Method for calculating charging electric quantity before coal mine explosion-proof electric vehicle goes down well

Abstract

The invention provides a method for calculating the charging quantity of a coal mine explosion-proof electric vehicle before entering a well, and the method comprises the steps: obtaining the first-time charging quantity of a new vehicle entering the well through manual calculation according to the ramp length and angle of an auxiliary transportation inclined shaft and the parameters of the new vehicle; starting from the first underground operation of a new vehicle, accumulatively calculating the effective total braking electric quantity Qs of each underground operation by a battery management system of the explosion-proof electric vehicle, setting the effective total braking electric quantity Qs as the reserved empty electric quantity Qr of the next charging, and obtaining the reserved empty electric quantity correction value Q'r of the next charging according to the historical data of the reserved empty electric quantity Qr; calculating the actual capacity Qa of the battery pack during current charging according to the total charging electric quantity accumulated in the running process of the vehicle and the nominal attenuation parameter of the battery pack, reading the residual electric quantity QL of the battery pack before charging, and automatically calculating the charging electric quantity Qin required by the current charging according to the formula Qin = Qa * p-QL-Q'r. According to the method, on the premise that safe electric braking during downhill is guaranteed, the braking electric quantity generated in the downhill process can be recycled to the maximum extent, the maximum stroke of the vehicle can be guaranteed, labor is saved, and efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of charging management of explosion-proof electric vehicles in coal mines, in particular to a method for calculating charging power of explosion-proof electric vehicles in coal mines before going down a mine. Background technique [0002] Explosion-proof electric vehicles are one of the important transportation tools for coal mines. The explosion-proof electric vehicle needs to be charged in the explosion-proof electric garage before going down the well to ensure that the battery power can meet the travel required for the transportation task. Coal mines generally build the garage at the wellhead of the auxiliary transportation inclined shaft of the coal mine. When the explosion-proof electric vehicle is charged and driven out of the garage, it will first encounter a long distance of at least 5 kilometers to more than 10 kilometers in the auxiliary transportation inclined shaft. Slopes, explosion-proof elect...

AI Technical Summary

Problems solved by technology

At present, there are generally two methods to deal with the braking energy generated by the motor during electric braking: first, use the discharge resistor to consume the braking energy, but the explosion-proof electric vehicle has a heavy weight and load, and the slope distance is long. If the resistor consumes the braking energy, the heat generated by the discharging resistor is huge, and the surface temperature is extremely high, which does not meet the safety technical requirements of coal mine electrical appliances; second, the braking energy is used to charge the battery by energy recovery. Generally, the garage is built at the wellhead of the auxiliary transportation inclined shaft. If the vehicle is fully charged every time it is driven out, when the vehicle goes down the well, because the battery SOC (that is, the state of charge, is used to reflect the remaining capacity of the battery, its value is defined Because the ratio of the remaining capacity to the battery capacity) is high, the vehicle controller will prohibit energy recovery to protect the battery, making the electric brake invalid. In order to avoid this situation, it is necessary to reserve a part of the empty power for the battery when the vehicle is charging. Fully charged, it is specially used for recovering braking energy when the vehicle goes down the well. Cause electric brake to fail midway

Moreover, with the excavation of the mine, the ramp of the explosion-proof electric vehicle is dynamically extended. In actual production, the reserved battery capacity of the explosion-proof electric vehicle in the coal mine cannot be set to a fixed value. The number of charging and discharging increases, and the aging of the battery pack will also make its rated capacity change dynamically. Therefore, how to charge the explosion-proof electric vehicle reasonably before going downhill every time, so that it can maximize the braking power generated during the downhill process. It is an urgent issue for industry personnel to recycle efficiently and ensure the maximum travel distance of the vehicle.

At present, the method of charging explosion-proof electric vehicles in coal mines before going down the mine is: the vehicle maintenance personnel determine the amount of charging required for each explosion-proof electric vehicle before going down the mine based on experience. Use efficiency and there are certain security risks

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