JP2008202434A - Reducer supply device - Google Patents

Reducer supply device Download PDF

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Publication number
JP2008202434A
JP2008202434A JP2007036859A JP2007036859A JP2008202434A JP 2008202434 A JP2008202434 A JP 2008202434A JP 2007036859 A JP2007036859 A JP 2007036859A JP 2007036859 A JP2007036859 A JP 2007036859A JP 2008202434 A JP2008202434 A JP 2008202434A
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JP
Japan
Prior art keywords
tank
reducing agent
gas phase
supply pump
supply
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
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JP2007036859A
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Japanese (ja)
Inventor
Akihiro Matsuyama
明広 松山
Kazunori Suzuki
一徳 鈴木
Hironari Nakagawa
裕也 中川
Masatoshi Maruyama
昌利 丸山
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Denso Corp
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Denso Corp
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Priority to JP2007036859A priority Critical patent/JP2008202434A/en
Priority to DE102008000272A priority patent/DE102008000272A1/en
Publication of JP2008202434A publication Critical patent/JP2008202434A/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1811—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1814—Tank level
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To prevent breakage of a supply pump 3 due to freezing of reducer by preventing the reducer from remaining and freezing in the supply pump 3 after stop of an engine in a reducer supply device 1. <P>SOLUTION: The reducer supply device 1 is provided with an air pump 21 blasting air to the first gas phase part 20, a first valve device 22 opening and closing the first gas phase part 20 to and from atmosphere, a liquid level detection sensor 25 provided at an equivalent position with a suction port 17 of the supply pump 3 and installed on the first tank 14. Consequently, first liquid level 28 can be lowered to extract reducer from the supply pump 3 by starting an air pump 21 to pressurize the first gas phase part 20 when the engine stops and supply of the reducer becomes unnecessary. Consequently, breakage of the supply pump 3 due to freezing of the reducer can be prevented by preventing the reducer from remaining and freezing in the supply pump 3 after engine stop. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、エンジンの排ガスに還元剤を供給する還元剤供給装置に関する。   The present invention relates to a reducing agent supply device that supplies a reducing agent to exhaust gas of an engine.

従来から、エンジンの排ガスに含まれる窒素酸化物（ＮＯｘ）を還元して浄化するために、排ガスに還元剤を供給する還元剤供給装置が公知である。この還元剤は、例えば、尿素水であり、尿素の分解により発生するアンモニア（ＮＨ３）が、触媒によりＮＯｘと反応して無害な窒素（Ｎ２）や水（Ｈ２Ｏ）を生成することで、ＮＯｘが浄化される。そして、還元剤は、排気管の内部に開口する噴射孔から噴射されて排ガス中に広がり、触媒まで導かれる。 2. Description of the Related Art Conventionally, a reducing agent supply device that supplies a reducing agent to exhaust gas in order to reduce and purify nitrogen oxide (NO x ) contained in engine exhaust gas is known. This reducing agent is, for example, urea water, and ammonia (NH 3 ) generated by decomposition of urea reacts with NO x by a catalyst to generate harmless nitrogen (N 2 ) and water (H 2 O). Thus, NO x is purified. And a reducing agent is injected from the injection hole opened inside an exhaust pipe, spreads in exhaust gas, and is guide | induced to a catalyst.

ところで、還元剤供給装置は、還元剤をタンクに貯留し、タンク内の還元剤を供給ポンプにより吸引して排ガスの方に供給する（例えば、特許文献１参照）。このため、エンジン停止後に還元剤の供給が不要になると、供給ポンプの内部に残留した還元剤が凍結する虞がある。そして、供給ポンプの内部で還元剤の凍結が生じると、供給ポンプが破損して次回のエンジン運転時に還元剤を供給できなくなる虞がある。
特表２００４−５１００９３号公報 Incidentally, the reducing agent supply device stores the reducing agent in a tank, sucks the reducing agent in the tank with a supply pump, and supplies it to the exhaust gas (for example, refer to Patent Document 1). For this reason, if the supply of the reducing agent becomes unnecessary after the engine is stopped, the reducing agent remaining inside the supply pump may freeze. If the reducing agent freezes inside the supply pump, the supply pump may be damaged and the reducing agent may not be supplied during the next engine operation.
Japanese translation of PCT publication No. 2004-510093

本発明は、上記の問題点を解決するためになされたものであり、その目的は、還元剤供給装置において、エンジン停止後に供給ポンプの内部に還元剤が残留して凍結するのを阻止し、還元剤の凍結による供給ポンプの破損を防止することにある。   The present invention has been made to solve the above-described problems, and its purpose is to prevent the reducing agent from remaining in the supply pump after the engine is stopped and freezing in the reducing agent supply device. It is to prevent the supply pump from being damaged by freezing of the reducing agent.

〔請求項１の手段〕
請求項１に記載の還元剤供給装置は、エンジンの排ガスに還元剤を供給するものであり、液状の還元剤を貯留して液相部を形成するタンクから還元剤を吸引し排ガスの方に供給する供給ポンプと、タンクの内部で液相部の上部領域を占める気相部の圧力を操作することで、供給ポンプの内部からタンクに還元剤を抜き出す抜出手段と、タンクの気相部の圧力を操作することで、タンクから供給ポンプの内部に還元剤を充填する充填手段と、エンジンの運転状態に応じて抜出手段および充填手段を制御する制御手段とを備える。 [Means of Claim 1]
The reducing agent supply apparatus according to claim 1 supplies the reducing agent to the exhaust gas of the engine, and sucks the reducing agent from a tank that stores the liquid reducing agent and forms a liquid phase portion, and moves it toward the exhaust gas. A supply pump to be supplied, a means for extracting a reducing agent from the inside of the supply pump to the tank by operating the pressure of the gas phase portion that occupies the upper region of the liquid phase portion inside the tank, and a gas phase portion of the tank Is provided with a filling means for filling the inside of the supply pump with a reducing agent from the tank, and a control means for controlling the extraction means and the filling means in accordance with the operating state of the engine.

これにより、エンジンが停止して還元剤の供給が不要になった場合、抜出手段により供給ポンプから還元剤を抜き出すことができる。このため、エンジン停止後に供給ポンプの内部に還元剤が残留して凍結するのを阻止し、還元剤の凍結による供給ポンプの破損を防止することができる。また、エンジンが始動して還元剤の供給が必要になった場合、充填手段により供給ポンプに還元剤を充填することができる。このため、供給ポンプの内部を空にしても、直ちに供給ポンプに還元剤を充填し、排ガスの方に還元剤を供給することができる。   Thereby, when the engine is stopped and the supply of the reducing agent becomes unnecessary, the reducing agent can be extracted from the supply pump by the extraction means. For this reason, it is possible to prevent the reducing agent from remaining in the supply pump after the engine is stopped and freeze, and to prevent the supply pump from being damaged by the freezing of the reducing agent. In addition, when the engine is started and it is necessary to supply the reducing agent, the supply pump can be filled with the reducing agent by the filling means. For this reason, even if the inside of the supply pump is emptied, it is possible to immediately fill the supply pump with the reducing agent and supply the reducing agent to the exhaust gas.

〔請求項２の手段〕
請求項２に記載の還元剤供給装置によれば、タンクは、供給ポンプを内部に収容して供給ポンプにより還元剤を吸引される第１タンクと、第１タンクの液相部と連通する液相部を形成する第２タンクとに区画される。また、抜出手段は、第１タンクの気相部を加圧することで第１タンクから第２タンクに還元剤を流入させる第１気相部加圧手段であり、充填手段は、第１タンクの気相部を減圧することで第２タンクから第１タンクに還元剤を流入させる第１気相部減圧手段である。 [Means of claim 2]
According to the reducing agent supply device according to claim 2, the tank contains a supply pump therein and a liquid communicating with the liquid phase portion of the first tank, the first tank being sucked by the supply pump and the reducing agent. It is divided into the 2nd tank which forms a phase part. The extracting means is a first gas phase pressurizing means for injecting the reducing agent from the first tank into the second tank by pressurizing the gas phase of the first tank, and the filling means is the first tank. The first gas phase depressurizing means causes the reducing agent to flow from the second tank to the first tank by depressurizing the gas phase portion.

これにより、第１タンクの気相部（第１気相部とする）を加圧して第１タンクの還元剤の液面（第１液面とする）を下げることで、供給ポンプから還元剤を抜き出すことができる。また、第１気相部を減圧して第１液面を上げることで、供給ポンプに還元剤を充填することができる。このように、第１気相部の圧力を操作して第１液面を上下させることで、供給ポンプに対する還元剤の抜き出しおよび充填を容易に行うことができる。   Thus, the reducing agent from the supply pump is lowered by pressurizing the gas phase part (referred to as the first gas phase part) of the first tank and lowering the liquid level (referred to as the first liquid level) of the reducing agent in the first tank. Can be extracted. Moreover, the supply pump can be filled with a reducing agent by depressurizing the first gas phase and raising the first liquid level. In this manner, by operating the pressure in the first gas phase part to raise and lower the first liquid level, it is possible to easily extract and fill the reducing agent with respect to the supply pump.

なお、第１気相部の圧力操作は、例えば、第１気相部に空気を送り込むエアポンプを第１気相部加圧手段とし、第１気相部を大気に対して開閉する弁装置を第１気相部減圧手段として用いることにより容易に行うことができる。   In addition, the pressure operation of the first gas phase portion is, for example, a valve device that opens and closes the first gas phase portion with respect to the atmosphere using an air pump that sends air to the first gas phase portion as the first gas phase portion pressurizing means. It can be easily carried out by using it as the first gas phase part decompression means.

