Press Release
Mitsubishi's GDI Engine
03/03/97
Mitsubishi Motors makes stellar leap in automotive technology with GDI engine DETROIT--(BUSINESS WIRE FEATURES) -- Engine Touts Improved Performance, While Increasing Fuel Efficiency by up to 40% Plans to Develop U.S. Version of Revolutionary Engine by Year 2000 Mitsubishi Motors America Inc., a subsidiary of Mitsubishi Motors Corp. in Japan, held a briefing this week on one of the latest innovations in the global automotive industry and gasoline engine technology -- the Mitsubishi Motors In-Cylinder Direct Injection Gasoline (GDI) engine. The company said the new engine, which is in mass production and currently being installed on several of its new cars, has been critically acclaimed and has earned several prestigious international awards for its ability to deliver significant improvements in fuel economy and emissions without sacrificing power. At the briefing, Dr. Hiromitsu Ando, Deputy General Manager of the Engine Research Department at Mitsubishi Motors Corp., one of the main developers of the GDI engine said, "the Mitsubishi Motors in-line, four cylinder 1,834 c.c. GDI is an engine engineers dream. It features 10% more output and torque, faster acceleration, and 35-40% better fuel efficiency during idling and varying speed conditions, compared to conventional MPI engines. In addition, we have been able to control NOx emissions, even while burning a lean fuel-air mixture." The GDI engine is expected to become the cornerstone for the next generation of high efficiency engines and will provide Mitsubishi Motors with a competitive advantage in the global marketplace. Considered the most significant engine technology breakthrough since fuel injection engines 20 years ago, the GDI engine is featured on the new Mitsubishi Motors Galant and Legnum station wagon in Japan. The Mitsubishi Carisma, produced by NedCar in Europe, will also feature the GDI engine later this year. Since September 1996, more than 37,000 vehicles with the GDI engine have been sold. According to Dr. Ando, Mitsubishi Motors plans to develop a U.S. version of the GDI engine by year 2000. Automotive engineers have believed for years that a GDI engine design has the greatest potential for delivering the best performance and lowest fuel consumption. In independent driving tests in Japan, the mid-size 1997 Mitsubishi Galant Sedan with a GDI engine was driven up to 800 miles on one tank of gas (17 gallons) achieving up to 47 miles per gallon (approximately the distance from Detroit to Atlanta without refueling). The GDI engine uses straight upright intake ports, instead of horizontal intake ports found in conventional engines. The upright straight intake ports generate an intense airflow pattern down against curved-top pistons, which then redirect the airflow into a strong reverse tumble for optimal fuel injection. Then, newly developed high-pressure, electromagnetic swirl injectors spray atomized fuel directly into the cylinder into the airflow just before ignition. Before the atomized fuel spray disperses, it vaporizes above the curved-top piston heads and is carried toward the spark plugs in an optimally stratified form. Test results show that the richest mixture of the stratified air-fuel charge concentrates around the spark plugs just prior to ignition, contributing to the ultra-lean fuel-air ratio. In comparison, conventional multi-port injection (MPI) engines mix air and fuel together before injecting them into the intake port of each cylinder. Fuel consumption tests conducted at varying speeds and driving conditions indicate the new Mitsubishi Motors engine uses 35% to 40% less fuel than a conventional MPI engine. The most dramatic effect is at idling speeds, where the new GDI engine's ability to maintain stable combustion offers greater flexibility in setting the idle speed. At 600 rpm, the ultra-lean combustion GDI engine with 40 to 1 air-fuel ratio consumes 40% less fuel than a conventional 14.7 to 1 MPI engine, which idles at about 750 rpm. At a running speed of 40 km/h (about 25 miles/h), the new Mitsubishi Motors engine burns 35% less fuel than a comparably sized conventional engine. In gas-guzzling city driving, the GDI engine consumes 35% less fuel than a conventional engine and even outperforms diesel engines. The outstanding fuel economy of the GDI engine does not adversely affect its power; in fact, it enhances it. Smoother air intake and vaporization of fuel at a late stage of the compression stroke cools the air for better volumetric efficiency and minimizes engine knocking. Another benefit of the new Mitsubishi Motors' engine design is that it provides about 10% greater output and torque at all speeds, compared with conventional MPI engines, and 5% greater acceleration, whether used with manual or automatic transmissions. The Mitsubishi Motors GDI engine also features two combustion modes for maximum flexibility of operation. Under most normal driving conditions, at speeds of up to 120 km/h (about 72 miles/h), the engine operates in the ultra-lean combustion mode in which fuel injection occurs at the latter stage of the compression stroke and ignition takes place at an air-fuel ratio of 1:30 to about 40. At higher speeds, the engine switches to a high-output mode in which fuel injection takes place during the intake stroke. In this mode, combustion is optimized by ensuring a homogeneous, cooler air-fuel mixture that minimizes the possibility of engine knocking. Previous efforts to burn a lean air-fuel mixture have resulted in difficulty to control NOx emission. However, in the case of GDI engine, significant NOx reduction is achieved by utilizing high-rate EGR (Exhaust Gas Ratio) such as 30% that is allowed by the stable combustion unique to the GDI as well as a use of a newly developed lean-NOx catalyst. Established in 1973, Mitsubishi Motors America Inc. is headquartered in Southfield, Mi. and monitors the technical, quality, warranty, purchasing, and marketing areas of the U.S. automotive industry. AWARDS RECEIVED BY MITSUBISHI MOTORS FOR THE GDI ENGINE10/18/95 Design and Technology Award - Most Promising Technology Category; presented by CAR (U.K. automotive magazine) 2/7/96 Energy-Saving Vanguard - Ministry of International Trade and Industry Award; presented by Energy-Saving Center Foundation 4/5/96 Nikkei BP Technology Award, Machine Material category; presented by Nikkei BP (magazine) 12/19/96 96-97 RJR Technology of the Year Award; presented by RJC (Japan Automotive Research and Journalist Committee) 1/30/97 Top Ten New Products of 1996 Award; presented by Nikkan Shinbun (Industrial Daily Newspaper) 2/3/97 1996 Nihon Keizai Shinbun - Outstanding Product/Service Award; presented by Nihon Keizai Shinbun (Japan Economy Newspaper) 2/5/97 Paul Pietsch Award; presented by Auto Motor & Sport (German Automotive Magazine) 2/26/97 Most Outstanding Hi-Tech Award; presented by Sports Nippon Newspaper AWARDS RECEIVED BY MITSUBISHI MOTORS GALANT AND LEGNUM EQUIPPED WITH GDI ENGINE 11/18/96 Grand Champion Award; presented by Apollo Press (automotive magazine) 11/28/96 Car of the Year Award; presented by Japan Car of the Year Executive Committee 12/19/96 Outstanding Automobile Award; presented by RJC (Japan Automotive Researchers and Journalist Committee) 1/9/97 Gekkan Jidosha Award - Most Popular Domestic Passenger Car (monthly automobile magazine); presented by Naigai Press (publishing company) 1/14/97 1996 The Internet Car of the Year - Passenger Car Award; presented by Four By Four Magazine 1/18/97 Car Design Award-Golden Key Trophy; presented by Car Styling Press (automotive magazine) CONTACT: Scott Tangney | LobsenzStevens Inc. for | Mitsubishi Motors America, Inc. | 212/684-6300, ext. 313