| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device for optimizing engine performance. SOLUTION: The amount of fuel delivered to an engine during operation at low and high temperatures is controlled using different sets of fuel rate maps designed to compensate for fuel quantity signals. A switching mechanism 78 based on engine coolant temperature is used to select which set of maps to use. When the engine coolant temperature is below a threshold level, a cold torque map 74 provides a signal representing the duration limit of time when fuel is to be injected. A compensating factor derived from a cold temperature smoke map 76 is used to adjust the cold torque map signal to limit the fuel amount to prevent excess smoke. When the engine coolant temperature is above the threshold level, a fuel duration limit signal from a standard temperature torque map 70 is compared to a fuel duration limit signal from a standard temperature smoke map 72, and the minimum between the two signals is selected for output to the fuel injectors. COPYRIGHT: (C)2009,JPO&INPIT
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