| CPC H01M 8/04156 (2013.01) [H01M 8/04432 (2013.01); H01M 8/04492 (2013.01); H01M 8/04828 (2013.01)] | 8 Claims |
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1. A condensate water drain control method for a fuel cell, comprising:
estimating a reaction amount of fuel in a fuel cell stack;
controlling a drain valve to be opened, wherein the drain valve allows or blocks drainage of condensate water stored in a water trap for storing the condensate water of a fuel supply line on the basis of the estimated reaction amount;
controlling the drain valve to be closed on the basis of a state of supplying fuel to the fuel cell stack through the fuel supply line in a state in which the drain valve is opened;
estimating a fuel drainage amount drained through an outlet of the water trap after the controlling of the drain valve to be closed; and
controlling a purge valve to be opened, wherein the purge valve controls purge for draining a gas of the fuel supply line to an outside on the basis of the estimated fuel drainage amount,
wherein in the estimating of the fuel drainage amount, the fuel drainage amount is estimated based on a pressure difference between a pressure at an anode side of the fuel cell stack and an external pressure,
in the state in which the drain valve is opened, it is determined whether an opening degree of a fuel supply valve in a fuel tank is equal to or less than a predetermined threshold opening degree when a predetermined opening time of the drain valve is elapsed from a point of time at which the drain valve is controlled to be opened, and
in response to determining that the opening degree of the fuel supply valve is equal to or less than the predetermined threshold opening degree, a criterion of the reaction amount for controlling the drain valve to be opened is reduced.
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