FIELD: electromechanics/electronics.
SUBSTANCE: automatic testing of control valves for diagnosis of actuators, including actuators not equipped with analog or discrete position converters, is proposed. The valve controller confirms stationary conditions for the turbocharger system, including that the control valve is in the first position, and sends a signal to the control valve actuator to initiate partial valve travel to move the control valve from the first position. The valve controller receives feedback signals from sensors in the turbocharger system and monitors the feedback signals for changes from stationary conditions. Tracking includes: identifying a set number of different time intervals for the application; tracking the differential for the feedback signals at each of said different time intervals; and comparing the derivatives calculated by using each of the different time intervals with a stationary threshold. If monitoring detects a change in steady state conditions over a predetermined period of time, the valve controller signals the actuator to return the control valve to the first position. If monitoring does not detect a change from stationary conditions for a predetermined period of time, the valve controller generates a fault.
EFFECT: increased efficiency by the way of control valve automatic testing and better actuator functioning.
20 cl, 9 dwg
