Catalyst warming-up controller for internal combustion engine
AssigneeDenso Corporation
InventorsMakoto MIWA, Hiroyuki INUZUKA
Life of this patent
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Abstract
A catalyst warming-up controller executes a catalyst warming-up control in which an ignition timing is retarded to warm-up a catalyst and performs a compression-stroke injection in which a fuel is injected into a cylinder in a compression stroke. While the catalyst warming-up control is executed, a variable valve timing controller controls a valve timing of an intake valve and/or an exhaust valve to establish a negative-valve-overlap period in which both of the exhaust valve and the intake valve are closed. A fuel injector injects the fuel into a cylinder in this period and a quantity of the compression-stroke injection is decreasingly corrected according to the injection quantity in the above period.
Claims9
A catalyst warming-up controller for an internal combustion engine, which executes a catalyst warming-up control in which an ignition timing is retarded to warm-up a catalyst and which performs a compression-stroke injection in which a fuel is injected into a cylinder at least in a compression stroke, the catalyst warming-up controller comprising:
- an NVO-injection control portion which defines a negative-valve-overlap period in which an exhaust valve and an intake valve are both closed at least in a posterior half of an exhaust stroke while the catalyst warming-up control is executed, the NVO-injection control portion which performs an NVO-injection in which the fuel is injected into the cylinder in the negative-valve-overlap period;
- and
- a correcting portion which corrects a fuel injection quantity in the compression stroke according to a fuel injection quantity of the NVO-injection.
A catalyst warming-up controller for an internal combustion engine, which executes a catalyst warming-up control in which an ignition timing is retarded to warm-up a catalyst and which performs a compression-stroke injection in which a fuel is injected into a cylinder at least in a compression stroke, the catalyst warming-up controller comprising:
- an NVO-injection control portion which defines a negative-valve-overlap period in which an exhaust valve and an intake valve are both closed at least in a posterior half of an exhaust stroke while the catalyst warming-up control is executed, the NVO-injection control portion which performs an NVO injection in which the fuel is injected into the cylinder in the negative-valve-overlap period;
- a fuel-improvement-degree detecting portion which detects an improvement degree of the fuel which has been injected into the cylinder in the negative-valve-overlap period;
- and
- a correcting portion which corrects a fuel injection quantity in the compression stroke according to the improvement degree of the fuel detected by the fuel-improvement-degree detecting portion.
Dependencies are inferred from the claim text.