US 12,454,923 B2
Intake and exhaust system
Hiroki Nagashima, Tokyo (JP)
Assigned to SUBARU CORPORATION, Tokyo (JP)
Filed by SUBARU CORPORATION, Tokyo (JP)
Filed on Oct. 17, 2024, as Appl. No. 18/918,540.
Claims priority of application No. 2023-189658 (JP), filed on Nov. 6, 2023.
Prior Publication US 2025/0146450 A1, May 8, 2025
Int. Cl. F02D 41/02 (2006.01); F02D 41/00 (2006.01)
CPC F02D 41/0255 (2013.01) [F02D 41/0007 (2013.01); F02D 41/0055 (2013.01); F02D 2200/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An intake and exhaust system comprising:
an engine;
an exhaust flow passage coupled to the engine;
a catalyst disposed in the exhaust flow passage and configured to purify exhaust gas; and
a control apparatus comprising
one or more processors, and
one or more memories coupled to the one or more processors, wherein
the one or more processors are configured to
before the engine is started up, execute scavenging control that causes
the exhaust gas remaining in the engine and the exhaust flow passage to flow to pass through the catalyst before being discharged, and
identify a degree of purification of the exhaust gas by the catalyst, and
before the engine is started up, execute warming control that warms up the catalyst, based on the identified degree of purification of the exhaust gas by the catalyst during execution of the scavenging control,
the intake and exhaust system further comprising
an on-off valve disposed in the exhaust flow passage, and
a throttle valve disposed in an intake flow passage coupled to the engine, wherein
the one or more processors are configured to
after the engine is stopped, close the on-off valve and the throttle valve to cause the exhaust gas to stay in the engine and the exhaust flow passage, to increase an amount of the exhaust gas to flow to pass through the catalyst during the scavenging control.