CN103033008B - The method of controlling an electronic expansion valve of an automobile air conditioning system - Google Patents

The method of controlling an electronic expansion valve of an automobile air conditioning system Download PDF

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CN103033008B
CN103033008B CN201110298313.6A CN201110298313A CN103033008B CN 103033008 B CN103033008 B CN 103033008B CN 201110298313 A CN201110298313 A CN 201110298313A CN 103033008 B CN103033008 B CN 103033008B
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expansion valve
electronic expansion
degree
compressor
superheat
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CN201110298313.6A
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CN103033008A (en
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张荣荣
爱德文·约翰·斯坦科
唐立
席卫东
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杭州三花研究院有限公司
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Abstract

本发明公开一种汽车空调系统电子膨胀阀的控制方法,按照如下步骤进行:A.启动控制;判断系统启动状态:热启动状态下,直接执行步骤B;冷启动状态下,调节电子膨胀阀至全闭后再开启至小开度,之后执行步骤B;B.运行控制;在压缩机启动初始阶段,控制电子膨胀阀达到与压缩机的转速相对应的恒定开度,以与压缩机的转速相对应的所述恒定开度进入正常运行阶段控制;C.停机控制。 It discloses an automotive air conditioning system control method of the present invention, an electronic expansion valve, according to the following steps: A start control; Analyzing System startup state: a warm start, perform Step B; the cold start state, the electronic expansion valve to fully closed before opening to a small opening degree, after performing step B;. B operation control; the initial stage of starting the compressor, controlling the compressor and the electronic expansion valve to achieve a constant rotational speed corresponding to the opening degree, the rotational speed of the compressor to constant corresponding to the opening degree of the control into the normal operation phase;. C shutdown control. 本发明能够可靠地适应汽车空调系统的运行工况复杂、工况变化速度快的特点,快速、准确控制蒸发器出口或压缩机进口的过热度,有效提高系统的节能效果。 The present invention can reliably accommodate automotive air conditioning system operating conditions complicated, fast changing nature of working conditions speed, fast, accurate control of the compressor inlet or outlet of the evaporator superheat, improve energy saving performance of the system.

Description

一种汽车空调系统电子膨胀阀的控制方法 The method of controlling an electronic expansion valve of an automobile air conditioning system

技术领域 FIELD

[0001] 本发明涉及制冷控制技术,具体涉及一种汽车空调系统电子膨胀阀的控制方法。 [0001] The present invention relates to refrigeration control technology, particularly relates to an automobile air conditioning system control method of an electronic expansion valve.

背景技术 Background technique

[0002] 众所周知,在汽车系统中,汽车空调是主要的能源消耗单位,随着整车节能要求的提高,汽车空调的节能也逐步被提出。 [0002] It is well known in automotive systems, automotive air conditioning is a major energy consumption per unit, with the improvement of the energy requirements of the vehicle, the car air-conditioning energy conservation have gradually been proposed. 特别是在电动汽车系统中,由于电池的容量有限,汽车的续航里程受到限制。 Especially in electric vehicle system, due to the limited capacity of the battery, the car's mileage is limited. 因此,电动汽车空调的节能显得尤为重要。 Therefore, the electric car air-conditioning energy saving is very important.

[0003] 在汽车空调系统中,有效控制系统制冷剂流量,使得系统发挥最优的效能,是系统能否节能的关键所在。 [0003] In the automotive air conditioning system, refrigerant flow control system effectively, so that the system plays the best performance, is the key to energy saving system can. 具体到电动汽车空调,由于压缩机可以变速调节,工况变化范围大, 须使用电子膨胀阀精确调节制冷剂的流量,以适应压缩机的流量变化要求。 Specific to the electric car air conditioner, since the compressor can be adjusted shift, changes in range conditions, the flow rate of the refrigerant to be precisely adjusted using the electronic expansion valve, to adapt to changes in the flow requirements of the compressor. 显然,电子膨胀阀本身只是一个执行部件,需要一个合理的控制逻辑来准确调整膨胀阀的开度,使得系统达到性能优化、并可靠运行。 Obviously, electronic expansion valve itself is only one execution unit, a reasonable control logic required to accurately adjust the opening degree of the expansion valve, so that the system as a performance optimization, and reliable operation.

[0004] 依据汽车空调系统运行的整个过程进行划分,电子膨胀阀的控制大体上包括启动、运行控制及停机等几个阶段。 [0004] The entire process is divided according to the automotive air conditioning system, controlling the electronic expansion valve generally comprises several stages of startup, operation and shut-down control. 对于完整的控制逻辑而言,其中,启动控制精度将影响过热度控制过程中流量调节的基准精度,过热度控制阶段为影响能耗调节的关键阶段,直接影响空调系统的节能控制精度,而停机控制精度将影响下一个制冷周期过热度控制过程中流量调节的精度。 For the complete control logic terms, which will affect the accuracy of the start control process of controlling the degree of superheat is adjusted based on the accuracy of the flow rate, degree of superheat control phase adjustment is a critical stage of impact energy, the energy saving control directly affects the accuracy of the air conditioning system, downtime the control accuracy of a refrigeration cycle under the influence of the degree of superheating control process flow control accuracy.

[0005] 有鉴于此,亟待针对汽车空调系统电子膨胀阀的提出一种合理、有效的控制方法, 以最大限度的满足能耗调节的技术要求。 [0005] In view of this, an air conditioning system for automotive urgent electronic expansion valve to provide a reasonable and effective control method to maximize the power consumption adjustment meet technical requirements.

发明内容 SUMMARY

[0006] 针对上述缺陷,本发明解决的技术问题在于提供一种汽车空调系统电子膨胀阀的控制方法,以快速、准确控制蒸发器出口或压缩机进口的过热度,有效降低系统能耗。 [0006] For the above disadvantages, the present invention is to solve the technical problem is to provide a method for controlling an electronic expansion valve automotive air conditioning system to quickly and accurately control the degree of superheat of the evaporator outlet or inlet of the compressor, reduce system power consumption.

[0007] 本发明提供的汽车空调系统电子膨胀阀的控制方法,包括如下步骤: [0007] The method of controlling an electronic expansion valve automotive air conditioning systems of the present invention provides, comprising the steps of:

[0008] A.启动控制;判断系统启动状态:热启动状态下,直接执行步骤B;冷启动状态下, 调节电子膨胀阀至全闭;再开启至小开度,之后执行步骤B; [0008] A. start control; Analyzing System startup state: state, direct hot start step B; cold start, electronic expansion valve to the fully closed; opening to a small opening degree and then, after performing step B;

[0009] B.运行控制;在压缩机启动初始阶段,控制电子膨胀阀达到与压缩机的转速相对应的恒定开度,以与压缩机的转速相对应的所述恒定开度进入正常运行阶段控制; [0009] B. Control operation; start at the initial stage of the compressor, the control electronic expansion valve and the compressor speed to achieve a constant degree of opening corresponding to the rotational speed of the compressor corresponding to a constant degree of opening into the normal operating phase control;

[0010] C.停机控制。 [0010] C. shutdown control.

[0011]优选地,步骤A中,冷启动状态下,所述小开度具体为所述电子膨胀阀全开度的2% ~20%〇 [0011] Preferably, the step A, the cold start state, specifically to the small opening degree of the electronic expansion valve is fully opened from 2% to 20% of the square

[0012] 优选地,步骤A中,冷启动状态下,调节电子膨胀阀至全开后,调节电子膨胀阀至全闭;并以所述电子膨胀阀在第一时间长度内完成全开及全闭为条件,调节电子膨胀阀开启至小开度。 [0012] Preferably, the step A, the cold start state, the electronic expansion valve to fully open, electronic expansion valve to the fully closed; and to the electronic expansion valve in a fully open and a length of time to complete a first full closed condition, electronic expansion valve opening degree to a small opening.

[0013] 优选地,步骤B中,将所述压缩机的转速划分多个转速区间,并根据每个转速区间的压缩机转速确定相对应的所述电子膨胀阀的恒定开度。 [0013] Preferably, the step B, the rotational speed of the compressor is divided into a plurality of speed range, and a constant corresponding to the determined opening degree of the electronic expansion valve in accordance with the compressor speed to each speed range.

[0014] 优选地,步骤B中,在压缩机启动初始阶段,在启动时间段内判断所述压缩机的转速是否在一定时间区间内保持在一个转速区间内,若是,则控制所述电子膨胀阀达到与相应转速区间相对应的恒定开度;若否,则控制所述电子膨胀阀达到启动时间段结束时刻的所述压缩机转速所在转速区间相对应的恒定开度,或者控制所述电子膨胀阀达到预设的初始启动开度。 [0014] Preferably, step B, starting at the initial stage of the compressor, the starting period of the compressor determines whether the rotational speed remains within a speed range in a certain time interval, and if yes, the electronic expansion control valve reaches a speed corresponding to the interval corresponding to the constant degree of opening; if not, then control the electronic expansion valve reaches the starting end of the period of time where the rotational speed of the compressor speed range corresponding to the constant opening degree, the electronic control or the expansion reaches a preset valve opening degree of the initial startup.

[0015] 优选地,在压缩机启动初始阶段的启动时间段后,以所述压缩机的转速自第一转速区间变化至第二转速区间内,且维持第二时间长度为条件,控制所述电子膨胀阀自与所述第一转速区间所对应的恒定开度达到与所述第二转速区间所对应的恒定开度。 [0015] Preferably, after the initial startup period starts the compressor stage, rotational speed of the compressor section to change from the first speed to the second speed range, and the length of the sustain time of the second condition, the control of the electronic expansion valve from said first constant speed range corresponding to a constant degree of opening and the opening degree corresponding to the second speed range.

[0016] 优选地,步骤B中,在所述正常运行阶段控制,根据所述压缩机的转速确定所述电子膨胀阀的开度预调节量so,根据蒸发器出口或者压缩机进口的制冷剂温度和压力计算实际过热度Tsh,并将所述实际过热度与预设的过热度阈值区间Tsh_set进行比较,获得开度调节增量A s;将所述开度预调节量so与所述开度调节增量△ s累加后输出调节开度的控制信号s至所述电子膨胀阀的控制端。 [0016] Preferably, step B, the normal operating phase control, the rotational speed of the compressor is determined that the opening degree of the electronic expansion valve preconditioning amount so, according to the evaporator outlet or inlet of the refrigerant compressor temperature and pressure to calculate the actual degree of superheat Tsh, and the actual degree of superheat to a preset degree of superheat threshold comparing section Tsh_set obtained opening degree adjustment increment a s; the degree of opening of the pre-opening adjustment amount so after adjustment output adjustment increment △ accumulation control signal s s opening degree to the control terminal of the electronic expansion valve.

