Method for regulating the control of an electrical wastegate actuator by measuring the current passing through the electrical actuator

Abstract

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; and repeating the method until the set position is reached.

Description

technical field [0001] The invention relates to a method for controlling the control of an electric actuator of a valve allowing the diversion of the exhaust gas of an internal combustion engine from the fluid supply circuit of the turbine of a turbocharger designed to compress Air from the engine enters the new gas circuit. Background technique [0002] The valve or obturator used to divert exhaust gas from the turbocharger turbine is also commonly referred to by those skilled in the art as a "wastegate", and the two terms are used equivalently throughout the remainder of this document. When an electric motor type electric actuator controls such a valve, there is an H-bridge in the circuit for controlling the rotation of the electric motor to allow said electric motor to rotate in both the forward direction or the reverse direction , to open or close the valve. [0003] "Valve" is here understood to be any movable closure installed in an exhaust pipe or passage and which ...

AI Technical Summary

Problems solved by technology

[0008] A disadvantage of the above disclosed system for monitoring the position of the wastegate is that it requires the use of three connection pins on the ECU, and the current trend is to minimize the number of such connections

Furthermore, position sensors imply considerable costs and potential sources of failure notably due to worn or defective electrical contacts

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