JP5973146B2 - Abnormality diagnosis device for hydraulic variable valve device - Google Patents
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Description
本発明は、内燃機関の油圧式可変バルブ装置の異常診断装置に関するものである。 The present invention relates to an abnormality diagnosis device for a hydraulic variable valve device for an internal combustion engine.
従来より、内燃機関の回転速度等の運転状態に応じて最適にバルブの開閉タイミングを変化させ得るようにした所謂可変バルブ機構（可変バルブ装置）が各種提案されている。 Conventionally, various so-called variable valve mechanisms (variable valve devices) have been proposed in which the valve opening / closing timing can be optimally changed in accordance with the operating state such as the rotational speed of the internal combustion engine.
このような可変バルブ機構の可変機構の駆動源として、油圧を利用するものがある。
例えば、特許文献１に記載される油圧式可変バルブ機構装置は、図５に示すように、内燃機関（エンジン）の気筒（シリンダ）１、燃焼室２、バルブ３（図中には吸気弁を図示）、ブリッジ４、吸気通路５、排気通路６、カムシャフト７を含んで構成されている。
As a drive source of such a variable valve mechanism, there is one that uses hydraulic pressure.
For example, as shown in FIG. 5, a hydraulic variable valve mechanism device described in Patent Document 1 includes a cylinder (cylinder) 1, a combustion chamber 2, and a valve 3 (in the drawing, an intake valve is not provided). And a bridge 4, an intake passage 5, an exhaust passage 6, and a camshaft 7.
カムシャフト７には、各気筒１に対応して吸気用と排気用のカム８（図中では吸気用のカムを図示）が並設されており、前記カムシャフト７の近傍を平行に延びるロッカーシャフト９には、前記カム８により一端をローラ１０ａを介し押し上げられて揺動するロッカーアーム１０が備えられている。 The camshaft 7 is provided with an intake cam 8 and an exhaust cam 8 (the intake cam is shown in the drawing) corresponding to each cylinder 1, and a rocker extending in the vicinity of the camshaft 7 in parallel. The shaft 9 is provided with a rocker arm 10 that swings by being pushed up by the cam 8 through a roller 10a.
このロッカーアーム１０の一端が上方の油圧ユニット１１に備えられたマスターピストン１２を押し上げ、前記油圧ユニット１１内に穿設された開弁用油通路１３に油圧を発生させてブリッジ４直上のスレーブピストン１４を下降させ、このマスターピストン１２によりブリッジ４を介し両バルブ３を押し下げて開弁させるようになっている。 One end of the rocker arm 10 pushes up a master piston 12 provided in the upper hydraulic unit 11 to generate hydraulic pressure in a valve opening oil passage 13 formed in the hydraulic unit 11, thereby generating a slave piston just above the bridge 4. 14 is lowered, and both the valves 3 are pushed down by the master piston 12 via the bridge 4 to be opened.
ところで、前記油圧ユニット１１内の開弁用油通路１３には、該開弁用油通路１３の油圧の保持・開放を切り替えるためのソレノイドバルブ１５を介して給油通路１６が接続されており、図示しないエンジン駆動のオイルポンプにより送り込まれる作動油１７を開弁用油通路１３に導き入れて該開弁用油通路１３内を満たし、マスターピストン１２の作動時には開弁用油通路１３の油圧の保持・開放を適宜に切り替えてスレーブピストン１４の作動タイミングを制御することでバルブ３の開閉タイミングを調節し得るようになっている。 Incidentally, an oil supply passage 16 is connected to the valve opening oil passage 13 in the hydraulic unit 11 via a solenoid valve 15 for switching between holding and releasing the oil pressure of the valve opening oil passage 13. The hydraulic oil 17 fed by the engine-driven oil pump is introduced into the valve opening oil passage 13 to fill the valve opening oil passage 13, and when the master piston 12 is operated, the hydraulic pressure of the valve opening oil passage 13 is maintained. The opening / closing timing of the valve 3 can be adjusted by switching the opening appropriately and controlling the operation timing of the slave piston 14.
すなわち、マスターピストン１２の作動時において、ソレノイドバルブ１５により開弁用油通路１３の油圧を保持すれば、マスターピストン１２の作動に直ちに追従してスレーブピストン１４が作動することになるが、マスターピストン１２の作動により生じる開弁用油通路１３の油圧をソレノイドバルブ１５の開放によりアキュームレータへ逃がせば、マスターピストン１２が作動していてもスレーブピストン１４が追従しなくなるので、その作動タイミングを調節することができる。 That is, when the master piston 12 is operated, if the hydraulic pressure of the valve opening oil passage 13 is held by the solenoid valve 15, the slave piston 14 is operated immediately following the operation of the master piston 12. If the hydraulic pressure of the valve opening oil passage 13 generated by the operation of the valve 12 is released to the accumulator by opening the solenoid valve 15, the slave piston 14 will not follow even if the master piston 12 is operated, so the operation timing is adjusted. Can do.
