ADRC-based transient air/fuel ratio control with time-varying transport delay consideration for gasoline engines

2017 ◽  
Vol 12 ◽  
pp. S117-S124 ◽  
Author(s):  
Zhijing Wang ◽  
Xiaohong Jiao
Keyword(s):  
Time Varying ◽  
Gasoline Engines ◽  
Transport Delay ◽  
Fuel Ratio

A Dual-Loop EGR Engine Air-Path Oxygen Concentration Model With Time-Varying Transport Delays

2013 ◽  
Author(s):  
Xiangrui Zeng ◽  
Junmin Wang
Keyword(s):  
Oxygen Concentration ◽  
Dynamic Models ◽  
Operating Conditions ◽  
High Fidelity ◽  
Exhaust Gas ◽  
Time Varying ◽  
Transport Delay ◽  
Engine Model ◽  
Gas Recirculation ◽  
Transient Operations

Dual-loop exhaust gas recirculation (EGR) systems can provide control authorities for adjusting the engine in-cylinder gas conditions. However, the transport delay in the EGR air-path makes some simple oxygen concentration dynamic models perform poorly under the transient operating conditions. In this paper, a dual-loop EGR air-path oxygen concentration model considering the time-varying transport delays is developed and a method to calculate the delay time based on the continuity of gas velocity is presented. Simulation validations using a high-fidelity GT-Power 1-D computational engine model show that the developed model can capture the oxygen concentration dynamics during both steady-state and transient operations.

Parameter-Varying Loop-Shaping for Delayed Air-Fuel Ratio Control in Lean-Burn SI Engines

2016 ◽  
Author(s):  
Shahin Tasoujian ◽  
Behrouz Ebrahimi ◽  
Karolos Grigoriadis ◽  
Matthew Franchek
Keyword(s):  
Phase System ◽  
Control Input ◽  
Time Varying ◽  
Lean Burn ◽  
Estimation Errors ◽  
Gasoline Engines ◽  
Time Varying Delay ◽  
Loop Shaping ◽  
Parameter Varying ◽  
Varying Delay

Dynamic systems with time-varying delay in the control input are studied in the present paper. The delay is considered as a varying parameter and Padé approximation is applied to transfer the infinite-dimensional delay problem into a finite-dimensional paradigm represented in the form of a non-minimum phase system (NMP). Inherited delay characteristics are now represented through unstable internal dynamics for the NMP system, which poses restrictions on the achievable control bandwidth thereby resulting in an imperfect tracking performance and poor stability condition. Presented in this paper, is a methodical parameter-varying loop-shaping control design approach, which simultaneously satisfy a variety of control requirements and offer an insight into the limitations posed by the NMP representation. The suggested method is then applied to fueling control in lean-burn gasoline engines addressing the varying transport and combustion delay. The developed approach is validated with experimental data on a Ford F-150 truck SI lean-burn engine with large time-varying delay in the control loop and the closed-loop system responses are presented to demonstrate disturbance rejection, measurement noise attenuation, and robustness properties against delay estimation errors.

scholarly journals SIMULASI KENDALI TEKANAN KOMPRESOR PADA ELECTRICALLY ASSISTED TURBOCHARGER DENGAN METODE PI-GAIN SCHEDULING

Transmisi ◽  
2018 ◽  
Vol 20 (2) ◽  
pp. 85
Author(s):  
Miftahuddin Arsyahadij ◽  
Iwan Setiawan ◽  
Yuli Christyono
Keyword(s):  
Gain Scheduling ◽  
Time Varying ◽  
Si Engine ◽  
Fuel Ratio ◽  
Electrically Assisted

Mayoritas dari mobil-mobil berpenumpang didesain sehingga memiliki performa yang handal, hemat bahan bakar, dan rendah emisi gas buang. Dalam hal kemampuan sebuah mobil mampu mengatasi berbagai medan jalan yang ada maka performa yang handal menjadi fokus dari pengembangan mobil-mobil saat ini. Beberapa cara untuk meningkatkan performa dari SI engine adalah variasi pemilihan bahan bakar, mengubah rasio kompresi mesin, mengubah nilai air to fuel ratio (AFR), dan menggunakan turbocharger. Turbocharger merupakan salah satu cara yang terbaik. Turbocharger juga memiliki kelemahan apabila diterapkan di SI engine yaitu terjadinya kondisi turbo lag. Penelitian ini merancang sistem kendali yang pada EAT untuk meminimalkan turbo lag pada turbocharger. Metode sistem kendali yang digunakan ada PI-Adaptif. Kendali PI akan mengendalikan agar sistem memiliki respon yang cepat dan stabil. Kendali adaptif akan mengatasi parameter atau variabel sistem yang berubah berdasarkan waktu (time varying).

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