Here to highlight Key programmer Renault Renault the role of the shape

Here to highlight  Key programmer Renault the role of the shape of the top of the piston cylinder flow. The piston in the upper dead point position, the gap between the head surface of the piston and the cylinder head is called the combustion chamber, the volume of the combustion chamber is an important factor to determine engine performance. GDI piston raised portion of the top surface of the piston like the roof, also known as "bending the top surface, it reduces the volume of the combustion chamber, contribute to the formation of a strong eddy. Refine the combustion chamber volume is bound to increase the compression ratio, and therefore the GDI compression ratio of 12:1, about 1/3 higher than the conventional engine. Compression ratio improved cylinder temperature must also increase as contribute to the lean-burn. Key programmer   The compression ratio, the output power increases, so also compensate the power loss of the lean burn.

        Compression ratio means that the cylinder pressure to improve, in the complex is a high pressure fuel pump, and sent to the combustion chamber with high-pressure gasoline. However, the nature of the gasoline to determine the compression ratio can only be limited within certain limits, otherwise there will deflagration, in order to avoid this phenomenon, the GDI two-step injection process, the first step in the intake stroke injection gasoline to reduce the gas temperature, to adapt to the high compression ratio; second step set forth above in the compression stroke nissan consult 3 and post-injection gasoline formed layered mixed gas form. This is inter-related technologies, complementary and indispensable.