ところで、このような油圧を利用してバルブを開閉する油圧式可変バルブ機構にあっては、もし装置に異常が発生した場合には、異常の発生を早急に検知して、適切に対処することが望まれる。これにより、より重大な故障への拡大等を未然に防止することができ、エンジン本体への損傷を最小限に留めることなどが可能となる。 By the way, in a hydraulic variable valve mechanism that opens and closes a valve using such hydraulic pressure, if an abnormality occurs in the device, the occurrence of the abnormality should be detected immediately and appropriately dealt with. Is desired. As a result, expansion to a more serious failure can be prevented, and damage to the engine body can be minimized.
このようなことから、例えば、特許文献２に記載の排気弁の故障検知装置では、図６に示すように、内燃機関の油圧駆動排気弁装置において、排気弁１の開閉時期を検知するために動かない部分に取付けられた近接スイッチ６と、前記近接スイッチ６の検知データ排気弁開のクランク角θ’０、排気弁閉のクランク角θ’ｃと予め設定された正常値θ０，θｃとの比較から正常、異常を判定し、異常の場合に対応信号を発するデータ処理装置７〜１３と、を備えて構成されている。 For this reason, for example, in the exhaust valve failure detection device described in Patent Document 2, as shown in FIG. 6, in order to detect the opening / closing timing of the exhaust valve 1 in the hydraulically driven exhaust valve device of the internal combustion engine. Proximity switch 6 attached to a non-moving part, detection data of proximity switch 6 Crank angle θ ′ 0 for opening exhaust valve, crank angle θ′c for closing exhaust valve, and preset normal values θ 0 , θc And data processing devices 7 to 13 that determine normality and abnormality from the comparison and issue a corresponding signal in the case of abnormality.
しかしながら、特許文献２に記載されているような油圧式可変バルブ機構における油圧機構の故障検知装置では、故障検出精度を高めるためには、各バルブ（各気筒の吸気弁、排気弁）の動作状況を知るための近接スイッチ６を多数設ける必要があるため、構成が複雑化して高コスト化すると共に、設置スペースが多く必要になるなど搭載レイアウト上の問題も生じ得る。 However, in the hydraulic mechanism failure detection device in the hydraulic variable valve mechanism as described in Patent Document 2, in order to increase the failure detection accuracy, the operation status of each valve (intake valve and exhaust valve of each cylinder) Since it is necessary to provide a large number of proximity switches 6 for knowing the above, the configuration is complicated and the cost is increased, and a problem in mounting layout such as a large installation space is required.
本発明は、かかる実情に鑑みなされたもので、比較的簡単かつ低コストな構成でありながら、内燃機関の油圧式可変バルブ装置における油圧機構の故障等の異常を精度良く診断（検出）することができる油圧式可変バルブ装置の異常診断装置を提供することを目的とする。 The present invention has been made in view of such circumstances, and is capable of accurately diagnosing (detecting) an abnormality such as a failure of a hydraulic mechanism in a hydraulic variable valve device of an internal combustion engine while having a relatively simple and low-cost configuration. An object of the present invention is to provide an abnormality diagnosis device for a hydraulic variable valve device that can perform the above-described operation.
このため、本発明に係る油圧式可変バルブ装置の異常診断装置は、
内燃機関の燃焼室と外部とを連通・遮断するためのバルブの開閉動作を回転駆動されるカムにより行わせると共に、カムとバルブの間に設けられた圧力室内の油圧を制御することでバルブの開閉動作を可変に行うようにした油圧式可変バルブ装置の異常診断装置であって、
前記圧力室に供給されるオイルの供給通路の途中に介装される電磁弁を備え、
前記電磁弁を閉弁した状態として、当該電磁弁と前記圧力室とを接続する高圧側通路内の油圧を高圧に維持してバルブの開閉動作を行わせる一方で、前記電磁弁を開弁することで高圧側通路内の油圧を、当該電磁弁よりオイル供給方向上流側の低圧側通路に解放させてバルブの閉弁時期を可変に制御するものにおいて、
内燃機関の運転中において、内燃機関の運転状態に応じた前記電磁弁の開弁後の高圧側通路内の油圧の低下度合いに基づいて、油圧式可変バルブ装置の異常の有無を診断することを特徴とする。
For this reason, the abnormality diagnosis device for a hydraulic variable valve device according to the present invention is:
A valve that opens and closes the combustion chamber of the internal combustion engine and the outside is opened and closed by a rotationally driven cam, and the hydraulic pressure in the pressure chamber provided between the cam and the valve is controlled to control the valve. An abnormality diagnosis device for a hydraulic variable valve device that variably performs opening and closing operations,
An electromagnetic valve interposed in the middle of a supply passage of oil supplied to the pressure chamber;
With the solenoid valve closed, the hydraulic pressure in the high-pressure side passage connecting the solenoid valve and the pressure chamber is maintained at a high pressure to open and close the valve, while opening the solenoid valve. In this way, the hydraulic pressure in the high pressure side passage is released to the low pressure side passage upstream of the solenoid valve in the oil supply direction, and the valve closing timing is variably controlled.
