Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2005-03-08
2005-03-08
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
06862930
ABSTRACT:
In a thermal-type air flow measuring apparatus, a heater is set to a reference temperature which is a predetermined temperature higher than an intake air temperature detector. A flow amount detector is disposed at an upstream side of the heater with respect to a forward direction of an intake air flow. The heater is turned at a plurality of points in a direction perpendicular to the forward direction of the intake air flow and has a predetermined width in the intake air flow direction so that heat transfers less in the intake air flow direction in the heater. If the intake air flow direction reverses, the temperature distribution in the heater also reverses. As a result, an intake air amount varying in response to the air flow direction is detected by comparing the temperature of the flow amount detector with the reference temperature.
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U.S. patent appln. No. 09/994,051, filed Nov. 27, 2001 (copy of published application attached).
Ban Takao
Kohno Yasushi
Denso Corporation
Nixon & Vanderhye PC
Patel Harshad
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