[0017] 优选地,所述过热度阈值区间以基本过热度阈值曲线为基准形成一个封闭区间, 正常过热度设定范围内的所述过热度阈值区间由基本过热度阈值曲线上下浮动一温度定值形成;过热度为〇°C时的所述过热度阈值区间设定为0°C;过热度大于20°C时的所述过热度阈值区间设定为〇°c。 [0017] Preferably, the degree of superheat threshold value interval substantially superheat threshold curve is formed as a reference a block section, the degree of superheat threshold value interval within the normal superheat setting range of floating a temperature determined by the basic superheat threshold curve down value is formed; the superheat threshold period when the degree of superheat of square ° C Setpoint to 0 ° C; the superheat threshold interval 20 is greater than when the degree of superheat of square ° C Setpoint ° c.

[0018] 优选地,低负荷区和高负荷区的过热度阈值区间均小于等于正常负荷区的过热度阈值区间;所述低负荷区的过热度越低过热度阈值区间越小,所述高负荷区的过热度越高过热度阈值区间越小。 [0018] Preferably, the degree of superheat threshold value interval low load region and the high load region are less than or equal superheat threshold interval normal load region; the lower the low-load area superheat degree is smaller superheat threshold range, the high the higher the degree of superheat of the superheat region smaller load threshold value interval.

[0019] 优选地,将所述压缩机的转速划分多个运行区间,并根据每个运行区间的压缩机转速确定相应的所述电子膨胀阀的开度预调节量SO。 [0019] Preferably, a plurality of dividing the rotation speed operation region of the compressor, and determines the corresponding degree of opening of the electronic expansion valve according to a pre-adjusted amount of SO compressor rotating speed of each of the operation period.

[0020] 优选地,以所述压缩机的转速满足在相应运行区间内维持第三时间长度为条件, 根据所述压缩机的转速确定所述电子膨胀阀的开度预调节量so。 [0020] Preferably, the compressor rotational speed is maintained to meet the length of the third time interval in the respective operating conditions, determining the degree of opening of the electronic expansion valve so the amount of preconditioning the rotational speed of the compressor.

[0021] 优选地,步骤C中,判断系统停机状态:热停机状态下,调节电子膨胀阀至全闭;冷停机状态下,调节电子膨胀阀开启至小开度 [0021] Preferably, step C, the stop state is determined the system: the thermal shutdown state, electronic expansion valve to the fully closed; cold shutdown state, electronic expansion valve opening degree to a small opening

[0022] 优选地,步骤C中,调节电子膨胀阀开启至全开度后至全闭;并以所述电子膨胀阀在第四时间长度内完成全开及全闭为条件,调节所述电子膨胀阀开启至小开度。 [0022] Preferably, step C, the electronic expansion valve is opened to the fully closed to fully open degree; and at the completion of electronic expansion valve is fully opened and fully closed conditions in a fourth length of time, adjusting the electronic expansion valve opening degree to a small opening.

[0023] 优选地,步骤C中,所述小开度为电子膨胀阀全开度的10%_40%。 [0023] Preferably, step C, the small opening degree of 10% _40% of the electronic expansion valve is fully open.

[0024] 优选地,步骤C中,以LIN信号的信息获得热停机状态或者冷停机状态的判断结果。 [0024] Preferably, step C, to obtain the information signal LIN thermal shutdown state or a cold shutdown state determination result.

[0025] 本发明提供的汽车空调系统电子膨胀阀的控制方法包括三个主要步骤:启动控制、运行控制和停机控制。 Automotive air conditioning system control method of an electronic expansion valve provided herein [0025] This involves three main steps: startup control, shutdown control, and operational control.

[0026] 其中,在启动控制过程中,冷启动状态下首先调节电子膨胀阀至全闭,由于该控制过程以全闭状态为调苄基准,可以准确计算开启脉冲数,为汽车空调系统的能耗调节提供了可靠的保障;然后再调节电子膨胀阀开启至小开度,如此设计,可以保持一个小开度的可避免压缩机启动时系统产生过大的流量,冲击压缩机,造成压缩机过载;同时,电子膨胀阀保持一个小开度有利于汽车空调系统尽快建立高低压端的压力差,进入正常制冷、制热循环。 [0026] wherein, in the start control process, cold start first electronic expansion valve in a state to the fully closed, since the control procedure to the fully closed state to adjust a benzyl reference, can accurately calculate the open pulse number, automotive air-conditioning system can consumption adjusted to provide a reliable protection; then electronic expansion valve opening degree to a small opening, so the design, a small opening may be kept in the system compressor starts can be avoided excessive flow, the impact of the compressor, resulting in compressor overload; the same time, maintaining a small electronic expansion valve opening degree of the automotive air conditioning system is conducive to the establishment of a pressure difference between the high and low end as soon as possible into the normal cooling and heating cycle.

[0027] 其中,在运行控制过程中,本方法在压缩机启动初始阶段根据压缩机的转速将电子膨胀阀的开度调整至一恒定开度,并以与压缩机的转速相对应的所述恒定开度进入正常运行控制阶段。 [0027] wherein, in the operation control process, the process will start the initial phase of opening of the electronic expansion valve opening degree is adjusted to a constant rotational speed of the compressor in the compressor, the compressor and a rotation speed corresponding to the constant opening degree control phase into the normal operation. 如此设置,恒定的开启度能保证电子膨胀阀的开度能够处于较为稳定的状态,使得启动初始阶段的膨胀阀处于稳定工作状态下,从而可有效避免大的扰动给膨胀阀带来的影响,确保系统的正常、高效的运行。 Thus set, to ensure a constant degree of opening of the electronic expansion valve opening degree can be in a more stable state, so that the initial stage of the start of the expansion valve is in steady state, which can effectively avoid the effects of large disturbance brought to the expansion valve, ensure that the system of normal, efficient operation.

[0028] 本发明提供的汽车空调系统电子膨胀阀的控制方法适用于不同形式的汽车空调系统,特别适用于电动汽车空调系统。 [0028] The method of controlling an electronic expansion valve automotive air conditioning systems of the present invention provides for different forms of automotive air conditioning systems, especially for electric automotive air conditioning system.

附图说明 BRIEF DESCRIPTION

[0029] 图1是具体实施方式中所述汽车空调系统电子膨胀阀的控制方法的流程框图; [0030]图2示出了本发明冷启动状态控制的第一实施例的流程框图; [0029] FIG. 1 is a block flow diagram of a specific embodiment of the automotive air conditioning system control method of the electronic expansion valve; [0030] FIG. 2 shows a flow diagram of a first embodiment of the present invention is a cold start state of the control of the embodiment;

[0031] 图3示出了本发明冷启动状态控制的第二实施例的流程框图; [0031] FIG. 3 shows a flow diagram of a second embodiment of the present invention is the control of a cold start condition;

[0032] 图4示出了运行控制阶段的第一实施例的流程框图; [0032] FIG. 4 shows a flow diagram of a first embodiment of a control stage operation;

[0033] 图5示出了运行控制阶段的第二实施例的流程框图; [0033] FIG. 5 shows a flow diagram of a second embodiment of a control stage operation;

[0034]图6示出了一种具体实施方式中在启动初始阶段所述压缩机转速区间的划分及其与电子膨胀阀开度之间的对应关系; [0034] FIG. 6 shows a correspondence relationship between a specific embodiment in an initial stage of starting the compressor speed range is divided, and the electronic expansion valve opening degree;

[0035] 图7示出了一种具体实施方式中所述正常运行阶段的过热度控制逻辑关系示意图; [0035] FIG. 7 shows a schematic diagram of a specific embodiment the degree of superheat in the normal operating phase of the control logic;

[0036] 图8为一种具体实施方式中所述正常运行阶段的过热度控制流程图; [0036] FIG. 8 is a specific embodiment the degree of superheat in the normal operating phase of a control flowchart;

[0037] 图9为一种具体实施方式中所述过热度阈值区间与基本过热度阈值的关系曲线示意图; [0037] FIG. 9 is a schematic diagram of the relationship between threshold interval substantially superheat threshold curve in a specific embodiment the degree of superheat;

[0038]图10是本发明第一实施例所述停机控制阶段的流程框图; [0038] FIG. 10 is a first embodiment of the present invention block flow diagram of the phase control stop;

[0039]图11是本发明第二实施例所述停机控制阶段的流程框图; [0039] FIG. 11 is a block flow diagram of the phase control stop a second embodiment of the present invention;

[0040] 图12是本发明第三实施例所述停机控制阶段的流程框图。 [0040] FIG. 12 is a flow diagram of a third embodiment of the phase control stop according to the present invention.

具体实施方式 Detailed ways

[0041] 本发明的核心是提供一种汽车空调系统电子膨胀阀的控制方法,以可靠地适应汽车空调系统的运行工况复杂、工况变化速度快的特点,快速、准确控制蒸发器出口或压缩机进口的过热度,有效提高系统的节能效果。 [0041] The core of the invention is to provide an automotive air conditioning system control method of the electronic expansion valve, in order to reliably accommodate automotive air conditioning system operating conditions complicated, fast changing nature of working conditions speed, fast, accurate control of the evaporator outlet or superheat degree of the compressor inlet, effectively improve the energy saving effect of the system. 下面结合说明书附图具体说明本实施方式。 The following detailed description in conjunction with the accompanying drawings of the present embodiment.

[0042] 请参见图1,该图示出了本实施方式所述汽车空调系统电子膨胀阀的控制方法的流程框图。 [0042] Referring to FIG. 1, which shows a flow diagram of the automotive air conditioning system control method of an electronic expansion valve of the present embodiment.

[0043]如图所示,该汽车空调系统电子膨胀阀的控制方法包括三个主要步骤:启动控制A、运行控制B和停机控制C,以基于汽车空调系统的运行工况复杂、工况变化速度快,在不同控制阶段进行有效控制。 [0043] As shown, the automotive air conditioning system control method of an electronic expansion valve comprises three main steps: Start Control A, a control operation and shutdown control C B, based on the operating conditions of the automotive air conditioning system complexity, operating conditions change fast, effective control at various stages of control.

[0044]其中,步骤A中,首先判断系统启动状态(热启动或者冷启动),再根据不同的系统启动状态执行不同的启动控制策略。 [0044] wherein, in step A, the system first determines activated state (warm start or cold start), and then performs different control strategies depending on the start of the system start-up state. 应当理解,汽车空调系统的启动控制分为两种:冷启动工况和热启动工况,本方案针对不同的启动工况提供了相应的启动控制方法。 It should be appreciated that the control start automotive air conditioning system is divided into two: the cold start and hot start conditions conditions, the present embodiment provides a control method for starting a corresponding different starting conditions. 不失一般性, 下表中分别示明了判断冷启动和热启动的一种方式。 Without loss of generality, the following table show a way of determining apparent cold start and hot start.

