Control device and control method for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKuniaki Niimi
Life of this patent
Estimating the term…
Abstract
An engine ECU executes a program including: a step of estimating the occluded amount of NOx if an engine is self-rotating and a catalyst temperature is equal to or higher than a predetermined temperature Ta(0); and a step of performing NOx reduction treatment if the estimated occluded amount of NOx is equal to or more than a predetermined amount.
Claims16
A control device for a vehicle having an internal combustion engine and a rotating electric machine as drive sources, said internal combustion engine including an exhaust path through which exhaust gas produced by combusting fuel flows, and a catalyst provided in said exhaust path for occluding nitrogen oxide, stopping of said internal combustion engine being suppressed if a speed of said vehicle is equal to or higher than a predetermined speed, comprising:
- a temperature detection unit detecting a temperature of said catalyst;
- a rotation speed detection unit detecting a rotation speed of said internal combustion engine;
- a load detection unit detecting a load of said internal combustion engine;
- and
- a reduction treatment unit performing reduction treatment of the nitrogen oxide in said catalyst if a first condition that said detected rotation speed and load are a rotation speed and a load within a self-rotation speed region of said internal combustion engine, and a second condition that said detected temperature of said catalyst is equal to or higher than a predetermined temperature at which the nitrogen oxide occluded by said catalyst can be reduced are satisfied,
- said self-rotation speed region being a rotation speed region corresponding to a state where said internal combustion engine, stopping of which is suppressed as the speed of said vehicle is equal to or higher than said predetermined speed, continues operating without performing work.
(canceled)
A control method for a vehicle having an internal combustion engine and a rotating electric machine as drive sources, said internal combustion engine including an exhaust path through which exhaust gas produced by combusting fuel flows, and a catalyst provided in said exhaust path for occluding nitrogen oxide, stopping of said internal combustion engine being suppressed if a speed of said vehicle is equal to or higher than a predetermined speed, comprising the steps of:
- detecting a temperature of said catalyst;
- detecting a rotation speed of said internal combustion engine;
- detecting a load of said internal combustion engine;
- and
- performing reduction treatment of the nitrogen oxide in said catalyst if a first condition that said detected rotation speed and load are a rotation speed and a load within a self-rotation speed region of said internal combustion engine, and a second condition that said detected temperature of said catalyst is equal to or higher than a predetermined temperature at which the nitrogen oxide occluded by said catalyst can be reduced are satisfied,
- said self-rotation speed region being a rotation speed region corresponding to a state where said internal combustion engine, stopping of which is suppressed as the speed of said vehicle is equal to or higher than said predetermined speed, continues operating without performing work.
(canceled)
Dependencies are inferred from the claim text.