VIENNA, May 15, 2019 /PRNewswire/ -- In a paper
presented at the 2019 Vienna Motor Symposium (May 16-17), Delphi Technologies will reveal a new
500+ bar GDi system that can reduce particulate emissions by up to
50 percent compared to state-of-the-art 350 bar system without
expensive engine design modifications. Reducing the number of
exhaust gas particulates, including those smaller than 23 nm,
will help manufacturers meet increasingly stringent future global
emissions standards.
Reducing engine-out emissions cuts tailpipe emissions in the
crucial period before catalyst light-off and reduces the need
for costly aftertreatment systems. This reduces emissions in
regulated testing including RDE (Real Driving Emissions). At
the end of 2016, Delphi Technologies entered production with its
industry first 350 bar GDi system, which reduces exhaust
particulates by up to 70 percent compared with industry-standard
200 bar systems.
"The industry has long recognized that increasing injection
pressure to 500+ bar could substantially cut engine-out
particulates while improving CO2 emissions and fuel
economy," explains Walter Piock, chief engineer, Gasoline Systems,
Delphi Technologies.
The challenge has been to achieve such pressures without
increasing the drive loads from the pump. As most engines power the
GDI pump through the camshaft drive, a conventional approach would
usually require a costly redesign and strengthening of the camshaft
mechanism.
"By designing an innovative new internal sealing system for our
GFP3 500+ bar pump, in some applications, we have designed a
downsized plunger diameter which prevents increasing the loads in
the drive mechanism," reveals Piock.
With the new Delphi Technologies system, engine designers can
benefit from 500+ bar injection pressures without having to
make costly changes to the majority of existing camshaft drive
systems.
With combined demands for improved urban air quality and lower
greenhouse gas emissions, the fuel injection system is an important
building block for meeting future legislative targets. Delphi
Technologies' 500+ bar system can help vehicle manufacturers meet
both challenges.
According to Piock, "Our 350 bar GDi system reduces exhaust
particulates by up to 70 percent compared with industry-standard
200 bar systems and we are going one step further with our new
500+ bar GDi system which further reduces these emissions by up to
50 percent compared to the 350 bar system".
To complete the new 500+ bar system, Delphi Technologies
has developed all system components including Multec 16
injectors, pumps, forged rail as well as the appropriate engine
control system and software. These components, which further
improve durability and reliability, also require no or only minor
physical changes to existing engines because they match existing
packaging constraints and interfaces. The 500+ bar system could be
used in production from 2022 onwards.
High Pressure Natural Gas Injection for Heavy Duty
Vehicles
A second paper at the symposium, co-authored by Westport Fuel
Systems and Delphi Technologies, will describe the innovative
Westport High Pressure Direct Injection HPDI 2.0TM
system. This advanced system reduces tank-to-wheel CO2
emissions in heavy-duty commercial vehicles through the use of high
pressure natural gas.
The HPDI 2.0 system in the field today delivers a CO2
reduction of up to 20 percent. In the case of renewable natural
gas, the system can achieve a reduction of almost 100 percent.
Countries around the world are implementing strategies to reduce
CO2 emissions. In April
2019, new regulations were brought into force in the EU
mandating heavy truck Original Equipment Manufacturers (OEMs) to
provide a 15 percent reduction in average CO2 emissions
per truck by 2025 and a 30 percent reduction by 2030, both from a
2019 baseline.
The Westport HPDI 2.0TM system can be installed on
current technology heavy-duty diesel engines and trucks with
minimal change to these proven products. By providing an up
to 20 percent CO2 reduction, the Westport HPDI
2.0TM system provides OEMs with a path to make their
current trucks compliant with the EU regulations through
2029.
Delphi Technologies' proprietary control valve strategy, enables
the delivery of a small pilot injection of diesel followed by a
larger main injection of natural gas through Westport's novel duel
concentric needle nozzle. The individual diesel pilot sprays
auto-ignite, providing multiple ignition sources that are spatially
distributed, ensuring consistent ignition of the natural gas jets.
The natural gas combustion then proceeds in a predominantly
non-premixed fashion. As a result, engine knock is eliminated and
the base diesel engine's compression ratio can be retained. Because
the natural gas is not premixed, load control is achieved by simply
reducing the fuel flow, as in a conventional diesel; part-load
throttling is not required.
"Combustion of natural gas in a diesel cycle delivers equivalent
power density and combustion efficiency to that of conventional
diesel," said James Kewley, product engineering director,
Diesel Fuel Injection Systems and ICE components, Delphi
Technologies. "This enables the exploitation of the lower
CO2 potential of natural gas without the penalty
associated with moving to the Otto cycle. It will help OEMs cope
with the increasingly demanding regulations, particularly as
pressure grows to further reduce CO2 emissions from
heavy duty trucks."
At the symposium
Delegates at the symposium will also
be able to see Delphi Technologies' latest vehicle propulsion
systems for traditional, hybrid and electric light and commercial
vehicles.
These include the latest technologies to support OEMs across the
globe on their path to electrification, with automotive grade
solutions, able to withstand a harsh and volatile environment, such
as extreme temperatures, moisture, salt, vibration and all kinds of
fluid, over the life of the vehicle.
About Delphi Technologies
Delphi Technologies is a
technology company focused on providing electric vehicle and
internal combustion engine propulsion solutions, in addition to
solving emissions and fuel economy challenges for the world's
leading automotive OEMs. Delphi Technologies also provides leading
aftermarket service solutions for the replacement market. With
headquarters in London, U.K.,
Delphi Technologies operates technical centers, manufacturing sites
and customer support services in 24 countries. Visit
www.delphi.com.
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SOURCE Delphi Technologies