Compression-ignition engine

Abstract

Abstract PURPOSE:To variably arrange compression ratio at starting and warming end and improve startability, fuel consumption and exhaust characteristic of an engine, by providing an intake shut off valve in an intake passage and a closing valve and a starting passage communicated to a combustion chamber in a bypass passage of the intake shut off valve. CONSTITUTION:An intake shut off valve 11 closes an intake passage 8 on the half way of an intake stroke. While a passage 14 is formed so as to be communicated to a combustion chamber 3 by bypassing the valve 11, here a closing valve 15 is provided in the passage 14 and mechanically interlocked to a throttle valve 9 to start opening together with the valve 9 after the valve 9 is opened to a prescribed opening. Now the valve 15 is closed, if an intake valve 5 is opened to start an intake stroke as a piston 1 lowers, the passage 8 is closed by the valve 11 on the half way of the intake stroke and the piston 1 continuously lowers to reach the bottom dead center again rises to enter a compression stroke. From a point of time the valve 11 closes the passage 8, intake air is not sucked into a cylinder 2. Accordingly, if the valve 15 is closed, low compression ratio is obtained, while if the valve 15 is fully opened, high compression ratio is obtained, thus the compression ratio can be easily changed.

Inventors

• 👤 Shuichi Kitamura
• 👤 修一 北村

Bibliographic Details