Internal-combustion engines – High tension ignition system – Multiple spark ignition system
Patent
1993-01-15
1994-08-02
Argenbright, Tony M.
Internal-combustion engines
High tension ignition system
Multiple spark ignition system
123643, F02P 515
Patent
active
053335937
ABSTRACT:
An energy-on-demand vehicular ignition system, particularly a coil-per-plug system ("CPP") with a programmable re-striking and minimum single-strike energy output whereby at idle engine speed and lowest load, each coil will be re-struck or discharged the maximum number of times permitted by the coil design within a limited time interval representing the beginning of the combustion event and occurring within 0-2% MFB, and preferably within 0.5% MFB, of the ignitable air fuel mixture within the combustion chamber. The CPP system also includes programmable re-striking whereby the system will default to a single-strike at conditions above a predetermined range of operating conditions, in particular, at a particular engine speed condition and a particular engine partial load condition. In between the conditions at (i) idle engine speed and lowest load on the one hand and, (ii) a predetermined engine speed and partial load condition. The ignition strategy includes the coil being re-struck more than once, but less than the maximum number of re-strikes permitted by the coil design, with the particular number of re-strikes being determined in accordance with a preset schedule as predetermined to be ideal for complete combustion at the operating conditions being sensed.
REFERENCES:
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Richard W. Anderson, "The Effect of Ignition System Power on Fast Burn Engine Combustion", SAE Technical Paper 870549, Feb. 1987.
Morganti Carl R.
Singh Gitanjli
Sweet Benjamin D.
Argenbright Tony M.
Dixon Richard D.
Ford Motor Company
May Roger L.
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