Turbocharging control method and system, and engine

Abstract

The invention discloses a turbocharging control method and system, and an engine. The control method comprises the steps that the rotating speed of the engine and the position signal of an acceleratorpedal are read, and the change rate of the position signal of the accelerator pedal is calculated according to the position signal of the accelerator pedal; if the change rate of the position signalof the accelerator pedal is greater than a signal threshold value or the change rate of the rotating speed of the engine is greater than a rotating speed threshold value, a turbocharger goes into theinstantaneous condition; the turbocharger goes into the steady-state condition if the change rate of the position signal of the accelerator pedal is less than the signal threshold value or the changerate of the rotating speed of the engine is less than the rotating speed threshold value; if the turbocharger is under the steady-state condition, an engine management unit reads a demand signal and calculates the supercharge pressure; under the condition of determining the supercharge pressure ratio, the working point of the turbocharger is changed thorough an electronic actuator; if the turbocharger is under the instantaneous condition, the engine management unit reads the demand signal and calculates the supercharge pressure; under the condition of determining the supercharge pressure ratio, closed-loop control is conducted through the electronic actuator to improve the turbocharging efficiency. Through the turbocharging control method, the control precision and the response efficiencycan be improved.

Description

Technical field [0001] The present invention relates to the technical field of turbines, in particular to a turbocharger control method and control system, and an engine. Background technique [0002] In the prior art, the turbocharger control system mainly includes a mainstream bypass valve turbocharger control system and a variable geometry turbocharger control system. The main difference between the two is that the bypass waste valve is replaced by a variable nozzle nozzle ring. . [0003] But both of them adjust the gas pressure of the pneumatic actuator through the boost pressure limit valve and the engine management unit, so that the pneumatic actuator drives the wastegate valve or the variable nozzle ring to change the position, and controls the flow and angle of the exhaust gas entering the turbine. The final control boost pressure is the target boost pressure; [0004] The entire process of driving the turbocharger is lengthy, which makes the control system response slow a...

AI Technical Summary

Problems solved by technology

[0004] The entire process of driving the turbocharger is lengthy, which makes the response of the control system slow and cannot effectively control the hysteresis effect of the turbocharger

Moreover, the control accuracy of pneumatic actuators is poor

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