Figure CN103033008BD00061

Figure CN103033008BD00071

[0046] 当然,冷启动与热启动还可以通过检测汽车空调系统的压力和/或温度等信号来进行判断。 [0046] Of course, the cold start and hot start can also be determined by detecting the like automotive air conditioning system pressure and / or temperature signals.

[0047] 请参见图2,该图示出了第一实施例所述启动控制阶段的流程框图。 [0047] Referring to Figure 2, which shows a block flow diagram of a first embodiment of the control phase starts.

[0048] 如图2所示,当汽车钥匙开启后,该控制方法在冷启动状态下执行下述步骤后进入运行控制阶段: After [0048] As shown, when the car key is turned on, the control method performing the steps of a cold start operating state into the control phase 2:

[0049] A1.调节电子膨胀阀至全闭; . [0049] A1 electronic expansion valve to the fully closed;

[0050] A2.调节电子膨胀阀开启至小开度。 [0050] A2. Electronic expansion valve opening degree to a small opening.

[0051] 应当理解,电子膨胀阀的开度指的是与电子膨胀阀全开时相比较所得的阀口通流面积的比例。 [0051] It will be appreciated, the opening degree of the electronic expansion valve means that the ratio of the flow area of ​​the valve opening phase when comparing the resultant with the electronic expansion valve is fully open. 这一比例还与该系统所匹配的电子膨胀阀的容量大小相关,如果所用的电子膨胀阀容量相对较大,则开度可以小一些;反之,开度要大一些。 This ratio is also related to the capacity of the system to match the size of the electronic expansion valve, if the electronic expansion valve used in a relatively large capacity, the opening degree can be smaller; on the contrary, the degree of opening to be larger.

[0052] 通常,可发出脉冲信号至电子膨胀阀的控制端,控制电子膨胀阀处于全闭或者小开度工作状态。 [0052] Generally, the pulse signal may be sent to the control terminal of the electronic expansion valve, controlling the electronic expansion valve in the fully closed state or a small opening. 具体控制设计时,可根据实际系统配置输出相应的脉冲,比如,以一种500脉冲的电子膨胀阀来说,若设置500Step的关闭、或开启脉冲实现阀全闭或全开控制,以找到初始基准点,则可设置lOOStep甚至于50Step的小开度脉冲调节电子膨胀阀在冷启动完成后处于小开度工作状态。 DETAILED control design, may output a corresponding pulse in accordance with the actual system configuration, for example, an electronic expansion valve 500 in a pulse, if the setting is off 500Step or open the valve fully closed or pulsed to achieve full control, to find the initial reference point may be set even 50Step lOOStep small opening pulse electronic expansion valve in a cold start is completed in the small opening state. 如此设置,有利于系统尽快建立高低压端压力差,有效控制低压压力小范围波动,使得压缩机的负载稳定及系统尽快稳定;同时,启动时对压缩机不会产生液击,控制过程更加稳定。 Thus provided, the system is conducive to high and low end of the pressure differential established quickly, effectively control small fluctuations in the low pressure, so that the load of the compressor system stability and stability as quickly as possible; the same time, the compressor will not start slugging, the control process is more stable .

[0053]需要说明的是,对于LIN或CAN信号的汽车系统而言,本方法可有效利用LIN信号或者CAN信号确定空调系统是否处于上述三种冷启动状态;比如,空调电源被关闭后一定时间长度(比如2分钟)后重新开启,即确定处于冷启动状态;再比如,可以结合LIN或CAN信号中的高压保护、排气温度过高保护及低压过低保护信息,确定空调系统处于由空调安全停机后的重新开机。 [0053] Incidentally, systems for automotive CAN or LIN signal, the present method can effectively utilize the signal LIN or CAN signals whether the air conditioning system is to determine the three cold start condition; for example, air conditioning is turned off after a certain time the length (for example 2 minutes) re-open, i.e. determined to be in a cold start condition; another example, may incorporate pressure protection signal LIN or cAN, the exhaust gas low temperature protection and low protection information, determined by the air conditioner air conditioning system is reboot after the safety shutdown. 当然,实际上根据不同车型配置也可以通过专用的信号采集装置获取参数信号进行逻辑判断。 Of course, in fact, different logical judgment model configuration parameters may acquire a signal through a dedicated signal acquisition device according to.

[0054] 另外,空调系统使用一段时间后,构成该系统的元器件难免会出现各类故障,对于电子膨胀阀而言,由于汽车空调系统的使用环境相对恶劣,工况变化大,有时环境温度会较高甚至达到70~80°C,此状态下的电子膨胀阀自身有可能会出现个别情况下的过热、过流或者卡死等现象。 [0054] In addition, the air conditioning system after a period of time, constitute the system components will inevitably be various types of failure for electronic expansion valve, since the automotive air conditioning system using relatively harsh environment, working condition changes, sometimes ambient temperature will be higher even up to 70 ~ 80 ° C, the electronic expansion valve itself in this state it is possible in individual cases overheating will occur, or the overcurrent stuck phenomenon. 为了确保空调系统启动后,能够在正常过热度控制过程中确保系统安全、 可靠地运行,本方法可在第一实施例的基础上增加自检步骤。 To ensure that the air conditioning system is started, the system security can be ensured in the normal superheat degree control process, reliable operation, the present method may increase the self-test step on the basis of the first embodiment.

[0055] 请参见图3,该图是另一实施例所述启动控制阶段的流程框图。 [0055] Referring to FIG 3, which is a block flow diagram of another embodiment of the control phase starts.

[0056] 如图3所示,本实施例与前一实施例的区别在于:在步骤A1前执行步骤Α0:Α0.调节电子膨胀阀至全开,并控制电子膨胀阀进行自检,以电子膨胀阀在第一时间长度内完成全开及全闭为条件,调节电子膨胀阀开启至小开度。 [0056] As shown in FIG. 3, the present embodiment is that a difference between the previous embodiment: a step performed before step A1 Α0:. Α0 electronic expansion valve to fully open, and control self-test electronic expansion valves, electronic completion of the expansion valve is fully opened and fully closed condition of the first length of time, an electronic expansion valve opening degree to a small opening. 也就是说,步骤A3(实施例一步骤A2)前, 若控制该电子膨胀阀能够在第一时间长度内有序完成全开、全闭两个动作,则可确定该电子膨胀阀处于无故障状态,可安全进行步骤A3调节电子膨胀阀开启至小开度;若否则发出报警信号或者进入停机保护状态。 That is, prior to step A3 (step Example A2 a), if the control of the electronic expansion valve can be fully opened in order to complete the length of the first time, two movements fully closed, the electronic expansion valve may be determined in a no-fault state, step A3 can secure electronic expansion valve opening to a small opening degree; if otherwise, a warning signal or a shutdown protection state enters. 需要说明的是,该第一时间长度为确定的预设时间,基于不同型号的电子膨胀阀略有不同,此处为避免与本方案中其他时间长度混淆,将自检过程的预设时间表述为"第一时间长度",显然,该表述并不构成对本申请保护范围的限制。 Incidentally, the length of the first time to determine a preset time, the electronic expansion valve is slightly different based on the model, where the length of time to avoid other obscure the present embodiment, the preset time the self-test expression for the "first time duration" obviously, this expression does not limit the scope of protection of the present application.

[0057] 在工作过程中,若该小开度设置太小,则自检后高低压端压力差会相对较高;而若该小开度太大,则系统高低压端建立压力的过程相对要长一些,系统进入平稳运行的过程相对要长一些即系统响应较慢。 [0057] In operation, if the opening degree setting too small, the high and low ends of the self-test after the pressure difference is relatively high; and if the opening is too small, the pressure build-up system is relatively high and low end of the process is longer, the process enters the smooth operation of the system is relatively slow system response that is longer. 优选地,小开度为电子膨胀阀全开度的2%_20%。 Preferably, a small opening was 2% _20% of the electronic expansion valve is fully open. 更加优选的,小开度为电子膨胀阀全开度的5%_15%。 More preferably, the small opening 5% _15% of the electronic expansion valve is fully open.

[0058] 同样,该自检步骤A0同样可以有效利用LIN总线或者CAN总线传输的参数信号。 [0058] Also, the self-test step parameter A0 can also be effectively utilized CAN bus or LIN bus signal transmission.

[0059] 如前所述,汽车空调系统还存在热启动工况。 [0059] As described above, there are automotive air conditioning system hot start conditions. 汽车处于运行状态下,且空调系统开关按钮处于关停状态,此时,若将该开关按钮切换至打开状态启动空调系统,则为热启动工况。 The car is running, and the air conditioning system is in the shutdown state of the switch button, this time, if the switch button is switched to the open state to start the air conditioning system, for the hot start condition.

[0060] 热启动状态下,该控制方法直接进入运行控制阶段,即直接进入正常过热度控制过程。 The [0060] heat activated state, the control method directly to the control stage operation, i.e., directly into the normal superheat degree control process. 同样,对于LIN或CAN信号的汽车系统而言,本方法可有效利用LIN信号或者CAN信号确定空调系统是否处于热启动状态;比如,空调电源被关闭后一定时间长度(比如2分钟)内重新开启工况。 Reopen example, air conditioning is turned off after a certain length of time (say 2 minutes); Similarly, systems for automotive CAN or LIN signal, the present method can effectively utilize the signal LIN or CAN signal to determine whether air conditioning system is thermally activated state conditions. 或者结合LIN或CAN信号与采集到蒸发器的蒸发温度或者压力进行逻辑判断, 确定空调系统处于因负荷调节引起的0N/0FF循环中的开机为热启动工况。 LIN or CAN signals or a combination of logic judgment and collected evaporation temperature or the pressure of the evaporator, the air conditioning system is determined 0N / 0FF cycle adjustment caused by a load in the boot hot start conditions. 应当理解,本领域技术人员基于现有技术完全可以实现上述启动状态的判断,故本文不再赘述。 It should be appreciated that those skilled in the art can achieve the above-described start-up state is determined based on the prior art, and therefore will not be repeated herein.

[0061] 其中,步骤B中,在运行控制阶段的压缩机启动初始阶段,控制电子膨胀阀达到与压缩机的转速相对应的恒定开度,以与压缩机的转速相对应的所述恒定开度进入正常运行阶段控制;具体请参见图4,该图示出了运行控制阶段的第一实施例的流程框图。 [0061] wherein, in Step B, the initial stage of start of operation control of the compressor stage, controlling the electronic expansion valve and the compressor speed to achieve a constant degree of opening corresponding to the rotational speed of the compressor constant corresponding opening entering the normal operation of the control stage; specifically see Figure 4, which shows a block flow diagram of a first embodiment of a control stage operation.

[0062] 如图4所示,在压缩机启动后,实时获取压缩机转速信号,并按照如下步骤进行: [0062] As shown, after the compressor starts, the compressor rotational speed signal 4 obtained in real time, and according to the following steps:

[0063] B1.在压缩机启动初始阶段,控制所述电子膨胀阀达到与压缩机的转速相对应的恒定开度。 [0063] B1. In the initial stage of starting the compressor, controlling the compressor and the electronic expansion valve is at a constant rotational speed corresponding to the degree of opening.

