Vehicle stability control system and method

A method for performing hill hold control for a vehicle, the method comprising:

• receiving signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, and a pitch rate;
• calculating a sideslip angle based on at least the lateral acceleration;
• calculating a vehicle pitch angle from the lateral acceleration, the longitudinal acceleration, the yaw rate, the roll rate, and the pitch rate;
• calculating a longitudinal velocity gradient from the longitudinal acceleration, yaw rate, the sideslip angle, and a global pitch angle;
• calculating a road grade from the vehicle pitch angle and the global pitch angle;
• detecting back sliding using the road grade, a vehicle speed or wheel speeds, a vehicle side slip angle, and the longitudinal velocity gradient;
• and
• applying braking when back sliding is detected.

A method for performing hill hold control for a vehicle, the method comprising:

• receiving signals corresponding to a lateral acceleration, a longitudinal acceleration, a yaw rate, a roll rate, a pitch rate, and wheel speed;
• calculating a sideslip angle based on at least the lateral acceleration;
• calculating a vehicle pitch angle from the lateral acceleration, the longitudinal acceleration, the yaw rate, the roll rate, and the pitch rate;
• calculating a road grade from the vehicle pitch angle and a global pitch angle, when an inclined or decline road grade is calculated;
• calculating a longitudinal velocity gradient from the longitudinal acceleration, yaw rate, the sideslip angle, and the global pitch angle;
• detecting back sliding using the road grade, a vehicle speed or wheel speeds, the sideslip angle, and the longitudinal velocity gradient;
• detecting undesired acceleration of the vehicle using wheel speed;
• and
• applying braking when one or more of back sliding and undesired acceleration is detected, and maintain braking until a driver of the vehicle applies a sufficient level of braking or throttle.