〔請求項３の手段〕
請求項３に記載の還元剤供給装置によれば、タンクは、供給ポンプを内部に収容して供給ポンプにより還元剤を吸引される第１タンクと、第１タンクの液相部と連通する液相部を形成する第２タンクとに区画される。また、抜出手段は、第２タンクの気相部を減圧することで第１タンクから第２タンクに還元剤を流入させる第２気相部減圧手段であり、充填手段は、第２タンクの気相部を加圧することで第２タンクから第１タンクに還元剤を流入させる第２気相部加圧手段である。 [Means of claim 3]
According to the reducing agent supply apparatus according to claim 3, the tank includes a first tank in which a supply pump is housed and the reducing agent is sucked by the supply pump, and a liquid that communicates with a liquid phase portion of the first tank. It is divided into the 2nd tank which forms a phase part. The extracting means is a second gas phase part pressure reducing means for reducing the gas phase part of the second tank to flow the reducing agent into the second tank from the first tank, and the filling means is the second tank. It is a second gas phase part pressurizing unit that causes the reducing agent to flow from the second tank to the first tank by pressurizing the gas phase part.

これにより、第２タンクの気相部（第２気相部とする）を減圧して第２タンクの還元剤の液面（第２液面とする）を上げるとともに第１液面を下げることで、供給ポンプから還元剤を抜き出すことができる。また、第２気相部を加圧して第２液面を下げるとともに第１液面を上げることで、供給ポンプに還元剤を充填することができる。このように、第２気相部の圧力を操作して第１液面を上下させることで、供給ポンプに対する還元剤の抜き出しおよび充填を容易に行うことができる。   As a result, the gas phase part (referred to as the second gas phase part) of the second tank is depressurized to raise the liquid level (referred to as the second liquid level) of the reducing agent in the second tank and lower the first liquid level. Thus, the reducing agent can be extracted from the supply pump. Further, the supply pump can be filled with the reducing agent by pressurizing the second gas phase part to lower the second liquid level and raise the first liquid level. As described above, by operating the pressure of the second gas phase part to raise and lower the first liquid level, it is possible to easily extract and fill the reducing agent with respect to the supply pump.

なお、第２気相部の圧力操作は、例えば、第２気相部に空気を送り込むエアポンプを第２気相部加圧手段とし、第２気相部を大気に対して開閉する弁装置を第２気相部減圧手段として用いることにより容易に行うことができる。   In addition, the pressure operation of the second gas phase portion is, for example, a valve device that opens and closes the second gas phase portion with respect to the atmosphere by using an air pump that sends air to the second gas phase portion as the second gas phase portion pressurizing means. It can be easily performed by using it as the second gas phase part decompression means.

〔請求項４の手段〕
請求項４に記載の還元剤供給装置によれば、供給ポンプはタンクの外部に配される外部供給ポンプであり、外部供給ポンプの吸引口にはタンクの液相部に通じる供給流路が接続している。また、抜出手段は、タンクの気相部を減圧することで、供給流路を介して供給ポンプの内部から還元剤を抜き出し、充填手段は、タンクの気相部を加圧することで、供給流路を介して供給ポンプの内部に還元剤を充填する。 [Means of claim 4]
According to the reducing agent supply apparatus according to claim 4, the supply pump is an external supply pump disposed outside the tank, and a supply flow path leading to the liquid phase portion of the tank is connected to the suction port of the external supply pump. is doing. Further, the extracting means depressurizes the gas phase part of the tank to extract the reducing agent from the inside of the supply pump through the supply channel, and the filling means supplies the gas phase part of the tank by pressurizing. A reducing agent is filled into the supply pump through the flow path.

これにより、タンクの気相部を減圧してタンクの還元剤の液面を上げることで、外部供給ポンプから還元剤を抜き出すことができる。また、気相部を加圧して液面を下げることで、外部供給ポンプに還元剤を充填することができる。このように、気相部の圧力を操作して液面を上下させることで、供給ポンプに対する還元剤の抜き出しおよび充填を容易に行うことができる。   Thereby, the reducing agent can be extracted from the external supply pump by depressurizing the gas phase portion of the tank and raising the level of the reducing agent in the tank. Further, the external supply pump can be filled with a reducing agent by pressurizing the gas phase portion to lower the liquid level. In this manner, by operating the pressure in the gas phase part to raise and lower the liquid level, the reducing agent can be easily extracted and filled in the supply pump.

なお、気相部の圧力操作は、例えば、気相部に空気を送り込むエアポンプを充填手段とし、気相部を大気に対して開閉する弁装置を抜出手段として用いることにより容易に行うことができる。   The pressure operation in the gas phase part can be easily performed by using, for example, an air pump for sending air to the gas phase part as a filling means and a valve device for opening and closing the gas phase part with respect to the atmosphere as an extraction means. it can.

〔請求項５の手段〕
請求項５に記載の還元剤供給装置によれば、抜出手段および充填手段は、タンクの気相部へ空気を吐出する機能とタンクの気相部から空気を吸引する機能とを切り替えることができる１機のエアポンプである。
これにより、供給ポンプに対する還元剤の抜き出しおよび充填を、１つの機器により行うことができる。 [Means of claim 5]
According to the reducing agent supply apparatus of the fifth aspect, the extraction means and the filling means can switch between a function of discharging air to the gas phase part of the tank and a function of sucking air from the gas phase part of the tank. One air pump that can be used.
Thereby, extraction | drawer and filling of the reducing agent with respect to a supply pump can be performed with one apparatus.

〔請求項６の手段〕
請求項６に記載の還元剤供給装置によれば、抜出手段および充填手段は、加圧源および減圧源とタンクの気相部との連通状態を切り替える１または複数の切替弁である。
これにより、抜出手段および充填手段を弁装置のみで構成することができる。なお、車両には、加圧源として利用できるエアコンプレッサや、減圧源として利用できるエンジンへの吸気管が具備されているので、上記のような構成を容易に組むことができる。 [Means of claim 6]
According to the reducing agent supply apparatus of the sixth aspect, the extraction means and the filling means are one or a plurality of switching valves for switching the communication state between the pressurization source and the decompression source and the gas phase portion of the tank.
Thereby, an extraction means and a filling means can be comprised only with a valve apparatus. Since the vehicle is provided with an air compressor that can be used as a pressurizing source and an intake pipe to an engine that can be used as a depressurizing source, the above configuration can be easily assembled.

〔請求項７の手段〕
請求項７に記載の還元剤供給装置は、供給ポンプの内部における還元剤の充填状態を検出する検出手段を備える。
これにより、供給ポンプの内部における還元剤の充填状態を監視することができるので、抜出手段や充填手段を効果的に制御することができる。 [Means of Claim 7]
According to a seventh aspect of the present invention, there is provided a reducing agent supply device comprising a detecting means for detecting a state of filling of the reducing agent inside the supply pump.
Thereby, since the filling state of the reducing agent inside the supply pump can be monitored, the extraction means and the filling means can be effectively controlled.

〔請求項８の手段〕
請求項８に記載の還元剤供給装置によれば、検出手段は、第１タンクにおける還元剤の液面が供給ポンプよりも低位にあることを検知する低位検知手段である。
これにより、供給ポンプからの還元剤の抜き出しが終了したことを確実に検知することができる。 [Means of Claim 8]
According to the reducing agent supply apparatus of the eighth aspect, the detecting means is a low level detecting means for detecting that the liquid level of the reducing agent in the first tank is lower than the supply pump.
Thereby, it can be reliably detected that the extraction of the reducing agent from the supply pump has been completed.

〔請求項９の手段〕
請求項９に記載の還元剤供給装置によれば、検出手段は、第１タンクにおける還元剤の液面が供給ポンプよりも高位にあることを検知する高位検知手段である。
これにより、供給ポンプへの還元剤の充填が終了したことを確実に検知することができる。 [Means of Claim 9]
According to the reducing agent supply apparatus of the ninth aspect, the detecting means is a high level detecting means for detecting that the liquid level of the reducing agent in the first tank is higher than the supply pump.
As a result, it is possible to reliably detect that the supply pump has been filled with the reducing agent.

最良の形態１の還元剤供給装置は、エンジンの排ガスに還元剤を供給するものであり、液状の還元剤を貯留して液相部を形成するタンクから還元剤を吸引し排ガスの方に供給する供給ポンプと、タンクの内部で液相部の上部領域を占める気相部の圧力を操作することで、供給ポンプの内部からタンクに還元剤を抜き出す抜出手段と、タンクの気相部の圧力を操作することで、タンクから供給ポンプの内部に還元剤を充填する充填手段と、エンジンの運転状態に応じて抜出手段および充填手段を制御する制御手段とを備える。   The reductant supply device of the best mode 1 supplies the reductant to the exhaust gas of the engine, sucks the reductant from a tank that stores the liquid reductant and forms a liquid phase portion, and supplies it to the exhaust gas. The supply pump, the pressure of the gas phase part occupying the upper region of the liquid phase part inside the tank, the extraction means for extracting the reducing agent from the inside of the supply pump to the tank, and the gas phase part of the tank By operating the pressure, it is provided with a filling means for filling the inside of the supply pump from the tank with a reducing agent, and a control means for controlling the extraction means and the filling means according to the operating state of the engine.

