Topic
Stroke ratio
About: Stroke ratio is a research topic. Over the lifetime, 48 publications have been published within this topic receiving 409 citations. The topic is also known as: Bore/stroke ratio.
Papers
TL;DR: In this paper, a comprehensive performance analysis and comparison for air-standard irreversible thermodynamic cycle engines (TCE) based on the power output, power density, thermal efficiency, and maximum dimensionless power output (MP), MP, MPI, MPD and maximum thermal efficiency (MEF) criteria is presented.
37 citations
12 Apr 2011
TL;DR: In this article, a new design of a variable compression ratio engine that also permits an expansion ratio that may differ from the compression ratio is presented, which generates an Atkinson cycle effect, and the stroke ratio and the ratio of maximum to minimum in-cylinder volumes may change with load and speed.
Abstract: The Atkinson cycle engine is basically an engine permitting the strokes to be different lengths for improved light loads fuel economies. Variable compression ratio is the technology to adjust internal combustion engine cylinder compression ratio to increase fuel efficiency while under varying loads. The paper presents a new design of a variable compression ratio engine that also permits an expansion ratio that may differ from the compression ratio therefore generating an Atkinson cycle effect. The stroke ratio and the ratio of maximum to minimum in-cylinder volumes may change with load and speed to provide the best fuel conversion efficiency. The variable ratio of maximum to minimum in-cylinder volumes also improves the full load power output of the engine. Results of performance simulations are proposed for a gasoline engine 2 Litres, in-line four, turbocharged and direct injection showings significant fuel savings during light and medium loads operation as well as improvement of full load output and fuel efficiency.
21 citations
Patent•
28 Dec 1988
TL;DR: In this paper, a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system is presented, which includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle.
Abstract: The present invention relates to a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system. The present invention includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle over a wide range of operating conditions.
21 citations
Patent•
9 Mar 1989
TL;DR: An internal combustion engine for automotive vehicles of high performance has a very high cylinder bore to piston stroke ratio and two piston rods engaged with the same piston, which actuate two counter rotating crankshafts with 1:1 driving ratio, so that the large surface of the piston head enables the arrangement of particularly efficient valve and combustion chamber systems combined with an efficiently balanced engine as mentioned in this paper.
Abstract: An internal combustion engine for automotive vehicles of high performance has a very high cylinder bore to piston stroke ratio and two piston rods (2) engaged with the same piston, which actuate two counter rotating crankshafts (4) engaged through gears (5) with 1:1 driving ratio, so that the large surface of the piston head (6) enables the arrangement of particularly efficient valve and combustion chamber systems combined with an efficiently balanced engine.
17 citations
Patent•
21 Feb 2012
TL;DR: In a two-stroke opposed-piston engine, a ported cylinder with a pair of opposed pistons is equipped with an engine brake including an engine braking valve that can be opened to release air from the cylinder as the pistons cycle between BDC and TDC positions.
Abstract: In a two-stroke opposed-piston engine, a ported cylinder with a pair of opposed pistons is equipped with an engine brake including an engine braking valve that can be opened to release air from the cylinder as the pistons cycle between BDC and TDC positions.
16 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 2 |
| 2019 | 3 |
| 2018 | 1 |
| 2017 | 2 |
| 2016 | 5 |
| 2015 | 2 |