Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1994-11-10
1995-11-28
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123494, F02D 4116
Patent
active
054698316
ABSTRACT:
A fuel supply control system for an automotive engine determines a property of the fuel, such as the fifty percent distillation temperature T.sub.50 thereof, and the fuel injectors of the engine are controlled in accordance with the determined fuel property. When the engine is idling and the coolant water temperature WT of the engine is decreasing, the amplitude X of the feedback correction factor K.sub.2 for proportional-plus-integral control action is measured a number of times, and an average amplitude X.sub.0 thereof is calculated. The property of said fuel is determined on the basis of the thus calculated average amplitude X.sub.0 and the coolant water temperature WT using a two-dimensional map which gives the value of T.sub.50 as a function of the amplitude X of the feedback correction factor K.sub.2 and the coolant water temperature WT. The thus determined index T.sub.50 is stored in a RAM backed up by a battery. When a new fuel is supplied to the fuel tank, the value of index T.sub.50 is cleared to determine the index afresh.
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Mitsubishi Denki & Kabushiki Kaisha
Wolfe Willis R.
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