METHOD AND SYSTEM FOR CONTROLLING A CLUTCHLESS AUTOMATIC TRANSMISSION FOR A HYBRID-PROPULSION MOTOR VEHICLE

Disclosed is a method for controlling at least one gearbox actuator for a transmission for a hybrid-propulsion motor vehicle comprising a heat engine and at least one electric machine, said transmission comprising at least one dog clutch system comprising dogs secured to a freely rotatable idler gear on a drive shaft and dogs secured to a sliding gear rotatably secured to a primary shaft, the sliding gear being configured to be moved longitudinally along the axis of the drive shaft by the gearbox actuator in order to engage or disengage the dogs. With a view to disengaging the dogs, the method involves calculating an engine torque setpoint (Cm_ cons) to cancel the torque at the dog (Cc) by applying the fundamental principle of dynamics to the dogs (6) to be disengaged; transmitting said calculated engine torque setpoint (Cm_cons) to the engine until the torque at the dog reaches a threshold value (CS1), following a first linearly decreasing slope; comparing the torque at the dog (Cc) with the threshold value (CS1); and, when the torque at the dog (Cc) is less than or equal to the threshold value (CS1), controlling the gearbox actuator (8) by sending a position setpoint (P_cons) to trigger the movement of the sliding gear (7) in order to disengage the dogs (6).