Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2002-09-03
2004-01-06
Tran, Binh (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S278000, C060S280000, C060S295000, C060S297000, C180S065230, C180S065310
Reexamination Certificate
active
06672050
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an exhaust gas purification device of an engine.
2. Description of the Related Art
Known in the art is a vehicle provided with a so-called hybrid type power generation device designed to generate the drive power of the vehicle by a combination of an output torque of an internal combustion engine and an output torque of an electric motor, where a catalyst arranged in an engine exhaust passage is rapidly warmed by using the electric motor to the maximum extent as the drive power of the vehicle, operating the internal combustion engine independently from the running of the vehicle at that time, making the air-fuel ratio for warming the catalyst the stoichiometric air-fuel ratio, and greatly delaying the ignition timing (see “87. The Cleanest Car e no Chosen, Sono 2—Teerupaipuemisshon no Teigen” (87. Challenge of the Cleanest Car, Part 2—Reduction of Tail Pipe Emission), Society of Automotive Engineers of Japan Preprints No. 19-00, No. 20005/88.)
The internal combustion engine being used in such a vehicle is a gasoline engine. Therefore, since the temperature of the exhaust gas is high, once the catalyst is warmed, it is maintained in the warmed state during engine operation. Therefore, in this vehicle, the operation is specially controlled to warm up the catalyst only at the time of engine startup.
At the present time, however, the inventors etc. are working on the development of an exhaust gas purification device designed to continuously remove by oxidation particulate exhausted from an engine onto a particulate filter arranged in the engine exhaust passage. In this exhaust gas purification device, however, they found that the continuous oxidation removal action of particulate is only performed in a limited partial operating region of the engine operating region even after the particulate filter finishes being warmed up.
Therefore, in this exhaust gas purification device, it is necessary to specially control the operation so as to cause the oxidation removal action of the particulate to be continuously performed in order to get the particulate continuously removed by oxidation even after the particulate filter finishes being warmed up.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an exhaust gas purification device designed to cause the oxidation removal action of particulate to be continuously performed as much as possible even when continuous oxidation removal action of particulate by oxidation is only performed at a partial engine operating region after the particulate filter finishes being warmed up.
According to a first aspect of the present invention, there is provided an exhaust gas purification device of an internal combustion engine in which a particulate filter for trapping particulate in an exhaust gas is arranged in an engine exhaust passage, deposited particulate on the particulate filter can be continuously removed by oxidation without being accompanied by occurrence of a luminous flame when performing continuous combustion under a lean air-flow ratio, and a continuous oxidation removal region of the deposited particulate is determined by a temperature of the particulate filter and an amount of exhausted particulate exhausted from the engine, wherein an electric power device able to generate vehicle drive power separate from the vehicle drive power of the engine and able to generate electric power from the engine is provided and a battery for supplying electric power for driving the vehicle to the electric power device and for being charged by the electric power generated by the electric power device is provided; and, after the particulate filter finishes being warmed up at the time of engine startup, when the temperature of the particulate filter falls below a temperature at which deposited particulate can be continuously removed by oxidation, an output torque of the engine is increased from a required torque so that the temperature of the particulate filter becomes a temperature at which deposited particulate can be continuously removed by oxidation and the amount of increase in output torque is consumed for the power generating action by the electric power device.
According to a second aspect of the present invention, there is provided an exhaust gas purification device of an internal combustion engine in which a particulate filter for trapping particulate in an exhaust gas is arranged in an engine exhaust passage, deposited particulate on the particulate filter can be continuously removed by oxidation without being accompanied by occurrence of a luminous flame when performing continuous combustion under a lean air-flow ratio, and a continuous oxidation removal region of the deposited particulate is determined by a temperature of the particulate filter and an amount of exhausted particulate exhausted from the engine, wherein an electric power device able to generate vehicle drive power separate from the vehicle drive power of the engine and able to generate electric power from the engine is provided and a battery for supplying electric power for driving the vehicle to the electric power device and for being charged by the electric power generated by the electric power device is provided; and, after the particulate filter finishes being warmed up at the time of engine startup, when the amount of exhausted particulate is greater than an amount of exhausted particulate at which the deposited particulate can be continuously removed by oxidation, an output torque of the engine is decreased from a required torque so that the amount of exhausted particulate becomes an amount at which the deposited particulate can be continuously removed by oxidation and the amount of decrease in output torque is compensated for by the vehicle drive power from the electric power device.
According to a third aspect of the present invention, there is provided an exhaust gas purification device of an internal combustion engine in which a particulate filter for trapping particulate in an exhaust gas is arranged in an engine exhaust passage, deposited particulate on the particulate filter can be continuously removed by oxidation without being accompanied by occurrence of a luminous flame when performing continuous combustion under a lean air-flow ratio, and a continuous oxidation removal region of the deposited particulate is determined by a temperature of the particulate filter and an amount of exhausted particulate exhausted from the engine, wherein after the particulate filter finishes being warmed up at the time of engine startup, at the time of steady engine operation, a continuous oxidation removal region of deposited particulate is formed in a limited partial operating region of the operating region of the engine; an electric power device able to generate vehicle drive power separate from the vehicle drive power of the engine and able to generate electric power from the engine is provided and a battery for supplying electric power for driving the vehicle to the electric power device and for being charged by the electric power generated by the electric power device is provided; and, after the particulate filter finishes being warmed up at the time of engine startup, when the output torque of the engine is lower than an output torque of the limited partial operating region, the output torque of the engine is increased from the required torque so that the output torque of the engine becomes the output torque of the limited partial operating region and the amount of increase in output torque is consumed for the power generating action of the electric power device.
According to a fourth aspect of the present invention, there is provided an exhaust gas purification device of an internal combustion engine in which a particulate filter for trapping particulate in an exhaust gas is arranged in an engine exhaust passage, deposited particulate on the particulate filter can be continuously removed by oxidation without being accompanied by occurrence of a luminous flame when performi
Asanuma Takamitsu
Hirota Shinya
Igarashi Kohei
Igarashi Setsuko
Itoh Kazuhiro
Igarashi Setsuko
Toyota Jidosha & Kabushiki Kaisha
Tran Binh
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