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US 2025/0155323 A1Published application
Air-fuel ratio calculation device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKazuki TAKAHASHI
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Abstract
An air-fuel ratio calculation device is applied to an air-fuel ratio sensor including a sensor element installed in an exhaust passage of an engine and a heater for heating the sensor element. The air-fuel ratio calculation device includes an acquisition unit, an impedance calculation unit, an electric power calculation unit, and an air-fuel ratio calculation unit.
Claims4
An air-fuel ratio calculation device applied to an air-fuel ratio sensor including a sensor element installed in an exhaust passage of an engine and a heater for heating the sensor element, the air-fuel ratio calculation device comprising:
- an acquisition unit configured to acquire an output value of the sensor element and a target air-fuel ratio of the engine;
- an impedance calculation unit configured to calculate an impedance of the sensor element;
- an electric power calculation unit configured to calculate an integrated electric power value supplied to the heater;
- and
- an air-fuel ratio calculation unit configured to calculate an air-fuel ratio based on the output value,
- wherein
- when the air-fuel ratio corresponding to the output value indicates a rich air-fuel ratio smaller than a theoretical air-fuel ratio, the air-fuel ratio calculation unit is configured to calculate the air-fuel ratio to be leaner as the target air-fuel ratio is leaner, as the impedance is higher, and as the integrated electric power value is smaller.
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Dependencies are inferred from the claim text.