Patent ID: 8489311

Claim:
A method for failsafe control of a micro-hybrid alternator-starter system for a micro-hybrid vehicle; the vehicle comprising an on-board battery ( 10 ) supplying a first on-board network at the voltage Vbat, at least one electronic control unit ( 15 ), vehicle sensors, a data communication bus ( 16 ) and an on-board electrical network; the micro-hybrid system comprising at least one rotary electrical machine ( 2 ) provided with a means ( 8 ) for detection of rotation, power circuits ( 114 ) comprising at least one inverter ( 7 ) and an excitation circuit ( 4 ) supplying the rotary electrical machine ( 2 ) and a rectifier ( 11 ) supplied by the rotary electrical machine ( 2 ), energy conversion circuits connected to an energy storage means ( 9 ) supplied by the rectifier ( 11 ), a first circuit ( 113 ) to control the power circuits ( 114 ) and a second circuit ( 25 ) to control the energy conversion circuits; the method comprising the steps of: generating signals (Dd. Exc., Dd. Ond., Auth. Exc., Auth. Ond.) to control the micro-hybrid system on the basis of first information signals (Capt. Véh.) representative of a state of functioning of the vehicle, obtained from the vehicle sensors; and generating by means of the first control circuit ( 113 ) signals (Cd. Exc., Cd. Ond.) to control the power circuits ( 114 ) on the basis of diagnostic signals (Diag 2 . Exc., Diag 2 . Ond.) representative of a state of functioning of the power circuits ( 114 ); the control signals (Dd. Exc., Dd. Ond., Auth. Exc., Auth. Ond.) being additionally generated by means of the second control circuit ( 25 ) under the control of the electronic control unit ( 15 ).