Determination of Combustion Process Model Parameters in Diesel Engine with Variable Compression Ratio

Figure 1

Classification of the various VCR mechanisms (an evaluation matrix). (a) VCR mechanism that adjust the clearance volume without modifying the (TDC) position: (1; E)–secondary piston for adjust the clearance volume; (4; A)–cylinder moves up by rotation; (10)–cylinder moves up by translation; (b) VCR mechanism that adjust the clearance volume by modifying the (TDC) position: (2, 6, 7; D)–linkage; adjust base pivot or link length; (3; F)–rocking, movement on one side generates opposite movement in piston; (B)–elastic components compress at higher pressures thus reducing clearance volume and reducing compression ratio at higher loads; (8, 9; C)–eccentric pivots; effectively adjusts link lengths.