[0064] B2.压缩机启动初始阶段结束后,以与压缩机的转速相对应的所述恒定开度进入正常运行阶段控制,以便于所述电子膨胀阀的开度转入过热度控制方式。 [0064] B2. The compressor starts after an initial stage, the rotational speed of the compressor to the opening degree corresponding to the constant control stage into the normal operation, so that control proceeds to the superheat degree of the opening degree of the electronic expansion valve. 即,在压缩机启动初始阶段,该电子膨胀阀的开度仅根据压缩机的转速进行调整,而不受汽车空调系统过热度的影响;其中的压缩机转速信号的获取可以采用独立传感器进行采集或借用压缩自身的控制信号,而对于采用LIN或CAN协议的汽车系统来说,该压缩机转速信号也可以自LINS CAN信号传给电子膨胀阀控制程序。 That is, starting at the initial stage of the compressor, the opening degree of the electronic expansion valve is only adjusted according to the speed of the compressor, without being affected by the degree of superheat of the automotive air conditioning system; obtaining individual sensors may be employed wherein a compressor rotational speed signal acquisition or borrow compression control signal itself, whereas LIN or cAN protocol for use in automotive systems, the compressor rotational speed signal may be transmitted to an electronic signal from the cAN LINS expansion valve control routine.

[0065] 本文中,在一定的压缩机转速内电子膨胀阀的恒定开度为一相对应的恒定值;且该恒定开度与压缩机的转速呈正向对应关系,即该恒定开度随着压缩机转速的增加呈增大的趋势变化,两者之间的关系可参见图6中所示的一种实施方式。 [0065] Herein, in a certain compressor speed constant opening of the electronic expansion valve corresponding to a constant value; and the constant opening degree of the rotational speed of the compressor as a positive correspondence relationship, i.e., with the constant opening degree change increases the compressor speed was increasing trend, may be the relationship between one embodiment shown in FIG. 6 see.

[0066] 此外,压缩机启动初始阶段指的是压缩机启动后到低压侧压力相对稳定或程序设定的一个相对固定的时间段如30S-60S之间的任一时间段。 [0066] In addition, the initial stage compressor start refers to a time period between any of the 30S-60S to the low pressure side or programmed relatively stable after the start of the compressor relative to a fixed period of time. 实际上,有的汽车空调中的压缩机启动初始阶段相对长一些如60S,有的可能略短一些如30s;具体地,该启动初始阶段可以由系统程序根据该系统情况进行设置,当系统检测到低压侧的压力满足相对稳定的条件时或者启动后的时间达到系统设定的时间段时系统就判断启动初始阶段结束。 In fact, some automotive air-conditioning compressor startup initial stage relatively long, such as 60S, and some may be slightly shorter as 30s; Specifically, the initial startup phase can be set by the system based on the system program, the system detects when the when the low pressure side is relatively stable condition is satisfied or after the starting time when the system reaches a set period of time the system determines the end of the initial startup phase. 在压缩机启动初始阶段,恒定的开启度能保证电子膨胀阀的开度能够处于较为稳定的状态,使得初始阶段的膨胀阀处于稳定工作状态下,同时整个空调系统也处于相对稳定的工作状态下,从而可有效避免大的扰动给膨胀阀及系统带来的影响,并且这一恒定开度要小于正常运行阶段的电子膨胀阀的开度,这样有利于尽快建立高低压端的压力差,从而可以使系统更快地达到相对平衡。 In the initial stage of starting the compressor, to ensure a constant degree of opening of the electronic expansion valve opening degree can be in a more stable state, so that the initial stage of the expansion valve is in a steady operation state, while the air conditioning system is also relatively stable in the working state , which can effectively avoid the effects of large disturbance brought to the expansion valve, and the system, and this opening degree is less than a constant degree of opening of the electronic expansion valve normal operating phase, this will help to establish a pressure difference between the high and low end as soon as possible, thereby make the system more quickly achieve a relatively balanced. 在启动初始阶段结束后,电子膨胀阀的开度控制进入正常运行阶段进行控制。 After starting end of the initial phase, the opening degree of the electronic expansion valve control proceeds to the normal operation of phase control.

[0067] 汽车空调系统运行过程中,由于外部因素影响较大,其他外因极易导致汽车空调工况发生变化,及压缩机转速及电子膨胀阀的低压侧压力出现波动。 [0067] The automobile air conditioning system during operation, due to external factors is large, easily lead to other external automobile air conditioning condition is changed, and the low side pressure of the compressor and the electronic expansion valve speed fluctuations. 为克服相应参数波动对于系统工作稳定性的影响,本发明提供了第二种电子膨胀阀控制方法的实施例,具体请参见图5所示的汽车空调系统电子膨胀阀的控制方法的流程框图。 To address the effects parameters corresponding to the work fluctuation of the stability of the system, the present invention provides a second embodiment of the method of controlling an electronic expansion valve, the flow diagram shown in Figure method for controlling an electronic expansion valve of the automobile air conditioning system 5 shown in particular see.

[0068] 如图5所示,本实施例与第一实施例的区别在于,增加了有关参数恒定的判断步骤。 As shown in [0068] FIG 5, the present embodiment differs from the first embodiment in that a constant increase of the parameters determining step. 该方案按照如下步骤进行: The program according to the following steps:

[0069] B0.在启动时间段内判断所述压缩机的转速是否在一定时间区间内保持在一个转速区间内。 [0069] B0. In the starting period of the compressor determines whether the rotational speed remains within a speed range in a certain time interval. 需要解释说明的是,前述压缩机启动后到低压侧压力相对稳定或程序设定的一个时间段为启动初始阶段,而启动时间段是指启动初期相应的一个固定时间段,主要是指压缩机刚启动时即启动初始阶段的前期阶段,包括压缩机刚启动时转速较大波动的时间段及启动后转速转入规律变化的另一时间段。 Need explanation that, to the low pressure side or programmed relatively stable after a period of time the compressor is started to start initial stage, the starting time period is a fixed period of time means a respective start early, mainly refers to a compressor i.e., start of the early stage of the initial stage just started, further comprising a time when the compressor rotational speed fluctuates considerably time period has just started and the rotational speed variation laws transferred after startup.

[0070] 而本方案相比于第一实施例,所增设的步骤B0可避免压缩机转速在启动初始阶段的固定时间段内因波动导致控制切入点不准确的问题出现也就是说,只有当压缩机转速维持在每个转速区间一定时间区间后才给予电子膨胀阀相应的开度。 [0070] while the present embodiment compared to the first embodiment, additional steps can be avoided in the compressor speed B0 fixed time period starting at the initial stage of the entry point due to fluctuations caused by inaccurate control problems is to say, only when the compression to give the corresponding rotational speed to maintain the opening degree of the electronic expansion valve in each speed range after a certain time interval. 比如,该时间区间可以设定为Is或者0.5s等等。 For example, the time interval can be set to 0.5s Is or the like.

[0071]若步骤B0的判断结果为是,则执行步骤B1:控制所述电子膨胀阀达到与相应转速区间相对应的恒定开度。 [0071] If the determination result is YES in step B0, step B1: controlling the electronic expansion valve opening degree corresponding to a constant speed corresponding to the section. 由于压缩机的转速受系统的控制,在某些因素的影响可能随时在变化。 As the compressor speed by the control system, the influence of certain factors that could change at any time. 而本方案相比于第一实施例,所增设的步骤B1可避免压缩机转速在启动初始阶段因波动导致控制切入点不准确的问题出现,可有效避免膨胀阀过快的动作所造成的控制过于频繁等缺陷,为后续正常控制阶段提供了良好的基础;也就是说,只有当压缩机转速维持在每个转速区间一定时间长度后才调整电子膨胀阀相应的开度。 And the step of the present embodiment compared to the first embodiment, the additional speed of the compressor can be avoided B1 in the initial stage of startup due to fluctuations caused by inaccurate control entry point problem can be effectively controlled to avoid excessive operation of the expansion valve caused by too frequent defects, provide a good basis for the subsequent normal control phase; that is, only when the compressor speed to maintain a corresponding adjustment of the electronic expansion valve opening degree only after a certain length of time of each speed range. 比如,该第一时间长度可以设定为15s或者10s等等。 For example, the length of the first time can be set to 15s or 10s and the like.

[0072] B2.以所述汽车空调系统的低压侧压力满足恒定维持第二时间长度为条件,执行步骤B3; . [0072] B2 in the low pressure side of the automotive air conditioning system to maintain a constant length of the second time satisfies the condition, step B3;

[0073] B3.汽车空调系统进入正常运行阶段控制,电子膨胀阀的开度转入过热度控制方式。 [0073] B3. Automobile air conditioning system enters the normal operation phase of control, the opening degree of the electronic expansion valve proceeds to superheat control. 同样,在其他因素影响而导致电子膨胀阀的低压侧压力不稳定的状况,本方案中增设的步骤B2可避免非正常波动对于正常过热度控制阶段工作稳定性的影响。 Similarly, the other factors which led to the low-pressure side pressure of the electronic expansion valve of unstable state in step B2 in the present embodiment can avoid the influence of the addition of the non-normal operational stability for normal fluctuations superheat control stage. 也就是说,当低压压力连续一段时间保持为一定压力值时,视初始阶段结束,进入正常运行阶段。 That is, when the continuous period of time to maintain the low pressure constant pressure value, depending on the end of the initial stage into the normal operation phase. 比如,该第二时间长度可以调定为l〇s。 For example, the length of the second time may be adjusted as l〇s. 当然根据系统情况,第二时间长度也可以进行调整。 Of course, according to the system, a second length of time may be adjusted.

[0074]若步骤B0的判断结果为否,则执行步骤B5,控制所述电子膨胀阀达到启动时间段结束时刻的所述压缩机转速所在转速区间相对应的恒定开度,或者控制所述电子膨胀阀达到预设的初始启动开度。 [0074] If the determination result is NO in step B0, execute step B5, the electronic expansion control valve reaches the starting end of the period of time where the rotational speed of the compressor speed range corresponding to the constant opening degree, the electronic control or the expansion reaches a preset valve opening degree of the initial startup. 如此设置,启动时间段内若压缩机转速波动异常时,可以由程序控制电子膨胀阀达到与该压缩机转速对应的初始恒定开度(图中未示出),以保证系统启动运行。 Arranged such, if the period of the compressor to start the abnormal speed fluctuations can be achieved by a program-controlled electronic expansion valve opening degree and the constant corresponding to the initial rotational speed of the compressor (not shown), to ensure that the system is up and running. 显然,该初始恒定开度仅需要满足系统启动运行的需要即可。 Obviously, the initial opening of the constant need only meet the needs of the system to start running.

