Active disturbance observation-based fuel pressure controller and control method thereof

Abstract

The invention relates to an active disturbance observation-based fuel pressure control method, aims at solving the problems of time-varying characteristics and non-linearity of an internal combustion engine fuel injection system and non-ideal application of traditional PID (proportion integration differentiation) control in fuel pressure control and the like, and provides the method of realizing control on fuel pressure by adopting model-based feedforward control and state observation-based feedback control. The method mainly comprises target fuel pressure computation, fuel pressure sensor practical fuel pressure collection and computation, fuel measuring unit fuel volume flow rate feedback regulation amount computation, fuel measuring unit fuel volume flow rate feedforward control amount computation, conversion of fuel measuring unit fuel volume flow rate into current, conversion of fuel measuring unit current into a PWM (Pulse Width Modulation) duty ratio, fuel measuring unit practical work current measurement and computation, a fuel measuring unit current feedback regulator, fuel measuring unit PWM modulation frequency computation, a fuel measuring unit PWM drive, a fuel measuring unit, a fuel injection system and a fuel pressure active disturbance observer.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine control, relates to an internal combustion engine fuel injection system, and relates to a fuel pressure control method for the internal combustion engine fuel injection system, in particular to a fuel pressure control method based on active disturbance observation. Background technique [0002] The internal combustion engine is the model with the highest thermal efficiency, the best energy utilization rate, and the most energy-saving model among the various power machinery currently being industrialized. It has been widely used in power generation, irrigation, ship power, vehicle power, etc. The advantage in power is the most obvious, and the global trend of "internal combustion engine" in vehicle power has been formed. [0003] According to the different ignition methods, internal combustion engines can be divided into spark ignition engines (such as gasoline engines, that is, ...

AI Technical Summary

Problems solved by technology

(2) During the transient process, the fuel pressure changes sharply and frequently

Due to the complexity, time-varying and non-linear problems of the internal combustion engine fuel injection system, with the change of engine speed, load and other operating conditions, its internal parameters have changed greatly, which makes the PID control performance insufficient to compensate Changes in fuel injection system parameters lead to performance degradation and even system instability

[0014] Since the PID control always adjusts after the error has occurred, if the disturbance has occurred but no deviation occurs, the PID controller will not work and adjust, so the adjustment process of the PID controller always lags behind the disturbance, and there is a lag

Images