GDI engine
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GDI engine
INTRODUCTION
Major Objectives of the GDI engine
WHY NOT CARBURETTOR?

All Internal combustion engines burn fuel in air and every fuel has ideal air ratio at which it will ignite or burn as completely as possible. The challenge that faces engineers is to introduce the perfect or precise proportions of fuel and air required for complete combustion. This is commonly referred to as the stoichiometric ratio. Petrol has a stoichiometric ratio of 14.7:1(14.7 parts of air with 1 part of fuel by weight). This ratio has to be maintained under the varying engine loads and conditions. The carb earlier did this metering with its ancillaries. But the carb has its limits and though performance and economy with modern carbs were acceptable, a seamless power delivery and emissions often suffered
Carburetor has following disadvantages `
Transition of fuel supply
Major characteristics of the GDI engine
Lower fuel consumption and higher output
Realization of lower fuel consumption
Realization of Superior Output
The difference between new GDI and current MPI
For fuel supply, conventional engines use a fuel injection system, which replaced the carburetion system.
MPI or Multi-Point Injection, where the fuel is injected to each intake port, is currently the one of the most widely used systems
Mitsubishi set out to push those limits by developing an engine where gasoline is directlyinjected into the cylinder.
The GDI engine achieved the following outstanding characteristics.
Progress towards higher efficiency and higher output
. The GDI engine achieved the following outstanding characteristics.
Less pumping loss (unthrottled, stratified mode);
Higher compression ratio (charge cooling with injection during induction
Lower octane requirement (charge cooling with injection during induction);
Increased volumetric efficiency (charge cooling with injection during induction);
Improved transient response.
Less acceleration-enrichment required (no manifold film)
More precise air-fuel ratio control
More rapid starting;
Less cold-start over-fueling required.
Extended EGR tolerance limit (to minimize the use of throttling)
Selective emissions advantages
Reduced CO2 emissions
Major Specifications
Technical features

Upright straight intake ports for optimal airflow control in the cylinder
Curved-top pistons for better combustion
High pressure fuel pump to feed pressurized fuel into the injectors
High-pressure swirl injectors for optimum air-fuel mixture
OPERATION
Fuel is delivered to the fuel rail (pressure accumulator) by the high-pressure pump. Hydraulic connections join the fuel rail to the solenoid-operated high-pressure fuel injectors. A closed control loop comprising the fuel pressure sensor, pressure control valve and electronic control unit controls the pressure of the hydraulic system individually for all operating points. The injection pressure, start of injection and injection lime can be freely selected (within predefined limits) for each operating point of the engine. The shape of the injection jet is adapted to the requirements of the engine.
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