Patent ID: 8108094

Claim:
A diagnosis device for an energy transfer system in a vehicle using fuel, comprising: an input energy computation means for determining an input energy of the energy transfer system of the vehicle, the energy transfer system being configured to convert the input energy into an output energy of the energy transfer system through at least two intermediate process energies that are energy transfer mediums at an intermediate process of the energy transfer system; an intermediate process energy computation means for determining the intermediate process energies of the energy transfer system; an output energy computation means for determining the output energy of the energy transfer system; a fuel efficiency anomaly determination use comparing means for comparing the input energy with the output energy to determine whether or not an anomaly occurs in fuel efficiency of the vehicle; an energy transfer anomaly determination use comparing means for comparing the input energy with a first intermediate process energy of the intermediate process energies, comparing the intermediate process energies with each other, and comparing a last intermediate process energy of the intermediate process energies with the output energy, to determine whether or not any anomaly occurs in the energy transfer system; wherein the input energy is chemical energy of the fuel supplied to an internal combustion engine; wherein the output energy is vehicle kinetic energy; and wherein the intermediate process energies are of at least combustion pressure kinetic energy as the first intermediate process energy and brake power kinetic energy as the last intermediate process energy.