Engine knock prevention system and method
AssigneeFord Global Technologies, LLC
InventorsIlya V Kolmanovsky, Julia Helen Buckland, Jeffrey Arthur Cook, Jing Sun
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Abstract
A system and a method for improving engine performance by utilizing a variable compression ratio mechanism and a boosting mechanism are presented. The performance is improved by coordinating the control of ignition timing, compression ratio, and engine boosting while at the same time minimizing engine knock, preventing undesirable interaction, and providing optimal fuel economy. According to the present invention, adjusting ignition timing and compression ratio can be done either sequentially or concurrently.
Claims18
A system comprising:
- an engine having a variable compression ratio mechanism;
- and
- a controller operating the system in a first region, and during said operation in said first region:
- detecting engine knock in said first region, and in response to said detection, adjusting ignition timing to abate said detected knock in said first region;
- and
- operating the system in a second region, and during said operation in said second region:
- detecting engine knock in said second region, and in response to said detection, adjusting compression ratio of said compression ratio mechanism to abate said detected knock in said second region.
A method for controlling knock of an internal combustion engine having a variable compression ratio mechanism, the method comprising:
- indicating engine knock;
- in response to said indication, first adjusting ignition timing to reduce said engine knock;
- determining whether engine knock is still indicated, and if so, second adjusting the variable compression ratio mechanism to reduce said engine knock.
Dependencies are inferred from the claim text.