JP5054625B2 - A vehicle equipped with a thermal insulation cover for a storage tank of urea aqueous solution and an exhaust purification device including the storage tank - Google Patents

A vehicle equipped with a thermal insulation cover for a storage tank of urea aqueous solution and an exhaust purification device including the storage tank Download PDF

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JP5054625B2
JP5054625B2 JP2008178934A JP2008178934A JP5054625B2 JP 5054625 B2 JP5054625 B2 JP 5054625B2 JP 2008178934 A JP2008178934 A JP 2008178934A JP 2008178934 A JP2008178934 A JP 2008178934A JP 5054625 B2 JP5054625 B2 JP 5054625B2
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storage tank
area
cover
aqueous solution
urea aqueous
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JP2010019135A (en
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慶介 阿部
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Mitsubishi Fuso Truck and Bus Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Description

本発明は、排ガス中の窒素酸化物を尿素水溶液を利用して浄化する内燃機関（以下、エンジンという）の排気浄化装置に係わり、尿素水溶液の貯蔵タンクのための保温用カバー及び排気浄化装置を備えた車両に関するものである。   The present invention relates to an exhaust gas purification device for an internal combustion engine (hereinafter referred to as an engine) that purifies nitrogen oxides in exhaust gas by using an aqueous urea solution, and includes a heat insulation cover for an urea aqueous solution storage tank and an exhaust gas purification device. It relates to a vehicle provided.

エンジンの排ガス中の窒素酸化物を浄化する排気浄化装置に、添加剤として尿素水溶液を利用した選択還元触媒システム（以下、尿素ＳＣＲシステムという。）が知られている。この尿素ＳＣＲシステムは、排気通路中の選択還元型ＮＯx触媒（以下、ＳＣＲ触媒という。）の上流側に噴射ノズルユニットを備え、この噴射ノズルユニットから尿素水溶液を噴射供給することで、排ガス中に尿素を供給し、斯かる尿素を加水分解してアンモニアを生成し、このアンモニアによりＳＣＲ触媒において、排ガス中の窒素酸化物を無害な窒素と水に還元するというものである。   A selective reduction catalyst system (hereinafter referred to as a urea SCR system) using an aqueous urea solution as an additive is known as an exhaust purification device for purifying nitrogen oxides in engine exhaust gas. This urea SCR system includes an injection nozzle unit on the upstream side of a selective reduction type NOx catalyst (hereinafter referred to as SCR catalyst) in an exhaust passage, and an aqueous urea solution is injected from the injection nozzle unit into the exhaust gas. Urea is supplied and the urea is hydrolyzed to produce ammonia, and the ammonia is used to reduce nitrogen oxides in the exhaust gas to harmless nitrogen and water in the SCR catalyst.

この尿素ＳＣＲシステムにおいては、尿素水溶液は貯蔵タンクに貯蔵されており、この貯蔵タンクから噴射ノズルユニットに向けて尿素水溶液が供給される。
ところで、尿素水溶液は、−１１℃以下になると凍結する。そのため、尿素ＳＣＲシステムを搭載した車両が寒冷地で使用される場合、あるいは、高地など寒冷地域を通過するような場合、貯蔵タンク内の尿素水溶液が凍結し、噴射ノズルに向けて尿素水溶液を供給できず、噴射ノズルから尿素水溶液が噴射できない不具合が生じることがある。 In this urea SCR system, the urea aqueous solution is stored in a storage tank, and the urea aqueous solution is supplied from the storage tank toward the injection nozzle unit.
By the way, the urea aqueous solution freezes when it becomes −11 ° C. or lower. Therefore, when a vehicle equipped with the urea SCR system is used in a cold region, or when passing through a cold region such as a highland, the urea aqueous solution in the storage tank freezes and the urea aqueous solution is supplied to the injection nozzle. This may cause a problem that the urea aqueous solution cannot be injected from the injection nozzle.

そこで、このような尿素水溶液の凍結を防止する機能を備えた尿素ＳＣＲシステムを採用した排気浄化装置として、例えば、特許文献１に記載の排気ガス浄化触媒用還元剤保温装置及びそれを組込んだ排気ガス浄化装置が挙げられる。
特許文献１に記載の還元剤保温装置の凍結防止システムは、尿素水溶液の貯蔵タンク及びポンプを含む供給管系にその外表面全体に亘って配置された電熱線と、この電熱線上に設けられた断熱材からなる包囲層と、貯蔵タンク内に設けられた電熱線加熱手段と、貯蔵タンク内の尿素水溶液の温度及び外気温等の情報に基づき電熱線への通電を制御する制御装置とを備えている。この凍結防止システムおいては、尿素水溶液の温度が凍結温度付近にまで降下したことが検出されたとき、電熱線に通電して電熱線を発熱させ、尿素水溶液の凍結防止を行うというものである。
特開２０００−０２７６２７号公報 Therefore, as an exhaust purification device that employs a urea SCR system having a function of preventing the urea aqueous solution from freezing, for example, a reducing agent heat retention device for an exhaust gas purification catalyst described in Patent Document 1 and the same are incorporated. An exhaust gas purification device can be mentioned.
The anti-freezing system of the reducing agent heat retention device described in Patent Document 1 is provided on a heating line disposed over the entire outer surface of a supply pipe system including a storage tank and a pump for urea aqueous solution, and the heating line. A surrounding layer made of a heat insulating material, a heating wire heating means provided in the storage tank, and a control device for controlling energization to the heating wire based on information such as the temperature of the urea aqueous solution in the storage tank and the outside temperature. ing. In this antifreezing system, when it is detected that the temperature of the urea aqueous solution has dropped to near the freezing temperature, the heating wire is energized to generate heat and the urea aqueous solution is prevented from freezing. .
JP 2000-027627 A

ところで、特許文献１に記載の凍結防止システムおいては、電熱線及び断熱材の包囲層を供給管系の配管及び貯蔵タンクの全域に亘って配設しなければならず、しかも貯蔵タンクから配管の全体を均一に温度制御する必要があり、凍結防止システム全体として高価なものとなる。
しかしながら、車両によっては、寒冷地で全く使用しない、あるいは、一時的にしか寒冷地で使用しない車両もある。このような車両については、ほとんど使用しない高価な凍結防止システムが搭載されていることになり、不経済である。 By the way, in the antifreezing system described in Patent Document 1, the surrounding layer of the heating wire and the heat insulating material must be disposed over the entire area of the piping and the storage tank of the supply pipe system, and the piping from the storage tank. It is necessary to uniformly control the temperature of the entire system, and the entire freeze prevention system becomes expensive.
However, some vehicles may not be used at all in cold regions, or may be used only temporarily in cold regions. Such a vehicle is equipped with an expensive anti-freezing system that is rarely used, which is uneconomical.

