ACCELERATION SENSING OF FAST ROLL AND SLOW ROLL FOR VEHICLE

A method and system for operating restraint devices in a vehicle during a fast roll event or a slow roll event includes a lateral acceleration sensor and an angular rate sensor. When the angular rate and a vertical acceleration of the vehicle predict a vehicle rollover, the system integrates the lateral acceleration from the lateral acceleration sensor to obtain a roll rate velocity. When the lateral acceleration is greater than a fast lateral acceleration threshold and the roll rate velocity is greater than a fast roll rate velocity threshold, the system provides a fast roll event output. When the lateral acceleration is less than the fast lateral acceleration threshold and greater than a slow lateral acceleration threshold while the roll rate velocity is greater than a slow roll rate velocity threshold, the system provides a slow roll event output. The system operates restraint devices based on the roll event.