FrozenJakalope Posted April 23, 2015 Share Posted April 23, 2015 How exactly is the engine speed controlled in a 4e? Not in the sense that, I press the throttle and the revs pick up, but more how do they pick up? Is it the TPS telling the ECU to increase fuelling, or is it airflow dependant? Or something else entirely? Quote Link to post Share on other sites
AdamB Posted April 23, 2015 Share Posted April 23, 2015 When you open the throttle, the TPS changes voltage, the MAP sensor picks up the air pressure, the air intake temp sensor picks up the temp, the ecu calculates the air's density. Since you've opened the throttle, more air is coming in, and the ecu goes to what's known as a look up table which is programmed, it sees what the pressure and temp is, picks a value of injector duty to match the air-fuel ratio it's been programmed for and speed increases. That's the general jist of it, it is more complex than that with coolant temp, knock sensor, ignition timing etc etc. Quote Link to post Share on other sites
FrozenJakalope Posted April 23, 2015 Author Share Posted April 23, 2015 Ahh, I see. Cheers, that's helped a lot Quote Link to post Share on other sites
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