During operation of the internal combustion engine , diagnosing whether there is an abnormality in the hydraulic variable valve device based on the degree of decrease in the hydraulic pressure in the high-pressure side passage after the opening of the solenoid valve according to the operation state of the internal combustion engine Features.
本発明において、前記電磁弁への開弁指令から、高圧側通路内の油圧が異常診断基準値に至るまでの経過時間に応じて、油圧式可変バルブ装置の異常の有無を診断することを特徴とすることができる。 In the present invention, the presence or absence of an abnormality of the hydraulic variable valve device is diagnosed according to an elapsed time from the opening command to the electromagnetic valve until the hydraulic pressure in the high-pressure side passage reaches the abnormality diagnosis reference value. It can be.
本発明において、前記異常診断基準値は、内燃機関の運転状態に応じて予め設定されることを特徴とすることができる。 In the present invention, the abnormality diagnosis reference value may be preset according to an operating state of the internal combustion engine.
本発明において、前記異常診断基準値は、前記電磁弁よりオイル供給方向上流側の低圧側通路内の油圧相当値であることを特徴とすることができる。
In the present invention, the abnormality diagnosing reference value can be, wherein a hydraulic equivalent value in the low-pressure side passage of the oil supply direction upstream side of the solenoid valve.
本発明によれば、比較的簡単かつ低コストな構成でありながら、内燃機関の油圧式可変バルブ装置における油圧機構の故障等の異常を精度良く診断（検出）することができる油圧式可変バルブ装置の異常診断装置を提供することができる。 According to the present invention, a hydraulic variable valve device capable of accurately diagnosing (detecting) an abnormality such as a failure of a hydraulic mechanism in a hydraulic variable valve device of an internal combustion engine while having a relatively simple and low-cost configuration. An abnormality diagnosis apparatus can be provided.
以下、本発明に係る一実施の形態を、添付の図面を参照しつつ説明する。なお、以下で説明する実施の形態により、本発明が限定されるものではない。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments described below.
本実施の形態の実施例１に係る内燃機関の油圧式可変バルブ装置１００は、図１に示すように、内燃機関の燃焼室（気筒）１３０に臨んで設けられる一対の弁（バルブ）１１０を油圧により開閉駆動する。なお、一対の弁１１０は、吸気弁、排気弁の何れであっても良いものであるが、ここでは吸気弁として、以下説明することとする。 As shown in FIG. 1, a hydraulic variable valve device 100 for an internal combustion engine according to Example 1 of the present embodiment includes a pair of valves (valves) 110 provided facing a combustion chamber (cylinder) 130 of the internal combustion engine. Open and close by hydraulic pressure. The pair of valves 110 may be either an intake valve or an exhaust valve, but here, the intake valve will be described below.
一対の吸気弁１１０は、図１に示したように、シリンダヘッド１６０に開口されている一対の吸気ポート１２０と、燃焼室１３０と、を連通・遮断するための開閉弁（ポペット弁）であり、吸気弁１１０と略一体のスプリングアッパーシート１５０とシリンダヘッド１６０の間に介装されるバルブスプリング１４０により、通常は閉弁付勢されている（図１の状態）。 As shown in FIG. 1, the pair of intake valves 110 are open / close valves (poppet valves) for communicating / blocking the pair of intake ports 120 opened in the cylinder head 160 and the combustion chamber 130. The valve spring 140 is interposed between the spring upper seat 150 and the cylinder head 160, which are substantially integrated with the intake valve 110, and is normally urged to close the valve (state shown in FIG. 1).
本実施例に係る油圧式可変バルブ装置１００の油圧駆動装置２００は、オイル供給通路２１０を含んで構成され、該オイル供給通路２１０の基端側は、図示しないオイルポンプ等に連通される一方、オイル供給通路２１０の先端側は、上下方向に摺動自在に支持されるピストン２６０の背面に油圧を作用させるための圧力室２３０に連通されている。 The hydraulic drive device 200 of the hydraulic variable valve device 100 according to this embodiment includes an oil supply passage 210, and the base end side of the oil supply passage 210 is communicated with an oil pump or the like (not shown). The distal end side of the oil supply passage 210 is communicated with a pressure chamber 230 for applying hydraulic pressure to the back surface of the piston 260 that is slidably supported in the vertical direction.
オイル供給通路２１０の途中には、電磁弁２２０が介装され、この電磁弁２２０の開閉動作により、オイル供給通路２１０の連通・遮断が切り換えられるように構成されている。ここで、オイル供給通路２１０の電磁弁２２０よりオイル供給方向下流側を高圧側油路と称し、上流側を低圧側油路と称する。
An electromagnetic valve 220 is interposed in the middle of the oil supply passage 210, and the connection / blocking of the oil supply passage 210 is switched by the opening / closing operation of the electromagnetic valve 220. Here, the downstream side of the oil supply passage 210 in the oil supply direction from the electromagnetic valve 220 is referred to as a high pressure side oil passage, and the upstream side is referred to as a low pressure side oil passage.