そして、この還元剤供給装置によれば、タンクは、供給ポンプを内部に収容して供給ポンプにより還元剤を吸引される第１タンクと、第１タンクの液相部と連通する液相部を形成する第２タンクとに区画される。また、抜出手段は、第１タンクの気相部を加圧することで第１タンクから第２タンクに還元剤を流入させる第１気相部加圧手段であり、充填手段は、第１タンクの気相部を減圧することで第２タンクから第１タンクに還元剤を流入させる第１気相部減圧手段である。   According to the reducing agent supply apparatus, the tank includes a first tank that houses a supply pump and sucks the reducing agent by the supply pump, and a liquid phase portion that communicates with the liquid phase portion of the first tank. It is divided into the 2nd tank to form. The extracting means is a first gas phase pressurizing means for injecting the reducing agent from the first tank into the second tank by pressurizing the gas phase of the first tank, and the filling means is the first tank. The first gas phase depressurizing means causes the reducing agent to flow from the second tank to the first tank by depressurizing the gas phase portion.

また、この還元剤供給装置は、供給ポンプの内部における還元剤の充填状態を検出する検出手段を備え、この検出手段は、第１タンクにおける還元剤の液面が供給ポンプよりも低位にあることを検知する低位検知手段である。   In addition, the reducing agent supply device includes a detecting unit that detects a filling state of the reducing agent in the supply pump, and the detecting unit has a level of the reducing agent in the first tank lower than that of the supply pump. Is a low-level detection means for detecting

最良の形態２の還元剤供給装置によれば、抜出手段は、第２タンクの気相部を減圧することで第１タンクから第２タンクに還元剤を流入させる第２気相部減圧手段であり、充填手段は、第２タンクの気相部を加圧することで第２タンクから第１タンクに還元剤を流入させる第２気相部加圧手段である。   According to the reducing agent supply apparatus of the best mode 2, the extraction means is a second gas phase part pressure reducing means for reducing the gas phase part of the second tank to flow the reducing agent from the first tank to the second tank. The filling unit is a second gas phase part pressurizing unit that pressurizes the gas phase part of the second tank to flow the reducing agent from the second tank to the first tank.

〔実施例１の構成〕
実施例１の還元剤供給装置１の構成を、図１を用いて説明する。
還元剤供給装置１は、エンジン（図示せず）の排ガスに還元剤を供給するものであり、排ガスに含まれる窒素酸化物（ＮＯｘ）を還元して浄化するために用いられる。還元剤は、例えば、尿素水であり、尿素の分解により発生するアンモニア（ＮＨ３）が、触媒（図示せず）によりＮＯｘと反応して無害な窒素（Ｎ２）や水（Ｈ２Ｏ）を生成することで、ＮＯｘが浄化される。 [Configuration of Example 1]
The structure of the reducing agent supply apparatus 1 of Example 1 is demonstrated using FIG.
The reducing agent supply device 1 supplies a reducing agent to exhaust gas from an engine (not shown), and is used to reduce and purify nitrogen oxides (NO x ) contained in the exhaust gas. The reducing agent is, for example, urea water. Ammonia (NH 3 ) generated by the decomposition of urea reacts with NO x by a catalyst (not shown) to cause harmless nitrogen (N 2 ) or water (H 2 O). ) to produce a, NO x is purified.

還元剤供給装置１は、例えば、還元剤を貯留するタンク２から還元剤を吸引して吐出する供給ポンプ３と、供給ポンプ３から吐出された還元剤を排気管４の内部に噴射する添加弁５と、供給ポンプ３の吐出圧を所定値以下に規制する吐出圧調整弁６と、供給ポンプ３から添加弁５に向かう還元剤の温度を検出する温度センサ７と、供給ポンプ３から添加弁５に向かう還元剤の圧力を検出する圧力センサ８と、供給ポンプ３から添加弁５に向かう還元剤の異物を除去するフィルタ９と、温度センサ７や圧力センサ８からの出力に応じて供給ポンプ３や添加弁５の作動を制御する電子制御装置（以下、ＥＣＵ１０とする）とを備える。   The reducing agent supply device 1 includes, for example, a supply pump 3 that sucks and discharges the reducing agent from a tank 2 that stores the reducing agent, and an addition valve that injects the reducing agent discharged from the supply pump 3 into the exhaust pipe 4. 5, a discharge pressure adjusting valve 6 that regulates the discharge pressure of the supply pump 3 to a predetermined value or less, a temperature sensor 7 that detects the temperature of the reducing agent from the supply pump 3 toward the addition valve 5, and an addition valve from the supply pump 3 A pressure sensor 8 for detecting the pressure of the reducing agent directed to 5, a filter 9 for removing foreign substances of the reducing agent directed to the addition valve 5 from the supply pump 3, and a supply pump in accordance with outputs from the temperature sensor 7 and the pressure sensor 8. 3 and an electronic control device (hereinafter referred to as ECU 10) for controlling the operation of the addition valve 5.

供給ポンプ３は、例えば、永久磁石が装着されたロータ（図示せず）と、コイルが巻線されたステータ（図示せず）とを有し、永久磁石による磁界とコイルに通電される電流との相互作用によりトルクを発生するブラシレスモータ（図示せず）をアクチュエータとする。   The supply pump 3 includes, for example, a rotor (not shown) on which a permanent magnet is mounted and a stator (not shown) around which a coil is wound, and a magnetic field generated by the permanent magnet and a current supplied to the coil. A brushless motor (not shown) that generates torque by the interaction is used as an actuator.

添加弁５は、排ガスが通る排気管４に装着され、噴射孔を含む先端部は、排気管４の内部に突出する。そして、還元剤は、供給ポンプ３から添加弁５まで導かれ、直接、排気管４の内部に噴射される。また、噴射された還元剤は、排ガスと混合した後に触媒に導かれ、上記のようにＮＯｘを浄化する。なお、添加弁５は、通電により弁体（図示せず）を開弁側に磁気吸引するソレノイドコイル（図示せず）を有する。そして、ＥＣＵ１０は、ソレノイドコイルへの通電を制御することで、添加弁５による還元剤の噴射量や噴射時期等を制御する。 The addition valve 5 is attached to the exhaust pipe 4 through which the exhaust gas passes, and the tip including the injection hole projects into the exhaust pipe 4. Then, the reducing agent is guided from the supply pump 3 to the addition valve 5 and directly injected into the exhaust pipe 4. Further, the injected reducing agent is introduced into the catalyst after mixing with the exhaust gas, purifying NO x as described above. The addition valve 5 has a solenoid coil (not shown) that magnetically attracts a valve element (not shown) to the valve opening side when energized. And ECU10 controls the injection quantity of the reducing agent by injection valve 5, injection timing, etc. by controlling electricity supply to a solenoid coil.

ＥＣＵ１０は、制御機能および演算機能を発揮するＣＰＵ、ＲＯＭおよびＲＡＭ等の記憶装置、入力装置ならびに出力装置等により構成される周知のマイクロコンピュータであり、エンジンの運転状態に応じて、各種機器のアクチュエータに指令して機器の駆動制御を行うものである。すなわち、ＥＣＵ１０は、温度センサ７や圧力センサ８等の各種センサからの入力に応じて、供給ポンプ３や添加弁５等の作動を制御する。   The ECU 10 is a well-known microcomputer including a CPU, a ROM, a RAM, and other storage devices, an input device, an output device, and the like that perform a control function and a calculation function. To control the drive of the device. That is, the ECU 10 controls the operation of the supply pump 3 and the addition valve 5 according to inputs from various sensors such as the temperature sensor 7 and the pressure sensor 8.

〔実施例１の特徴〕
実施例１の還元剤供給装置１の特徴を、図１を用いて説明する。
実施例１の還元剤供給装置１によれば、タンク２は、還元剤により形成される液相部が互いに連通する２つのタンク（以下、第１、第２タンク１４、１５とする）に区画され、供給ポンプ３は、吐出口１６が吸引口１７よりも上方となるように配されて第１タンク１４の内部に収容されている。 [Features of Example 1]
The characteristics of the reducing agent supply apparatus 1 according to the first embodiment will be described with reference to FIG.
According to the reducing agent supply apparatus 1 of the first embodiment, the tank 2 is divided into two tanks (hereinafter referred to as first and second tanks 14 and 15) in which liquid phase portions formed by the reducing agent communicate with each other. The supply pump 3 is accommodated in the first tank 14 so that the discharge port 16 is located above the suction port 17.

また、還元剤供給装置１は、第１タンク１４の気相部（以下、第１気相部２０とする）に空気を送り込むエアポンプ２１と、第１気相部２０を大気に対して開閉する第１弁装置２２と、第２タンク１５の気相部（以下、第２気相部２３とする）を大気に対して開閉する第２弁装置２４と、供給ポンプ３の吸引口１７と同位に配されて第１タンク１４に装着される液面検知センサ２５とを備える。
なお、第１、第２気相部２０、２３は、各々、第１、第２タンク１４、１５の液相部の上部領域を占めるように形成されて区画され、互いに非連通である。 The reducing agent supply apparatus 1 also opens and closes the air pump 21 for sending air to the gas phase section (hereinafter referred to as the first gas phase section 20) of the first tank 14 and the first gas phase section 20 with respect to the atmosphere. The first valve device 22, the second valve device 24 that opens and closes the gas phase portion of the second tank 15 (hereinafter referred to as the second gas phase portion 23) with respect to the atmosphere, and the suction port 17 of the supply pump 3 are the same. And a liquid level detection sensor 25 mounted on the first tank 14.
The first and second gas phase portions 20 and 23 are formed and partitioned so as to occupy upper regions of the liquid phase portions of the first and second tanks 14 and 15, respectively, and are not in communication with each other.

