Device for purifying the exhaust gas of an internal combustion engine
First Claim
1. A device for purifying the exhaust gas of an internal combustion engine comprising:
- a particulate trap disposed in the engine exhaust system;
an exhaust gas recirculation passage communicating the upstream of said particulate trap in said engine exhaust system with the engine intake system;
a control valve for controlling the amount of exhaust gas recirculated through said exhaust gas recirculation passage to be an optimum amount in accordance with an engine operating condition;
a fresh air detection means for detecting an amount of fresh air introduced into said engine intake system during a fuel-cut; and
an estimation means for estimating an amount of particulate trapped by said particulate trap on the basis of said amount of fresh air detected by said fresh air detection means after said control valve is opened to a predetermined opening degree.
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Accused Products
Abstract
A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device comprises a particulate trap disposed in the engine exhaust system, an exhaust gas recirculation passage communicating the upstream of the particulate trap in the engine exhaust system with the engine intake system, a control valve for controlling the amount of exhaust gas recirculated through the exhaust gas recirculation passage to be an optimum amount in accordance with an engine operating condition. In the device, an amount of the fresh air introduced into the engine intake system during a fuel-cut is detected, and an amount of particulate trapped by the particulate trap is estimated on the basis of the amount of fresh air detected after the control valve is opened to a predetermined opening degree.
74 Citations
14 Claims
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1. A device for purifying the exhaust gas of an internal combustion engine comprising:
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a particulate trap disposed in the engine exhaust system;
an exhaust gas recirculation passage communicating the upstream of said particulate trap in said engine exhaust system with the engine intake system;
a control valve for controlling the amount of exhaust gas recirculated through said exhaust gas recirculation passage to be an optimum amount in accordance with an engine operating condition;
a fresh air detection means for detecting an amount of fresh air introduced into said engine intake system during a fuel-cut; and
an estimation means for estimating an amount of particulate trapped by said particulate trap on the basis of said amount of fresh air detected by said fresh air detection means after said control valve is opened to a predetermined opening degree. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for purifying the exhaust gas of an internal combustion engine comprising:
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a particulate trap disposed in the engine exhaust system;
an exhaust gas recirculation passage communicating the upstream of said particulate trap in said engine exhaust system with the engine intake system;
a control valve for controlling the amount of exhaust gas recirculated through said exhaust gas recirculation passage to be an optimum amount in accordance with the engine operating condition;
a pressure differential detection means for detecting directly or indirectly a pressure differential between the upstream side and the downstream side of said particulate trap during a fuel-cut after said control valve is fully closed and after a throttle valve disposed on said engine intake system is fully opened; and
an estimation means for estimating an amount of particulate trapped by said particulate trap on the basis of said pressure differential detected by said pressure differential detection means.
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Specification