[0075]另外,针对变排量压缩机或可变转速压缩机,控制所述电子膨胀阀达到与压缩机的转速相对应的恒定开度,且汽车空调系统尚未进入正常运行控制阶段之前,即,在压缩机启动初始阶段的启动时间段后,压缩机转速可能自第一转速区间变化至第二转速区间。 Before [0075] Further, for the variable displacement compressor or a variable speed compressor, controlling the compressor and the electronic expansion valve is at a constant rotational speed corresponding to the degree of opening, and the automotive air conditioning system has not yet entered the control phase of the normal operation, i.e., , after the initial startup period starts the compressor stages, compressor speed may be changed to the second speed range section from the first speed. 若在第二转速区间内维持第二时间长度,则控制所述电子膨胀阀自与所述第一转速区间所对应的恒定开度达到与所述第二转速区间所对应的恒定开度,并保持调整后的恒定开度进入正常运行控制阶段。 If the length of the second time is maintained in the second speed range, the electronic control expansion valve from said first constant speed range corresponding to a constant degree of opening and the opening degree corresponding to the second speed range, and maintaining a constant degree of opening of the control phase adjustment into the normal operation. 需要说明的是,本文中"第一转速区间"及"第二转速区间"描述仅用于区别该工况下压缩机转速的变化,应当理解"第一" "第二"的使用并不限制本申请的保护范围。 Incidentally, herein, "a first speed range" and the "second speed range" describes the change in the compressor speed condition only for distinction, it will be understood that "first" and "second" does not limit the the scope of the present application. 同时,本方案中所述"恒定开度"为调控过程中相对确定的概念,在实际控制过程中根据压缩机转速变化的状况,该"恒定开度"存在调整的可能。 Meanwhile, the concept of the present embodiment to determine the relative regulation process, the rotational speed of the compressor in accordance with changing conditions, the "constant opening degree" in practice there may be adjustment of the control process "constant opening degree."

[0076] 优选地,还包括步骤B4: [0076] Preferably, further comprising the step B4:

[0077] B4.判断是否进入停机和保护环节,若否,则执行步骤B3;若是,则停机和保护。 [0077] B4 and determines whether to enter shutdown protection link, if not, perform Step B3;. If so, the protection and shutdown. 该停机保护信号可来自于系统控制模块发出信号,比如,对于采用LIN或CAN协议的汽车系统来说,该停机保护信号自LIN或CAN信号传给电子膨胀阀控制程序。 The protective shutdown signal from the system control module may send a signal, for example, LIN or CAN protocol for use in automotive systems, the shutdown protection signal LIN or CAN signals transmitted from an electronic expansion valve control routine.

[0078] 前述两个运行控制阶段的实施例中,在初始阶段(步骤B1),可以将所述压缩机的转速划分多个区间,并根据每个区间的压缩机转速确定相应的所述电子膨胀阀的恒定开度。 [0078] The operation of the two preceding embodiments the control stage, at the initial stage (step Bl), the rotational speed of the compressor may be divided into a plurality of sections, and determine the appropriate speed of the compressor according to each of the electronic section constant opening degree of the expansion valve. 如图6所示,以额定转速为5000RPM的压缩机为例,可将其转速范围划分为四个转速区间:当压缩机转速处于大于0RPM小于等于1000RPM区间时,控制电子膨胀阀处于全开度的10% ;当压缩机转速处于大于1000RPM小于等于3000RPM区间时,控制电子膨胀阀处于全开度的15%;当压缩机转速处于大于3000RPM小于等于5000RPM区间时,控制电子膨胀阀处于全开度的20%;当压缩机转速处于大于5000RPM时,控制电子膨胀阀处于全开度的25%。 6, at the rated speed of the compressor 5000RPM for example, can be divided into four speed range speed interval: When the compressor rotation speed is greater than or less 1000RPM 0RPM interval, control the electronic expansion valve is fully opened degree of 10%; when the compressor speed is greater than or less 1000RPM 3000RPM interval, controlling the electronic expansion valve is 15% of full throttle; when the compressor speed is greater than or less 3000RPM 5000RPM interval, control the electronic expansion valve is fully opened degree of 20%; when the compressor speed is greater than 5000RPM, controlling the electronic expansion valve is 25% full throttle.

[0079] 实际上,压缩机转速区间的划分并非局限于图6中所示,它可以根据压缩机选配及系统设计要求来确定,也可以通过如下方法来确定:通过其他手段控制膨胀阀的开度,使得不同工况、不同转速下的系统处于合适的过热度下,拟合转速和开度的关系,得到不同压缩机转速下电子膨胀阀开度的的预设定值;当然,上述实施方式中区间的划分、电子膨胀阀的开度范围并不是对本发明的限制,而只是提供一种思路,实际上,上述区间还可以是非等分的多个区间,另外电子膨胀阀开度也取决于该系统与电子膨胀阀容量的关系,如果所用的电子膨胀阀容量相对系统容量较大,则开度可以小一些;反之,开度要大一些。 [0079] In fact, the compressor speed range is divided is not limited as shown in FIG. 6, it can be determined according to system design requirements and the matching of the compressor, it may be determined by the following method: expansion valve is controlled by other means the degree of opening, so that the different operating conditions, the system at different speeds in the proper degree of superheat, the opening degree of the fitting relationship between the rotational speed and to obtain a pre-set value of the valve opening degree of the electronic expansion at different compressor speed; of course, the above-described dividing section embodiment, the range of the opening degree of the electronic expansion valve is not a limitation of the present invention, but only provide an idea, in fact, a plurality of the above section may also be non-bisected sections, additional electronic expansion valve opening degree is also the system depends on the relationship with the capacity of the electronic expansion valves, electronic expansion valve capacity if used in a relatively large system capacity, the opening degree can be smaller; on the contrary, the degree of opening to be larger. 需要说明的是,只要满足使用需要均在本申请请求保护的范围内。 Incidentally, as long as a request meet the needs are within the scope of the present application.

[0080] 此外,前两个运行控制阶段实施例(第一实施例的步骤B2,第二实施例的步骤B3) 中的电子膨胀阀进入正常运行阶段控制,可以依据下述步骤进行,请一并参见图7和图8,其中,图7示出了正常运行阶段的过热度控制逻辑关系,图8为正常运行阶段的过热度控制流程图。 [0080] In addition, the first two stages of the operation control embodiment (the first embodiment of the step B2, the second embodiment of the step B3) is an electronic expansion valve enters the normal operation phase control can be carried out according to the following procedure, a and Figures 7 and 8, wherein FIG. 7 shows a relationship between superheat degree control logic normal operation phase, the degree of superheat FIG. 8 is a control flowchart of the normal operating phase.

[0081] B31.根据所述压缩机的转速(RPM)确定所述电子膨胀阀的开度预调节量so;具体地,可以将所述压缩机的转速划分多个运行区间,并根据每个运行区间的压缩机转速确定相应的所述电子膨胀阀的开度预调节量so。 . [0081] B31 (RPM) rotational speed of the compressor is determined according to the degree of opening of the electronic expansion valve regulating the amount of pre-SO; Specifically, the rotational speed of the compressor may be divided into a plurality of operation period, and according to each compressor speed operation region corresponding to the determined opening degree of the electronic expansion valve preconditioning amount so. 本步骤中压缩机转速运行区间划分及其与电子膨胀阀的开度预调节量so之间的对应关系,也可以压缩机选配及系统设计要求来确定,具体可以参考图6的类型,故此处不再赘述。 In this step, division section and the electronic expansion valve opening degree of the compressor rotational speed preconditioned correspondence relationship between the amount so, optional compressor may be determined and the system design, the type specific reference to FIG. 6, therefore at not repeat them. 另外,本实施例中的压缩机转速运行区间区别于前面第一、二两个实施例中压缩机转速区间,两者可以有不同的划分方式;另外也可以相同划分。 Further, the compressor rotational speed operating range in the present embodiment is different from the foregoing first embodiment, twenty-two cases the compressor speed range embodiments, both may have different division manner; the same may be further divided.

[0082] B32.根据蒸发器出口或者压缩机进口的制冷剂温度和压力计算实际过热度Tsh; . [0082] B32 The outlet of the evaporator or the compressor inlet refrigerant temperature and pressure to calculate the actual degree of superheat Tsh;

[0083] B33.将所述实际过热度Tsh与预设的过热度阈值Tsh_set进行比较,并根据实际过热度Tsh获得开度调节增量Δ s; . [0083] B33 to the actual degree of superheat Tsh of superheat and a preset threshold Tsh_set compared, and the degree of opening adjustment increment is obtained Tsh Δ s in accordance with the actual degree of superheat;

[0084] B34.将所述开度预调节量So与所述开度调节增量As累加后输出调节开度的控制信号s至所述电子膨胀阀的控制端。 [0084] B34. The degree of opening of the pre-regulator output adjustment So adjusting the opening degree increments As accumulation control signal s to the opening degree of the electronic expansion valve control terminal.

[0085]本方案所述控制方法中,可以如图8所示依次执行步骤831、832333;也可以先执行步骤B32、B33,然后再执行步骤B31。 [0085] The control method of the present embodiment may be sequentially performed step 8 831,832333; may be performed before step B32, B33, and then executes step B31.

[0086]显然,本方法实际上是将压缩机的转速信号作为开度的预调节的一种输入信号, 使得开度预先达到某一状况,从而可减少过热度调节阶段的调节幅度的波动。 [0086] Obviously, the present method is actually a compressor rotational speed signal as the opening degree of preconditioning an input signal, such that the opening degree reaches a certain predetermined conditions, thereby reducing the degree of superheat of accommodative amplitude fluctuation adjustment phase. 具体来说,需要说明的是,对于LIN或CAN信号的汽车系统而言,本方法所涉及的实时参数,可有效利用LIN信号或者CAN信号获取,也可以单独进行采集。 Specifically, it should be noted that, for automotive CAN or LIN signal system, real-time parameters of the process involved, may be effectively utilized CAN or LIN signal signal acquisition, the acquisition may be performed separately. 比如,蒸发器出口或压缩机进口的温度通过热电阻测得,压力信号由压力传感器测得,这两个信号通过转换电路转换成电压或者电流信号后输入控制板。 For example, the compressor inlet or outlet of the evaporator temperature measured by the thermal resistance, the pressure measured by the pressure sensor signal to give, after conversion to the control board input voltage or current signal through the switching circuit the two signals. 然后,将温度和压力计算出实际过热度与设定过热度作对比,通过比例(P)、比例积分(PI)或者比例积分微分(PID)等控制算法来实现过热度的计算及控制,直至系统实际过热度符合设定的过热度要求。 Then, the temperature and pressure to calculate the actual degree of superheat for comparison with the predetermined degree of superheating, and to achieve control of the degree of superheat is calculated by the ratio of (P), proportional-integral (PI) or proportional integral derivative (PID) control algorithm, etc., until the the actual degree of superheat system meets the requirements set superheat. 应当理解,本领域技术人员基于现有技术完全可以实现上述参数的获得,故本文不再赘述。 It should be understood that those skilled in the art based on the prior art to obtain the above parameters can be fully implemented, it will not be repeated herein.

