Fuel Injection, Basic Function

Fuel Injection, Basic Function

1 Basic calculation of fuel mass/combustion
The current mass air flow/combustion is divided by 14.7 and sent to box 2. The unit is now mg fuel/combustion.

2 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.

3 Closed loop
The closed loop control system value is also used as a multiplier. The value is sent to box 4.

4 Correction for purging
Multiply by the value for purging adaptation. The value is sent to box 5.

5 Multiplicative adaptation
The multiplicative adaptation value is also used as a multiplier and the new value sent to box 6.

6 Additive adaptation
The additive adaptation value is added and the new value sent to box 7.

7 Starting fuel quantity
If the engine has not yet started, starting fuel is selected. The value is sent to box 7.





8 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.

9 Injector opening duration
Converts the value into the time the injector must be open and the new value is sent to box 10.

10 Injection twice/combustion
Before the camshaft position is found, injection takes place twice per combustion. The injection duration is then divided by two. The current value is sent to box 11.

11 Voltage-dependent needle lift time added
Add the injector's time delay which is voltage-dependent. The value is sent to box 12.

12 Fuel shut-off
If fuel shut-off is not active, the value will be sent to box 13.

13 Activation of injector
At a specific crankshaft angle, the microprocessor controls the transistor for the injector which is next in the firing order.