Method for Controlling Vehicle Air-Conditioning System, and Vehicle Air-Conditioning System

Patent metadata

Field	Value
Publication number	US-2016200176-A1
Application number	US-201314904802-A
Country	US
Kind code	A1
Filing date	Jul 18, 2013
Priority date	Jul 18, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

A control method for a vehicle air-conditioning system and a vehicle air-conditioning system are provided. The control method comprises: acquiring an actual superheat degree, a preset superheat degree and an opening degree of an electronic expansion valve; and determining whether the electronic expansion valve is in a fault state or not according to the actual superheat degree, the preset superheat degree and the opening degree of the electronic expansion valve; if yes, outputting a control signal to an executive control mechanism to enable same to adjust a parameter of a device affecting a change of the actual degree of superheat in a vehicle air-conditioning system so as to adjust the superheat degree of the vehicle air-conditioning system.

First claim

1 . A control method for a vehicle air-conditioning system, comprising:
obtaining a determination result whether an electronic expansion valve is in a fault state according to a current opening degree of the electronic expansion valve, an actual superheat degree, and a preset superheat degree acquired while performing a superheat degree control, outputting a control signal to an executive mechanism according to the determination result; and adjusting, by the executive mechanism, a parameter of a device affecting change of the actual superheat degree in the vehicle air-conditioning system, to adjust the superheat degree of the vehicle air-conditioning system; or controlling, by the executive mechanism, turning off the compressor or the air-conditioning system.

2 . The control method for the vehicle air-conditioning system according to claim 1 , wherein in determining whether the electronic expansion valve is currently in the fault state, a first time span (t 1 ) is taken as a time determination period of the fault state to determine whether the electronic expansion valve is abnormal; and then a number of continuous abnormality times of the electronic expansion valve is accumulated;
determining that the electronic expansion valve is in the fault state, and outputting a control signal to the executive mechanism in the case that an accumulated number of continuous abnormality times is greater than or equal to a preset number of times; and outputting no control signal, by a control system, to the executive mechanism, and entering a next fault diagnosis cycle in the case that the accumulated number of continuous abnormality times is smaller than the preset number of times.

3 . The control method for the vehicle air-conditioning system according to claim 2 , wherein condition 1 is configured to be that the preset superheat degree minus the actual superheat degree is greater than a first fixed value and the current opening degree of the electronic expansion valve reaches a minimum value, and condition 2 is configured to be that the actual superheat degree minus the preset superheat degree is greater than a second fixed value and a current theoretical opening degree of the electronic expansion valve reaches a maximum value,
obtaining a determination result that the electronic expansion valve is in an abnormal state in the fault diagnosis cycle in the case that the vehicle air-conditioning system satisfies the condition 1 or the condition 2; and resetting the accumulated number of continuous abnormality times (n) of the electronic expansion valve in the case that the vehicle air-conditioning system satisfies neither the condition 1 nor the condition 2.

4 . The control method for the vehicle air-conditioning system according to claim 3 , wherein a determining and processing process of the fault state comprises the following steps:
S 01 , acquiring the opening degree of the electronic expansion valve, the actual superheat degree, and the preset superheat degree; S 021 , determining whether the preset superheat degree minus the actual superheat degree is greater than a first fixed value (w 1 ), performing step S 022 if the preset superheat degree minus the actual superheat degree is greater than the first fixed value (w 1 ), and performing step S 025 if the preset superheat degree minus the actual superheat degree is not greater than the first fixed value (w 1 ); S 022 , determining whether the opening degree of the electronic expansion valve reaches the minimum value; performing step S 023 if the opening degree of the electronic expansion valve reaches the minimum value, and performing step S 025 if the opening degree of the electronic expansion valve does not reach the minimum value; S 023 , adding 1 to the accumulated number of continuous abnormality times (n) of the valve; S 024 , determining whether the accumulated number of continuous abnormality times (n) is greater than or equal to a preset number of times (N); and if the accumulated number of continuous abnormality times (n) is greater than or equal to the preset number of times (N), determining that the electronic expansion valve is currently in the fault state and performing step S 03 , or simultaneously performing step S 05 ; S 025 , determining whether the actual degree of superheat minus the preset degree of superheat is greater than a second fixed value (w 2 ); and performing step S 026 if the actual degree of superheat minus the preset degree of superheat is greater than the second fixed value (w 2 ), and performing step S 05 and resetting the accumulated number of continuous abnormality times if the actual degree of superheat minus the preset degree of superheat is not greater than the second fixed value (w 2 ); S 026 , determining whether the opening degree of the electronic expansion valve reaches a maximum value, performing step S 023 and adding 1 to the accumulated number of continuous abnormality times (n) of the valve if the opening degree of the electronic expansion valve reaches the maximum value; and performing step S 03 if the accumulated number of continuous abnormality times (n) is greater than or equal to the preset number of times (N); and performing, step S 05 if the opening degree of the electronic expansion valve does not reach the maximum value; S 03 , outputting a control signal of fault of the electronic expansion valve to the executive mechanism according to the determination result; and S 05 , resetting the accumulated number of continuous abnormality times (n) of the valve.

5 . The control method for the vehicle air-conditioning system according to claim 3 , wherein the determining and processing process of the fault state comprises the following steps:
S 01 , acquiring the opening degree of the electronic expansion valve, the actual superheat degree, and the preset superheat degree; S 025 , determining whether the actual superheat degree minus the preset superheat degree is greater than a second fixed value (w 2 ); and performing step S 026 if the actual superheat degree minus the preset superheat degree is greater than the second fixed value (w 2 ), and performing step S 021 if the actual superheat degree minus the preset superheat degree is not greater than the second fixed value (w 2 ); S 026 , determining whether the opening degree of the electronic expansion valve reaches a maximum value; and performing step S 023 if the opening degree of the electronic expansion valve reaches the maximum value, and performing step S 021 if the opening degree of the electronic expansion valve does not reach the maximum value; S 023 , adding 1 to the accumulated number of continuous abnormality times (n) of the valve; S 021 , determining whether the preset superheat degree minus the actual superheat degree is greater than a first fixed value (w 1 ); and performing step S 022 if the preset superheat degree minus the actual superheat degree is greater than the first fixed value (w 1 ), and performing step S 05 and resetting the accumulated number of continuous abnormality times (n) if the preset superheat degree minus the actual superheat degree is not greater than the first fixed value (w 1 ); S 022 , determining whether the opening degree of the electronic expansion valve reaches a minimum value; and performing step S 023 and adding 1 to the accumulated number of continuous abnormality times (n) of the valve if the opening degree of the electronic expansion valve reaches the minimum value, and performing step S 05 and resetting the accumulated number of continuous abnormality times (n) if the opening degree of the electronic expansion valve does not reach the minimum value; S 024 , determining whether the accumulated number of continuous abnormality times (n) is greater than or equal to a preset number of times (N); and determin

Assignees

• Hangzhou Sanhua Res Inst Co Ltd
• Hangzhou Sanhua Res Inst Co Ltd

Inventors

• Stanke Edwin J
• Zhang Rongrong
• Tang Li
• Zhang Jun

Classifications

• F25B2600/2513

  Expansion valves · CPC title

• B60H2001/3267

  related to the operation of an expansion valve · CPC title

• B60H2001/3285

  related to an expansion unit · CPC title

• B60H1/3225

  characterised by safety arrangements, e.g. compressor anti-seizure means or by signalling devices · CPC title

• F25B49/02 Primary

  for compression type machines, plants or systems · CPC title