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CN-121976942-A - Three-section type starting method of automobile electric compressor under working condition of-40 DEG C

CN121976942ACN 121976942 ACN121976942 ACN 121976942ACN-121976942-A

Abstract

The invention relates to the technical field of automobile air conditioning systems, in particular to a three-section starting method of an automobile electric compressor under a working condition of minus 40 ℃, which comprises the following steps of conducting locked-rotor heating, controlling a compressor motor to be in a locked-rotor state, introducing locked-rotor current which is 0.3-0.7 times of rated current into the motor, heating lubricating oil in the compressor, a motor stator and a motor rotor through Joule heating, controlling the motor to run at a constant low speed of 250+/-20 revolutions per minute for 15+/-5 seconds after the locked-rotor heating is finished, pushing the lubricating oil to fully circulate in a compressor shell, controlling the motor to continuously rise at a rising speed of 100 revolutions per second for 6 seconds after the low-speed running is finished, controlling the motor to switch to a preset normal rotating speed, detecting the actual rotating speed of the motor in real time, judging that the starting is successful when the rotating speed reaches the control rotating speed, and enabling the compressor to enter a normal working mode.

Inventors

  • PENG JIE
  • ZUO XINQUAN
  • TAO PINGAN

Assignees

  • 重庆建设车用空调器有限责任公司

Dates

Publication Date
20260505
Application Date
20260303

Claims (7)

  1. 1. The three-stage starting method of the automobile electric compressor under the working condition of-40 ℃ is characterized by comprising the following steps of: The method comprises the steps of performing locked rotor heating, controlling a motor of a compressor to be in a locked rotor state, introducing locked rotor current which is 0.3-0.7 times of rated current of the motor, heating lubricating oil inside the compressor, a motor stator and a motor rotor through Joule heat, and monitoring in real time by an NTC sensor; after the locked rotor heating is finished, controlling the motor to run at a low speed, and pushing lubricating oil to sufficiently circulate in the compressor shell to run at the low speed; after the low-speed operation is finished, the motor is controlled to rise, then the motor is controlled to be switched to a preset normal rotation speed operation, the actual rotation speed of the motor is detected in real time, when the rotation speed reaches the control rotation speed, the starting is judged to be successful, and the compressor enters a normal working mode to perform the normal rotation speed operation.
  2. 2. The three-section starting method of an electric compressor of an automobile under the working condition of-40 ℃ as claimed in claim 1, wherein in the step of performing locked-rotor heating, controlling a motor of the compressor to be in a locked-rotor state, introducing locked-rotor current which is 0.3-0.7 times of rated current of the motor, heating lubricating oil inside the compressor, a stator and a rotor of the motor through joule heat, and monitoring in real time by an NTC sensor, wherein the method comprises the following steps: The temperature of the lubricating oil is raised from-40 ℃ to-15+/-2 ℃.
  3. 3. The three-section starting method of an electric compressor of an automobile under the working condition of-40 ℃ as claimed in claim 2, wherein in the step of performing locked-rotor heating, controlling a motor of the compressor to be in a locked-rotor state, introducing locked-rotor current which is 0.3-0.7 times of rated current of the motor, heating lubricating oil inside the compressor, a stator and a rotor of the motor through joule heat, and monitoring in real time by an NTC sensor, wherein the method comprises the following steps: The heating time of the temperature of the lubricating oil reaches 25+/-5 s.
  4. 4. The method for three-stage starting an electric compressor of an automobile under a working condition of-40 ℃ as claimed in claim 1, wherein after the heating to be locked-up is finished, the motor is controlled to run at a low speed, and lubricating oil is pushed to circulate in the shell of the compressor sufficiently, and the step of running at the low speed is carried out: The motor was run at a constant low speed of 250.+ -.20 rpm for 15.+ -.5 s.
  5. 5. The method for three-stage starting an electric compressor of an automobile under a working condition of-40 ℃ as claimed in claim 4, wherein after the heating to be locked-up is finished, the motor is controlled to run at a low speed, and lubricating oil is pushed to circulate in the shell of the compressor sufficiently, and the step of running at the low speed is carried out: the NTC sensor monitoring was raised to-12℃for 15s, ending the low-speed operation.
  6. 6. The method for three-stage starting an electric compressor of an automobile under a working condition of-40 ℃ as claimed in claim 1, wherein after the low-speed operation is finished, the motor is controlled to rise, then the motor is controlled to switch to a preset normal rotation speed operation, the actual rotation speed of the motor is detected in real time, when the rotation speed reaches the control rotation speed, the starting is judged to be successful, the compressor enters a normal working mode, and the normal rotation speed operation is carried out: the motor was continuously ramped for 6s at a ramp rate of 100 rpm.
  7. 7. The method for three-stage starting an electric compressor of an automobile under a working condition of-40 ℃ as claimed in claim 6, wherein after the low-speed operation is finished, the motor is controlled to rise, then the motor is controlled to switch to a preset normal rotation speed operation, the actual rotation speed of the motor is detected in real time, when the rotation speed reaches the control rotation speed, the starting is judged to be successful, the compressor enters a normal working mode, and the normal rotation speed operation is carried out: The preset normal rotation speed is set according to the type of the compressor, and the value is 800-8000 revolutions per minute.

