Five-stroke engine
The five-stroke engine is a compound internal combustion engine patented by Gerhard Schmitz in 2000.[1] Schmitz's concept is being developed by Ilmor Engineering. Ilmor's prototype is an internal combustion engine that uses a solid cylinder block with electric motors driving the oil and water cooling pumps. The prototype uses two overhead camshafts with standard poppet valves. The five-stroke prototype engine is turbocharged. The goal of the five-stroke engine is to have higher efficiency with lower fuel use. In order to increase efficiency, a secondary cylinder is added as an expansion processor to extract more energy from the fuel.
Gerhard Schmitz's concept engine uses two high pressure (HP) fired cylinders with standard four-stroke engine power cycles. The exhaust gas from the two HP work cylinders is fed into a one larger central low pressure (LP) expansion cylinder. The hot exhaust is used to produce more power.
It is a usage of Exhaust Gas from two primary Cylinder which shift to one secondary cylinder which is non ignition. Because the volume of gases reduced to half in primary cylinders after combustion.
The operation of a 5-stroke SI engine.
1 – Induction
2 – Compression
3 – Power
4 – Initial Exhaust/Re-expansion
5 – Final Exhaust
The low pressure expansion cylinder is adjustable to maintain the best expansion ratio, regardless of the compression ratio. The prototype has produced very good fuel consumption over a standard gas engine, by about 10%.[2][3][4][5][6]
This concept is similar to that of compound steam engines, which expand steam in high pressure cylinders before exhausting it into low-pressure cylinders in order to extract more energy from the steam. Nicolaus Otto built in 1879 a 5-stroke engine with same arrangement as Ilmor, but customers returned it due to poor performance. 'The romance of engines', T Suzuki, SAE, pp 87–93.[7] Two Spanish patents, ES0156621, F Jimeno-Cataneo, 1942; and ES0433850, C Ubierna-Laciana, 1975; describe 5-Stroke engines identical to that of Gerhard Schmitz, this engine had a fellowship to Burgundy University to be studied. JW Eisenhuth patented, US640890, 1900, an 'Air and gas engine', with double expansion. A car with this engine was in exhibition in Harrah collection, fate of car after the collection was dismantled is unknown.
Contents
Applications
A planned motorcycle design from Ilmor Engineering 1,478 cc totally 3 cylinder (HP and LP cylinders) uses a five-stroke engine.[citation needed]
Advantages
- For a gasoline engine, the engine has an expansion ratio near that of diesel engine, about 14.5:1.
- Adjustable compression.
- Higher mean effective pressure with less fuel, due to expansion cylinder.
- Use standard engine parts, no special one of a kind parts.
- In theory, additional water injection can be used for cooling the cylinder walls. It leads to quick steam expansion and can increase the efficiency of the expansion cylinder.
Disadvantages
- Increased costs due unique design. Not yet mass-produced.
- Two different cylinder sizes.
- More complex than 2 cylinder engine.
Specification
- Current prototype is for motorcycle use.
- 3 cylinder (two high pressure and one low pressure)
- 700 cc 2 HP cylinder
- 1478 cc total 3 cylinders (HP and LP)
- 130 horsepower @ 7000rpm
- 166 Nm @ 5000rpm
- 226g/kWh BSFC
See also
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References
- ↑ Google Patents, Five-stroke internal combustion engine, US 6553977 B2, filled Oct 26, 2001
- ↑ Ilmor, 5 Stroke Engine
- ↑ Five stroke engine animation
- ↑ 5-stroke-engine.com, The five-stroke concept – ingeniously simple, simply ingenious
- ↑ autoevolution.com, Five-Stroke Engine Works and Might Enter Production. 26 Sep 2014, by Gabriel Brindusescu
- ↑ Ilmor 5 Stroke Engine – 700cc Turbo 3 Cylinder – 130 bhp, Better Mileage, Less Weight, By Paul Crowe
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Four stroke engine animation
- Detailed Engine Animations Archived 2017-06-25 at the Wayback Machine
- How Car Engines Work
- Animated Engines, four stroke Archived 2011-11-10 at the Wayback Machine, another explanation of the four-stroke engine.
- New 4 stroke
