JP4075594B2 - Heat storage device for internal combustion engine - Google Patents

Heat storage device for internal combustion engine Download PDF

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JP4075594B2
JP4075594B2 JP2002356986A JP2002356986A JP4075594B2 JP 4075594 B2 JP4075594 B2 JP 4075594B2 JP 2002356986 A JP2002356986 A JP 2002356986A JP 2002356986 A JP2002356986 A JP 2002356986A JP 4075594 B2 JP4075594 B2 JP 4075594B2
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heat storage
storage container
internal combustion
combustion engine
heat medium
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JP2004190517A (en
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孝之 大塚
宏樹 一瀬
裕 沢田
泰広 久世
錬太郎 黒木
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Toyota Motor Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、冷却水などの熱媒体を蓄熱状態で貯留すると共に、内燃機関等の運転状態または温度等に応じて、貯留した熱媒体を該内燃機関等に供給する内燃機関の蓄熱装置に関する。
【０００２】
【従来の技術】
近年、自動車などに搭載される内燃機関においては、冷間時の始動性、燃焼安定性、排気エミッション、或いは室内暖房性能などの向上を目的として、冷却水等の熱媒体を蓄熱状態で貯留する蓄熱容器を熱媒体通路に備え、蓄熱容器内に高温の熱媒体を貯留すると共に、内燃機関等の運転状態または温度等に応じて、貯留した熱媒体を該内燃機関等に供給する蓄熱装置が提案されている。
【０００３】
上記したような内燃機関の蓄熱装置においては、蓄熱容器や熱媒体通路等の故障による異常発生を診断することが重要である。
【０００４】
従来の内燃機関の蓄熱装置における蓄熱容器や熱媒体通路等の故障診断装置としては、例えば、内燃機関内の冷却水の温度を検出する冷却水温検出手段を備え、前記内燃機関停止時に前記冷却水温検出手段によって検出された冷却水温から前記内燃機関停止時の蓄熱容器内における蓄熱水温を推定し、この推定された前記内燃機関停止時の蓄熱水温と、前記内燃機関停止時からの経過時間と、に基づき前記内燃機関の再始動時の蓄熱水温を推定し、この推定された前記内燃機関再始動時の蓄熱水温が十分に高いにもかかわらず、前記内燃機関の再始動時の暖機中における冷却水温の上昇率が予め設定された所定値を下回っているときは前記冷却水路を含む前記蓄熱容器の故障であると診断する内燃機関用熱制御システムの故障診断装置、または、蓄熱容器内の蓄熱水の温度を検出する蓄熱水温検出手段を備え、前記内燃機関停止時に前記蓄熱水温検出手段によって検出された蓄熱水温と、前記内燃機関停止時からの経過時間と、前記内燃機関再始動時に前記蓄熱水温検出手段によって検出された蓄熱水温と、に基づき算出された蓄熱水温の下降率が予め設定された所定値を上回っているときは前記蓄熱容器の故障であると診断する内燃機関用熱制御システムの故障診断装置、が知られている（例えば、特許文献１参照）。
【０００５】
【特許文献１】
特開平１１−１８２３０７号公報
【０００６】
【発明が解決しようとする課題】
ところで、内燃機関の蓄熱装置において、冷却水等の熱媒体の温度を検出する温度検出手段に異常が生じた場合、蓄熱容器内に貯留した熱媒体を運転状態または温度等に応じて内燃機関等に好適に供給することが困難となり、また、上記したような熱媒体通路や蓄熱容器等の故障診断を正確に行うことが出来なくなる。
【０００７】
そこで、本発明は上記したような実情に鑑みてなされたものであり、冷却水等の熱媒体を蓄熱状態で貯留すると共に、内燃機関等の運転状態または温度等に応じて、貯留した熱媒体を該内燃機関等に供給する蓄熱容器を備えた内燃機関において、前記熱媒体の温度を検出する温度検出手段の異常を検出することが可能な技術を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明は、上記課題を解決するために以下のような手段を採用した。
即ち、本発明に係る内燃機関の蓄熱装置は、
熱媒体を蓄熱状態で貯留する蓄熱容器と、
前記蓄熱容器と内燃機関とを経由して前記熱媒体が循環する熱媒体通路と、
前記熱媒体通路において、前記熱媒体の流れに沿って上流側と下流側とに設けられ、前記熱媒体の温度を検出する少なくとも２つの温度検出手段と、
前記内燃機関が所定の運転状態の時に、前記温度検出手段のうち、一方の温度検出手段の出力値と他方の温度検出手段の出力値とを比較することによって、前記一方の温度検出手段の異常を判定する判定手段と、
を備える構成としてもよい。
【０００９】
この発明は、蓄熱容器と内燃機関とを経由して熱媒体が循環する熱媒体通路において、熱媒体の流れに沿って上流側と下流側とに設けられ、前記熱媒体の温度を検出する少なくとも２つの温度検出手段のうち、一方の温度検出手段の出力値と他方の温度検出手段の出力値とを前記内燃機関が所定の運転状態にある時に比較することによって、一方の温度検出手段の異常を検出することを最大の特徴とする。
【００１０】
内燃機関が所定運転状態にある時の熱媒体通路における上流側熱媒体の温度と下流側熱媒体の温度との相互関係は、実験上または経験上予め求めることができる。
【００１１】
そこで、本発明に係る内燃機関の蓄熱装置においては、熱媒体通路の上流側と下流側とに設けられた少なくとも２つの温度検出手段のうち、他方の温度検出手段は正常であるとし、内燃機関が所定の運転状態にある時に、一方の温度検出手段の検出値と他方の温度検出手段の検出値との相互関係が、予め求められた所定の相互関係と異なる場合、一方の温度検出手段の異常と判断する。
【００１２】
本発明に係る内燃機関の蓄熱装置において、温度検出手段は、少なくとも、蓄熱容器に出入りする熱媒体の温度を検出する蓄熱容器側温度検出手段と内燃機関を流通する熱媒体の温度を検出する内燃機関側温度検出手段とを有する構成としてもよい。
【００１３】
この場合、内燃機関側温度検出手段については、例えば、内燃機関運転中において、該内燃機関側温度検出手段の検出値が、内燃機関の運転状態に応じて予め定められた所定温度範囲内にない場合、または、予め定められた所定時間の間、固定値であった場合、該内燃機関側温度検出手段の異常と判断する等の異常検出が可能である。そのため、本発明においては、内燃機関側温度検出手段は正常とし、蓄熱容器側温度検出手段の検出値と内燃機関側温度検出手段の検出値とを比較することによって、蓄熱容器側温度検出手段の異常を判定する。
【００１４】
例えば、内燃機関の暖機時において、暖機開始から所定時間経過後、蓄熱容器側温度検出手段の検出値が内燃機関側温度検出手段の検出値より低い場合、判定手段は蓄熱容器側温度検出手段の異常であると判定するとしてもよい。
【００１５】
内燃機関の暖機時においては、蓄熱容器に貯留されていた高温の熱媒体が熱媒体通路を介して内燃機関に流入する。このとき、内燃機関に流入した熱媒体は、熱媒体通路を経由しており、また、内燃機関を熱伝導によって加熱させるため、蓄熱容器から流出した直後に比べ温度が低くなる。従って、内燃機関側温度検出手段と蓄熱容器側温度検出手段とが共に正常ならば、内燃機関の暖機開始から所定時間経過後の蓄熱容器側温度検出手段の検出値は内燃機関側温度検出手段の検出値より高くなる。
【００１６】
即ち、本発明に係る内燃機関の蓄熱装置において、内燃機関の暖機開始から所定時間経過後、蓄熱容器側温度検出手段の検出値が内燃機関側温度検出手段の検出値より低い場合、判定手段は、蓄熱容器側温度検出手段が異常であると判定する。
【００１７】
また、例えば、蓄熱容器に高温の熱媒体を回収する時において、回収開始から所定時間経過後、蓄熱容器側温度検出手段の検出値と内燃機関側温度検出手段の検出値との差が所定値以上である場合、判定手段は蓄熱容器側温度検出手段の異常であると判定するとしてもよい。
【００１８】
蓄熱容器に高温の熱媒体を回収するときは、内燃機関によって加熱された熱媒体が熱媒体通路を介して蓄熱容器に流入する。従って、内燃機関側温度検出手段と蓄熱容器側温度検出手段とが共に正常ならば、熱媒体回収開始から所定時間経過後には、蓄熱容器側温度検出手段の検出値は内燃機関側温度検出手段の検出値とほぼ同じとなる。
【００１９】
即ち、本発明に係る内燃機関の蓄熱装置において、蓄熱容器への高温の熱媒体回収開始から所定時間経過後、蓄熱容器側温度検出手段の検出値と内燃機関側温度検出手段の検出値との差が所定値以上である場合、判定手段は、蓄熱容器側温度検出手段が異常であると判定する。
【００２０】
本発明に係る内燃機関の蓄熱装置においては、熱媒体通路に熱媒体を循環させる熱媒体循環手段または／および熱媒体通路での熱媒体の循環を停止する熱媒体循環停止手段をさらに備え、判定手段は、熱媒体循環手段によって熱媒体の循環が開始された時または／および熱媒体循環停止手段によって熱媒体の循環が停止された時から所定時間経過後に蓄熱容器側温度検出手段の異常を判定するとしてもよい。
【００２１】
これは、熱媒体の循環開始または停止の前後では蓄熱容器に出入りする熱媒体の温度および内燃機関を流通する熱媒体の温度は変化し、所定時間が経過した後に、蓄熱容器側温度検出手段の異常判定が可能となる温度に到達するためである。
【００２２】
例えば、熱媒体の循環が開始された時の蓄熱容器側温度検出手段の検出値と熱媒体の循環が開始された時から所定時間経過後の蓄熱容器側温度検出手段の検出値との差が所定値以下の場合、蓄熱容器側温度検出手段の異常であると判定するとしてもよい。
【００２３】
また、例えば、熱媒体の循環が停止された時の蓄熱容器側温度検出手段の検出値と熱媒体の循環が停止された時から所定時間経過後の蓄熱容器側温度検出手段の検出値との差が所定値以下の場合、蓄熱容器側温度検出手段の異常であると判定するとしてもよい。
【００２４】
【発明の実施の形態】
以下、本発明に係る内燃機関の蓄熱装置の具体的な実施の形態について図面に基づいて説明する。
【００２５】
（第１の実施の形態）
図１は本発明の第１の実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系を示す概略構成図である。
【００２６】
内燃機関１は、シリンダヘッド１ａとシリンダブロック１ｂを備えている。シリンダヘッド１ａ及びシリンダブロック１ｂの各々には、本発明に係る熱媒体としての冷却水を流通させるためのヘッド側冷却水路２ａとブロック側冷却水路２ｂとが形成され、それらのヘッド側冷却水路２ａとブロック側冷却水路２ｂとは相互に連通している。
【００２７】
前記ヘッド側冷却水路２ａには、第１冷却水路４が接続され、この第１冷却水路４は、ラジエター５の冷却水流入口に接続されている。前記ラジエター５の冷却水流出口は、第２冷却水路６を介してサーモスタットバルブ７に接続されている。
【００２８】
前記サーモスタットバルブ７には、前記第２冷却水路６の他に第３冷却水路８とバイパス水路９とが接続されている。第３冷却水路８は、内燃機関１の機関出力軸（クランクシャフト）の回転トルクを駆動源とする機械式ウォーターポンプ１０の吸込口に接続され、バイパス水路９は、前記ヘッド側冷却水路２ａに接続されている。
【００２９】
前記機械式ウォーターポンプ１０の吐出口には、前記ブロック側冷却水路２ｂが接続されている。
【００３０】
前記第１冷却水路４の途中にはヒータホース１１の一端が接続され、このヒータホース１１の他端は前記第３冷却水路８の途中に接続されている。前記ヒータホース１１の途中には、冷却水と室内暖房用空気との間で熱交換を行うヒータコア１２が配置されている。
【００３１】
ヒータホース１１におけるヒータコア１２と第３冷却水路８との接続部の間には第１バイパス通路１３ａの一端が接続され、この第１バイパス通路１３ａの他端は電動ウォーターポンプ１４の冷却水吸い込み口に接続されている。電動ウォーターポンプ１４の冷却水吐出口は第２バイパス通路１３ｂを介して蓄熱容器１５の冷却水入口１５ａに連通されている。蓄熱容器１５の冷却水出口１５ｂは、第３バイパス通路１３ｃと連通しており、このバイパス通路１３ｃは、ヒータホース１１におけるヒータコア１２と第１冷却水路４との間の部位に接続されている。
【００３２】
前記蓄熱容器１５は、冷却水を蓄熱状態で貯留する容器であり、冷却水入口１５ａから新規の冷却水が流入すると、それと入れ代わりにこの蓄熱容器１５内に貯留されていた冷却水を前記冷却水出口１５ｂから排出するよう構成されている（新規の冷却水が冷却水出口１５ｂから流入した場合は、貯留されていた冷却水は冷却水入口１５ａから排出される）。
【００３３】
前記電動ウォーターポンプ１４は、バッテリ４３の電力を駆動源とするウォーターポンプであり、冷却水吸込口から吸い込んだ冷却水を冷却水吐出口から吐出することによって冷却水の循環流を発生させる。
【００３４】
ここで、ヒータコア１２と第１冷却水路４との間に位置するヒータホース１１において、第３バイパス通路１３ｃの接続部位を基準にして第１冷却水路４側の部位を第１ヒータホース１１ａと称するとともに、ヒータコア１２側の部位を第２ヒータホース１１ｂと称するものとする。また、ヒータコア１２と第３冷却水路８との間に位置するヒータホース１１において、第１バイパス通路１３ａの接続部位を基準にしてヒータコア１２側の部位を第３ヒータホース１１ｃと称するとともに、第３冷却水路８側の部位を第４ヒータホース１１ｄと称するものとする。
【００３５】
前記第１ヒータホース１１ａと前記第２ヒータホース１１ｂと前記第３バイパス通路１３ｃとの接続部には、流路切換弁１６が設けられている。この流路切換弁１６は、前記３つの通路の内、何れか１つの通路を選択的に遮断、または、全ての通路を開放するよう構成されている。
【００３６】