本発明はこのような問題点を解決するためになされたもので、その目的とするところは、尿素水溶液貯蔵タンクのための高価な凍結防止ステムを省略することができる尿素水溶液の貯蔵タンクのための保温カバーおよび排気浄化装置を備えた車両を提供することにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a urea aqueous solution storage tank in which an expensive antifreeze stem for the urea aqueous solution storage tank can be omitted. An object of the present invention is to provide a vehicle including a heat retaining cover and an exhaust purification device.

上記目的を達成するため、本発明の尿素水溶液の貯蔵タンク用保温カバーは、内燃機関の排気通路に設けられ、選択還元型ＮＯｘ触媒と、直方体状をなす貯蔵タンクに貯蔵された尿素水溶液を前記選択還元型ＮＯｘ触媒の上流側の排ガス中に供給する尿素水溶液供給手段とを備えた内燃機関の排気浄化装置において、前記貯蔵タンクを覆うための保温カバーであって、保温性を有する素材で構成されているカバー本体と、前記カバー本体を前記貯蔵タンクに着脱自在に掛止する掛止手段とを備え、前記カバー本体は、前記貯蔵タンクを包み込み可能な布帛からなるシートと、前記シートに配設された面ファスナとを有し、前記シートは、前記貯蔵タンクの前壁の全体を覆うことが可能な前面域と、前記前面域の一方の側縁に連なり、前記貯蔵タンクの右側壁の全体を覆うことが可能な右側面域と、前記右側面域における前記前面域とは反対側の側縁に連なり、前記貯蔵タンクの後壁の右半分を覆うことが可能な右後面折込域と、前記右側面域の下端縁に連なり、前記貯蔵タンクの底壁の一部を覆うことが可能な右底面折込域と、前記前面域の他方の側縁に連なり、前記貯蔵タンクの左側壁の全体を覆うことが可能な左側面域と、前記左側面域における前記前面域とは反対側の側縁に連なり、前記貯蔵タンクの後壁の左半分を覆うことが可能な左後面折込域と、前記左側面域の下端縁に連なり、前記貯蔵タンクの底壁の一部を覆うことが可能な左底面折込域と、前記前面域の下端縁に連なり、前記右底面折込域及び前記左底面折込域を介在させて前記貯蔵タンクの底壁の全体を覆うことが可能な底面域と、前記底面域における前記前面域とは反対側の端縁に連なり、前記右後面折込域及び前記左後面折込域を介在させて前記貯蔵タンクの後壁の全体を覆うことが可能な後面域とを含み、前記面ファスナは、前記右後面折込域及び前記左後面折込域の表面と、前記後面域の裏面とに位置付けられており、前記カバー本体は、前記シートを前記貯蔵タンクの外周に沿って折込んで、前記貯蔵タンクの外周面を覆い、前記右後面折込域及び前記左後面折込域と前記後面域とが重なり合った部分を前記面ファスナで相互に結合して前記貯蔵タンクに装着されることを特徴とするものである（請求項１）。 In order to achieve the above object, a storage cover for a urea aqueous solution storage tank according to the present invention is provided in an exhaust passage of an internal combustion engine, and includes a selective reduction NOx catalyst and a urea aqueous solution stored in a rectangular parallelepiped storage tank. In the exhaust gas purification apparatus for an internal combustion engine provided with urea aqueous solution supply means for supplying the exhaust gas on the upstream side of the selective reduction type NOx catalyst, the heat purification cover for covering the storage tank, comprising a material having heat insulation properties A cover main body, and a hooking means for detachably hooking the cover main body to the storage tank. The cover main body is a sheet made of a fabric capable of wrapping the storage tank, and is disposed on the sheet. A front surface area capable of covering the entire front wall of the storage tank; and one side edge of the front surface area. A right side area that can cover the entire right side wall of the tank and a side edge of the right side area opposite to the front area, and can cover the right half of the rear wall of the storage tank A right rear fold area, and a right bottom fold area that can be connected to the lower edge of the right side area, and can cover a part of the bottom wall of the storage tank, and another side edge of the front area, and the storage A left side area that can cover the entire left side wall of the tank and a side edge of the left side area opposite to the front side area, and can cover the left half of the rear wall of the storage tank A left rear folding area, and a left bottom folding area that can cover a part of the bottom wall of the storage tank, and a left bottom folding area that can cover a part of the bottom wall of the storage tank, and a right bottom folding area. Cover the entire bottom wall of the storage tank with the area and the left bottom folding area interposed. A bottom surface area that can be connected to the edge of the bottom surface area opposite to the front surface area, and covers the entire rear wall of the storage tank with the right rear surface folding area and the left rear surface folding area interposed therebetween. The surface fastener is positioned on the front surface of the right rear surface folding area and the left rear surface folding area, and on the back surface of the rear surface area, and the cover body includes the seat. Fold along the outer periphery of the storage tank, cover the outer peripheral surface of the storage tank, and connect the right rear surface folding area and the left rear surface folding area and the rear surface area overlapping each other with the surface fastener, It is mounted on a storage tank (claim 1).

請求項１の尿素水溶液の貯蔵タンク用保温カバーは、尿素水溶液の貯蔵タンクに着脱自在であるので、必要なときに貯蔵タンクに装着すれば、尿素水溶液を十分に保温し、凍結を防止することができる。このため、車両において高価な凍結防止システムを省略することができる。また、この保温カバーによれば、各種容量の貯蔵タンクにもフレキシブルに対応することができ、汎用性に優れる。
また、前記布帛は、防水性および耐火性を備えている構成とすることが好ましい（請求項２）。 The heat retention cover for the urea aqueous solution storage tank according to claim 1 is detachable from the urea aqueous solution storage tank, so that when the urea aqueous solution is attached to the storage tank when necessary, the urea aqueous solution can be sufficiently warmed to prevent freezing. Can do. For this reason, an expensive freeze prevention system can be omitted in the vehicle. Moreover, according to this heat insulation cover, it can respond | correspond flexibly also to the storage tank of various capacity | capacitance, and is excellent in versatility.
Moreover, it is preferable that the fabric has a waterproof and fireproof structure (claim 2).

請求項２の尿素水溶液の貯蔵タンク用保温カバーによれば、防水性と耐火性を備えているので、過酷な使用環境にも耐えることができる。また、軽量であるため、保温カバーの取り付け取り外しが楽に行える。
また、前記カバー本体は、外表面層としての前記布帛の内側に貼り付けられた発泡体層と、前記発泡体層の内側に貼り付けられた二層の耐熱層とを更に有する多層構造をなし、前記耐熱層の層間に加熱手段を含む構成とすることが好ましい（請求項３）。 According to the heat retention cover for the storage tank of urea aqueous solution of claim 2, since it has waterproofness and fire resistance, it can withstand harsh use environment. In addition, since it is lightweight, it is easy to attach and remove the heat insulation cover.
The cover body has a multilayer structure further including a foam layer attached to the inside of the fabric as an outer surface layer and two heat-resistant layers attached to the inside of the foam layer . It is preferable that a heating means is included between the heat-resistant layers .

