Thermal-type airflow meter, intake air system for an internal combustion engine, and control system for the same

An assembly for a thermal airflow meter, said assemble comprising:

• a sub-air passage having at least one bent portion for conveying a part of air flowing through a main air passage;
• a heating sensitive sensor arranged within the sub-air passage and coupled to an electronic circuit for producing a signal indicative of an airflow rate in said sub-air passage;
• and
• a housing accommodating therein the electronic circuit, said housing being composed of a frame part surrounding the electronic circuit, a connector part with connector terminals for electrically coupling the electronic circuit with external devices, and fixing mounts for fixedly supporting the heat sensitive sensor on a side opposite the connector part with respect to the frame part, all of which are plastic-molded as one body;
• wherein
• a sub-air passage member for forming the sub-air passage is a plastic-molded article;
• and
• at least the frame part of the housing and the sub-air passage member are formed in a flat shape and fixedly arranged on a metallic base member in a longitudinal direction thereof, so as to locate the heat sensitive sensor in the sub-air passage.

An assembly for a thermal airflow meter, said assembly comprising:

• a sub-air passage having at least one bent portion for conveying an air flow therein;
• a heat sensor arranged within the sub-air passage and coupled to an electronic circuit which generates a signal indicative of an airflow rate in said sub-air passage;
• and
• a housing comprising a frame part surrounding the electronic circuit, a connector part with connector terminals for electrically coupling the electronic circuit with external devices, and fixing mounts for fixedly supporting the heat sensor on a side opposite the connector part with respect to the frame part, all of which are plastic-molded as one body;
• wherein
• a sub-air passage member for forming the sub-air passage is a plastic-molded article;
• and
• at least the frame part of the housing and the sub-air passage member are formed in a flat shape and fixedly arranged on a metallic base member in a longitudinal direction thereof, so as to locate the heat sensor in the sub-air passage.