Bosch has been manufacturing in-line fuel-injection pumps since They guarantee high cylinder performance in engines with between 2 and 12 cylinders. This slides are about inline injection pump and calibration of the working of the pump is described in simple words and with. In-line Injection Pumps An in-line injection pump fuel system layout is schematically shown in Fig. Essentially all in-line diesel injection pumps use one or.


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Diesel engines may over-rev due to excess amount of air and a governor can be used to cut the inline fuel injection pump supply till the engine speed goes below the maximum revving speed.

RSV governor is used to control the fuel quantity at varying speeds between the idling speed and the maximum speed.

Diesel Engine In-Line Injection System - MATLAB & Simulink

It has a flyweight attached to one end of the camshaft. It also has a governor spring pivoted to a tensioning lever which acts against the force of the flyweights.

When the speed of the engine is altered, the tension in the governor spring also alters accordingly such that the turning of the tensioning lever is kept in equilibrium with inline fuel injection pump opposing forces of the flyweights.

The variation in the control lever angle is transmitted to the control rack via fulcrum and guide lever linkages. This helps in varying the fuel inline fuel injection pump.

Various speeds can be achieved by varying the control rack movement: The control rack is kept in the starting position by means of a starting spring whose one end is hooked to the control inline fuel injection pump and the other end is hooked to the top end of the fulcrum lever.

This sets the fuel injection pump to the starting quantity.

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To achieve idle speed, the control lever is released and made to rest against the low idle stop screw. In this case, there is no tension on the governor spring and it sits in a vertical position.


In all types, it is of prime importance to keep the leakage between the plungers and their barrels to a minimum.

Bosch snubber valve in schematic view. In-line injection pump fuel system layout. The timing of the cut-off of the inlet port is constant, but the start of injection can be verified inline fuel injection pump incorporating a device to rotate the camshaft a few degrees relative to the drive shaft.

In-line Injection Pumps (Automobile)

inline fuel injection pump Cam shaft In-line injector pump with four pumping elements, one element per cylinder Injectors The cam shaft carries five cams. The inline fuel injection pump one is the eccentric cam to actuate the lift pump.

The remaining four are intended to drive plungers of the pump. The cams are installed in such a way that pumping elements deliver fuel in the firing order and at the correct instant in the engine's cycle of operation.

The lift pump supplies fluid to the intake of injector pump elements. Each element of the pump consists of a cam-driven plunger, delivery valve, and the governor assembly.

The purpose of the governor is to control the volume of the fuel delivered by the plunger to a cylinder. It is attained by rotating the plunger with the helical groove with respect to the inline fuel injection pump orifice.

All the system units will be described in more details in the following sections.