Patent US5422822A successfully refreshed from Google Patents.
US5422822A
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US
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Apparatus for detecting remanent stored energy in storage battery and apparatus for warning of reduction in remanent stored energy in storage battery
Assignee: Honda Motor Co Ltd
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Filing: 1992-06-18
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Granted: 1995-06-06
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Expires: 2012-06-18
Abstract
Abstract A reference amount of consumed energy of a storage battery on an electric-powered vehicle is calculated by adding values of a discharging current of the storage battery which are detected at predetermined time intervals since the storage battery was fully charged. The reference amount of consumed energy is corrected, i.e., multiplied, by consumed-energy corrective coefficients based on the battery temperature, the discharging current, the battery voltage, and the specific gravity of the storage battery, thereby determining an amount of consumed electric energy. A reference amount of remanent stored energy of the storage battery is determined by deducting the determined amount of consumed electric energy from an initial amount of stored energy of the storage battery. The reference amount of remanent stored energy is then corrected, i.e., multiplied, by remanent-energy corrective coefficients based on the ratio of amounts of charged and discharged energy, the number of times that the storage battery has been charged, and the battery temperature.
Inventors
- 👤 Hideki Toyota
- 👤 Takahiro Iwata
- 👤 Isao Hyugaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:34
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/36; G01R31/3644; G01R31/3648; B; B60; B60L; B60L3/00; B60L3/0023; B60L3/0046; B60L53/00; B60L53/10; B60L53/14; G01R31/374; G01R31/382; B60L2240/00; B60L2240/40; B60L2240/54; B60L2240/545; B60L2240/547; B60L2240/549; B60L2250/00; B60L2250/10; G01R31/005; G01R31/006; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y02T10/7072; Y02T90/00; Y02T90/10; Y02T90/14
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
399 words
An apparatus for detecting the remanent stored energy in a storage battery, comprising: current detecting means for detecting discharging and charging currents of the storage battery; temperature detecting means for detecting a temperature of the storage battery; counting means for detecting the number of times that the storage battery has been charged to capacity; discharging current summing means for adding values of the discharged current of the storage battery as detected by said current detecting means at predetermined time intervals since the storage battery was fully charged, and for storing in memory the added values as a reference amount of consumed energy of the storage battery; consumed energy calculating means for multiplying said reference amount of said consumed energy at a preset time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the present time, thereby determining an amount of consumed electric energy of the storage battery; subtracting means for subtracting the amount of consumed electric energy determined by said consumed energy calculating means from an initial amount of stored energy of the storage battery, thereby determining the difference as a reference remanent stored energy of the storage battery; charging current adding means for adding values of the charging current of the storage battery as detected by said current detecting means at predetermined time intervals when the storage battery is charged, and for storing the added values as an amount of charged energy of the storage battery; processing means for determining, as a first remanent-energy corrective coefficient, the ratio of said reference amount of consumed energy which has been stored by said discharging current adding means immediately before the storage battery was last charged and said amount of charged energy which has been stored by said charging current adding means when the last charging of the storage battery was completed; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy stored by said subtracting means, by said first remanent-energy corrective coefficient and a second remanent-energy corrective coefficient which is predetermined depending on the total number of times that the storage battery has been charged as detected by said counting means and the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged.
