3.8.1. Injection pump The in-line injection pump is driven via gears from the crankshaft. It is connected to the force feed lubricating system of the engine and consequently maintenance-free. The governor flange-mounted on the pump casing is a variable range governor designed to keep the speed set by the speed control unit constant under conditions of varying load. Governor system for fuel injection pump consists of “Integral Actuator” and “ Speed Control Unit”. 1) Integral Actuator 2) Speed control unit for governor system The ESD5550 Series speed control unit is an all electronic device designed to control engine speed with fast and precise response to transient load changes.
This closed loop control, when connected to a proportional electric actuator and supplied with a magnetic speed sensor signal, will control a wide variety of engines in an isochronous or droop mode. It is designed for high reliability and built ruggedly to withstand the engine environment. Simplicity of installation and adjustment was foremost in the design. Non-interacting performance controls allow near optimum response to be easily obtained. The primary features of the ESD5550 Series speed control unit are the engine STARTING FUEL and SPEED RAMPING adjustments. The use of these features will minimize engine exhaust smoke experienced prior to attaining engine operating speed.
Other features include adjustable droop and idle operation, inputs for accessories used in multi- engine or special applications, protection against reverse battery voltage, transient voltages, accidental short circuit of the actuator and fail safe design in the event of loss of speed sensor signal or battery supply. - 17 - Engine model P126TI GAC governor model ACE 175A Speed control unit model ESD5550