| Modelica.SIunits.Volume | VolDisp | | displacement |
| Modelica.SIunits.Volume | Vol1 | | volume, state 1 |
| Modelica.SIunits.Volume | Vol2 | | volume, state 2 |
| Modelica.SIunits.Volume | Vol3 | | volume, state 3 |
| Modelica.SIunits.Volume | Vol4 | | volume, state 4 |
| Modelica.SIunits.SpecificVolume | v1 | | specific volume, state 1 |
| Modelica.SIunits.SpecificVolume | v2 | | specific volume, state 2 |
| Modelica.SIunits.SpecificVolume | v3 | | specific volume, state 3 |
| Modelica.SIunits.SpecificVolume | v4 | | specific volume, state 4 |
| Modelica.SIunits.SpecificEntropy | s_state_1 | | specific entropy, state 1 |
| Modelica.SIunits.SpecificEntropy | s_state_2 | | specific entropy, state 2 |
| Modelica.SIunits.SpecificEntropy | s_state_3 | | specific entropy, state 3 |
| Modelica.SIunits.SpecificEntropy | s_state_4 | | specific entropy, state 4 |
| Modelica.SIunits.Mass | massFluidCycle | | mass of fluid in single cycle in cylinder |
| Modelica.SIunits.Mass | massFuelCycle | | mass of fuel in single cycle in cylinder |
| Modelica.SIunits.Heat | Q_2_3 | | heat injected into fluid by combustion |
| Modelica.SIunits.Heat | Q_4_1 | | heat rejected from fluid by exhaust |
| Modelica.SIunits.Work | WoutCycle | | work output, single cycle |
| Modelica.SIunits.Work | W_1_2 | | work, compression, state 1 -> 2 |
| Modelica.SIunits.Work | W_2_3 | | work, expansion, state 2 -> 3 |
| Modelica.SIunits.Work | W_3_4 | | work, expansion, state 3 -> 4 |
| Modelica.SIunits.SpecificEnergy | WqmOutCycle | | WoutCycle/mass |
| Modelica.SIunits.SpecificEnergy | Wqm_1_2 | | W_1_2/mass |
| Modelica.SIunits.SpecificEnergy | Wqm_2_3 | | W_2_3/mass |
| Modelica.SIunits.SpecificEnergy | Wqm_3_4 | | W_3_4/mass |
| Modelica.SIunits.SpecificEnergy | Qqm_2_3 | | Q_2_3/mass |
| Modelica.SIunits.SpecificEnergy | Qqm_4_1 | | Q_4_1/mass |
| Real | CR | | Compression Ratio |
| Real | ER_2_3 | | Expansion Ratio, state 2 -> 3 |
| Real | ER_3_4 | | Expansion Ratio, state 3 -> 4 |
| Real | fracFuel | | Fraction of fuel in fluid |
| Real | effThermal | | Thermal efficiency |
| Modelica.SIunits.SpecificEnthalpy[5] | arr_h | | |
| Modelica.SIunits.SpecificEnergy[5] | arr_u | | |
| Modelica.SIunits.SpecificEntropy[5] | arr_s | | |
| Modelica.SIunits.Pressure[5] | arr_p | | |
| Modelica.SIunits.Volume[5] | arr_V | | |
| Modelica.SIunits.SpecificVolume[5] | arr_v | | |
| Modelica.SIunits.Temperature[5] | arr_T | | |
| Real | alpha | | cutoff ratio, v3/v2 |
| Modelica.SIunits.Pressure | pme | | mean effective pressure of cycle |
| Boolean | flag_Wexp_gt_Q23 | | flag, true if |Q_2_3|<|W_2_3+W_3_4| |
| Modelica.SIunits.SpecificEnthalpy | dh_1_2 | | |
| Modelica.SIunits.SpecificEnthalpy | dh_2_3 | | |
| Modelica.SIunits.SpecificEnthalpy | dh_3_4 | | |
| Modelica.SIunits.SpecificEnthalpy | dh_4_1 | | |
| Modelica.SIunits.TemperatureDifference | dT_1_2 | | |
| Modelica.SIunits.TemperatureDifference | dT_2_3 | | |
| Modelica.SIunits.TemperatureDifference | dT_3_4 | | |
| Modelica.SIunits.TemperatureDifference | dT_4_1 | | |
| Medium.BaseProperties | fluidState_1 | | fluid state 1 |
| Medium.BaseProperties | fluidState_2 | | fluid state 2 |
| Medium.BaseProperties | fluidState_3 | | fluid state 3 |
| Medium.BaseProperties | fluidState_4 | | fluid state 4 |