Exhaust purifying apparatus and exhaust purifying method for internal combustion engine
AssigneesToyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Toyota Jidoshokki
InventorsHiroki Matsuoka, Yukihisa Yamamoto
Life of this patent
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Abstract
In an exhaust purifying apparatus for an internal combustion engine on a vehicle, heating control is executed for supplying fuel to exhaust purification catalysts, thereby increasing the catalyst bed temperature. The heating control is suspended when the vehicle is determined to be driving downhill. Adverse influences due to deactivation of the exhaust purification catalysts during the heating control are reliably avoided.
Claims8
An exhaust purifying apparatus for an internal combustion engine on a vehicle, the apparatus comprising:
- a regeneration control section, wherein the regeneration control section controls regeneration of an exhaust purification catalyst through heating control, in which fuel is supplied to the exhaust purification catalyst, thereby increasing a bed temperature of the catalyst;
- and
- a determining section that determines whether the vehicle is driving downhill,
- wherein the regeneration control section suspends the heating control when the determining section determines that the vehicle is driving downhill, and
- wherein the regeneration control section suspends the heating control only when the determining section continuously determines for a predetermined period that the vehicle is driving downhill.
(canceled)
An exhaust purifying method for an internal combustion engine on a vehicle, the method comprising:
- supplying fuel to an exhaust purification catalyst to increase a bed temperature of the catalyst, thereby regenerating the exhaust purification catalyst;
- determining whether the vehicle is driving downhill;
- and
- suspending the supply of fuel to the exhaust purification catalyst when the vehicle is determined to be driving downhill,
- wherein the supply of fuel to the exhaust purification catalyst is suspended only when the vehicle is continuously determined for a predetermined period to be driving downhill.
Dependencies are inferred from the claim text.