Patent ID: 11862824
Assignee: HYUNDAI MOTOR COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A fuel cell system comprising:
a hydrogen supply unit connected to a hydrogen inlet side of a fuel cell stack, with a supply valve and a sensor being provided in the hydrogen supply unit;
a hydrogen discharge unit connected to a hydrogen outlet side of the fuel cell stack, with a water trap and a purge valve being provided in the hydrogen discharge unit; and
a controller configured to calculate an amount of hydrogen discharged through the purge valve from an amount of hydrogen supplied to the fuel cell stack and an amount of hydrogen consumed therein, and to perform compensation control of the supply valve when the amount of the discharged hydrogen is at or above a reference value,
wherein the controller calculates the amount of the discharged hydrogen from the amount of the supplied hydrogen, the amount of the consumed hydrogen, and an amount of hydrogen pressurized in the fuel cell stack,
wherein the controller calculates the amount of the pressurized hydrogen from internal pressure of a hydrogen electrode of the fuel cell stack, and
wherein when the amount of the discharged hydrogen is at or above the reference value, the controller determines a compensation value based on a hydrogen purge map from the amount of the discharged hydrogen, and controls the supply valve with a value obtained by adding the compensation value to a control value with which the supply valve is controlled, thereby preventing an undershoot or an overshoot in the amount of the supplied hydrogen.