請求項３の尿素水溶液の貯蔵タンク用保温カバーによれば、加熱手段により尿素水溶液を加熱することができるので、尿素水溶液の温度低下をより有効に抑えることができる。
具体的には、前記加熱手段は、電熱線であり、家庭用電源または車両搭載バッテリより給電を受ける構成とすることが好ましい（請求項４）。
請求項４の尿素水溶液貯蔵タンク用保温カバーによれば、簡単な構成で尿素水溶液を加熱することができる。 According to the heat retention cover for the urea aqueous solution storage tank according to the third aspect, the urea aqueous solution can be heated by the heating means, so that the temperature drop of the urea aqueous solution can be more effectively suppressed.
Specifically, the heating means is a heating wire, and is preferably configured to receive power from a household power supply or a vehicle-mounted battery (Claim 4).
According to the heat retaining cover for the urea aqueous solution storage tank of claim 4, the urea aqueous solution can be heated with a simple configuration.

また、本発明による車両は、内燃機関の排気通路に設けられ、選択還元型ＮＯｘ触媒と、貯蔵タンクに貯蔵された尿素水溶液を前記選択還元型ＮＯｘ触媒の上流側の排ガス中に供給する尿素水溶液供給手段とを含む内燃機関の排気浄化装置を備えた車両において、請求項１〜５の何れかに記載の保温カバーを収納する収納域と、前記貯蔵タンク内の尿素水溶液の温度を検出する温度検出手段と、前記温度検出手段により検出された温度が設定温度以下になった場合、乗員に対し前記保温カバーを前記貯蔵タンクに装着すべきことを指示する指示手段とを備えていることを特徴とするものである（請求項６）。 Also, a vehicle according to the present invention, provided in an exhaust passage of an internal combustion engine, the selective reduction type and the NOx catalyst, the urea supply the urea aqueous solution stored in a storage tank into the exhaust gas upstream of the selective reduction type NOx catalyst A vehicle equipped with an exhaust gas purification device for an internal combustion engine including an aqueous solution supply means, wherein the temperature of the urea aqueous solution in the storage area for storing the heat insulation cover according to any one of claims 1 to 5 and the storage tank is detected. A temperature detection unit; and an instruction unit that instructs the occupant to attach the heat insulation cover to the storage tank when the temperature detected by the temperature detection unit is lower than a set temperature. It is a characteristic (claim 6 ).

請求項６の車両によれば、外気温度が低下する環境（冬季や高地等）で車両を使用し、尿素水溶液の温度が尿素水溶液の凝固点付近まで低下した場合、乗員に対し尿素水溶液の貯蔵タンク用保温カバーを装着すべきことが指示される。指示を受けた乗員は、保温用カバーを尿素水溶液の貯蔵タンクに装着することにより尿素水溶液の凍結を有効に防止することができ、尿素水溶液の噴射が不能になることを防ぐことができる。 According to the vehicle of claim 6 , when the vehicle is used in an environment where the outside air temperature decreases (winter season, high altitude, etc.) and the temperature of the urea aqueous solution decreases to near the freezing point of the urea aqueous solution, It is instructed that a thermal insulation cover should be installed. The occupant who receives the instruction can effectively prevent the urea aqueous solution from being frozen by attaching the heat insulation cover to the urea aqueous solution storage tank, and can prevent the urea aqueous solution from being jetted out.

請求項１〜５に記載の尿素水溶液の貯蔵タンク用保温カバーによれば、高価な凍結防止システムを搭載しなくても、尿素水溶液の凍結を防止することができる。よって、高価な凍結防止システムを省略することができ、車両の製造コスト削減に寄与する。
請求項６に記載の車両によれば、尿素水溶液の温度が凝固点付近まで低下した場合、保温カバーを貯蔵タンクに装着すべきことを乗員に指示するので、高価な凍結防止システムを省略していても、尿素水溶液が凍結する前に保温カバーを貯蔵タンクに装着することができ、尿素水溶液の凍結を有効に防止することができる。よって、車両が寒冷地で使用されることがあっても、尿素水溶液の噴射が不能になることを防ぐことができ、尿素ＳＣＲシステムを安定して機能させることができる。 According to the heat insulation cover for a storage tank of an aqueous urea solution according to claims 1 to 5 , freezing of the aqueous urea solution can be prevented without mounting an expensive antifreezing system. Therefore, an expensive anti-freezing system can be omitted, which contributes to a reduction in vehicle manufacturing costs.
According to the vehicle of the sixth aspect, when the temperature of the urea aqueous solution decreases to near the freezing point, the occupant is instructed to install the heat insulation cover on the storage tank, so that an expensive anti-freezing system is omitted. In addition, the heat insulating cover can be attached to the storage tank before the urea aqueous solution freezes, and the urea aqueous solution can be effectively prevented from freezing. Therefore, even when the vehicle is used in a cold region, it is possible to prevent the injection of the urea aqueous solution from being disabled, and the urea SCR system can function stably.

以下、本発明に係る尿素水溶液貯蔵タンク用保温カバーを装着する車両の実施の形態を、図面を参照して説明する。
（参考例１）
図１は参考例１に係る車両２の車台構造の概略構成を示している。
車両２の車台はフレーム４を備えている。フレーム４は、２本のサイドレール６と、これらサイドレール６の間に渡した複数のクロスメンバ８とを組み合わせて得られている。フレーム４には、サスペンションを介して車輪１０が装着されている。そして、このフレーム４の前方には運転室１２が配設されるとともに、運転室１２の床下部分にエンジン１４が載置されている。更に、一方のサイドレール６の中央部には燃料を貯蔵する燃料タンク１６が取り付けられている。 DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a vehicle equipped with a heat retaining cover for a urea aqueous solution storage tank according to the present invention will be described with reference to the drawings.
( Reference Example 1)
FIG. 1 shows a schematic configuration of a chassis structure of a vehicle 2 according to Reference Example 1.
The chassis of the vehicle 2 includes a frame 4. The frame 4 is obtained by combining two side rails 6 and a plurality of cross members 8 passed between the side rails 6. Wheels 10 are attached to the frame 4 via suspensions. A driver's cab 12 is disposed in front of the frame 4, and an engine 14 is placed under the floor of the driver's cab 12. Further, a fuel tank 16 for storing fuel is attached to the central portion of one side rail 6.

