Ford Motor Company Limited

Benny Vann

Michael John Cullen

Jeffry Allen Greenberg

John Frederick Armitage

A mass airflow based control system for an internal combustion engine is provided which is capable of inferring barometric pressure surrounding the engine. The control system determines the air charge going into the engine from a measured value of mass airflow, and compares this value with a predicted value of air charge going into the engine, which the control system infers. Differences between the two values are first attributed to inlet air temperature, which is measured, and then to a change in barometric pressure, which is the inferred barometric pressure.

Method and apparatus for inferring barometric pressure surrounding an

A mass airflow based control system is provided for an internal combustion engine including a throttle body and an air bypass valve. The system comprises a processor for determining a first value equal to predicted air charge inducted into the engine through the throttle valve, and includes memory for storing an initial value of a ratio of predicted current air charge inducted into the engine to predicted peak air charge capable of being inducted into the engine. The processor determines a second value equal to predicted air charge inducted into the engine through the air bypass valve based on the initial value, and determines a third value equal to predicted peak air charge capable of being inducted into the engine. The processor further determines an actual value of the ratio of predicted current air charge inducted into the engine to predicted peak air charge capable of being inducted into the engine based on the first, second and third values.

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Detroit, MI, United States of America

Benny Vann