Air flow measuring device
AssigneeDenso Corporation
InventorsYasushi Kohno, Takao Ban
Life of this patent
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Abstract
A thermal-type air flow measuring device includes a heat generation heater and a sensor circuit. The heat generation heater is configured to heat a part of intake air drawn into an engine by heat generation upon energization of the heat generation heater. The sensor circuit is configured to at least control the energization of the heat generation heater and to make temperature of the heat generation heater higher than temperature of the heat generation heater at time of the measurement of the flow rate of air when an external signal is inputted into the sensor circuit from outside of the device.
Claims11
A thermal thermal-type air flow measuring device for measuring a flow rate of air, the device comprising:
- a heat generation heater that is configured to heat a part of intake air drawn into an engine by heat generation upon energization of the heat generation heater;
- a sensor circuit that is configured to at least control the energization of the heat generation heater and to make temperature of the heat generation heater higher than temperature of the heat generation heater at time of the measurement of the flow rate of air when an external signal is inputted into the sensor circuit from outside of the device;
- and
- an intake air temperature detection resistor that is configured to detect temperature of intake air which is not heated by the heat generation heater, wherein the sensor circuit increases the temperature of the heat generation heater based on the temperature of intake air detected by the intake air temperature detection resistor.
Dependencies are inferred from the claim text.