CN102278242A - 在燃料箱中调节压力的方法以及燃料箱*** - Google Patents
在燃料箱中调节压力的方法以及燃料箱*** Download PDFInfo
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Abstract
本发明涉及一种用于在燃料箱(10)中调节压力的方法。在相对于周围环境出现过压时,蒸发的燃料从燃料箱(10)中逸出,并被引导到用于蒸发的燃料的至少一种物质的中间存储器(18)。在此,由至少一个不同于压力的参量,或至少一个以数据形式提供的信息,来控制排气装置(14),蒸发的燃料通过此排气装置逸出。燃料箱(10)中的压力因此能够可变地被调节。本发明还涉及一种燃料箱***,这种方法可用于此燃料箱***。
Description
技术领域
本发明涉及一种在权利要求1前序部分中所述类型的、用来在燃料箱中调节压力的方法,还涉及一种在权利要求4前序部分中所述类型的燃料箱***。
背景技术
人们期望,降低碳氢化合物从具有内燃机的机动车到周围环境中的排放。为此,机动车通常具有活性炭过滤器,该活性炭过滤器通常设置在装有可燃燃料的机动车燃料箱和周围环境之间。此活性炭过滤器起着用于燃料的已蒸发的碳氢化合物的中间存储器的作用。它通常定期地通过新鲜空气流来再生,此新鲜空气流接纳被活性炭过滤器存储的碳氢化合物,并输送给内燃机。通过活性炭过滤器的这个所谓的扫气阶段,要确保,活性炭过滤器总是具有足够大的容纳能力,用来存储碳氢化合物。
但这种扫气阶段尤其在混合动力车辆中不能经常实施,这是因为在那里仅是有时候驱动内燃机。但为了确保,活性炭过滤器总是具有足够的能力来容纳碳氢化合物,例如DE 10 2008 017 004 A1描述了一种具有权利要求1和4的前序部分的相应特征的箱通风装置以及用于实现箱通风的方法。在那里通过调节一定的箱内压(其大于环境压力),可减少在箱中产生的碳氢化合物的量。为此,在箱与用来连接所述箱和活性炭过滤器的连接管路之间设置有可电控的止回阀。现在如果加热所述箱,则箱中的压力被提高到某一可确定的压力阈值。存在于燃料中的碳氢化合物因此更多地留在其液态阶段。一旦超过了此阈值,则打开止回阀,然后含碳氢化合物的蒸气从箱中逸出。此蒸气然后通过连接管路被引导入活性炭过滤器中,并被活性炭过滤器吸收,因此箱中的压力再次降低。一旦箱中的压力再次低于阈值,则再次关闭止回阀。
在此缺点是,在那里不能可变地调节箱中的压力。必须事先确定一定的压力阈值。通常会把非常高的压力选定为阈值,因此蒸气极少能从箱中逸出。亦即,仅将止回阀用作紧急阀,以便避免由于非常高的压力而导致损坏。整个燃料箱***必须非常复杂地设计,以便确保在箱中有规律地出现高压。这种箱***的制造成本因此非常高。此外,活性炭过滤器的容纳能力有时根本不能完全利用。
发明内容
因此,本发明的目的是,提供一种按权利要求1前序部分所述的、用来在燃料箱中调节压力的方法,还提供一种按权利要求4前序部分所述的燃料箱***,借助它们能够可变地调节燃料箱中的压力,并且通过它们可降低箱***的制造成本。
此目的通过按权利要求1所述的方法和按权利要求4所述的燃料箱***来实现。
按照本发明,在一种具有权利要求1前序部分的特征的方法中,根据至少一个不同于压力的参量,或根据至少一个以数据形式提供的信息,来控制通风装置。
即,没有为箱空间中的压力预先设定固定的、在被超出时燃料蒸气通过通风装置从燃料箱向中间存储器逸出的阈值。在此可简单地应用一信息或其它参量的实际值,以便适当地打开或关闭通风装置。因此,能够可变地调节存在于燃料箱***的燃料箱中的压力。所述箱***可构造得更简单,并且可更经济地制造。
如果所述至少一个不同于压力的参量或至少一个以数据形式提供的信息描述了中间存储器的存储状态,则可非常好地利用中间存储器的存储能力。例如还可能的是,当中间存储器还有许多存储能力时,在燃料箱中相对于周围环境的过压很小的情况下,蒸发的燃料便已从燃料箱中逸出。因此,可简单且节省成本地避免,在燃料箱中经常出现非常高的压力。
通风装置可根据在从燃料箱中逸出的燃料蒸气的流动方向上位于存储器后面的空燃比λ的实际值来控制。从该空燃比λ的实际值、或从该比例与可确定的正常值之间的偏差,可简单地推导出中间存储器的负载状态。在此,可通过合适的测量单元以已知的方式确定此空燃比λ。
