Voltage control system, fuel cell system, and control method for voltage control system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYutaka TANO, Kenji UMAYAHARA, Takahiro UMEHARA
Life of this patent
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Abstract
A voltage control system includes: a converter controlling portion; a current value acquisition portion; and a voltage value acquisition portion. The converter controlling portion sets a duty ratio in a present cycle by adding an addition term to a feedforward term, the addition term being determined by use of a current deviation, which is a difference between a target value of an output current in the present cycle and a current measured value in a previous cycle, and the duty ratio in the previous cycle, the addition term being corresponding to an increase of the output current in the present cycle.
Claims12
A voltage control system that increases an input voltage, the voltage control system comprising:
- a converter device including a reactor and configured to perform accumulation and release of electrical energy with respect to the reactor in one cycle, the converter device being configured to operate by use of a duty ratio determined as a ratio of an accumulation period during which the energy is input and accumulated into the reactor in the one cycle;
- a converter controlling portion configured to set the duty ratio and control an output voltage of the converter device;
- a current value acquisition portion configured to acquire a current measured value, which is a measured value of an output current found as an average, relative to a time, of a current value output from the reactor in the one cycle;
- and
- a voltage value acquisition portion configured to acquire an input side voltage value indicative of an input voltage of the converter device and an output side voltage value indicative of an output voltage of the converter device, wherein
- the converter controlling portion sets the duty ratio in a present cycle by use of a feedforward term and an addition term, the feedforward term being derived by use of the input side voltage value and the output side voltage value acquired at a beginning of the present cycle, the addition term being determined by use of a current deviation, which is a difference between a target value of the output current and the current measured value in a previous cycle, and the duty ratio in the previous cycle, the addition term being added to the feedforward term, the addition term being corresponding to an increase of the output current in the present cycle.
A control method for a voltage control system that increases an input voltage by use of a converter device including a reactor and configured to perform accumulation and release of electrical energy with respect to the reactor in one cycle, the converter device being configured to operate by use of a duty ratio determined as a ratio of an accumulation period during which the energy is input and accumulated into the reactor in the one cycle, the control method comprising:
- acquiring a current measured value, which is a measured value of an output current found as an average, relative to a time, of a current value output from the reactor in the one cycle;
- acquiring an input side voltage value indicative of an input voltage of the converter device and an output side voltage value indicative of an output voltage of the converter device at a beginning of a present cycle;
- setting the duty ratio by use of the current measured value, the input side voltage value, and the output side voltage value so as to control the output voltage of the converter device;
- at a time of controlling the output voltage of the converter device, setting the duty ratio in the present cycle by use of a feedforward term and an addition term, the feedforward term being derived by use of the input side voltage value and the output side voltage value, the addition term being determined by use of a current deviation, which is a difference between a target value of the output current and the current measured value in a previous cycle, and the duty ratio in the previous cycle, the addition term being added to the feedforward term, the addition term being corresponding to an increase of the output current in the present cycle.
Dependencies are inferred from the claim text.