Method for Controlling Degree of Superheat of Vehicle Air-Conditioning System, and Vehicle Air-Conditioning System

Patent metadata

Field	Value
Publication number	US-2016159198-A1
Application number	US-201314905066-A
Country	US
Kind code	A1
Filing date	Jul 18, 2013
Priority date	Jul 18, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

A method for controlling a superheat degree of a vehicle air-conditioning system, and a vehicle air-conditioning system are provided. The method comprises: acquiring an actual superheat degree in real time, a preset superheat degree and a feed-forward information which influences a change of the actual superheat degree; and adjusting an opening degree of an electronic expansion valve in real time according to the actual superheat degree, the preset superheat degree and the feed-forward information that are acquired, so as to control the superheat degree of the vehicle air-conditioning system.

First claim

1 . A method for controlling a superheat degree of a vehicle air-conditioning system, comprising:
acquiring, by a control system in a real time manner, an actual superheat degree, a preset superheat degree, and a feed forward information affecting the actual superheat degree; and adjusting an opening degree of an electronic expansion valve in real time according to the actual superheat degree, the preset superheat degree and the feed forward information acquired to control the superheat degree of the vehicle air-conditioning system.

2 . The method for controlling the superheat degree of the vehicle air-conditioning system according to claim 1 , wherein the feed forward information comprises:
a change of a rotational speed and/or a displacement of a compressor; and/or a change of a rotational speed of an evaporator fan.

3 . The method for controlling the superheat degree of the vehicle air-conditioning system according to claim 2 , wherein the step of, adjusting the opening degree of the electronic expansion valve in real time according to the actual superheat degree, the preset superheat degree and the feed forward information to control the superheat degree of the vehicle air-conditioning system, comprises:
comparing the actual superheat degree acquired with the preset superheat degree acquired to obtain a difference value of the superheat degree, and acquiring a corresponding first adjustment amount of the opening degree of the electronic expansion valve according to the difference value of the superheat degree; acquiring a corresponding second adjustment amount of the opening degree of the electronic expansion valve according to a change information of the rotational speed or the displacement of the compressor, and/or a change information of the rotational speed of the evaporator fan; and adjusting the opening degree of the electronic expansion valve according to the first adjustment amount of the opening degree of the electronic expansion valve and the second adjustment amount of the opening degree of the electronic expansion valve.

4 . The method for controlling the superheat degree of the vehicle air-conditioning system according to claim 3 , wherein:
the first adjustment amount V out 1 of the opening degree of the electronic expansion valve is calculated by the following formula:

V
out


1

=

K
p

×
e

+

K
d

×


e


t

+

K
i

×

∫
n
t



e



t

+
C

,

in the formula, e is a difference value of superheat degree between the actual superheat degree and the preset superheat degree, K p is a proportionality coefficient, K d is a differential coefficient, K i is an integral coefficient, and C is a correction coefficient;
the second adjustment amount V out 2 of the opening degree of the electronic expansion valve is any one of or the sum of a first part V out 21 of the second adjustment amount of the opening degree of the electronic expansion valve, and a second part V out 22 of the second adjustment amount of the opening degree of the electronic expansion valve; wherein the first part V out 21 of the second adjustment amount of the opening degree of the electronic expansion valve is calculated by the following formula:

V
out


21

=

K
CS

×


CS


t

,

or the formula:

V
out


21

=

K
CD

×


CD


t

,

or the formula:

V
out


21

=

K
CS

×


CS


t

+

K
CD

×


CD


t

,

and the second part V out 22 of the second adjustment amount of the opening degree of the electronic expansion valve is calculated by the following formula:

V
out


22

=

Assignees

• Hangzhou Sanhua Res Inst Co Ltd

Inventors

• Tang Li
• Zhang Rongrong
• Stanke Edwin J

Classifications

• G05D23/1393

  characterised by the use of electric means · CPC title

• B60H2001/3272

  to control the revolving speed of a compressor · CPC title

• B60H2001/3267

  related to the operation of an expansion valve · CPC title

• B60H2001/3282

  to control the air flow · CPC title

• B60H1/00978

  Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods · CPC title