第３バイパス通路１３ｃにおける蓄熱容器１５の冷却水出口１５ｂ近傍には、この冷却水出口１５ｂを流通する冷却水の温度に対応した電気信号を出力する第１水温センサ１７が取り付けられている。また、ヘッド側冷却水路２ａにおける第１冷却水路４との接続部位近傍には、ヘッド側冷却水路２ａ内を流れる冷却水の温度に対応した電気信号を出力する第２水温センサ１８が取り付けられている。
【００３７】
このように構成された冷却水循環系には、当該冷却水循環系の作動状態を制御するための電子制御ユニット（ＥＣＵ：Electronic Control Unit）３９が併設されている。
【００３８】
ＥＣＵ３９には、前述した第１水温センサ１７、第２水温センサ１８、及びバッテリ４３に加えて、車室内に設けられたイグニッションスイッチ４０、スタータスイッチ４１、及び室内暖房装置のスイッチ（ヒータスイッチ）４２が電気的に接続され、それらからの出力信号がＥＣＵ３９へ入力されるようになっている。
【００３９】
更に、ＥＣＵ３９は、前述した電動ウォーターポンプ１４及び流路切換弁１６と電気的に接続されており、ＥＣＵ３９によって電動ウォーターポンプ１４及び流路切換弁１６はその作動を制御される。
【００４０】
次に、本実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系における内燃機関１の始動前暖機時の冷却水循環経路について説明する。
【００４１】
図２は、本実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系における内燃機関１の始動前暖機時の冷却水循環経路を示す図である。
【００４２】
ＥＣＵ３９は、内燃機関１の始動前暖機時には第２ヒータホース１１ｂを遮断させるべく、流路切換弁１６を制御すると共に、電動ウォーターポンプ１４を作動させる。
【００４３】
この場合、第１ヒータホース１１ａと第３バイパス通路１３ｃとが連通するとともに、機械式ウォーターポンプ１０が作動せずに電動ウォーターポンプ１４のみが作動することになる。
【００４４】
従って、図２に示すような、電動ウォーターポンプ１４→第２バイパス通路１３ｂ→蓄熱容器１５→第３バイパス通路１３ｃ→流路切換弁１６→第１ヒータホース１１ａ→第１冷却水路４→ヘッド側冷却水路２ａ→ブロック側冷却水路２ｂ→機械式ウォーターポンプ１０→第３冷却水路８→第４ヒータホース１１ｄ→第１バイパス通路１３ａ→電動ウォーターポンプ１４の順に冷却水が流れる暖機回路３１が成立する。
【００４５】
暖機回路３１が成立すると、蓄熱容器１５内に貯留されていた高温の冷却水（以下、温水と称する）が、冷却水出口１５ｂから排出され、第３バイパス通路１３ｃ、流路切換弁１６、第１ヒータホース１１ａ、及び第１冷却水路４を介して内燃機関１のヘッド側冷却水路２ａへ流入する。
【００４６】
ヘッド側冷却水路２ａへ流入した温水は、次いでブロック側冷却水路２ｂへ流入することになり、流入した温水によってシリンダヘッド１ａおよびシリンダブロック１ｂが加熱され、内燃機関１の暖機が行われる。
【００４７】
次に、本実施の形態において、蓄熱容器１５の冷却水出口１５ｂ近傍に設置された第１水温センサ１７の異常を、内燃機関１の始動前暖機時に検出する暖機時水温センサ異常検出制御について説明する。
【００４８】
図３は、暖機時水温センサ異常検出制御ルーチンを示すフローチャート図である。本ルーチンは所定時間毎にＥＣＵ３９によって繰り返し実行される。
【００４９】
尚、内燃機関１のヘッド側冷却水路２ａに設けられた第２水温センサ１８については、以下に説明する暖機時水温センサ異常検出制御ルーチンとは異なる異常検出制御（例えば、内燃機関１が通常の運転状態にあるときに、第２水温センサ１８の検出値が予め定められた所定の温度範囲内にない場合、または、第２水温センサ１８の検出値が予め定められた所定時間の間、固定値であった場合、第２水温センサ１８の異常と判断する等の制御）によって異常検出が行われており、正常であるものとする。
【００５０】
本ルーチンでは、ＥＣＵ３９は、まずＳ１０１において内燃機関１の始動前暖機実行条件が成立したか否かを判別する。始動前暖機実行条件としては、内燃機関１の始動前において、第２水温センサ１８の検出値が予め定められた所定温度以下の場合等が例示できる。
【００５１】
前記Ｓ１０１において、内燃機関１の始動前暖機実行条件が成立していないと判定された場合、ＥＣＵ３９は、本ルーチンの実行を一旦終了する。
【００５２】
一方、前記Ｓ１０１において、内燃機関１の始動前暖機条件が成立したと判定された場合、ＥＣＵ３９は、Ｓ１０２に進み、第１水温センサ１７の暖機前検出値Ｔｓ１を読み込む。
【００５３】
次に、ＥＣＵ３９は、Ｓ１０３に進み、内燃機関１の暖機を開始する。即ち、上述した暖機回路３１が成立する。
【００５４】
前記Ｓ１０３において、内燃機関１の暖機を開始したＥＣＵ３９は、Ｓ１０４に進み、暖機開始から所定時間ｔ１が経過したか否かを判別する。
【００５５】
前記所定時間ｔ１は内燃機関1の暖機が開始されてから終了するまでの時間としてもよい。
【００５６】
前記Ｓ１０４において、内燃機関１の暖機開始後、所定時間ｔ１が経過していないと判定された場合、ＥＣＵ３９は、所定時間ｔ１が経過するまで前記Ｓ１０４を繰り返す。
【００５７】
一方、前記Ｓ１０４において、内燃機関１の暖機開始後、所定時間ｔ１が経過したと判定された場合、ＥＣＵ３９は、Ｓ１０５に進み、第１水温センサ１７の暖機後検出値Ｔｓ２を読み込む。
【００５８】
次に、ＥＣＵ３９は、Ｓ１０６に進み、前記Ｓ１０５において読み込んだ第１水温センサ１７の暖機後検出値Ｔｓ２が、前記Ｓ１０２において読み込んだ第１水温センサ１７の暖機前検出値Ｔｓ１に比べて高いか否かを判別する。
【００５９】
上述したように、暖機回路３１が形成されると、蓄熱タンク１５内に貯留されていた温水が、冷却水出口１５ｂから第３バイパス通路１３ｃへ流出する。そのため、図４に示すとおり、冷却水出口１５ｂには暖機前に比べて高い温度の冷却水が流通することになる。
【００６０】
従って、前記Ｓ１０６において、第１水温センサ１７の暖機後検出値Ｔｓ２が第１水温センサ１７の暖機前検出値Ｔｓ１以下と判定された場合、第１水温センサ１７は異常であると判断することができる。
【００６１】
そこで、前記Ｓ１０６において、第１水温センサ１７の暖機後検出値Ｔｓ２が、第１水温センサ１７の暖機前検出値Ｔｓ１以下と判定された場合、ＥＣＵ３９は、Ｓ１１０に進み、これら２つの検出値が略同等であるか否か判別する。
【００６２】
前記Ｓ１１０において、第１水温センサ１７の暖機前検出値Ｔｓ１と第１水温センサ１７の暖機後検出値Ｔｓ２とが略同等と判定された場合、ＥＣＵ３９は、Ｓ１１２に進み、第１水温センサ１７は、冷却水の温度が変化しても検出値が変化しない固着異常であると判断し、本ルーチンの実行を終了する。
【００６３】
一方、前記Ｓ１１０において、第１水温センサ１７の暖機前検出値Ｔｓ１と第１水温センサ１７の暖機後検出値Ｔｓ２とが略同等ではないと判定された場合、ＥＣＵ３９は、Ｓ１１１に進み、第１水温センサ１７は、冷却水の温度を正確に検出していない、即ち、異常であると判断し、本ルーチンの実行を終了する。
【００６４】
前記Ｓ１０６において、第１水温センサ１７の暖機後検出値Ｔｓ２が第１水温センサ１７の暖機前検出値Ｔｓ１より高いと判定された場合、ＥＣＵ３９は、Ｓ１０７に進み、第２水温センサ１８の暖機後検出値Ｔｅ１を読み込む。
【００６５】
次に、ＥＣＵ３９は、Ｓ１０８に進み、前記Ｓ１０５において読み込んだ第１水温センサの暖機後検出値Ｔｓ２が、前記Ｓ１０７において読み込んだ第２水温センサ１８の暖機後検出値Ｔｅ１より高いか否かを判別する。
【００６６】
上述したように、暖機回路３１が形成されると、蓄熱タンク１５に貯留された高温の冷却水がヘッド側冷却水路２ａに流入するため、ヘッド側冷却水路２ａを流通する冷却水の温度も暖機前に比べて高くなる。しかし、ヘッド側冷却水路２ａに流入する冷却水は、第３バイパス通路１３ｃ、及び第１ヒータホース１１ａ、第１冷却水路４を経由しており、また、内燃機関１のシリンダヘッド１ａ及びシリンダブロック１ｂを熱伝導によって加熱するため、図４に示すとおり、蓄熱タンク１５の冷却水出口１５ｂから流出した冷却水に比べて低い温度となる。
【００６７】
従って、前記Ｓ１０８において、第１水温センサ１７の暖機後検出値Ｔｓ２が第２水温センサ１８の暖機後検出値Ｔｅ１以下と判定された場合、第１水温センサ１７は異常であると判断することができる。
【００６８】
そこで、前記Ｓ１０８において、第１水温センサ１７の暖機後検出値Ｔｓ２が第２水温センサ１８の暖機後検出値Ｔｅ１以下と判定された場合、ＥＣＵ３９は、Ｓ１１１に進み、第１水温センサ１７は、冷却水の温度を正確に検出していない、即ち、異常であると判断し、本ルーチンの実行を終了する。
【００６９】
一方、前記Ｓ１０８において、第１水温センサ１７の暖機後検出値Ｔｓ２が第２水温センサ１８の暖機後検出値Ｔｅ１より高いと判定された場合、ＥＣＵ３９は、Ｓ１０９に進み、第１水温センサ１７は正常であると判断し、本ルーチンの実行を終了する。
【００７０】
（第２の実施の形態）
次に、本発明の第２の実施の形態について説明する。
本実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系の概略構成は上述した図１と同様である。以下、本実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系における蓄熱容器１５への温水回収時の冷却水循環経路について述べる。
【００７１】
図５は、本実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系における蓄熱容器１５への温水回収時の冷却水循環経路を示す図である。
【００７２】
内燃機関１の始動前暖機終了後は、流路切換弁１６によって、第３バイパス通路１３ｃが遮断されるとともに、電動ウォーターポンプ１４の作動が停止される。その後、内燃機関１は始動され、機械式ウォーターポンプ１０が作動し、冷却水は、ヘッド側冷却水路２ａ、ブロック側冷却水路２ｂ、ヒータホース１１等を循環するとともに、内燃機関１によって加熱される。このとき、バイパス通路１３ｃは遮断されているため、図４に示すとおり、バイパス通路１３ｃ、および蓄熱タンク１５に貯留されている冷却水の温度は時間の経過とともに低下する。
【００７３】
ＥＣＵ３９は、蓄熱容器１５への温水回収実行時には、内燃機関１の暖機終了後に遮断された第３バイパス通路１３ｃを開放させるべく、流路切換弁１６を制御する。
【００７４】
この場合、第１ヒータホース１１ａと第３バイパス通路１３ｃとが連通し、第３バイパス通路１３ｃ、および蓄熱タンク１５を冷却水が流通することになる。
【００７５】
従って、図５に示すような、機械式ウォーターポンプ１０→ブロック側冷却水路２ｂ→ヘッド側冷却水路２ａ→第１冷却水路４→第１ヒータホース１１ａ→流路切換弁１６→第３バイパス通路１３ｃ→蓄熱容器１５→第２バイパス通路１３ｂ→電動ウォーターポンプ１４→第１バイパス通路１３ａ→第４ヒータホース１１ｄ→第３冷却水路８→機械式ウォーターポンプ１０の順に冷却水が流れる温水回収回路３２が成立する。
【００７６】
温水回収回路３２が成立すると、内燃機関１によって加熱された温水が、第１冷却水路４、第１ヒータホース１１ａ、流路切換弁１６、および第３バイパス通路１３ｃを介して冷却水出口１５ｂから蓄熱容器１５内へ流入し、蓄熱容器１５内に貯留されていた冷却水が冷却水入口１５ａから第２バイパス通路１３ｂに排出される。そのため、蓄熱容器１５内には温水が貯留されることになる。
【００７７】
次に、本実施の形態において、蓄熱容器１５の冷却水出口１５ｂ近傍に設置された第１水温センサ１７の異常を、蓄熱タンク１５へ温水を回収する温水回収時に検出する温水回収時水温センサ異常検出制御について説明する。
【００７８】
図６は、温水回収時水温センサ異常検出制御ルーチンを示すフローチャート図である。本ルーチンは所定時間毎にＥＣＵ３９によって繰り返し実行される。
【００７９】
尚、本実施の形態においても、内燃機関１のヘッド側冷却水路２ａに設けられた第２水温センサ１８については、上述した第１の実施の形態と同様、正常であるものとする。
【００８０】
本ルーチンでは、まずＥＣＵ３９は、Ｓ２０１において蓄熱タンク１５への温水回収実行条件が成立したか否かを判別する。温水回収実行条件としては、例えば、内燃機関１の運転中において、第２水温センサ１８の検出値が予め定められた所定温度以上となった場合等が例示できる。
【００８１】
前記Ｓ２０１において、温水回収実行条件が成立していないと判定された場合、ＥＣＵ３９は、本ルーチンの実行を一旦終了する。
【００８２】
一方、前記Ｓ２０１において、温水回収実行条件が成立したと判定された場合、ＥＣＵ３９は、Ｓ２０２に進み、第１水温センサ１７の回収前検出値Ｔｓ３を読み込む。
【００８３】
次に、ＥＣＵ３９は、Ｓ２０３に進み、蓄熱タンク１５への温水回収を開始する。即ち、上述した温水回収回路３２が成立する。
【００８４】
前記Ｓ２０３において、蓄熱タンク１５への温水回収を開始したＥＣＵ３９は、Ｓ２０４に進み、回収開始から予め定められた所定時間ｔ２が経過したか否かを判別する。
【００８５】
前記所定時間ｔ２は、蓄熱タンク１５への温水回収が開始されてから冷却水出口１５ｂを流通する温水の温度が安定するまでの時間であり予め経験的または実験的に求められた時間である。
【００８６】
前記Ｓ２０４において、蓄熱タンク１５への温水回収開始後、所定時間ｔ２が経過していないと判定された場合、ＥＣＵ３９は、所定時間ｔ２が経過するまで前記Ｓ２０４を繰り返す。
【００８７】
一方、前記Ｓ２０４において、蓄熱タンク１５への温水回収開始後、所定時間ｔ２が経過したと判定された場合、ＥＣＵ３９は、Ｓ２０５に進み、第１水温センサ１７の回収後検出値Ｔｓ４を読み込む。
【００８８】
次に、ＥＣＵ３９は、Ｓ２０６に進み、前記Ｓ２０５において読み込んだ第１水温センサ１７の回収後検出値Ｔｓ４から前記Ｓ２０２において読み込んだ第１水温センサ１７の回収前検出値Ｔｓ３を減算することによって第１水温センサ検出値の回収前後温度差ΔＴｓ１を算出する。
【００８９】
前記Ｓ２０６において、回収前後温度差ΔＴｓ１を算出したＥＣＵ３９は、Ｓ２０７に進み、前記Ｓ２０６において算出した回収前後温度差ΔＴｓ１が予め定められた第１の所定温度差ΔＴｍ以上であるか否かを判定する。
【００９０】
上述したように、回収回路３２が形成されると、内燃機関１によって加熱された温水が、第３バイパス通路１３ｃを経由し冷却水出口１５ｂから蓄熱タンク１５内へ流入する。そのため、図４に示すとおり、冷却水出口１５ｂには温水回収前に比べて高い温度の冷却水が流通することになる。
