METHOD FOR ESTIMATING CHARGE AIR COOLER CONDENSATION STORAGE AND/OR RELEASE WITH TWO INTAKE OXYGEN SENSORS

摘要

Methods and systems are provided for estimating water storage in a charge air cooler (CAC). In one example, engine operation may be adjusted responsive to water storage parameters at the CAC, the water storage parameters based on an output of a first oxygen sensor positioned downstream of the CAC and a second oxygen sensor positioned upstream of the CAC. Further, operation of the first oxygen sensor and the second oxygen sensor may be diagnosed during certain engine operation conditions wherein no condensate is forming in the CAC.

主权项

1. An engine method, comprising:
during engine operation when condensate less than a threshold is forming in a charge air cooler and condensate less than the threshold is leaving the charge air cooler, indicating degradation of a first oxygen sensor positioned downstream of the charge air cooler and a second oxygen sensor positioned upstream of the charge air cooler with respect to one another.