Utilization of air-assisted direct injection, cylinder deactivation and camshaft phasing for improved catalytic converter light-off in internal combustion engines
First Claim
1. A vehicle engine control system comprising:
- an engine that includes a plurality of cylinders and that generates exhaust gas;
an air-assisted direct injection fuel system that supplies an air/fuel mixture to said cylinders;
a catalytic converter that reduces hydrocarbon emissions from said exhaust gas after said catalytic converter reaches a light-off temperature;
a controller that communicates with said engine and said air-assisted direct injection fuel system and that deactivates at least one of said cylinders of said engine before said catalytic converter achieves said light-off temperature to hasten light-off of said catalytic converter, wherein said controller optimizes engine operating parameters to hasten light-off of said catalytic converter;
wherein said controller modifies cam phasing based on at least one of integrated hydrocarbon emissions and exhaust gas energy.
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Accused Products
Abstract
A vehicle engine control system controls an engine that includes a plurality of cylinders and that generates exhaust gas. An air-assisted direct injection fuel system supplies an air/fuel mixture to the cylinders. A catalytic converter reduces harmful emissions from the exhaust gas after the catalytic converter reaches a light-off temperature. A controller communicates with the engine, the catalytic converter and the air-assisted direct injection fuel system. The controller optimizes cam phasing, the air/fuel mixture and spark angle for full and partial engine operating modes. The controller deactivates at least one of the cylinders of the engine before the catalytic converter achieves the light-off temperature to hasten light-off of the catalytic converter.
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Citations
41 Claims
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1. A vehicle engine control system comprising:
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an engine that includes a plurality of cylinders and that generates exhaust gas;
an air-assisted direct injection fuel system that supplies an air/fuel mixture to said cylinders;
a catalytic converter that reduces hydrocarbon emissions from said exhaust gas after said catalytic converter reaches a light-off temperature;
a controller that communicates with said engine and said air-assisted direct injection fuel system and that deactivates at least one of said cylinders of said engine before said catalytic converter achieves said light-off temperature to hasten light-off of said catalytic converter, wherein said controller optimizes engine operating parameters to hasten light-off of said catalytic converter;
wherein said controller modifies cam phasing based on at least one of integrated hydrocarbon emissions and exhaust gas energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15)
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10. The vehicle engine control system of 2 wherein said spark angle is modified by a lookup table that is accessed using at least one of injection air pressure, air temperature, coolant temperature, rpm, and cylinder load.
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16. A vehicle engine control system comprising:
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an engine that includes a plurality of cylinders and that generates exhaust gas;
an air-assisted direct injection fuel system that supplies an air/fuel mixture to said cylinders;
a catalytic converter that reduces hydrocarbon emissions from said exhaust gas after said catalytic converter reaches a light-off temperature; and
a controller that communicates with said engine and said air-assisted direct injection fuel system and that modifies cam phasing to rebreathe said hydrocarbon emissions, enleans an average air/fuel mixture, and retards spark angle to hasten catalytic converter light-off. - View Dependent Claims (17, 18, 19, 20)
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21. A method for controlling an internal combustion engine, comprising:
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supplying an air/fuel mixture to cylinders of an engine that generates exhaust gas using an air-assisted direct injection fuel system;
reducing hydrocarbon emissions from said exhaust gas using a catalytic converter after said catalytic converter reaches a lift-off temperature;
deactivating at least one of said cylinders of said engine before said catalytic converter achieves said light-off temperature to hasten light-off of said catalytic converter; and
modifying said cam phasing to minimize integrated hydrocarbon emissions and to maximize exhaust gas energy. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A vehicle engine control method comprising:
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supplying an air/fuel mixture to cylinders of an engine that generates exhaust gas using an air-assisted direct injection fuel system;
reducing hydrocarbon emissions from said exhaust gas using a catalytic converter after said catalytic converter reaches a light-off temperature; and
modifying cam phasing of said engine, enleaning average air/fuel ratio of said engine, and retarding a spark angle of said engine to hasten catalytic converter light-off. - View Dependent Claims (36, 37, 38, 39, 40)
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41. A vehicle engine control system comprising:
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an engine that includes a plurality of cylinders and that generates exhaust gas;
a fuel system that supplies an air/fuel mixture to said cylinders;
a catalytic converter that reduces hydrocarbon emissions from said exhaust gas after said catalytic converter reaches a light-off temperature;
a controller that communicates with said engine and said fuel system and that deactivates at least one of said cylinders of said engine before said catalytic converter achieves said light-off temperature to hasten light-off of said catalytic converter, wherein said controller optimizes engine operating parameters to hasten light-off of said catalytic converter; and
wherein said controller modifies cam phasing to control hydrocarbon emissions.
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Specification