| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent accumulation of contaminants on a detection element and reverse-flow action by providing an auxiliary passage for diverting a partial air from a main air flow and a proper opening at a housing structure. SOLUTION: A housing structure 1 for mass air flow sensor is provided with an auxiliary passage 7 inside the structure 1 for diverting partly a main air flow toward a detection element 9. The detection element 9 is shielded from the main air flow and hence a contaminant is separated from the diverted air at the diversion part, and continues its flow toward the downstream within the main air flow. The diverted air where the contaminant is eliminated passes over the detection elements 9, passes through two outflow openings 12 and 14 arranged at the rear part of the structure 1, and then flows out of the housing structure 1. The housing structure 1 can eliminate the action of reverse flow over the detection element 9 by arranging the detection element 9 itself away from the main air flow, and arranging the outflow openings 12 and 14 for the diverted air at the rear of a shielding wall.</p> |
