CN101681177B - 运输制冷单元辅助功率 - Google Patents

运输制冷单元辅助功率 Download PDF

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CN101681177B
CN101681177B CN200780053245.9A CN200780053245A CN101681177B CN 101681177 B CN101681177 B CN 101681177B CN 200780053245 A CN200780053245 A CN 200780053245A CN 101681177 B CN101681177 B CN 101681177B
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N·S·奥沃德
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
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Abstract

一种辅助功率系统和方法分配并控制来自拖车箱体制冷系统的可利用的多余电功率。拖车箱体制冷系统可具有产生直流电(DC)的发电机,或者具有产生交流电(ac)的交流发电机。发电机/交流发电机产生功率以便给制冷系统负载供应动力,并且多余的发电功率可被分配给没有与制冷系统相关联的辅助负载。

Description

运输制冷单元辅助功率
技术领域
本发明总体上涉及运输制冷系统的领域。更具体的,本发明涉及依赖制冷需求从卡车拖车制冷单元提供辅助电功率的方法和系统。
背景技术
运输制冷系统,例如用在卡车拖车上的那些,通常采用机械联接轴驱动的压缩机或电动马达驱动的压缩机。在该机械配置中,例如柴油机的发动机,直接或间接联接到制冷压缩机。发动机还可通过采用带轮、三角带和类似物的另外的机械驱动来驱动制冷冷凝器风扇,蒸发器风扇和其他组件。
对于机械制冷系统而言,电功率是有限的。通常,唯一可利用的功率是来自制冷系统发动机蓄电池的可利用的12VDC。该低压可用于为拖车箱体内的照明提供功率或为提升式闸门机构提供功率。
在该用电配置中,发动机被联接到为所有制冷负载提供电功率的制冷系统的发电机或者交流发电机。制冷负载通常包括压缩机马达,冷凝器风扇马达,蒸发器风扇马达,电除霜加热器和其他电负载。
期望的是一种为辅助负载提供另外的功率的系统。
发明内容
发明人已发现在用电制冷系统中,发电机或者交流发电机产生的功率多于制冷负载所需要的充足功率并且该辅助功率可用于给制冷系统以外的辅助负载提供动力。
本发明的一个方面提供了从用于冷却拖车箱体的电运输制冷系统提供电功率给辅助电负载的方法。依照本发明该方面的方法开始于设定拖车箱体内部温度设定值,设定辅助电负载设定值,计算电运输制冷系统的总用电负载,计算电运输制冷系统的总用电负载和电运输制冷系统的额定发电容量之间的多余发电容量,以及当拖车箱体温度低于或者等于拖车箱体温度设定值并且所计算的多余发电容量大于辅助电负载设定值时,提供辅助功率。
本发明的一个或多个实施方式的细节在下文的附图和说明中予以介绍。通过说明书,附图以及权利要求书,本发明的其他特征,目的和优点将会变得很明显。
附图说明
图1是拖车箱体制冷系统辅助功率系统的示例性示意图。
图2是辅助功率系统的示例性方法。
具体实施方式
将参照附图描述本发明的实施方式,其中,在通篇中相同的标号代表相同的元件。此外,应理解的是,此处所采用的措词和术语是用于描述的目的,并且不应当被视为限制。此处采用“包括”、“包含”、或“具有”以及其变型是旨在包含其后所列出的项目及其等同物以及另外的项目。用语“装配”、“连接”、和“联接”被广泛使用,包含直接和间接的装配、连接和联接。此外,“连接”和“联接”并未限制为物理或机械的连接或联接。
本发明并未限制为附图中所描述或暗示的任何特殊的软件语言。多种可选择的软件语言也可用于实现本发明。
本发明分配并控制来自拖车箱体制冷系统的多余的可利用电功率。拖车箱体制冷系统可具有产生直流电(DC)的发电机,或者具有产生交流电(ac)的交流发电机。发电机/交流发电机产生功率从而给压缩机马达、冷凝器风扇马达、蒸发器风扇马达、电除霜加热器以及其他的制冷系统负载提供动力。发动机-发电机/交流发电机所产生的多余的功率可被分配并用于没有与制冷系统相关联的辅助负载。
没有与拖车箱体制冷系统相关联的各种负载可利用发动机-交流发电机/发电机作为电源而被供给动力。实例包括远程燃料罐加热器,远程风扇,远程照明设备,拖车地板加热装置以及其它。
通常的电拖车箱体制冷系统产生三相460Vac。利用变压器可使得该电压逐步降低或升高,以用于在不同电位下工作的用电负载。产生DC的电拖车箱体制冷系统可利用DC-DC转换器来逐步降低或升高发电机输出电压。由制冷系统供给动力的辅助负载可选择使用产生的输出电压,例如460Vac,或者可使用电压转换装置。
图1显示一个示例示意图。制冷系统通常包含发动机-发电机/交流发电机103,主分配总线105,以及用于分配功率给制冷系统负载的制冷总线106,制冷系统负载例如为压缩机107,蒸发器风扇109,冷凝器风扇111以及其他负载113。辅助功率系统利用功率计量组件115来监控发动机-发电机/交流发电机103的总功率输出,功率计量组件115可包含用于ac应用的电流变压器(CTs)和电位变压器(PTs),或者用于DC应用的电流和电压分流器。功率计量信号116联接到控制器117,控制器117计算制冷系统消耗的瞬时功率。控制器117可以由微处理器控制,并且具有温度设定值119输入和辅助负载设定值120输入。辅助负载设定值120代表发动机-发电机/交流发电机103的功率限制。辅助功率系统围绕该限制进行控制。
开关121联接到主总线105作为分接头给辅助负载总线123供应动力。辅助负载总线123直接地或者通过电压转换器131分配功率给辅助负载125,127,129。
温度元件133,例如热电偶或RTD(电阻式温度检测器),被放置在拖车箱体134内以获得拖车箱体内部温度。
作为实例,电制冷系统可采用具有24.5kW的机械功率输出的柴油发动机,其联接到460Vac、19kW三相交流发电机103。发动机-交流发电机103提供功率给460Vac压缩机107,依赖制冷需求,压缩机107会消耗大约5到10kW。多余的发电容量由以下公式决定:
多余的容量=发动机/交流发电机额定容量-总制冷负载。(1)
对于期望的-4°F(-20℃)的箱体内部温度以及86°F(30℃)的周围外界温度,压缩机107会消耗5kW。对于期望的32°F(0℃)的箱体温度以及86°F(30℃)的周围外界温度,压缩机107会消耗10kW。另外的功率被供应到冷凝器风扇109和蒸发器风扇111,其会消耗2.3kW。可利用的多余的容量依赖压缩机负载并且根据(1),范围可从6.7kW=19kW-(10kW+2.3kW)到11.7kW=19kW-(5kW+2.3kW)。
如图2所示,控制器117控制可利用的多余的功率量。使用者以kW设定预定的辅助负载设定值120(步骤201)并且以°F(或者℃)设定期望的拖车箱体内部温度设定值119,拖车箱体内部温度设定值119可以与制冷系统温度设定值相同。当制冷系统工作时(步骤203),控制器117计算制冷系统所消耗的功率(步骤205)。储存在控制器117中的记录是发动机-发电机/交流发电机103的额定输出。控制器117计算用于辅助负载的可利用的多余容量(步骤207)。
控制器117监控拖车箱体内部温度133并且将它与温度设定值119相比较。采用2.7°F(1.5℃)的死区(重设差值)(步骤209)。死区是设定值119的值和降低方向上的重设点之间的差。如果拖车箱体温度133大于或等于温度设定值119,制冷系统具有关于功率消耗的优先级,并且辅助负载开关121断开(如果是闭合的)以切断任何的辅助负载。如果拖车箱体温度低于或等于温度设定值119(低于2.7°F(1.5℃)的死区)(步骤209),(1)提供辅助负载可利用的容量数量(步骤213)。
如果可利用的容量大于辅助负载设定值120,控制器允许辅助开关121闭合,供应功率给辅助负载(步骤215)。如果可利用的容量小于或等于负载设定值120,辅助开关121断开并且辅助负载被切断。控制器117调整制冷系统压缩机调节阀108以卸载压缩机并减少制冷功率消耗(步骤217)。
控制器117基于电流限制(例如,发动机高速为26Amps,发动机低速为22Amps)来调节压缩机吸入调节阀108。负载设定值120可设定为较低的值以允许更多的或连续的辅助功率可利用。当拖车箱体134的温度133低于设定值119时,如果单元处于开始/停止模式,发动机103会停机以节省燃料。通过本发明,如果拖车箱体134的温度133低于设定值119,该单元将切断其冷却负载(压缩机107和蒸发器风扇),并且发电机/发动机将继续运转以为辅助负载提供功率。另一工作模式是连续运转,其中,如果温度低于设定值,该单元不会停机但是将会从冷到热地循环。
已经描述了本发明的一个或更多的实施方式。然而,应当理解的是,可做出多种变型而不脱离本发明的精神和范围。相应的,其他实施方式处于下列权利要求的范围之内。

