EPC1M

Ever more demanding emission regulations valid for presently manufactured diesel engines have led to requirements for fundamental innovations of the units transporting the fuel in the operating space of the engine. While the requirement for high injection pressure may be met by means of a mechanical pump with modifi ed standard design, the requirement for variable starting point related to the conditions of the motor at any given time may be fulfi lled only by means of electronically controlled regulating devices. The starting point of the fuel supply and the supply itself is given from a control program, whose memory consists of a huge fi eld of values that are optimized for individual operating conditions. The control unit may (in addition to the basic function) be used as a safety and diagnostic unit as well.

EPC1M single-cylinder injection pumps are just one of various types of injection systems.

The EPC1M injection pumps are pumps without their own drive mechanism. They are designed in such a way that their dimensions are compatible with the dimensions of (today widely used) injection pumps of size Q. Besides new applications, it is possible to use these units for the modernisation of older engines with injection pumps of size Q, with no need for fundamental changes to the engine body and drive mechanism. The injection pumps are equipped with a control valve that is controlled by an electromagnet. The very moment and the electromagnet switching period then determine the beginning of the injection process and the volume supplied. The electromagnet is controlled by an electronic control unit (ECU). The unit is usually located near the engine, on the chassis; it is connected to the pump by means of a cable bunch. The PC1M pumps may be used on engines up to 20 kW per cylinder.

The drive of the injection pump must consist of a camshaft with a suitable cam for the given pump. The camshaft is integrated into the engine. The transfer of the motion of the cam to the piston of the injection pump is provided via a jack with a pulley, supplied as accessories to the injection pump.

The EPC1M pump is one of various versions of single-cylinder pumps. Other variants may be derived on request, depending on engine dimensions. For example, the pumps may be of so-called sunk-in type with their own jack – EPR1M.