Pressure control method for common rail of fuel-injected internal combustion engine, has comparator measuring measured and reference values for tank pressure and has valve controlling return line to tank

摘要

A low-pressure pump (110) draws fuel from the tank (100) through a first filter (105) and pushes it through a second filter (115) to a high-pressure pump (125). There is a fuel return line with a control valve (145) after the second filter. The high-pressure pump has a control circuit (180) receiving signals (AP) from a control circuit (160). The control circuit receives signals (PI) from a pressure sensor (140) on the common rail (130) for the fuel injectors (131) and sends control signals (A) to the injectors. The control circuit incorporates two comparators and can regulate fuel pressure and engine speed. An Independent claim is made for a pressure control system.