Sensor unit and intake system of internal combustion engine

Abstract

A sensor unit is arranged in an intake pipe of an internal combustion engine. The sensor unit includes: a pressure sensor, detecting a pressure of intake air in the intake pipe; and a case, including a first accommodation part and a communication path, the first accommodation part accommodating the pressure sensor, the communication path providing communication between a pressure receiving chamber of the pressure sensor and an intake passage of the intake pipe. The communication path includes a first communication path and a second communication path, the first communication path having a predetermined passage length, the second communication path having the same passage length as the first communication path and including a region having passage area smaller than passage area of the first communication path.

Dependencies are inferred from the claim text.