High Pressure Common Rail (HPCR) fuel system

High-Pressure Common Rail Fuel Flow system | Doosanequipment EMEA

A highly efficient fuel injection system is essential for the clean operation of a diesel engine. HPCR is an advanced fuel injection design that better regulates fuel pressure and injection timing. It is already used extensively on Doosan’s high output engines and its Engine Control Unit (ECU) technology is instrumental in meeting Stage IIIB and Stage IV demands.

It allows the application of further technologies such as Diesel Oxidation Catalyst (DOC), Selective Catalytic Reduction (SCR) and Diesel Particulate Filter (DPF) systems, which are described below.


How does HPCR work?

Fuel Pressure

  • The high pressure pump applies high pressure to the fuel (1600 – 2400 bar).
  • The Common Rail stores pressurized fuel.
  • The injectors deliver fuel to the engine.


Injection Timing

The ECU precisely controls the injectors to allow multiple fuel injections during each combustion cycle.


The benefit of better combustion

High pressure transforms the fuel into an extremely fine mist as it leaves the injectors. In this form it combusts more thoroughly, leading to :

  • Lower costs – As the fuel burns more completely, the engine needs less of it to run.
  • Cleaner exhaust – Less unburned fuel is left behind in the exhaust.
  • Better performance – Multiple injections during each combustion cycle means that combustion lasts longer, creating more energy and more output from the engine.
  • Increased comfort – Longer-lasting combustion lowers peak engine cylinder pressure. This reduces engine noise levels, making operation more comfortable.