Vehicle-mounted power supply system
First Claim
1. A vehicle-mounted power supply system comprising:
- a first storage battery;
an automotive generator driven by an engine for generating electrical energy and charging said first storage battery with the generated electrical energy;
a second storage battery connected to an electrical load;
a power converter for supplying electric energy from said first storage battery to said second storage battery; and
a controller for setting said power converter in a sleep mode when said engine is stopped, periodically detecting the voltage of said second storage battery as a pseudo-open circuit voltage during said sleep mode if current of said second storage battery is within a predetermined range, estimating a state of charge of said second storage battery from the detected pseudo-open circuit voltage and setting said power converter in a run mode when the estimated state of charge is lower than a predetermined value.
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Accused Products
Abstract
A vehicle-mounted power supply system comprises a first storage battery, an automotive generator for generating electrical energy and charging the first storage battery with the generated electrical energy. A second storage battery is connected to an electrical load and a power converter supplies electric energy from the first storage battery to the second storage battery. A controller, or battery-monitoring unit, sets the power converter in a sleep mode when the vehicle engine is stopped, periodically detects the voltage of the second storage battery as a pseudo-open circuit voltage during the sleep mode of the power converter if current of the second storage battery is within a predetermined range, estimates a state of charge of the second storage battery from the detected pseudo-open circuit voltage and sets the power converter in a run mode when the estimated state of charge is lower than a predetermined value.
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Citations
18 Claims
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1. A vehicle-mounted power supply system comprising:
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a first storage battery; an automotive generator driven by an engine for generating electrical energy and charging said first storage battery with the generated electrical energy; a second storage battery connected to an electrical load; a power converter for supplying electric energy from said first storage battery to said second storage battery; and a controller for setting said power converter in a sleep mode when said engine is stopped, periodically detecting the voltage of said second storage battery as a pseudo-open circuit voltage during said sleep mode if current of said second storage battery is within a predetermined range, estimating a state of charge of said second storage battery from the detected pseudo-open circuit voltage and setting said power converter in a run mode when the estimated state of charge is lower than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of operating a vehicle-mounted power supply system which comprises a first storage battery, an automotive generator driven by an engine for generating electrical energy and charging the first storage battery with the generated electrical energy, a second storage battery connected to an electrical load, and a power converter for supplying electric energy from said first storage battery to said second storage battery, the method comprising the steps of:
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a) setting said power converter in a sleep mode when said engine is stopped; b) periodically detecting the voltage of said second storage battery as a pseudo-open circuit voltage during said sleep mode if current of said second storage battery is within a predetermined range; and c) estimating a state of charge of said second storage battery from the detected pseudo-open circuit voltage and setting said power converter in a run mode when the estimated state of charge is lower than a predetermined value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification