| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gas flowmeter, having small output errors due to temperature change in a pulse output type gas flowmeter. SOLUTION: As the reference frequency of a pulse output circuit, an external oscillator frequency to be output from an engine control unit (ECU) or the like is used. Since an internal oscillator, having a large frequency change due to the temperature change, is not used as a reference, the error in the output pulse signal due to temperature change is eliminated. Although the pulse signal input from the gas flowmeter to the ECU is measured by a counter, since this counter uses the same reference frequency, the measurement stability becomes higher.</p> |