有利的是,还可额外地根据燃料箱中的压力来控制通风装置。例如可确定压力的一在出现时将通风装置关闭的阈值。因此,在极少出现的、燃料箱中的压力非常高的情况下,可阻止燃料蒸气的逸出。这样,即使中间存储器还具有足够的容纳能力,因此也能避免过强地流过中间存储器,该过强的流过可能最终会导致含碳氢化合物的蒸气释放到环境中去。
按照本发明的燃料箱***至少具有一用于可燃燃料的燃料箱,还具有用于暂存燃料的至少一种被蒸发的物质的中间存储器。此外,按照本发明的燃料箱***还具有引导装置,在相对于周围环境出现过压时通过通风装置从燃料箱中逸出的燃料蒸气通过该引导装置可被引导至中间存储器。在此,通风装置可通过控制单元来控制,此控制单元设计用于根据至少一个不同于压力的参量或根据至少一个以数据形式提供的信息来控制此通风装置。因此,能够显著可变地调节燃料箱中的压力。不再需要事先确定一通常必须为燃料箱中的压力实现大的活动余地的压力阈值。此燃料箱***可较经济地制成。
如果通风装置构造成阀、尤其构造成比例阀,则所述控制可通过控制单元以与不同于压力的参量或提供的信息特别好地相匹配的方式来进行。作为连续阀,比例阀可连续地转换阀门开口。
中间存储器可构造成活性炭过滤器,该活性炭过滤器以已知的方式非常有效地吸附蒸发的燃料的碳氢化合物。
附图说明
下面参照附图描述了本发明的优选实施例,其中此附图示意性地示出了燃料箱***。
具体实施方式
在车辆的燃料箱10中装有可燃的燃料12。根据燃料的组成成份,并根据燃料箱10中的压力和温度,构成燃料12的物质(例如碳氢化合物)会蒸发。
为了降低在燃料箱10中由此产生的碳氢化合物的量,将燃料箱10中的压力提高并超过环境压力。这例如通过升高燃料箱10中的温度来实现。尽管如此,燃料蒸气仍具有一定量的碳氢化合物。
如果关闭了燃料箱10的比例阀14,则尽管存在着过压,具有碳氢化合物的蒸发的燃料也不会通过管路16(其通向活性炭过滤器18)从燃料箱10中逸出。
在此,比例阀14的开启和关闭由控制单元20来控制。为此,该控制单元从以已知方式构造的测量单元中接收空燃比λ的实际值,该测量单元用于测量此比例,该测量单元例如为λ传感器。可利用在来自燃料箱10的燃料蒸气的流动方向上定位在活性炭过滤器18的后面的λ传感器。从λ的实际值与λ的确定的预定值之间的偏差中,可推导出活性炭过滤器18的负载状态。如果该活性炭过滤器还有足够的能力从蒸发的燃料中吸收碳氢化合物,则控制单元20这样控制比例阀14,使得当燃料箱10中相对于周围环境的过压较低时,蒸发的燃料便已被通过连接管路16向活性炭过滤器18引导了。
因此可非常好地充分利用活性炭过滤器18的容纳能力。还可避免,燃料箱10中的压力经常非常大,因此燃料箱***整体上可经济得多地被制造。
在空间上与比例阀14相互分开地、与比例阀14并行地设置有低压阀15。通过该低压阀可保护燃料箱10例如不出现过大的负压。
备选地还可设想,控制单元20根据其它参量或信息来控制比例阀14。因此,可例如通过其它专门的测量设备来确定活性炭过滤器18的预负荷。例如,可根据活性炭过滤器18是否正好已被新鲜空气流流过并因此活性炭过滤器的之前被占据的吸收位置已重新再生的信息来进行所述控制。于是,当燃料箱10中相对于周围环境的压力较低时,比例阀14便已可被打开。
Claims (6)
1.一种用于在燃料箱(10)中调节压力的方法,在此方法中,蒸发的燃料在相对于周围环境出现过压时从燃料箱(10)中通过通风装置(14)逸出,并被向中间存储器(18)引导,所述中间存储器用于蒸发的燃料的至少一种物质,其特征在于,根据至少一个不同于压力的参量,或根据至少一个以数据形式提供的信息,来控制所述通风装置(14)。
2.按权利要求1所述的用于通风的方法,其特征在于,所述至少一个不同于压力的参量或至少一个以数据形式提供的信息描述了所述中间存储器(18)的存储状态。
3.按权利要求1或2所述的用于通风的方法,其特征在于,根据燃烧空气比例λ的实际值,来控制所述通风装置(14)。
4.一种燃料箱***,该燃料箱***至少具有:一用于可燃燃料(12)的燃料箱(10);用于暂存所述燃料(12)的至少一种已蒸发的物质的中间存储器(18);引导装置(16),在相对于周围环境出现过压时通过一通风装置(14)从所述燃料箱(10)中逸出的燃料蒸气通过该引导装置能被引导至所述中间存储器(18),其特征在于,所述通风装置(14)能通过一控制单元(20)来控制,所述控制单元设计用于根据至少一个不同于压力的参量或根据至少一个以数据形式提供的信息来控制所述通风装置(14)。
