Patent ID: 8862375

Claim:
A method for distance to empty (DTE) computation of a green vehicle, the method comprising: computing, by a controller, a current available energy of a battery, based on energy efficiency (η) of the battery, available energy when the state of charge (SOC) is 100% (E @SOC=100% ) extracted from an energy efficiency vs energy table, and information on real-time SOC (%); computing, by the controller, DTE based on the computed available energy; and displaying, on a display, the computed DTE in a cluster, wherein the energy efficiency is computed by: estimating an SOC in a load state in which the battery is discharged; extracting open circuit voltage and current corresponding to the current SOC estimated form a battery SOC versus open circuit voltage (OCV) table; and computing energy efficiency of the battery by substituting the extracted open circuit voltage and current in: Energy ⁢ ⁢ efficiency ⁢ ⁢ ( η ) = ( 1 - ∫  i · ( v t - v e )  ⁢ ⅆ t ∫  i · v i  ⁢ ⅆ t + ∫  i · v e  ⁢ ⅆ t ) · 100. wherein i denotes current, V t denotes a terminal voltage of the battery, V e denotes an open circuit voltage of the battery, ∫|i·v t |dt and ∫|i·v e |dt denote charging and discharging energy, and ∫|i·(v t −v e )|dt denotes heat loss energy generated when the battery is charged and discharged.