METHOD FOR DETERMINING ENERGY EFFICIENCY OF AN ENERGY SYSTEM IN A HYBRID VEHICLE

摘要

A method for determining the efficiency of an electric energy system of a hybrid vehicle includes determining a measure representative of a relation between the electrical, brake energy and the mechanical brake energy, by determining a requested brake energy for a first vehicle retardation, and by determining an actual electrical brake energy and the actual mechanical brake energy during the vehicle retardation, determining a new measure representative of a relation between the electrical brake energy and the mechanical brake energy at a subsequent second similar vehicle retardation, comparing the determined measures representative of a relation between the electrical brake energy and the mechanical brake energy of the first and second vehicle retardations, where the actual efficiency of the energy system is obtained from the change in the measure representative of a relation between the electrical brake energy and the mechanical brake energy of the first and second vehicle retardations.

主权项

1. A method for determining the efficiency of an electric energy system of a hybrid vehicle comprising a combustion engine, an electric machine, service brakes and an electric storage system, comprising:
determining a requested brake energy for a first vehicle retardation and determining an actual electrical, brake energy in the electric machine of the hybrid vehicle and an actual mechanical brake energy in the service brakes of the hybrid vehicle during the vehicle retardation, determining a measure representative of a relation between the electrical brake energy and the mechanical brake energy, determining a new measure representative of a relation between the electrical brake energy and the mechanical brake energy at a subsequent second similar vehicle retardation, comparing the determined measures representative of a relation between the electrical brake energy and the mechanical brake energy of the first and the second vehicle retardations, where the actual efficiency of the energy system is obtained from the change in the measure representative of a relation between the electrical brake energy and the mechanical brake energy of the first and the second vehicle retardations.