また、内燃機関のカムシャフト（図示せず）に取り付けられているカム３００の外周にはタペット２４０が当接されており、回転駆動されるカム３００は、その外周形状（カムプロフィール ）に従ってタペット２４０をシリンダヘッド１６０に対して図中上下方向に相対移動させることができるようになっている。 Further, a tappet 240 is in contact with an outer periphery of a cam 300 attached to a camshaft (not shown) of the internal combustion engine, and the cam 300 to be rotationally driven is in accordance with its outer peripheral shape (cam profile). Can be moved relative to the cylinder head 160 in the vertical direction in the figure.
タペット２４０は有底円筒状に構成されていて、図１において上側が有底とされてカム３００と当接される一方で、図１において下側が開口されてピストン２６０を収容するように構成されている。 The tappet 240 has a bottomed cylindrical shape, and is configured such that the upper side is bottomed in FIG. 1 and comes into contact with the cam 300, while the lower side is opened in FIG. ing.
タペット２４０の内側には、図１に示すように、ピストン２６０が摺動自在に収容されると共に、ピストン２６０の背面とタペット２４０の内壁とにより圧力室２３０が画成されると共に、タペット２４０の側面には、圧力室２３０とオイル供給通路２１０とを連通する通路２５０が開口されている。 As shown in FIG. 1, the piston 260 is slidably accommodated inside the tappet 240, and a pressure chamber 230 is defined by the back surface of the piston 260 and the inner wall of the tappet 240. A passage 250 that communicates the pressure chamber 230 and the oil supply passage 210 is opened on the side surface.
そして、油圧駆動装置２００が、電磁弁２２０を閉弁動作して、オイル供給通路２１０の高圧側油路と低圧側油路との間の連通を遮断した状態とし、電磁弁２２０より先端側の高圧側油路内のオイルを高圧に維持可能な状態にすることで、カム３００が回転することでタペット２４０を図１下方に押し下げる動作に伴って、高圧側油路延いては圧力室２３０の油圧を高圧に昇圧させて、ピストン２６０延いてはブリッジ１７０を図１下方に押し下げ、更には一対の吸気弁１１０を開弁させるようになっている。 Then, the hydraulic drive device 200 closes the electromagnetic valve 220 to shut off the communication between the high-pressure side oil passage and the low-pressure side oil passage of the oil supply passage 210, By bringing the oil in the high-pressure side oil passage into a state where it can be maintained at a high pressure, the cam 300 rotates to push down the tappet 240 downward in FIG. The hydraulic pressure is increased to a high pressure, the piston 260 and the bridge 170 are pushed downward in FIG. 1, and the pair of intake valves 110 are opened.
従って、例えば電磁弁２２０を閉弁タイミングを制御することで、高圧側油路の昇圧タイミングを可変とすることができるため、カム３００の外周形状が一つであっても、例えば内燃機関の運転状態に応じて、吸気弁１１０の開弁タイミングを可変に制御可能となっている。 Therefore, for example, by controlling the valve closing timing of the electromagnetic valve 220, the pressure increasing timing of the high pressure side oil passage can be made variable, so that even if the cam 300 has only one outer peripheral shape, for example, the operation of the internal combustion engine The valve opening timing of the intake valve 110 can be variably controlled according to the state.
この一方、吸気弁１１０の開弁状態から閉弁動作へ移行してカム３００が回転することでタペット２４０が図１上方に移動される際に、油圧駆動装置２００が、電磁弁２２０を開弁動作してオイル供給通路２１０の高圧側油路と低圧側油路とを連通させた状態とすると、高圧側油路延いては圧力室２３０の油圧が解放されることとなるため、その解放タイミングに応じて一対の吸気弁１１０の閉弁タイミングを制御可能となっている。 On the other hand, when the tappet 240 is moved upward in FIG. 1 by the cam 300 rotating from the open state of the intake valve 110 to the valve closing operation, the hydraulic drive device 200 opens the electromagnetic valve 220. When the high pressure side oil passage and the low pressure side oil passage of the oil supply passage 210 are in communication with each other, the high pressure side oil passage and the hydraulic pressure in the pressure chamber 230 are released. Accordingly, the closing timing of the pair of intake valves 110 can be controlled.
すなわち、電磁弁２２０を開弁タイミングを制御することで、高圧側油路延いては圧力室２３０の油圧の圧力解放タイミングを可変とすることができるため、カム３００の外周形状が一つであっても、例えば内燃機関の運転状態に応じて、吸気弁１１０の開弁タイミングを可変に制御可能となっている（図１のバルブリフト変化図を参照）。 That is, by controlling the valve opening timing of the electromagnetic valve 220, the pressure release timing of the hydraulic pressure in the high pressure side oil passage and the pressure chamber 230 can be made variable, so the cam 300 has only one outer peripheral shape. However, for example, the valve opening timing of the intake valve 110 can be variably controlled in accordance with the operating state of the internal combustion engine (see the valve lift variation diagram of FIG. 1).
