| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary air supply apparatus for an internal combustion engine that can satisfactorily suppress discomfort caused by the operation noise of an air switching valve while suppressing the lowering of a battery voltage caused by a rush current of an air pump. <P>SOLUTION: In the internal combustion engine that includes a first secondary air supply unit having a first air pump 8 and a first air switching valve 9 and a second secondary air supply unit having a second air pump 11 and a second air switching valve 12, a time difference is provided between the operation start timing of the first air pump 8 and the operation start timing of the second air pump 11, and the open timing of the first air switching valve 9 and the open timing of the second air switching valve 12 are set so as to be simultaneous with each other. <P>COPYRIGHT: (C)2013,JPO&INPIT |
