Using this technique can be more flexible control of air-fuel mixture in the combustion chamber, while taking into account the different conditions of the engine efficiency, fuel saving every drop. More importantly, it can reduce emissions to meet increasingly stringent emissions regulations.
1. What is dual injection technology
direct injection engine becoming standard on new engines, some brands were also launched its own direct-injection engine.
The main feature of the direct injection engine is a “low power consumption strong” because it is “mixed combustion of oil and gas well.”
There is a very important concept – lean burn.
The most important feature is the lean-burn combustion efficiency, economy, environmental protection, but also can enhance the power output of the engine.
Because combustion at lean conditions, under difficult conditions by the theoretical air fuel ratio than the air-fuel mixture ignition, deflagration will occur less readily, so that a higher compression ratio is designed to increase the energy conversion efficiency.
can be coupled with the combustion gas in an excess of air, so that the support of these conditions can extract all of the energy of each drop of gasoline.
in the combustion engine cylinderThe air and fuel, which is referred to as air-fuel ratio of the mass.
At the time just complete combustion of gasoline, which air-fuel ratio of 14.7: 1, this value is referred to the theoretical air-fuel ratio.
lean combustion, by definition, that is to say when the fuel in the combustion air is very thin.
In the air-fuel ratio greater than 18: 1 lean combustion, the combustion state can be referred to in the cylinder.
2. dual injection technique principle
bis injection system is based on the direct injection in the intake manifold of the conventional low-pressure side increases and multi-point injection system.
Depending on the fuel system of the engine operating condition, take the appropriate injection mode.