| 摘要 |
A wide range air to fuel (A/F) ratio sensor having a solid electrolyte plate, a measurement electrode and a first pumping electrode both formed at one surface of the solid electrolyte plate, the measurement electrode serving as both an oxygen pumping electrode and a sensing electrode, and a second pumping electrode and a sensing reference electrode both formed at another surface of the solid electrolyte plate, the sensing reference electrode being supplied with oxygen from the first pumping electrode and thereby serving as an oxygen reference electrode. The wide range A/F ratio sensor can be driven by a reference voltage variation method which adds a surplus voltage to a reference voltage.
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