Method and system for starting ice-breaking without position control of air compressor

Abstract

The invention discloses a method and system for starting an air compressor without position control to break ice. The method includes: under a given rotational speed command value, using open-loop control to control the motor rotor to perform forward and reverse rotation according to a set flip logic, and start breaking ice ;As the ice is broken, the real-time rotating speed of the motor rotor changes, and the voltage of the given motor is in a state of change under open-loop control; the three-phase current of the motor is detected, and when the voltage is constant for a period of time, the voltage of the motor is determined by the motor voltage equation Calculate the real-time speed of the motor rotor during this period; compare the real-time speed with the given speed command value, and if the difference is within the allowable range, it is judged that the ice-breaking is successful, otherwise it is judged that the ice-breaking is not successful. Using the motor control method and system of the present invention, the air compressor can effectively complete the ice-breaking task in extremely cold weather and freezing conditions, and can judge whether the ice-breaking is successful or not by self-checking and give feedback whether the next step is normal Start working.

Description

technical field [0001] The invention relates to the technical field of air compressor control, in particular to an air compressor non-position control ice breaking start method and system. Background technique [0002] The air compressor for fuel cell vehicles can provide high-pressure air for the cathode reaction of the fuel cell, and provide clean air with the required pressure and flow rate for the fuel cell according to the power demand. Its performance directly affects the performance of the fuel cell system. A typical fuel cell air supply system consists of an air filter, air compressor, motor, intercooler, humidifier, and expander. The air compressor is very important for fuel cell vehicles, and the role played by the motor in the air compressor is even more important. Generally, a high-speed motor is directly driven and connected to the impeller, which can effectively reduce the energy consumption of the air compressor. High-speed motors are not only expensive due t...

AI Technical Summary

Problems solved by technology

High-speed motors are not only expensive due to high-precision and high-resolution position / speed sensors, but also their performance will be affected in harsh environments such as extremely high speed, high temperature, and humidity

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