Measuring and testing – Volume or rate of flow – Thermal type
Patent
1984-08-24
1986-04-01
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
123491, 73118, G01F 168
Patent
active
045789967
ABSTRACT:
A gas-flow measuring apparatus and method providing an accurate measurement of the gas-flow in, for example, an internal combustion engine. The quantity of the gas-flow is measured with a measuring device including a heater mounted in the gas-flow, and a temperature-responsive element mounted in proximity to the heater. The temperature-responsive element is heated by the heater and cooled by the gas-flow and thus, has a temperature which varies in accordance with the quantity of gas-flow. The temperature-responsive element provides an output signal corresponding to the temperature and thus to the quantity of gas-flow. Power is provided to the heater when the engine is operating. A processing apparatus detects the start of power being provided to the heater. The processor then counts the time from when the start is detected. The processor then detects when the counted time is within a predetermined time interval when the temperature of the temperature-responsive element is effectively unrelated to the quantity of gas-flow. The processor then lowers the signal level of the output signal during that time interval to provide a corrected output signal indicative of the actual quantity of gas-flow in the engine.
REFERENCES:
patent: 4384484 (1983-05-01), Kohama et al.
patent: 4393702 (1983-07-01), Kohama et al.
patent: 4399697 (1983-08-01), Kohama et al.
patent: 4413514 (1983-11-01), Bowman
patent: 4450719 (1984-05-01), Nishimura et al.
Abe Tomoaki
Suzuki Atsushi
Goldstein Herbert
Nippondenso Co. Ltd.
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