Claim 2
Independent Claim
399 words
An apparatus for detecting the remanent stored energy in a storage battery, comprising: current detecting means for detecting discharging and charging currents of the storage battery; temperature detecting means for detecting a temperature of the storage battery; counting means for detecting the number of times that the storage battery has been charged to capacity; discharging current summing means for adding values of the discharged current of the storage battery as detected by said current detecting means at predetermined time intervals since the storage battery was fully charged, and for storing in memory the added values as a reference amount of consumed energy of the storage battery; consumed energy calculating means for multiplying said reference amount of said consumed energy at a preset time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the present time, thereby determining an amount of consumed electric energy of the storage battery; subtracting means for subtracting the amount of consumed electric energy determined by said consumed energy calculating means from an initial amount of stored energy of the storage battery, thereby determining the difference as a reference remanent stored energy of the storage battery; charging current adding means for adding values of the charging current of the storage battery as detected by said current detecting means at predetermined time intervals when the storage battery is charged, and for storing the added values as an amount of charged energy of the storage battery; processing means for determining, as a first remanent-energy corrective coefficient, the ratio of said reference amount of consumed energy which has been stored by said discharging current adding means immediately before the storage battery was last charged and said amount of charged energy which has been stored by said charging current adding means when the last charging of the storage battery was completed; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy stored by said subtracting means, by said first remanent-energy corrective coefficient and a second remanent-energy corrective coefficient which is predetermined depending on the total number of times that the storage battery has been charged as detected by said counting means and the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged.
Claim 3
Dependent Claim
66 words
An apparatus according to claim 1, further including connection detecting means for detecting whether a battery charger is connected to the storage battery or not, said counting means comprising means for detecting the number of times that the storage battery has been charged as the number of times that said battery charger has been connected to the storage battery as detected by said connection detecting means.
Claim 4
Dependent Claim
70 words
An apparatus according to claim 1, further including voltage detecting means for detecting a voltage across the storage battery, said discharging current adding means comprising means for starting to add values of the discharging current when the voltage detected by said voltage detecting means is equal to or higher than a predetermined voltage corresponding to a fully charged condition of the storage battery while the storage battery is being charged.
Claim 5
Dependent Claim
41 words
An apparatus according to claim 1, wherein said discharging current adding means comprises means for adding values of the discharging current when the discharging current as detected by said current detecting means is equal to or higher than a predetermined current.
Claim 6
Dependent Claim
26 words
An apparatus according to claim 1, wherein said consumed-energy coefficient is of a value which is larger as the temperature of the storage battery goes higher.
Claim 7
Dependent Claim
64 words
An apparatus according to claim 5, wherein said consumed energy calculating means comprising means for multiplying said reference amount of consumed energy by said first consumed-energy corrective coefficient and a second consumed-energy corrective coefficient which varies depending on the discharging current of the storage battery as detected by said current detecting means at the present time, thus determining said amount of consumed electric energy.
Claim 8
Dependent Claim
28 words
An apparatus according to claim 6, wherein said second consumed-energy coefficient is of a value which is larger as the discharging current of the storage battery becomes larger.
Claim 9
Dependent Claim
28 words
An apparatus according to claim 1, wherein said initial amount of stored energy of the storage battery is equal to a rated storage capacity of the storage battery.
Claim 10
Dependent Claim
40 words
An apparatus according to claim 1, wherein said initial amount of stored energy of the storage battery is of a value which is reduced stepwise depending on a period of time that elapses since the storage battery was first used.
Claim 11
Dependent Claim
99 words
An apparatus according to claim 1, further including connection detecting means for detecting whether a battery charger is connected to the storage battery or not, and voltage detecting means for detecting a voltage across the storage battery, said charging current adding means comprising means for adding values of the charging current as detected by said current detecting means after the battery charger is connected to the storage battery as detected by said connection detecting means until the voltage as detected by said voltage detecting means reaches a predetermined voltage corresponding to a fully charged condition of the storage battery.
Claim 12
Dependent Claim
49 words
An apparatus according to claim 1, wherein said second remanent-energy corrective coefficient is determined depending on the total number of times that the storage battery has been charged and the temperature of the storage battery as detected by said temperature detecting means when the storage battery starts being charged.
Claim 13
Dependent Claim
62 words
An apparatus according to claim 11, wherein said second remanent-energy corrective coefficient is of a value which is smaller as the number of times that the storage battery has been charged is larger, larger as the temperature of the storage battery goes higher below a predetermined temperature, and smaller as the temperature of the storage battery goes higher beyond said predetermined temperature.
