lim technology - scdi engine - fuel efficient engine

1Copyright © 2008 LIM Technology LLC – All rights reserved - Unauthorized distribution or reproduction is forbidden

Simpler, Smaller, Smarter

» SCDi engine


Description of the SCDi engine

Single cylinder cutaway view of a Simple Cycle engine

No exhaust valveNo camshaftNo valve train

Interceptor ring

Air input valve

Cylinder

Exhaust PortsCompressor(or Blower)

Piston

Crank Case

Crank Shaft

Oil

Fuel Injector

Patented by LIM Technology, L.L.C.


Main features

Pressurized intake manifold, either turbocharged or supercharged

Intake valves actuated by dynamic pressure differential between the cylinder and air supply manifold

Exhaust ports around the cylinder just above the top of the piston-at-BDC

Direct fuel injection

Compression ignition

No exhaust valves, no spark plug or glow plug, no camshaft mechanism


Major improvements

3 events- The sequences of a typical four-stroke engine are slightly modified, making

the SCDi engine work in 3 events only: Ventilation, Compression, Power.

Fewer parts- No exhaust valve, no camshaft, no valve train.

New patented intake valve- Conventional valves are replaced by a new valve train developed by LIM.- No lubricant required for valve; no oil mixed with fuel.

Uniflow air system management- Cylinder head is used for air intake only, whereas exhaust is through ports

around the girth of the cylinder.- This co-axial ventilation tends to push more completely the waste products

from the previous cycle out through the exhaust, as compared to loop scavenged conventional two stroke engines.

- A cooler charge of air is delivered to the cylinder, and compressed more immediately after induction, promoting a cooler cycle.


The Simple Cycle step by step

Intake valve

CylinderExhaust port

Piston

Crankcase

Crankshaft

Oil

VENTILATION COMPRESSION COMBUSTION VENTILATION

B D C 40o past BDC 60o past BDC T D C 120o past TDC 170o past TDC

•

Valves fully open

•

Blow-down complete

•

Air continues pushing exhaust out thru ports

•

Compression begins

•

Exhaust ports closing

•

Intake air still entering cylinder

•

Compression well underway

•

Some air still entering cylinder

•

Valves begin closing

•

Valves closed

•

Air fully compressed

•

Fuel is injected

•

Combustion begins

•

Valves closed•

Injection complete

•

Power stroke ending soon

•

Valves opening •

Blow-down begins

•

Air from manifold begins pushing exhaust out thru ports

Turbocharger


Temperature diagram within the cylinder

Air flow circulation within the cylinder during air exchange

cylinder

Air flow circulationCold Hot

Air flow temperature

Air intake

Exhaust of waste products

Caption

Conventional four-stroke engine

Exhaust(25% of cycle)

Intake(25% of cycle)

PistonPiston

(Time for air exchange = 50% of cycle)SCDi engine

Ventilation –beginning

Ventilation –end

Piston Piston

(Time for air exchange = 30% of cycle)


Version 1 : spring valve

The smart valve is mainly actuated by the air pressure differencebetween the manifold and the cylinder

The spring brings an additional force to control timing at opening andclosing.

Patented by LIM Technology L.L.C.


Version 2 : pneumodromic valve

Single cylinder cutaway view of a theoretical LIM type engine with a pneumodromic valve

Pneumodromic valve

Cylinder

Exhaust PortsCompressor(or Blower) Piston

Crank Case

Crank Shaft

Oil

Fuel injector (hidden)Rotating disk with a hole

Valve control chamber

Input manifold

“Air intake” pipe

Patented by LIM Technology LLC


Less mass, simpler structure

Reciprocating mass of the smart valve assembly is about 1/4th

that of the conventional assembly, with proportionally less friction.

Smart valve Conventional valve assembly

Spring

Valve

Valve

Spring

Camshaft

Hydraulic compensator

Rocker arm

Size comparaison between a smart valve and a LR6 battery (1.5V)


SCDi advantages compared to a conventional 4 stroke engine

Smaller and lighter engines

Total weight reduced about 40% Fewer parts (no camshaft, no exhaust valve…)Smaller and lighter intake valve (1/4th)

More power, less fuel consumption

Less friction, smaller inertial losses Torque and horsepower increased up to 100%Slower idle (50% less)At least 15% less fuel consumption

Environment friendly

Variable valve timing provides better control over internal combustion

Less CO2 and pollutants (NOx, PM…) emissionsLess noise

Lower costs

Flexible technology

Lower production cost (about 30% less)Lower operating and maintenance costEngine downsizing

Any type of fuel (diesel/gasoline/biofuels)


Less Is More !

SCDi engine is just « simpler, smaller and smarter » !

Over 30% savings on the production cost of 1 HP

Engine

Four-stroke SCDiA B C E F

A B D E F

Capacity 2.5 L 2 L

Cylinders V6 4

Camshaft Yes (Dual overhead) No

Valves 24 16

Power 185 HP 200 HP

Total Cost > $ 2 500 ~ $ 1 800

Cost of 1 HP $ 13.5 $ 9


Our 2.6L prototype configuration

Main features- 3 cylinders, 2605 cc- 4 intake valves per cylinder- Bosch fuel pump and injectors –

digital management by TECAT - Supercharger : Eaton 90 cu.in.

Roots type

Rough prototype- Conversion of a Detroit Diesel

3-53- many components diverted

from their original usage » and therefore not always

adequate, resulting in lower performances


Prototype performance

Next target : < 200(Current results obtained from a rough prototype)

Peak Fuel Economy Peak Power OutputSpeed rpm 1800 2150

Indicated Power ch DIN 172,4 235,2Brake Power ch DIN 130,1 166,1Supercharger Power ch DIN 24,5 45,1Indicated Power Kw 126,5 172,8Brake Power Kw 95,7 122,2Supercharger Power Kw 18,0 33,2

Torque N.m 507,5 542,7BMEP atm 12,1 12,8Engine ISFC g/Kwh 166,7 155,1System BSFC g/Kwh 220,1 230,5

Air Flow Kg/s 0,1453 0,1858Fueling Rate Kg/s 0,0058 0,0078Coolant Heat Rejection kW 82,7 109Exhaust Gas Temp °K 638 696Boost Pressure atm 2,39 2,91Peak In-Cyl Pressure atm 170 190


Next steps

Partner with an engine manufacturer to achieve R&D development

Short term objective : design and test a brand new prototype - With dedicated parts (die cast block…)

- Including new features

» Turbocharger for higher boost pressure

» New devices for better valve management (timing and lift control)

» Ports optimization

» EGRetention

- Anticipated results

» BSFC : below 200 g/Kwh


Interested ?

We look for Investors

Help us to develop our new clean and fuel efficient engine and get a fantastic return on investment

Contact:

Jeffrey F. KleinCEO+1 410-760-8801

[email protected]

www.limtechnology.com

www.fuel-efficient-engine.com

Contact:

Jeffrey F. KleinCEO+1 410-760-8801

[email protected]

www.limtechnology.com

www.fuel-efficient-engine.com

lim technology - scdi engine - fuel efficient engine

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