A hydrogen consumption measuring device for a liquid hydrogen fuel cell system

Abstract

The application discloses a kind of liquid hydrogen fuel cell system hydrogen consumption measuring devices, including installation in liquid hydrogen tank liquid level sensor, liquid hydrogen tank pressure sensor and install in the hydrogen ejector of stack input mouth;Hydrogen ejector is also installed with pressure sensor before hydrogen ejector;Hydrogen ejector is connected to the hydrogen output control valve of liquid hydrogen tank by heat exchanger;Hydrogen system controller is realized to the measurement of unit time hydrogen consumption by the acquisition of liquid level sensor, liquid hydrogen tank pressure sensor signal, and measurement information is sent to fuel cell controller;Fuel cell controller is realized to the measurement of unit time hydrogen flow by the acquisition of pressure sensor signal, with the hydrogen consumption of hydrogen system controller sent comparison, send final hydrogen consumption measurement value and system working condition diagnostic information.It is well solved to the accurate calculation of hydrogen consumption, while meeting the real-time terminal demand to system working condition, improve the practicability of fuel cell system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fuel cells, and particularly relates to a hydrogen consumption measuring device for a liquid hydrogen fuel cell system. BACKGROUND

[0002] At present, with the wide application of electric vehicles, various battery technologies have been widely developed, which brings innovation of battery technology. Fuel cells have been widely used because they can directly convert chemical energy into electrical energy. However, it is found that the hydrogen consumption needs to be measured in real time and accurately during the use of fuel cells. However, due to the low temperature in the liquid hydrogen tank, the scheme of adding a measuring device in the liquid hydrogen tank to realize the calculation of hydrogen consumption is not ideal, and a new measuring system needs to be designed to realize the accurate measurement of hydrogen consumption. SUMMARY

[0003] The technical problem to be solved by the application is to provide a hydrogen consumption measuring device for a liquid hydrogen fuel cell system in view of the above-mentioned deficiencies of the prior art.

[0004] To achieve the above technical purpose, the technical scheme adopted by the application is as follows:

[0005] A hydrogen consumption measuring device for a liquid hydrogen fuel cell system, the measuring device comprising a liquid level sensor installed in a liquid hydrogen tank, a liquid hydrogen tank pressure sensor, and a hydrogen gas injector installed at an input port of an electric pile;

[0006] The hydrogen gas injector is further provided with a pressure sensor in front of the hydrogen gas injector;

[0007] The hydrogen gas injector is connected to a hydrogen gas output control valve of the liquid hydrogen tank through a heat exchanger;

[0008] The liquid hydrogen tank, the hydrogen gas output control valve, the liquid level sensor, the liquid hydrogen tank pressure sensor, and the heat exchanger are controlled by a hydrogen system controller; the pressure sensor, the hydrogen gas injector, and the electric pile are controlled by a fuel cell controller;

[0009] The hydrogen system controller measures the hydrogen consumption per unit time by collecting signals of the liquid level sensor and the liquid hydrogen tank pressure sensor, and sends the measurement information to the fuel cell controller;

[0010] The fuel cell controller measures the hydrogen gas flow per unit time by collecting signals of the pressure sensor, compares the hydrogen consumption sent by the hydrogen system controller, and sends the final hydrogen consumption measurement value and system working condition diagnosis information. The hydrogen system controller and the fuel cell controller are both powered by a storage battery. A safety valve is further provided on the liquid hydrogen tank to ensure the safety of the liquid hydrogen tank.

[0011] The application has the following beneficial effects:

[0012] After the hydrogen consumption measuring device of the liquid hydrogen fuel cell system is used, the hydrogen consumption of the liquid hydrogen tank end is measured through the combination of the liquid level sensor and the liquid hydrogen tank pressure, the hydrogen consumption before the hydrogen ejector is measured through the pressure sensor before the hydrogen ejector, the final measurement value and the system working condition are output by comparing the measurement values of the two sets of measuring devices, the accurate calculation of the hydrogen consumption is well solved, the real-time terminal demand of the system working condition is met, and the practicability of the fuel cell system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a schematic diagram of the composition of the hydrogen consumption measuring device of the liquid hydrogen fuel cell system. DETAILED DESCRIPTION

[0014] The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0015] Reference Figure 1 A hydrogen consumption measuring device of a liquid hydrogen fuel cell system, the measuring device comprises a liquid level sensor installed in a liquid hydrogen tank, a liquid hydrogen tank pressure sensor P1 and a hydrogen ejector installed at the input port of the stack;

