There is one now.amho wrote: ↑Sun Jul 15, 2018 12:18 pmI wish there was a general engine topic where we could interchange our knowledge about engines.
Does any knows how engine load is calculated base on data from TPS، map and engine crank rev sensor? I want the equation which ECU use to calculate load?
Another question is that how automatic gearbox calculate road load?Does it use map sensor numbers or it uses the data of speed, road slope and car weight to find load? what about weight of passengers?
The term "engine load" has many interpretations, but in a tuning sense it is best defined as "engine output as a percentage of maximum output at the current engine speed".
There are very few vehicles where "load" is actually measured. That would require a torque sensor somewhere in the driveline. Load is usually inferred from either MAP or TPS. A knowledge of engine speed is also needed (see the load definition above.) The vehicle maker has full knowledge of the engine characteristics, so if the engine speed and the MAP (or TPS) are known, the load is easy to determine.
Same goes for auto trans. Even before computers were used to control them, they used engine speed and throttle position ("kickdown cable") or manifold vacuum to determine load.