Power system of hybrid fuel cell bus and control method thereof
First Claim
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1. A power system of a hybrid fuel cell bus, comprising:
- a fuel cell stack;
a super capacitor connected to the fuel cell stack;
a traction motor supplied with electric power from the fuel cell stack or from both the fuel cell stack and the super capacitor so as to drive a vehicle, and supplying electric power generated by regenerative braking to the supper capacitor;
a motor control unit controlling an electric power input to the traction motor and an electric power output from the traction motor;
a first auxiliary battery supplying electric power to first electric parts designed for operation of a fuel cell vehicle;
a second auxiliary battery supplying electric power to second electric parts designed for operation of an internal combustion engine vehicle; and
a stack starting part electrically connected to one of the first and the second auxiliary batteries for operating the fuel cell stack.
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Abstract
The present invention provides a power system of a hybrid fuel cell bus, comprising: a first auxiliary battery supplying electric power to first electric parts designed for operation of a fuel cell vehicle; a second auxiliary battery supplying electric power to second electric parts designed for operation of an internal combustion engine vehicle; and a stack starting part electrically connected to one of the first and the second auxiliary batteries for operating the fuel cell stack.
44 Citations
19 Claims
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1. A power system of a hybrid fuel cell bus, comprising:
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a fuel cell stack; a super capacitor connected to the fuel cell stack; a traction motor supplied with electric power from the fuel cell stack or from both the fuel cell stack and the super capacitor so as to drive a vehicle, and supplying electric power generated by regenerative braking to the supper capacitor; a motor control unit controlling an electric power input to the traction motor and an electric power output from the traction motor; a first auxiliary battery supplying electric power to first electric parts designed for operation of a fuel cell vehicle; a second auxiliary battery supplying electric power to second electric parts designed for operation of an internal combustion engine vehicle; and a stack starting part electrically connected to one of the first and the second auxiliary batteries for operating the fuel cell stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control method of a power system of a hybrid fuel cell bus including a first auxiliary battery and a second auxiliary battery, comprising the steps of:
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(a) converting a low voltage of a first auxiliary battery to a driving voltage of a stack starting part; (b) driving the stack staring part by the driving voltage of the stack starting part; (c) operating a fuel cell stack by operation of the stack starting part; (d) generating a high voltage power by operation of the fuel cell stack; (e) switching an electric power supply passage to the stack starting part so as to convert the high voltage power to the voltage of the stack starting part, and supplying the converted voltage to the stack starting part; (f) supplying the high voltage power to a traction motor; (g) converting the high voltage power to the voltage of the first auxiliary battery; and (h) charging a super capacitor with the high voltage power. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification