Fire-measuring device, method, and application of electric vehicles in garage

A method of using a fire measuring device for an electric vehicle in a garage, comprising the following steps:

• S1, placing four mass sensor pads of a vehicle mass acquisition mechanism on a garage floor, wherein the four mass sensor pads correspond to four tires of the electric vehicle;
• driving the electric vehicle into the garage, and making the four tires of the electric vehicle park on the four mass sensor pads;
• then after determining experimental conditions, deciding charging the electric vehicle to a fixed amount of an electricity or letting the electric vehicle in a charging state according to the experimental conditions;
• S2, elongating a first telescopic ceramic tube of a first temperature acquisition unit at a roof of the electric vehicle and a second telescopic ceramic tube of a second temperature acquisition unit at a headstock of the electric vehicle according to a height of the electric vehicle, and then adjusting a height of a third telescopic ceramic tube of a third temperature acquisition unit inside the electric vehicle on a seat according to a position of a measuring point, using a opening and closing controller to make an U-shaped bracket at a bottom of the electric vehicle in a vertical state, and opening a thermocouple test software to check whether all thermocouples are in a normal operation, after replacing any thermocouple in an abnormal state, repeatedly checking any newly installed thermocouple until all newly installed thermocouples are in the normal operation and closing the thermocouple test software;
• S3, adjusting a position of an infrared thermal imager, a position of a high-speed camera, and a position of a radiation heat flow meter respectively according to a position of the electric vehicle, and then turning on a computer, the infrared thermal imager, the high-speed camera, the radiation heat flow meter, gas flow rate sensors, a gas analyzer, and the opening and closing controller to check whether each part of the fire measuring device is in a normal state, and calibrating the gas flow rate sensors in need of being calibrated, and then turning on a test and analysis software matching the each part in the computer to test whether the each part is in a normal working state;
• if the each part is not in the normal working state, conducting debugging and repairing;
• if the each part is in the normal working state, conducting a next step.
• S4, igniting the electric vehicle and recording a fire process temperature, infrared images, video images, a radiation heat flow, a gas flow rate, a gas composition, and a gas concentration in real-time;
• S5, after finishing the testing, using a water gun fire extinguishing mechanism to cool a body of the electric vehicle to prevent a re-ignition and clear a fire residue out of the garage;
• recycling the third temperature acquisition unit inside the electric vehicle on the seat for a subsequent use;
• at the same time, contracting the first telescopic ceramic tube of the first temperature acquisition unit at the roof of the electric vehicle and the second telescopic ceramic tube of the second temperature acquisition unit at the headstock of the electric vehicle back to an interior of a garage wall;
• using the opening and closing controller to collect a temperature acquisition unit for the bottom of the electric vehicle in a garage floor groove;
• S6. exporting experimental data to the computer and analyzing the experimental data by the computer, i.e., calculating a heat release rate of the electric vehicle according to a thickness of a flue gas layer recorded by the high-speed camera, a flue gas velocity recorded by a gas flow meter, and a concentration of oxygen, a concentration of carbon monoxide, and a concentration of carbon dioxide recorded by the gas analyzer;
• at the same time, judging a risk of the electric vehicle igniting surrounding cars and combustibles according to data of the radiation heat flow meter, judging a temperature change of each point in a fire development process and a fire process according to data of the thermocouples and data of the infrared thermal imager;
• and
• S7, by changing a fire ignition mode, a vehicle type, a charging capacity, a charging state, and whether using a water gun fire during a fire evolution process, repeating the steps S1 to S6 to determine a fire evolution pattern and a fire risk of the electric vehicle under different scenarios.