【００９１】
従って、前記Ｓ２０７において、回収前後温度差ΔＴｓ１が第１の所定温度差ΔＴｍより小さいと判定された場合、第１水温センサ１７は異常であると判断することができる。
【００９２】
温水回収時に蓄熱タンク１５内へ流入する温水は、第１冷却水通路４と第１ヒータホース１１ａと第３バイパス通路１３ｃとを経由しているため、途中での放熱によって、ヘッド側冷却水路２ａを流通している温水と比較して若干低い温度となる（図４参照）。前記第１の所定温度差ΔＴｍは、温水回収によって、前記所定時間ｔ２経過後に生ずべき冷却水の温度差であり、前記したような放熱による温度低下や、エンジンルーム内温度等の環境条件、さらに、第１水温センサ１７および第２水温センサ１８の出力の公差等を加味して、実験的に求められた値である。
【００９３】
前記Ｓ２０７において、回収前後温度差ΔＴｓ１が第１の所定温度差ΔＴｍより小さいと判定された場合、ＥＣＵ３９は、Ｓ２１１に進み、この回収前後温度差ΔＴｓ１が略０であるか否か判別する。
【００９４】
前記Ｓ２１１において、回収前後温度差ΔＴｓ１が略０であると判定された場合、ＥＣＵ３９は、Ｓ１１２に進み、第１水温センサ１７は、冷却水の温度が変化しても検出値が変化しない固着異常であると判断し、本ルーチンの実行を終了する。
【００９５】
一方、前記Ｓ２１１において、回収前後温度差ΔＴｓ１が略０ではないと判定された場合、ＥＣＵ３９は、Ｓ１１１に進み、第１水温センサ１７は、冷却水の温度を正確に検出していない、即ち、異常であると判断し、本ルーチンの実行を終了する。
【００９６】
前記Ｓ２０７において、回収前後温度差ΔＴｓ１が第１の所定温度差ΔＴｍ以上と判定された場合、ＥＣＵ３９は、Ｓ２０８に進み、第２水温センサ１８の回収後検出値Ｔｅ２を読み込む。
【００９７】
次に、ＥＣＵ３９は、Ｓ２０９に進み、前記Ｓ２０８において読み込まれた第２水温センサ１８の回収後検出値Ｔｅ２から前記Ｓ２０５において読み込まれた第１水温センサ１７の回収後検出値Ｔｓ４を減算することによって回収後温度差ΔＴｅｓ１を算出する。
【００９８】
前記Ｓ２０９において、回収後温度差ΔＴｅｓ１を算出したＥＣＵ３９は、Ｓ２１０に進み、前記Ｓ２０９において算出した回収後温度差ΔＴｅｓ１が、０以上、且つ、予め定められた第２の所定温度差ΔＴｎ以下であるか否かを判定する。
【００９９】
上述したように、回収回路３２が形成されると、内燃機関１によって加熱された温水が、第３バイパス通路１３ｃを介し冷却水出口１５ｂから蓄熱タンク１５内へ流入する。そのため、図４に示すとおり、温水回収開始から所定時間ｔ２が経過した後には、冷却水出口１５ｂを流通する温水の温度は、内燃機関１を流通する温水の温度と略同等となる。しかしながら、蓄熱タンク１５へ流入する温水は、第１冷却水路４、および第１ヒータホース１１ａ、第３バイパス通路１３ｃを経由しているため、図４に示すとおり、途中での放熱によって、内燃機関１を流通する温水に比べて若干低い温度となる。
【０１００】
従って、前記Ｓ２１０において、回収後温度差ΔＴｅｓ１が、０より小さい、または、第２の所定温度差ΔＴｎより大きいと判定された場合、第１水温センサ１７は異常であると判断することができる。
【０１０１】
前記第２の所定温度差ΔＴｎは、上述したような、第１冷却水通路４と第１ヒータホース１１ａと第３バイパス通路１３ｃとにおける放熱によって生ずる冷却水の温度差であり、第１水温センサ１７および第２水温センサ１８の出力公差等を加味して、実験的に求められた値である。
【０１０２】
そこで、前記Ｓ２１０において、回収後温度差ΔＴｅｓ１が、０より小さい、または、第２の所定温度差ΔＴｎより大きいと判定された場合、ＥＣＵ３９は、Ｓ１１１に進み、第１水温センサ１７は、冷却水の温度を正確に検出していない、即ち、異常であると判断し、本ルーチンの実行を終了する。
【０１０３】
一方、前記Ｓ２１０において、回収後温度差ΔＴｅｓ１が、０以上、且つ、第２の所定温度差ΔＴｎ以下であると判定された場合、ＥＣＵ３９は、Ｓ１０９に進み、第１水温センサ１７は正常であると判断し、本ルーチンの実行を終了する。
【０１０４】
（第３の実施の形態）
次に、本発明の第３の実施の形態について説明する。
本実施の形態に係る内燃機関の蓄熱装置を含んだ冷却水循環系の概略構成は上述した図１と同様である。以下、本実施の形態において、内燃機関１の温度が予め定められた所定温度よりも高く、且つ第１ヒータホース１１ａと第３バイパス通路が連通した状態で、内燃機関１が始動した時に、蓄熱容器１５の冷却水出口１５ｂ近傍に設置された第１水温センサ１７の異常を検出する温間始動時水温センサ異常検出制御について述べる。
【０１０５】
図７は、温間始動時水温センサ異常検出制御ルーチンを示すフローチャート図である。本ルーチンは所定時間毎にＥＣＵ３９によって繰り返し実行される。
【０１０６】
尚、本実施の形態においても、内燃機関１のヘッド側冷却水路２ａに設けられた第２水温センサ１８については、上述した第１の実施の形態と同様、正常であるものとする。
【０１０７】
本ルーチンでは、ますＥＣＵ３９は、Ｓ３０１において、内燃機関１が始動したか否かを判別する。
【０１０８】
前記Ｓ３０１において、内燃機関１は始動していないと判定された場合、ＥＣＵ３９は、本ルーチンの実行を一旦終了する。
【０１０９】
一方、前記Ｓ３０１において、内燃機関１が始動したと判定された場合、ＥＣＵ３９は、Ｓ３０２に進み、第２水温センサ１８の始動時検出値Ｔｅ３を読み込む。
【０１１０】
次に、ＥＣＵ３９は、Ｓ３０３に進み、前記Ｓ３０２において読み込んだ第２水温センサ１８の始動前検出値Ｔｅ３が予め定められた所定温度Ｔｅｍ以上であるか否かを判別する。尚、この所定温度Ｔｅｍは内燃機関１の始動前暖機が不要となる温度としてもよい。
【０１１１】
前記Ｓ３０３において、第２水温センサ１８の始動前検出値Ｔｅ３が所定温度Ｔｅｍより低いと判定された場合、ＥＣＵ３９は、本ルーチンの実行を一旦終了する。
【０１１２】
一方、前記Ｓ３０３において、第２水温センサ１８の始動前検出値Ｔｅ３が所定温度Ｔｅｍ以上と判定された場合、ＥＣＵ３９は、Ｓ３０４に進み、流路切換弁１６の制御状態から、第１ヒータホース１１ａと第３バイパス通路１３ｃとが連通しているか否かを判別する。
【０１１３】
前記Ｓ３０４において、第１ヒータホース１１ａと第３バイパス通路１３ｃとが連通していないと判定された場合、ＥＣＵ３９は、本ルーチンの実行を一旦終了する。
【０１１４】
一方、前記Ｓ３０４において、第１ヒータホース１１ａと第３バイパス通路１３ｃとが連通していると判定された場合、ＥＣＵ３９は、Ｓ３０５に進み、第１水温センサ１７の始動時検出値Ｔｓ５を読み込む。
【０１１５】
次に、ＥＣＵ３９は、Ｓ３０６に進み、第３バイパス通路１３ｃを遮断すべく流路切換弁１６を制御する。
【０１１６】
前記Ｓ３０６において、第３バイパス通路１３ｃを遮断したＥＣＵ３９は、Ｓ３０７に進み、第３バイパス通路１３ｃを遮断した後、予め定められた所定時間ｔ３が経過したか否かを判別する。
【０１１７】
前記Ｓ３０７において、第３バイパス通路１３ｃを遮断した後、所定時間ｔ３が経過していないと判定された場合、ＥＣＵ３９は、所定時間ｔ３が経過するまで前記Ｓ３０７を繰り返す。
【０１１８】
一方、前記Ｓ３０７において、第３バイパス通路１３ｃを遮断した後、所定時間ｔ３が経過したと判断された場合、ＥＣＵ３９は、Ｓ３０８に進み、第１水温センサ１７の通路遮断後検出値Ｔｓ６を読み込む。
【０１１９】
次に、ＥＣＵ３９は、Ｓ３０９に進み、前記Ｓ３０５において読み込んだ第１水温センサ１７の始動時検出値Ｔｓ５から前記Ｓ３０８おいて読み込んだ第１水温センサ１７の通路遮断後検出値Ｔｓ６を減算して第１水温センサ検出値の遮断前後温度差ΔＴｓ２を算出する。
【０１２０】
前記Ｓ３０９において、遮断前後温度差ΔＴｓ２を算出したＥＣＵ３９は、Ｓ３１０に進み、前記Ｓ３０９において算出した遮断前後温度差ΔＴｓ２が、予め定められた第３の所定温度差ΔＴｐ以上であるか否かを判定する。
【０１２１】
本実施の形態に係る内燃機関の蓄熱装置を備えた冷却水循環系において、内燃機関１が始動される時に、第３バイパス通路１３ｃが遮断されると、始動した内燃機関１によって加熱された温水は第３バイパス通路には流入しないため、図８に示すとおり蓄熱タンク１５の冷却水出口１５ｂ近傍の冷却水温度は、放熱によって時間の経過とともに低下する。
【０１２２】
従って、前記Ｓ３０９において算出された遮断前後温度差ΔＴｓ２が第３の所定温度差ΔＴｐより小さいと判定された場合、第１水温センサ１７は異常であると判断することができる。
【０１２３】
前記所定時間ｔ３は、第３バイパス通路１３ｃが遮断されてから、冷却水出口１５ｂ近傍の冷却水の温度が低下することによって、第１水温センサ１７の異常判定が可能となる温度差が生じるまでの時間であり、予め実験的に求められた時間である。また、前記第３の所定温度差ΔＴｐは、第３バイパス通路１３ｃが遮断されることによって、前記所定時間ｔ３経過後に生ずべき冷却水の温度差であり、エンジンルーム内温度等の環境条件、さらに、第１水温センサ１７および第２水温センサ１８の出力の公差等を加味して、予め実験的に求められた値である。
【０１２４】
そこで、前記Ｓ３１０において、遮断前後温度差ΔＴｓ２が第３の所定温度差ΔＴｐより小さいと判定された場合、ＥＣＵ３９は、Ｓ３１１に進み、該遮断前後温度差ΔＴｓ２が略０であるか否か判別する。
【０１２５】
前記Ｓ３１１において、遮断前後温度差ΔＴｓ２が、略０であると判定された場合、ＥＣＵ３９は、Ｓ１１２に進み、第１水温センサ１７は、冷却水の温度が変化しても検出値が変化しない固着異常であると判断し、本ルーチンの実行を終了する。
【０１２６】
一方、前記Ｓ３１１において、遮断前後温度差ΔＴｓ２が、略０ではないと判定された場合、ＥＣＵ３９は、Ｓ１１１に進み、第１水温センサ１７は、冷却水の温度を正確に検出していない、即ち、異常であると判断し、本ルーチンの実行を終了する。
【０１２７】
前記Ｓ３１０において、遮断前後温度差ΔＴｓ２が、第３の所定温度差ΔＴｐ以上と判定された場合、ＥＣＵ３９は、Ｓ１０９に進み、第１水温センサ１７は正常であると判断し、本ルーチンの実行を終了する。
【０１２８】
【発明の効果】
本発明に係る内燃機関の蓄熱装置によれば、蓄熱容器と内燃機関とを経由して熱媒体が循環する熱媒体通路において、熱媒体の流れに沿って上流側と下流側とに設けられた少なくとも２つの温度検出手段のうち、一方の温度検出手段の検出値と正常とされる他方の温度検出手段の検出値とを比較する。その結果、両者の相互関係が、予め求められた所定の相互関係と異なる場合、一方の温度検出手段の異常と判断することができ、温度検出手段の異常を検出することが可能となる。
【図面の簡単な説明】
【図１】 本発明に係る内燃機関の蓄熱装置を含んだ冷却水循環系を示す概略構成図
【図２】 本発明に係る内燃機関の蓄熱装置を含んだ冷却水循環系における内燃機関１の始動前暖機時の冷却水循環経路を示す図
【図３】 暖機時水温センサ異常検出制御ルーチンを示すフローチャート図
【図４】 本発明に係る内燃機関の蓄熱装置における、蓄熱タンク１５の冷却水出口１５ｂを流通する冷却水の温度と内燃機関１を流通する冷却水の温度との変化を示す第1の図
【図５】 本発明に係る内燃機関の蓄熱装置を含んだ冷却水循環系における蓄熱タンク１５への温水回収時の冷却水循環経路を示す図
【図６】 温水回収時水温センサ異常検出制御ルーチンを示すフローチャート図
【図７】 温間始動時水温センサ異常検出制御ルーチンを示すフローチャート図
【図８】 本発明に係る内燃機関の蓄熱装置における、蓄熱タンク１５の冷却水出口１５ｂを流通する冷却水の温度と内燃機関１を流通する冷却水の温度との変化を示す第２の図
【符号の説明】
１・・・・内燃機関
１ａ・・・シリンダヘッド
１ｂ・・・シリンダブロック
２ａ・・・ヘッド側冷却水路
２ｂ・・・ブロック側冷却水路
４・・・・第１冷却水路
５・・・・ラジエター
６・・・・第２冷却水路
７・・・・サーモスタットバルブ
８・・・・第３冷却水路
９・・・・バイパス水路
１０・・・機械式ウォーターポンプ
１１ａ・・第１ヒータホース
１１ｂ・・第２ヒータホース
１１ｃ・・第３ヒータホース
１１ｄ・・第４ヒータホース
１２・・・ヒータコア
１３ａ・・第１バイパス通路
１３ｂ・・第２バイパス通路
１３ｃ・・第３バイパス通路
１４・・・電動ウォーターポンプ
１５・・・蓄熱容器
１５ａ・・冷却水入口
１５ｂ・・冷却水出口
１６・・・流路切換弁
１７・・・第１水温センサ
１８・・・第２水温センサ
３１・・・暖機回路
３２・・・温水回収回路
３９・・・ＥＣＵ
４０・・・イグニッションスイッチ
４１・・・スタータスイッチ
４２・・・ヒータスイッチ
４３・・・バッテリ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat storage device for an internal combustion engine that stores a heat medium such as cooling water in a heat storage state and supplies the stored heat medium to the internal combustion engine or the like in accordance with an operating state or temperature of the internal combustion engine.
[0002]
[Prior art]
2. Description of the Related Art In recent years, internal combustion engines mounted on automobiles and the like store a heat medium such as cooling water in a heat storage state for the purpose of improving cold startability, combustion stability, exhaust emission, or indoor heating performance. A heat storage device that includes a heat storage container in a heat medium passage, stores a high-temperature heat medium in the heat storage container, and supplies the stored heat medium to the internal combustion engine or the like according to an operating state or temperature of the internal combustion engine or the like. Proposed.
