GPS assisted vehicular longitudinal velocity determination
AssigneeGM Global Technology Operations LLC
InventorsJihan Ryu, Cheng-Foo Chen
Life of this patent
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Abstract
A vehicle includes a GPS system and a longitudinal accelerometer. Accelerometer corrections are derived based on GPS velocity data. Individual wheel speeds are determined based on GPS velocity data. Longitudinal vehicle velocity may be determined based on accelerometer data or individual wheel speeds.
Claims14
Method for determining longitudinal acceleration of a vehicle equipped with a longitudinal accelerometer and a global positioning system (GPS), comprising:
- measuring a signal from the longitudinal accelerometer;
- determining a sensitivity and bias of the longitudinal accelerometer using a measure of vehicle longitudinal velocity provided by the GPS, a measure of vehicle lateral velocity, and a measure of vehicle yaw rate;
- and
- determining longitudinal acceleration of the vehicle by applying the sensitivity and bias to the measured signal from the longitudinal accelerometer.
Method of using a vehicle dynamics control system in a vehicle having a longitudinal accelerometer, a global positioning system (GPS) and a plurality of wheels, comprising:
- receiving longitudinal acceleration data from the longitudinal accelerometer;
- receiving GPS velocity data from the GPS;
- and
- using GPS velocity data in determining corrections for the longitudinal acceleration data and in determining vehicle velocity.
The method of 9 wherein calculating longitudinal velocities comprises:
- calculating longitudinal and lateral velocities of the vehicle at a center of gravity of the vehicle using GPS velocity data;
- and
- calculating longitudinal and lateral velocities at a wheel using the calculated longitudinal and lateral velocities of the vehicle at a center of gravity of the vehicle;
Dependencies are inferred from the claim text.