Variable nozzle turbocharging control method and system

The invention provides a control method and a system for nozzle changeable turbocharger, which relates to an electric control system of a nozzle changeable turbocharger with an electrohydraulic servo ratio electromagnetic valve as an executor. The invention is characterized in that based on the acqu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WANG ENHUA, YE ZIQING, XIA SHENGZHI
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention provides a control method and a system for nozzle changeable turbocharger, which relates to an electric control system of a nozzle changeable turbocharger with an electrohydraulic servo ratio electromagnetic valve as an executor. The invention is characterized in that based on the acquired rotate speed of an engine and the acquired position signal of an accelerator pedal, a target boost pressure value and a target position driving signal value are worked out; and a control algorithm of the PWM signal value used to drive the electrohydraulic servo valve adopts an open loop feedforward control with the optimum position of the electromagnetic valve as the a control target, and a closed loop digital PI feedback control with a boost pressure in an air inlet pipe as a control target. In order to improve the control precision and the response speed of the control system, the control parameters of the closed loop PI control is obtained by checking up a two-dimensional MAP graph according to the rotate s