Patent ID: 7178330
Filing Date: 2007-02-20
Classification: F01N,Y02T,Y10T

Abstract:
1. A secondary air pressure detecting apparatus that detects pressure of secondary air, secondary air press-fed from an air pump to an exhaust system of an internal combustion engine, the secondary air pressure detecting apparatus comprising: a solenoid valve that is arranged between the air pump and the exhaust system, the solenoid valve defining a secondary air passage that introduces secondary air from the air pump into the exhaust system, the solenoid valve capable of opening and closing the secondary air passage; and a pressure sensor that is integrally mounted to the solenoid valve to detect pressure of secondary air in the solenoid valve, wherein the solenoid valve includes a coil assembly and a plurality of magnetic members, the coil assembly includes a solenoid coil that generates magnetic force when the solenoid coil is energized, the plurality of magnetic members constructs a magnetic circuit with the solenoid coil, the magnetic circuit is arranged outside of the secondary air passage, and the magnetic circuit is located between the pressure sensor and the secondary air passage.