そして、ＥＣＵ１０は、液面検知センサ２５からの入力、およびエンジンの運転状態を示す各種センサからの入力、自身のエンジン停止または始動の判断等に応じて、エアポンプ２１、第１、第２弁装置２２、２４を制御する制御手段として機能する。   Then, the ECU 10 determines whether the air pump 21, the first and second valve devices are in accordance with input from the liquid level detection sensor 25, input from various sensors indicating the operating state of the engine, determination of whether the engine is stopped or started, and the like. It functions as a control means for controlling 22 and 24.

エアポンプ２１は、外気を吸引加圧して第１気相部２０に向けて吐出するものであり、第１気相部２０を加圧するときに作動するように制御される。そして、エアポンプ２１は、第１気相部２０に空気を送り込み第１気相部２０を加圧することで第１タンク１４から第２タンク１５に還元剤を流入させる第１気相部加圧手段として機能する。さらに、エアポンプ２１は、第１気相部２０を加圧して第１タンク１４の還元剤の液面（以下、第１液面２８とする）を低下させることで、供給ポンプ３の内部から還元剤を抜き出す抜出手段として機能する。   The air pump 21 sucks and pressurizes outside air and discharges it toward the first gas phase unit 20, and is controlled so as to operate when the first gas phase unit 20 is pressurized. Then, the air pump 21 is a first vapor phase pressurizing unit that sends the reducing agent into the second tank 15 from the first tank 14 by sending air into the first vapor phase portion 20 and pressurizing the first vapor phase portion 20. Function as. Further, the air pump 21 reduces the liquid level of the reducing agent in the first tank 14 (hereinafter referred to as the first liquid level 28) by pressurizing the first gas phase unit 20, thereby reducing from the inside of the supply pump 3. It functions as an extraction means for extracting the agent.

第１弁装置２２は、第１気相部２０を加圧するときに閉弁するように制御され、第１気相部２０を大気に対して閉鎖する。また、第１弁装置２２は、加圧された第１気相部２０を減圧するときに開弁するように制御され、第１気相部２０を大気に対して開放する。そして、第１弁装置２２は、加圧された第１気相部２０から空気を排出し第１気相部２０を減圧することで第２タンク１５から第１タンク１４に還元剤を流入させる第１気相部減圧手段として機能する。さらに、第１弁装置２２は、加圧された第１気相部２０を減圧して第１液面２８を上昇させることで、供給ポンプ３の内部に還元剤を充填する充填手段として機能する。   The first valve device 22 is controlled to close when the first gas phase unit 20 is pressurized, and closes the first gas phase unit 20 with respect to the atmosphere. The first valve device 22 is controlled to open when the pressurized first gas phase portion 20 is depressurized, and opens the first gas phase portion 20 to the atmosphere. Then, the first valve device 22 discharges air from the pressurized first gas phase unit 20 and depressurizes the first gas phase unit 20, thereby causing the reducing agent to flow into the first tank 14 from the second tank 15. It functions as a first vapor phase decompression unit. Further, the first valve device 22 functions as a filling unit that fills the inside of the supply pump 3 with a reducing agent by depressurizing the pressurized first gas phase portion 20 to raise the first liquid level 28. .

第２弁装置２４は、第１気相部２０を加圧するときおよび減圧するときの両方において開弁するように制御される。
まず、第２弁装置２４は、第１気相部２０を加圧して供給ポンプ３の内部から還元剤を抜き出すときに開弁する。これにより、第２弁装置２４は、第１液面２８の低下（つまり、第２タンク１５の還元剤の液面（以下、第２液面３０とする）の上昇）により加圧される第２気相部２３を大気に対して開放し第２気相部２３から空気を排出することで、供給ポンプ３からの還元剤の抜き出しをアシストする。 The second valve device 24 is controlled so as to open both when the first gas phase unit 20 is pressurized and when the pressure is reduced.
First, the second valve device 24 is opened when the first gas phase section 20 is pressurized and the reducing agent is extracted from the supply pump 3. Thereby, the second valve device 24 is pressurized by the decrease in the first liquid level 28 (that is, the increase in the liquid level of the reducing agent (hereinafter referred to as the second liquid level 30) in the second tank 15). The gas phase section 23 is opened to the atmosphere and air is discharged from the second gas phase section 23 to assist the extraction of the reducing agent from the supply pump 3.

また、第２弁装置２４は、第１気相部２０を減圧して供給ポンプ３の内部に還元剤を充填するときにも開弁する。これにより、第２弁装置２４は、第１液面２８の上昇（つまり、第２液面３０の低下）により減圧される第２気相部２３を大気に対して開放し第２気相部２３に外気を導くことで、供給ポンプ３への還元剤の充填をアシストする。   The second valve device 24 is also opened when the pressure of the first gas phase portion 20 is reduced and the reducing agent is filled in the supply pump 3. As a result, the second valve device 24 opens the second gas phase part 23 that is depressurized by the rise of the first liquid level 28 (that is, the decrease of the second liquid level 30) to the atmosphere, and the second gas phase part. By guiding the outside air to 23, the supply pump 3 is assisted in filling with the reducing agent.

液面検知センサ２５は、液（還元剤）に浸っているときと浸っていないときとで異なる電気信号を出力するものである。これにより、液面検知センサ２５は、吸引口１７と同位に配されて第１タンク１４に装着されることで、第１液面２８が供給ポンプ３よりも低位にあることを検知する低位検知手段として機能する。さらに、液面検知センサ２５は、低位検知手段として機能することで、供給ポンプ３の内部における還元剤の充填状態を検出する検出手段として機能する。   The liquid level detection sensor 25 outputs different electrical signals depending on whether it is immersed in the liquid (reducing agent) or not. Thereby, the liquid level detection sensor 25 is arranged at the same position as the suction port 17 and is attached to the first tank 14, thereby detecting that the first liquid level 28 is lower than the supply pump 3. Functions as a means. Further, the liquid level detection sensor 25 functions as a low-level detection unit, and thus functions as a detection unit that detects the state of filling of the reducing agent inside the supply pump 3.

〔実施例１の制御方法〕
実施例１の還元剤供給装置１による制御方法を、図３のフローチャートを用いて説明する。
まず、ステップＳ１でエンジンが始動したか否かを判断し、エンジンが始動していれば（ＹＥＳ）、ステップＳ２に進み、エンジンが始動していなければ（ＮＯ）、エンジンが始動するまで待機する。ステップＳ２では、第１、第２弁装置２２、２４を両方とも開弁して第１、第２気相部２０、２３を両方とも大気に開放する。これにより、第１液面２８が、図２に示すレベルから上昇を開始する。 [Control Method of Example 1]
The control method by the reducing agent supply apparatus 1 of Example 1 is demonstrated using the flowchart of FIG.
First, it is determined in step S1 whether or not the engine has been started. If the engine has been started (YES), the process proceeds to step S2, and if the engine has not been started (NO), the process waits until the engine is started. . In step S2, both the first and second valve devices 22, 24 are opened to open both the first and second gas phase units 20, 23 to the atmosphere. Thereby, the 1st liquid level 28 starts a raise from the level shown in FIG.

次に、ステップＳ３で第１液面２８が液面検知センサ２５により検知されたか否かを判断し、第１液面２８が検知されていれば（ＹＥＳ）、ステップＳ４に進み、第１液面２８が検知されていなければ（ＮＯ）、検知されるまで待機する。ステップＳ４では、供給ポンプ３を起動して供給ポンプ３から添加弁５への還元剤の供給を開始する。すなわち、ステップＳ３、Ｓ４では、供給ポンプ３の内部に還元剤の充填が始まったか否かを判断し、充填が始まっていれば供給ポンプ３を起動して添加弁５への供給を開始する。   Next, in step S3, it is determined whether or not the first liquid level 28 is detected by the liquid level detection sensor 25. If the first liquid level 28 is detected (YES), the process proceeds to step S4 and the first liquid level is detected. If the surface 28 is not detected (NO), it waits until it is detected. In step S <b> 4, the supply pump 3 is activated to start supplying the reducing agent from the supply pump 3 to the addition valve 5. That is, in Steps S3 and S4, it is determined whether or not charging of the reducing agent has started in the supply pump 3, and if charging has started, the supply pump 3 is activated and supply to the addition valve 5 is started.

そして、ステップＳ５でエンジンが停止したか否かを判断し、エンジンが停止していれば（ＹＥＳ）、ステップＳ６に進み、エンジンが停止していなければ（ＮＯ）、エンジンが停止するまで待機する。なお、エンジン運転中の供給ポンプ３のオンオフや第１、第２弁装置２２、２４の開閉は別の制御フローに基づいて制御される。
ステップＳ６では、供給ポンプ３を停止して供給ポンプ３から添加弁５への還元剤の供給を停止する。 In step S5, it is determined whether or not the engine has stopped. If the engine has stopped (YES), the process proceeds to step S6. If the engine has not stopped (NO), the process waits until the engine stops. . The on / off of the supply pump 3 during engine operation and the opening and closing of the first and second valve devices 22 and 24 are controlled based on another control flow.
In step S6, the supply pump 3 is stopped and the supply of the reducing agent from the supply pump 3 to the addition valve 5 is stopped.

次に、ステップＳ７で第１弁装置２２を閉弁して第１気相部２０を大気に対して閉鎖し、第２弁装置２４を開弁して第２気相部２３を大気に開放し、ステップＳ８でエアポンプ２１を起動する。これにより、第１液面２８が、図１に示すレベルから低下を開始する。   Next, in step S7, the first valve device 22 is closed to close the first gas phase portion 20 with respect to the atmosphere, and the second valve device 24 is opened to open the second gas phase portion 23 to the atmosphere. In step S8, the air pump 21 is activated. Thereby, the 1st liquid level 28 starts a fall from the level shown in FIG.