[0003]
In the heat storage device for an internal combustion engine as described above, it is important to diagnose occurrence of an abnormality due to a failure of a heat storage container, a heat medium passage, or the like.
[0004]
As a failure diagnosis device such as a heat storage container or a heat medium passage in a conventional heat storage device for an internal combustion engine, for example, a cooling water temperature detecting means for detecting the temperature of the cooling water in the internal combustion engine is provided, and the cooling water temperature is detected when the internal combustion engine is stopped. The heat storage water temperature in the heat storage container when the internal combustion engine is stopped is estimated from the cooling water temperature detected by the detection means, the estimated heat storage water temperature when the internal combustion engine is stopped, and the elapsed time since the internal combustion engine is stopped, The heat storage water temperature at the time of restarting the internal combustion engine is estimated based on the above, and the warmed-up water temperature at the time of restarting the internal combustion engine is sufficiently high despite the estimated heat storage water temperature at the time of restarting the internal combustion engine. A failure diagnosing device for a thermal control system for an internal combustion engine for diagnosing a failure of the heat storage container including the cooling water passage when an increasing rate of the cooling water temperature is lower than a predetermined value set in advance; A heat storage water temperature detection means for detecting the temperature of the heat storage water in the heat storage container, the heat storage water temperature detected by the heat storage water temperature detection means when the internal combustion engine is stopped, the elapsed time from the stop of the internal combustion engine, and the internal combustion When the decrease rate of the heat storage water temperature calculated based on the heat storage water temperature detected by the heat storage water temperature detecting means at the time of engine restart exceeds a predetermined value set in advance, it is diagnosed as a failure of the heat storage container. A failure diagnosis device for a thermal control system for an internal combustion engine is known (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
JP-A-11-182307
[0006]
[Problems to be solved by the invention]
By the way, in the heat storage device of the internal combustion engine, when an abnormality occurs in the temperature detection means for detecting the temperature of the heat medium such as cooling water, the internal combustion engine or the like is stored in the heat medium stored in the heat storage container according to the operating state or temperature. In addition, it is difficult to supply the gas to the heat exchanger properly, and failure diagnosis of the heat medium passage and the heat storage container as described above cannot be performed accurately.
[0007]
Therefore, the present invention has been made in view of the above circumstances, and stores a heat medium such as cooling water in a heat storage state, and stores the heat medium depending on the operating state or temperature of the internal combustion engine or the like. An object of the present invention is to provide a technique capable of detecting an abnormality of a temperature detecting means for detecting the temperature of the heat medium in an internal combustion engine including a heat storage container for supplying the heat to the internal combustion engine or the like.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
That is, the internal combustion engine heat storage device according to the present invention is:
A heat storage container for storing the heat medium in a heat storage state;
A heat medium passage through which the heat medium circulates via the heat storage container and the internal combustion engine;
In the heat medium passage, provided at the upstream side and the downstream side along the flow of the heat medium, at least two temperature detection means for detecting the temperature of the heat medium;
When the internal combustion engine is in a predetermined operating state, an abnormality of the one temperature detecting means is detected by comparing the output value of one of the temperature detecting means with the output value of the other temperature detecting means. Determining means for determining
It is good also as a structure provided with.
[0009]
The present invention provides at least an upstream side and a downstream side along the flow of the heat medium in the heat medium passage through which the heat medium circulates via the heat storage container and the internal combustion engine, and detects at least the temperature of the heat medium. By comparing the output value of one of the two temperature detection means and the output value of the other temperature detection means when the internal combustion engine is in a predetermined operating state, the abnormality of one temperature detection means The greatest feature is to detect.
[0010]
The interrelationship between the temperature of the upstream heat medium and the temperature of the downstream heat medium in the heat medium passage when the internal combustion engine is in a predetermined operating state can be obtained in advance by experiment or experience.
[0011]
Therefore, in the heat storage device for an internal combustion engine according to the present invention, the other temperature detection means is normal among at least two temperature detection means provided on the upstream side and the downstream side of the heat medium passage, and the internal combustion engine Is in a predetermined operating state, if the correlation between the detection value of one temperature detection means and the detection value of the other temperature detection means is different from the predetermined correlation obtained in advance, one of the temperature detection means Judge as abnormal.