エンジン１４には、その後ろ側にクラッチとトランスミッションが配設されており、エンジン１４の動力はトランスミッションの出力軸に連結されたプロペラシャフトを介してディファレンシャルギヤに伝えられ、そして、このディファレンシャルギヤを介して前述した車輪１０のうちの駆動輪に更に伝達される。
一方、エンジン１４の排ガスは、排気マニホールドから排気通路１８を経由して外部に排出される。排気通路１８は、排気浄化装置２０を含んでおり、この排気浄化装置２０は排ガス中の有害成分を浄化する。 The engine 14 is provided with a clutch and a transmission on the rear side thereof, and the power of the engine 14 is transmitted to the differential gear through a propeller shaft connected to the output shaft of the transmission, and then through the differential gear. Then, it is further transmitted to the drive wheel of the wheels 10 described above.
On the other hand, the exhaust gas from the engine 14 is discharged from the exhaust manifold via the exhaust passage 18 to the outside. The exhaust passage 18 includes an exhaust purification device 20, which purifies harmful components in the exhaust gas.

排気浄化装置２０は、ＳＣＲ触媒を含む触媒装置２２と、尿素水溶液の噴射ユニット２４と、尿素水溶液の貯蔵タンク２６とを備えている。
触媒装置２２は、排気通路１８の途中に介挿された筐体と、この筐体内に配設された各種触媒とを備えている。これらの触媒として、筐体内には上流側より前段酸化触媒、ディーゼルパティキュレートフィルタ（以下、ＤＰＦという。）、ＳＣＲ触媒及び後段酸化触媒が順に配設されている。 The exhaust purification device 20 includes a catalyst device 22 including an SCR catalyst, a urea aqueous solution injection unit 24, and a urea aqueous solution storage tank 26.
The catalyst device 22 includes a casing inserted in the middle of the exhaust passage 18 and various catalysts disposed in the casing. As these catalysts, a pre-stage oxidation catalyst, a diesel particulate filter (hereinafter referred to as DPF), an SCR catalyst, and a post-stage oxidation catalyst are sequentially arranged in the casing from the upstream side.

噴射ユニット２４は、ＳＣＲ触媒に向かう排ガス中に添加剤としての尿素水溶液を噴射供給するためのものであり、前述した筐体内にて、ＳＣＲ触媒の上流側に配設された噴射ノズルと、噴射ノズルの基端に設けられた電磁弁と、所定圧の尿素水溶液を電磁弁を介して噴射ノズルに向けて供給するポンプとを備えている。噴射ユニット２４の噴射ノズルは、電磁弁が開弁されたとき、その先端の噴射孔から排ガス中に尿素水溶液を噴射する。   The injection unit 24 is for injecting and supplying a urea aqueous solution as an additive into the exhaust gas toward the SCR catalyst. In the casing described above, an injection nozzle disposed on the upstream side of the SCR catalyst, and an injection An electromagnetic valve provided at the base end of the nozzle and a pump for supplying a urea aqueous solution having a predetermined pressure toward the injection nozzle through the electromagnetic valve are provided. The injection nozzle of the injection unit 24 injects the urea aqueous solution into the exhaust gas from the injection hole at the tip when the electromagnetic valve is opened.

貯蔵タンク２６は、尿素水溶液を貯蔵しておくタンクであり、図１から明らかなように、一方のサイドレール６の燃料タンク１６の前方側に取り付けられている。この貯蔵タンク２６は、図２に示すように、ステンレス鋼製の直方体形状をなす。貯蔵タンク２６の上壁３０には、その一方の短辺近傍の補給口３４と、その中央のセンサユニット３６と、他方の短辺近傍の尿素水溶液給排管３８とがそれぞれ備えられている。   The storage tank 26 is a tank for storing an aqueous urea solution, and is attached to the front side of the fuel tank 16 of one side rail 6 as is apparent from FIG. As shown in FIG. 2, the storage tank 26 has a rectangular parallelepiped shape made of stainless steel. The upper wall 30 of the storage tank 26 is provided with a replenishing port 34 in the vicinity of one short side thereof, a sensor unit 36 in the center thereof, and a urea aqueous solution supply / discharge tube 38 in the vicinity of the other short side.

補給口３４は、尿素水溶液の補充をするための開口であり、補給口３４には脱着可能なキャップが被せられている。
センサユニット３６は、尿素水溶液の濃度を検出する濃度センサ及び尿素水溶液の温度を検出する温度センサを含み、これら濃度及び温度の情報を電子コントロールユニット（以下、ＥＣＵという。）４０に送る働きをする。ＥＣＵ４０には、その他にも図示しないセンサやデバイス類が接続されており、これらセンサからの情報を基に最適な尿素水溶液の噴射量を算出し、それに従って、尿素水溶液噴射ユニット２４に指令を送り、噴射ノズルから最適量の尿素水溶液を噴射させる。 The replenishing port 34 is an opening for replenishing the urea aqueous solution, and the replenishing port 34 is covered with a removable cap.
The sensor unit 36 includes a concentration sensor that detects the concentration of the urea aqueous solution and a temperature sensor that detects the temperature of the urea aqueous solution, and functions to send information on the concentration and temperature to an electronic control unit (hereinafter referred to as ECU) 40. . The ECU 40 is connected to other sensors and devices (not shown), and calculates the optimal urea aqueous solution injection amount based on information from these sensors, and sends a command to the urea aqueous solution injection unit 24 accordingly. The optimal amount of urea aqueous solution is sprayed from the spray nozzle.

尿素水溶液給排管３８は、貯蔵タンク２６から尿素水溶液を前述した尿素水溶液噴射ユニット２４に供給する供給配管４２と、尿素水溶液噴射ユニット２４において噴射に供されなかった尿素水溶液が戻されてくる戻り配管４４とを備えている。
また、この貯蔵タンク２６には、着脱自在の保温カバー５０が付属する。
図２は保温カバー５０を貯蔵タンク２６に装着した状態を示す。この図２から明らかなように、保温カバー５０は貯蔵タンク２６の上壁３０を除き、貯蔵タンク２６の外面を覆うカバーであり、上部に開口端５２を有する袋形状のカバー本体５４と、開口端５２を横断する形で取り付け可能な２本のストラップ５６，５６とを備えている。 The urea aqueous solution supply / discharge pipe 38 has a supply pipe 42 for supplying the urea aqueous solution from the storage tank 26 to the urea aqueous solution injection unit 24 described above, and the urea aqueous solution that has not been injected in the urea aqueous solution injection unit 24 is returned. And a pipe 44.
The storage tank 26 is provided with a detachable heat insulating cover 50.
FIG. 2 shows a state in which the heat insulating cover 50 is attached to the storage tank 26. As apparent from FIG. 2, the heat insulating cover 50 is a cover that covers the outer surface of the storage tank 26 except for the upper wall 30 of the storage tank 26, and has a bag-shaped cover main body 54 having an open end 52 at the top, and an opening. And two straps 56, 56 that can be mounted across the end 52.

