Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2006-02-28
2006-02-28
Huynh, Hai (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S491000, C123S527000
Reexamination Certificate
active
07004147
ABSTRACT:
Fuel injection control methods and systems and related apparatus for Liquefied Petroleum gas Injection (LPI) engine are provided. Preferred methods and systems determine the increased amount of engine revolution per unit time and fuel temperature during an initial engine start period; determine fuel pressure on the basis of such values; determines propane content of the engine fuel by consideration of the fuel pressure and fuel temperature of the P-T diagram of the fuel; and controls the fuel injection time and injection period by using a map prepared according to propane content. Preferred systems and methods of the invention need not include use of fuel pressure and temperature sensors that provide injection control conditions to an Engine Control Unit, thereby providing a simplified and more efficient apparatus.
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Corless Peter F.
Edwards Angell Palmer & & Dodge LLP
Huynh Hai
Hyundai Motor Company
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