[0087]优选地,执行步骤B31之前执行步骤B30: [0087] Preferably, prior to performing step B31 to step B30:

[0088] B30.以所述压缩机的转速满足在相应转速区间内维持第三时间长度为条件,执行步骤B31。 [0088] B30. Rotational speed of the compressor to maintain the length of the third time satisfies the conditions in the respective speed range, step B31. 同样,本方案增设的步骤B30也可避免压缩机转速非正常波动影响实时控制精度。 Also, the additional program steps can be avoided B30 compressor speed control non-normal fluctuations in real time accuracy. 也就是说,只有当压缩机转速进入该区间一定时间后才作出相应的调整,而不是时时刻刻在调整,以保证系统的稳定性。 That is, only when the rotational speed of the compressor after a predetermined time interval to enter the appropriate adjustments, rather than always adjusted in order to ensure stability of the system.

[0089] 另外作为优先实施方式,在前面运行控制阶段第一、第二实施例的步骤B1:电子膨胀阀的开度根据压缩机的转速保持恒定开度,还可以作进一步改进,即:控制电子膨胀阀依次进行全开、全闭两个动作,并以所述电子膨胀阀在预定时间长度内完成全开及全闭为条件,再控制电子膨胀阀达到与压缩机的转速相对应的恒定开度。 [0089] Further embodiment as a preferred embodiment, the front stage of the first control operation, the second step of Example B1: opening of the electronic expansion valve opening degree is kept constant according to the rotational speed of the compressor, may be further improved, namely: control sequentially electronic expansion valve fully open, fully closed two actions, and to complete the electronic expansion valve is fully opened and fully closed condition within a predetermined length of time, and then controls the electronic expansion valve of the compressor reaches a constant speed corresponding to the the degree of opening. 这样,一方面可以对电子膨胀阀进行自检,确保系统安全、可靠地运行;另一方面可保证电子膨胀阀的开度的一致性、 准确性。 In this way, one can perform self-test of the electronic expansion valve, to ensure safe, reliable operation; on the other hand ensures that the opening degree of the electronic expansion valve consistency, accuracy.

[0090] 进一步地,前述两个实施例中所述过热度阈值区间可以基本过热度阈值曲线为基准,如图9所示,该图为一种所述过热度阈值区间与基本过热度阈值的关系曲线示意图,图中实线表示基本过热度阈值曲线,虚线表示过热度阈值区间的边界。 [0090] Further, in the two preceding embodiments of superheat threshold interval may be substantially superheat threshold reference curve, shown in Figure 9, one of the picture shows the degree of superheat threshold value interval and the threshold value substantially superheat schematic curve, the solid line shows a basic superheat threshold curve, a broken line indicates the boundary superheat threshold interval.

[0091] 如图9所示,该实施方式中,正常过热度设定范围(正常负荷区)内的所述过热度阈值区间设定为±l°c;过热度(SHset)为0°C时的所述过热度阈值区间设定为0°C;过热度(SHset)大于20°C时的所述过热度阈值区间设定为0°C,整体形成一个封闭区间。 [0091] As shown in FIG. 9, in this embodiment, the normal superheat setting range (normal load area) superheat threshold range is set to ± l ° c; superheat (SHset) of 0 ° C the degree of superheat when the threshold value interval is set to 0 ° C; the superheat threshold period when the degree of superheat (SHset) greater than 20 ° C is set to 0 ° C, a closed section integrally formed. 需要说明的是,为清楚示出过热度区域区间基于基本过热度阈值曲线形成的关系,图中过热度(SHset)大于20°C的虚线与实线之间存在微小间隙,显然,未完全封闭的图示状态并不影响该过热度阈值区间为一封闭区间的理解。 Note that, for clarity illustrating the degree of superheat zone interval based on a relationship substantially superheat threshold curve which, in FIG superheat (SHset) is larger than there is a slight gap between the broken line and the solid line at 20 ° C, obviously, is not completely closed the illustrated state does not affect the degree of superheat is understood that a threshold value interval closed interval. 另外,正常过热度设定范围内的过热度阈值区间也可以根据系统配置作相应的调整,即由正常过热度设定范围内的基本过热度阈值曲线上下浮动一温度定值形成,而非局限于± 1°C;比如,若汽车空调系统温度控制精度要求较高, 其正常过热度设定范围内的过热度阈值区间可设置为±0.5°C;再比如,若汽车空调系统温度控制要求相对较低,其正常过热度设定范围内的过热度阈值区间可设置为±2°C等等。 Further, the degree of superheat threshold value interval within the normal superheat setting range may also be adjusted according to system configuration, i.e., the degree of superheat from the basic floating threshold curve within the normal range of the upper and lower superheat setting a temperature value is formed, and not limitation at ± 1 ° C; for instance, if the automotive air conditioning system requires high precision temperature control, superheat threshold range within which the normal superheat setting range may be set to ± 0.5 ° C; another example, if the automotive air conditioning system temperature control requirements relatively low superheat threshold range within which the normal superheat setting range may be set to ± 2 ° C and the like. 显然,该温度定值的大小并不构成对本申请保护范围的限制,只要应用本方法的核心设计构思均在本申请请求保护的范围内。 Clearly, the magnitude of the setpoint temperature do not limit the scope of protection of the present application, as long as the application of the method the core design concepts are within the scope of the request in the present application.

[0092] 此外,低负荷区和高负荷区的过热度阈值区间均小于等于正常负荷区的过热度阈值区间,这样,在过热度由正常负荷区经低负荷区至过热度(SHset)为0°C点的区间内,以及过热度由正常负荷区经高负荷区至过热度(SHset)大于20°C的区间内,电子膨胀阀开度调整限制相应变小,以避免电子膨胀阀在接近极限点处的开度调整精度。 [0092] In addition, the degree of superheat threshold value interval low load region and the high load region are less than or equal superheat threshold interval normal load area, so that the superheat degree from the normal load area after the low load region to the degree of superheat (SHset) 0 interval ° C point, and the degree of superheat of the normal load area after a high-load region to a degree of superheat (SHset) is greater than the interval of 20 ° C, the electronic expansion valve adjustment limits corresponding smaller, in order to avoid the electronic expansion valve close the degree of opening at the limit point adjustment precision. 具体地,如图9所示, 蒸发温度(Tevap)小于_1°C(低负荷区)时,所述过热度阈值区间呈线性变化;且蒸发温度(Tevap)为_1°C的位置处(低负荷区与正常负荷区交汇处),所述过热度阈值区间呈圆弧状渐变过渡。 Specifically, as shown, the evaporation temperature (Tevap) less than _1 ° C (low load region) 9, the threshold value interval superheat linear variation; and the evaporation temperature (Tevap) at positions _1 ° C of (low-load area and the normal load area interchange), the superheat threshold arcuate gradual transition section. 蒸发温度(Tevap)大于15°C(高负荷区)时,所述过热度阈值区间呈线性变化;且蒸发温度(Tevap)为15°C的位置处(正常负荷区与高负荷区交汇处),所述过热度阈值区间呈圆弧状渐变过渡。 The evaporation temperature (Tevap) greater than 15 ° C (high load region), the threshold value interval superheat linear variation; and the evaporation temperature (Tevap) at positions 15 ° C (the normal load and the high load region junction region) the superheat threshold arcuate gradual transition section. 显然,优化方案中的低负荷区、正常负荷区及高负荷区三个区段均整体呈渐变的趋势变化,使得控制过程较为平稳可靠;同时,相邻两个区段交汇处均呈圆弧状渐变过渡,即低负荷区和高负荷区的边界变化曲线均大致呈半抛物线状,进一步提高控制过程的平稳可靠性。 Obviously, changes in the optimization low-load area, the normal load area and a high load region are three segments of the overall trend was gradual, so that the control process is more stable and reliable; simultaneously, two adjacent arcuate segments showed Interchange shaped gradual transition, i.e., the boundary curve a low load region and the high load region are substantially semi-parabolic shape, to further improve the reliability of the stationary control process. 同样需要说明的是,图9中所示低负荷区、正常负荷区及高负荷区的划分仅为一示例性描述,以清楚说明本发明的核心设计,上述三个负荷区的划分也可以根据系统的具体情况进行界定,在此不再赘述。 Note that the same, FIG. 9 is divided low load region, high load area and the normal load area only an exemplary description to make it clear the core design of the present invention, the three load zone may be divided according to define the specific circumstances of the system, not described herein again.

[0093] 其中,步骤C中,首先判断系统停机状态(热停机或者冷停机),再根据不同的系统停机状态执行不同的停机控制策略。 [0093] wherein, in step C, the first stop state is determined the system (hot or cold shutdown down), stop and then performs different control strategies depending on the status of the system shutdown. 应当理解,汽车空调系统的停机控制分为两种:热停机工况和冷停机工况,本方案针对不同的停机工况提供了相应的停机控制方法。 It should be understood that the stop control automotive air conditioning system is divided into two types: thermal shutdown conditions and cooling down conditions, the program provides a stop control method corresponding to different shutdown conditions. 不失一般性, 下表中分别示明了热停机和冷停机的判断方式。 Without loss of generality, the following tables show apparent thermal shutdown mode is determined and the cold shutdown.

Figure CN103033008BD00121

[0095] 请参见图10,该图示出了第一实施例所述停机控制阶段的流程框图。 [0095] Referring to FIG 10, which shows a block flow diagram of a first embodiment of the phase control stop.

[0096] 如图10所示,在热停机状态下,该控制方法执行下述步骤: [0096] As shown, in the hot shutdown state, the control method performs the following 10 steps:

[0097] C1.调节电子膨胀阀至全闭。 [0097] C1. Electronic expansion valve to the fully closed.

[0098] 通常,可发出脉冲信号至电子膨胀阀的控制端,控制电子膨胀阀处于全闭工作状态。 [0098] Generally, the pulse signal may be sent to the control terminal of the electronic expansion valves, electronic expansion control valve is fully closed operating state. 具体控制设计时,可根据实际系统配置输出相应的脉冲,当然,控制电子膨胀阀全闭的脉冲信号可以根据具体阀的参数来确定,比如,以一种500脉冲的电子膨胀阀来说,可设置500STEP的关闭脉冲实现阀全闭控制。 DETAILED control design, may output a corresponding pulse in accordance with the actual system configuration, of course, a pulse signal controlling the electronic expansion valve is fully closed may be determined according to the specific parameters of the valve, for example, an electronic expansion valve 500 in a pulse, it can be provided 500STEP closing valve full closing control impulse achieved.

