Fuel injection, basic function
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Fuel injection, basic function
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1.
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Basic calculation of fuel quantity/combustion
The current air mass/combustion is divided by 14.7 and sent to box 2. The unit is now mg fuel/combustion.
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2.
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Compensation
In the case of a cold engine, shortly after starting, rapid load changes, knocking or high loads, the current value is multiplied by a compensation factor.
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3.
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Closed loop
The closed loop value is used as a multiplier. The value is sent to box 4.
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4.
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Correction for purging
Multiply by the value for purge adaptation. The value is sent to box 5.
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5.
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Multiplicative adaptation
The multiplicative adaptation value is used as a multiplier and the new value is sent to box 6.
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6.
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Additive adaptation
The additive adaptation value is added and the new value sent to box 7.
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7.
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Starting fuel quantity
If the engine has not yet started, starting fuel is selected. The value is sent to box 8.
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8.
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Fuel quantity/combustion to be injected
The fuel quantity/combustion is the amount of petrol to be supplied to the engine. The value is sent to box 9.
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9.
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Injector opening duration
Converts the value to the time during which the injector must be open and the new value is sent to box 10.
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10.
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Injection twice/combustion
Injection takes place twice/combustion until the camshaft position has been found. Injection duration is divided by two. The value is sent to box 11.
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11.
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Voltage dependent needle lift duration added
Adds the injector time delay, which is voltage dependent. The value is sent to box 12.
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12.
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Fuel shut-off
The value is sent to box 13 unless fuel shut-off is active.
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13.
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Activation of injector
At a determined crankshaft angle, the microprocessor will control the transistor for the injector that is next in the firing order.
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