The Experts below are selected from a list of 4245 Experts worldwide ranked by ideXlab platform
Forrest W Flocker - One of the best experts on this subject based on the ideXlab platform.
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addressing Cam wear and follower jump in single dwell Cam follower systems with an adjustable modified trapezoidal acceleration Cam Profile
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2009Co-Authors: Forrest W FlockerAbstract:Presented is a modified trapezoidal Cam Profile with an adjustable forward and backward acceleration. The Profile is suitable for single-dwell Cam and follower applications. The main benefit of the Profile is that it allows Cam designers to choose easily a value for the maximum forward or maximum backward acceleration to achieve design objectives. An additional benefit of the Profile is that it has a continuous jerk curve. Follower acceleration is one of the primary factors affecting Cam wear and follower jump, two main concerns of Cam designers. Large forward acceleration against a load creates Cam-follower interface forces that can cause excessive wear. Backward acceleration tends to reduce the Cam-follower interface force, and if the backward acceleration is sufficiently large, separation between the Cam and follower ("follower jump") can occur. The Cam Profile presented in this paper gives Cam designers an easy way to adjust the maximum forward or backward acceleration to prevent these problems.
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addressing Cam wear and follower jump in single dwell Cam follower systems with an adjustable modified trapezoidal acceleration Cam Profile
2008 Spring Technical Conference of the ASME Internal Combustion Engine Division, 2008Co-Authors: Forrest W FlockerAbstract:Presented is a modified trapezoidal Cam Profile with adjustable forward and backward acceleration. The Profile is suitable for single-dwell Cam and follower applications. The main benefit of the Profile is that it allows Cam designers to choose easily a value for the maximum forward or maximum backward acceleration to achieve design objectives. An additional benefit of the Profile is that it has a continuous jerk curve. Follower acceleration is one of the primary factors affecting Cam wear and follower jump, two main concerns of Cam designers. Large forward acceleration against a load creates Cam-follower interface forces that can cause excessive wear. Backward acceleration tends to reduce the Cam-follower interface force, and if the backward acceleration is sufficiently large, separation between the Cam and follower (“follower jump”) can occur. The Cam Profile presented in this paper gives Cam designers an easy way to adjust the maximum forward or backward acceleration to prevent these problems.Copyright © 2008 by ASME
Zhai Shuang - One of the best experts on this subject based on the ideXlab platform.
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Design Method on Non-Symmetrical Valve-Train Cam Profile of High-Speed Vehicular Engines
Journal of Hunan University, 2003Co-Authors: Zhai ShuangAbstract:The necessity of using nonsymmetrical valvetrain Cam Profile on highspeed vehicular engines was analyzed. The advantages of nonsymmetrical valvetrain Cam Profile were described and the analytical functions of nonsymmetrical valvetrain Cam Profile were conducted. The result of calculation improves that it really can not only offer enough ample factor, but also make the seating velocity and acceleration of the valve lower by using nonsymmetrical valvetrain Cam Profile.
J W G Turner - One of the best experts on this subject based on the ideXlab platform.
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Cam Profile switching cps and phasing strategy vs fully variable valve train fvvt strategy for transitions between spark ignition and controlled auto ignition modes
SAE 2005 World Congress & Exhibition, 2005Co-Authors: Nebojsa Milovanovic, Blundell Dave, Stephen Gedge, J W G TurnerAbstract:In a future 'hybrid' mode internal combustion engine capable of running in spark ignition (SI) and controlled auto ignition-CAI (also known as Homogeneous Charge Compression Ignition-HCCI) modes, transition between these modes, during changes in engine load and speed, will play a crucial role. The valve train and engine management system (EMS) must provide a fast and smooth transition between these two very different combustion modes keeping all relevant engine and combustion parameters in an acceptable range. In order to obtain such transition between SI and HCCI and SI, a valve event (duration, timing and lift) has to be variable, which consequently leads to high demands on the valve train and therefore a need for its higher degree of flexibility. Two valve train concepts, one with a Cam Profile Switching (CPS) and phaser system and the other Camless using Fully variable Valve Train (FVVT) are presented. The use of both concepts for transitions from SI to HCCI to SI are experimentally investigated on a single cylinder research engine fuelled with commercially available gasoline fuel (95 RON). Experimental results obtained together with benefits and obstacles in using each of these strategies are presented and discussed. .
Fu Guang-qi - One of the best experts on this subject based on the ideXlab platform.
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The Design on Unsymmetrical Valve-Train Cam Profile of High-Speed Vehicular Diesel Engines with High-Order Polynomial
Transactions of Csice, 2001Co-Authors: Fu Guang-qiAbstract:In this paper,the analytical functions of unsymmetrical Cam Profile with high-order polynomial have been conducted,a program of Cam Profile design has been compiled and taking a vehicular diesel engine with overhead Cam as an example,an unsymmetrical Cam Profile design has been conducted.The calculation example shows that unsymmetrical Cam Profile can not only maintain a rather high ample factor,but also make the declining part of lift curve change evenly,make the seating velocity and acceleration of the valve lower,and make the maximum velocity and maximum acceleration of valve reduce obviously at the declining part.
Nebojsa Milovanovic - One of the best experts on this subject based on the ideXlab platform.
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Cam Profile switching cps and phasing strategy vs fully variable valve train fvvt strategy for transitions between spark ignition and controlled auto ignition modes
SAE 2005 World Congress & Exhibition, 2005Co-Authors: Nebojsa Milovanovic, Blundell Dave, Stephen Gedge, J W G TurnerAbstract:In a future 'hybrid' mode internal combustion engine capable of running in spark ignition (SI) and controlled auto ignition-CAI (also known as Homogeneous Charge Compression Ignition-HCCI) modes, transition between these modes, during changes in engine load and speed, will play a crucial role. The valve train and engine management system (EMS) must provide a fast and smooth transition between these two very different combustion modes keeping all relevant engine and combustion parameters in an acceptable range. In order to obtain such transition between SI and HCCI and SI, a valve event (duration, timing and lift) has to be variable, which consequently leads to high demands on the valve train and therefore a need for its higher degree of flexibility. Two valve train concepts, one with a Cam Profile Switching (CPS) and phaser system and the other Camless using Fully variable Valve Train (FVVT) are presented. The use of both concepts for transitions from SI to HCCI to SI are experimentally investigated on a single cylinder research engine fuelled with commercially available gasoline fuel (95 RON). Experimental results obtained together with benefits and obstacles in using each of these strategies are presented and discussed. .
