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 mass/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 a high load, the current value is multiplied by a compensation factor.
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3.
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Closed loop
The closed loop control system value is also 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 purging adaptation. The value is sent to box 5.
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5.
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Multiplicative adaptation
The multiplicative adaptation value is also used as a multiplier and the new value sent to box 6.
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6.
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Additive adaptation.
The additive adaptation value is added. If the engine is running the new value is sent via box 7 to box 8.
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7.
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Starting fuel quantity
If the engine still has not started the starting fuel is selected. The value is sent to box 8 via box 7.
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8.
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Fuel mass/combustion to be injected
Fuel mass/combustion is the fuel mass that is to be supplied to the engine. The value is sent to box 9.
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9.
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Injector opening time
Converts the value into the time 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 per combustion
Before the camshaft position has been detected, injection takes place twice/combustion. Injection duration is then divided by two. Current value is sent to box 11.
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11.
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Voltage-dependent needle lift time added
Add the injector duration delay, which is voltage dependent. The value is sent to box 12.
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12.
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Fuel shut-off
If fuel shut-off is not active, the value will be sent to box 13.
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13.
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Activation of injector
At a specific crankshaft angle, the microprocessor controls the transistor for the injector that is next in the firing order.
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