Control apparatus and method for internal combustion engine
First Claim
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1. A control apparatus for an internal combustion engine including:
- a first cylinder group;
a second cylinder group;
a first exhaust passage provided for the first cylinder group;
a second exhaust passage provided for the second cylinder group;
a first upstream catalyst provided in the first exhaust passage;
a second upstream catalyst provided in the second exhaust passage; and
a downstream catalyst provided in a third exhaust passage provided downstream of a confluence of the first exhaust passage and the second exhaust passage, the confluence being located downstream of the first upstream catalyst and the second upstream catalyst, the control apparatus comprising;
a fuel supply suspending portion that suspends supply of fuel to at least one of the first cylinder group and the second cylinder group under a predetermined state of the internal combustion engine;
a fuel supply suspension prohibiting portion that prohibits execution of the fuel supply suspension control by the fuel supply suspending portion when at least one of a temperature of the first upstream catalyst and a temperature of the second upstream catalyst is higher than a predetermined value; and
a fuel supply suspension prohibition switching portion that alternately switches the cylinder group in which the fuel supply suspension prohibiting control is executed by the fuel supply suspension prohibiting portion between the first cylinder group and the second cylinder group.
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Abstract
A control apparatus for an internal combustion engine that includes right and left banks, first and second catalysts provided in the right and left exhaust pipes, respectively, and a downstream catalyst provided in a common exhaust pipe downstream of the upstream catalysts is adapted to alternately switch execution of catalyst degradation minimization and execution of fuel cut between the two banks if at least one of the temperature of the first catalyst and temperature of the second catalyst is higher than a predetermined value during deceleration of the internal combustion engine.
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Citations
13 Claims
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1. A control apparatus for an internal combustion engine including:
- a first cylinder group;
a second cylinder group;
a first exhaust passage provided for the first cylinder group;
a second exhaust passage provided for the second cylinder group;
a first upstream catalyst provided in the first exhaust passage;
a second upstream catalyst provided in the second exhaust passage; and
a downstream catalyst provided in a third exhaust passage provided downstream of a confluence of the first exhaust passage and the second exhaust passage, the confluence being located downstream of the first upstream catalyst and the second upstream catalyst, the control apparatus comprising;a fuel supply suspending portion that suspends supply of fuel to at least one of the first cylinder group and the second cylinder group under a predetermined state of the internal combustion engine; a fuel supply suspension prohibiting portion that prohibits execution of the fuel supply suspension control by the fuel supply suspending portion when at least one of a temperature of the first upstream catalyst and a temperature of the second upstream catalyst is higher than a predetermined value; and a fuel supply suspension prohibition switching portion that alternately switches the cylinder group in which the fuel supply suspension prohibiting control is executed by the fuel supply suspension prohibiting portion between the first cylinder group and the second cylinder group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a first cylinder group;
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12. A control method for an internal combustion engine including:
- a first cylinder group;
a second cylinder group;
a first exhaust passage provided for the first cylinder group;
a second exhaust passage provided for the second cylinder group;
a first upstream catalyst provided in the first exhaust passage;
a second upstream catalyst provided in the second exhaust passage; and
a downstream catalyst provided in a third exhaust passage provided downstream of a confluence of the first exhaust passage and the second exhaust passage, the confluence being located downstream of the first upstream catalyst and the second upstream catalyst, the control method comprising;suspending supply of fuel to at least one of the first cylinder group and the second cylinder group under a predetermined state of the internal combustion engine; prohibiting execution of the fuel supply suspension control when at least one of a temperature of the first upstream catalyst and a temperature of the second upstream catalyst is higher than a predetermined value; and alternately switching the cylinder group in which the fuel supply suspension prohibiting control is executed between the first cylinder group and the second cylinder group.
- a first cylinder group;
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13. A control apparatus for an internal combustion engine including:
- a first cylinder group;
a second cylinder group;
a first exhaust passage provided for the first cylinder group;
a second exhaust passage provided for the second cylinder group;
a first upstream catalyst provided in the first exhaust passage;
a second upstream catalyst provided in the second exhaust passage; and
a downstream catalyst provided in a third exhaust passage provided downstream of a confluence of the first exhaust passage and the second exhaust passage, the confluence being located downstream of the first upstream catalyst and the second upstream catalyst, the control apparatus comprising;fuel supply suspending means for suspending supply of fuel to at least one of the first cylinder group and the second cylinder group under a predetermined state of the internal combustion engine; fuel supply suspension prohibiting means for prohibiting execution of the fuel supply suspension control by the fuel supply suspending means when at least one of a temperature of the first upstream catalyst and a temperature of the second upstream catalyst is higher than a predetermined value; and fuel supply suspension prohibition switching means for alternately switching the cylinder group in which the fuel supply suspension prohibiting control is executed by the fuel supply suspension prohibiting means between the first cylinder group and the second cylinder group.
- a first cylinder group;
Specification