Method for diagnosing failure of current breaking device and energy storage apparatus
AssigneeGS Yuasa International Ltd.
InventorYuki Imanaka
Life of this patent
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Abstract
A method for diagnosing failure of a current breaking device 21A included in a power supply system 12 of a vehicle 1 includes: a supply step of supplying power to a first electric load 11 and a first energy storage apparatus 13 by a power supply apparatus 14; a command step of commanding the current breaking device 21A to perform cutoff while power is supplied from the power supply apparatus 14 to the first electric load 11 and the first energy storage apparatus 13; and a determination step of measuring a charge current of a secondary battery 20A by a current sensor 21B while the cutoff is commanded to the current breaking device 21A, and determining presence or absence of failure of the current breaking device 21A based on a measured current value.
Claims15
A method for diagnosing failure of a current breaking device included in a power supply system of a moving body, the power supply system including a first energy storage apparatus connected to a first electric load of the moving body and a power supply apparatus connected in parallel to the first energy storage apparatus, the first energy storage apparatus including an energy storage device, an external terminal, the current breaking device connected in series with the energy storage device and disposed between the energy storage device and the external terminal, and a current sensor that measures a charge current of the energy storage device, the failure diagnosis method comprising:
- supplying in which the power supply apparatus supplies power to the first electric load and to the first energy storage apparatus;
- commanding the current breaking device to perform cutoff while power is supplied from the power supply apparatus to the first electric load and to the first energy storage apparatus;
- measuring the charge current of the energy storage device using the current sensor while the cutoff is issued to the current breaking device, and
- determining presence or absence of failure of the current breaking device based on the charge current of the energy storage device measured by the current sensor while the cutoff is issued to the current breaking device,
- wherein:
- the current sensor measures whether a current value is greater than or equal to a first predetermined value,
- in the supplying, a voltage is converted by a voltage converter such that the current value of the current flowing through the first energy storage apparatus becomes less than or equal to a second predetermined value, and
- when the current value of the measured charge current is greater than or equal to a third predetermined value when the current is flowing through the first energy storage apparatus, the method further comprises determining whether the power is supplied from a second energy storage apparatus to the first electric load and procession to the commanding of the current breaking device to perform cutoff.
A method for diagnosing failure of a current breaking device included in a power supply system of a moving body, the power supply system including a first energy storage apparatus connected to a first electric load of the moving body and a power supply apparatus including a voltage converter connected in parallel to the first energy storage apparatus, the first energy storage apparatus including an energy storage device, an external terminal, the current breaking device connected in series with the energy storage device and disposed between the energy storage device and the external terminal, and a current sensor that measures a discharge current of the energy storage device, the failure diagnosis method comprising:
- supplying power from the first energy storage apparatus to the first electric load while keeping a state where power is supplied from the power supply apparatus to the first electric load;
- commanding the current breaking device to perform cutoff while power is supplied from the first energy storage apparatus to the first electric load;
- measuring the discharge current of the energy storage device using the current sensor while the cutoff is issued to the current breaking device,
- determining presence or absence of failure of the current breaking device based on the discharge current of the energy storage device measured by the current sensor while the cutoff is issued to the current breaking device, and
- instructing the voltage converter to convert a voltage measured at a point adjacent the voltage converter into a voltage equal to or less than a voltage of the first energy storage apparatus and greater than or equal to an operating voltage of the first electric load.
An energy storage apparatus mounted on a moving body including an electric load and a power supply apparatus, the energy storage apparatus comprising:
- an energy storage device;
- an external terminal;
- a current breaking device connected in series with the energy storage device and disposed between the energy storage device and the external terminal;
- a current sensor that measures a charge current of the energy storage device;
- and
- a management unit,
- wherein the management unit executes:
- command processing for commanding the current breaking device to perform cutoff while power is supplied from the power supply apparatus to the electric load and the energy storage apparatus;
- and
- determination processing for:
- measuring the charge current of the energy storage device using the current sensor while the cutoff is issued to the current breaking device, and
- determining presence or absence of failure of the current breaking device based on the charge current of the energy storage device measured by the current sensor while the cutoff is issued to the current breaking device,
- wherein:
- the current sensor measures whether a current value is greater than or equal to a first predetermined value,
- in the supplying of the power, a voltage is converted by a voltage converter such that the current value of the current flowing through the first energy storage apparatus becomes less than or equal to a second predetermined value, and
- when the current value of the measured charge current is greater than or equal to a third predetermined value when the current is flowing through the first energy storage apparatus, the method further comprises determining whether the power is supplied from a second energy storage apparatus to the first electric load and procession to the commanding of the current breaking device to perform cutoff.
An energy storage apparatus mounted on a moving body including an electric load, a power supply apparatus and a voltage converter, the energy storage apparatus comprising:
- an energy storage device;
- an external terminal;
- a current breaking device connected in series with the energy storage device and disposed between the energy storage device and the external terminal;
- a current sensor that measures a discharge current of the energy storage device;
- and
- a management unit,
- wherein the management unit includes:
- command processing for commanding the current breaking device to perform cutoff when power is supplied from the energy storage apparatus to the electric load while keeping a state where power is supplied from the power supply apparatus to the electric load when power is not supplied from the energy storage apparatus to the electric load;
- and
- determination processing for:
- measuring the discharge current of the energy storage device using the current sensor while the cutoff is issued to the current breaking device,
- determining presence or absence of failure of the current breaking device based on the discharge current of the energy storage device measured by the current sensor while the cutoff is issued to the current breaking device, and
- instructing the voltage converter to convert a voltage measured at a point adjacent the voltage converter into a voltage equal to or less than a voltage of the first energy storage apparatus and greater than or equal to an operating voltage of the electric load.
Dependencies are inferred from the claim text.