Patent ID: 7936566

Claim:
An electronic control unit comprising: a waterproof case; a printed-circuit board housed in said waterproof case, said circuit board having electronic components mounted thereon; and a respiratory filter arranged on said waterproof case for allowing air to flow into and out of the waterproof case; wherein the waterproof case includes a cover comprising cover walls that are of a uniform thickness; said cover walls include a raised portion with a depression formed therein; said depression is laterally delimited by protective walls that extend upward from a base of said depression, and are formed by a portion of the cover walls in the raised portion; said depression has a polygonal shape defined by said protective walls, and surrounds a portion of the case at which the respiratory filter is arranged; channels extend through said raised portion in a radial direction from each respective corner of the polygonal shape; and the respiratory filter is fixable in said depression, in an airtight manner via an O-ring, within a ventilation hole formed so that the hole penetrates through the cover, and an upper extent of each of the protective wall is higher than an upper side of the O-ring.