METHOD FOR REGULATING THE CONTROL OF AN ELECTRICAL WASTEGATE ACTUATOR BY MEASURING THE CURRENT PASSING THROUGH THE ELECTRICAL ACTUATOR

摘要

Method for regulating the control of an electrical wastegate actuator controlled via an H bridge to permit displacement of the wastegate in its closure and opening directions according to whether the current passes through the actuator in one or opposite direction, includes:
determining a set position which the wastegate has to reach, and an activation time of the actuator defining a monitoring time;applying a control signal to the actuator to displace the valve into the set position;measuring the current passing through the H bridge and applying a correction factor to the current to obtain the motor torque;obtaining the displacement speed of the wastegate by integration of the motor torque;obtaining the position reached by the wastegate at the end of the monitoring time by integration of the speed;comparing the position reached with the set position; andrepeating the method until the set position is reached.

主权项

1. A method for regulating the control of an electrical actuator of a valve permitting the exhaust gases of an internal combustion engine to be diverted from the fluid supply circuit of a turbine of a turbocharger designed to compress the fresh gases admitted into the air intake circuit of said internal combustion engine, said electrical actuator being controlled by means of an H bridge in order to permit a displacement of the valve in the direction of its closure and in the direction of its opening according to whether the current passes through the electrical actuator in one direction or in the opposing direction, characterized in that the method comprises the following steps:
step 1: determining a set position (Pc) which said valve has to reach from a known position (Pref) thereof and an activation time of said electrical actuator of the valve defining a monitoring time (tp), step 2: applying a control signal to the electrical actuator of said valve via said H bridge during said monitoring time (tp) to displace the valve into said set position, step 3: measuring the electrical current which passes through the H bridge during the monitoring time (tp) and applying a correction factor (Km) to said measured electrical current so as to obtain the motor torque (Cm) delivered by the electrical actuator during said monitoring time (tp), step 4: obtaining the speed of displacement of the valve during said monitoring time (tp) by the integration of said motor torque (Cm) over said monitoring time (tp), step 5: obtaining the position reached (Ptp) by the valve at the end of the monitoring time (tp) by the integration of the speed over said monitoring time (tp), step 6: comparing said position which has been reached (Ptp) with said set position (Pc), step 7: repeating the method from step 2 until said set position (Pc) is reached.