Intake and exhaust system
AssigneeSubaru Corporation
InventorHiroki Nagashima
Life of this patent
Estimating the term…
Abstract
An intake and exhaust system includes an engine, an exhaust flow passage, a catalyst, and a control apparatus. The exhaust flow passage is coupled to the engine. The catalyst is disposed in the exhaust flow passage and configured to purify exhaust gas. The control apparatus includes one or more processors, and one or more memories coupled to the one or more processors. 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 before the engine is started up, execute warming control that warms up the catalyst, based on a degree of purification of the exhaust gas by the catalyst during execution of the scavenging control.
Claims18
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.
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
- before the engine is started up, execute warming control that warms up the catalyst, based on a 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, wherein
- the one or more processors are further configured to
- close the on-off valve after the engine is stopped, and
- execute the scavenging control after the on-off valve is opened and before the engine is started up.
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
- before the engine is started up, execute warming control that warms up the catalyst, based on a degree of purification of the exhaust gas by the catalyst during execution of the scavenging control,
- the intake and exhaust system further comprising:
- an intake flow passage coupled to the engine;
- and
- a throttle valve disposed in the intake flow passage, wherein
- the one or more processors are further configured to
- close the throttle valve after the engine is stopped, and
- execute the scavenging control after the throttle valve is opened and before the engine is started up.
Dependencies are inferred from the claim text.