Vehicle and control method thereof
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsIkuo Ando, Kazuki Kunishima
Life of this patent
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Abstract
When both catalyst degradation and catalyst odor need to be suppressed when a fuel cut condition is satisfied, a fuel cut control is executed giving priority to control for suppressing catalyst odor, though a required air amount G* for idling is drawn in at that time. Therefore, when shifting the engine into an idle state to suppress catalyst degradation after the catalyst odor has been eliminated, the required air amount G* for idling is already being drawn in so there is no need to adjust the air amount. As a result, there is no time delay for air amount adjustment. Therefore, after the control to suppress catalyst odor has ended, a smooth shift can be made into control to suppress degradation of the exhaust gas control catalyst.
Claims9
A vehicle comprising:
- an internal combustion engine that burns a mixture of air and fuel;
- an exhaust gas control catalyst that purifies exhaust gas discharged from the internal combustion engine;
- a fuel injection apparatus that injects fuel into the internal combustion engine;
- an air amount adjusting apparatus that adjusts the amount of air drawn into the internal combustion engine;
- and
- a control apparatus which, when a catalyst degradation condition and a catalyst odor producing condition are satisfied when a fuel cut condition is satisfied, sets a required air amount for idling based on an operating state of the vehicle, adjusts the air amount adjusting apparatus such that the required air amount is drawn in, and controls the fuel injection apparatus such that a fuel cut is performed, and when a predetermined catalyst odor eliminated condition is satisfied thereafter, controls the fuel injection apparatus and the air amount adjusting apparatus such that the internal combustion engine idles.
A control method for a vehicle that includes an internal combustion engine that burns a mixture of air and fuel, an exhaust gas control catalyst that purifies exhaust gas discharged from the internal combustion engine, fuel injecting means for injecting fuel into the internal combustion engine, and air amount adjusting means for adjusting the amount of air drawn into the internal combustion engine, comprising the steps of:
- (a) when a catalyst degradation condition and a catalyst odor producing condition are satisfied when a fuel cut condition is satisfied, setting a required air amount for idling based on an operating state of the vehicle, adjusting the air amount adjusting means such that the required air amount is drawn in, and controlling the fuel injecting means such that a fuel cut is performed;
- and
- (b) when a predetermined catalyst odor eliminated condition is satisfied after step (a), controlling the fuel injecting means and the air amount adjusting means such that the internal combustion engine idles.
Dependencies are inferred from the claim text.