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Responding to positive rate of change of fuel cell voltage during power reduction transitions

A fuel cell and power technology, applied in the direction of fuel cells, power system fuel cells, regulating electrical variables, etc.

Active Publication Date: 2015-11-11
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This modality utilizes these same devices and controls, but adds another dimension to that control: detecting the slope of the stack voltage using a continuous derivative with an associated filter for noise

Method used

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  • Responding to positive rate of change of fuel cell voltage during power reduction transitions
  • Responding to positive rate of change of fuel cell voltage during power reduction transitions
  • Responding to positive rate of change of fuel cell voltage during power reduction transitions

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Embodiment Construction

[0018] see figure 1 , the vehicle 150 includes a fuel cell stack 151 that includes a plurality of contiguous fuel cells, each fuel cell having a membrane electrode assembly (MEA) 16, in figure 1 Only one fuel cell 12 is shown in FIG. The electrical output at the positive and negative terminals of the fuel cell stack 151 is connected by a pair of wires 155 , 156 through a switch 158 to a vehicle propulsion system 159 . This output is also connected to VLD control 200 via line 160 .

[0019] The reservoir 164 of the water circulation system has an outlet 165 . The water circulation system may include trim valves 166, water passages (such as those within water transfer plates 84, 86, 88, 89), radiators and fans 168, 169 (which are selectively operable to cooling) and a controllable water pump 170.

[0020] Ambient air at inlet 173 is provided by a pump such as blower 174 to cathode oxidant reactant gas flow field 19 and from there to exhaust 176 through pressure regulating ...

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Abstract

During power reduction transitions of a fuel cell power plant, the excess electric energy generated by consumption of reactants is extracted, during one or more periods of time, by a voltage limiting device control (200) in response to a controller (185) as i) energy dissipated in a resistive auxiliary load or ii) as energy applied to an energy storage system (201) (a battery), in boost and buck embodiments. The controller operates the voltage limiting device control in response to the positive time derivative of the voltage of one or more of the fuel cells exceeding a predetermined limiting value.

Description

technical field [0001] This profile involves dissipating or storing electrical energy extracted from the fuel cell stack in one or several steps during a power reduction transition in response to a positive rate of fuel cell voltage change. Background technique [0002] When the power drawn on a fuel cell power plant is reduced or removed, as in Figure 8 As shown in , the fuel cell reduces or stops converting hydrogen fuel to electricity. If this excess fuel is dumped, it may cause operational problems, such as overheating of the power plant. This is characteristic of all fuel cell power plants because the reaction time of the chemical and mechanical balance of the power plant components is inherently slower than the magnitude of the electrical load change. When a down-transient occurs (electrical load removal or reduction), there is a period of time during which fuel cell balancing of the power plant continues at the same rate as before the down-transient occurred Supply...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/10G05F1/66
CPCG05F1/66H01M8/04544H01M8/04753H01M16/003H01M16/006H01M2008/1095H01M2250/20Y10T307/604H01M8/04552H01M8/04559H01M8/04619H01M8/04873H01M8/0488H01M8/0494H01M8/04992Y02E60/10Y02E60/50Y02T90/40
Inventor D.F.奥尔洛夫斯基
Owner AUDI AG