このような油圧駆動装置２００を備えた油圧式可変バルブ装置１００に関し、本実施例に係る異常診断装置（異常検出装置）５００では、以下のようにして、異常発生の有無を診断（検出）するようになっている。異常診断装置５００は、ＣＰＵ、ＲＯＭ，ＲＡＭ，各種のインターフェースを備えて構成されるＥＣＵ（エンジンコントロールユニット）などがその機能を奏することができる。 With regard to the hydraulic variable valve device 100 including such a hydraulic drive device 200, the abnormality diagnosis device (abnormality detection device) 500 according to the present embodiment diagnoses (detects) the presence or absence of an abnormality as follows. It is like that. In the abnormality diagnosis device 500, a CPU, a ROM, a RAM, an ECU (engine control unit) configured with various interfaces, and the like can perform their functions.
本実施例では、図１に示すように、高圧側油路延いては圧力室２３０の油圧を検出するため油圧センサ４００が備えられていて、当該油圧センサ４００により取得される油圧情報が、異常診断装置５００に入力されている。 In this embodiment, as shown in FIG. 1, a hydraulic sensor 400 is provided for detecting the hydraulic pressure of the high pressure side oil passage and the pressure chamber 230, and the hydraulic pressure information acquired by the hydraulic sensor 400 is abnormal. It is input to the diagnostic device 500.
そして、異常診断装置５００では、油圧センサ４００により取得される油圧情報に基づいて、油圧駆動装置２００を備えた油圧式可変バルブ装置１００の異常の有無を検出する。 Then, the abnormality diagnosis device 500 detects the presence or absence of abnormality of the hydraulic variable valve device 100 including the hydraulic drive device 200 based on the hydraulic pressure information acquired by the hydraulic sensor 400.
すなわち、本実施例に係る油圧式可変バルブ装置１００は、電磁弁２２０を閉弁動作してオイル供給通路２１０の高圧側油路と低圧側油路との間の連通を遮断することで、高圧側油路延いては圧力室２３０内の油圧を維持可能な状態として、かかる状態においてカム３００が回転することで高圧側油路延いては圧力室２３０内に高圧を発生させて、タペット２４０を図１下方に押し下げ、ピストン２６０延いてはブリッジ１７０を下方に押し下げ、更には一対の吸気弁１１０を開弁させる構成である。そして、電磁弁２２０の開弁により、任意のタイミングで、高圧側油路延いては圧力室２３０内の油圧を解放させることで、一対の吸気弁１１０を閉弁させることができる構成となっている。 That is, the hydraulic variable valve device 100 according to the present embodiment closes the electromagnetic valve 220 and shuts off the communication between the high-pressure side oil passage and the low-pressure side oil passage of the oil supply passage 210, thereby increasing the pressure. The hydraulic oil in the pressure chamber 230 can be maintained by extending the side oil passage, and the cam 300 rotates in such a state to generate a high pressure in the high pressure side oil passage and in the pressure chamber 230. 1, the piston 260 and the bridge 170 are pushed downward, and the pair of intake valves 110 are further opened. Then, by opening the electromagnetic valve 220, the pair of intake valves 110 can be closed by releasing the hydraulic pressure in the high pressure side oil passage and the pressure chamber 230 at an arbitrary timing. Yes.
このため、高圧側油路側の油圧（ＰＨ）が、低圧側油路側の油圧（ＰＬ）より高くなければ、一対の吸気弁１１０は閉弁することになる。 For this reason, if the oil pressure (PH) on the high-pressure side oil passage side is not higher than the oil pressure (PL) on the low-pressure side oil passage side, the pair of intake valves 110 are closed.
この高圧側油路側の油圧（ＰＨ）を、油圧センサ４００により取得し、電磁弁２２０を開弁してから、高圧側油路側の油圧（ＰＨ）の低下度合い（例えば高圧側油路側の油圧（ＰＨ）が低圧側油路側の油圧（ＰＬ）と同じになるまでの時間や、時間に対する圧力低下の傾きなど）によって、一対の吸気弁１１０のバルブリフト延いては油圧式可変バルブ装置１００が正常に動作しているか否か（すなわち、高圧側油路や圧力室２３０の油圧漏れなどの異常の発生の有無）を判断することができる。 The hydraulic pressure (PH) on the high pressure side oil passage is acquired by the hydraulic pressure sensor 400 and the solenoid valve 220 is opened, and then the degree of decrease in the hydraulic pressure (PH) on the high pressure side oil passage (for example, the hydraulic pressure on the high pressure side oil passage ( PH) is equal to the oil pressure (PL) on the low-pressure side oil passage side, the slope of the pressure drop with respect to time, etc., and the valve lift of the pair of intake valves 110 and the hydraulic variable valve device 100 are normal. (That is, whether or not there is an abnormality such as a hydraulic leak in the high-pressure side oil passage or the pressure chamber 230).
