Control system for a model-based knock suppression system using a multiple actuation strategy
AssigneeCummins Inc.
InventorDavid Stroh
Life of this patent
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Abstract
The present invention provides for predicting peak cylinder temperatures above which knock in an engine may become more frequent and then provides one or more actuation approaches to reduce the knock of the engine while maintaining engine performance. The actuation approaches of the present invention include one or more of direct injection, engine gas recirculation, and spark retarding, where the application of one or more the actuation approaches is determined based upon using operational and engine characteristic inputs as well as modeling and estimation values as inputs in a feedforward control methodology.
Claims20
A method, comprising:
- receiving a plurality of input conditions regarding an engine;
- determining an estimate temperature threshold for knock and one or more peak end gas temperature estimates based on the plurality of input conditions;
- selectively executing at least one of a first actuation event, a second actuation event, and a third actuation event;
- wherein the first actuation event is not executed when the one or more peak end gas temperature estimates is less than the estimated temperature threshold for knock, and wherein the first actuation event is executed when the one or more peak end gas temperature estimates is greater than or equal to the estimated temperature threshold for knock.
An apparatus, comprising:
- a feedforward control module structured to receive a first plurality of inputs regarding operation of an engine, wherein the feedforward control module is structured to determine an estimate temperature threshold for knock and one or more peak end gas temperature estimates responsive to the first plurality of inputs;
- and
- a control module including the feedforward control module, wherein the control module is structured to selectively execute at least one of a first actuation event, a second actuation event, and a third actuation event;
- wherein the control module is structured to not execute the first actuation event when the one or more peak end gas temperature estimates is less than the estimated temperature threshold for knock, and wherein control module is structured to execute the first actuation event when the one or more peak end gas temperature estimates is greater than or equal to the estimated temperature threshold for knock.
A system, comprising:
- an engine;
- an exhaust gas recirculation (EGR) system fluidly coupled to the engine;
- and
- a controller communicably coupled to both the engine and the EGR system, the controller structured to:
- receive a plurality of input conditions regarding an engine;
- determine an estimate temperature threshold for knock and one or more peak end gas temperature estimates based on the plurality of input conditions;
- and
- selectively execute at least one of a first actuation event, a second actuation event, and a third actuation event based at least in part on the determined estimate temperature threshold for knock and the one or more peak end gas temperature estimates;
- wherein the first actuation event is not executed when the one or more peak end gas temperature estimates is less than the estimated temperature threshold for knock, and wherein the first actuation event is executed when the one or more peak end gas temperature estimates is greater than or equal to the estimated temperature threshold for knock.
Dependencies are inferred from the claim text.