Valve Train Design For Multivalve Automotive Gasoline Engines

Heath, A. R.

doi:10.4271/885133

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…When using a symmetrical profile the number of unknown variables reduces to 17 and the sixth segment may be calculated from the length of the first five segments and the overall duration. The decision to use an asymmetrical profile is at the discretion of the designer, but it is often necessary to reduce the valve seating velocity, [4,5] or to account for tappet leakdown [6]. Only symmetric profiles were evaluated in this paper for the reasons of relative simplicity and reduced computational time.…”

Section: Table 1 User Defined Parameters For Lift Profile Generationmentioning

confidence: 99%

Valve Lift Profile Development and Optimization Using Matlab

Cameron¹,

Minaker²

2013

SAE Int. J. Engines

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The focus of this paper is the development and modelling of a reverse-poppet valve train assembly, placing a major emphasis on the optimization routine used to develop a short-duration camshaft profile. A user-programmable script, known as the penalty function, was written to assign weighted numeric values to certain parameters associated with the valve lift profile and its derivatives. These design parameters include maximum acceleration, peak lift, area under the lift curve and minimization of jerk. Optimization tools built into Matlab were then used to generate a profile which minimizes the overall 'penalty' associated with each parameter as it deviates from a user-defined ideal.A commercially available multi-body dynamics software package was used to evaluate the dynamic performance of the valve train incorporating the generated cam profile. A flexible-body spring element provided insight into spring surge and coil contact. Comparisons of the designed and simulated lift, velocity and acceleration profiles are given.

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Section: Table 1 User Defined Parameters For Lift Profile Generationmentioning

confidence: 99%

Valve Lift Profile Development and Optimization Using Matlab

Cameron¹,

Minaker²

2013

SAE Int. J. Engines

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Multi-Valve High-Speed Direct Injection Diesel Engines—the Design Challenge

Gilbert

Heath

Johnstone

1993

Proceedings of the Institution of Mechanical Engineers, Part D:

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The need to increase power, to improve fuel economy and to meet stringent exhaust emissions legislation with a high level of refinement has provided a challenge for the design of a compact high-speed direct injection (HSDI) diesel engine. This paper describes various aspects of cylinder head design with particular consideration of layout and number of valves, valve actuation, port selection strategy, fuel injection systems and cylinder head construction.

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A Valvetrain Design Analysis Tool with Multiple Functionality

Keribar

2000

SAE Technical Paper Series

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Valve Train Design For Multivalve Automotive Gasoline Engines

Cited by 6 publications

References 4 publications

Valve Lift Profile Development and Optimization Using Matlab

Valve Lift Profile Development and Optimization Using Matlab

Multi-Valve High-Speed Direct Injection Diesel Engines—the Design Challenge

A Valvetrain Design Analysis Tool with Multiple Functionality

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