Claim 14
Dependent Claim
84 words
An apparatus according to claim 1, wherein said consumed energy calculating means comprises means for multiplying said reference amount of consumed energy by said first consumed-energy corrective coefficient and a third consumed-energy corrective coefficient which is predetermined depending on the discharging current as detected by said current detecting means at the present time and a period of time during which the detected discharging current is continuously maintained at a constant level up to the present time, thereby determining said amount of consumed electric energy.
Claim 15
Dependent Claim
139 words
An apparatus according to claim 13, wherein said discharging current adding means includes memory means for storing a plurality of detected values of the discharging current in a time series at predetermined time intervals retrospectively up to the present time, said consumed energy calculating means comprising means for comparing the values of the discharging current which are stored in said memory means, successively retrospectively from the present time, with the detected value of the discharging current at the present time, determining the period of time during which the detected value of the discharging current at the present time is continuously maintained at the constant level up to the present time, and determining said second consumed-energy corrective coefficient depending on the determined period of time and the discharging current as detected by said current detecting means at the present time.
Claim 16
Dependent Claim
41 words
An apparatus according to claim 14, wherein said third consumed-energy corrective coefficient is of a value which is larger as the discharging current of the storage battery is larger and which is larger as the determined period of time is longer.
Claim 17
Dependent Claim
133 words
An apparatus according to claim 13, further including voltage detecting means for detecting a voltage across the storage battery, and specific gravity detecting means for detecting a specific gravity of the storage battery, said consumed energy calculating means comprising means for multiplying said reference amount of consumed energy which is stored by said discharging current adding means at the present time, by said first consumed-energy corrective coefficient, said third consumed-energy corrective coefficient, a fourth consumed-energy corrective coefficient which is predetermined depending on the voltage as detected by said voltage detecting means at the present time, and a fifth consumed-energy corrective coefficient which is predetermined depending on the specific gravity of the storage battery as detected by said specific gravity detecting means at the present time, thereby determining said amount of consumed electric energy.
Claim 18
Dependent Claim
28 words
An apparatus according to claim 16, wherein said fourth consumed-energy corrective coefficient is of a value which is larger as the voltage across the storage battery is lower.
Claim 19
Dependent Claim
29 words
An apparatus according to claim 16, wherein said fifth consumed-energy corrective coefficient is of a value which is larger as the specific gravity of the storage battery is lower.
Claim 20
Dependent Claim
33 words
An apparatus according to claim 1, further including warning means for generating a warning when said remanent stored energy as calculated by said remanent energy calculating means is smaller than a predetermined level.
Claim 21
Dependent Claim
49 words
An apparatus according to claim 1, wherein said discharging current adding means comprises means for adding values of the discharging current as detected by said current detecting means is equal to or higher than a predetermined current, said predetermined current corresponding to the current required to operate the apparatus.
Claim 22
Dependent Claim
60 words
An apparatus according to claim 1, wherein said discharging current adding means comprises means for adding values of the discharging current as detected by said current detecting means is equal to or higher than a predetermined current, said predetermined current corresponding to the current required to operate accessory loads not substantially affecting the remanent stored energy of the storage battery.
Claim 23
Independent Claim
134 words
An apparatus for warning of a reduction in the remanent stored energy of a storage battery installed as a power source on an electric-powered vehicle, comprising: remanent energy detecting means for detecting the remanent stored energy of the storage battery; switch opening/closing detecting means for detecting whether a main switch of the electric-powered vehicle is turned on or off; door opening/closing detecting means for detecting whether a door of the electric-powered vehicle is open or closed; and warning controlling means for producing a warning sound if said remanent stored energy of the storage battery as detected by said remanent energy detecting means is smaller than a predetermined level when said main switch is turned off as detected by said switch opening/closing means, and said door is open as detected by said door opening/closing means.
