Solenoid valve controlled injection pump using electronic control (VP44)

Electronic control using Common-rail diesel injection systems

The common rail system derives its name from the fact that a common rail, or fuel reservoir, is used to supply fuel to all the fuel injectors. This technology is similar to what EFI petrol��s have been using for many years. Instead of an in-line or distributor fuel pump, which distributes the fuel directly to each injector, a high-pressure pump is used, which generates a very high fuel pressure (up to 2000 bar on some systems) in the accumulator rail. The accumulator rail stores fuel, and maintains a constant fuel pressure (via a fuel pump), with the aid of a pressure control valve. Each injector is supplied with high-pressure fuel from the accumulator rail, and the injectors are individually controlled via signals from the systems electronic control unit. The injectors are electromagnetically operated.

The components can be divided into three sub-systems: the low-pressure fuel system, the high- pressure fuel system and the electronic control system.

Low-pressure fuel system:

Fuel tank, Fuel lift pump, Fuel filter/water trap, Low-pressure fuel lines, Fuel cooler.

The low-pressure system (fuel supply system) is responsible for supplying clean fuel to the high-pressure fuel circuit.