I drive a petrol-powered Renault Grand Scenic III, and it’s not what you’d call overpowered in any way, shape or form. It has a handy display that lets you know when to change up and down, which I thought had to do with how many revs the engine was doing, but I noticed that at comparable speeds, but different inclines, the car wants me to change down when the going gets tough. Which makes sense, but how does it know that it’s struggling? It seems crazy to me that the combustion cycle could be monitored to such a degree.
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There are 3 basic input to the computer in the car (the ECU) that it can use to determine the appropriate time to shift gears. Engine speed (RPM), vehicle speed and throttle position.
There are systems with more complex inputs but generally the above 3 are the basics.
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