wheel

steering, not steering wheel angle. The sensor should be calibrated using the

outside wheel, i.e. the right wheel for left turn and vice versa, especially if the

vehicle has Ackerman steering.

The steered angle sensor can be calibrated as follows:

1. Place the front suspension on axle stands so the front wheels are off the

ground but the front suspension is loaded.

2. Using the Sensor Calibration function in the MoTeC Dash Manager

calibrate the sensor according to the table below

A table of the measured distance at the rim for 13” to 18” wheels is included

below. The measurements are millimeters difference between the front and

rear of the rim to a parallel reference line.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 36 37

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Motec Interpreter Manuel d'utilisateur Page 13