| 摘要 |
The device comprises a bridge of transistors (T1, T2, T3, T4) controlled by a microprocessor ( mu P). The latter processes a measurement signal (Vs) delivered by a measurement cell (1) of the probe in order to control the direction and duration of the passage through an oxygen pump (2) of a current I of predetermined strength, brought under the control of (Vs). A periodic ajternating control, with a variable cyclic ratio, of the current sent through the probe is provided by appropriate switching of the transistors in the bridge. Application to the measurement of the air/fuel ratio in the mixture supplied to an internal combustion engine.
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