カバー本体５４は、多層構造をなし、軽量で柔軟なシート材を袋形状に成形して得たものである。このシートは、防水性及び耐火性を備えた軽量素材で構成された布帛よりなる外表面層を有し、この外表面層内側に保温性を高めるための発泡体層が貼付けられている。なお、この発泡体層も軽量素材よりなる。更に、この発泡体層の内側には、耐熱性を備えた軽量素材で構成された布帛よりなる耐熱層が貼付けられている。なお、この耐熱層は更に二層構造をなしている。   The cover main body 54 has a multilayer structure and is obtained by forming a lightweight and flexible sheet material into a bag shape. This sheet has an outer surface layer made of a fabric made of a lightweight material having waterproofness and fire resistance, and a foam layer for enhancing heat retention is affixed to the inside of the outer surface layer. This foam layer is also made of a lightweight material. Further, a heat-resistant layer made of a fabric made of a lightweight material having heat resistance is attached to the inside of the foam layer. This heat-resistant layer further has a two-layer structure.

そして、上述のシートは、図２に示すように、前述した耐熱層内に収容された電熱線ヒータ５８を更に備えている。この電熱線ヒータ５８は、ヒータ制御ユニット６２に電気的に接続されており、このヒータ制御ユニット６２を介してバッテリ６４から給電を受ける。ここで、ヒータ制御ユニット６２は、ＥＣＵ４０に電気的に接続されており、このＥＣＵ４０を介して貯蔵タンク２６内の尿素水溶液の温度情報を取得するとともに、この温度情報に基づき、電熱線ヒータ５８への通電制御を行う。   And the above-mentioned sheet | seat is further provided with the heating wire heater 58 accommodated in the heat-resistant layer mentioned above, as shown in FIG. The heating wire heater 58 is electrically connected to the heater control unit 62 and receives power from the battery 64 via the heater control unit 62. Here, the heater control unit 62 is electrically connected to the ECU 40, acquires temperature information of the urea aqueous solution in the storage tank 26 via the ECU 40, and supplies the heating wire heater 58 based on the temperature information. The energization control is performed.

ストラップ５６は、帯状体であり、カバー本体５４が貯蔵タンク２６から外れないように保持するための保持部材である。このストラップ５６の一端は、カバー本体５４の開口端５２の近傍にて、カバー本体５４の長辺側となる一方の側面に固定され、その中間部は貯蔵タンク２６の上壁３０を横断して延びる十分な長さを有する。そして、ストラップ５６の他端には、掛止ボタン６０が取り付けられており、この掛止ボタン６０がカバー本体５４の他方の側面の掛止穴（図示しない）に着脱自在に装着可能となっている。なお、ストラップ５６は、図２に示すように、貯蔵タンク２６の上壁３０にて、補給口３４、センサユニット３６および尿素水溶液給排管３８を避けるように配設されている。   The strap 56 is a belt-like body, and is a holding member for holding the cover main body 54 so as not to be detached from the storage tank 26. One end of the strap 56 is fixed to one side surface which is the long side of the cover main body 54 in the vicinity of the opening end 52 of the cover main body 54, and an intermediate portion thereof crosses the upper wall 30 of the storage tank 26. It has a sufficient length to extend. A latch button 60 is attached to the other end of the strap 56, and the latch button 60 can be detachably attached to a latch hole (not shown) on the other side surface of the cover body 54. Yes. As shown in FIG. 2, the strap 56 is disposed on the upper wall 30 of the storage tank 26 so as to avoid the supply port 34, the sensor unit 36, and the urea aqueous solution supply / discharge pipe 38.

この保温カバー５０は前述したように布帛からなっているので、簡単に折り畳むことができる。それ故、保温カバー５０が使用されないとき、保温カバー５０は折り畳まれた状態で、例えば車両２のユーティリティボックス又は運転室１２内に収納され、必要に応じて貯蔵タンク２６に被せられる。
一方、車両２は、貯蔵タンク２６内の尿素水溶液の温度が尿素水溶液の凝固点付近まで低下し、凍結の虞がある場合、乗員に対し、保温カバー５０の装着を促す指示装置を備えている。 Since the heat insulating cover 50 is made of cloth as described above, it can be easily folded. Therefore, when the heat insulation cover 50 is not used, the heat insulation cover 50 is stored in the utility box or the cab 12 of the vehicle 2 in a folded state, and is put on the storage tank 26 as necessary.
On the other hand, the vehicle 2 includes an instruction device that prompts the occupant to attach the heat retaining cover 50 when the temperature of the urea aqueous solution in the storage tank 26 decreases to near the freezing point of the urea aqueous solution and there is a risk of freezing.

この指示装置は、運転室１２内に設けた指示音発生器６６と、運転室１２内のインストゥルメントパネル内に設けた指示灯６８とを備えている。指示音発生器６６及び指示灯６８は何れも、ＥＣＵ４０に電気的に接続されている（図２参照）。ＥＣＵ４０は、貯蔵タンク２６内の尿素水溶液の温度情報、即ち、その温度が予め設定した温度以下になったとき、指示灯６８及び指示音発生器６６を共に作動させる。   The instruction device includes an instruction sound generator 66 provided in the cab 12 and an indicator lamp 68 provided in an instrument panel in the cab 12. The indicator sound generator 66 and the indicator lamp 68 are both electrically connected to the ECU 40 (see FIG. 2). The ECU 40 activates both the indicator light 68 and the indicator sound generator 66 when the temperature information of the aqueous urea solution in the storage tank 26, that is, when the temperature falls below a preset temperature.

次に、保温カバー５０の使用方法について以下に説明する。
車両２のエンジンの始動時、又は、車両の運転中、貯蔵タンク２６内の尿素水溶液の温度が設定温度以下に低下しているか、又は、低下すると、前述したようにＥＣＵ４０は、運転室１２内の指示灯６８を点灯させる一方、指示音発生器６６から指示音を発生させる。これにより乗員は、尿素水溶液が凍結する虞があることを認知し、保温カバー５０を貯蔵タンク２６に装着すべく促される。 Next, the usage method of the heat insulation cover 50 is demonstrated below.
When the engine of the vehicle 2 is started or during operation of the vehicle, the temperature of the urea aqueous solution in the storage tank 26 is decreased to a set temperature or lower, or as described above, the ECU 40 is in the cab 12. The indicator sound 68 is turned on, while an instruction sound is generated from the instruction sound generator 66. As a result, the occupant recognizes that the urea aqueous solution may freeze, and is urged to attach the heat insulating cover 50 to the storage tank 26.

