Patent ID: 11873808
Assignee: RENAULT S.A.S.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A method for controlling the start-up of a gearbox oil pump by a brushless electric motor, without position sensor, comprising:
powering stator coils of the motor from an off mode according to a constant-current open-loop control sequence until the pump reaches a speed threshold at which a speed regulation switches over to closed-loop control on a setpoint corresponding to a lubrication flow rate necessary to ensure reliability of a gearbox, but without exceeding a current threshold detecting seizure of the pump at which motor control switches back over to a constant-current open-loop control sequence,
wherein the open-loop current setpoint is higher than the threshold for switching over to closed-loop mode, so as to have, in open-loop mode, a motor torque on the pump that is higher than in the closed-loop mode, and
wherein, upon detection of seizure of the pump in the closed-loop mode, a GMP computer switches over the pump speed regulation to the open-loop mode for a calibrated period.