| 摘要 |
The current flowing through a thermosensitive element is amplified and output as a signal indicating its magnitude. The signal is processed by being converted into a digital signal and is used to calculate, for example, the quantity of fuel that should be supplied for the thus measured quantity of intake air in an internal-combustion engine. The current is supplied to the thermosensitive element from the positive electrode of a power source, and returns to the negative electrode thereof via a return line. The return line and a ground potential line of the amplifier are separate lines. The magnitude of the current flowing through the thermosensitive element is varied by varying the potential of a point on the return line accordingly. Because the return line and the ground potential line are separate, the ground potential can be kept constantly stable.
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