それ故、乗員は、車両２を停車させた後、例えばユーティリティボックス内から保温カバー５０を取り出し、保温カバー５０の開口端５２を通じ、貯蔵タンク２６の下部から貯蔵タンク２６を包み込むようにして、貯蔵タンク２６の外側に保温カバー５０を装着する。そして、貯蔵タンク２６の上壁３０にストラップ５６を掛け渡して掛止ボタン６０を留め、保温カバー５０を貯蔵タンク２６に掛止する。   Therefore, after stopping the vehicle 2, the occupant takes out the heat insulation cover 50 from the inside of the utility box, for example, and wraps the storage tank 26 from the lower part of the storage tank 26 through the open end 52 of the heat insulation cover 50. A heat insulating cover 50 is attached to the outside of the tank 26. Then, the strap 56 is hung on the upper wall 30 of the storage tank 26 to fasten the latch button 60, and the heat insulating cover 50 is latched to the storage tank 26.

更に、保温カバー５０の電熱線ヒータ５８の給電ラインをヒータ制御ユニット６２に電気的に接続する。これにより、ヒータ制御ユニット６２は電熱線ヒータ５８の通電を開始し、この電熱線ヒータ５８は貯蔵タンク２６内の尿素水溶液を加熱し、尿素水溶液の温度を所定温度範囲内に保温すべく、電熱線ヒータ５８への通電を制御する。
以上のように、本参考例においては、簡易で安価な保温カバー５０が必要なとき（尿素水溶液の温度が低下したとき）だけ、貯蔵タンク２６に装着されることにより、尿素水溶液の凍結を有効に防止することができるので、車両において高価な凍結防止用のシステムを省略することができる。
（実施例１）
次に、実施例１の保温カバー及びこの保温カバーを携行する車両について説明する。なお、実施例１を説明するにあたり、既に説明した参考例１と同一の機能を発揮する部材および部位には同一の参照符号を付して、これらの説明は省略し、相違する点のみを説明する。 Further, the power supply line of the heating wire heater 58 of the heat insulating cover 50 is electrically connected to the heater control unit 62. As a result, the heater control unit 62 starts energization of the heating wire heater 58, and the heating wire heater 58 heats the urea aqueous solution in the storage tank 26, and keeps the temperature of the urea aqueous solution within a predetermined temperature range. The energization to the hot wire heater 58 is controlled.
As described above, in this reference example, freezing of the urea aqueous solution is effective by being attached to the storage tank 26 only when the simple and inexpensive heat insulating cover 50 is required (when the temperature of the urea aqueous solution is lowered). Therefore, an expensive anti-freezing system in the vehicle can be omitted.
(Example 1 )
Next, the heat insulating cover of Example 1 and the vehicle carrying the heat insulating cover will be described. In the description of the first embodiment, the same reference numerals are given to members and parts that exhibit the same functions as those of the first reference described above, and the description thereof will be omitted, and only the differences will be described. To do.

図３は、実施例１に係る保温カバー７０を貯蔵タンク２６に装着した状態で示している。保温カバー７０は、使用しないときには全体として柔軟なシートであるが、使用時には、貯蔵タンク２６の外周に沿って折り込まれ、貯蔵タンク２６を包み込むように装着される。
ここで、説明の都合上、図３に示す貯蔵タンク２６において、貯蔵タンク２６の上壁３０の短辺に対応する両側の壁を側壁、上壁３０の長辺に対応する側の壁のうち、車両の進行方向前側（図３中矢印Ａ方向）を前壁、この前壁の反対側を後壁７２、そして、上壁３０の反対側を底壁として称す。 FIG. 3 shows the heat insulation cover 70 according to the first embodiment attached to the storage tank 26. The heat insulation cover 70 is a flexible sheet as a whole when not in use, but is folded along the outer periphery of the storage tank 26 and mounted so as to wrap the storage tank 26 when in use.
Here, for convenience of explanation, in the storage tank 26 shown in FIG. 3, the walls on both sides corresponding to the short side of the upper wall 30 of the storage tank 26 are the side walls, and the wall on the side corresponding to the long side of the upper wall 30. The front side of the vehicle in the traveling direction (the direction of arrow A in FIG. 3) is referred to as the front wall, the opposite side of the front wall is referred to as the rear wall 72, and the opposite side of the upper wall 30 is referred to as the bottom wall.

図４は、保温カバー７０を展開した状態を示しており、その外表面側を表している。
保温カバー７０は、貯蔵タンク２６の前壁に対応する前面域７４を有しており、この前面域７４には、２本のストラップ５６が所定間隔をあけて、その一端にて固定されている。また、この前面域７４の下端には、貯蔵タンク２６の底壁に対応する底面域７６が連なっている。そして、底面域７６には、前面域７４とは反対側に位置して貯蔵タンク２６の後壁７２に対応する後面域８０が連なっている。この後面域８０の外表面にはその下端部に、ストラップ５６の掛止ボタン６０が掛止される掛止穴８２，８２が配設されている。更に、後面域８０の裏面の全域には、面ファスナのフック面部材８４が貼付されている。 FIG. 4 shows a state in which the heat insulating cover 70 is expanded, and represents the outer surface side thereof.
The heat insulating cover 70 has a front area 74 corresponding to the front wall of the storage tank 26, and two straps 56 are fixed to the front area 74 at one end with a predetermined interval. . Further, a bottom area 76 corresponding to the bottom wall of the storage tank 26 is connected to the lower end of the front area 74. The bottom surface area 76 is connected to a rear surface area 80 corresponding to the rear wall 72 of the storage tank 26 located on the opposite side of the front surface area 74. On the outer surface of the rear surface area 80, hook holes 82, 82 for hooking the hook buttons 60 of the strap 56 are arranged at the lower end thereof. Further, a hook surface member 84 of a hook-and-loop fastener is attached to the entire rear surface of the rear surface area 80.

また、前面域７４の両側縁には、貯蔵タンク２６の両側壁に対応する側面域８６，９４が連なっており、これら側面域８６，９４の側縁に貯蔵タンク２６の後壁７２と対応し、前述した後面域８０と重ね合わされる後面域８８，９６がそれぞれ連なっている。そして、後面域８８，９６の表面側には、面ファスナのループ面部材９０，９８がそれぞれ貼付されている。更に、各側面域８６，９４の下端縁に必要に応じて、貯蔵タンク２６の底壁と対応し、前述した底面域７６と重ね合わされる底面域９２，１００がそれぞれ連なっている。   Further, side regions 86 and 94 corresponding to both side walls of the storage tank 26 are connected to both side edges of the front region 74, and the side edges of these side regions 86 and 94 correspond to the rear wall 72 of the storage tank 26. The rear surface areas 88 and 96 overlapped with the rear surface area 80 described above are connected. And the loop surface members 90 and 98 of a surface fastener are affixed on the surface side of the rear surface areas 88 and 96, respectively. Furthermore, bottom surface areas 92 and 100 that correspond to the bottom wall of the storage tank 26 and overlap the above-described bottom surface area 76 are connected to the lower end edges of the side surface areas 86 and 94, respectively, as necessary.