[0099] 需要说明的是,对于LIN或CAN信号的汽车系统而言,本方法可有效利用LIN信号或者CAN信号确定空调系统是否处于前述两种热停机状态。 [0099] Incidentally, systems for automotive CAN or LIN signal, the present method can determine the air conditioning system is in a stopped state using the two aforementioned thermal signal LIN or CAN signal. 比如,空调电源被关闭后一定时间长度(比如2分钟)内重新开启的停机工况;或者结合LIN或CAN信号与采集到蒸发器的蒸发温度或者压力进行逻辑判断,确定空调系统处于因负荷调节引起的0N/0FF循环中的停机环节为热停机工况。 For example, air conditioning is turned off a predetermined length of time after (say 2 minutes) to reopen the shut down condition; or a combination of LIN or CAN signal logic determines the acquisition to the evaporation temperature or the pressure of the evaporator is determined air conditioning system is a result of load adjustment stop part 0N / 0FF circulation caused by heat in the shutdown conditions.

[0100] 如前所述,汽车空调系统还存在冷停机工况。 [0100] As described above, there are air conditioning systems cold shutdown conditions. 冷停机状态下,执行下述步骤: Cold stop state, perform the following steps:

[0101] C2.调节电子膨胀阀开启至小开度。 [0101] C2. Electronic expansion valve opening degree to a small opening. 即,冷停机时可以将高低压泄放,并维持该开度。 I.e., cold shutdown may be high and low bleed, and maintaining the opening degree. 应当理解,电子膨胀阀的开度指的是与电子膨胀阀全开时相比较所得的阀口通流面积的比例。 It will be appreciated, the opening degree of the electronic expansion valve means that the ratio of the flow area of ​​the valve opening phase when comparing the resultant with the electronic expansion valve is fully open. 这一比例还与该系统所匹配的电子膨胀阀的容量大小相关,如果所用的电子膨胀阀容量相对较大,则开度可以小一些;反之,开度要大一些。 This ratio is also related to the capacity of the system to match the size of the electronic expansion valve, if the electronic expansion valve used in a relatively large capacity, the opening degree can be smaller; on the contrary, the degree of opening to be larger. 以一种500脉冲的电子膨胀阀来说,若设置500Step的关闭、或开启脉冲实现阀全闭或全开控制,以找到初始基准点,则可设置lOOStep甚至于50Step的小开度脉冲调节电子膨胀阀在冷启动完成后处于小开度工作状ίέτ 〇 An electronic expansion valve 500 in a pulse, if the setting is off 500Step or open the valve fully closed or pulsed to achieve full control, to find the initial reference point may be set even lOOStep 50Step of electronic pulse conditioning small opening after a cold start of the expansion valve at the completion of the small opening like square ίέτ

[0102] 同样,对于LIN或CAN信号的汽车系统而言,本方法可有效利用LIN信号或者CAN信号确定空调系统是否处于前述三种冷停机状态;比如,空调电源被关闭后一定时间长度(比如2分钟)后重新开启的停机,即确定处于冷停机状态;再比如,可以结合LIN或CAN信号中的高压保护、排气温度过高保护及低压过低保护信息,确定空调系统处于由空调安全保护停机为冷停机状态。 [0102] Similarly, the system for automotive CAN or LIN signal, the present method can effectively utilize the signal LIN or CAN signals to determine whether the air conditioning system is in a cold shutdown state of the aforementioned three; for example, air conditioning is turned off after a certain length of time (for example, 2 minutes) to re-open after the stop, i.e. to determine in a cold shutdown state; another example, may incorporate pressure protection signal LIN or cAN, the exhaust gas low temperature protection and low protection information, determined by the air conditioner air conditioning system is safe protection shutdown cold shutdown state. 当然,实际上根据不同车型配置也可以通过专用的信号采集装置获取参数信号进行逻辑判断。 Of course, in fact, different logical judgment model configuration parameters may acquire a signal through a dedicated signal acquisition device according to. 应当理解,本领域技术人员基于现有技术完全可以实现上述停机状态的判断,故本文不再赘述。 It should be appreciated that those skilled in the art can achieve the above-described stop state is determined based on the prior art, and therefore will not be repeated herein.

[0103] 另外,空调系统使用一段时间后,构成该系统的元器件难免会出现各类故障,对于电子膨胀阀而言,其自身同样可能由于过热、过流或者卡死等现象。 [0103] In addition, the air conditioning system after a period of time, constitute the system components will inevitably be various types of failure for electronic expansion valve, its own equally likely due to overheating, over-current or stuck and so on. 为了确保空调系统停机后,能够在正常过热度控制过程中确保系统能够再次安全、可靠地运行,本方法可在第一实施例的基础上增加控制电子膨胀阀自检的功能。 To ensure that the air conditioning system is shut down, the process can be controlled to ensure that the system can again safe, reliable operation, the method may control an electronic expansion valve to increase the self-test functions on the basis of the first embodiment in the normal superheat.

[0104] 请参见图11,该图是第二实施例所述停机控制阶段的流程框图。 [0104] Referring to FIG. 11, which is a block flow diagram of a second embodiment of the phase control stop.

[0105] 如图11所示,本实施例与第一实施例的区别在于:冷停机状态下,调节电子膨胀阀开启至小开度后执行以下步骤: Difference [0105] 11, the first embodiment of the present embodiment is characterized in: a cold shutdown state, adjustment of the electronic expansion valve opening degree to a small opening after the following steps:

[0106] C3.控制电子膨胀阀进行自检。 [0106] C3. Self-test electronic expansion valve control. 所述电子膨胀阀自检具体为:基于LIN信号,调节电子膨胀阀开启至全开度后全闭;并以所述电子膨胀阀在第四时间长度内完成全开及全闭为条件,调节所述电子膨胀阀开启至小开度;即,完成电子膨胀阀的自检后,调节电子膨胀阀至小开度动作。 The self-test electronic expansion valve in particular: LIN signal based, electronic expansion valve is fully open to the fully closed opening degree; and at the completion of electronic expansion valve is fully opened and fully closed conditions within the length of the fourth time, adjusting the electronic expansion valve opening to a small opening degree; That is, after completion of self-test electronic expansion valves, electronic expansion valve to a small degree of opening operation. 也就是说,若控制该电子膨胀阀能够在确定的时间长度内有序完成全开、全闭两个动作,则可确定该电子膨胀阀处于无故障状态,可安全进行后续控制程序的启动,为下次启动响应提供了可靠保障;若否则发出报警信号或者进入停机保护状态。 That is, when the control of the electronic expansion valve can be fully opened in order to complete the length of time determined by two fully-closed operation, it may be determined that the electronic expansion valve is in the fault-free state, can be started subsequent security control program, for the next response provides a reliable protection starts; otherwise, if an alarm signal or enter shutdown protection status. 进一步来说, 本方法将电子膨胀阀的自检设置于停机控制阶段,以便于下次启动直接进入启动控制程序,相比于在启动控制阶段设置自检控制的方案而言,本方案可节省启动时间,具有较好的系统响应能力。 Further, the present method is an electronic expansion valve disposed in self-test stop control phase, the control program for entering the boot at the next start, the self-test is provided as compared to the control phase of the program in the start control, it can be saved. start time, with a better system responsiveness.

[0107] 工作过程中,若该小开度太小,则自检后高低压端压力平衡过慢;而若该小开度太大,则自检后阀至全闭行程过长,系统响应较慢。 [0107] operation, if the small opening is too small, the high and low ends of the self-test after the pressure equalization too slow; and if the opening is too small, the self-test trip to the fully closed valve is too long, the system response slower. 优选地,该小开度为电子膨胀阀全开度的10%-40%。 Preferably, the small opening degree of 10% -40% of an electronic expansion valve is fully open. 同样,该自检步骤同样可以有效利用LIN总线或者CAN总线传输的参数信号。 Also, the self-test step parameter signals may also be effectively utilized CAN bus or LIN bus transfer.

[0108] 基于在停机控制阶段控制电子膨胀阀进行自检的构思,本方法在冷停机状态下, 可以如图11所示依次执行步骤C2、C3,也可以先执行步骤C3后再执行步骤C2,当然,该执行顺序应当略去步骤C3中调节所述电子膨胀阀开启至小开度这一动作。 [0108] In the electronic expansion valve control based on the stop control concept stage self-test, the method in the cold shutdown state, as shown in FIG 11 sequentially performs steps C2, C3, a step may be performed after the first step C2 C3 , and of course, the order of execution of said adjusting step C3 should be omitted electronic expansion valve is opened to a small opening degree of the operation. 当然,也可以略去步骤C2而仅执行步骤C3。 Of course, also be omitted and only step C2 to step C3. 同样可以满足冷停机后调节电子膨胀阀开度至小开度,并在停机控制阶段完成电子膨胀阀的自检的功能需要。 After cooling down to meet the same electronic expansion valve opening degree to a small opening degree, and completion needs to be checked in the electronic expansion valve shutdown control stage.

[0109]请参见图12,该图示出了第三实施例所述停机控制阶段的流程图。 [0109] Referring to FIG. 12, which illustrates a flowchart of a third embodiment of the phase control stop.

[0110] 如图所示,该控制方法按照下述步骤进行: [0110] As shown, the control method performed by the following steps:

[0111] C1.根据停机信号控制结束运行控制阶段,并根据停机信号获得停机状态的判断结果。 [0111] C1. The end stop control signal to control phase of operation, and obtains the off state in accordance with the determination result of the stop signal. 具体可基于LIN协议完成,以LIN信号中的信息获得冷停机或热停机的判断结果。 Specific completed based on the LIN protocol, the information in the signal LIN determination result is obtained hot or cold stop shutdown.

[0112] C2.在热停机状态下调节电子膨胀阀至全闭。 [0112] C2. Electronic expansion valve in a hot shutdown state to the fully closed.

[0113] C3.在冷停机状态下,调节电子膨胀阀开启至全开度后至全闭; . [0113] C3 shutdown in the cold state, the electronic expansion valve opening degree to the fully closed to fully open;

[0114] C4.以所述电子膨胀阀在第四时间长度内完成全开及全闭为条件执行步骤C5;即控制电子膨胀阀完成自检。 [0114] C4 to complete the electronic expansion valve is fully opened and fully closed condition of the length of time a fourth step C5;. That completed the self-test electronic expansion valve control.

[0115] C5.调节所述电子膨胀阀开启至小开度。 [0115] C5. Regulating opening of said electronic expansion valve to a small opening degree. 同样,本实施例中,该小开度优选为电子膨胀阀全开度的10%_40%。 Also, in this embodiment, the small opening _40%, preferably 10% of the electronic expansion valve is fully open.

