Patent ID: 8583321

Claim:
A method for failsafe control of an alternator-starter system ( 1 , 27 ) coupled to a thermal engine ( 2 ) of a vehicle; the vehicle comprising at least one electronic control unit ( 17 ), vehicle sensors, a data communication bus ( 19 ) and an on-board electrical network (Vbat, Vbat+X); the alternator-starter system ( 1 , 27 ) comprising at least one rotary electrical machine ( 3 ) provided with means ( 15 ) for detection of rotation, power circuits ( 14 ) comprising at least one inverter ( 12 ) and an excitation circuit ( 10 ) supplying the rotary electrical machine ( 3 ), and a control circuit ( 13 ) for controlling the power circuits ( 14 ); the method comprising the steps of: generating by means of the electronic control unit ( 17 ) control signals (Dd. Exc., Dd. Ond., Auth. Exc., Auth. Ond.) to control the alternator-starter system ( 1 , 27 ) on the basis of first information signals (Capt. Véh.) representative of a state of functioning of the vehicle, obtained from the vehicle sensors; generating by means of the control circuit ( 13 ) control signals (Cd. Exc., Cd. Ond.) to control the power circuits ( 14 ) on the basis of diagnostic signals (Diag 1 . Ond., Diag 2 . Exc., Diag 2 . Ond.) representative of a state of functioning of the alternator-starter system; generating the control signals (Dd. Exc., Dd. Ond., Auth. Exc., Auth. Ond.) by means of the electronic control unit ( 17 ) on the basis of at least one first diagnostic signal (Diag 1 . Ond.) from amongst the diagnostic signals (Diag 1 . Ond., Diag 1 . Exc., Diag 2 Ond., Diag 2 . Exc.); and generating the control signals (Cd. Ond., Cd. Exc.) by means of the control circuit ( 13 ) on the basis of second information signals (CAN) obtained from the data communication bus ( 19 ).