図２（Ａ）に示すように、正常時においては、内燃機関の運転状態に応じて設定された開弁タイミングにおいて電磁弁２２０を開弁すると、一対の吸気弁１１０のバルブリフト（量）は、実線に沿って低下する。図２（Ａ）中、破線は電磁弁２２０を開弁しない場合における一対の吸気弁１１０のバルブリフト（量）の低下の様子を示している。 As shown in FIG. 2A, when the solenoid valve 220 is opened at the valve opening timing set according to the operating state of the internal combustion engine, the valve lift (amount) of the pair of intake valves 110 is normal. , Drop along the solid line. In FIG. 2A, a broken line indicates a state of a decrease in the valve lift (amount) of the pair of intake valves 110 when the solenoid valve 220 is not opened.
このとき、図２（Ｂ）に示すように、正常時における高圧側油路側の油圧（ＰＨ）は、電磁弁２２０が開弁された後、所定時間後に、低圧側油路側の油圧（ＰＬ）まで低下する。なお、この所定時間は、予め定めることができるが、内燃機関の回転速度、バルブリフト特性等の運転状態に応じて変化する。 At this time, as shown in FIG. 2B, the hydraulic pressure (PH) on the high-pressure side oil passage at normal time is the hydraulic pressure (PL) on the low-pressure side oil passage side after a predetermined time after the solenoid valve 220 is opened. To fall. The predetermined time can be determined in advance, but varies depending on the operating state such as the rotational speed of the internal combustion engine and valve lift characteristics.
一方で、異常がある場合には、図３（Ａ）に示すように、一対の吸気弁１１０のバルブリフト（量）が自身の開弁時から正常時のバルブリフト（量）に比べて小さいと共に、内燃機関の運転状態に応じて設定された開弁タイミングにおいて電磁弁２２０を開弁すると、一対の吸気弁１１０のバルブリフト（量）は、正常時に比べて早期に低下する傾向となる。図３（Ａ）中、異常時のバルブリフトに連続する破線は電磁弁２２０を開弁しない場合における一対の吸気弁１１０のバルブリフト（量）の低下の様子を示している。 On the other hand, when there is an abnormality, as shown in FIG. 3A, the valve lift (amount) of the pair of intake valves 110 is smaller than the normal valve lift (amount) from the time when the valve is opened. At the same time, when the solenoid valve 220 is opened at the valve opening timing set according to the operating state of the internal combustion engine, the valve lift (amount) of the pair of intake valves 110 tends to decrease earlier than normal. In FIG. 3A, a broken line continuing to the valve lift at the time of abnormality indicates a state of a decrease in the valve lift (amount) of the pair of intake valves 110 when the solenoid valve 220 is not opened.
このとき、図３（Ｂ）に示すように、異常時における高圧側油路側の油圧（ＰＨ）は、電磁弁２２０の開弁前から正常時の高圧側油路側の油圧（ＰＨ）に比べて小さいと共に、電磁弁２２０が開弁された後、低圧側油路側の油圧（ＰＬ）まで低下するのに要する時間が正常時に比べて短くなるといった傾向となる。 At this time, as shown in FIG. 3 (B), the hydraulic pressure (PH) on the high-pressure side oil passage side at the time of abnormality is compared with the hydraulic pressure (PH) on the high-pressure side oil passage side during normal operation from before the solenoid valve 220 is opened. In addition to being small, after the solenoid valve 220 is opened, the time required to decrease to the oil pressure (PL) on the low pressure side oil passage side tends to be shorter than normal.
すなわち、本実施例に係る異常診断装置５００では、かかる特性を利用して、一対の吸気弁１１０のバルブリフト延いては油圧式可変バルブ装置１００が正常に動作しているか否か（すなわち高圧側油路や圧力室２３０の油圧漏れなどの異常の発生の有無）を判断する。 That is, in the abnormality diagnosis apparatus 500 according to the present embodiment, whether or not the valve lift of the pair of intake valves 110 and the hydraulic variable valve apparatus 100 are operating normally by utilizing such characteristics (that is, the high pressure side) Whether or not there is an abnormality such as a hydraulic leak in the oil passage or the pressure chamber 230).
例えば、本実施例に係る異常診断装置５００は、図４のフローチャートに示すように、
ステップ（以下、Ｓと記す。）１では、高圧側油路側の油圧（ＰＨ）を、油圧センサ４００により取得してモニターする。
For example, the abnormality diagnosis apparatus 500 according to the present embodiment, as shown in the flowchart of FIG.
In step (hereinafter referred to as S) 1, the hydraulic pressure (PH) on the high-pressure side oil passage is acquired and monitored by the hydraulic pressure sensor 400.
Ｓ２では、電磁弁２２０の開弁指令があったか否かを判断する。ＹＥＳの場合はＳ３へ進み、ＮＯの場合はリターンしてＳ２を繰り返す。 In S2, it is determined whether or not there has been a command to open the electromagnetic valve 220. If yes, then continue with S3, if no, return and repeat S2.