Claim 24
Independent Claim
134 words
An apparatus for warning of a reduction in the remanent stored energy of a storage battery installed as a power source on an electric-powered vehicle, comprising: remanent energy detecting means for detecting the remanent stored energy of the storage battery; switch opening/closing detecting means for detecting whether a main switch of the electric-powered vehicle is turned on or off; door opening/closing detecting means for detecting whether a door of the electric-powered vehicle is open or closed; and warning controlling means for producing a warning sound if said remanent stored energy of the storage battery as detected by said remanent energy detecting means is smaller than a predetermined level when said main switch is turned off as detected by said switch opening/closing means, and said door is open as detected by said door opening/closing means.
Claim 25
Dependent Claim
24 words
An apparatus according to claim 22, wherein said warning controlling means comprises means for producing a warning sound for a predetermined period of time.
Claim 26
Dependent Claim
100 words
An apparatus according to claim 22, wherein door locking detecting means for detecting whether said door is locked are provided and said warning controlling means comprises means for producing a warning sound also if said remanent stored energy of the storage battery as detected by said remanent energy detecting means is smaller than a predetermined level when said main switch is turned off as detected by said switch opening/closing means, said door is open as detected by said door opening/closing means, and said door is locked as detected by said door locking detecting means after said door has been opened.
Claim 27
Dependent Claim
143 words
An apparatus according to claim 24, wherein said warning sound produced by said warning controlling means if said remanent stored energy of the storage battery as detected by said remanent energy detecting means is smaller than said predetermined level when said main switch is turned off as detected by said switch opening/closing means, said door is open as detected by said door opening/closing means, said door is locked as detected by said door locking detecting means after said door has been opened, is louder than said warning sound produced by said warning controlling means if said remanent stored energy of the storage battery as detected by said remanent energy detecting means is smaller than a predetermined level when said main switch is turned off as detected by said switch opening/closing means, and said door is open as detected by said door opening/closing means.
Claim 28
Dependent Claim
41 words
An apparatus according to claim 22, wherein said warning controlling means includes means for generating an optical warning if said remanent stored energy of the storage battery as detected by said remanent energy detecting means is smaller than a predetermined level.
Claim 29
Dependent Claim
33 words
An apparatus according to claim 22, wherein said warning controlling means comprises means for stopping said warning sound when the storage battery is being charged while said main switch is being turned off.
Claim 30
Independent Claim
193 words
An apparatus for detecting the remanent stored energy in a storage battery, comprising: temperature detecting means for detecting a temperature of the storage battery; means for determining a reference amount of consumed energy of the storage battery; and consumed energy calculating means for multiplying said reference amount of consumed energy at a present time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the present time, thereby determining an amount of consumed electric energy of the storage battery; and subtracting means for subtracting the amount of consumed electric energy determined by said consumed energy calculating means from an initial amount of stored energy of the storage battery, thereby determining the difference as reference remanent stored energy of the storage battery; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy calculated by said subtracting means by a remanent-energy corrective coefficient which is predetermined depending on the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged.
Claim 31
Independent Claim
193 words
An apparatus for detecting the remanent stored energy in a storage battery, comprising: temperature detecting means for detecting a temperature of the storage battery; means for determining a reference amount of consumed energy of the storage battery; and consumed energy calculating means for multiplying said reference amount of consumed energy at a present time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the present time, thereby determining an amount of consumed electric energy of the storage battery; and subtracting means for subtracting the amount of consumed electric energy determined by said consumed energy calculating means from an initial amount of stored energy of the storage battery, thereby determining the difference as reference remanent stored energy of the storage battery; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy calculated by said subtracting means by a remanent-energy corrective coefficient which is predetermined depending on the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged.
Claim 32
Dependent Claim
88 words
An apparatus according to claim 28, further including current detecting means for detecting discharging and changing currents of the storage battery and wherein said means for determining a reference amount of consumed energy of the storage battery includes discharging current adding means for adding values of the discharging current of the storage battery as detected by said current detecting means at predetermined time intervals since the storage battery was fully charged and the storing the added values as said reference amount of consumed energy of the storage battery.
