Engine measurement device

An engine measurement device for measuring engine performance by bench testing an automobile engine having an external driving means connected to said engine, said engine measurement device comprising:

• an engine control unit for controlling a throttle travel of said engine;
• an external driving means control unit for controlling said external driving means;
• a detector for measuring time series data that include at least an engine speed of said engine and an axial torque detected between said engine and the external driving means in a transient state, in a non-combustion drive state in which said external driving means is driven by the control of said engine control unit and the external driving means control unit;
• a torque computation unit for computing an engine torque that is an actual drive force of said engine as a mechanical loss torque that occurs during said non-combustion driving, on a basis of the time series data of said engine speed and axial torque;
• and
• a model computation unit for modeling said mechanical loss torque using a model and engine parameters including said engine speed, an engine oil temperature, and an intake air quantity;
• wherein
• said mechanical loss torque is computed from said model for each of said engine parameters.

An engine measurement device for measuring engine performance by bench testing an automobile engine having a load connected to said engine and an external driving means connected to said engine, said engine measurement device comprising:

• a first engine control unit for controlling a fuel injection timing of said engine;
• a second engine control unit for controlling a throttle travel of said engine;
• an external driving means control unit for controlling said external driving means;
• a detector for measuring time series data that include at least:
• an engine speed of said engine;
• an axial torque detected between said engine and a load in a transient state, in a state in which said engine is combustion-driven by the control of said engine control unit;
• and
• an axial torque detected between said engine and the external driving means in a transient state, in a non-combustion drive state in which said external driving means is driven by the control of said engine control unit and the external driving means control unit;
• a first torque computation unit for computing a first engine torque on a basis of the time series data of said engine speed and axial torque;
• a second torque computation unit for computing an second engine torque as a mechanical loss torque that occurs during said non-combustion driving, on a basis of the time series data of said engine speed and axial torque;
• a first model computation unit for modeling said first engine torque using a first model and engine parameters including said engine speed, and said fuel injection timing, wherein a fuel torque generated by the combustion driving of said engine, and a first mechanical loss torque Tm that is a difference between said first engine torque and said fuel torque are calculated from said model;
• a second model computation unit for modeling said mechanical loss torque using a second model and engine parameters including said engine speed, an engine oil temperature, and an intake air quantity, wherein a second mechanical loss torque Tmm is computed from said second model for each of said engine parameters;
• and
• a comparing unit for comparing the first mechanical loss torque Tm computed by the first model computation unit and the second mechanical loss torque Tmm computed by the second model computation unit to verify validity and consistency of the first and second mechanical loss torques.