[0012]
In the heat storage device for an internal combustion engine according to the present invention, the temperature detection means includes at least the heat storage container side temperature detection means for detecting the temperature of the heat medium entering and exiting the heat storage container and the internal combustion engine for detecting the temperature of the heat medium flowing through the internal combustion engine. It is good also as a structure which has an engine side temperature detection means.
[0013]
In this case, with respect to the internal combustion engine side temperature detection means, for example, during operation of the internal combustion engine, the detected value of the internal combustion engine side temperature detection means is not within a predetermined temperature range that is predetermined according to the operating state of the internal combustion engine. In this case, or when it is a fixed value for a predetermined time, it is possible to detect an abnormality such as determining that the internal combustion engine side temperature detecting means is abnormal. Therefore, in the present invention, the internal combustion engine side temperature detection means is normal, and by comparing the detection value of the heat storage container side temperature detection means with the detection value of the internal combustion engine side temperature detection means, the heat storage container side temperature detection means Judge abnormalities.
[0014]
For example, when the internal combustion engine is warmed up, if a detection value of the heat storage container side temperature detection means is lower than a detection value of the internal combustion engine side temperature detection means after a predetermined time has elapsed since the start of warming up, the determination means detects the heat storage container side temperature. It may be determined that the means is abnormal.
[0015]
When the internal combustion engine is warmed up, the high-temperature heat medium stored in the heat storage container flows into the internal combustion engine through the heat medium passage. At this time, the heat medium flowing into the internal combustion engine passes through the heat medium passage, and the internal combustion engine is heated by heat conduction. Therefore, the temperature is lower than immediately after flowing out of the heat storage container. Therefore, if both the internal combustion engine side temperature detection means and the heat storage container side temperature detection means are normal, the detected value of the heat storage container side temperature detection means after the elapse of a predetermined time from the start of warming up of the internal combustion engine is the internal combustion engine side temperature detection means. Higher than the detected value.
[0016]
That is, in the heat storage device for an internal combustion engine according to the present invention, if the detection value of the heat storage container side temperature detection means is lower than the detection value of the internal combustion engine side temperature detection means after a predetermined time has elapsed from the start of warming up of the internal combustion engine, the determination means Determines that the heat storage container side temperature detection means is abnormal.
[0017]
Further, for example, when a high-temperature heat medium is recovered in the heat storage container, the difference between the detection value of the heat storage container side temperature detection means and the detection value of the internal combustion engine side temperature detection means is a predetermined value after a predetermined time has elapsed since the start of recovery. In the case described above, the determination unit may determine that the heat storage container side temperature detection unit is abnormal.
[0018]
When a high-temperature heat medium is collected in the heat storage container, the heat medium heated by the internal combustion engine flows into the heat storage container through the heat medium passage. Therefore, if both the internal combustion engine side temperature detection means and the heat storage container side temperature detection means are normal, the detection value of the heat storage container side temperature detection means will be the value of the internal combustion engine side temperature detection means after the elapse of a predetermined time from the start of heat medium recovery. It is almost the same as the detected value.
[0019]
That is, in the heat storage device for an internal combustion engine according to the present invention, after a predetermined time has elapsed since the start of recovery of the high-temperature heat medium into the heat storage container, the detection value of the heat storage container side temperature detection means and the detection value of the internal combustion engine side temperature detection means When the difference is greater than or equal to a predetermined value, the determining means determines that the heat storage container side temperature detecting means is abnormal.
[0020]
The internal combustion engine heat storage device according to the present invention further includes a heat medium circulation means for circulating the heat medium in the heat medium passage and / or a heat medium circulation stop means for stopping the circulation of the heat medium in the heat medium passage, The means determines whether the heat storage container side temperature detection means is abnormal after a lapse of a predetermined time from when the heat medium circulation is started by the heat medium circulation means and / or when the heat medium circulation is stopped by the heat medium circulation stop means. You may do that.
[0021]
This is because the temperature of the heat medium entering and exiting the heat storage container and the temperature of the heat medium flowing through the internal combustion engine change before and after the start or stop of circulation of the heat medium, and after a predetermined time has elapsed, This is because the temperature reaches a temperature at which abnormality determination is possible.
[0022]
For example, the difference between the detection value of the heat storage container side temperature detection means when the circulation of the heat medium is started and the detection value of the heat storage container side temperature detection means after a predetermined time has elapsed since the start of circulation of the heat medium is When the value is equal to or less than the predetermined value, it may be determined that the heat storage container side temperature detection means is abnormal.
[0023]
Further, for example, the detection value of the heat storage container side temperature detection means when the circulation of the heat medium is stopped and the detection value of the heat storage container side temperature detection means after a lapse of a predetermined time from when the circulation of the heat medium is stopped. When the difference is equal to or less than a predetermined value, it may be determined that the heat storage container side temperature detection means is abnormal.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of a heat storage device for an internal combustion engine according to the present invention will be described with reference to the drawings.
[0025]
(First embodiment)
FIG. 1 is a schematic configuration diagram showing a cooling water circulation system including a heat storage device for an internal combustion engine according to a first embodiment of the present invention.
[0026]
The internal combustion engine 1 includes a cylinder head 1a and a cylinder block 1b. Each of the cylinder head 1a and the cylinder block 1b is formed with a head side cooling water channel 2a and a block side cooling water channel 2b for circulating cooling water as a heat medium according to the present invention, and the head side cooling water channel 2a. And the block-side cooling water channel 2b communicate with each other.
[0027]
A first cooling water channel 4 is connected to the head side cooling water channel 2 a, and the first cooling water channel 4 is connected to a cooling water inlet of the radiator 5. A cooling water outlet of the radiator 5 is connected to a thermostat valve 7 via a second cooling water channel 6.
[0028]
In addition to the second cooling water channel 6, a third cooling water channel 8 and a bypass water channel 9 are connected to the thermostat valve 7. The third cooling water channel 8 is connected to a suction port of a mechanical water pump 10 using a rotational torque of the engine output shaft (crankshaft) of the internal combustion engine 1 as a drive source, and the bypass water channel 9 is connected to the head side cooling water channel 2a. It is connected.
[0029]
The block-side cooling water channel 2 b is connected to the discharge port of the mechanical water pump 10.
[0030]
One end of the heater hose 11 is connected in the middle of the first cooling water channel 4, and the other end of the heater hose 11 is connected in the middle of the third cooling water channel 8. In the middle of the heater hose 11, a heater core 12 for exchanging heat between the cooling water and the air for indoor heating is disposed.
[0031]
One end of the first bypass passage 13 a is connected between the heater core 12 and the third cooling water passage 8 in the heater hose 11, and the other end of the first bypass passage 13 a is the cooling water suction port of the electric water pump 14. It is connected to the. The cooling water discharge port of the electric water pump 14 is communicated with the cooling water inlet 15a of the heat storage container 15 through the second bypass passage 13b. The cooling water outlet 15 b of the heat storage container 15 communicates with the third bypass passage 13 c, and this bypass passage 13 c is connected to a portion of the heater hose 11 between the heater core 12 and the first cooling water passage 4.
[0032]
The heat storage container 15 is a container for storing cooling water in a heat storage state. When new cooling water flows from the cooling water inlet 15a, the cooling water stored in the heat storage container 15 is replaced with the cooling water. It is configured to discharge from the outlet 15b (when new cooling water flows from the cooling water outlet 15b, the stored cooling water is discharged from the cooling water inlet 15a).
[0033]
The electric water pump 14 is a water pump that uses the power of the battery 43 as a drive source, and generates a circulating flow of cooling water by discharging the cooling water sucked from the cooling water suction port from the cooling water discharge port.
[0034]
Here, in the heater hose 11 positioned between the heater core 12 and the first cooling water passage 4, a portion on the first cooling water passage 4 side is referred to as a first heater hose 11a with reference to a connection portion of the third bypass passage 13c. A portion on the heater core 12 side is referred to as a second heater hose 11b. In addition, in the heater hose 11 located between the heater core 12 and the third cooling water passage 8, the portion on the heater core 12 side with reference to the connection portion of the first bypass passage 13a is referred to as a third heater hose 11c, and the third A portion on the cooling water channel 8 side is referred to as a fourth heater hose 11d.
[0035]
A flow path switching valve 16 is provided at a connection portion between the first heater hose 11a, the second heater hose 11b, and the third bypass passage 13c. The flow path switching valve 16 is configured to selectively block any one of the three paths or open all the paths.
[0036]
Near the cooling water outlet 15b of the heat storage container 15 in the third bypass passage 13c, a first water temperature sensor 17 that outputs an electric signal corresponding to the temperature of the cooling water flowing through the cooling water outlet 15b is attached. Further, a second water temperature sensor 18 that outputs an electric signal corresponding to the temperature of the cooling water flowing in the head side cooling water channel 2a is attached in the vicinity of the connection portion of the head side cooling water channel 2a with the first cooling water channel 4. Yes.
[0037]
The thus configured cooling water circulation system is provided with an electronic control unit (ECU: Electronic Control Unit) 39 for controlling the operating state of the cooling water circulation system.
[0038]
In addition to the first water temperature sensor 17, the second water temperature sensor 18, and the battery 43, the ECU 39 includes an ignition switch 40, a starter switch 41, and a switch (heater switch) 42 for the indoor heating device. Are electrically connected, and an output signal from them is input to the ECU 39.
[0039]
Further, the ECU 39 is electrically connected to the electric water pump 14 and the flow path switching valve 16 described above, and the operation of the electric water pump 14 and the flow path switching valve 16 is controlled by the ECU 39.
[0040]
Next, the cooling water circulation path when the internal combustion engine 1 is warmed up before starting in the cooling water circulation system including the heat storage device for the internal combustion engine according to the present embodiment will be described.
[0041]
FIG. 2 is a diagram showing a cooling water circulation path when the internal combustion engine 1 is warmed up before starting in the cooling water circulation system including the heat storage device for the internal combustion engine according to the present embodiment.
[0042]
The ECU 39 controls the flow path switching valve 16 and activates the electric water pump 14 so as to shut off the second heater hose 11b when the internal combustion engine 1 is warmed up before starting.
[0043]
In this case, the first heater hose 11a and the third bypass passage 13c communicate with each other, and only the electric water pump 14 operates without the mechanical water pump 10 operating.
[0044]
Therefore, as shown in FIG. 2, the electric water pump 14, the second bypass passage 13b, the heat storage container 15, the third bypass passage 13c, the flow switching valve 16, the first heater hose 11a, the first cooling water passage 4, and the head side. A warm-up circuit 31 in which cooling water flows is formed in the order of the cooling water channel 2a → the block-side cooling water channel 2b → the mechanical water pump 10 → the third cooling water channel 8 → the fourth heater hose 11d → the first bypass passage 13a → the electric water pump 14. To do.
[0045]
When the warm-up circuit 31 is established, the high-temperature cooling water (hereinafter referred to as hot water) stored in the heat storage container 15 is discharged from the cooling water outlet 15b, and the third bypass passage 13c, the flow path switching valve 16, It flows into the head side cooling water passage 2 a of the internal combustion engine 1 through the first heater hose 11 a and the first cooling water passage 4.
[0046]
The hot water that has flowed into the head-side cooling water passage 2a then flows into the block-side cooling water passage 2b, and the cylinder head 1a and the cylinder block 1b are heated by the hot water that has flowed in, so that the internal combustion engine 1 is warmed up.
[0047]
Next, in the present embodiment, a warm-up water temperature sensor abnormality detection control for detecting an abnormality of the first water temperature sensor 17 installed in the vicinity of the cooling water outlet 15b of the heat storage container 15 at the time of warming up before the internal combustion engine 1 is started. Will be described.
[0048]
FIG. 3 is a flowchart showing a warm-up water temperature sensor abnormality detection control routine. This routine is repeatedly executed by the ECU 39 every predetermined time.
[0049]
Incidentally, the second water temperature sensor 18 provided in the head side cooling water passage 2a of the internal combustion engine 1 is different from the warm-up water temperature sensor abnormality detection control routine described below (for example, the internal combustion engine 1 is normally used). When the detected value of the second water temperature sensor 18 is not within a predetermined temperature range determined during the operation state, or the detected value of the second water temperature sensor 18 is determined for a predetermined time. If it is a fixed value, it is assumed that the abnormality is detected by the control of determining that the second water temperature sensor 18 is abnormal, etc., and is normal.
