Vehicle rollover sensing system using driving information for optimization

A vehicle rollover sensing system using driving information for optimization comprising a processor configured to:

• determine a longitudinal velocity of a vehicle using a wheel speed, a steering angle, and GPS vehicle velocity information;
• determine a lateral velocity of the vehicle using the longitudinal velocity, a yaw rate, the steering angle, a lateral acceleration, and GPS vehicle heading direction information;
• determine a rollover type of the vehicle using the longitudinal velocity and the lateral velocity of the vehicle;
• and
• determine whether or not to deploy a vehicle restraint device according to the determined rollover type,
• wherein the wheel speed is measured by a wheel speed sensor which includes:
• a first wheel speed sensor measuring a speed of a left front wheel of the vehicle;
• a second wheel speed sensor measuring a speed of a right front wheel of the vehicle;
• a third wheel speed sensor measuring a speed of a left rear wheel of the vehicle;
• and
• a fourth wheel speed sensor measuring a speed of a right rear wheel of the vehicle, wherein the processor is further configured to:
• determine whether the steering angle exceeds a critical value and compare each wheel speed with a first average value so that the longitudinal velocity is determined as a first longitudinal velocity when a difference between each wheel speed and the first average value is within a first tolerance range;
• compare each wheel speed with a second average value when the difference between each wheel speed and the first average value exceeds the first tolerance range so that the longitudinal velocity is determined as a second longitudinal velocity when the difference between each wheel speed and the second average value is within a second tolerance range;
• and
• compare the GPS vehicle velocity information with a third average value when the difference between each wheel speed and the second average value exceeds the second tolerance range so that the longitudinal velocity is determined as a third longitudinal velocity when a difference between the GPS vehicle velocity information and the third average value is within a third tolerance range and so that the longitudinal velocity is determined as a fourth longitudinal velocity when the difference between the GPS vehicle velocity information and the third average value exceeds the third tolerance range,
• wherein the first average value is an average value of the wheel speeds measured by the first wheel speed sensor to the fourth wheel speed sensor, the second average value is an average value of the wheel speeds measured by the first wheel speed sensor to the fourth wheel speed sensor, excluding the measured value of the wheel speed sensor that has a largest difference from the first average value, and the third average value is an average value of the measured values of the wheel speed sensors, which are used to calculate the second average value, excluding the measured value of the wheel speed sensor that has a largest difference from the second average value.