Abstract
An exhaust gas recirculation (EGR) valve position control system requires fast response without overshoot, but the low control frequency limits control bandwidth and results in poor position response. A novel EGR valve position control scheme is proposed to improve the position response at low control frequency. This is based on the feedforward controller, but the feedforward control loop is implemented without the position pattern generator or derivative. The proposed method estimates the acceleration command through the relationship between the position controller output, the speed command and the speed limiter, and compensates the cascaded proportional-proportional integral (P-PI) controller. In this method, many operations are not required and noise due to derivative is not generated. This method can improve the position response without much computation and derivative noise at the low control frequency. Experimental results are presented to verify the feasibility of the proposed position control algorithm.
Highlights
Environmental pollution by vehicle exhaust gas is an important issue in the world
To meet the nitrogen oxides (NOx) emission standard and minimize the lowering of the fuel economy, the recirculated exhaust gas should be properly controlled through the exhaust gas recirculation (EGR) valve
The velocity pattern created through the integral of the acceleration command is used as the speed command, and the acceleration command is compensated to the speed controller
Summary
Environmental pollution by vehicle exhaust gas is an important issue in the world. In particular, nitrogen oxides (NOx) are strictly regulated by the EURO 6 standard for exhaust gas regulation [1,2]. The amount of the recirculated exhaust gas is determined by the position of the EGR valve [5]. To meet the NOx emission standard and minimize the lowering of the fuel economy, the recirculated exhaust gas should be properly controlled through the EGR valve. The control bandwidth is limited by the low control frequency, and the EGR valve position control system cannot respond quickly without the position overshoot. A feedforward control scheme using a time-based position pattern generator was proposed [12]. The control bandwidth of the position controller, which is limited by the speed controller, can increase and improve the position response. To verify the feasibility of the proposed position control scheme, experimental results for the EGR valve position control system under various operating conditions are presented
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