Title: THE MITSUBISHI... GASOLINE DIRECT INJECTION ENGINE (GDI)
Abstract: This article describes the gasoline direct injection (GDI) engine, which Mitsubishi is introducing. The engine operates in three distinct air-fuel mixture modes. In the idle and partial load operating condition, the air-fuel ratio can exceed 100, and completely unthrottled operation is possible. In practice, the engine is throttled slightly, and the air-fuel ratio is controlled between 30 and 40 to introduce extensive exhaust gas recirculation. For medium loads, the ratio is controlled between 20 and 25 to obtain optimal fuel economy. For higher loads, the mixture is either stoichiometric or very slightly rich to reduce exhaust temperatures and protect the three-way catalyst. To obtain the required combustion characteristics, the engine uses a combination of sophisticated electromagnetic swirl injector, 'reverse tumble' in-cylinder flow, and a spherical compact piston cavity. The fuel injection modes are often switched and the torque must be kept constant to achieve even driving. Compared with a diesel engine of comparable capacity, the new GDI engine has approximately 7% better fuel economy, 85% more power, 12 higher maximum torque, 10dB lower noise levels at all speeds, 8% less weight, and 40% lower production cost.
Publication Year: 1996
Publication Date: 1996-01-01
Language: en
Type: article
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Cited By Count: 4
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