Date: Wed, 17 Jun 1998 15:20:10 -0400
Reply-To: Don Gibbons <dgibbons@PRESRAY.COM>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: Don Gibbons <dgibbons@PRESRAY.COM>
Subject: GDI
Content-Type: text/plain; charset=US-ASCII
Just when you thought it was safe.....GDI. (maybe TGI)
Gasoline Direct Injection.
Some of the story:
Under development for 30 years, Gasoline Direct Injection engines
have, at last, become reality. Mitsubishi Motors first introduced GDI
technology to the Japanese market in 1996 and has since built more
than 200,000 of the new engines. A modified design, tailored for
fuels with European levels of sulphur (500 ppm vs 100 ppm in
Japan), is now available.
Conventional petrol engines mix fuel and air outside the combustion
chamber; this air/fuel mixture is always injected at the same moment
in the combustion cycle. GDI, conversely, injects the fuel and air
separately, mixing them inside the cylinder. Depending on power
required by the driver, fuel is injected in differing quantities at
varying times during the cycle for faster response and more
complete power conversion.
How serious is Mitsubishi Motors with regard to Gasoline Direct
Injection? The company reports that every new gasoline engine it
develops in the future will incorporate GDI technology.
GDI is here to stay
Jean-Marc Nozeran, managing director (powertrain) for Siemens
Automotive, expects the new European engine to provide a 15%
fuel saving. As part of the project, Siemens Automotive is
developing a complete direct fuel injection system with speed-based
engine control and exhaust treatment. For the catalytic converters,
the company is collaborating with GKN Automotive in a joint
venture known as EMITEC. It has also established Synerject, a
joint venture with Orbital Engine Corp., for fuel injection systems
development.
German company Robert Bosch is also engaged in developing GDI
engine technology and similarly expects to see the results of its
efforts on the roads by 2000 or 2001, says Otto Holzinger, senior
VP, R&D coordination. One of Bosch's specialties is the GDI
engine management system which instantaneously switches between
homogenous and stratified charge. The company's Motronic MED 7
system aims to achieve this by precisely coordinating the parameters
of air mass, fuel quantity, and ignition angle. An electronically
controlled throttle valve adjusts the air mass.
Full text at: http://www.globaldn.com search for GDI
Pawling NY
Cars I have: 93 Eurovan MV
75 Westy
73 Super
Cars I had: 89 GTi 16v
87 Syncro
83 Rabbit GTi
82 Vanagon Diesel (w 83 GTi engine)