Patent ID: 7134423

Claim:
An ignition diagnostics and feedback control system comprising: an ignition diagnostics subsystem; and an ignition feedback control subsystem operably connected to said ignition diagnostics subsystem, wherein said ignition feedback control subsystem comprises: a closed loop cold start retard spark controller using ionization feedback having an input operably connected to said ionization signal; a closed loop MBT timing controller using ionization feedback having a misfire input operably connected to said misfire detector output, a knock input operably connected to said knock detector output and an output; an individual cylinder air to fuel ratio control system having an input operably to an output of said multi-criteria MBT timing estimator; an optimal wide open throttle air to fuel ratio controller having an input operably connected to said ionization signal; and an exhaust gas re-circulation controller having an input operably connected to said output of said closed loop MBT timing controller.