Fuel cell system comprising a metering unit
A fuel cell and dosing unit technology, applied in fuel cells, fuel cell additives, circuits, etc., can solve the problems of high self-consumption, high cost, high parasitic power, etc., and achieve the effect of saving electric energy and simplifying control
Active Publication Date: 2010-05-26
ROBERT BOSCH GMBH
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Problems solved by technology
Therefore the control of a large number of injection valves is relatively expensive
[0010] A further disadvantage is that the corresponding gas injection valve requires a current of about 1 A at maximum mass or in the fully open state
This leads, on the one hand, to a correspondingly expensive controller in the case of a plurality of valves, and on the other hand, to a relatively high consumption of the dosing itself, or relatively high so-called parasitic power
Method used
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[0043] exist figure 1 In this, the fuel cell reactor 1 is supplied with hydrogen 2 for the anode 3 on the one hand and air 4 for the cathode 5 on the other hand.
[0044] The air 4 is compressed by means of the compressor 6 and then moistened with water by means of the humidifier 7 so that the membrane 8 of the fuel cell reactor 1 does not dry out on the one hand and is not too humid on the other hand.
[0045] The fuel cell reactor 1 has an outlet 9 on which a throttle valve 10 is arranged for regulating the outflow or for generating a stagnation pressure. Arranged on the anode side of the fuel cell reactor 1 is a valve 11 which is closed during normal operation and which is opened, for example, for flushing the anode 3 . The latter serve in particular to flush out nitrogen etc. which accumulate on the anode side.
[0046] In this embodiment variant, the hydrogen 2 is stored in a high-pressure tank 12 which can be closed by means of a shut-off valve 13 . For example hydrog...
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The invention relates to a fuel cell system comprising a fuel cell unit (1) and a metering unit for metering a quantity of a substance for at least one electrode (3, 5), said metering unit comprisingat least two metering elements (16, 17) that are connected in parallel. Said system simplifies the control of the substance quantity to be metered and permits in particular a comparatively sensitive and / or relatively rapid control of the substance quantity to be metered or has the lowest possible internal consumption. The system should also be capable of diagnosing faults, i.e. should recognise adevelopment of pressure ratios that could damage the system. To achieve this, the first metering element (16) is configured as a control element for controlling the flow cross-section of the second metering element (17) by means of a pneumatic coupling.
Description
technical field [0001] The invention relates to a fuel cell system with a fuel cell unit, in which a metering unit is provided for metering a quantity of substance to at least one electrode. Background technique [0002] Fuel cell-supported systems are the first to attract intense attention today as an alternative drive concept for automobiles, ships or the like and as energy centers. Such systems usually include a PEM fuel cell (PEM: Proton Exchange Membrane), which is often operated with hydrogen and air as energy carriers. In addition, other fuel cell systems have been used. [0003] On the one hand the hydrogen is tanked and stored in the car. On the other hand, for example, hydrogen is produced directly "on-board" from fuels such as methanol, methane, diesel in an upstream reformer stage as required and consumed accordingly. [0004] In such fuel cell systems, therefore, a large number of material flows must be metered flexibly and still very precisely. This applies...
Claims
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IPC IPC(8): H01M8/04
CPCH01M2008/1095H01M8/04104Y02E60/50
Inventor W·斯特罗尔U·戈特威克
Owner ROBERT BOSCH GMBH