[0016] A pressure sensor P2 is further installed before the hydrogen ejector;

[0017] The hydrogen ejector is connected to the hydrogen output control valve of the liquid hydrogen tank through a heat exchanger;

[0018] The liquid hydrogen tank, the hydrogen output control valve, the liquid level sensor, the liquid hydrogen tank pressure sensor P1 and the heat exchanger are controlled by a hydrogen system controller; the pressure sensor P2, the hydrogen ejector and the stack are controlled by a fuel cell FCU controller;

[0019] The hydrogen system controller measures the hydrogen consumption per unit time by collecting the signals of the liquid level sensor and the liquid hydrogen tank pressure sensor P1, and sends the measurement information to the fuel cell FCU controller;

[0020] The fuel cell FCU controller measures the hydrogen flow per unit time by collecting the signals of the pressure sensor P2, compares the hydrogen consumption sent by the hydrogen system controller, and sends the final hydrogen consumption measurement value and the system working condition diagnosis information.

[0021] In specific implementation, the hydrogen system controller and the fuel cell (FCU) controller are both powered by a storage battery.

[0022] In specific implementation, a safety valve is further provided on the liquid hydrogen tank to ensure the safety of the liquid hydrogen tank.

[0023] Working process:

[0024] When the fuel cell system starts, the hydrogen system controller collects the hydrogen storage tank liquid level L and the hydrogen storage pressure sensor value P1 in real time, and the fuel cell FCU controller collects the hydrogen injector switch frequency PWM value and the gas supply pressure sensor value P2 in real time; the hydrogen storage tank liquid level L change value AL and the hydrogen storage pressure sensor differential pressure AP1 in time t are accumulated and calculated, the liquid hydrogen consumption Q1 is calculated according to the liquid level change AL and the differential pressure AP1; the hydrogen consumption rate V1 is calculated according to the hydrogen injector switch frequency PWM value and the gas supply pressure sensor value P2, and then the hydrogen consumption Q2 in time t is calculated; the values of Q1 and Q2 are compared, when the difference is within the set threshold, it is judged that the system is working normally, when the difference exceeds the reasonable threshold, the system is abnormal, prompting the need for maintenance.

[0025] The hydrogen consumption measuring device of the liquid hydrogen fuel cell system of the application realizes the measurement of the hydrogen consumption at the end of the liquid hydrogen tank through the combination of the liquid level sensor and the liquid hydrogen tank pressure, realizes the measurement of the hydrogen consumption in front of the stack through the hydrogen injector front pressure sensor, compares the measurement values of the two sets of measuring devices, outputs the final measurement value and judges the working condition of the system, accurately calculates the hydrogen consumption, meets the real-time terminal demand of the system working condition, and improves the practicability of the fuel cell system.

[0026] Although the application has been described in detail in the foregoing with general description and specific embodiments, some modifications or improvements can be made on the basis of the application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the application, all belong to the scope of protection required by the application.

Claims

1. A hydrogen consumption measuring device for a liquid hydrogen fuel cell system, characterized in that: The measuring device includes a liquid level sensor installed inside the liquid hydrogen tank, a liquid hydrogen tank pressure sensor (P1), and a hydrogen injector installed at the fuel cell input port. A pressure sensor (P2) is also installed in front of the hydrogen injector. The hydrogen injector is connected to the hydrogen output control valve of the liquid hydrogen tank via a heat exchanger. The hydrogen output control valve, heat exchanger, pressure sensor (P2) and hydrogen injector are arranged in sequence. The liquid hydrogen tank, hydrogen output control valve, liquid level sensor, liquid hydrogen tank pressure sensor (P1), and heat exchanger are controlled by the hydrogen system controller; the pressure sensor (P2), hydrogen injector, and fuel cell stack are controlled by the fuel cell controller. The hydrogen system controller measures the amount of hydrogen consumed per unit time by collecting signals from the liquid level sensor and the liquid hydrogen tank pressure sensor (P1), and sends the measurement information to the fuel cell controller. The fuel cell controller measures the hydrogen flow rate per unit time by acquiring the signal from the pressure sensor (P2), compares it with the hydrogen consumption data sent by the hydrogen system controller, and issues the final hydrogen consumption measurement value and system operation status diagnostic information. Both the hydrogen system controller and the fuel cell controller are powered by batteries. The liquid hydrogen tank is also equipped with a safety valve to ensure the safety of the liquid hydrogen tank.

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