Research Papers: Internal Combustion Engines

Optimization Method and Simulation Study of a Diesel Engine Using Full Variable Valve Motions

[+] Author and Article Information
Yong Lu

College of Power and Energy Engineering,
Harbin Engineering University,
Harbin 150001, Heilongjiang, China
e-mail: luyong0806@126.com

Daniel B. Olsen

Department of Mechanical Engineering,
Colorado State University,
Fort Collins, CO 80523
e-mail: Daniel.Olsen@ColoState.EDU

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 13, 2016; final manuscript received December 16, 2016; published online March 7, 2017. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(7), 072804 (Mar 07, 2017) (8 pages) Paper No: GTP-16-1532; doi: 10.1115/1.4035736 History: Received November 13, 2016; Revised December 16, 2016

Variable valve timing technologies for internal combustion engines are used to improve power, torque, and increase fuel efficiency. Details of a new solution are presented in this paper for optimizing valve motions of a full variable valve actuation (FVVA) system. The optimization is conducted at different speeds by varying full variable valve motion (variable exhaust open angle, intake close angle, velocity of opening and closing, overlap, dwell duration, and lift) parameters simultaneously; the final optimized valve motions of CY4102 diesel engine are given. The CY4102 diesel engine with standard cam drives is used in large quantities in Asia. An optimized electrohydraulic actuation motion used for the FVVA system is presented. The electrohydraulic actuation and optimized valve motions were applied to the CY4102 diesel engine and modeled using gt-power engine simulation software. Advantages in terms of volumetric efficiency, maximum power, brake efficiency, and fuel consumption are compared with baseline results. Simulation results show that brake power is improved between 12.8% and 19.5% and torque is improved by 10%. Brake thermal efficiency and volumetric efficiency also show improvement. Modeling and simulation results show significant advantages of the full variable valve motion over standard cam drives.

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Fig. 1

Overall schematic of the model from gt-power

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Fig. 2

Comparison of data obtained from experiments and model simulations at 1900 rpm: (a) pressure versus crank angle and (b) intake port static pressure versus crank angle

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Fig. 3

Comparisons between the profile of base cam and camless

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Fig. 4

FVVA model from AMESim

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Fig. 5

Configuration of optimized FVVA: 1—thread bolt, 2—spring, 3 and 4—cone piston, 5—valve interface, 6—body frame, 7—hydraulic pipe, 8—flange, 9—valve interface, 10—actuator chamber, 11—hydraulic pipe, 12—valve interface, 13—top chamber, 14—connect rod, 15—top piston, and 16—hydraulic pipe

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Fig. 6

Valve event performance parameters for a given cycle: (a) control signals of valve events, (b) valve profile at different engine speeds, and (c) seating velocity at different engine speeds

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Fig. 7

Comparisons of optimization results and baseline results: (a) power versus engine speed, (b) torque versus engine speed, (c) brake thermal efficiency versus engine speed, and (d) volumetric efficiency versus engine speed

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Fig. 8

Comparison of air flow rates into the engine

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Fig. 9

Comparison of optimized and baseline energy losses: (a) friction mean effective pressure versus engine speed and (b) pumping mean effective pressure versus engine speed




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