Internal-combustion engines – Burning by highly compressed air – Oil engine air preheated
Reexamination Certificate
2007-09-18
2007-09-18
Huynh, Hai (Department: 3747)
Internal-combustion engines
Burning by highly compressed air
Oil engine air preheated
C123S526000, C123S431000
Reexamination Certificate
active
10552894
ABSTRACT:
At least one engine operating parameter other than total fuel energy content is taken into account when transitioning between operating modes in a dual fuel or other multimode engine (20) in order to maintain a smooth transition between modes. The parameter preferably comprises at least one of primary fuel excess air ratio (lambda) and ignition timing and preferably is controlled in addition to total fuel energy content control. Lambda control is especially beneficial because it permits the control system to compensate for the engine's inability to substantially alter the instantaneous air mass in the combustion chamber during the transition period. For instance, during a transition from pilot ignited gaseous fuel mode to diesel mode, the controlled parameter preferably comprises diesel lambda, and the controlling step comprises setting diesel lambda at a relatively high value at the beginning of the transition period and thereafter reducing diesel lambda during the transition period.
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Boyle Fredrickson , S.C.
Clean Air Power, Inc.
Huynh Hai
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