Oxygen sensor heater service bay test
AssigneeGeneral Motors Corporation
InventorsMark D. Carr, Daniel P. Grenn, Jerry L. Brink
Life of this patent
Estimating the term…
Abstract
A diagnostic routine is used for testing an oxygen sensor heater of an internal combustion engine. The oxygen sensor heater is preheated prior to testing. A voltage signal from the oxygen sensor is measured after a predetermined period of time. If the voltage signal is greater than a threshold value after the predetermined period of time has elapsed, the oxygen sensor heater is considered to have failed the diagnostic routine. If the voltage signal is not greater than the threshold value after the predetermined period of time has elapsed, the oxygen sensor is considered to have passed the diagnostic routine.
Claims16
A diagnostic routine for testing a heater for an oxygen sensor of an internal combustion engine comprising the steps of:
- preheating the oxygen sensor heater;
- disabling a fuel injection system of the internal combustion engine;
- cranking the internal combustion engine;
- measuring a voltage signal from the oxygen sensor after a predetermined period of time;
- determining if the voltage signal is greater than a threshold value after the predetermined period of time has elapsed;
- if the voltage signal is greater than the threshold value, signaling the oxygen sensor heater failed the diagnostic routine;
- and
- if the voltage signal is not greater than the threshold value, signaling the oxygen sensor heater passed the diagnostic routine.
A diagnostic routine for testing a heater for an oxygen sensor of an internal combustion engine comprising the steps of:
- preheating the oxygen sensor heater;
- disabling a fuel injection system of the internal combustion engine;
- cranking the internal combustion engine after the fuel injection system is disabled;
- measuring a voltage signal from the oxygen sensor after cranking the internal combustion engine;
- determining if the voltage signal is greater than a threshold value;
- if the voltage signal is greater than the threshold value, aborting the diagnostic routine;
- and
- if the voltage signal is not greater than the threshold value, continuing with the diagnostic routine.
A diagnostic routine for testing a heater for an oxygen sensor of an internal combustion engine comprising:
- means for preheating the oxygen sensor heater;
- means for disabling a fuel injection system of the internal combustion engine;
- means for cranking the internal combustion engine;
- means for measuring a voltage signal from the oxygen sensor after a predetermined period of time;
- means for determining if the voltage signal is greater than a threshold value after the predetermined period of time has elapsed;
- means for signaling the oxygen sensor heater failed the diagnostic routine if the voltage signal is greater than the threshold value;
- and
- means for signaling the oxygen sensor heater passed the diagnostic routine if the voltage signal is not greater than the threshold value.
A diagnostic routine for testing a heater for an oxygen sensor of an internal combustion engine comprising:
- means for preheating the oxygen sensor heater;
- means for disabling a fuel injection system of the internal combustion engine;
- means for cranking the internal combustion engine;
- means for measuring a voltage signal from the oxygen sensor after cranking the internal combustion engine;
- means for determining if the voltage signal is greater than a threshold value;
- means for aborting the diagnostic routine if the voltage signal is greater than the threshold value;
- and
- means for continuing with the diagnostic routine if the voltage signal is not greater than the threshold value.
Dependencies are inferred from the claim text.