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

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.

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Design and Performance of a Variable Valve Timing System on a Highly Turbocharged Diesel Engine—Experimental and Predicted Results

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1243/pime_proc_1996_210_039_02 ◽

1996 ◽

Vol 210 (3) ◽

pp. 249-249

Author(s):

C R Stone ◽

H J Leonard ◽

C Elliot ◽

M J Newman ◽

S J Charlton ◽

...

Keyword(s):

Diesel Engine ◽

Variable Valve Timing ◽

Valve Timing ◽

Turbocharged Diesel Engine ◽

Timing System ◽

And Performance ◽

Variable Valve

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Design and Performance of a Variable Valve Timing System on a Highly Turbocharged Diesel Engine—Experimental and Predicted Results

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1243/pime_proc_1995_209_009_01 ◽

1995 ◽

Vol 209 (4) ◽

pp. 297-311 ◽

Cited By ~ 1

Author(s):

C R Stone ◽

H J Leonard ◽

C Elliott ◽

M J Newman ◽

S J Charlton ◽

...

Keyword(s):

Diesel Engine ◽

High Speed ◽

Reverse Flow ◽

Valve Train ◽

Variable Valve Timing ◽

Valve Timing ◽

Single Cylinder ◽

Cycle Simulation ◽

Timing System ◽

Variable Valve

A previous study using a cycle simulation program had identified the possibility that highly rated diesel engines might benefit from a variable valve timing (VVT) system. In particular, the study had shown that, by delaying the start of inlet valve opening at part load, it should be possible to eliminate the reverse flow that can lead to inlet port fouling. The work reported here encompasses the design and implementation of a variable valve timing system on a highly rated high-speed marine diesel engine. The principal topics addressed are the selection and design of a mechanism, a comparison between the predictions and results from mechanism testing on a single-cylinder valve-train rig and the engine performance predictions and results obtained when the mechanism was tested on the engine. The results from the single-cylinder test rig demonstrated that the mechanism performed satisfactorily, and this led to a design suitable for retro-fitting to the engine. The engine was comprehensively instrumented and the experimental results were in good agreement with the cycle simulation predictions.

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The Meta VVH System - A Continuously Variable Valve Timing System

10.4271/980765 ◽

1998 ◽

Cited By ~ 11

Author(s):

Peter Kreuter ◽

Peter Heuser ◽

Joachim Reinicke-Murmann

Keyword(s):

Variable Valve Timing ◽

Valve Timing ◽

System A ◽

Timing System ◽

Variable Valve

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Modeling and control of an electric variable valve timing system for SI and HCCI combustion mode transition

Proceedings of the 2011 American Control Conference ◽

10.1109/acc.2011.5990625 ◽

2011 ◽

Cited By ~ 2

Author(s):

Zhen Ren ◽

Guoming G. Zhu

Keyword(s):

Variable Valve Timing ◽

Mode Transition ◽

Valve Timing ◽

Combustion Mode ◽

Modeling And Control ◽

Hcci Combustion ◽

Timing System ◽

Variable Valve ◽

And Control

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Development of a Variable Valve Timing System for Improving the Performance of a Small Two Wheeler Engine

10.4271/2006-32-0104 ◽

2006 ◽

Cited By ~ 2

Author(s):

Nitin R. Sheth ◽

A. Ramesh

Keyword(s):

Variable Valve Timing ◽

Valve Timing ◽

Timing System ◽

Two Wheeler ◽

Variable Valve

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Efficiency enhancement of spark-ignition engines using a Continuous Variable Valve Timing system for load control

Energy ◽

10.1016/j.energy.2018.07.009 ◽

2018 ◽

Vol 161 ◽

pp. 649-662 ◽

Cited By ~ 7

Author(s):

Julian D. Osorio ◽

Alejandro Rivera-Alvarez

Keyword(s):

Spark Ignition ◽

Continuous Variable ◽

Load Control ◽

Variable Valve Timing ◽

Spark Ignition Engines ◽

Efficiency Enhancement ◽

Valve Timing ◽

Timing System ◽

Variable Valve

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VAST: A New Variable Valve Timing System for Vehicle Engines

10.4271/980769 ◽

1998 ◽

Cited By ~ 5

Author(s):

W. Hannibal ◽

A. Bertsch

Keyword(s):

Variable Valve Timing ◽

Valve Timing ◽

Timing System ◽

Variable Valve

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

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4036539 ◽

2017 ◽

Vol 139 (10) ◽

Cited By ~ 1

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.

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