次に、ステップＳ９で第１液面２８が液面検知センサ２５により検知されなくなったか否かを判断し、第１液面２８が検知されなくなっていれば（ＹＥＳ）、ステップＳ１０に進み、第１液面２８が検知されていれば（ＮＯ）、検知されなくなるまで待機する。ステップＳ１０では、エアポンプ２１を停止し、続いてステップＳ１１で第２弁装置２４を閉弁して第２気相部２３を大気に対して閉鎖する。すなわち、ステップＳ９〜Ｓ１１では、供給ポンプ３の内部から還元剤の抜き出しが終わったか否かを判断し、抜き出しが終わっていればエアポンプ２１を停止し第２弁装置２４を閉弁して第１液面２８が供給ポンプ３よりも低位にある状態を維持する。   Next, in step S9, it is determined whether or not the first liquid level 28 is no longer detected by the liquid level detection sensor 25. If the first liquid level 28 is no longer detected (YES), the process proceeds to step S10. If one liquid level 28 is detected (NO), it waits until it is no longer detected. In step S10, the air pump 21 is stopped, and then in step S11, the second valve device 24 is closed to close the second gas phase section 23 with respect to the atmosphere. That is, in steps S9 to S11, it is determined whether or not the reducing agent has been extracted from the supply pump 3. If the extraction has been completed, the air pump 21 is stopped, the second valve device 24 is closed, and the first valve device 24 is closed. The state where the liquid level 28 is lower than the supply pump 3 is maintained.

なお、エンジン停止中も還元剤が供給ポンプ３の内部に浸入しないように（つまり、第１液面２８が液面検知センサ２５により検知されないように）、別の制御フローに基づいてエアポンプ２１のオンオフや第１、第２弁装置２２、２４の開閉が制御される。   Note that the reducing agent does not enter the supply pump 3 even when the engine is stopped (that is, the first liquid level 28 is not detected by the liquid level detection sensor 25). ON / OFF and opening / closing of the first and second valve devices 22 and 24 are controlled.

〔実施例１の効果〕
実施例１の還元剤供給装置１は、第１気相部２０に空気を送り込むエアポンプ２１と、第１気相部２０を大気に対して開閉する第１弁装置２２と、供給ポンプ３の吸引口１７と同位に配されて第１タンク１４に装着される液面検知センサ２５とを備える。
これにより、エンジンが停止して還元剤の供給が不要になった場合、エアポンプ２１を起動して第１気相部２０を加圧することで第１液面２８を低下させ供給ポンプ３から還元剤を抜き出すことができる。このため、エンジン停止後に供給ポンプ３の内部に還元剤が残留して凍結するのを阻止し、還元剤の凍結による供給ポンプ３の破損を防止することができる。 [Effect of Example 1]
The reducing agent supply apparatus 1 according to the first embodiment includes an air pump 21 that sends air to the first gas phase unit 20, a first valve device 22 that opens and closes the first gas phase unit 20 with respect to the atmosphere, and a suction of the supply pump 3. A liquid level detection sensor 25 that is disposed in the same position as the mouth 17 and is attached to the first tank 14 is provided.
As a result, when the engine is stopped and the supply of the reducing agent becomes unnecessary, the air pump 21 is activated to pressurize the first gas phase portion 20 to lower the first liquid level 28 and reduce the reducing agent from the supply pump 3. Can be extracted. For this reason, it is possible to prevent the reducing agent from remaining in the supply pump 3 after the engine is stopped and freeze, and to prevent the supply pump 3 from being damaged by the freezing of the reducing agent.

また、エンジンが始動して還元剤の供給が必要になった場合、第１弁装置２２を開弁して加圧状態の第１気相部２０を減圧することで第１液面２８を上昇させ供給ポンプ３に還元剤を充填することができる。このため、供給ポンプ３の内部を空にしても、直ちに供給ポンプ３に還元剤を充填し、排ガスの方に還元剤を供給することができる。   In addition, when the engine is started and it is necessary to supply the reducing agent, the first valve device 22 is opened to depressurize the pressurized first gas phase section 20 to raise the first liquid level 28. The supply pump 3 can be filled with a reducing agent. For this reason, even if the inside of the supply pump 3 is emptied, it is possible to immediately fill the supply pump 3 with the reducing agent and supply the reducing agent to the exhaust gas.

また、液面検知センサ２５により供給ポンプ３における還元剤の充填状態を監視することができるので、エアポンプ２１や第１弁装置２２を効果的に制御することができる。
さらに、液面検知センサ２５を供給ポンプ３の吸引口１７と同位に配することにより、供給ポンプ３からの還元剤の抜き出しが終了したことを確実に検知することができる。 Moreover, since the filling state of the reducing agent in the supply pump 3 can be monitored by the liquid level detection sensor 25, the air pump 21 and the first valve device 22 can be effectively controlled.
Furthermore, by arranging the liquid level detection sensor 25 at the same position as the suction port 17 of the supply pump 3, it is possible to reliably detect that the extraction of the reducing agent from the supply pump 3 has been completed.

〔実施例２の特徴〕
実施例２の還元剤供給装置１の特徴を、図４および図５を用いて説明する。
実施例２の還元剤供給装置１によれば、エアポンプ２１は、第２気相部２３に空気を送り込めるように配されている。すなわち、実施例２のエアポンプ２１は、外気を吸引加圧して第２気相部２３に向けて吐出するものであり、第２気相部２３を加圧するときに作動するように制御される。そして、エアポンプ２１は、第２気相部２３を加圧することで第２タンク１５から第１タンク１４に還元剤を流入させる第２気相部加圧手段として機能する。さらに、エアポンプ２１は、第２気相部２３を加圧して第１液面２８を上昇させることで、供給ポンプ３の内部に還元剤を充填する充填手段として機能する。 [Features of Example 2]
The characteristics of the reducing agent supply apparatus 1 of Example 2 will be described with reference to FIGS. 4 and 5.
According to the reducing agent supply apparatus 1 of the second embodiment, the air pump 21 is arranged so as to send air to the second gas phase section 23. That is, the air pump 21 according to the second embodiment sucks and pressurizes outside air and discharges the air toward the second gas phase portion 23, and is controlled to operate when the second gas phase portion 23 is pressurized. The air pump 21 functions as a second gas phase portion pressurizing unit that pressurizes the second gas phase portion 23 to cause the reducing agent to flow from the second tank 15 into the first tank 14. Further, the air pump 21 functions as a filling means for filling the inside of the supply pump 3 with a reducing agent by pressurizing the second gas phase portion 23 to raise the first liquid level 28.

第２弁装置２４は、第２気相部２３を加圧するときに閉弁するように制御され、第２気相部２３を大気に対して閉鎖する。また、第２弁装置２４は、加圧された第２気相部２３を減圧するときに開弁するように制御され、第２気相部２３を大気に対して開放する。そして、第２弁装置２４は、加圧された第２気相部２３から空気を排出し第２気相部２３を減圧することで第１タンク１４から第２タンク１５に還元剤を流入させる第２気相部減圧手段として機能する。さらに、第２弁装置２４は、加圧された第２気相部２３を減圧して第１液面２８を低下させることで、供給ポンプ３の内部から還元剤を抜き出す抜出手段として機能する。   The second valve device 24 is controlled to close when the second gas phase portion 23 is pressurized, and closes the second gas phase portion 23 with respect to the atmosphere. The second valve device 24 is controlled to open when the pressurized second gas phase portion 23 is decompressed, and opens the second gas phase portion 23 to the atmosphere. Then, the second valve device 24 discharges air from the pressurized second gas phase section 23 and depressurizes the second gas phase section 23 to cause the reducing agent to flow into the second tank 15 from the first tank 14. It functions as a second gas phase part decompression means. Further, the second valve device 24 functions as an extraction means for extracting the reducing agent from the inside of the supply pump 3 by reducing the pressure of the pressurized second gas phase portion 23 and lowering the first liquid level 28. .

第１弁装置２２は、第２気相部２３を加圧するときおよび減圧するときの両方において開弁するように制御される。
まず、第１弁装置２２は、第２気相部２３を加圧して供給ポンプ３の内部に還元剤を充填するときに開弁する。これにより、第１弁装置２２は、第１液面２８の上昇（つまり、第２液面３０の低下）により加圧される第１気相部２０を大気に開放し第１気相部２０から空気を排出することで、供給ポンプ３への還元剤の充填をアシストする。 The first valve device 22 is controlled to open both when the second gas phase section 23 is pressurized and when the pressure is reduced.
First, the first valve device 22 is opened when the second gas phase section 23 is pressurized to fill the supply pump 3 with the reducing agent. Thus, the first valve device 22 opens the first gas phase part 20 pressurized by the rise of the first liquid level 28 (that is, the decrease of the second liquid level 30) to the atmosphere, and the first gas phase part 20 By discharging the air from the air, the filling of the supply pump 3 with the reducing agent is assisted.

また、第１弁装置２２は、第２気相部２３を減圧して供給ポンプ３の内部から還元剤を抜き出すときにも開弁する。これにより、第１弁装置２２は、第１液面２８の低下（つまり、第２液面３０の上昇）により減圧される第１気相部２０を大気に開放し第１気相部２０に外気を導くことで、供給ポンプ３からの還元剤の抜き出しをアシストする。   The first valve device 22 is also opened when the second gas phase section 23 is decompressed and the reducing agent is extracted from the supply pump 3. As a result, the first valve device 22 opens the first gas phase part 20, which is depressurized by the lowering of the first liquid level 28 (that is, the rising of the second liquid level 30) to the atmosphere, and the first gas phase part 20 The extraction of the reducing agent from the supply pump 3 is assisted by guiding the outside air.

