Abstract: A programmable processor receives engine speed data for an engine. The programmable processor calculates a work corresponding to a component of the engine. The calculated work is based on a change in the engine speed data over a range. A predicted work value is read from a table based on an engine speed and first metric. A value is transmitted to a control system when the calculated work is not the predicted work value. The value, when implemented by the control system, reduces a difference between the predicted work value and the calculated work for the component.

Abstract: An opposed piston internal combustion engine can include two opposed pistons (104, 110) moving reciprocally along respective axes of translation (202, 204) that are not collinear. First and second cylinder bores (502, 504) can be inclined to each other at an included angle (a). A combustion volume or chamber (114) can optionally be defined at least in part by crowns (102, 106) of the first and second pistons (104, 110) reciprocating in the first and second cylinder bores (502, 504), respectively. Related methods, systems, and articles of manufacture are described.