Exhaust state control device for fuel cell for mobile unit
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first embodiment
[0042]A fuel cell system according to the present invention is described below with reference to FIGS. 1 to 3.
[0043]FIG. 1 shows an example configuration of a fuel cell system in accordance with an embodiment of the present invention. As shown in FIG. 1, the fuel cell system includes a fuel cell stack 1. The fuel cell system also includes, a hydrogen tank 7, which serves as its hydrogen system that supplies hydrogen to the fuel cell stack 1; a pressure regulator 10, an anode gas passage 2, an anode off gas passage 3, a hydrogen pump 8, an anode off gas circulation passage 4, a gas-liquid separator 12, which separates water from anode off gas; a drain tank 13, and an exhaust / drain valve 14. The fuel cell system additionally includes, as its air system that supplies air to the fuel cell stack 1, an air filter 11, a pump 9, a cathode gas passage 5, and a cathode off gas passage 6. The fuel cell system further includes, as its control system and measurement system, an electronic control...
second embodiment
[0096]In addition, in and after S2 of FIG. 7, the same processes as those in and after S2 of FIG. 2 are executed. Alternatively, in and after S2 of FIG. 7, the same processes as those in and after S4 of FIG. 3 may be executed. As a further alternative, the same processes as those in and after S2 of FIG. 5, or those in and after S4 of FIG. 6, of the second embodiment may be executed in and after S2 of FIG. 7.
[0097]Referring to FIGS. 9 to 11, a fuel cell system in accordance with a fourth embodiment of the present invention will be described. In the first to third embodiments, when white smoke reduction is determined to be necessary, then the ECU 15 executes the white smoke reduction control or the white smoke suppression control depending on whether white smoke is highly visible from outside the vehicle, or whether white smoke affects the vision of the driver.
[0098]In this embodiment, the fuel cell system dilutes the cathode off gas containing water vapor and having passed through th...
fourth embodiment
[0111]As discussed above, according to the fuel cell system in accordance with the fourth embodiment, the ECU 15 controls the discharge amount of the cathode off gas, that is, the rotational speed of the pump 9, such that the dilution ratio is at the reference value Dr0 or less based on the saturated vapor pressure of the cathode off gas, the saturated vapor pressure of the ambient air, and the vehicle speed. According to such control, white smoke due to the cathode off gas may be controlled so as not to be noticeable by controlling the discharge amount, that is, the dilution ratio, of the cathode off gas according to the vehicle speed v.
[0112]In the fourth embodiment, the ECU 15 controls the discharge amount, that is, the dilution ratio, of the cathode off gas according to the vehicle speed v to suppress white smoke. In such control, the ECU 15 may further control the backpressure at the cathode side. The backpressure at the cathode side is controlled by the opening of the backpres...
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