CPC F01N 3/225 (2013.01) [F02B 37/183 (2013.01); F02D 41/0007 (2013.01); F02D 41/029 (2013.01); F02D 41/1406 (2013.01); F02D 41/1448 (2013.01); F01N 3/30 (2013.01); F01N 2550/14 (2013.01); F02D 2041/1433 (2013.01); F02D 2200/0406 (2013.01); F02D 2200/0414 (2013.01); F02D 2200/0802 (2013.01); F02D 2200/101 (2013.01); F02D 2200/703 (2013.01)] | 20 Claims |
12. A vehicle comprising:
a combustion engine with an intake manifold and an exhaust manifold;
a compressor configured to compress intake air upstream of the intake manifold;
an environmental catalyst device (ECD) downstream of the exhaust manifold configured to reduce one or more pollutants in exhaust air exiting the combustion engine;
a secondary air passage having a secondary air injection (SAI) valve, the secondary air passage and SAI valve controllably allowing compressed air from a first location downstream of the compressor and upstream of the intake manifold to be passed to a second location downstream of the exhaust manifold and upstream of the ECD, the SAI valve being controlled with an SAI control signal; and
a controller configured to perform a method comprising:
calculating a first pressure and a first temperature at the first location using one or more flow models and at least a sensed intake manifold pressure and a sensed intake manifold temperature;
calculating an exhaust manifold pressure; and
calculating a mass flow through the SAI valve from a model of the SAI valve using the first pressure, the first temperature, the exhaust manifold pressure, and the SAI control signal as inputs to the model of the SAI valve.
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