US 11,994,055 B2
Flow estimation for secondary air system
Paul Dickinson, Bristol (GB); Ondrej Santin, Plesí (CZ); and Malay C. Maniar, Boeblingen (DE)
Assigned to Garrett Transportation I Inc., Torrance, CA (US)
Filed by Garrett Transportation I Inc., Torrance, CA (US)
Filed on May 23, 2023, as Appl. No. 18/322,411.
Application 18/322,411 is a continuation of application No. 17/869,633, filed on Jul. 20, 2022, granted, now 11,698,014.
Prior Publication US 2024/0026809 A1, Jan. 25, 2024
Int. Cl. F01N 3/22 (2006.01); F02B 37/18 (2006.01); F02D 41/00 (2006.01); F02D 41/02 (2006.01); F02D 41/14 (2006.01); F01N 3/30 (2006.01)
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
OG exemplary drawing
 
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.