Vehicle with reduced emission of harmful component
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakashi Suzuki, Naoto Suzuki
Life of this patent
Estimating the term…
Abstract
An amount of oxygen accumulated in a catalytic converter after an engine stop by discontinuing a fuel supply to an engine is controlled to be within a preset range by controlling an engine speed into a preset range, controlling an engine revolution phase into a preset range, feeding air into the catalytic converter until the accumulated amount of oxygen becomes saturated, and controlling a catalytic converter temperature into a preset temperature range. Increase of an appropriate amount of the fuel at re-starting of the engine may prevent oxygen from deteriorating the NOx removing function without degrading an emission and the fuel efficiency.
Claims23
A vehicle, comprising:
- a power-train including an engine, a motor at least temporarily connected to the engine, a battery serving to supply power to the motor, and a generator selectively driven by at least the engine to charge the battery;
- a catalytic converter that purifies an exhaust gas from the engine;
- and
- a controller that
- controls fuel supply to the engine;
- determines whether an engine stop condition for stopping the engine is established and whether an engine re-start condition for re-starting the engine is established, on the basis of a traveling state of the vehicle;
- and
- discontinues the fuel supply to the engine when it is determined that the engine stop condition is established, and controls an engine speed such that an amount of oxygen accumulated in the catalytic converter during an engine stop is adjusted to be within a preset range;
- and
- re-starts the fuel supply for driving the engine when it is determined that the engine re-start condition is established, while temporarily increasing an amount of fuel supplied to the engine.
A method for controlling emission of a harmful component discharged from an engine of a vehicle provided with a power-train including the engine, a motor at least temporarily connected to the engine, a battery serving to supply power to the motor, a generator selectively driven by at least the engine to charge the battery, and a catalytic converter that purifies an exhaust gas of the engine, the method comprising the steps of.
- controlling fuel supply to the engine;
- determining whether an engine stop condition for stopping the engine is established and whether an engine re-start condition for re-starting the engine is established, on the basis of a traveling state of the vehicle;
- and
- discontinuing the fuel supply to the engine when it is determined that the engine stop condition is established, and controlling an engine speed such that an amount of oxygen accumulated in the catalytic converter during an engine stop is adjusted to be within a preset range;
- and
- re-starting the fuel supply for driving the engine when it is determined that the engine re-start condition is established, while temporarily increasing an amount of fuel supplied to the engine.
Dependencies are inferred from the claim text.