〔実施例２の制御方法〕
実施例２の還元剤供給装置１による制御方法を、図６のフローチャートを用いて説明する。
まず、ステップＳ１でエンジンが始動したか否かを判断し、エンジンが始動していれば（ＹＥＳ）、ステップＳ２に進み、エンジンが始動していなければ（ＮＯ）、エンジンが始動するまで待機する。そして、ステップＳ２で、第１弁装置２２を開弁して第１気相部２０を大気に開放し、第２弁装置２４を閉弁して第２気相部２３を大気に対して閉鎖し、ステップＳ３でエアポンプ２１を起動する。これにより、第１液面２８が、図４に示すレベルから上昇を開始する。 [Control Method of Example 2]
The control method by the reducing agent supply apparatus 1 of Example 2 is demonstrated using the flowchart of FIG.
First, it is determined in step S1 whether or not the engine has been started. If the engine has been started (YES), the process proceeds to step S2, and if the engine has not been started (NO), the process waits until the engine is started. . In step S2, the first valve device 22 is opened to open the first gas phase portion 20 to the atmosphere, the second valve device 24 is closed to close the second gas phase portion 23 to the atmosphere. In step S3, the air pump 21 is activated. Thereby, the 1st liquid level 28 starts a raise from the level shown in FIG.

次に、ステップＳ４で第１液面２８が液面検知センサ２５により検知されたか否かを判断し、第１液面２８が検知されていれば（ＹＥＳ）、ステップＳ５に進み、第１液面２８が検知されていなければ（ＮＯ）、検知されるまで待機する。ステップＳ５では、供給ポンプ３を起動して供給ポンプ３から添加弁５への還元剤の供給を開始する。すなわち、ステップＳ４、Ｓ５では、供給ポンプ３の内部に還元剤の充填が始まったか否かを判断し、充填が始まっていれば供給ポンプ３を起動して添加弁５への供給を開始する。   Next, in step S4, it is determined whether or not the first liquid level 28 is detected by the liquid level detection sensor 25. If the first liquid level 28 is detected (YES), the process proceeds to step S5 and the first liquid level is detected. If the surface 28 is not detected (NO), it waits until it is detected. In step S <b> 5, the supply pump 3 is activated to start supplying the reducing agent from the supply pump 3 to the addition valve 5. That is, in steps S4 and S5, it is determined whether or not charging of the reducing agent has started in the supply pump 3, and if charging has started, the supply pump 3 is activated and supply to the addition valve 5 is started.

そして、ステップＳ６でエンジンが停止したか否かを判断し、エンジンが停止していれば（ＹＥＳ）、ステップＳ７に進み、エンジンが停止していなければ（ＮＯ）、エンジンが停止するまで待機する。なお、エンジン運転中の供給ポンプ３およびエアポンプ２１のオンオフや第１、第２弁装置２２、２４の開閉は別の制御フローに基づいて制御される。
ステップＳ７では、供給ポンプ３を停止して供給ポンプ３から添加弁５への還元剤の供給を停止する。 In step S6, it is determined whether or not the engine has stopped. If the engine has stopped (YES), the process proceeds to step S7. If the engine has not stopped (NO), the process waits until the engine stops. . Note that on / off of the supply pump 3 and the air pump 21 and the opening and closing of the first and second valve devices 22 and 24 during engine operation are controlled based on another control flow.
In step S7, the supply pump 3 is stopped and supply of the reducing agent from the supply pump 3 to the addition valve 5 is stopped.

次に、ステップＳ８でエアポンプ２１を停止し、ステップＳ９で第１、第２弁装置２２、２４を両方とも開弁して第１、第２気相部２０、２３を両方とも大気に開放する。これにより、第１液面２８が、図５に示すレベルから低下を開始する。   Next, in step S8, the air pump 21 is stopped, and in step S9, both the first and second valve devices 22, 24 are opened to open both the first and second gas phase units 20, 23 to the atmosphere. . Thereby, the 1st liquid level 28 starts a fall from the level shown in FIG.

次に、ステップＳ１０で第１液面２８が液面検知センサ２５により検知されなくなったか否かを判断し、第１液面２８が検知されなくなっていれば（ＹＥＳ）、ステップＳ１１に進み、第１液面２８が検知されていれば（ＮＯ）、検知されなくなるまで待機する。ステップＳ１１では、第１、第２弁装置２２、２４を両方とも閉弁して第１、第２気相部２０、２３を両方とも大気に対して閉鎖する。すなわち、ステップＳ１０、Ｓ１１では、供給ポンプ３の内部から還元剤の抜き出しが終わったか否かを判断し、抜き出しが終わっていれば第１、第２弁装置２２、２４を両方とも閉弁して第１液面２８が供給ポンプ３よりも低位にある状態を維持する。   Next, in step S10, it is determined whether or not the first liquid level 28 is no longer detected by the liquid level detection sensor 25. If the first liquid level 28 is no longer detected (YES), the process proceeds to step S11. If one liquid level 28 is detected (NO), it waits until it is no longer detected. In step S11, both the first and second valve devices 22, 24 are closed, and both the first and second gas phase units 20, 23 are closed to the atmosphere. That is, in steps S10 and S11, it is determined whether or not the reducing agent has been extracted from the inside of the supply pump 3. If the extraction has been completed, both the first and second valve devices 22 and 24 are closed. The state where the first liquid level 28 is lower than the supply pump 3 is maintained.

なお、エンジン停止中も還元剤が供給ポンプ３の内部に浸入しないように（つまり、第１液面２８が液面検知センサ２５により検知されないように）、別の制御フローに基づいて第１、第２弁装置２２、２４の開閉が制御される。   Note that the reducing agent does not enter the supply pump 3 even when the engine is stopped (that is, the first liquid level 28 is not detected by the liquid level detection sensor 25). The opening and closing of the second valve devices 22 and 24 are controlled.

〔変形例〕
実施例１、２の還元剤供給装置１によれば、エアポンプ２１は、外気を吸引加圧してタンク２の気相部に向けて吐出するものであったが、気相部の空気を吸引して大気に向けて吐出するようにしてもよい。 [Modification]
According to the reducing agent supply device 1 of the first and second embodiments, the air pump 21 sucks and pressurizes the outside air and discharges it toward the gas phase portion of the tank 2. Then, it may be discharged toward the atmosphere.

この場合、エアポンプ２１を第１気相部２０から空気を吸引できるように配すれば、エアポンプ２１を第１気相部減圧手段さらに充填手段として機能させることができ、第１弁装置２２を第１気相部加圧手段さらに抜出手段として機能させることができる。そして、第２弁装置２４の開弁により供給ポンプ３に対する還元剤の充填、抜き出しをアシストすることができる。   In this case, if the air pump 21 is arranged so that air can be sucked from the first gas phase portion 20, the air pump 21 can function as the first gas phase portion pressure reducing means and further the filling means, and the first valve device 22 is 1 gas phase part pressurizing means and further functioning as an extracting means. Then, the opening and closing of the second valve device 24 can assist the filling and extraction of the reducing agent with respect to the supply pump 3.

また、エアポンプ２１を第２気相部２３から空気を吸引できるように配すれば、エアポンプ２１を第２気相部減圧手段さらに抜出手段として機能させることができ、第２弁装置２４を第２気相部加圧手段さらに充填手段として機能させることができる。そして、第１弁装置２２の開弁により供給ポンプ３に対する還元剤の充填、抜き出しをアシストすることができる。   Further, if the air pump 21 is arranged so as to be able to suck air from the second gas phase portion 23, the air pump 21 can function as the second gas phase portion pressure reducing means and further the extracting means, and the second valve device 24 can be 2 Gas phase part pressurizing means and further functioning as a filling means. Then, the opening and closing of the first valve device 22 can assist the filling and extraction of the reducing agent with respect to the supply pump 3.

また、２機のエアポンプ２１を装備し、２機のエアポンプ２１を、各々、第１、第２気相部２０、２３に外気を送り込めるように配して、一方のエアポンプ２１を第１気相部加圧手段さらに抜出手段として機能させ、他方のエアポンプ２１を第２気相部加圧手段さらに充填手段として機能させ、第１、第２弁装置２２、２４の開閉弁により供給ポンプ３に対する還元剤の充填、抜き出しをアシストするようにしてもよい。   Also, two air pumps 21 are provided, and the two air pumps 21 are arranged so as to be able to send outside air to the first and second gas phase sections 20 and 23, respectively, and one air pump 21 is connected to the first air pump 21. The phase pump means further functions as an extraction means, the other air pump 21 functions as a second gas phase pressure means, and further as a filling means, and the supply pump 3 is operated by the opening and closing valves of the first and second valve devices 22 and 24. You may make it assist the filling of the reducing agent with respect to, and extraction.

また、２機のエアポンプ２１を、各々、第１、第２気相部２０、２３から空気を吸引できるように配して、一方のエアポンプ２１を第１気相部減圧手段さらに充填手段として機能させ、他方のエアポンプ２１を第２気相部減圧手段さらに抜出手段として機能させ、第１、第２弁装置２２、２４の開閉弁により供給ポンプ３に対する還元剤の充填、抜き出しをアシストするようにしてもよい。   Also, two air pumps 21 are arranged so that air can be sucked from the first and second gas phase parts 20 and 23, respectively, and one air pump 21 functions as a first gas phase part pressure reducing means and a filling means. The other air pump 21 is made to function as the second gas phase pressure reducing means and the extraction means, and the opening and closing valves of the first and second valve devices 22 and 24 assist the filling and extraction of the reducing agent with respect to the supply pump 3. It may be.

