Naval Surface Warfare Center, Carderock Division, Philadelphia Purchase Branch, Code 335, Bldg. 4, Philadelphia Business Center, Philadelphia, PA 19112-5083

28 -- GOVERNOR CONTROL FOR MAIN PROPULSION DIESEL ENGINES DUE 021398 POC Mrs. B. Reppert, Contract Specialist, 215-897-7644 A governor control for Main Propulsion Diesel Engines. The application is for reciporcating Isotta Fraschini 6 cylinder, 600 horsepower diesel engines with a Woodwrd EGB-2P forward acting governor actuator. One control per propulsion engine is required, allowing autonomous operation, if necessary. The engine speed/load control must have soft loading/unloading and closed loop load sharing capabilities, and utilize a master/slave speed reference scheme. Major functions required: -Ability to control engine speed range of 800 -- 1800 rpm. -Engine mapped variable dynamics, in which th edynamics can be varied as functions of speed, load, speed error, and when clutched in. -- Dual magnetic pickup input in the 320 Hz -- 800 Hz frequency range for normal and redundant speed signal input operation. -- Isochronous mechanical load sharing based on rack position feedback from a Woodward rotary variable differential transformer (RVDT) with actuator demand as automatic backup, should RVDT input fail. -- Speed reference during load sharing determined by the first unit clutched in by a configurable 0-5 Vdc or 1-5 Vdc remote speed setting input or local Raise/Lower discrete contact inputs. -- Clutch sequencing to allow first unit asked to clutch in to ramp to idle an dissue a signal for the clutch to engage. With one unit one line, th eoncoming unit asked to clutch in will match speed with the master and issue a signal for the clutch to engage. -- Soft loading and unloading in which the oncoming unit will ramp its load to match the masters and perform isochronous load sharing. In the de-clutching sequence, the unit will ramp its load to the unload trip level and issue a de-clutch signal. The first unit on-line is designated as the master and the system will run at the masters speed reference, any changes to the slave speed reference are ignored. -- One analog remote speed setting in put to the control (configurable 1-5 or 1 -- 5 Vdc) is required, with additional local discrete contact raise and lower speed inputs and independently adjustable speed ramp rates. -- Engine protection via torque (fuel) limiting is required and is to be based on percent fuel rack position versus engine speed. Aa discrete input must be available to disable this feature in battle conditions. -- A 4 to 20 mA fuel rack position input signal to the control must be available for load sharing, indication, and limiting for accurate control. -- Start fuel limitig FEATURE is required to protect the engine and reduce smoke. -- Maximum fuel limiting is required as an electronic fuel rack stop. -- As a minimum, two configurable relay outputs must be available for alarm condition indications such as overspeed indication, fuel rack position indication failure, fuel limiter in control, speed switch, and remote speed command input failure. -- Three configurable analog outputs must be available for engine speed (tachometer) indication, speed reference, remote speed reference, % load, actuator signal, and fuel demand. Required inputs to the control/outputs from the control to other systems: -- 24 Vdc input power with internal ground isolation, nominal power 40 watts. -- Two magnetic pickup unit inputs (320 Hz -- 720 Hz representing 800 to 1800 rpm) for redundant engine speed sensing. -- A a minimum, five discrete inputs requiring approx. 10 mA at 24 Vdc for "close for shutdown" indication, "Close when clutch is engaged" indiation, local raise speed, loacl lower speed, and fuel limiter override. -- At a minimum, three discrete outputs for minor and major alarm indications, and engage clutch or clutch permissive signal. -- At a minimum, three analog inputs for fuel rack position sensing (4-20 mA), remote speed setting (0-5/1-5 Vdc), and manifold air pressure (4-20 mA). -- Actuator output (20-160 mA, forward acting). Must meet the following MIL-SPEC requirements: -- MIL-SPEC 901D -- MIL-STD 167-1 Type 1 -- MIL-STD 461D (CE101, RE101, RE102, CS101, CS116, RS101) Dueto limited real estate onboard MCM-1 class ships, each unit (4 units per ship) must be no larger than 18"X12"X3". 50 Total units required no later than 30 September 1998. (0035)

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