US 11,692,499 B2
Intake and exhaust system
Tomonori Kashiwadate, Tokyo (JP); Susumu Shimura, Tokyo (JP); Seita Nakano, Tokyo (JP); Sotaro Yoshii, Tokyo (JP); and Kenta Hoshi, Tokyo (JP)
Assigned to SUBARU CORPORATION, Tokyo (JP)
Filed by SUBARU CORPORATION, Tokyo (JP)
Filed on Sep. 22, 2022, as Appl. No. 17/950,658.
Claims priority of application No. 2021-162525 (JP), filed on Oct. 1, 2021.
Prior Publication US 2023/0103749 A1, Apr. 6, 2023
Int. Cl. F02D 41/00 (2006.01); F02D 41/24 (2006.01); F02M 26/22 (2016.01)
CPC F02D 41/0077 (2013.01) [F02D 41/0065 (2013.01); F02D 41/2451 (2013.01); F02M 26/22 (2016.02)] 12 Claims
OG exemplary drawing
 
1. An intake and exhaust system comprising:
an engine;
an intake air channel coupled to the engine;
an exhaust gas channel coupled to the engine;
an exhaust gas recirculation channel coupling the exhaust gas channel and the intake air channel to each other;
an exhaust gas recirculation valve disposed in the exhaust gas recirculation channel; and
a control device configured to execute exhaust gas recirculation control processing by adjusting an opening degree of the exhaust gas recirculation valve, the exhaust gas recirculation control processing being processing to control a flowrate of an exhaust gas which is to recirculate back to the intake air channel from the exhaust gas channel via the exhaust gas recirculation channel,
wherein at least one isolation valve is disposed in the exhaust gas recirculation channel at a position closer to the exhaust gas channel than the exhaust gas recirculation valve is,
wherein at least one air admittance valve disposed in the exhaust gas recirculation channel at a position closer to the exhaust gas channel than the exhaust gas recirculation valve is and closer to the intake air channel than the at least one isolation valve is,
wherein the control device is configured to execute learning processing to learn a relationship between an actual flowrate and a reference flowrate, the actual flowrate being a flowrate of air which is to actually pass through the exhaust gas recirculation valve in a state in which the at least one isolation valve is closed and the at least one air admittance valve is opened, the reference flowrate being a reference value of a flowrate of air which is to pass through the exhaust gas recirculation valve in the state, and
wherein the control device is configured to execute the exhaust gas recirculation control processing based on a result of the learning processing.