Ｓ３では、高圧側油路側の油圧（ＰＨ）が所定レベルへ低下するまでに要した時間（ＴＨ）を計測する。この所定レベルとしては、例えば、運転状態に応じて予め設定された値（例えば低圧側油路側の油圧（ＰＬ）相当値）、或いは実際に油圧センサなどによって取得される低圧側油路側の油圧（ＰＬ）などとすることができる。 In S3, the time (TH) required until the hydraulic pressure (PH) on the high-pressure side oil passage side decreases to a predetermined level is measured. As this predetermined level, for example, a preset value (for example, a low pressure side oil passage side hydraulic pressure (PL) equivalent value) according to the operating state, or a low pressure side oil passage side hydraulic pressure (actually acquired by a hydraulic sensor or the like) PL).
Ｓ４では、Ｓ３で取得した時間（ＴＨ）と、予め定めた異常診断時間（ＴＢ）（異常診断のための基準値）と、を比較する。
時間（ＴＨ）＜第１異常診断時間（ＴＢ１＝ＴＢ−ａ）である場合には、Ｓ５へ進む。
時間（ＴＨ）が第１異常診断時間（ＴＢ１＝ＴＢ−ａ）と第２異常診断時間（ＴＢ２＝ＴＢ＋ｂ）の間の範囲（正常の範囲）にある場合には、Ｓ６へ進む。
時間（ＴＨ）＞第２異常診断時間（ＴＢ２＝ＴＢ＋ｂ）である場合には、Ｓ７へ進む。
なお、ａ，ｂの値は診断精度に影響するため適宜の値に設定することができ、ａ＝ｂとすることもできるし、ａ，ｂを省略することなどもできる。
In S4, the time (TH) acquired in S3 is compared with a predetermined abnormality diagnosis time (TB) (reference value for abnormality diagnosis).
If time (TH) <first abnormality diagnosis time (TB1 = TB−a), the process proceeds to S5.
When the time (TH) is in the range (normal range) between the first abnormality diagnosis time (TB1 = TB−a) and the second abnormality diagnosis time (TB2 = TB + b), the process proceeds to S6.
If time (TH)> second abnormality diagnosis time (TB2 = TB + b), the process proceeds to S7.
It should be noted that the values of a and b can be set to appropriate values because they affect the diagnostic accuracy, and a = b can be set, or a and b can be omitted.
Ｓ５へ進む場合は、時間（ＴＨ）＜第１異常診断時間（ＴＢ１＝ＴＢ−ａ）であるので、何らかの原因により、高圧側油路側の油圧（ＰＨ）の油圧低下速度が正常時に比べて速く、高圧側油路や圧力室２３０の油圧漏れなどの異常の発生しているおそれがあると異常診断（異常判定）する。 In the case of proceeding to S5, since time (TH) <first abnormality diagnosis time (TB1 = TB-a), the hydraulic pressure decrease rate of the hydraulic pressure (PH) on the high-pressure side oil passage side is faster than normal due to some cause. When there is a possibility that an abnormality such as a hydraulic leak in the high-pressure side oil passage or the pressure chamber 230 has occurred, an abnormality diagnosis (abnormality determination) is performed.
Ｓ６へ進む場合は、時間（ＴＨ）が正常の範囲内にあるので、異常無しと診断（正常判定）する。 In the case of proceeding to S6, since the time (TH) is within the normal range, it is diagnosed that there is no abnormality (normal determination).
Ｓ７へ進む場合は、時間（ＴＨ）＞第２異常診断時間（ＴＢ２＝ＴＢ＋ｂ）であるので、何らかの原因により、高圧側油路側の油圧（ＰＨ）の油圧低下速度が正常時に比べて遅く、油圧式可変バルブ装置１００に異常が発生しているおそれがあると異常診断（異常判定）する。 When the process proceeds to S7, since time (TH)> second abnormality diagnosis time (TB2 = TB + b), for some reason, the hydraulic pressure decrease speed of the hydraulic pressure (PH) on the high-pressure side oil passage side is slower than normal, and the hydraulic pressure If there is a possibility that an abnormality has occurred in the variable valve device 100, an abnormality diagnosis (abnormality determination) is performed.
異常診断（異常判定）があった場合には、Ｓ８にて、運転者に異常を報知させるために警告音や警告灯などを作動させる一方で、メモリに異常診断結果を記憶させて修理等のサービスの際に情報を提供可能としてサービスの迅速化や質の向上に資すると共に、内燃機関に重大な損傷等が生じないように内燃機関の運転を強制停止したり、内燃機関の出力を制限したフェイルセーフモードでの運転のみを許可するなどの処置を施して、本フローを終了する。 If there is an abnormality diagnosis (abnormality determination), in S8, a warning sound or a warning light is operated to notify the driver of the abnormality, while the abnormality diagnosis result is stored in the memory and repaired. Information can be provided at the time of service, which contributes to speeding up of service and improvement of quality, as well as forcibly shutting down the internal combustion engine and limiting the output of the internal combustion engine to prevent serious damage to the internal combustion engine. This flow is terminated after taking measures such as permitting only the operation in the fail-safe mode.