Claim 33
Dependent Claim
56 words
An apparatus according to claim 29, further including charging current adding means for adding values of the charging current of the storage battery as detected by said current detecting means at predetermined time intervals when the storage battery is charged, and for storing the added values as an amount of charged energy of the storage battery.
Claim 34
Dependent Claim
105 words
An apparatus according to claim 30, further including means for determining a reference remanent stored energy; processing means for determining, as a remanent-energy corrective coefficient, the ratio of said reference amount of consumed energy which has been stored by said discharging current adding means immediately before the storage battery was last charged and said amount of charged energy which has been stored by said charging current adding means when the last charging of the storage battery was completed; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy by said remanent-energy corrective coefficient.
Claim 35
Independent Claim
99 words
An apparatus according to claims 30, further including connection detecting means for detecting whether a battery charger is connected to the storage battery or not, and voltage detecting means for detecting a voltage across the storage battery, said charging current adding means comprising means for adding values of the charging current as detected by said current detecting means after the battery charger is connected to the storage battery as detected by said connection detecting means until the voltage as detected by said voltage detecting means reaches a predetermined voltage corresponding to a fully charged condition of the storage battery.
Claim 36
Dependent Claim
41 words
An apparatus according to claim 29, wherein said discharging current adding means comprises means for adding values of the discharging current when the discharging current as detected by said current detecting means is equal to or higher than a predetermined current.
Claim 37
Dependent Claim
106 words
An apparatus according to claim 28, further including counting means for detecting the number of times that the storage battery has been charged; means for determining a reference remanent stored energy of the storage battery; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy by a remanent-energy corrective coefficient which is predetermined depending on the total number of times that the storage battery has been charged as detected by said counting means and the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged.
Claim 38
Dependent Claim
66 words
An apparatus according to claim 34, further including connection detecting means for detecting whether a battery charger is connected to the storage battery or not, said counting means comprising means for detecting the number of times that the storage battery has been charged as the number of times that said battery charger has been connected to the storage battery as detected by said connection detecting means.
Claim 39
Dependent Claim
75 words
An apparatus according to claim 28, further including voltage detecting means for detecting a voltage across the storage battery, said means for determining a reference amount of consumed energy including means for starting to add values of the discharging current when the voltage detected by said voltage detecting means is equal to or higher than a predetermined voltage corresponding to a fully charged condition of the storage battery while the storage battery is being charged.
Claim 40
Independent Claim
532 words
An apparatus for detecting the remanent stored energy in a storage battery installed as a power source on an electric powered vehicle comprising: current detecting means for detecting discharging and charging currents of the storage battery; temperature detecting means for detecting a temperature of the storage battery; counting means for detecting the number of times that the storage battery has been charged to capacity; discharging current summing means for adding values of the discharged current of the storage battery as detected by said current detecting means at predetermined time intervals since the storage battery was fully charged, and for storing in memory the added values as a reference amount of consumed energy of the storage battery; consumed energy calculating means for multiplying said reference amount of said consumed energy at a preset time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the preset time, thereby determining an amount of consumed electric energy of the storage battery; subtracting means for subtracting the amount of consumed electric energy determined by said consumed energy calculating means from an initial amount of stored energy of the storage battery, thereby determining the difference as a reference remanent stored energy of the storage battery; charging current adding means for adding values of the charging current of the storage battery as detected by said current detecting means at predetermined time intervals when the storage battery is charged, and for storing in memory the added values as an amount of charged energy of the storage battery; processing means for determining, as a first remanent-energy corrective coefficient, the ratio of said reference amount of consumed energy which has been stored by said discharging current adding means immediately before the storage battery was last charged and said amount of charged energy which has been stored by said charging current adding means when the last charging of the storage battery was completed; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy stored by said subtracting means, by said first remanent-energy corrective coefficient which is predetermined depending on the total number of times that the storage battery has been charged as detected by said counting means and the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged; and switch opening/closing detecting means for detecting whether a main switch of the electric-powered vehicle is turned on or off; and door opening/closing detecting means for detecting whether a door of the electric-powered vehicle is open or closed; door locking detecting means for detecting whether said door is locked or not; and warning controlling means for producing a warning sound if said remanent stored energy of the storage battery as calculated by said remanent energy calculating means is smaller than a predetermined level when said main switch is turned off as detected by said switch opening/closing means, said door is open as detected by said door opening/closing means, and said door is locked as detected by said door locking detecting means after said door has been opened.
