Patent ID: 8463517

Claim:
A hill start assistance method for a motor vehicle including a clutch and a transmission between the clutch and drive wheels of the vehicle, the method comprising: holding the motor vehicle immobile on a hill; determining via computation means of the vehicle a clutch torque (C emb ) to keep the vehicle immobile based on knowledge of an engine torque (C me ); estimating an equivalent torque C me,off as a quota of the engine torque dedicated to an operation of accessories of the vehicle, determining the clutch torque (C emb ) by a system formed by Equation (2) and Equation (3): ω . m . p = 1 J ⁢ ( - C emb + C me - C me , off ) + K 1 ⁡ ( ω . m , p - ω . m ) Equation ⁢ ⁢ ( 2 ) C . emb = K 2 ⁡ ( ω . m , p - ω . m ) ; ⁢ and Equation ⁢ ⁢ ( 3 ) mobilizing the motor vehicle on the hill after a period of immobility, wherein K1 and K2 are constants; Equation (2) corresponds to a modified sum of the moments exerted on the transmission between the clutch and the drive wheels of the vehicle, for which a disturbance K 1 ({dot over (ω)} m,p −{dot over (ω)} m ) associated with the engine speed is added, and Equation (3) establishes a link between the derivative of the clutch torque (C emb ) and the disturbance associated with the engine speed.