USRE47527EActiveUtility
System and method for calculating distance to empty of green vehicle
Est. expirySep 28, 2032(~6.2 yrs left)· nominal 20-yr term from priority
Y02T10/705B60L 2240/545Y02T10/7044B60L 11/1861B60L 2250/16B60L 2260/54Y02T10/7005B60L 2240/549B60L 2260/52B60L 2240/547Y02T10/70B60L 58/12
48
PatentIndex Score
0
Cited by
30
References
11
Claims
Abstract
Disclosed is a system and method for computing distance to empty (DTE) based on available energy computed using a battery SOC vs open circuit voltage (OCV) table, battery temperature vs energy efficiency, an energy efficiency vs energy table, etc., to enable a more accurate calculation of the DTE in consideration of the temperature of the battery, which is one of disturbance elements.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. 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 from a battery SOC versus open circuit voltage (OCV) table; and
computing energy efficiency of the battery by substituting current and the extracted open circuit voltage and current in:
Energy
efficiency
(
η
)
=
(
1
-
∫
i
·
(
v
t
-
v
e
)
dt
∫
i
·
v
i
dt
+
∫
i
·
v
e
dt
)
·
100
[
]
Energy
efficiency
(
η
)
=
(
1
-
∫
i
·
(
v
t
-
v
e
)
dt
∫
i
·
v
t
dt
+
∫
i
·
v
e
dt
)
·
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.
2. The method of claim 1 , wherein, in the estimating of the SOC, the estimated current SOC is stored in an SOC memory so as to be used in the computation of the current available energy.
3. The method of claim 1 , wherein the energy efficiency (η) is computed by measuring a temperature of a battery in a non-load state in which the battery is discharged; and extracting energy efficiency corresponding to the measured temperature of the battery by substituting the measured temperature of the battery in a battery temperature vs energy efficiency table.
4. The method of claim 1 , wherein the available energy is computed by substituting the energy efficiency of the battery in the energy efficiency vs energy table, thereby extracting the available energy when the state of charge (SOC) is 100% (E @SOC=100% ); and the energy efficiency (η) of the battery, the available energy when the state of charge (SOC) is 100% (E @SOC=100% ), extracted from the SOC memory, and the information on real-time SOC (%) in:
Available
energy
=
E
@
SOC
=
100
%
η
{
SOC
-
(
100
-
η
)
}
.
5. The method of claim 1 , wherein the DTE is computed by a multiplication of battery-electric efficiency (km/kwh) and available energy.
6. A non-transitory computer readable medium containing program instructions executed by a processor or controller, the computer readable medium comprising:
program instructions that compute 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 (%);
program instructions that compute DTE based on the computed available energy; and
program instructions that display the computed DTE in a cluster,
wherein the energy efficiency (η) 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 from a battery SOC vs open circuit voltage (OCV) table; and computing energy efficiency of the battery by substituting current and the extracted open circuit voltage and current in:
[
Energy
efficiency
(
η
)
]
=
(
1
-
∫
i
·
(
v
t
-
v
e
)
dt
∫
i
·
v
i
dt
+
∫
i
·
v
e
dt
)
·
100
Energy
efficiency
(
η
)
=
(
1
-
∫
i
·
(
v
t
-
v
e
)
dt
∫
i
·
v
t
dt
+
∫
i
·
v
e
dt
)
·
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.
7. The non-transitory computer readable medium of claim 6 , wherein, in the estimating of the SOC, the estimated current SOC is stored in an SOC memory so as to be used in the computation of the current available energy.
8. The non-transitory computer readable medium of claim 6 , wherein the energy efficiency (η) is computed by measuring a temperature of a battery in a non-load state in which the battery is discharged; and extracting energy efficiency corresponding to the measured temperature of the battery by substituting the measured temperature of the battery in a battery temperature vs energy efficiency table.
9. The non-transitory computer readable medium of claim 6 , wherein the available energy is computed by substituting the energy efficiency of the battery in the energy efficiency vs energy table, thereby extracting the available energy when the state of charge (SOC) is 100% (E @SOC=100% ); and the energy efficiency (η) of the battery, the available energy when the state of charge (SOC) is 100% (E @SOC=100% ), extracted from the SOC memory, and the information on real-time SOC (%) in:
Available
energy
=
E
@
SOC
=
100
%
η
{
SOC
-
(
100
-
η
)
}
.
10. The non-transitory computer readable medium of claim 6 , wherein the DTE is computed by a multiplication of battery-electric efficiency (km/kwh) and available energy.
11. The method for distance to empty (DTE) computation of a green vehicle of claim 1, wherein the available energy is expressed as a function using temperature, degradation, state of charge (SOC) of the battery as variable factors.Cited by (0)
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