更に、保温カバー７０においても、その全域に亘りその耐熱層内に電熱線ヒータ５８が配設されている。
この保温カバー７０は、全体としてシート形状をなしているので、使用しないときには、小さく折り畳んで収納しておくことができる。
そして、保温カバー７０もまた、貯蔵タンク２６への装着が促された場合、乗員は収納場所から保温カバー７０を取り出し、貯蔵タンク２６に装着する。 Furthermore, also in the heat insulation cover 70, the heating wire heater 58 is arrange | positioned in the heat-resistant layer over the whole region.
Since the heat insulating cover 70 has a sheet shape as a whole, when it is not used, it can be folded and stored.
When the installation of the heat insulation cover 70 to the storage tank 26 is also urged, the occupant takes out the heat insulation cover 70 from the storage location and attaches it to the storage tank 26.

このとき、保温カバー７０においては、まず、貯蔵タンク２６の前壁、両側壁及び後壁といった貯蔵タンク２６の胴回りに保温カバーの前面域７４、両側面域８６，９４及び両後面域８８，９６が巻き付けられる。そして、底面域９２，１００を貯蔵タンク２６の底壁側に折り曲げ、この状態で底面域７６及び後面域８０を貯蔵タンク２６の底壁から後壁にかけて折込むとともに、面ファスナのフック面部材８４とループ面部材９０，９８とを係合させる。最後にストラップ５６を貯蔵タンク２６の上壁部分に掛け渡し、掛止ボタン６０を掛止穴８２に掛止し、保温カバー７０を貯蔵タンク２６に装着する。   At this time, in the heat insulating cover 70, first, the front region 74, both side surface regions 86 and 94, and both rear surface regions 88 and 96 of the heat insulating cover around the trunk of the storage tank 26 such as the front wall, both side walls and the rear wall of the storage tank 26. Is wound. The bottom areas 92 and 100 are bent toward the bottom wall of the storage tank 26. In this state, the bottom area 76 and the rear surface area 80 are folded from the bottom wall to the rear wall of the storage tank 26, and the hook surface member 84 of the surface fastener. And the loop surface members 90 and 98 are engaged. Finally, the strap 56 is stretched over the upper wall portion of the storage tank 26, the latch button 60 is latched in the latch hole 82, and the heat insulating cover 70 is attached to the storage tank 26.

実施例１の保温カバー７０においては、後面域８８，９６を備えていることから貯蔵タンク２６の胴回り部分に対応する箇所に余裕があるとともに、面ファスナにより係止されることから、容量が異なる貯蔵タンクであってもある程度フレキシブルに対応できる。
本発明は上述した実施例に限定されるものではなく、種々の変形が可能である。 In the heat insulating cover 70 of the first embodiment, since the rear surface areas 88 and 96 are provided, there is a margin in the portion corresponding to the waistline portion of the storage tank 26, and the capacities are locked by the surface fasteners, so that the capacities are different. Even a storage tank can be handled flexibly to some extent.
The present invention is not limited to the above-described embodiments, and various modifications can be made .

また、上記実施例では、電熱線ヒータを備えた形態について説明したが、電熱線ヒータの電源としては、車両搭載用のバッテリに限定されるものではなく、家庭用の電源でも構わない。この場合、寒冷地などで車両を長時間駐車するようなとき、本発明の保温カバーを貯蔵タンク２６に装着し、家庭用電源からの給電により加熱保温すれば、尿素水溶液の凍結を防止することができる。   Moreover, although the said Example demonstrated the form provided with the heating wire heater, as a power supply of a heating wire heater, it is not limited to the battery for vehicle mounting, A household power supply may be sufficient. In this case, when the vehicle is parked for a long time in a cold region or the like, if the heat retaining cover of the present invention is attached to the storage tank 26 and heated and kept warm by feeding from a household power source, the urea aqueous solution can be prevented from freezing. Can do.

更に、保温カバー自体の保温性が優れていれば、電熱線ヒータは省略しても構わない。この場合、保温カバーの製造コストは更に低下し、車両全体としての製造コスト削減に寄与する。
また、本発明の保温カバーにおいては、貯蔵タンク２６を車両に固定する固定ブラケット等が保温カバー装着時に邪魔となる場合は、この固定ブラケットを避けるために切欠を設ける態様をとることが好ましい。この態様によれば、保温カバーの装着がより簡単になる。 Furthermore, the heating wire heater may be omitted as long as the heat insulation of the heat insulation cover itself is excellent. In this case, the manufacturing cost of the heat insulating cover is further reduced, which contributes to the reduction of the manufacturing cost of the entire vehicle.
Moreover, in the heat insulation cover of this invention, when the fixing bracket etc. which fix the storage tank 26 to a vehicle become obstructive at the time of heat insulation cover installation, it is preferable to take the aspect which provides a notch in order to avoid this fixing bracket. According to this aspect, it is easier to attach the heat insulating cover.

参考例１に係る車両の車台構造の概略構成図である。It is a schematic block diagram of the chassis structure of the vehicle which concerns on the reference example 1. FIG. 参考例１に係る保温カバーを貯蔵タンクに装着した状態を示す斜視図である。It is a perspective view which shows the state which mounted | wore the storage tank with the heat retention cover which concerns on the reference example 1. FIG. 実施例１に係る保温カバーを貯蔵タンクに装着した状態を示す斜視図である。It is a perspective view which shows the state which mounted | wore the storage tank with the heat retention cover which concerns on Example 1. FIG. 実施例１に係る保温カバーを展開した状態を示した平面図である。It is the top view which showed the state which expand | deployed the heat retention cover which concerns on Example 1. FIG.

符号の説明Explanation of symbols

２ 車両
２６ 貯蔵タンク
５０ 保温カバー
５４ カバー本体
５６ ストラップ
５８ 電熱線ヒータ
７０ 保温カバー 2 Vehicle 26 Storage tank 50 Thermal insulation cover 54 Cover body 56 Strap 58 Heating wire heater 70 Thermal insulation cover

Claims (6)

