I’d like to share the page :  https://carfromjapan.com/article/car-maintenance/types-of-sensors-used-in-automobile-engine/

The writer divided Engine sensor as below table:

STT Sensor Main Function
1  The Mass Air Flow Sensor Calculates the density and the volume of the air taken in by the engine
2  The Engine Speed Sensor Monitors the spinning speed of the crankshaft
3 Oxygen Sensor Measures the amount of unburden oxygen presented in the exhaust pipe
4 Manifold Absolute Pressure Sensor Measures the manifold pressure inside and outside
5 Spark Knock Sensor  Ensures that the fuel is burned correctly
6  Fuel Temperature Sensor Ensures the right amount of fuel is injected to keep the motion smoothly
7  Voltage Sensor Manages the car speed and ensures the speed is controllable

But it’s a bit different to identify the part.
I don’t understand what the Spark Knock Sensor and Voltage Sensor.
I heard/saw Knock sensor many times, but not Spark knock sensor. Both are the same?

And I’m always wondering if oil control valve,  purge control valve, solenoid valve are in Engine sensor category.
And how about an idle speed actuator? Is it sensor or motor?