[0050]
In this routine, the ECU 39 first determines whether or not the pre-start warm-up execution condition for the internal combustion engine 1 is satisfied in S101. Examples of the warm-up execution condition before starting include a case where the detected value of the second water temperature sensor 18 is equal to or lower than a predetermined temperature before starting the internal combustion engine 1.
[0051]
If it is determined in S101 that the pre-start-up warm-up execution condition for the internal combustion engine 1 is not satisfied, the ECU 39 once ends the execution of this routine.
[0052]
On the other hand, when it is determined in S101 that the pre-start-up warm-up condition for the internal combustion engine 1 is satisfied, the ECU 39 proceeds to S102 and reads the pre-warm-up detection value Ts1 of the first water temperature sensor 17.
[0053]
Next, the ECU 39 proceeds to S103 and starts warming up the internal combustion engine 1. That is, the warm-up circuit 31 described above is established.
[0054]
In S103, the ECU 39 that has started warming up of the internal combustion engine 1 proceeds to S104, and determines whether or not a predetermined time t1 has elapsed from the start of warming up.
[0055]
The predetermined time t1 may be a time from the start of warm-up of the internal combustion engine 1 to the end thereof.
[0056]
If it is determined in S104 that the predetermined time t1 has not elapsed after the start of warm-up of the internal combustion engine 1, the ECU 39 repeats S104 until the predetermined time t1 has elapsed.
[0057]
On the other hand, if it is determined in S104 that the predetermined time t1 has elapsed after the start of warming-up of the internal combustion engine 1, the ECU 39 proceeds to S105 and reads the detected value Ts2 after warm-up of the first water temperature sensor 17.
[0058]
Next, the ECU 39 proceeds to S106, and the detection value Ts2 after warm-up of the first water temperature sensor 17 read in S105 is higher than the detection value Ts1 before warm-up of the first water temperature sensor 17 read in S102. It is determined whether or not.
[0059]
As described above, when the warm-up circuit 31 is formed, the hot water stored in the heat storage tank 15 flows out from the cooling water outlet 15b to the third bypass passage 13c. Therefore, as shown in FIG. 4, cooling water having a higher temperature flows through the cooling water outlet 15b than before the warm-up.
[0060]
Therefore, when it is determined in S106 that the detection value Ts2 after warming-up of the first water temperature sensor 17 is equal to or less than the detection value Ts1 before warming-up of the first water temperature sensor 17, it is determined that the first water temperature sensor 17 is abnormal. be able to.
[0061]
Therefore, when it is determined in S106 that the detection value Ts2 after warming-up of the first water temperature sensor 17 is equal to or less than the detection value Ts1 before warming-up of the first water temperature sensor 17, the ECU 39 proceeds to S110 and detects these two detections. It is determined whether or not the values are substantially equal.
[0062]
If it is determined in S110 that the detected value Ts1 before warming up of the first water temperature sensor 17 and the detected value Ts2 after warming up of the first water temperature sensor 17 are substantially equal, the ECU 39 proceeds to S112 and proceeds to the first water temperature sensor. No. 17 determines that there is a sticking abnormality in which the detected value does not change even if the temperature of the cooling water changes, and ends the execution of this routine.
[0063]
On the other hand, if it is determined in S110 that the pre-warm detection value Ts1 of the first water temperature sensor 17 and the post-warm detection value Ts2 of the first water temperature sensor 17 are not substantially equal, the ECU 39 proceeds to S111. The first water temperature sensor 17 determines that the temperature of the cooling water is not accurately detected, that is, is abnormal, and ends the execution of this routine.
[0064]
When it is determined in S106 that the detected value Ts2 after warming up of the first water temperature sensor 17 is higher than the detected value Ts1 before warming up of the first water temperature sensor 17, the ECU 39 proceeds to S107 and the second water temperature sensor 18 The detection value Te1 after warm-up is read.
[0065]
Next, the ECU 39 proceeds to S108 and determines whether or not the post-warm detection value Ts2 of the first water temperature sensor read in S105 is higher than the post-warm detection value Te1 of the second water temperature sensor 18 read in S107. Is determined.
[0066]
As described above, when the warm-up circuit 31 is formed, the high-temperature cooling water stored in the heat storage tank 15 flows into the head-side cooling water channel 2a, so the temperature of the cooling water flowing through the head-side cooling water channel 2a is also Higher than before warming up. However, the cooling water flowing into the head side cooling water passage 2a passes through the third bypass passage 13c, the first heater hose 11a, and the first cooling water passage 4, and the cylinder head 1a and the cylinder block of the internal combustion engine 1 Since 1b is heated by heat conduction, the temperature is lower than that of the cooling water flowing out from the cooling water outlet 15b of the heat storage tank 15, as shown in FIG.
[0067]
Therefore, when it is determined in S108 that the detected value Ts2 after warming up of the first water temperature sensor 17 is equal to or lower than the detected value Te1 after warming up of the second water temperature sensor 18, it is determined that the first water temperature sensor 17 is abnormal. be able to.
[0068]
Therefore, when it is determined in S108 that the detected value Ts2 after warming-up of the first water temperature sensor 17 is equal to or less than the detected value Te1 after warming-up of the second water temperature sensor 18, the ECU 39 proceeds to S111, and the first water temperature sensor 17 Determines that the temperature of the cooling water is not accurately detected, that is, it is abnormal, and ends the execution of this routine.
[0069]
On the other hand, if it is determined in S108 that the detected value Ts2 after warming up of the first water temperature sensor 17 is higher than the detected value Te1 after warming up of the second water temperature sensor 18, the ECU 39 proceeds to S109 and proceeds to the first water temperature sensor. 17 is determined to be normal, and the execution of this routine is terminated.
[0070]
(Second Embodiment)
Next, a second embodiment of the present invention will be described.
The schematic configuration of the cooling water circulation system including the heat storage device for the internal combustion engine according to the present embodiment is the same as that shown in FIG. Hereinafter, a cooling water circulation path at the time of collecting hot water to the heat storage container 15 in the cooling water circulation system including the heat storage device for the internal combustion engine according to the present embodiment will be described.
[0071]
FIG. 5 is a diagram showing a cooling water circulation path during hot water recovery to the heat storage container 15 in the cooling water circulation system including the heat storage device for the internal combustion engine according to the present embodiment.
[0072]
After the warm-up before starting of the internal combustion engine 1, the third bypass passage 13c is blocked by the flow path switching valve 16, and the operation of the electric water pump 14 is stopped. Thereafter, the internal combustion engine 1 is started, the mechanical water pump 10 is operated, and the cooling water circulates through the head side cooling water passage 2a, the block side cooling water passage 2b, the heater hose 11, and the like and is heated by the internal combustion engine 1. . At this time, since the bypass passage 13c is blocked, the temperature of the cooling water stored in the bypass passage 13c and the heat storage tank 15 decreases as time passes, as shown in FIG.
[0073]
The ECU 39 controls the flow path switching valve 16 so as to open the third bypass passage 13c that is shut off after the warm-up of the internal combustion engine 1 is completed when the hot water is collected into the heat storage container 15.
[0074]
In this case, the first heater hose 11a and the third bypass passage 13c communicate with each other, and the cooling water flows through the third bypass passage 13c and the heat storage tank 15.
[0075]
Therefore, as shown in FIG. 5, mechanical water pump 10 → block side cooling water channel 2b → head side cooling water channel 2a → first cooling water channel 4 → first heater hose 11a → channel switching valve 16 → third bypass channel 13c. The hot water recovery circuit 32 through which the cooling water flows is in the order of the heat storage container 15 → the second bypass passage 13 b → the electric water pump 14 → the first bypass passage 13 a → the fourth heater hose 11 d → the third cooling water passage 8 → the mechanical water pump 10. To establish.
[0076]
When the hot water recovery circuit 32 is established, the hot water heated by the internal combustion engine 1 flows from the cooling water outlet 15b via the first cooling water passage 4, the first heater hose 11a, the flow passage switching valve 16, and the third bypass passage 13c. The cooling water that has flowed into the heat storage container 15 and stored in the heat storage container 15 is discharged from the cooling water inlet 15a to the second bypass passage 13b. Therefore, warm water is stored in the heat storage container 15.
[0077]
Next, in the present embodiment, an abnormality of the first water temperature sensor 17 installed in the vicinity of the cooling water outlet 15b of the heat storage container 15 detects an abnormality in the water temperature sensor at the time of hot water recovery that is detected at the time of hot water recovery for recovering the hot water to the heat storage tank 15. The detection control will be described.
[0078]
FIG. 6 is a flowchart showing a water temperature sensor abnormality detection control routine during hot water recovery. This routine is repeatedly executed by the ECU 39 every predetermined time.
[0079]
In the present embodiment as well, the second water temperature sensor 18 provided in the head side cooling water passage 2a of the internal combustion engine 1 is assumed to be normal as in the first embodiment.
[0080]
In this routine, the ECU 39 first determines whether or not the conditions for executing the hot water recovery to the heat storage tank 15 are satisfied in S201. Examples of the hot water recovery execution condition include a case where the detected value of the second water temperature sensor 18 is equal to or higher than a predetermined temperature during operation of the internal combustion engine 1.
[0081]
If it is determined in S201 that the hot water recovery execution condition is not satisfied, the ECU 39 once ends the execution of this routine.
[0082]
On the other hand, if it is determined in S201 that the hot water recovery execution condition is satisfied, the ECU 39 proceeds to S202 and reads the detection value Ts3 before recovery of the first water temperature sensor 17.
[0083]
Next, the ECU 39 proceeds to S203 and starts collecting hot water to the heat storage tank 15. That is, the above-described hot water recovery circuit 32 is established.
[0084]
In S203, the ECU 39 that has started collecting hot water to the heat storage tank 15 proceeds to S204, and determines whether or not a predetermined time t2 has elapsed since the start of collection.
[0085]
The predetermined time t2 is a time from the start of hot water recovery to the heat storage tank 15 to the stabilization of the temperature of the hot water flowing through the cooling water outlet 15b, and is a time determined empirically or experimentally in advance.
[0086]
When it is determined in S204 that the predetermined time t2 has not elapsed after the hot water recovery to the heat storage tank 15 is started, the ECU 39 repeats S204 until the predetermined time t2 has elapsed.
[0087]
On the other hand, if it is determined in S204 that the predetermined time t2 has elapsed after the hot water recovery to the heat storage tank 15 is started, the ECU 39 proceeds to S205 and reads the post-recovery detection value Ts4 of the first water temperature sensor 17.
[0088]
Next, the ECU 39 proceeds to S206, and subtracts the pre-recovery detection value Ts3 of the first water temperature sensor 17 read in S202 from the post-recovery detection value Ts4 of the first water temperature sensor 17 read in S205. A temperature difference ΔTs1 before and after recovery of the water temperature sensor detection value is calculated.
[0089]
In S206, the ECU 39 having calculated the temperature difference ΔTs1 before and after the recovery proceeds to S207, and determines whether or not the temperature difference ΔTs1 before and after the recovery calculated in S206 is equal to or greater than a predetermined first predetermined temperature difference ΔTm. .
[0090]
As described above, when the recovery circuit 32 is formed, the hot water heated by the internal combustion engine 1 flows into the heat storage tank 15 from the cooling water outlet 15b via the third bypass passage 13c. Therefore, as shown in FIG. 4, the cooling water having a higher temperature flows through the cooling water outlet 15b than before the recovery of the hot water.
[0091]
Therefore, when it is determined in S207 that the temperature difference ΔTs1 before and after recovery is smaller than the first predetermined temperature difference ΔTm, it can be determined that the first water temperature sensor 17 is abnormal.
[0092]
Since the hot water flowing into the heat storage tank 15 during the hot water recovery passes through the first cooling water passage 4, the first heater hose 11a, and the third bypass passage 13c, the head side cooling water passage 2a is radiated in the middle. The temperature is slightly lower than that of the hot water circulating in the water (see FIG. 4). The first predetermined temperature difference ΔTm is a temperature difference of cooling water that should be generated after the predetermined time t2 has elapsed due to the hot water recovery, and environmental conditions such as a temperature decrease due to heat dissipation and an engine room temperature as described above, Furthermore, it is a value obtained experimentally by taking into account the tolerances of the outputs of the first water temperature sensor 17 and the second water temperature sensor 18.