Claim 41
Independent Claim
532 words
An apparatus for detecting the remanent stored energy in a storage battery installed as a power source on an electric powered vehicle comprising: current detecting means for detecting discharging and charging currents of the storage battery; temperature detecting means for detecting a temperature of the storage battery; counting means for detecting the number of times that the storage battery has been charged to capacity; discharging current summing means for adding values of the discharged current of the storage battery as detected by said current detecting means at predetermined time intervals since the storage battery was fully charged, and for storing in memory the added values as a reference amount of consumed energy of the storage battery; consumed energy calculating means for multiplying said reference amount of said consumed energy at a preset time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the preset time, thereby determining an amount of consumed electric energy of the storage battery; subtracting means for subtracting the amount of consumed electric energy determined by said consumed energy calculating means from an initial amount of stored energy of the storage battery, thereby determining the difference as a reference remanent stored energy of the storage battery; charging current adding means for adding values of the charging current of the storage battery as detected by said current detecting means at predetermined time intervals when the storage battery is charged, and for storing in memory the added values as an amount of charged energy of the storage battery; processing means for determining, as a first remanent-energy corrective coefficient, the ratio of said reference amount of consumed energy which has been stored by said discharging current adding means immediately before the storage battery was last charged and said amount of charged energy which has been stored by said charging current adding means when the last charging of the storage battery was completed; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying said reference remanent stored energy stored by said subtracting means, by said first remanent-energy corrective coefficient which is predetermined depending on the total number of times that the storage battery has been charged as detected by said counting means and the temperature of the storage battery as detected by said temperature detecting means when the storage battery was last charged; and switch opening/closing detecting means for detecting whether a main switch of the electric-powered vehicle is turned on or off; and door opening/closing detecting means for detecting whether a door of the electric-powered vehicle is open or closed; door locking detecting means for detecting whether said door is locked or not; and warning controlling means for producing a warning sound if said remanent stored energy of the storage battery as calculated by said remanent energy calculating means is smaller than a predetermined level when said main switch is turned off as detected by said switch opening/closing means, said door is open as detected by said door opening/closing means, and said door is locked as detected by said door locking detecting means after said door has been opened.
Claim 42
Independent Claim
146 words
An apparatus for detecting the remanent stored energy in a storage battery, comprising: temperature detecting means for detecting a temperature of the storage battery; means for determining a reference amount of consumed energy of the storage battery; and consumed energy calculating means for multiplying said reference amount of consumed energy at a present time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the present time, thereby determining an amount of consumed electric energy of the storage battery; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying a reference remanent stored energy by a remanent-energy corrective coefficient which is predetermined depending on the temperature of the storage battery as detecting by said temperature detecting means when the storage battery was last charged.
Claim 43
Independent Claim
146 words
An apparatus for detecting the remanent stored energy in a storage battery, comprising: temperature detecting means for detecting a temperature of the storage battery; means for determining a reference amount of consumed energy of the storage battery; and consumed energy calculating means for multiplying said reference amount of consumed energy at a present time by a first consumed-energy corrective coefficient which is determined depending on the temperature of the storage battery as detected by said temperature detecting means at the present time, thereby determining an amount of consumed electric energy of the storage battery; and remanent energy calculating means for determining a remanent stored energy of the storage battery by multiplying a reference remanent stored energy by a remanent-energy corrective coefficient which is predetermined depending on the temperature of the storage battery as detecting by said temperature detecting means when the storage battery was last charged.
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