また、実施例１、２の還元剤供給装置１によれば、抜出手段と充填手段とが別機器であったが、抜出手段および充填手段の機能を１つの機器に具備させることもできる。
例えば、エアポンプ２１を、タンク２の気相部へ空気を吐出する機能と、タンク２の気相部から空気を吸引する機能とを切り替えることができるように設ければ、１機のエアポンプ２１を抜出手段および充填手段として機能させることができる。 Moreover, according to the reducing agent supply apparatus 1 of Example 1, 2, although the extraction means and the filling means were separate apparatuses, the functions of the extraction means and the filling means can be provided in one apparatus. .
For example, if the air pump 21 is provided so that the function of discharging air to the gas phase part of the tank 2 and the function of sucking air from the gas phase part of the tank 2 can be switched, one air pump 21 is provided. It can function as an extraction means and a filling means.

また、３方切替弁を、加圧源および減圧源とタンク２の気相部との連通状態を切り替えることができるように配すれば、この１つの３方切替弁を、抜出手段および充填手段として機能させることができる。なお、車両には、加圧源として利用できるエアコンプレッサや、減圧源として利用できるエンジンへの吸気管が具備されているので、このような構成を容易に組むことができる。   Further, if the three-way switching valve is arranged so that the communication state between the pressurization source and the decompression source and the gas phase portion of the tank 2 can be switched, this one-way three-way switching valve is connected to the extraction means and the filling unit. It can function as a means. Since the vehicle is provided with an air compressor that can be used as a pressurizing source and an intake pipe to an engine that can be used as a depressurizing source, such a configuration can be easily assembled.

なお、抜出手段および充填手段の機能を、加圧源および減圧源とタンク２の気相部との連通状態を切り替える切替弁のみで実行する場合、例えば、加圧源とタンク２の気相部との連通状態を切り替える１つの２方切替弁、および減圧源とタンク２の気相部との連通状態を切り替える別の２方切替弁のように複数の切替弁により抜出手段および充填手段の機能を実行することもできる。   When the functions of the extraction means and the filling means are executed only by a switching valve that switches the communication state between the pressurization source and the decompression source and the gas phase part of the tank 2, for example, the gas phase of the pressurization source and the tank 2 is used. Extraction means and filling means by a plurality of switching valves, such as one two-way switching valve that switches the communication state with the part, and another two-way switching valve that switches the communication state between the decompression source and the gas phase part of the tank 2 It is also possible to execute the function.

実施例１、２の検出手段は、低位検知手段として機能する液面検知センサ２５であったが、同様の液面検知センサ２５を供給ポンプ３の吐出口１６と同位の位置に配すれば、この液面検知センサ２５を、第１液面２８が供給ポンプ３よりも高位にあることを検知する高位検知手段として機能させることができる。この場合、供給ポンプ３への還元剤の充填が終了したことを確実に検知することができる。   The detection means of the first and second embodiments is the liquid level detection sensor 25 that functions as a low level detection means. However, if the same liquid level detection sensor 25 is disposed at a position at the same position as the discharge port 16 of the supply pump 3, The liquid level detection sensor 25 can function as a high level detection unit that detects that the first liquid level 28 is higher than the supply pump 3. In this case, it is possible to reliably detect that the supply of the reducing agent to the supply pump 3 has been completed.

また、吐出口１６と同位および吸引口１７と同位の両方の位置に、各々、液面検知センサ２５を配すれば、高位検知手段および低位検知手段の両方の機能を具備することができるので、充填終了および抜き出し終了の両方を確実に検知することができる。また、液面に応じて連続的に出力を可変できる液面センサを第１タンク１４に装備すれば、この液面センサを高位検知手段および低位検知手段の両方として機能させることができる。この場合、１機の液面センサを装備すれば、抜き出し終了および充填終了の両方を確実に検知することができる。   In addition, if the liquid level detection sensor 25 is disposed at both the discharge port 16 and the suction port 17 and the suction port 17, the functions of both the high level detection unit and the low level detection unit can be provided. It is possible to reliably detect both the end of filling and the end of extraction. Further, if the first tank 14 is equipped with a liquid level sensor capable of continuously changing the output in accordance with the liquid level, the liquid level sensor can function as both a high level detection unit and a low level detection unit. In this case, if one liquid level sensor is equipped, both the end of extraction and the end of filling can be reliably detected.

さらに、検出手段として機能する機器を還元剤供給装置１に具備しなくても、抜き出しや充填に要する時間の見込み値をＥＣＵ１０に記憶しておき、抜き出し開始時期または充填開始時期からの経時と見込み値との比較により抜き出し終了または充填終了を判断してもよい。また、充填終了は、触媒通過後の排ガスのＮＯｘ濃度が正常になっているか否かに基づいて判断することもできる。 Further, even if the reducing agent supply apparatus 1 does not include a device that functions as a detection unit, an estimated value of the time required for extraction or filling is stored in the ECU 10 and the time from the extraction start time or the filling start time is expected. Completion of extraction or filling may be determined by comparison with the value. Furthermore, end-of-fill can also be the concentration of NO x exhaust gas after passing through the catalyst is determined based on whether or not it is normal.

実施例１、２のタンク２は、第１、第２タンク１４、１５に区画されていたが、図７に示すように、区画せずに１つのタンク２とし、タンク２の外部に供給ポンプ３を配し（以下、タンク２の外部にある供給ポンプ３を外部供給ポンプ３Ａとする）、外部供給ポンプ３Ａの吸引口１７に、タンク２の液相部に通じる供給流路３１を接続してもよい。この場合、タンク２の気相部に外気を送り込むエアポンプ２１を充填手段、タンク２の気相部を大気に対して開閉する弁装置３２を抜出手段として機能させることができる。   The tanks 2 of the first and second embodiments were partitioned into the first and second tanks 14 and 15, but as shown in FIG. 3 (hereinafter, the supply pump 3 outside the tank 2 is referred to as an external supply pump 3A), and a supply passage 31 leading to the liquid phase portion of the tank 2 is connected to the suction port 17 of the external supply pump 3A. May be. In this case, the air pump 21 that sends outside air to the gas phase part of the tank 2 can function as a filling means, and the valve device 32 that opens and closes the gas phase part of the tank 2 with respect to the atmosphere can function as an extraction means.

また、エアポンプ２１をタンク２の気相部から空気を排出できるように配すれば、このエアポンプ２１を抜出手段として機能させ、弁装置３２を充填手段として機能させることもできる。
なお、供給ポンプ３の吐出側に装着される圧力センサ３３の出力は、供給ポンプ３への還元剤の充填が終了して添加弁５への供給が可能か否かを判断するための指標として利用される。 Further, if the air pump 21 is arranged so that air can be discharged from the gas phase part of the tank 2, the air pump 21 can function as an extraction means and the valve device 32 can function as a filling means.
The output of the pressure sensor 33 mounted on the discharge side of the supply pump 3 serves as an index for determining whether or not the supply of the reducing agent to the supply pump 3 is completed and supply to the addition valve 5 is possible. Used.

供給ポンプに還元剤が充填された状態の還元剤供給装置の構成図である（実施例１）。(Example 1) which is a block diagram of the reducing agent supply apparatus of the state with which the supply pump was filled with the reducing agent. 供給ポンプから還元剤が抜き出された状態の還元剤供給装置の構成図である（実施例１）。(Example 1) which is a block diagram of the reducing agent supply apparatus of the state with which the reducing agent was extracted from the supply pump. 還元剤供給装置による制御処理を示すフローチャートである（実施例１）。6 is a flowchart illustrating a control process by a reducing agent supply device (Example 1). 供給ポンプから還元剤が抜き出された状態の還元剤供給装置の構成図である（実施例２）。(Example 2) which is a block diagram of the reducing agent supply apparatus of the state by which the reducing agent was extracted from the supply pump. 供給ポンプに還元剤が充填された状態の還元剤供給装置の構成図である（実施例２）。(Example 2) which is a block diagram of the reducing agent supply apparatus of the state with which the supply pump was filled with the reducing agent. 還元剤供給装置による制御処理を示すフローチャートである（実施例２）。It is a flowchart which shows the control processing by a reducing agent supply apparatus (Example 2). 還元剤供給装置の要部を示す要部構成図である（変形例）。It is a principal part block diagram which shows the principal part of a reducing agent supply apparatus (modification).