[0093]
When it is determined in S207 that the temperature difference ΔTs1 before and after recovery is smaller than the first predetermined temperature difference ΔTm, the ECU 39 proceeds to S211 and determines whether or not the temperature difference ΔTs1 before and after recovery is substantially zero.
[0094]
If it is determined in S211 that the temperature difference ΔTs1 before and after recovery is substantially 0, the ECU 39 proceeds to S112, and the first water temperature sensor 17 causes the sticking abnormality in which the detected value does not change even if the temperature of the cooling water changes. And the execution of this routine is terminated.
[0095]
On the other hand, if it is determined in S211 that the temperature difference ΔTs1 before and after recovery is not substantially 0, the ECU 39 proceeds to S111, and the first water temperature sensor 17 does not accurately detect the temperature of the cooling water, that is, It is determined that there is an abnormality, and the execution of this routine is terminated.
[0096]
When it is determined in S207 that the temperature difference ΔTs1 before and after recovery is equal to or greater than the first predetermined temperature difference ΔTm, the ECU 39 proceeds to S208 and reads the post-recovery detection value Te2 of the second water temperature sensor 18.
[0097]
Next, the ECU 39 proceeds to S209, and subtracts the post-recovery detection value Ts4 of the first water temperature sensor 17 read in S205 from the post-recovery detection value Te2 of the second water temperature sensor 18 read in S208. A post-recovery temperature difference ΔTes1 is calculated.
[0098]
In S209, the ECU 39 that calculated the post-recovery temperature difference ΔTes1 proceeds to S210, and the post-recovery temperature difference ΔTes1 calculated in S209 is not less than 0 and not more than a predetermined second predetermined temperature difference ΔTn. It is determined whether or not.
[0099]
As described above, when the recovery circuit 32 is formed, the hot water heated by the internal combustion engine 1 flows into the heat storage tank 15 from the cooling water outlet 15b through the third bypass passage 13c. Therefore, as shown in FIG. 4, the temperature of the hot water flowing through the cooling water outlet 15 b becomes substantially equal to the temperature of the hot water flowing through the internal combustion engine 1 after a predetermined time t <b> 2 has elapsed since the start of hot water recovery. However, since the warm water flowing into the heat storage tank 15 passes through the first cooling water passage 4, the first heater hose 11a, and the third bypass passage 13c, as shown in FIG. The temperature is slightly lower than that of the hot water flowing through 1.
[0100]
Therefore, when it is determined in S210 that the post-recovery temperature difference ΔTes1 is smaller than 0 or larger than the second predetermined temperature difference ΔTn, it can be determined that the first water temperature sensor 17 is abnormal.
[0101]
The second predetermined temperature difference ΔTn is a temperature difference of the cooling water generated by heat radiation in the first cooling water passage 4, the first heater hose 11a, and the third bypass passage 13c as described above, and the first water temperature sensor. 17 and a value obtained experimentally by taking into account output tolerances of the second water temperature sensor 18 and the like.
[0102]
Therefore, when it is determined in S210 that the post-recovery temperature difference ΔTes1 is smaller than 0 or larger than the second predetermined temperature difference ΔTn, the ECU 39 proceeds to S111, and the first water temperature sensor 17 Is not accurately detected, that is, it is determined to be abnormal, and the execution of this routine is terminated.
[0103]
On the other hand, if it is determined in S210 that the post-recovery temperature difference ΔTes1 is not less than 0 and not more than the second predetermined temperature difference ΔTn, the ECU 39 proceeds to S109 and the first water temperature sensor 17 is normal. This routine is terminated.
[0104]
(Third embodiment)
Next, a third embodiment of the present invention will be described.
The schematic configuration of the cooling water circulation system including the heat storage device for the internal combustion engine according to the present embodiment is the same as that shown in FIG. Hereinafter, in the present embodiment, when the internal combustion engine 1 is started in a state where the temperature of the internal combustion engine 1 is higher than a predetermined temperature and the first heater hose 11a communicates with the third bypass passage, A warm-up water temperature sensor abnormality detection control for detecting an abnormality of the first water temperature sensor 17 installed in the vicinity of the cooling water outlet 15b of the container 15 will be described.
[0105]
FIG. 7 is a flowchart showing a water temperature sensor abnormality detection control routine during warm start. This routine is repeatedly executed by the ECU 39 every predetermined time.
[0106]
In the present embodiment as well, the second water temperature sensor 18 provided in the head side cooling water passage 2a of the internal combustion engine 1 is assumed to be normal as in the first embodiment.
[0107]
In this routine, the ECU 39 determines in S301 whether or not the internal combustion engine 1 has been started.
[0108]
When it is determined in S301 that the internal combustion engine 1 has not been started, the ECU 39 once ends the execution of this routine.
[0109]
On the other hand, if it is determined in S301 that the internal combustion engine 1 has been started, the ECU 39 proceeds to S302 and reads the startup detection value Te3 of the second water temperature sensor 18.
[0110]
Next, the ECU 39 proceeds to S303, and determines whether or not the detection value Te3 before starting the second water temperature sensor 18 read in S302 is equal to or higher than a predetermined temperature Tem. The predetermined temperature Tem may be a temperature at which the internal combustion engine 1 does not need to be warmed up before starting.
[0111]
If it is determined in S303 that the pre-start detection value Te3 of the second water temperature sensor 18 is lower than the predetermined temperature Tem, the ECU 39 once ends the execution of this routine.
[0112]
On the other hand, when it is determined in S303 that the detected value Te3 before start of the second water temperature sensor 18 is equal to or higher than the predetermined temperature Tem, the ECU 39 proceeds to S304, and from the control state of the flow path switching valve 16, the first heater hose 11a. And whether or not the third bypass passage 13c is in communication.
[0113]
If it is determined in S304 that the first heater hose 11a and the third bypass passage 13c are not in communication, the ECU 39 once ends the execution of this routine.
[0114]
On the other hand, if it is determined in S304 that the first heater hose 11a and the third bypass passage 13c are in communication, the ECU 39 proceeds to S305 and reads the detected value Ts5 at the time of starting the first water temperature sensor 17.
[0115]
Next, the ECU 39 proceeds to S306 and controls the flow path switching valve 16 to block the third bypass passage 13c.
[0116]
In S306, the ECU 39 that shuts off the third bypass passage 13c proceeds to S307, and after shutting off the third bypass passage 13c, determines whether or not a predetermined time period t3 has elapsed.
[0117]
If it is determined in S307 that the predetermined time t3 has not elapsed after the third bypass passage 13c is blocked, the ECU 39 repeats S307 until the predetermined time t3 has elapsed.
[0118]
On the other hand, if it is determined in S307 that the predetermined time t3 has elapsed after the third bypass passage 13c is blocked, the ECU 39 proceeds to S308 and reads the detected value Ts6 after the passage of the first water temperature sensor 17 is cut off.
[0119]
Next, the ECU 39 proceeds to S309, and subtracts the detection value Ts6 after passage cutoff of the first water temperature sensor 17 read in S308 from the start time detection value Ts5 of the first water temperature sensor 17 read in S305. 1 A temperature difference ΔTs2 before and after the shutoff of the water temperature sensor detection value is calculated.
[0120]
In step S309, the ECU 39 having calculated the temperature difference ΔTs2 before and after the interruption proceeds to step S310, and determines whether or not the temperature difference ΔTs2 before and after the interruption calculated in step S309 is greater than or equal to a predetermined third predetermined temperature difference ΔTp. To do.
[0121]
In the cooling water circulation system provided with the heat storage device for the internal combustion engine according to the present embodiment, when the third bypass passage 13c is shut off when the internal combustion engine 1 is started, the hot water heated by the started internal combustion engine 1 is Since it does not flow into the third bypass passage, the cooling water temperature in the vicinity of the cooling water outlet 15b of the heat storage tank 15 decreases with the passage of time as shown in FIG.
[0122]
Therefore, when it is determined that the temperature difference ΔTs2 before and after the interruption calculated in S309 is smaller than the third predetermined temperature difference ΔTp, it can be determined that the first water temperature sensor 17 is abnormal.
[0123]
During the predetermined time t3, after the third bypass passage 13c is shut off, the temperature of the cooling water in the vicinity of the cooling water outlet 15b decreases until a temperature difference that allows the abnormality determination of the first water temperature sensor 17 occurs. This time is experimentally determined in advance. Further, the third predetermined temperature difference ΔTp is a temperature difference of cooling water to be generated after the predetermined time t3 has elapsed by blocking the third bypass passage 13c, and environmental conditions such as an engine room temperature, Furthermore, it is a value obtained experimentally in advance, taking into account the tolerances of the outputs of the first water temperature sensor 17 and the second water temperature sensor 18.
[0124]
Therefore, when it is determined in S310 that the temperature difference ΔTs2 before and after the interruption is smaller than the third predetermined temperature difference ΔTp, the ECU 39 proceeds to S311 and determines whether or not the temperature difference ΔTs2 before and after the interruption is substantially zero. .
[0125]
If it is determined in S311 that the temperature difference ΔTs2 before and after shut-off is approximately 0, the ECU 39 proceeds to S112, and the first water temperature sensor 17 is fixed so that the detected value does not change even if the temperature of the cooling water changes. It is determined that there is an abnormality, and the execution of this routine is terminated.
[0126]
On the other hand, if it is determined in S311 that the temperature difference ΔTs2 before and after shut-off is not substantially 0, the ECU 39 proceeds to S111, and the first water temperature sensor 17 does not accurately detect the temperature of the cooling water, that is, Therefore, it is determined that there is an abnormality, and the execution of this routine is terminated.
[0127]
If it is determined in S310 that the temperature difference ΔTs2 before and after the shutoff is equal to or greater than the third predetermined temperature difference ΔTp, the ECU 39 proceeds to S109, determines that the first water temperature sensor 17 is normal, and executes this routine. finish.
[0128]
【The invention's effect】
According to the heat storage device for an internal combustion engine according to the present invention, the heat medium passage in which the heat medium circulates via the heat storage container and the internal combustion engine is provided on the upstream side and the downstream side along the flow of the heat medium. Of at least two temperature detection means, the detection value of one temperature detection means is compared with the detection value of the other temperature detection means that is normal. As a result, when the mutual relationship between the two is different from the predetermined mutual relationship obtained in advance, it can be determined that one of the temperature detection means is abnormal, and the abnormality of the temperature detection means can be detected.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a cooling water circulation system including a heat storage device for an internal combustion engine according to the present invention.
FIG. 2 is a view showing a cooling water circulation path when the internal combustion engine 1 is warmed up before starting in a cooling water circulation system including the heat storage device for the internal combustion engine according to the present invention.
FIG. 3 is a flowchart showing a warm-up water temperature sensor abnormality detection control routine.
4 is a first diagram showing changes in the temperature of cooling water flowing through the cooling water outlet 15b of the heat storage tank 15 and the temperature of cooling water flowing through the internal combustion engine 1 in the heat storage device for the internal combustion engine according to the present invention. FIG.
FIG. 5 is a diagram showing a cooling water circulation path when collecting hot water to the heat storage tank 15 in a cooling water circulation system including a heat storage device for an internal combustion engine according to the present invention.
FIG. 6 is a flowchart showing a water temperature sensor abnormality detection control routine during hot water recovery.
FIG. 7 is a flowchart showing a water temperature sensor abnormality detection control routine during warm start.
FIG. 8 is a second diagram showing changes in the temperature of the cooling water flowing through the cooling water outlet 15b of the heat storage tank 15 and the temperature of the cooling water flowing through the internal combustion engine 1 in the heat storage device for the internal combustion engine according to the present invention.
