Ignition timing control

Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...

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F02P 514

Patent

active

058030468

ABSTRACT:
Automotive internal combustion engine ignition timing control operations for varying timing of engine cylinder combustion chamber ignition events models the lead-lag combustion chamber temperature change profile under a transition from a first to a second engine operating condition and varies ignition timing following the transition in response to the temperature change profile. The lead-lag profile is implemented by applying a step change in ignition timing followed by a more gradual timing change, such as along a first order lag trajectory, toward a final ignition timing following the transition, and is updated in synchronism with engine cylinder events to account for a dependence on engine speed.

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