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Battery management system for electric vehicle
| Details |
Inventors: Takahashi, Tsutomu;
Assignee: Fuji Jukogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Tso; Edward H.
Assistant Examiner:
Attorney, Agent or Firm: Beveridge, DeGrandi, Weilacher & Young, L.L.P.
A battery monitoring routine is executed at a short period such as one minute as an initial value when a key switch is turned on to drive an electric vehicle (so that the battery is discharged). On the other hand, when the key switch is turned off to stop or park the electric vehicle so that the battery is released open from discharge, the battery monitoring routine is executed at a short period such as one minute to measure the battery data finely within a specified time such as 30 minutes, but at a long period such as one hour to measure the battery data coarsely after the specified time such as 30 minutes to save monitoring power. The battery deterioration can be monitored by measuring the restoration status of the battery after released open from discharge, for recharging or replacement of the battery. |
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DETAILED DESCRIPTION With these problems, therefore, there is the object of the present invention to provide a battery management system for an electric vehicle, which can monitor the battery status (e.
g.
, remaining capacity) even after the key switch has been kept turned off (i.
e.
, even when the electric vehicle is kept parked), without consuming a large current for a management or monitoring of the battery.
To achieve the above-mentioned object, the present invention provides a car battery -management system, comprising: detecting means (11) for detecting various conditions of a car battery (4) mounted on an electric vehicle; management means (9, 10; 14, 15, 32) for monitoring status of the battery on the basis of the various battery conditions detected by the detecting means to manage the monitored battery; storing means (12) for storing the battery status monitored by the monitoring means; key switching means (17) connected to an auxiliary battery (8), for activating the detecting means and the control means whenever turned on; and activating means (13, 16, 33, 35, 36; 14, 32) associated with the key switching means (17), for activating the detecting means and the management means at a long monitoring start period when the key switching means (17) is turned off, under management of the management means, to keep monitoring the car battery even after the key switching means has been turned off, while reducing monitoring power consumption.
In the first aspect of the present invention, the activating means includes: a real time clock generator (13) for generating a clock signal; and a first switching element (16) connected in parallel to the key switching means, for supplying a power to the detecting means and the management means in response to the clock generated by the real time clock generator, the real time clock generator and the first switching element being both connected to the auxiliary battery (8).
In a modification of the first aspect according to the present invention, the system further comprises a backup battery (21) for activating the real time clock generator, the backup battery being recharged by a battery charger (22) activated when the key switching means (17) is turned on
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Navigation and GPS 