[Explanation of symbols]
1 ... Internal combustion engine
1a ... Cylinder head
1b ... Cylinder block
2a: Head side cooling water channel
2b Block side cooling water channel
4 ... 1st cooling water channel
5 ... Radiator
6 ... Second cooling water channel
7. Thermostat valve
8 ... 3rd cooling water channel
9 ... Bypass waterway
10 ... Mechanical water pump
11a..First heater hose
11b ... Second heater hose
11c ··· Third heater hose
11d · · 4th heater hose
12 ... Heater core
13a 1st bypass passage
13b ... Second bypass passage
13c 3rd bypass passage
14 ... Electric water pump
15 ... Thermal storage container
15a ... Cooling water inlet
15b ... Cooling water outlet
16 ... Flow path switching valve
17 ... 1st water temperature sensor
18 ... Second water temperature sensor
31 ... Warm-up circuit
32 ... Hot water recovery circuit
39 ... ECU
40 ... Ignition switch
41 ... Starter switch
42 ... Heater switch
43 ... Battery

Claims (7)

熱媒体を蓄熱状態で貯留する蓄熱容器と、
前記蓄熱容器と内燃機関とを経由して前記熱媒体が循環する熱媒体通路と、
前記蓄熱容器に出入りする前記熱媒体の温度を検出する蓄熱容器側温度検出手段と、
前記内燃機関を流通する前記熱媒体の温度を検出する内燃機関側温度検出手段と、
前記蓄熱容器及び前記内燃機関の一方から他方へ高温の前記熱媒体が前記熱媒体通路を介して移動するときに前記蓄熱容器側温度検出手段の異常を判定する判定手段と、を備え、
前記判定手段は、
前記蓄熱容器及び前記内燃機関の一方から他方への高温の前記熱媒体の移動が開始される前と該熱媒体の移動が開始された時から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等である場合、前記蓄熱容器側温度検出手段が前記熱媒体の温度が変化してもその検出値が変化しない固着異常であると判定し、
前記蓄熱容器及び前記内燃機関の一方から他方への高温の前記熱媒体の移動が開始される前と該熱媒体の移動が開始された時から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該熱媒体の移動が開始された時から所定時間経過後において前記蓄熱容器側温度検出手段の検出値と前記内燃機関側温度検出手段の検出値とが所定の関係にあるときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする内燃機関の蓄熱装置。A heat storage container for storing the heat medium in a heat storage state;
A heat medium passage through which the heat medium circulates via the heat storage container and the internal combustion engine;
Heat storage container side temperature detection means for detecting the temperature of the heat medium entering and exiting the heat storage container;
An internal combustion engine side temperature detecting means for detecting a temperature of the heat medium flowing through the internal combustion engine;
And a determination means for determining abnormality of the heat storage container side temperature detecting means when the heat storage vessel and the high temperature of the heating medium from one to the other of said internal combustion engine is moved through the heat medium passage,
The determination means includes
The heat storage container side temperature detection means before the start of the movement of the high temperature heat medium from one of the heat storage container and the internal combustion engine to the other and after the lapse of a predetermined time from the start of the movement of the heat medium. If the detected value is substantially equivalent, the heat storage container side temperature detecting means determines that the detected value does not change even if the temperature of the heat medium changes, and is a sticking abnormality,
The heat storage container side temperature detection means before the start of the movement of the high temperature heat medium from one of the heat storage container and the internal combustion engine to the other and after the lapse of a predetermined time from the start of the movement of the heat medium. If the detected values of the heat storage container side temperature detecting means and the detected value of the internal combustion engine side temperature detecting means after a lapse of a predetermined time from the start of the movement of the heat medium When it is in a predetermined relationship, it is determined that the heat storage container side temperature detecting means is abnormal that the temperature of the heat medium is not accurately detected . 前記判定手段は、
前記蓄熱容器に貯留された高温の前記熱媒体を前記熱媒体通路を介して前記内燃機関に供給する前記内燃機関の暖機時に前記蓄熱容器側温度検出手段の異常を判定するものであって、
前記内燃機関の暖機開始前と該暖機開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等である場合、前記蓄熱容器側温度検出手段が前記熱媒体の温度が変化してもその検出値が変化しない固着異常であると判定し、
前記内燃機関の暖機開始前と該暖機開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該暖機開始から所定時間経過後において前記蓄熱容器側温度検出手段の検出値が前記内燃機関側温度検出手段の検出値以下のときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする請求項１記載の内燃機関の蓄熱装置。 The determination means includes
Be one that determines an abnormality of the heat storage container side temperature detection means during warm-up of the internal combustion engine to be supplied to the internal combustion engine via the front Stories heat medium passage hot the heat medium stored in the heat storage container ,
When the detected value of the heat storage container side temperature detection means before the start of warming up of the internal combustion engine and after a predetermined time has elapsed since the start of warming up are substantially equal, the temperature of the heat storage container side temperature detection means is the temperature of the heat medium. It is determined that it is a sticking abnormality that does not change the detected value even if changes,
If the detected value of the heat storage container side temperature detecting means in and after a predetermined time has elapsed from the warm-up before the start該暖machine start of the internal combustion engine is not substantially equal, the heat storage after the predetermined time has passed from the warm-up starts When the detection value of the container side temperature detection means is equal to or less than the detection value of the internal combustion engine side temperature detection means, it is determined that the heat storage container side temperature detection means is not detecting the temperature of the heat medium accurately. The heat storage device for an internal combustion engine according to claim 1 . 前記判定手段は、
前記内燃機関によって加熱された高温の前記熱媒体を前記熱媒体通路を介して前記蓄熱容器に回収する熱媒体回収時に前記蓄熱容器側温度検出手段の異常を判定するものであって、
前記蓄熱容器への熱媒体回収開始前と該熱媒体回収開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等である場合、前記蓄熱容器側温度検出手段が前記熱媒体の温度が変化してもその検出値が変化しない固着異常であると判定し、
前記蓄熱容器への熱媒回収開始前と該熱媒体回収開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該熱媒体回収開始から所定時間経過後において前記蓄熱容器側温度検出手段の検出値と前記内燃機関側温度検出手段の検出値との差が所定値より大きいときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする請求項１または２記載の内燃機関の蓄熱装置。 The determination means includes
Be one that determines an abnormality of the heat storage container side temperature detecting means when the heat medium collecting for collecting the thermal storage vessel via a pre Symbol heat medium passage the heat medium of the high-temperature heated by the internal combustion engine,
When the detection values of the heat storage container side temperature detection means before the start of heat medium recovery to the heat storage container and after a predetermined time has elapsed since the heat medium recovery start are approximately equal, the heat storage container side temperature detection means Judging that the detected value does not change even if the temperature of the medium changes, it is a sticking abnormality,
If the detected values of the heat storage container side temperature detection means before the start of heat medium recovery to the heat storage container and after a predetermined time have elapsed since the heat medium recovery start are not substantially equal, a predetermined time has elapsed from the start of the heat medium recovery wherein when the difference between the detected value of the detection value and the internal combustion engine side temperature detecting means of the heat storage container side temperature detection means is larger than a predetermined value, accurately the temperature of the heat storage container side temperature detecting means the heating medium after 3. The heat storage device for an internal combustion engine according to claim 1, wherein it is determined that the abnormality is not detected . 前記判定手段は、
前記内燃機関によって加熱された高温の前記熱媒体を前記熱媒体通路を介して前記蓄熱容器に回収する熱媒体回収時に前記蓄熱容器側温度検出手段の異常を判定するものであっ て、
前記蓄熱容器への熱媒回収開始前と該熱媒体回収開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等である場合、前記蓄熱容器側温度検出手段が前記熱媒体の温度が変化してもその検出値が変化しない固着異常であると判定し、
前記蓄熱容器への熱媒回収開始前と該熱媒体回収開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該熱媒体回収開始から所定時間経過後において前記蓄熱容器側温度検出手段の検出値が前記内燃機関側温度検出手段の検出値より高いときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする請求項１または２に記載の内燃機関の蓄熱装置。 The determination means includes
Determining the abnormality of the heat storage container-side temperature detecting means during heat medium recovery for recovering the high-temperature heat medium heated by the internal combustion engine to the heat storage container via the heat medium passage ;
When the detected values of the heat storage container side temperature detection means before the start of heat medium recovery to the heat storage container and after a predetermined time has elapsed since the heat medium recovery start are substantially equal, the heat storage container side temperature detection means Judging that the detected value does not change even if the temperature of the medium changes, it is a sticking abnormality,
If the detected values of the heat storage container side temperature detection means before the start of heat medium recovery to the heat storage container and after a predetermined time have elapsed since the heat medium recovery start are not substantially equal, a predetermined time has elapsed from the start of the heat medium recovery When the detection value of the heat storage container side temperature detection means is higher than the detection value of the internal combustion engine side temperature detection means later, it is an abnormality that the heat storage container side temperature detection means does not accurately detect the temperature of the heat medium. The heat storage device for an internal combustion engine according to claim 1, wherein the heat storage device is determined to be present . 前記判定手段は、The determination means includes
前記蓄熱容器及び前記内燃機関の一方から他方への高温の前記熱媒体の移動が開始される前と該熱媒体の移動が開始された時から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該熱媒体の移動が開始される前の前記蓄熱容器側温度検出手段の検出値と該熱媒体の移動が開始された時から所定時間経過後の前記蓄熱容器側温度検出手段の検出値との差が所定値より小さいときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする請求項１から４のいずれかに記載の内燃機関の蓄熱装置。The heat storage container side temperature detection means before the start of the movement of the high temperature heat medium from one of the heat storage container and the internal combustion engine to the other and after the lapse of a predetermined time from the start of the movement of the heat medium. When the detection value of the heat storage container side temperature detection means before the movement of the heat medium is started and the movement value after the predetermined time has elapsed from when the movement of the heat medium is started When the difference from the detection value of the heat storage container side temperature detection means is smaller than a predetermined value, it is determined that the heat storage container side temperature detection means is abnormal that the temperature of the heat medium is not accurately detected. The heat storage device for an internal combustion engine according to any one of claims 1 to 4. 前記判定手段は、The determination means includes
前記内燃機関の暖機開始前と該暖機開始から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該暖機開始前の前記蓄熱容器側温度検出手段の検出値よりも該暖機開始から所定時間経過後の前記蓄熱容器側温度検出手段の検出値が低いときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする請求項２記載の内燃機関の蓄熱装置。When the detected value of the heat storage container side temperature detecting means before the start of warming up of the internal combustion engine and after a predetermined time has elapsed after the start of warming up are not substantially equal, the temperature detection of the heat storage container side before the start of warming up When the detection value of the heat storage container side temperature detection means after the elapse of a predetermined time from the start of warm-up is lower than the detection value of the means, the heat storage container side temperature detection means accurately detects the temperature of the heat medium. 3. The heat storage device for an internal combustion engine according to claim 2, wherein it is determined that there is no abnormality. 前記判定手段は、The determination means includes
さらに、前記熱媒体通路を介しての前記蓄熱容器及び前記内燃機関の一方から他方へ高温の前記熱媒体の移動が停止したときに前記蓄熱容器側温度検出手段の異常を判定するものであって、Further, when the movement of the high temperature heat medium from one of the heat storage container and the internal combustion engine to the other through the heat medium passage is stopped, an abnormality of the heat storage container side temperature detecting means is determined. ,
前記蓄熱容器及び前記内燃機関の一方から他方への高温の熱媒体の移動が停止される前と該熱媒体の移動が停止された時から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等である場合、前記蓄熱容器側温度検出手段が前記熱媒体の温度が変化してもその検出値が変化しない固着異常であると判定し、The temperature of the heat storage container-side temperature detection means before the movement of the high-temperature heat medium from one of the heat storage container and the internal combustion engine to the other is stopped and after a predetermined time has elapsed since the movement of the heat medium was stopped. If the detected values are substantially equal, the heat storage container side temperature detecting means determines that the detected value does not change even if the temperature of the heat medium changes, and is a sticking abnormality,
前記蓄熱容器及び前記内燃機関の一方から他方への高温の前記熱媒体の移動が停止される前と該熱媒体の移動が停止された時から所定時間経過後とにおける前記蓄熱容器側温度検出手段の検出値が略同等ではない場合に、該熱媒体の移動が停止される前の前記蓄熱容器側温度検出手段の検出値と該熱媒体の移動が停止された時から所定時間経過後の前記蓄熱容器側温度検出手段の検出値との差が所定値より小さいときは、前記蓄熱容器側温度検出手段が前記熱媒体の温度を正確に検出していない異常であると判定することを特徴とする請求項１から６のいずれかに記載の内燃機関の蓄熱装置。The heat storage container side temperature detection means before the movement of the high temperature heat medium from one of the heat storage container and the internal combustion engine to the other is stopped and after a predetermined time has elapsed since the movement of the heat medium was stopped. When the detection value of the heat storage container side temperature detection means before the movement of the heat medium is stopped and the movement value after the predetermined time has elapsed, When the difference from the detection value of the heat storage container side temperature detection means is smaller than a predetermined value, it is determined that the heat storage container side temperature detection means is abnormal that the temperature of the heat medium is not accurately detected. The heat storage device for an internal combustion engine according to any one of claims 1 to 6.
JP2002356986A 2002-12-09 2002-12-09 Heat storage device for internal combustion engine Expired - Fee Related JP4075594B2 (en)

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