Engine Management & Data Acquisition Systems PDF
Preview Engine Management & Data Acquisition Systems
Engine Management & Data Acquisition Systems Formula SAE Seminar May 2004 Detroit Engine Management Systems Basics Spark – Air - Fuel 4 stroke cycle • Intake • Compression • Power • Exhaust • Requires 2 crankshaft revolutions for 1 cycle 720 degrees Intake Phase • Dependant on camshaft duration • Typically starts before piston reaches TDC on Exhaust stroke • Typically ends well after BDC on Compression stroke • Represents the 1st half of the cycle Compression Phase • Begins when Intake Valve closes • Typically begins about 40 degrees after BDC • Ends at TDC • Represents the 1st half of the cycle Power Phase • Length depends on Exhaust valve opening • Begins at TDC • Ends typically 50 – 60 before BDC • Represents the 2nd half of the cycle Exhaust Phase • Begins on Power Stroke • Typically starts about 50 – 60 before BDC • Ends usually 0 – 30 ATDC Intake Stroke • Represents the 2nd half of the cycle Overlap Phase • Takes place as Exhaust Stroke changes to Intake Stroke • Duration depends on Cam Lobe Separation Angle and Intake and exhaust valve duration • Can have a negative or positive effect depending on operating conditions Characterizing Fuel Injection • We want to add fuel to the air in the right proportion • We will be matching air mass to fuel mass on each cycle • We need to know – Air Mass per Cycle Sensing the Engine
Description:The list of books you might like
