US2016301091A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016301091-A1 |
| Application number | US-201615097669-A |
| Country | US |
| Kind code | A1 |
| Filing date | Apr 13, 2016 |
| Priority date | Dec 9, 2010 |
| Publication date | Oct 13, 2016 |
| Grant date | — |
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The present invention provides a relative humidity and condensed water estimator for a fuel cell and a method for controlling condensed water drain using the same. Here, the relative humidity and condensed water estimator is utilized in control of the fuel cell system involving control of anode condensed water drain by outputting at least two of signals comprising air-side relative humidity, hydrogen-side relative humidity, air-side instantaneous or cumulative condensed water, hydrogen-side instantaneous or cumulative condensed water, instantaneous and cumulative condensed water of the humidifier, membrane water contents, catalyst layer oxygen partial pressure, catalyst layer hydrogen partial pressure, stack or cell voltage, air-side catalyst layer relative humidity, hydrogen-side catalyst layer relative humidity, oxygen supercharging ratio, hydrogen supercharging ratio, residual water in a stack, and residual water in a humidifier.
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What is claimed is: 1 - 19 . (canceled) 20 . A method for controlling condensed water drain using a relative humidity and condensed water estimator for a fuel cell, the method comprising: calculating a residual amount of condensed water based on a water balance equation in an anode condensed water collector; determining a condensed water level sensor is at a warning stage if the residual amount of condensed water is greater than a product of a density (ρ[kg/m̂3]) of condensed water and a total volume (V 1 [m̂3]) of the condensed water collector, and a duration thereof is greater than the reference value t 1 ; determining the condensed water level sensor has failed if V_cell is smaller than V_cell_TH, ΔV_cell is greater than ΔV_cell_TH, hydrogen recycle blower RPM is smaller than RPM_cmd_RPM_TH, anode stack inlet pressure is greater than inlet normal pressure map plus P_TH, or anode stack outlet pressure is greater than outlet normal pressure map plus P_TH, and a duration thereof is greater than a reference value t 2 ; and performing a control of a condensed water drain valve based on an anode water trap (AWT) estimated value. 21 . The method of claim 20 , wherein the residual amount of condensed water is calculated by the following equation: Residual condensed water [ kg ] = ∑ t = 0 t = ∞ [ A W T - ( Anode condensed water drain valve on ) × ( Condensed water outflow per second ) ] × Δ t + Residual condensed water initial value 22 . The method of claim 20 , wherein, upon drain valve control, if the residual amount of condensed water is greater than a product of the density (ρ[kg/m̂3]) of condensed water and a volume (V 2 [m̂3]) of the condensed water collector from the bottom thereof to a location of the water sensor, and the duration is greater than a reference value (t 3 ), a control for opening the condensed water drain valve is performed. 23 . The method of claim 20 , wherein, upon drain valve control, if the residual amount of condensed water is smaller than a product of the density (ρ[kg/m̂3]) of condensed water and a value obtained by subtracting a condensed water difference acceptable reference value (V_TH) from a volume (V 2 [m̂3]) of the condensed water collector from the bottom thereof to a location of the water sensor, or a drain valve open duration is greater than a reference value (t 4 ), a control for closing the condensed water drain valve is performed. 24 . A method for controlling condensed water drain using a relative humidity and condensed water estimator for a fuel cell, the method comprising: calculating a residual amount of condensed water based on a water balance equation in an anode condensed water collector; determining as a warning stage of a condensed water level sensor if the residual amount of condensed water is equal to or smaller than 0, and a duration thereof is greater than a reference value (t 5 ); determining as a failure of a condensed water level sensor if a calculated hydrogen utilization rate is smaller than a value obtained by subtracting a hydrogen utilization rate acceptable reference value from a normal hydrogen utilization rate map, or a hydrogen leakage sensor is on, and the duration is greater th
Pressure; Ambient pressure; Flow · CPC title
of fuel cell reactants · CPC title
Humidity; Water content · CPC title
Humidity; Ambient humidity; Water content · CPC title
Means for solving freezing problems · CPC title
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