Modeling and simulation of a dual-mode electrohydraulic fully variable valve train for four-stroke engines

Wong, Pak-Kin; Tam, Lap Mou; Li, K.

doi:10.1007/s12239-008-0061-2

Cited by 18 publications

(12 citation statements)

References 15 publications

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“…The control performances of the three controllers are shown in Table I. As the range of air-ratio for combustible mixture is very narrow, logarithmic mean absolute error is chosen as the logarithmic tracking error (LTE) to evaluate the overall robustness of the controllers, and is defined by (14).…”

Section: B Pilot Test 1 -System Robutnessmentioning

confidence: 99%

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Hybrid model predictive controller for engine air-ratio control

Wong

Iong

et al. 2014

2014 13th International Conference on Control Automation Robotics &Amp; Vision (ICARCV)

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Air-ratio is an important engine parameter which relates closely to engine emissions, power, and brake-specific fuel consumption. Model predictive controller (MPC) is a well-known technique for air-ratio control. This paper utilizes two advanced techniques, discrete wavelet transformation (DWT) and relevance vector machine (RVM), to develop wavelet relevance vector machine model predictive controller (W-MPC) for airratio regulation. To compensate for the modelling error of W- MPC and system disturbances, the W-MPC is proposed to connect in parallel with a proportional-integral (PI) controller so as to form a new hybrid model predictive controller (H-MPC). The proposed H-MPC is implemented on a real engine to evaluate its effectiveness. Its control performance is also compared with the W-MPC without PI controller and the latest MPC for engine air-ratio control in the literature. Experimentalresults show the superiority of the proposed H-MPC over the other two controllers, which can more effectively regulate the airratio to target values under external disturbance. Therefore, the proposed H-MPC is a promising scheme for engine air-ratio control.Keywords-Engine air-ratio, wavelet relevance vector machine, model predictive control, discrete wavelet transform I.

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Section: B Pilot Test 1 -System Robutnessmentioning

confidence: 99%

“…To test the update ability of the H-MPC, the "by pass air valve" was set from 60 to 30%. It is equivalent to clogging the engine intake filter as the engine aging [14]. Normally, the air-ratio must drop under the same throttle as lack of intake air.…”

Section: Pilot Test 2 -Update Abilitymentioning

confidence: 99%

Hybrid model predictive controller for engine air-ratio control

Wong

Iong

et al. 2014

2014 13th International Conference on Control Automation Robotics &Amp; Vision (ICARCV)

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“…Dynamic Mathematical Model of the Electro-hydraulic Variable Valve System In order to determine how structural factors influence the dynamic performance of electro-hydraulic variable valve systems, the dynamic mathematical model of the system is required (Merritt, 1967;Wong et al, 2008).…”

Section: Analysis Of the Stability Of The Electro-hydraulic Variable mentioning

confidence: 99%

Research on the electro-hydraulic variable valve actuation system based on a three-way proportional reducing valve

Liu

Jin

Xie

et al. 2009

Int.J Automot. Technol.

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As the internal combustion engine moves into the 21st century, fully flexible valve actuation systems are being proposed as an enabling technology for advanced internal combustion engine concepts. Electro-hydraulic valve actuator systems are being considered as a potential variable valve technology. Compared to the servo control system, the system using a proportional valve has the advantages of low price, high anti-pollution ability and high reliability. Our research focuses on exploring the dynamic characteristic of the electro-hydraulic variable valve system, which is based on three-way proportional reducing valve. In this paper, the structure and working principles of the system are described. The dynamic mathematical model of the system is derived. From the analysis of a linearized model and dynamic simulation, it is demonstrated that the system will be stable only if the proportional reducing valve has a positive opening. Some structural factors that affect the system's dynamic characteristics, such as input signal, the stiffness of the return spring and the pre-tightening force of the return spring, are studied using AMESim. The experimental results coincide with the theoretical and simulated analyses. Further study shows that the dynamic response can be improved effectively by adopting closed-loop control of valve lift.

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“…The development of an effective variable valve system strongly relies on innovative valve actuators. There are several valve devices that electromechanical valve (EMV) actuators, electro-hydraulic [7]- [10], hydraulic, pneumatic [11], [12] and motor-driven systems [13], [14] have been proposed to implement variable valve timing (VVT). The variable valve timing without camshaft is also called camless valvetrain or electromechanical valve (EMV) system.…”

Section: Introductionmentioning

confidence: 99%

Improvement and Dynamic Analysis of an Electromechanical Valve (EMV) System and Determination of Working Limits at Different Valve Lifts

Birgül¹

2017

ijamec

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Abstract:In four stroke internal combustion engines, the valves control the gas inlet and outlet events. Electromechanical valve (EMV) systems perform the required valve timing independently of the crankshaft position. With this feature, EMV systems have a great potential for increasing engine performance, ensuring optimum fuel consumption and minimizing emissions. The intent of this study was to improve an EMV system, which has 12V supply potential, and to investigate dynamic performance at different lifting valve operations and then to determine the support limits of an internal combustion engine. At the end of the development of the EMV system, the transition time for 6mm valve lift was measured as 3.9 ms. Accordingly, it is evaluated that a four-stroke internal combustion engine can be supported up to 5128 rpm.

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Modeling and simulation of a dual-mode electrohydraulic fully variable valve train for four-stroke engines

Cited by 18 publications

References 15 publications

Hybrid model predictive controller for engine air-ratio control

Hybrid model predictive controller for engine air-ratio control

Research on the electro-hydraulic variable valve actuation system based on a three-way proportional reducing valve

Improvement and Dynamic Analysis of an Electromechanical Valve (EMV) System and Determination of Working Limits at Different Valve Lifts

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