HOT WIRE TYPE AIR FLOWMETER

摘要

PURPOSE:To reduce ventilation resistances in a hot wire air flowmeter and to obtain a stable output by reducing the disturbance of the hot wire air flowmeter which measures the sucking amount of air of an internal combustion engine. CONSTITUTION:A body 1 constituting an air passage has a main air passage 5 and a bypass passage 6. A heat generating resistance 2 and a temperature sensitive resistance body 3 are provided in the bypass passage 6. The heat generating resistance body 2 and temperature sensitive resistance body 3 are driven by a module 4. A rib 8 for rectifying the air flow is disposed in the lower part of the bypass passage 6. Because of the rectifying rib 8, the disturbance of the air flow generated in the lower part of the bypass passage 6 is prevented, thereby reducing the ventilation resistances of the flowmeter. Moreover, the vibration of outputs of the flowmeter is also prevented, thus making it possible to obtain a stable output.