Method for diagnosing a lambda sensor during ongoing operation
AssigneeRobert Bosch GmbH
InventorBernhard Ledermann
Life of this patent
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Abstract
A method for diagnosing a lambda sensor during ongoing operation. It includes energizing the lambda sensor using a pump current pulse additive to a pump current and a pump current counter pulse additive to the pump current and ascertaining a malfunction of the lambda sensor from voltages, which are measured at a pump cell and/or a Nernst cell of the lambda sensor during the energization by the pulses.
Claims12
A method for diagnosing a lambda sensor during ongoing operation, comprising:
- energizing the lambda sensor using a pump current pulse additive to a pump current that is applied to a pump cell and a pump current counter pulse additive to the pump current, wherein one of the pump current pulse and the pump current counter pulse is applied after another one of the pump current pulse and the pump current counter pulse;
- and
- ascertaining a malfunction of the lambda sensor from voltages which are measured at at least one of the pump cell, and a Nernst cell, of the lambda sensor, during the energizing.
A computer-readable storage medium storing a computer program for diagnosing a lambda sensor during ongoing operation, the computer program, when executed on a computer, causing the computer to perform:
- energizing the lambda sensor using a pump current pulse additive to a pump current that is applied to a pump cell and a pump current counter pulse additive to the pump current, wherein one of the pump current pulse and the pump current counter pulse is applied after another one of the pump current pulse and the pump current counter pulse;
- and
- ascertaining a malfunction of the lambda sensor from voltages which are measured at at least one of the pump cell, and a Nernst cell, of the lambda sensor, during the energizing.
A control unit, which is designed for diagnosing a lambda sensor during ongoing operation, the control unit configured to:
- energize the lambda sensor using a pump current pulse additive to a pump current that is applied to a pump cell and a pump current counter pulse additive to the pump current, wherein one of the pump current pulse and the pump current counter pulse is applied after another one of the pump current pulse and the pump current counter pulse;
- and
- ascertain a malfunction of the lambda sensor from voltages which are measured at at least one of the pump cell, and a Nernst cell, of the lambda sensor, during the energizing.
Dependencies are inferred from the claim text.