Gasoline Direct Injection Engine

I. Introduction

II.Major Objectives of the GDI engine
1.The difference between new GDI and current MPI
2.Outline
3.Technical features

III. Major characteristics of the GDI engine
1.Lower fuel consumption and higher output
2.Realization of lower fuel consumption
3.Realization of Superior Output

3 . Realization of Superior Output

(1) Basic concept

To achieve power superior to conventional MPI engines, the GDI engine has a high compression ratio and a highly efficient air intake system, which result in improved volumetric efficiency.

Improved Volumetric Efficiency
Compared to conventional engines, the Mitsubishi GDI engine provides better volumetric efficiency. The upright straight intake ports enable smoother air intake. And the vaporization of fuel, which occurs in the cylinder at a late stage of the compression stroke, cools the air for better volumetric efficiency.

Increased Compression Ratio
The cooling of air inside the cylinder by the vaporization of fuel has another benefit, to minimize engine knocking. This allows a high compression ratio of 12, and thus improved combustion efficiency.

(2) Achievement
Engine performance
Compared to conventional MPI engines of a comparable size, the GDI engine provides approximately 10% greater output and torque at all speeds.

Vehicle Acceleration
In high-output mode, the GDI engine provides outstanding acceleration.
The following chart compares the performance of the GDI engine with a conventional MPI engine.