| 摘要 |
Disclosed is a reciprocating piston internal combustion engine 10 having a combustion chamber 13, a poppet valve 14 at the inlet 15 to the combustion chamber 13, an inlet manifold 16 upstream of the valve 14 and a throttle valve 17 at the inlet to the manifold, the inlet valve comprising an active (adjustable) tappet 19. The arrangement is used to optimise idling of the engine. The engine may be a spark ignition engine and ignition timing can also be used to optimise idling of the engine. |