内燃機関の排気通路に設けられ、選択還元型ＮＯｘ触媒と、直方体状をなす貯蔵タンクに貯蔵された尿素水溶液を前記選択還元型ＮＯｘ触媒の上流側の排ガス中に供給する尿素水溶液供給手段とを備えた内燃機関の排気浄化装置において、前記貯蔵タンクを覆うための保温カバーであって、
保温性を有する素材で構成されているカバー本体と、
前記カバー本体を前記貯蔵タンクに着脱自在に掛止する掛止手段と
を備え、
前記カバー本体は、前記貯蔵タンクを包み込み可能な布帛からなるシートと、前記シートに配設された面ファスナとを有し、
前記シートは、
前記貯蔵タンクの前壁の全体を覆うことが可能な前面域と、
前記前面域の一方の側縁に連なり、前記貯蔵タンクの右側壁の全体を覆うことが可能な右側面域と、
前記右側面域における前記前面域とは反対側の側縁に連なり、前記貯蔵タンクの後壁の右半分を覆うことが可能な右後面折込域と、
前記右側面域の下端縁に連なり、前記貯蔵タンクの底壁の一部を覆うことが可能な右底面折込域と、
前記前面域の他方の側縁に連なり、前記貯蔵タンクの左側壁の全体を覆うことが可能な左側面域と、
前記左側面域における前記前面域とは反対側の側縁に連なり、前記貯蔵タンクの後壁の左半分を覆うことが可能な左後面折込域と、
前記左側面域の下端縁に連なり、前記貯蔵タンクの底壁の一部を覆うことが可能な左底面折込域と、
前記前面域の下端縁に連なり、前記右底面折込域及び前記左底面折込域を介在させて前記貯蔵タンクの底壁の全体を覆うことが可能な底面域と、
前記底面域における前記前面域とは反対側の端縁に連なり、前記右後面折込域及び前記左後面折込域を介在させて前記貯蔵タンクの後壁の全体を覆うことが可能な後面域とを含み、
前記面ファスナは、前記右後面折込域及び前記左後面折込域の表面と、前記後面域の裏面とに位置付けられており、
前記カバー本体は、前記シートを前記貯蔵タンクの外周に沿って折込んで、前記貯蔵タンクの外周面を覆い、前記右後面折込域及び前記左後面折込域と前記後面域とが重なり合った部分を前記面ファスナで相互に結合して前記貯蔵タンクに装着されることを特徴とする尿素水溶液の貯蔵タンク用保温カバー。 A selective reduction type NOx catalyst provided in an exhaust passage of the internal combustion engine, and a urea aqueous solution supply means for supplying an aqueous urea solution stored in a rectangular parallelepiped storage tank into the exhaust gas upstream of the selective reduction type NOx catalyst. In the exhaust gas purification apparatus for an internal combustion engine provided, a heat insulation cover for covering the storage tank,
A cover body made of a material having heat insulation properties;
A hooking means for detachably hooking the cover body on the storage tank ;
The cover body has a sheet made of a fabric capable of wrapping the storage tank, and a hook and loop fastener disposed on the sheet,
The sheet is
A front area capable of covering the entire front wall of the storage tank;
A right side area that is connected to one side edge of the front area and can cover the entire right side wall of the storage tank;
A right rear side folding area that is connected to a side edge of the right side area opposite to the front area, and that can cover the right half of the rear wall of the storage tank;
A right bottom folding area that is connected to the lower edge of the right side area and can cover a part of the bottom wall of the storage tank;
A left side area that is connected to the other side edge of the front area and can cover the entire left side wall of the storage tank;
A left rear side folding area that is connected to a side edge of the left side area opposite to the front area, and that can cover the left half of the rear wall of the storage tank,
A left bottom folding area that is continuous with the lower edge of the left side area and can cover a part of the bottom wall of the storage tank;
A bottom area capable of covering the entire bottom wall of the storage tank through the right bottom bottom folding area and the left bottom folding area, connected to the lower edge of the front area,
A rear surface area that is connected to an edge of the bottom surface area opposite to the front surface area, and that can cover the entire rear wall of the storage tank through the right rear surface folding area and the left rear surface folding area. Including
The hook-and-loop fastener is positioned on the front surface of the right rear surface folding area and the left rear surface folding area, and on the back surface of the rear surface area,
The cover main body folds the sheet along the outer periphery of the storage tank, covers the outer peripheral surface of the storage tank, and the right rear surface folding area and the left rear surface folding area and the rear surface area overlap each other. A heat retaining cover for a storage tank of urea aqueous solution, which is attached to the storage tank by being connected to each other with a hook-and-loop fastener . 前記布帛は、防水性および耐火性を備えていることを特徴とする請求項１に記載の尿素水溶液の貯蔵タンク用保温カバー。 The fabric, insulation cover storage tank of the urea aqueous solution according to claim 1, characterized in that there Bei Ete waterproof and fire resistance. 前記カバー本体は、外表面層としての前記布帛の内側に貼り付けられた発泡体層と、前記発泡体層の内側に貼り付けられた二層の耐熱層とを更に有する多層構造をなし、前記耐熱層の層間に加熱手段を含むことを特徴とする請求項１または２に記載の尿素水溶液の貯蔵タンク用保温カバー。 The cover body, without the inside pasted foam layer of the fabric as the outer surface layer, a further having multilayer structure and a heat-resistant layer of the foam layer two layers attached to the inside of the The heat retaining cover for a storage tank of urea aqueous solution according to claim 1 or 2, further comprising heating means between the heat-resistant layers . 前記加熱手段は、電熱線であり、家庭用電源または車両搭載バッテリより給電を受けることを特徴とする請求項３に記載の尿素水溶液の貯蔵タンク用保温カバー。   The said heating means is a heating wire, and receives heat feeding from a household power supply or a vehicle-mounted battery, The thermal insulation cover for the storage tank of urea aqueous solution of Claim 3 characterized by the above-mentioned. 前記電熱線は、前記カバー本体の全域に亘り配設されていることを特徴とする請求項４に記載の尿素水溶液の貯蔵タンク用保温カバー。The said heating wire is arrange | positioned over the whole region of the said cover main body, The thermal insulation cover for storage tanks of the urea aqueous solution of Claim 4 characterized by the above-mentioned. 内燃機関の排気通路に設けられ、選択還元型ＮＯｘ触媒と、貯蔵タンクに貯蔵された尿素水溶液を前記選択還元型ＮＯｘ触媒の上流側の排ガス中に供給する尿素水溶液供給手段とを含む内燃機関の排気浄化装置を備えた車両において、
請求項１〜５の何れかに記載の保温カバーを収納する収納域と、
前記貯蔵タンク内の尿素水溶液の温度を検出する温度検出手段と、
前記温度検出手段により検出された温度が設定温度以下になった場合、乗員に対し前記保温カバーを前記貯蔵タンクに装着すべきことを指示する指示手段と
を備えていることを特徴とする車両。 An internal combustion engine comprising a selective reduction type NOx catalyst provided in an exhaust passage of the internal combustion engine and a urea aqueous solution supply means for supplying a urea aqueous solution stored in a storage tank into exhaust gas upstream of the selective reduction type NOx catalyst. In a vehicle equipped with an exhaust purification device,
A storage area for storing the heat insulation cover according to any one of claims 1 to 5 ,
Temperature detecting means for detecting the temperature of the aqueous urea solution in the storage tank;
A vehicle comprising: an instruction means for instructing an occupant to attach the heat insulation cover to the storage tank when the temperature detected by the temperature detection means falls below a set temperature.
JP2008178934A 2008-07-09 2008-07-09 A vehicle equipped with a thermal insulation cover for a storage tank of urea aqueous solution and an exhaust purification device including the storage tank Expired - Fee Related JP5054625B2 (en)

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