CLOSED LOOP TURBOCHARGER CONTROL SYSTEM WITH TRANSIENT WASTEGATE CONTROL

摘要

A closed loop turbocharger control system with transient wastegate control utilizes a microprocessor for controlling a turbocharged internal combustion engine. The system utilizes transient wastegate control and spark knock control to provide optimum control of the turbocharger (10) during all engine load operations. A table of boost setpoints and spark advance and retard timings are stored in memory and are addressed as a function of the position of the throttle valve (36) and the speed (70) of the engine. The boost setpoints are used to control the operation of a wastegate control valve (52) and the spark timing control is used to adjust ignition timing to normalize the maximum advance angle at which spark and pressure knock occurs.