I have defined it by defining the transfer function table, as:
Once the transfer function have been fully defined, it is now possible to give some examples.
Example 1: Injection Pulsewidth enlargement
In this case, the XE164 will set EN='1' just before that the real motorbike Injection signal will come (called INJ-in in the above table). In this way, the logic gates will act as a pass gate transferring the INJ-in signal to the output (OUT signal). The MaxPowerCMD power MOS will then drive the injector solenoid to lift the pintle. So, exactly following the motorbike ECU imposed sequene without any delay.
Now XE164 can recognize and sincronize the motorbike intention by acquiring the status of INJ-in signal (INJ-in='1' at Time=1). The XE164 knowns the pulsewith from the previous injection cycle and then it will access the Alpha-N table and retrieve the percentage to enlarge or decrease the current injection pulsewidth. XE164 sets the EN='1' so to be sure that even if the motorbike pulse disappear, the OUT will stay high. At this point the XE164 set-up the related timer designed to drive low the EN signal at the righ time (Time = 5).
All the above is depicted in the following plot, from Time = 0 to Time = 6:
Example 2: Injection Pulsewidth shortening
Similar to the above example 1, whenever XE164 needs to shorten the Injector pulsewidth, it can act as depicted from Time = 7 to 12.
Example 3: Injection Pulsewidth anticipation
Similar to the above example 1, whenever XE164 needs to anticipate the Injector pulsewidth, it can act as depicted from Time = 13 to 18. Please note that this operation can be really dangerous for the engine functionality since it could lead to wrong detonation or other bad sideeffcts.
So, to summarize, the logic gates is needed to change the Injection Pulsewidth:
- EN is used to shortening or postpone it
- ON is used to enlarge or anticipate it
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