| 摘要 |
A method and system for controlling exhaust emissions from an engine of a motor vehicle includes sensing oxygen levels upstream and downstream of a catalytic converter, predicting an instantaneous oxygen storage amount in the catalytic converter, determining a maximum oxygen storage capacity, selecting a target percentage of the maximum oxygen storage amount, and controlling the motor vehicle engine performance to a state where the oxygen storage amount is approximately the target percentage of the maximum oxygen storage amount. The instantaneous oxygen storage amount is determined from an oxygen storage mass flow rate, which is determined from a converter-in mass flow rate, converter-out mass flow rate, and a predicted oxygen consumption mass flow rate. The converter-in and converter-out mass flow rates are calculated from an upstream and downstream oxygen mass fraction, respectively, based on the sensed upstream and downstream oxygen levels, respectively.
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