METHOD FOR MONITORING THE CHARGING MODE OF AN ENERGY STORE IN A VECHILE AND CHARGING SYSTEM FOR CHARGING AN ENERGY STORE IN A VECHILE
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Abstract
In a method for monitoring the charging mode of an energy store in a vehicle which is drivable via an electric machine, the energy store is connected in the charging mode to an external energy supply system via a charging circuit which includes a unit operated as the boost converter, a controllable rectifier having upstream filter capacitors, and a system filter. A DC link capacitor is switched in parallel to the energy store. During the charging mode, at least one current and/or one voltage is monitored at the input, at the output, and/or within the charging circuit, and/or a function of a control unit of the rectifier and/or of the unit operated as the boost converter is monitored. If malfunction is detected, the charging circuit is switched into a free-running mode.
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Citations
22 Claims
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1-11. -11. (canceled)
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12. A method for monitoring a charging mode operation of an energy store in a vehicle which is drivable via a three-phase electric machine, wherein the electric machine is connected to the energy store via a vehicle electrical system and is supplied with electrical power from the energy store during a driving mode, and wherein during the charging mode the energy store is connected to an external public power grid, via a charging circuit which includes a unit operated as a boost converter, and a controllable rectifier having upstream filter capacitors and a system filter, and wherein a DC link capacitor is switched in parallel to the energy store, the method comprising:
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monitoring, during the charging mode, at least one of (i) a current at least one of at an input, at an output, and within the charging circuit, (ii) a voltage at least one of at the input, at the output, and within the charging circuit, (iii) a function of a control unit of the rectifier, and (iv) a function of a control unit of the unit operated as the boost converter; and switching the charging circuit into a free-running mode, wherein in the free-running mode one branch of the controllable rectifier and all circuit elements controllable in a boost converter mode of the unit operated as the boost converter are connected through, and wherein the switching into the free-running mode occurs if at least one of the following conditions is satisfied;
the monitored current exceeds a predefined current threshold value;the monitored voltage exceeds a predefined voltage threshold value;
a malfunction of the control unit of the rectifier is detected; and
a malfunction of the control unit of the unit operated as the boost converter is detected. - View Dependent Claims (13, 14, 15, 16)
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17. A charging system for charging an energy store in a vehicle, comprising:
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a three-phase electric machine for driving the vehicle, wherein the energy store supplies the electric machine with energy during a driving mode; a vehicle electrical system via which the electric machine and the energy store are electrically connected; a DC link capacitor which is switched in parallel to the energy store; a charging circuit which includes a unit operated as a boost converter, and a controllable rectifier having upstream filter capacitors and a system filter, wherein during a charging mode, the energy store is connected to an external public power grid via the charging circuit; at least one monitoring unit which monitors at least one of (i) a current at least one of at an input, at an output, and within the charging circuit, (ii) a voltage at least one of at the input, at the output, and within the charging circuit, (iii) a function of a control unit of the rectifier, and (iv) a function of a control unit of the unit operated as the boost converter; and
an evaluation unit which selectively switches the charging circuit into a free-running mode, wherein in the free-running mode one branch of the controllable rectifier and all circuit elements controllable in a boost converter mode of the unit operated as the boost converter are connected through, and wherein the switching into the free-running mode occurs if at least one of the following conditions is satisfied;
the monitored current exceeds a predefined current threshold value;
the monitored voltage exceeds a predefined voltage threshold value;
a malfunction of the control unit of the rectifier is detected; and
a malfunction of the control unit of the unit operated as the boost converter is detected. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification