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Stability expansion control method for ultrahigh-speed electric air compressor of hydrogen-oxygen fuel cell automobile

A technology of air compressors and fuel cells, applied in battery/fuel cell control devices, fuel cells, fuel cell additives, etc., to achieve the effect of ensuring work stability and preventing surge

Active Publication Date: 2021-03-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On ultra-high speed air compressors, it is easier to have surge problems first

Method used

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  • Stability expansion control method for ultrahigh-speed electric air compressor of hydrogen-oxygen fuel cell automobile
  • Stability expansion control method for ultrahigh-speed electric air compressor of hydrogen-oxygen fuel cell automobile

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Embodiment Construction

[0048] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0049]On a FC4 vehicle, surge is caused by strong flow separation in the impeller and diffuser when the centrifugal compressor operates at a certain small flow rate. Centrifugal compressor surge depends on two factors: First, the actual operating flow rate of the compressor is less than the surge flow rate of the compressor; the operating condition of the compressor is far from the design point, and the flow rate is less than the minimum value. Second, the outlet pressure of the compressor is lower than the pressure of the pipe network, causing gas backflow and large vibrations. The above two reasons together contribute to the generation of surge.

[0050] In order to solve the problem of surge, the present invention proposes an extended stability control method for an ultra-high-speed elect...

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Abstract

The invention discloses a stability expansion control method for an ultrahigh-speed electric air compressor of a hydrogen-oxygen fuel cell automobile, and the stability expansion control method comprises the following steps: S1, obtaining an air inlet pressure value of required air according to the current working condition of the automobile, and recording the air inlet pressure value of the required air as a first pressure value; S2, acquiring an air pressure value of the current net pipe and an outlet pressure value of a secondary air compressor; regarding the air pressure value of the net pipe as a second pressure value, and recording the outlet pressure value of the second-stage air compressor as a third pressure value; and S3, judging the relation among the first pressure value, the second pressure value and the third pressure value, and controlling the electric air compressor according to the relation. The stability of the high-speed electric air compressor during high-speed rotation can be guaranteed.

Description

technical field [0001] The invention relates to the field of air compressor control for fuel cell vehicles, in particular to an extended stability control method for ultra-high-speed electric air compressors for hydrogen-oxygen fuel cell vehicles. Background technique [0002] As the cleanest vehicle among new energy vehicles, fuel cell vehicles have already begun to be used in practice. [0003] The hydrogen-oxygen fuel cell generates electricity through the chemical reaction of hydrogen and oxygen in a non-combustible form, and uses it as the energy source for driving the car. For hydrogen, the hydrogen is supplied in a high-pressure tank, and for oxygen, in order to save costs, an air compressor is directly used to compress the air before supplying the gas. Since hydrogen only accounts for about 20% in the air, it is necessary to compress a large amount of air when using an air compressor to compress and supply air. This requires the air compressor on the hydrogen-oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04082H01M8/04089H01M8/04111H01M8/0438H01M8/04746B60L50/70B60L58/30
CPCB60L50/70B60L58/30H01M8/04104H01M8/04111H01M8/04201H01M8/0438H01M8/04425H01M8/04746H01M8/04776H01M8/04783Y02E60/50Y02T90/40
Inventor 周稼铭何洪文李建威衣丰艳胡东海衣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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