| 摘要 |
<p>PURPOSE:To enable the intake pressure in each intake pipe at the time of low loads to be standardized without a sacrifice of the merit of individual intake at the time of high loads by permitting a communicating pipe communicated with each intake pipe to be changed either into a communicating state or into a non-communicating state depending on the operating conditions of an internal-combustion engine. CONSTITUTION:In an internal-combustion engine comprising a number of independent intake systems, a communicating pipe 8 is mounted for communicating intake pipes 4a-4d on the downstream side of throttle valves 5a-5d. The communicating pipe 8 is permitted to have a volume being large enough to standardize the intake pressure in each intake pipe, and also is provided with an air control valve 7 involving a valve 9 which is used for changing each of the intake pipes 4a-4d into a communicating state or a non-communicating state. The valve 9 is turned through a lever 16 by an actuator 17 controlled with an operating condition detecting means, so that two kinds of state, such as communicating state at the time of low loads, and non- communicating state at the time of high loads, can be presented depending on the locational relation between the connecting opening for the communicating pipe 8 and the ports 15a-15d for connection.</p> |
