FUEL FEED DEVICE FOR ENGINE
PURPOSE:To prevent an air-fuel mixture from coming into being overlean, by limiting a degree of suction temperature compensation at a time when output of a suction temperature sensor detects a specified operating region which shows a higher value than that in the actual suction temperature. CONSTITU...
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Zusammenfassung: | PURPOSE:To prevent an air-fuel mixture from coming into being overlean, by limiting a degree of suction temperature compensation at a time when output of a suction temperature sensor detects a specified operating region which shows a higher value than that in the actual suction temperature. CONSTITUTION:When a suction temperature compensation circuit 17 is added with an on-signal out of an ignition switch 9 and judges a warm starting period from each A/D converter output out of an engine speed sensor 10 and a water temperature sensor 7, it sets a setting value T to a timer. And, the A/D converter output of a suction temperature sensor 8 is stored in a register, while it is substracted from the setting value T, and suction temperature is multiplied by a compensation factor K, for example, 0.8 whereby it is slightly compensated. This compensated suction temperature Ta is outputted therefrom, and pulse width of a fundamental fuel injection pulse out of a map 14 is compensated at an opertion circuit 20 by way of a D/A converter 18 and a function generator circuit 19. Next, when the timer setting value T comes to nil, the suction temperature prior to compensation is outputted as it is. With this constitution, an air-fuel mixture is obviated so that an output drop and an engine stall are preventable from occurring. |
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