[0116] 本实施例中的自检步骤C3与第二实施例中的自检步骤原理相同,且均可有效利用LIN信号或者CAN信号完成,故本实施例不再赘述。 [0116] The present embodiment POST POST step C3 and step principle the same as the second embodiment, and can effectively use CAN or LIN signal completion signal, it will not be repeated embodiment of the present embodiment.

[0117]特别强调的是,对于电子膨胀阀自检功能的实现,理论上只要其能够在预定时间范围内自全闭至全开或者自全开至全闭,即视为该电子膨胀阀处于无故障状态。 [0117] Particular emphasis is given for achieving a self-test function electronic expansion valve, in theory, as long as it can be from the fully closed to fully open or fully closed to fully open from within a predetermined time range, i.e., the electronic expansion valve is considered trouble-free state. 应当理解, 本方案中完成全开、全闭进行自检判断为优选方案,另外,还可以采用其他信号进行辅助判断,如以电子膨胀阀在预定时间长度内有序完成全开、全闭两个动作且没有异常信号反馈来进行判断等等。 It should be understood that the present embodiment is completed fully open, fully closed self-test determines that the preferred embodiment, additionally, may also be used other auxiliary signal is determined, such as the electronic expansion valve is fully opened in order to complete within a predetermined length of time, fully closed two actions and no feedback signal is to be judged abnormal and the like. 显然地,基于本申请的核心设计构思应用前述两种单行程自检动作均属于本申请请求保护的范围。 Obviously, the core design concept of a single application of the two aforementioned self stroking operation based on the present disclosure of the present application are within the scope claimed.

[0118]以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。 [0118] The above are only preferred embodiments of the present invention, it should be noted that those of ordinary skill in the art, in the present invention without departing from the principles of the premise, can make various improvements and modifications, such modifications and modifications should also be regarded as the protection scope of the present invention.

Claims (14)

1. 一种汽车空调系统电子膨胀阀的控制方法,其特征在于,包括如下步骤: A. 启动控制;判断系统启动状态:热启动状态下,直接执行步骤B;冷启动状态下,调节电子膨胀阀至全闭;再开启至小开度,之后执行步骤B; B. 运行控制;在压缩机启动初始阶段,控制电子膨胀阀达到与压缩机的转速相对应的恒定开度,以与压缩机的转速相对应的所述恒定开度进入正常运行阶段控制; C. 停机控制; 步骤B中,将所述压缩机的转速划分多个转速区间,并根据每个转速区间的压缩机转速确定相对应的所述电子膨胀阀的恒定开度。 An automotive air conditioning system control method of the electronic expansion valve, characterized by comprising the steps of: A. start control; Analyzing System startup state: a warm start, perform Step B; the cold start state, the electronic expansion the valve to the fully closed; opening to a small opening degree and then, after performing step B; B. control operation; start at the initial stage of the compressor, the control electronic expansion valve and the compressor speed to achieve a constant degree of opening corresponding to the compressor the constant rotation speed corresponding to the degree of opening of the control into the normal operating phase; C. stop control; step B, the rotational speed of the compressor is divided into a plurality of speed range, and is determined in accordance with the compressor speed to each speed range a constant opening degree of the electronic expansion valve corresponding to.
2. 根据权利要求1所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤A中, 冷启动状态下,所述小开度具体为所述电子膨胀阀全开度的2%~20%。 The automotive air conditioning system control method of the electronic expansion valve according to claim, wherein, in step A, the cold start state, the small opening in particular 2% of the full throttle electronic expansion valve to 20%.
3. 根据权利要求2所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤A中, 冷启动状态下,调节电子膨胀阀至全开后,调节电子膨胀阀至全闭;并以所述电子膨胀阀在第一时间长度内完成全开及全闭为条件,调节电子膨胀阀开启至小开度。 The automotive air conditioning system control method of the electronic expansion valve of claim 2, characterized in that, in step A, the cold start state, adjustment of the electronic expansion valve to fully open, electronic expansion valve to the fully closed; and to complete the electronic expansion valve is fully opened and fully closed condition of the first length of time, an electronic expansion valve opening degree to a small opening.
4. 根据权利要求1所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤B中, 在压缩机启动初始阶段,在启动时间段内判断所述压缩机的转速是否在一定时间区间内保持在一个转速区间内,若是,则控制所述电子膨胀阀达到与相应转速区间相对应的恒定开度;若否,则控制所述电子膨胀阀达到启动时间段结束时刻的所述压缩机转速所在转速区间相对应的恒定开度,或者控制所述电子膨胀阀达到预设的初始启动开度。 The automotive air conditioning system control method of the electronic expansion valve according to claim, wherein, in step B, the initial stage of starting the compressor, the starting period is determined whether the rotation speed of the compressor at a certain time maintained within a speed range, and if yes, to control the electronic expansion valve corresponding to the rotational speed reaches a constant interval corresponding to the degree of opening interval; if not, then control the electronic expansion valve reaches the end time of the startup period compression speed range where the rotation speed corresponding to the constant opening degree, or controlling the electronic expansion valve reaches a predetermined opening degree of the initial startup.
5. 根据权利要求4所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,在压缩机启动初始阶段的启动时间段后,以所述压缩机的转速自第一转速区间变化至第二转速区间内,且维持第二时间长度为条件,控制所述电子膨胀阀自与所述第一转速区间所对应的恒定开度达到与所述第二转速区间所对应的恒定开度。 The automotive air conditioning system control method of the electronic expansion valve 4 according to claim, characterized in that, after the startup period starts at the initial stage of the compressor, to change the rotational speed of the compressor section from the first speed to the second the two speed range, and the length of the sustain time of the second condition, the control of the electronic expansion valve from said first constant speed range corresponding to a constant degree of opening and the opening degree corresponding to the second speed range.
6. 根据权利要求5所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤B中, 在所述正常运行阶段控制,根据所述压缩机的转速确定所述电子膨胀阀的开度预调节量so,根据蒸发器出口或者压缩机进口的制冷剂温度和压力计算实际过热度Tsh,并将所述实际过热度与预设的过热度阈值区间Tsh_set进行比较,获得开度调节增量As;将所述开度预调节量so与所述开度调节增量△ s累加后输出调节开度的控制信号s至所述电子膨胀阀的控制端。 The automotive air conditioning system control method of the electronic expansion valve according to claim, wherein, in step B, in the normal operating phase control, the rotational speed of the compressor determines the opening of the electronic expansion valve the amount of preconditioned so, according to the calculation of the actual degree of superheat Tsh of the evaporator or the compressor outlet pressure and temperature of the refrigerant inlet, and the actual degree of superheat to a preset degree of superheat is compared Tsh_set threshold value interval, adjusting the degree of opening obtained by the amount of As; preconditioning the opening degree of the opening degree amount of so adjusting the regulated output increment △ accumulation control signal s s opening degree to the control terminal of the electronic expansion valve.
7. 根据权利要求6所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,所述过热度阈值区间以基本过热度阈值曲线为基准形成一个封闭区间,正常过热度设定范围内的所述过热度阈值区间由基本过热度阈值曲线上下浮动一温度定值形成;过热度为〇°C时的所述过热度阈值区间设定为〇°C;过热度大于20°C时的所述过热度阈值区间设定为0°C。 The automotive air conditioning system control method of the electronic expansion valve 6 of the preceding claims, characterized in that the degree of superheat threshold value interval substantially superheat threshold reference curve forming a closed section, the normal superheat setting range the time of the degree of superheat is greater than 20 ° C; degree of superheat threshold value interval floating of substantially superheat threshold curve down a temperature value is formed; superheat to the superheat threshold interval set square ° C at square ° C said superheat threshold interval is set to 0 ° C.
8. 根据权利要求7所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,低负荷区和高负荷区的过热度阈值区间均小于等于正常负荷区的过热度阈值区间;所述低负荷区的过热度越低过热度阈值区间越小,所述高负荷区的过热度越高过热度阈值区间越小。 8. The automotive air conditioning system control method of claim 7 electronic expansion valve according to claim, characterized in that the threshold value interval superheat low load region and the high load region is equal to the degree of superheat is less than the threshold interval normal load region; the low the lower the superheat degree of superheat load area smaller threshold value interval, the higher the degree of superheat of the high-load region is smaller superheat threshold value interval.
9. 根据权利要求6所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,将所述压缩机的转速划分多个运行区间,并根据每个运行区间的压缩机转速确定相应的所述电子膨胀阀的开度预调节量so。 9. The automotive air conditioning system control method of claim 6 electronic expansion valve according to claim, wherein a plurality of dividing the rotational speed operation region of the compressor, and the compressor is determined according to the rotational speed corresponding to each operation region of the opening degree of said electronic expansion valve preconditioning amount so.
10. 根据权利要求9所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,以所述压缩机的转速满足在相应运行区间内维持第三时间长度为条件,根据所述压缩机的转速确定所述电子膨胀阀的开度预调节量SO。 The automotive air conditioning system 10. The control method according to claim 9 electronic expansion valve, characterized in that, in order to maintain the rotational speed of the compressor to meet the length of the third time interval corresponding operating conditions in accordance with the compressor determining the rotational speed of the electronic expansion valve opening degree amount of the preconditioning SO.
11. 根据权利要求1所述汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤C中, 判断系统停机状态:热停机状态下,调节电子膨胀阀至全闭;冷停机状态下,调节电子膨胀阀开启至小开度。 11. The control method for an automotive air conditioning system as claimed in claim electronic expansion valve, wherein, in step C, the stop state is determined the system: the thermal shutdown state, electronic expansion valve to the fully closed; cold stop state, adjusting an electronic expansion valve opening degree to a small opening.
12. 根据权利要求11所述汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤C中, 调节电子膨胀阀开启至全开度后至全闭;并以所述电子膨胀阀在第四时间长度内完成全开及全闭为条件,调节所述电子膨胀阀开启至小开度。 11 according to the automotive air conditioning system control method of an electronic expansion valve as claimed in claim, wherein the step C, the electronic expansion valve is opened to the fully closed to fully open degree; electronic expansion valve, and to the fourth fully open and fully closed to complete the length of time the condition, adjusting the electronic expansion valve opening degree to a small opening.
13. 根据权利要求12所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤C 中,所述小开度为电子膨胀阀全开度的10% - 40%。 13. The automotive air conditioning system control method 12 of the electronic expansion valve according to claim, wherein, in step C, the small opening degree of 10% of the electronic expansion valve is fully open - 40%.
14. 根据权利要求13所述的汽车空调系统电子膨胀阀的控制方法,其特征在于,步骤C 中,以LIN信号的信息获得热停机状态或者冷停机状态的判断结果。 14. The automotive air conditioning system control method of the electronic expansion valve 13 according to claim wherein, in step C, to obtain the information signal LIN standstill determination result of the heat or cold shutdown state.
CN201110298313.6A 2011-09-29 2011-09-29 The method of controlling an electronic expansion valve of an automobile air conditioning system CN103033008B (en)

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