Allows dimethyl ether use in
a 4-cylinder diesel engine
Challenge Saturated Propane Saturated DME
Prototype Research has shown that CIDI 14 Bar, 60° C
(compression ignition, direct
Fuel injection) engines fueled with
10 bar, 25° C
Injection dimethyl ether (DME) can
achieve ULEV exhaust emis-
20 Bar, 30° C
System sions levels while maintaining
the thermal efficiency
of a conventional diesel.
However, the unique physical 2:1 Intensifier
properties of DME present
challenges to its utilization.
DME is a gas at atmospheric Fuel delivery system.
pressure but liquifies under modest pressuriza-
tion. DME also has very low viscosity, leading cylinder. If piston speed is low enough, inlet
to high internal leakage in supply pumps, flow is equal to the piston displacement. If
solenoid valves, and fuel injectors. Such piston speed is high, inlet flow is lower than
limitations require that significant modifications the piston displacement; the fuel vaporizes
be made to conventional fuel injection and then re-liquifies upon compression by
equipment to accommodate the use of DME the piston. When all of the fuel is liquefied,
in a diesel engine. pressure rises and fuel flows out.
Description The pump has been integrated into a complete
common rail fuel system and packaged for
A high efficiency, variable displacement axial use on a Ford DIATA engine. Additional fuel
piston fuel pump has been designed for use system components have been designed. These
in DME fueled CIDI engines. The wobble include: fuel injector assembly, rail pressure
plate actuated pump design permits variable
Contacts displacement through inlet throttling and high
and back pressure control valve mountings,
fuel filter, supply and return lines, and fuel
Lucito Cataquiz efficiency (low leakage) through positive tank assembly.
Manager, Alternative Fuels sealing.
202-586-0729 A uniquely designed
fuel tank delivers liquid
firstname.lastname@example.org DME under pressure of s CIDI engines have the
10 bar to the pump. A highest thermal efficiency of
cam actuated intensifier any demonstrated automo-
increases fuel pressure tive power plant.
303-275-4468 supplied to the throttle
s DME fueled engines could
303-275-4415 fax inlet to 20 bar. As the
limit harmful emissions
email@example.com piston strokes down,
without sacrifice to engine
fuel flows through the
throttle and into the
Variable displacement fuel pump.
April 2001 http://www.ott.doe.gov/success.html
Emissions and performance demonstrations are underway using the developed fuel system installed
on a Ford DIATA CIDI engine fueled with DME.
Partners in Success
s AVL Powertrain Technologies, Inc.
s Ford Motor Company
s National Renewable Energy Laboratory