Chapter 1 Basic structure and principle of the engine Section 2 Basic working principle 1.Basic Terms of Internal Combustion Engine (1)upper dead point(UDP) (2)lower dead point(LDP) UDP (3)strokeS Stroke (4)fuel chamber volume Vc (5)cylinder working volume Vh V=80s×10 (L) 4 (6)total volume ofcylinder Va Va=V。+V (7)compressionratio s Figure 1.3 Internal combustion engine VV+V.=1+7 e-V.-V schematic diagram 1.intake valve 2.exhaust valve 3.cylinder (8)total swept volume of piston Vz 4.piston 5.connecting rod 6.crankshaft center Vz=Vh·i 7.crank 机被电子工程模 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 1 Basic structure and principle of the engine (1) upper dead point(UDP) (2) lower dead point(LDP) (3) stroke S (4) fuel chamber volume Vc (5) cylinder working volume Vh (6) total volume of cylinder Va (7) compression ratio ε ε (8) total swept volume of piston Vｚ Ｖｚ＝Ｖｈ·ｉ S 10 (L) 4 D V 3 2 h − =  ð Va = Vc + Vh c h c c h c a V V 1 V V V V V = + + = = 1. Basic Terms of Internal Combustion Engine Figure 1.3 Internal combustion engine schematic diagram 1. intake valve 2. exhaust valve 3. cylinder 4. piston 5.connecting rod 6. crankshaft center 7. crank Section 2 Basic working principle