Method and system for pre-ignition control
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, Chris Richard Weber, John Eric Rollinger
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for identifying and differentiating knock and pre-ignition using a plurality of knock sensors distributed along an engine block. By dynamically adjusting cylinder-specific assignment of the knock sensors for knock detection and pre-ignition detection based on operating conditions of each cylinder, knock and pre-ignition is more reliably identified and distinguished.
Claims10
A method of operating an engine including a plurality of knock sensors distributed on an engine block, comprising:
- during engine operation:
- dynamically selecting a knock-indicating sensor from among the plurality of knock sensors for identifying knock in a cylinder, and dynamically selecting a pre-ignition-indicating sensor from among the plurality of knock sensors for identifying pre-ignition in the cylinder, the selections based on operating conditions, where during a first condition, the knock-indicating sensor is the same as the pre-ignition-indicating sensor, and during a second condition, the knock-indicating sensor is different from the pre-ignition-indicating sensor, the selections being performed for each engine cylinder.
A method of operating an engine including a plurality of knock sensors distributed on an engine block, comprising:
- during engine operation:
- dynamically selecting a knock-indicating sensor from among the plurality of knock sensors for identifying knock in a cylinder, and dynamically selecting a pre-ignition-indicating sensor from among the plurality of knock sensors for identifying pre-ignition in the cylinder, the selections based on operating conditions, including during a first condition, dynamically selecting a plurality of knock-indicating sensors from among the plurality of knock sensors for identifying knock in the cylinder;
- during a second condition, dynamically selecting a plurality of pre-ignition-indicating sensors from among the plurality of knock sensors for identifying pre-ignition in the cylinder;
- and during a third condition, dynamically selecting a plurality of knock-indicating sensors from among the plurality of knock sensors for identifying knock in the cylinder, and dynamically selecting a plurality of pre-ignition-indicating sensors from among the plurality of knock sensors for identifying pre-ignition in the cylinder, wherein during the first condition, each of the plurality of knock-indicating sensors is different from the pre-ignition-indicating sensor;
- during the second condition, each of the plurality of pre-ignition-indicating sensors is different from the knock-indicating sensor;
- and during the third condition, each of the plurality of knock-indicating sensors is different from each of the pre-ignition-indicating sensors.
Dependencies are inferred from the claim text.