Position Sensor Operating Principles

The sensor determines current vehicle location by calculating the previously sensed position, the distance traveled from this position, and the directional changes occurring during this travel.

1. Distance traveled

   The distance traveled is calculated using signals received from the vehicle speed sensor. The sensor automatically compensates for the slightly reduced wheel and tire diameter resulting from tire wear.

2. Forward movement (Direction)

   Changes in the direction of forward movement are calculated

   Fig 1: Location Positioning Display

   Courtesy of NISSAN MOTOR CO., U.S.A.

   by the gyro (angular velocity sensor) and the GPS antenna (GPS data). Each of these functions has its advantage and disadvantages. Depending upon conditions, one function takes precedence over the other to accurately determine the direction of forward movement.

   Fig 2: Functions Advantage And Disadvantage Chart

   Courtesy of NISSAN MOTOR CO., U.S.A.