Methods and systems for engine
AssigneeTransportation IP Holdings, LLC
InventorsJacob Kenneth Pedder, James Robert Mischler
Life of this patent
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Abstract
Methods and systems are provided for controlling fueling and mitigating knock in internal combustion engines, such as multi-fuel engines. In one example, a method may include monitoring a frequency of knock events corresponding to one or more engine cylinders, and dynamically increasing a substitution ratio while the frequency of knock events is less than a maximum action threshold. In some examples, the method may further include actively adjusting one or more engine operating conditions to decrease the substitution ratio responsive to a severity of knocking in the one or more engine cylinders being greater than or equal to a threshold severity.
Claims20
A method executed by a controller of a multi-fuel engine comprising instructions stored in non-transitory memory of the controller, the method comprising:
- monitoring a frequency of knock events corresponding to one or more cylinders of the multi-fuel engine entering multi-fuel operation;
- and
- in a first mode, dynamically increasing a substitution ratio of the one or more cylinders while the frequency of knock events is less than a maximum action threshold.
A system, comprising:
- an engine comprising a plurality of engine cylinders;
- and
- an engine controller communicably coupled to the engine, the engine controller executing instructions stored in non-transitory memory to:
- operate the engine according to an operator-requested engine operating state;
- and
- responsive to:
- at least one engine cylinder of the plurality of engine cylinders entering multi-fuel operation,
- receiving an indication of knocking in the at least one engine cylinder, and
- during a first mode of engine operation, determining the knocking to be significant based on a rate of knocking per combustion cycle in the at least one engine cylinder being outside of a statistical confidence interval of an expected rate:
- adjust a substitution ratio for the at least one engine cylinder to mitigate the significant knocking.
A system for an engine, the system comprising:
- a plurality of cylinders susceptible to knocking;
- and
- a controller executing instructions stored in non-transitory memory to:
- detect knocking in one or more of the plurality of cylinders entering multi-fuel operation;
- responsive to a severity of the detected knocking being less than a threshold severity:
- dynamically update one or more reference engine operating conditions stored in non-transitory memory, and
- operate the engine according to the one or more dynamically updated reference engine operating conditions to mitigate the detected knocking;
- and
- responsive to the severity of the detected knocking being greater than or equal to the threshold severity, adjust one or more current engine operating conditions to adjust a substitution ratio without updating the one or more reference engine operating conditions to mitigate the detected knocking.
Dependencies are inferred from the claim text.