Claims (6)

1.一种从用于冷却拖车箱体的电运输制冷系统提供电功率给辅助电负载的方法,包括:
设定拖车箱体内部温度设定值;
设定辅助电负载设定值;
计算所述电运输制冷系统的总用电负载;
计算所述电运输制冷系统的总用电负载和电运输制冷系统的额定发电容量之间的多余发电容量;以及
当拖车箱体温度低于或等于所述拖车箱体内部温度设定值并且所计算的多余发电容量大于所述辅助电负载设定值时,提供辅助功率。
2.依照权利要求1所述的方法,进一步包括:当所述拖车箱体温度低于或等于所述拖车箱体内部温度设定值时并且当所计算的多余发电容量小于或等于所述辅助电负载设定值时,调节压缩机吸入调节阀以减少总制冷系统负载。
3.依照权利要求2所述的方法,进一步包括:当辅助电负载需要不同的电压等级时,在所述辅助电负载和电运输制冷系统辅助功率之间采用电压转换器。
4.一种从用于冷却拖车箱体的电运输制冷系统提供电功率给辅助电负载的系统,包括:
用于设定拖车箱体温度设定值的装置;
用于设定辅助电负载设定值的装置;
用于计算所述电运输制冷系统的总用电负载的装置;
用于计算所述电运输制冷系统的总用电负载和电运输制冷系统的额定发电容量之间的多余发电容量的装置;以及
当拖车箱体温度低于或者等于所述拖车箱体温度设定值并且所计算的多余发电容量大于所述辅助电负载设定值时,用于提供辅助功率的装置。
5.依照权利要求4所述的系统,进一步包括:当所述拖车箱体温度低于或者等于所述拖车箱体温度设定值时并且当所计算的多余发电容量小于或者等于所述辅助电负载设定值时,用于调节压缩机吸入调节阀以减少总制冷系统负载的装置。
6.依照权利要求5所述的系统,进一步包括:当辅助电负载需要不同的电压等级时,在所述辅助电负载和电运输制冷系统辅助功率之间联接电压转换器。
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US9085218B2 (en) 2015-07-21
CN101681177A (zh) 2010-03-24
WO2008153518A1 (en) 2008-12-18
US20100171364A1 (en) 2010-07-08
BRPI0721710A2 (pt) 2013-01-22
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