Description

Three-section type starting method of automobile electric compressor under working condition of-40 DEG C Technical Field The invention relates to the technical field of automobile air conditioning systems, in particular to a three-section starting method of an automobile electric compressor under a working condition of-40 ℃. Background The automobile electric compressor is a core execution component of an automobile air conditioning system, and the starting performance of the automobile electric compressor directly determines the working reliability of the air conditioning system in a low-temperature environment. Under the extremely low temperature working conditions such as-40 ℃, the viscosity of the lubricating oil in the compressor can be rapidly increased, the fluidity is greatly reduced, meanwhile, the resistance of a motor stator winding is increased, the rotor rotation resistance is obviously increased, and the traditional direct start mode and the single low-speed start mode have a plurality of technical defects that the traditional start mode has insufficient output torque and cannot overcome the rotation resistance caused by the high viscosity of the lubricating oil, the start failure is extremely easy to occur, if the motor is forcedly started, the motor can generate large blocking current, the stator winding is easy to burn, meanwhile, the bearing is dry-rubbed due to insufficient lubrication of the lubricating oil, the irreversible mechanical damage is caused, and even if the compressor is started briefly, the operation vibration is large and the noise is high due to insufficient circulation of the lubricating oil, so that the whole service life of the compressor is greatly shortened. In the prior art, part of the schemes adopt single locked-rotor heating or single low-speed starting, but the locked-rotor heating time is too long, local overheating is easy to cause, the viscosity of lubricating oil cannot be quickly reduced by single low-speed starting, and reliable starting cannot be realized under the working condition of-40 ℃. In summary, it is necessary to provide a three-stage starting method for an automotive electric compressor under the working condition of-40 ℃ in which the compressor is efficiently, safely and reliably started at extremely low temperature. Disclosure of Invention The invention aims to provide a three-section starting method of an automobile electric compressor under the working condition of-40 ℃ so as to achieve the effects of high-efficiency, safe and reliable starting of the compressor under the extremely low temperature. In order to achieve the above purpose, the three-stage starting method of the automobile electric compressor under the working condition of-40 ℃ comprises the following steps: The method comprises the steps of performing locked rotor heating, controlling a motor of a compressor to be in a locked rotor state, introducing locked rotor current which is 0.3-0.7 times of rated current of the motor, heating lubricating oil inside the compressor, a motor stator and a motor rotor through Joule heat, and monitoring in real time by an NTC sensor; after the locked rotor heating is finished, controlling the motor to run at a low speed, and pushing lubricating oil to sufficiently circulate in the compressor shell to run at the low speed; after the low-speed operation is finished, the motor is controlled to rise, then the motor is controlled to be switched to a preset normal rotation speed operation, the actual rotation speed of the motor is detected in real time, when the rotation speed reaches the control rotation speed, the starting is judged to be successful, and the compressor enters a normal working mode to perform the normal rotation speed operation. The method comprises the following steps of performing locked rotor heating, controlling a compressor motor to be in a locked rotor state, introducing locked rotor current which is 0.3-0.7 times of rated current of the motor, heating lubricating oil in the compressor, a motor stator and a motor rotor through Joule heat, and monitoring in real time by an NTC sensor: The temperature of the lubricating oil is raised from-40 ℃ to-15+/-2 ℃. The method comprises the following steps of performing locked rotor heating, controlling a compressor motor to be in a locked rotor state, introducing locked rotor current which is 0.3-0.7 times of rated current of the motor, heating lubricating oil in the compressor, a motor stator and a motor rotor through Joule heat, and monitoring in real time by an NTC sensor: The heating time of the temperature of the lubricating oil reaches 25+/-5 s. After the heating to be blocked is finished, the motor is controlled to run at a low speed, so that lubricating oil is pushed to circulate fully in the shell of the compressor, and the low-speed running is carried out: The motor was run at a constant low speed of 250.+ -.20 rpm for 15.+ -.5 s. After the heating to be blocked is finished, the