Device and method for charging control
First Claim
1. A charging control device for controlling a charging of a secondary battery with a generator driven by an engine, comprising:
- a charge current detection unit configured to detect a charge current supplied to the secondary battery;
a discharge current detection unit configured to detect a discharge current supplied from the secondary battery;
a charge/discharge integration unit configured to compute an integrated charge/discharge value of the secondary battery according to the charge current and the discharge current;
a state of charge determination unit configured to determine a state of charge of the secondary battery according to the charge current while the secondary battery is being charged;
a state of charge recognition configured to recognize a state of charge of the secondary battery according to the integrated charge/discharge value as a recognized state of charge and to calibrate the recognized state of charge according to the state of charge determined by the state of charge determination unit;
a charge control unit configured to control the charging of the secondary battery such that the recognized state of charge is maintained at a prescribed upper limit value lower than a fully charged state by switching a generation voltage of the generator, the charge control unit being configured to charge the secondary battery over a prescribed determination time period required for the state of charge determination unit to determine the state of charge immediately after a starting of the engine; and
a terminal disconnection detection unit configured to detect a disconnection of a terminal of the secondary battery;
wherein the charge control unit is configured such that when a disconnection of the terminal of the secondary battery is detected, a secondary battery is reconnected after the disconnection, and a state of charge of the reconnected secondary battery as determined immediately after a subsequent starting of the engine is higher than the prescribed upper limit value, the charge control unit prohibits the charging of the reconnected secondary battery until the integrated charge/discharge value computed since the reconnection of the secondary battery reaches a prescribed discharge value.
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Accused Products
Abstract
Provided is a charging control device that allows the actual state of charge of a secondary battery to converge quickly to an upper limit value given as a control center value when the actual state of charge is higher than the upper limit value so that charging may be performed in an efficient manner and fuel economy may be improved. The charging control device (10) includes a charge/discharge integration unit (23) for computing an integrated charge/discharge value (IW) of the secondary battery, a charge control unit (26) for controlling the charging of the secondary battery such that the recognized state of charge is maintained at a prescribed upper limit value (80%) lower than a fully charged state (100%) by switching a generation voltage of a generator. When a disconnection of a terminal of the secondary battery is detected by a terminal disconnection detection unit (25), the charge control unit (26) prohibits the charging of the secondary battery from then on until the integrated charge/discharge value reaches a prescribed discharge value (−20%).
31 Citations
6 Claims
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1. A charging control device for controlling a charging of a secondary battery with a generator driven by an engine, comprising:
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a charge current detection unit configured to detect a charge current supplied to the secondary battery; a discharge current detection unit configured to detect a discharge current supplied from the secondary battery; a charge/discharge integration unit configured to compute an integrated charge/discharge value of the secondary battery according to the charge current and the discharge current; a state of charge determination unit configured to determine a state of charge of the secondary battery according to the charge current while the secondary battery is being charged; a state of charge recognition configured to recognize a state of charge of the secondary battery according to the integrated charge/discharge value as a recognized state of charge and to calibrate the recognized state of charge according to the state of charge determined by the state of charge determination unit; a charge control unit configured to control the charging of the secondary battery such that the recognized state of charge is maintained at a prescribed upper limit value lower than a fully charged state by switching a generation voltage of the generator, the charge control unit being configured to charge the secondary battery over a prescribed determination time period required for the state of charge determination unit to determine the state of charge immediately after a starting of the engine; and a terminal disconnection detection unit configured to detect a disconnection of a terminal of the secondary battery; wherein the charge control unit is configured such that when a disconnection of the terminal of the secondary battery is detected, a secondary battery is reconnected after the disconnection, and a state of charge of the reconnected secondary battery as determined immediately after a subsequent starting of the engine is higher than the prescribed upper limit value, the charge control unit prohibits the charging of the reconnected secondary battery until the integrated charge/discharge value computed since the reconnection of the secondary battery reaches a prescribed discharge value. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a charging of a secondary battery from a generator driven by an engine, comprising the steps of:
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detecting a charge current supplied to the secondary battery; detecting a discharge current supplied from the secondary battery; computing an integrated charge/discharge value of the secondary battery according to the charge current and the discharge current; recognizing a state of charge of the secondary battery according to the integrated charge/discharge value as a recognized state of charge; controlling the charging of the secondary battery such that the recognized state of charge is maintained at a prescribed upper limit value lower than a fully charged state by switching a generation voltage of the generator; determining a state of charge of the secondary battery according to the charge current while the secondary battery is being charged; charging the secondary battery over a prescribed determination time period required to determine the state of charge immediately after a starting of the engine; calibrating the recognized state of charge according to the determined state of charge; detecting a disconnection of a terminal of the secondary battery; and when a disconnection of the terminal of the secondary battery is detected, a secondary battery is reconnected after the disconnection, and a state of charge of the reconnected secondary battery as determined immediately after a subsequent starting of the engine is higher than the prescribed upper limit value, prohibiting the charging of the reconnected secondary battery until the integrated charge/discharge value computed since the reconnection of the secondary battery reaches a prescribed discharge value.
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Specification