| 摘要 |
An air filter for an air intake system of a multi-cylinder internal combustion engine has a housing with a first housing part and a second housing part. A filter element is arranged between the housing parts. An untreated air side of the air filter is formed in the first housing part and a clean air side of the air filter is formed in the second housing part. The first housing part has a housing opening for conducting untreated air into the housing and the second housing part has a housing opening for discharging clean air out of the housing. Further, the housing has a third housing opening for conducting untreated air into the housing, with the housing holding a switchable flap arrangement for opening and closing the third housing opening. The flap arrangement can be activated as a function of operating states of the internal combustion engine. This allows variable, in particular large air masses to be passed through an air filter on account of the further housing opening.
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