Mean effective pressure

The medium pressure is an operand to assess the efficiency and the gas exchange of reciprocating engines regardless of engine capacity or size of the engine. Simplifies the accelerator pedal in the vehicle can be considered as an actuator for the medium pressure.

We distinguish several mean pressures:

  • The mean effective pressure can be calculated from the output torque and the votes at a working clock work:
  • The indicated mean effective pressure is equal to the indicated work (see working volume ), based on the stroke volume:
  • The friction mean effective pressure as a differential pressure with the above two means as a measure of all the mechanical losses:

If one plots the mean effective pressure over the specific fuel consumption as a function of the air ratio of the engine, so you get the fish hook curve for gasoline engines.