符号の説明Explanation of symbols

１ 還元剤供給装置
２ タンク
３ 供給ポンプ
１０ ＥＣＵ（制御手段）
１４ 第１タンク
１５ 第２タンク
２０ 第１気相部（第１タンクの気相部）
２１ エアポンプ（抜出手段、充填手段、第１気相部加圧手段、第１気相部減圧手段、第２気相部加圧手段、第２気相部減圧手段）
２２ 第１弁装置（抜出手段、充填手段、第１気相部加圧手段、第１気相部減圧手段）
２３ 第２気相部（第２タンクの気相部）
２４ 第２弁装置（抜出手段、充填手段、第２気相部加圧手段、第２気相部減圧手段）
２５ 液面検知センサ（検出手段、低位検知手段、高位検知手段）
２８ 第１液面（第１タンクにおける還元剤の液面）
３Ａ 外部供給ポンプ
３１ 供給流路
３２ 弁装置（抜出手段、充填手段） DESCRIPTION OF SYMBOLS 1 Reducing agent supply apparatus 2 Tank 3 Supply pump 10 ECU (control means)
14 1st tank 15 2nd tank 20 1st gas phase part (gas phase part of the 1st tank)
21 Air pump (extraction means, filling means, first gas phase pressurizing means, first gas phase pressure reducing means, second gas phase pressure increasing means, second gas phase pressure reducing means)
22 1st valve apparatus (extraction means, filling means, 1st gas phase part pressurizing means, 1st gas phase part pressure reducing means)
23 Second gas phase part (gas phase part of the second tank)
24 Second valve device (extraction means, filling means, second gas phase pressurizing means, second gas phase pressure reducing means)
25 Liquid level detection sensor (detection means, low level detection means, high level detection means)
28 First liquid level (reducing agent liquid level in the first tank)
3A External supply pump 31 Supply flow path 32 Valve device (extraction means, filling means)

Claims (9)

エンジンの排ガスに還元剤を供給する還元剤供給装置において、
液状の還元剤を貯留して液相部を形成するタンクから還元剤を吸引し排ガスの方に供給する供給ポンプと、
前記タンクの内部で液相部の上部領域を占める気相部の圧力を操作することで、前記供給ポンプの内部から前記タンクに還元剤を抜き出す抜出手段と、
前記タンクの気相部の圧力を操作することで、前記タンクから前記供給ポンプの内部に還元剤を充填する充填手段と、
前記エンジンの運転状態に応じて前記抜出手段および前記充填手段を制御する制御手段とを備える還元剤供給装置。 In the reducing agent supply device that supplies the reducing agent to the exhaust gas of the engine,
A supply pump that sucks the reducing agent from a tank that stores the liquid reducing agent and forms a liquid phase portion, and supplies the reducing agent to the exhaust gas;
By extracting the reducing agent from the inside of the supply pump to the tank by operating the pressure of the gas phase portion occupying the upper region of the liquid phase portion inside the tank,
Filling means for filling a reducing agent from the tank into the supply pump by manipulating the pressure in the gas phase of the tank;
A reducing agent supply apparatus comprising: a control unit that controls the extraction unit and the filling unit according to an operating state of the engine. 請求項１に記載の還元剤供給装置において、
前記タンクは、前記供給ポンプを内部に収容して前記供給ポンプにより還元剤を吸引される第１タンクと、この第１タンクの液相部と連通する液相部を形成する第２タンクとに区画され、
前記抜出手段は、前記第１タンクの気相部を加圧することで前記第１タンクから前記第２タンクに還元剤を流入させる第１気相部加圧手段であり、
前記充填手段は、前記第１タンクの気相部を減圧することで前記第２タンクから前記第１タンクに還元剤を流入させる第１気相部減圧手段であることを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 1,
The tank includes a first tank in which the supply pump is accommodated and a reducing agent is sucked by the supply pump, and a second tank that forms a liquid phase portion communicating with the liquid phase portion of the first tank. Partitioned,
The extraction means is a first gas phase part pressurizing means for causing a reducing agent to flow from the first tank into the second tank by pressurizing the gas phase part of the first tank,
Reducing agent supply, wherein the filling means is a first gas phase part pressure reducing means for reducing the gas phase part of the first tank to flow the reducing agent from the second tank into the first tank. apparatus. 請求項１に記載の還元剤供給装置において、
前記タンクは、前記供給ポンプを内部に収容して前記供給ポンプにより還元剤を吸引される第１タンクと、前記第１タンクの液相部と連通する液相部を形成する第２タンクとに区画され、
前記抜出手段は、前記第２タンクの気相部を減圧することで前記第１タンクから前記第２タンクに還元剤を流入させる第２気相部減圧手段であり、
前記充填手段は、前記第２タンクの気相部を加圧することで前記第２タンクから前記第１タンクに還元剤を流入させる第２気相部加圧手段であることを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 1,
The tank includes a first tank in which the supply pump is accommodated and a reducing agent is sucked by the supply pump, and a second tank that forms a liquid phase portion communicating with the liquid phase portion of the first tank. Partitioned,
The extraction means is a second gas phase pressure reducing means for reducing the gas phase of the second tank to flow a reducing agent from the first tank into the second tank;
The filling means is a second gas phase part pressurizing means for injecting the reducing agent from the second tank into the first tank by pressurizing the gas phase part of the second tank. Feeding device. 請求項１に記載の還元剤供給装置において、
前記供給ポンプは前記タンクの外部に配される外部供給ポンプであり、この外部供給ポンプの吸引口には前記タンクの液相部に通じる供給流路が接続し、
前記抜出手段は、前記タンクの気相部を減圧することで、前記供給流路を介して前記供給ポンプの内部から還元剤を抜き出し、
前記充填手段は、前記タンクの気相部を加圧することで、前記供給流路を介して前記供給ポンプの内部に還元剤を充填することを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 1,
The supply pump is an external supply pump disposed outside the tank, and a supply flow path leading to the liquid phase portion of the tank is connected to the suction port of the external supply pump,
The extraction means extracts the reducing agent from the inside of the supply pump through the supply flow path by depressurizing the gas phase part of the tank,
The filling means fills the inside of the supply pump with the reducing agent through the supply flow path by pressurizing the gas phase part of the tank. 請求項１ないし請求項４の内のいずれか１つに記載の還元剤供給装置において、
前記抜出手段および前記充填手段は、前記タンクの気相部へ空気を吐出する機能と前記タンクの気相部から空気を吸引する機能とを切り替えることができる１機のエアポンプであることを特徴とする還元剤供給装置。 In the reducing agent supply apparatus according to any one of claims 1 to 4,
The extraction means and the filling means are a single air pump capable of switching between a function of discharging air to the gas phase part of the tank and a function of sucking air from the gas phase part of the tank. A reducing agent supply device. 請求項１ないし請求項４の内のいずれか１つに記載の還元剤供給装置において、
前記抜出手段および前記充填手段は、加圧源および減圧源と前記タンクの気相部との連通状態を切り替える１または複数の切替弁であることを特徴とする還元剤供給装置。 In the reducing agent supply apparatus according to any one of claims 1 to 4,
The reducing agent supply apparatus according to claim 1, wherein the extraction unit and the filling unit are one or a plurality of switching valves that switch a communication state between a pressurization source and a decompression source and a gas phase portion of the tank. 請求項１ないし請求項６の内のいずれか１つに記載の還元剤供給装置において、
前記供給ポンプの内部における還元剤の充填状態を検出する検出手段を備えることを特徴とする還元剤供給装置。 In the reducing agent supply apparatus according to any one of claims 1 to 6,
A reducing agent supply apparatus comprising a detecting means for detecting a filling state of the reducing agent inside the supply pump. 請求項７に記載の還元剤供給装置において、
前記タンクは、前記供給ポンプを内部に収容して前記供給ポンプにより還元剤を吸引される第１タンクと、この第１タンクの液相部と連通する液相部を形成する第２タンクとに区画され、
前記検出手段は、前記第１タンクにおける還元剤の液面が前記供給ポンプよりも低位にあることを検知する低位検知手段であることを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 7,
The tank includes a first tank in which the supply pump is accommodated and a reducing agent is sucked by the supply pump, and a second tank that forms a liquid phase portion communicating with the liquid phase portion of the first tank. Partitioned,
The reducing agent supply apparatus according to claim 1, wherein the detecting means is a low level detecting means for detecting that the liquid level of the reducing agent in the first tank is lower than the supply pump. 請求項７に記載の還元剤供給装置において、
前記タンクは、前記供給ポンプを内部に収容して前記供給ポンプにより還元剤を吸引される第１タンクと、この第１タンクの液相部と連通する液相部を形成する第２タンクとに区画され、
前記検出手段は、前記第１タンクにおける還元剤の液面が前記供給ポンプよりも高位にあることを検知する高位検知手段であることを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 7,
The tank includes a first tank in which the supply pump is accommodated and a reducing agent is sucked by the supply pump, and a second tank that forms a liquid phase portion communicating with the liquid phase portion of the first tank. Partitioned,
The reducing agent supply apparatus according to claim 1, wherein the detecting means is a high level detecting means for detecting that the liquid level of the reducing agent in the first tank is higher than the supply pump.
JP2007036859A 2007-02-16 2007-02-16 Reducer supply device Withdrawn JP2008202434A (en)

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KR20110097943A (en) * 2008-12-10 2011-08-31 콘티넨탈 오토모티브 게엠베하 Method and device for adapting the injection agent supply in an injection system, and exhaust gas aftertreatment system

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DE102008046630A1 (en) * 2008-09-10 2010-03-11 Emitec Gesellschaft Für Emissionstechnologie Mbh Modular tank system for a liquid reducing agent with a sump element
DE102010040453A1 (en) * 2010-09-09 2012-03-15 Robert Bosch Gmbh Exhaust gas aftertreatment system and method for metering a medium into the exhaust gas line of an internal combustion engine
DE102020214287A1 (en) 2020-11-13 2022-05-19 Robert Bosch Gesellschaft mit beschränkter Haftung Method for monitoring a reducing agent tank

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DE10048246A1 (en) 2000-09-29 2002-04-11 Bosch Gmbh Robert Device to generate reducing agent/air mixture for IC engines has pump with pump housing connected to mixing chamber body, which forms cover for pump housing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110097943A (en) * 2008-12-10 2011-08-31 콘티넨탈 오토모티브 게엠베하 Method and device for adapting the injection agent supply in an injection system, and exhaust gas aftertreatment system
KR101628048B1 (en) 2008-12-10 2016-06-08 콘티넨탈 오토모티브 게엠베하 Method for adapting the injection agent supply in an injection system

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