Gm Global Technolgoy Operations, Inc.

Martin Leven

Layne K Wiggins

Wajdi B Hamama

Kauser Ferdous

William J Morgan

Robert Domino

A system for a vehicle includes a humidity determination module, a specific humidity module, and a parameter control module. The humidity determination module determines a first specific humidity of air based on a relative humidity of the air measured by a humidity sensor in an intake system of the vehicle. The specific humidity module sets a second specific humidity of the air equal to one of the first specific humidity and a predetermined specific humidity of the air in response to a comparison of a mass air flowrate (MAF) into an engine and a predetermined flowrate. The parameter control module controls at least one operating parameter of an engine based on the second specific humidity.

Engine control systems and methods with humidity sensors

An improved assembly method and a corresponding diagnostic method carried out by an electronic engine control module in a factory test setting reliably and inexpensively verifies correct matching of a vehicle engine and an exhaust gas oxygen sensor installed on an exhaust pipe thereof. Heating elements within the oxygen sensors are manufactured so as to exhibit an electrical resistance that is different for each type of sensor. Due to normal part-to-part tolerance variation, the heater resistance of one type of oxygen sensor falls into a first range, and the heater resistance of the other type of oxygen sensor falls into a second range. The electronic control module for each engine is calibrated as part of its overall fuel control calibration, to recognize an oxygen sensor current requirement range corresponding to the respective fuel control (i.e., leaded or unleaded). The electronic control module operates during an initial period of engine operation during factory testing prior to convergence of the first and second resistance ranges to measure the average current supplied to the installed oxygen sensor, and to compare the measured current with the calibrated current requirement range. The comparison is used to set a diagnostic indicator, which is checked to determine if the engine should be directed to the next assembly area or returned to a repair area so that the correct sensor may be installed.

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West Bloomfield, MI, United States of America

Martin Leven