5.按权利要求4所述的燃料箱***,其特征在于,所述通风装置(14)构造成阀,尤其构造成比例阀。
6.按权利要求4或5所述的燃料箱***,其特征在于,所述中间存储器(18)构造成活性炭过滤器。
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DE102010014558.0A DE102010014558B4 (de) | 2010-04-10 | 2010-04-10 | Verfahren zum Druckeinstellen in einem Kraftstofftank und Kraftstofftanksystem |
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DE102011106008B4 (de) | 2011-06-30 | 2018-10-31 | Audi Ag | Verfahren zum Betreiben eines Kraftstoffsystems sowie Kraftstoffsystem |
US9829894B2 (en) | 2012-03-24 | 2017-11-28 | Audi Ag | Method for operating a tank device, and corresponding tank device |
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JP6129722B2 (ja) | 2013-11-25 | 2017-05-17 | 愛三工業株式会社 | 蒸発燃料処理装置 |
DE102014017159B4 (de) | 2013-11-25 | 2017-01-26 | Aisan Kogyo Kabushiki Kaisha | Kraftstoffdampfverarbeitungsvorrichtung |
JP6073212B2 (ja) | 2013-12-06 | 2017-02-01 | 愛三工業株式会社 | 蒸発燃料処理装置 |
JP6133201B2 (ja) | 2013-12-06 | 2017-05-24 | 愛三工業株式会社 | 蒸発燃料処理装置 |
JP6087266B2 (ja) | 2013-12-06 | 2017-03-01 | 愛三工業株式会社 | 蒸発燃料処理装置 |
JP6177675B2 (ja) | 2013-12-06 | 2017-08-09 | 愛三工業株式会社 | 蒸発燃料処理装置 |
DE102015012656A1 (de) | 2014-10-22 | 2016-04-28 | Audi Ag | Verfahren zum Betreiben einer Kraftstoffanlage für ein Kraftfahrzeug sowie entsprechende Kraftstoffanlage |
DE102015005754A1 (de) | 2015-05-05 | 2016-11-10 | Audi Ag | Magnetventileinrichtung für ein Kraftfahrzeug |
DE102015010354B4 (de) | 2015-08-06 | 2017-03-16 | Audi Ag | Betriebsmitteltankanordnung für ein Kraftfahrzeug |
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CN104245386B (zh) * | 2012-03-24 | 2017-02-22 | 奥迪股份公司 | 用于运行储箱***的方法以及相应的储箱*** |
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DE102010014558A1 (de) | 2011-10-13 |
US20120085424A1 (en) | 2012-04-12 |
CN102278242B (zh) | 2015-05-06 |
DE102010014558B4 (de) | 2015-06-18 |
US8607765B2 (en) | 2013-12-17 |
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