Experimental Study on an Electric Variable Valve Timing Actuator: Linear Parameter Varying Modeling and Control

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Ali Khudhair Al-Jiboory ◽  
Guoming G. Zhu ◽  
Shupeng Zhang
Keyword(s):  
System Identification ◽  
Engine Speed ◽  
Gain Scheduling ◽  
Variable Valve Timing ◽  
Linear Parameter ◽  
Valve Timing ◽  
Battery Voltage ◽  
Linear Parameter Varying ◽  
Variable Valve ◽  
And Control

This paper presents experimental investigation results of an electric variable valve timing (EVVT) actuator using linear parameter varying (LPV) system identification and control. For the LPV system identification, a number of local system identification tests were carried out to obtain a family of linear time-invariant (LTI) models at fixed engine speed and battery voltage. Using engine speed and battery voltage as time-varying scheduling parameters, the family of local LTI models is translated into a single LPV model. Then, a robust gain-scheduling (RGS) dynamic output-feedback (DOF) controller with guaranteed H∞ performance was synthesized and validated experimentally. In contrast to the vast majority of gain-scheduling literature, scheduling parameters are assumed to be polluted by measurement noises and the engine speed and battery voltage are modeled as noisy scheduling parameters. Experimental and simulation results show the effectiveness of the developed approach.

Integrated System Identification and Control Design for an IC Engine Variable Valve Timing System

2010 ◽  
Author(s):  
Zhen Ren ◽  
Guoming G. Zhu
Keyword(s):  
System Identification ◽  
Closed Loop ◽  
Test Bench ◽  
Open Loop ◽  
Integrated System ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Closed Loop System ◽  
Variable Valve ◽  
And Control

This paper applies integrated system modeling and control design process to a continuously variable valve timing (VVT) actuator system that has different control input and cam position feedback sample rates. Due to high cam shaft torque disturbance and high actuator open-loop gain, it is fairly difficult to maintain the cam phase at the desired constant level with an open-loop controller. As a result, multirate closed-loop system identification is a necessity. For this study, multirate closed-loop system identification, PRBS q-Markov Cover, was used for obtaining linearized system models at different engine operational conditions; and the output covariance constraint (OCC) controller, an H2 controller, was designed based upon the identified model and evaluated on the VVT test bench. Performances of the designed OCC controller was compared with those of the baseline PI controller on the test bench. Results show that the OCC controller uses less control effort and has less overshoot than those of PI ones.

Integrated System ID and Control Design for an IC Engine Variable Valve Timing System

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Zhen Ren ◽  
Guoming G. Zhu
Keyword(s):  
System Identification ◽  
Closed Loop ◽  
Test Bench ◽  
Open Loop ◽  
Integrated System ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Closed Loop System ◽  
Variable Valve ◽  
And Control

This paper applies integrated system modeling and control design process to a continuously variable valve timing (VVT) actuator system that has different control input and cam position feedback sample rates. Due to high cam shaft torque disturbance and high actuator open-loop gain, it is also difficult to maintain the cam phase at the desired constant level with an open-loop controller for system identification. As a result, multirate closed-loop system identification becomes necessary. For this study, a multirate closed-loop system identification method, pseudo-random binary signal q-Markov Cover, was used for obtaining linearized system models of the nonlinear physical system at different engine operational conditions; and output covariance constraint (OCC) controller, an H2 controller, was designed based upon the identified nominal model and evaluated on the VVT test bench. Performance of the designed OCC controller was compared with that of the well-tuned baseline proportional-integral (PI) controller on the test bench. Results show that the OCC controller uses less control effort and has significant lower overshoot than those of PI ones.

A Cam-Based Electro-Hydraulic Variable Valve Timing System for Pneumatic Hybrid Engines

2009 ◽  
Author(s):  
Mohammad Pournazeri ◽  
Amir Fazeli ◽  
Amir Khajepour
Keyword(s):  
Valve Train ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
System A ◽  
Timing System ◽  
Valve Opening ◽  
And Performance ◽  
High Flexibility ◽  
Variable Valve ◽  
And Control

In this work, a new type of cam-based variable valve timing system has been proposed based on the “lost motion” principle. Using this mechanism, the problems with the valve transition time and control complexity which are still serious concerns for camless valve train systems are solved. This mechanism not only allows the engine to work at different modes of operation as an air hybrid engine but also enables it for continuous torque management. In this system, the control methodology utilizes a cam position feedback to control the valve opening timing. A combination of hydraulic and mechanical systems was utilized to offer high flexibility and robustness in the engine valve control system. A zero dimensional analysis is also conducted to evaluate the functionality and performance of the proposed system.

Analysis of Optimum Valve Timing Based on Diesel Engine Comprehensive Performance

2011 ◽  
Vol 347-353 ◽  
pp. 4118-4124
Author(s):  
Ming Ming Wang ◽  
Ren Xian Li
Keyword(s):  
Fuel Economy ◽  
High Speed ◽  
Engine Speed ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Power Performance ◽  
Emission Performance ◽  
Performance And Emission ◽  
Comprehensive Performance ◽  
Variable Valve

In order to investigate the effect of variable valve timing on engine power performance, fuel economy performance and emission performance quantitatively, proceed to optimize it, a high speed diese Specific Fuel Consumption, quantity of NOx and Soot, mass of fresh charge were calculated by 3-D CFD method l engine contains variable valve timing system (VVT) was researched. The effective power, at 6 speeds conditions which valve timing parameters were modulated. A method of calculating CRG was suggested. The results indicate that exhaust advance angle has a little impact on sweep and emission performance, but a big impact on ventilation losses. The optimum exhaust advance angle should be increased as engine speed rises. Increasing intake lag angle in low engine speed could increase coefficient of charge, thereby increase power performance and fuel economy performance. Comprehensive performance could be increased by decreasing intake delay angle under high speed.

Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing

2006 ◽  
Author(s):  
Yutaka Murata ◽  
Jin Kusaka ◽  
Matsuo Odaka ◽  
Yasuhiro Daisho ◽  
Daisuke Kawano ◽  
...  
Keyword(s):  
Engine Speed ◽  
Variable Valve Timing ◽  
Diesel Combustion ◽  
Valve Timing ◽  
Variable Valve

Simulation and Analysis of Variable Valve System Based on Diesel Engine

2014 ◽  
Vol 556-562 ◽  
pp. 1271-1277 ◽  
Author(s):  
Long Yin ◽  
Dong Jian Zeng ◽  
Yi Zeng Peng
Keyword(s):  
Diesel Engine ◽  
Simulation Model ◽  
Engine Speed ◽  
Drive System ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Experiment Data ◽  
Valve System ◽  
Valve Drive ◽  
Variable Valve

The necessity and superiority of using variable valve system on diesel is described detailed. The design of electro-hydraulic variable valve drive system is introduced based on DK4A diesel engine, then the mathematical simulation model of the electro-hydraulic variable valve drive system is undertook by Simulink in order to study the movement of the intake valve. The results show the design of variable valve system can achieve the variable valve timing continuous vary in different engine speed and respond quickly. Further, the simulation model of the diesel engine is built by GT-POWER, and then the accuracy of the model is verified according to the experiment data. Lastly the intake performance of the variable valve system in different out flowing phase is analyzed through the GT-POWER model. The results show that when the engine speed at 2000RPM, 2800RPM, 3600RPM, out flowing phase behind 60oCA, 45oCA, 35oCA after intake TDC respectively ,the amount of intake air decreases with the increase of the out flowing phase, the amount of intake air has been effectively controlled by variable valve system.

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