METHOD FOR CONTROLLING AN ENGINE
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Abstract
A method for operating an engine is disclosed. In one example, the method adjusts a torque limit of the engine in response to an amount of EGR in an engine cylinder. The approach may reduce the possibility of pre-ignition for boosted engines.
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Citations
35 Claims
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1-20. -20. (canceled)
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21. A method for controlling an engine, comprising:
adjusting an engine torque limit in response to an amount of EGR in a cylinder of the engine, where the engine torque limit is decreased in response to a decreasing amount of EGR entering engine cylinders, and where the engine torque limit is increased in response to an increasing amount of EGR entering engine cylinders. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A system for controlling an engine, comprising:
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an engine, the engine including an intake manifold; an EGR system including an EGR valve in communication with the engine; a torque actuator in communication with the engine; and a controller, the controller including instructions for adjusting a torque limit of the engine via adjusting the torque actuator in response to an amount of EGR available from the EGR system, the controller including further instructions to increase the torque limit of the engine when an amount of EGR available from the EGR system increases and to adjust a position of the EGR valve in response to an estimated or measured amount of air in an EGR passage, and further comprising controller instructions to increase the torque limit of the engine while a temperature of the EGR is less than a threshold temperature. - View Dependent Claims (28, 29, 30, 31)
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32. A system for controlling an engine, comprising:
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an engine, the engine including an intake manifold; an EGR system including an EGR valve in communication with the engine; a torque actuator in communication with the engine; and a controller, the controller including instructions for adjusting a torque limit of the engine via adjusting the torque actuator in response to an amount of EGR available from the EGR system, the controller including further instructions to increase the torque limit of the engine when an amount of EGR available from the EGR system increases, where the controller includes further instructions for adjusting the torque limit in response to a temperature of the engine - View Dependent Claims (33, 34, 35)
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Specification