| 摘要 |
A multi-cylinder internal combustion engine having valve train operated intake and exhaust valves for each cylinder and a valve control system adding the capability of automatic selection as to whether or not given cylinders are to be in operation. The application of the system to a V-8 engine, for example, to permit selection between four cylinder operation or eight cylinder operation may be summarized as follows: The cylinders that are to be controlled are identified and movable interposers are installed for both the intake and exhaust valves of the selected cylinders. Control rods interconnect intake interposers to each other and exhaust interposers to each other. A combined actuation arm and interconnection link is provided to transfer motion from a selection actuator to the control rods. A mechanical interlock ensures that exhaust valves are not deactivatable until deactivation of the intake occurs. More specifically, the control mechanism is operatively associated with the fulcrum of the rocker arm in each of the valve trains controlling the intake and exhaust valves for the selected cylinders. Control of the operation of a given valve is accomplished by moving an interposer into a gap between a fulcrum load transfer tube and a load bearing plate. In this position the interposer prevents movement of the fulcrum and the rocker arm motion is transferred to the valve as in normal operation. With the interposer out of position, the load transfer tube is free to travel, the fulcrum will move up and down on the fulcrum support but the valve will remain stationary.
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