DENSO Develops a New Diesel Common Rail System with the World's

DENSO Develops a New Diesel Common Rail System with the World's Highest
Injection Pressure 
- Improved fuel efficiency and cleaner exhaust emissions - 
Kariya, Japan, June 26, 2013 - (JCN Newswire) -  Global automotive supplier
DENSO Corporation has developed a new diesel common rail (DCR) fuel injection
system with the world's highest* injection pressure of 2,500 bar. Based on
DENSO's research, the new system can help increase fuel efficiency by up
to 3 percent while also reducing particulate matter (PM) by up to 50 percent
and nitrogen oxides (NOx) by up to 8 percent. This is compared to DENSO's
previous generation system. The new DCR system will launch-to-market later this
year on passenger, commercial, agricultural and construction vehicles
"Our new diesel common rail system will help increase fuel efficiency and
meet exhaust emissions standards that are becoming increasingly stringent
around the world, particularly in Europe, Japan and the United States,"
said Yukihiro Shinohara, executive director responsible for DENSO's Diesel
Engine Business Unit. 
Improved design structure to decrease workload of fuel pump:
- In a common rail system, a portion of the fuel delivered from the fuel pump
to the injectors is used for purposes such as lubricating system components.
- That fuel is then returned back to the fuel tank, which puts an additional
load on the fuel pump, instead of being injected into the engine combustion
- By improving the design structure of the injector, fuel pump, and common
rail, DENSO significantly decreased the workload of the fuel pump by reducing
the amount of fuel that was sent back to the fuel tank by about 90 percent. 
Higher Injection Pressure:
- To generate a higher fuel injection pressure, DENSO redesigned components
and used new materials.
- These changes allowed the fuel to atomize into finer droplets, which
improved fuel ignition and combustion efficiency, resulting in increased fuel
economy and cleaner exhaust emissions. 
Size Matters:
- As automakers have limited space for component integration, DENSO was able
to engineer and manufacture a fuel pump that is similar in size but more
efficient than the previous system.
- DENSO was able to accomplish this by reducing the workload of the fuel
First to Commercialize Diesel Common Rail Systems:
- DENSO was the first in the world to commercialize diesel common rail systems
in 1995.
- In 2002, DENSO offered an 1800 bar common rail system, the world's
highest injection pressure at the time.
- In 2008, DENSO released a 2,000 bar model into the market.
- In 2012, DENSO commercialized the world's first engine control system
called intelligent-Accuracy Refinement Technology (i-ART), in which the
injectors have a built-in pressure sensor to measure fuel injection pressure in
real time and control the fuel injection quantity and timing of each injector. 
Future Development 
DENSO is working to develop and commercialize a 3,000 bar diesel common rail
system. The company will continue to develop products and technologies that
help improve the performance of diesel-powered vehicles to reduce its impact on
the environment. 
About Diesel Common Rail Systems 
A diesel common rail system is the mainstream fuel injection system for diesel
engines. The fuel, which is highly compressed by the fuel pump, is stored in an
accumulator called a common rail. Then it is sprayed through the electrically
controlled injectors into the combustion chambers. Storing highly compressed
fuel in the common rail, not only further increases the pressure of the fuel,
but also controls fuel injection pressure and timing without being effected by
the engine's rotation speed. 
About Denso 
DENSO Corporation, headquartered in Kariya, Aichi prefecture, Japan, is a
leading global automotive supplier of advanced technology, systems and
components in the areas of thermal, powertrain control, electric, electronics
and information and safety. Its customers include all the world's major
carmakers. Worldwide, the company has more than 200 subsidiaries and affiliates
in 35 countries and regions (including Japan) and employs over 120,000 people.
Consolidated global sales for the fiscal year ending March 31, 2012, totaled
US$38.4 billion. Last fiscal year, DENSO spent 9.5 percent of its global
consolidated sales on research and development. DENSO common stock is traded on
the Tokyo and Nagoya stock exchanges. For more information, go to, or visit our media website at 
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