Two basic systems

When this technique is applied GDI will have two basic systems, W221 air suspension spring which are HPDI and LPDI. HPDI system relies on high pressure (100 bar or 100 atmospheric pressure) to force fuel into the combustion chamber has been filled with air. Renault's IDE engine, Siemens uses a fuel pump to produce a three-piston high-pressure fuel injection needed. At the same time, due to the electromagnetic control valve, so that the engine control system can be determined according to the engine operating into, the exhaust valve timing of the time.

Orbital's low-pressure direct injection system (LPDI) Is the two-stroke engines used in automobile manufacturing techniques further refined and improved. With LPDI system, a certain amount of fuel is injected into the oil and gas mixture is located in the gas chamber at the top of the injection means. A cam drive belt or an air compressor used to provide a pressure of about 6.5 bar to the air injection device. When the coil air injection device is started, the air pressure will cause the fuel and air into the combustion chamber. The key to this system is to play a role into the combustion chamber fuel flow should be presented flammable state. Honda Civic FG1 Coilover The system is a very important feature is not in the fuel under very high pressure, so there is no need to use a special fuel pump, fuel supply means cracking and leakage risk is also much smaller.

HPDI and LPDI these two systems are facing challenges. First, the fuel injection mode must be very precise in order to be able to fashion a layer of fuel allocated correctly. In HPDI system, which means that higher injection pressures and faster injection speeds. Siemens claims that it is currently studying up to 200 bar pressure fuel injection system, the system has a high-precision injection device capable of firing in a half millisecond.

To obtain satisfactory stratified fuel-air mixture and shape of the piston means at the top of the combustion chamber are very critical. This requires the use of computer modeling and extensive testing of each engine to determine its final shape. That is to say GDI technology does not simply tied to the existing engine. Cylinders and pistons need to be changed, a hardware electronic engine control system also needs to be improved.

And compared to conventional engine fuel pump, HPDI system for the fuel pump has a big difference. Traditional electric fuel pump allows the fuel to flow through the pump required to maintain cooling and lubrication. On the other hand, high-pressure fuel pump HPDI system has adopted to isolate the fuel flow hydraulic pump components. To reduce the possibility of leakage occurs when operating at such a high pressure, it will segregate these two parts is necessary. PSA Peugeot / Citroen and Siemens have formed a joint venture to specialize in the production of this new fuel pump for the European market.

Let the engine combustion is very lean fuel mixture means that the amount of gas in each combustion stroke their burning less fuel, and therefore the power generated will be smaller. Mitsubishi GDI engine by using a dual-mode combustion system break this limitation. Under normal circumstances for low-load driving conditions, such as urban areas, the delay in the compression stroke fuel injection, which is the same as diesel engines. This provides a very lean fuel-air mixture stratification, thereby improving the fuel economy of the engine. When the engine from different information sensor to detect when the driver desires a high load or operated car at high speed, it will advance the ejection pulse is injected in the intake stroke.

This technique allows the use of a normal air-fuel ratio of the engine. Honda Civic FG2 Coilover The key is the electronic system of the engine is capable of real-time determination of fuel should be in when and how jet.