To minimize expense and cost by avoiding defects in the conventional technique and enhancing certainty of a function in operating a negative pressure storage device.
A dominant pressure in a negative pressure storage device 6 is checked by calculation. Here, a flow amount is supplied to the negative pressure storage device 6 when at least one of servo functions 8, 10, 11 responds, a flow amount is discharged from the negative pressure storage device 6, when a dominant pressure in an intake pipe 1 is smaller than the dominant pressure in the negative pressure storage device 6, and the dominant pressure in the negative pressure storage device 6 is calculated from the balance of income/ outgo flow amounts supplied/discharged to/from the negative pressure storage device 6.
WAGNER WOLFGANG
MELCHIOR GERARD
RIES-MUELLER KLAUS
KUESELL MATTHAIS DR
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