Method for detecting the operational readiness of a jump lambda sensor
First Claim
1. A method for detecting operational readiness of a jump lambda sensor associated with an internal combustion engine, characterized in that internal resistance of the jump lambda sensor is determined as the criterion for operational readiness of the jump lambda sensor, the internal resistance being measured by applying a pulsed current to the jump lambda sensor, wherein the frequency of the pulsed current is adapted as a function of the measured internal resistance of the jump lambda sensor, and wherein the attainment of operational readiness of the jump lambda sensor is inferred when the measured internal resistance falls below a predefined threshold.
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Abstract
In a method for detecting the operational readiness of a jump lambda sensor associated with an internal combustion engine the internal resistance of the sensor is determined as the criterion for the operational readiness of the sensor. The internal resistance is measured by applying a pulsed current to the sensor, the frequency of the current being selected as a function of the state of the sensor (1, 2, 3, 4).
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18 Claims
- 1. A method for detecting operational readiness of a jump lambda sensor associated with an internal combustion engine, characterized in that internal resistance of the jump lambda sensor is determined as the criterion for operational readiness of the jump lambda sensor, the internal resistance being measured by applying a pulsed current to the jump lambda sensor, wherein the frequency of the pulsed current is adapted as a function of the measured internal resistance of the jump lambda sensor, and wherein the attainment of operational readiness of the jump lambda sensor is inferred when the measured internal resistance falls below a predefined threshold.
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15. A method for detecting operational readiness of a jump lambda sensor associated with an internal combustion engine by determining internal resistance of the jump lambda sensor as a criterion for operational readiness of the jump lambda sensor, comprising:
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measuring internal resistance by applying a pulsed current to the jump lambda sensor at a first frequency; when the measured internal resistance decreases to a measurement value indicating an imminent operational readiness for the jump lambda sensor, measuring the internal resistance by applying a pulsed current to the jump lambda sensor at a second frequency that is greater than the first frequency; when the measured internal resistance decreases to a predefined threshold indicating an attained operational readiness for the jump lambda sensor, measuring the internal resistance by applying a pulsed current to the jump lambda sensor at a third frequency that is greater than the second frequency. - View Dependent Claims (16, 17, 18)
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