このように、本実施例に係る異常診断装置５００によれば、一対の吸気弁１１０の開閉駆動のためにカム３００の作用によって昇圧される油圧を蓄える高圧側油路の油圧（ＰＨ）を、油圧センサ４００により取得し、高圧側油路の油圧（ＰＨ）を解放させるための電磁弁２２０への開弁指令があってからの高圧側油路の油圧（ＰＨ）の低下度合いに基づいて、一対の吸気弁１１０のバルブリフト延いては油圧式可変バルブ装置１００が正常に動作しているか否か（すなわち、高圧側油路や圧力室２３０の油圧漏れなどの異常の発生の有無）を検出するようにしたので、比較的簡単かつ低コストな構成でありながら、内燃機関の油圧式可変バルブ装置１００の油圧機構の故障等の異常の発生の有無を精度良く検出することができる。 Thus, according to the abnormality diagnosis apparatus 500 according to the present embodiment, the hydraulic pressure (PH) of the high-pressure side oil passage that stores the hydraulic pressure boosted by the action of the cam 300 for opening and closing the pair of intake valves 110, Based on the degree of decrease in the hydraulic pressure (PH) of the high-pressure side oil passage acquired from the hydraulic pressure sensor 400 and the opening of the solenoid valve 220 for releasing the hydraulic pressure (PH) of the high-pressure side oil passage. Detecting whether the valve lift of the pair of intake valves 110 and the hydraulic variable valve device 100 are operating normally (that is, whether there is an abnormality such as a hydraulic leak in the high-pressure side oil passage or the pressure chamber 230). As a result, it is possible to accurately detect the occurrence of an abnormality such as a failure of the hydraulic mechanism of the hydraulic variable valve device 100 of the internal combustion engine, with a relatively simple and low-cost configuration.
すなわち、本実施例によれば、比較的簡単かつ低コストな構成でありながら、内燃機関の油圧式可変バルブ装置における油圧機構の故障等の異常を精度良く診断（検出）することができる油圧式可変バルブ装置の異常診断装置を提供することができる。 That is, according to the present embodiment, a hydraulic type that can accurately diagnose (detect) an abnormality such as a failure of the hydraulic mechanism in the hydraulic variable valve device of the internal combustion engine, while having a relatively simple and low-cost configuration. An abnormality diagnosis device for a variable valve device can be provided.
ところで、本実施の形態において、内燃機関は、例えばディーゼル燃焼を行うディーゼルエンジンとすることができるが、本発明は、これに限定されるものではなく、ガソリンその他の物質を燃料とする内燃機関とすることができる。 By the way, in the present embodiment, the internal combustion engine can be, for example, a diesel engine that performs diesel combustion. However, the present invention is not limited to this, and an internal combustion engine that uses gasoline or other substances as fuel. can do.
また、本実施例では、吸気弁１１０を例示して説明したが、本発明はこれに限定されるものではなく排気弁にも適用可能である。 In this embodiment, the intake valve 110 has been described as an example. However, the present invention is not limited to this and can be applied to an exhaust valve.
また、本実施例では、吸気弁１１０を１気筒当たりに２つ備えた一対の吸気弁１１０をとして説明したが、本発明はこれに限定されるものではなく、吸気弁１１０を１気筒当たりに１つ備えた場合や３以上備えた場合にも適用可能である。 In this embodiment, a pair of intake valves 110 provided with two intake valves 110 per cylinder has been described. However, the present invention is not limited to this, and the intake valves 110 are provided per cylinder. The present invention can also be applied to the case where one is provided or three or more.
また、本実施例では、内燃機関の油圧式可変バルブ装置として図１に例示したものを代表的に説明してきたが、本発明はこれに限定されるものではなく、電磁弁の開閉により高圧なオイル供給通路内の油圧を維持・解放する機構を備えた油圧式可変バルブ装置（例えば、図５に示したような油圧式可変バルブ装置）の異常診断にも適用可能である。 In the present embodiment, the hydraulic variable valve device for the internal combustion engine has been described as representatively shown in FIG. 1. However, the present invention is not limited to this, and the pressure is increased by opening and closing the electromagnetic valve. The present invention is also applicable to abnormality diagnosis of a hydraulic variable valve device (for example, a hydraulic variable valve device as shown in FIG. 5) having a mechanism for maintaining and releasing the hydraulic pressure in the oil supply passage.
以上で説明した実施の形態は、本発明を説明するための例示に過ぎず、本発明の要旨を逸脱しない範囲内において、種々変更を加え得ることは可能である。 The embodiment described above is merely an example for explaining the present invention, and various modifications can be made without departing from the gist of the present invention.
１００ 内燃機関の油圧式可変バルブ装置
１３０ 燃焼室（気筒）
１１０ 弁（バルブ）（吸気弁、排気弁）
１４０ バルブスプリング
１５０ スプリングアッパーシート
１６０ シリンダヘッド
１７０ ブリッジ
２００ 油圧駆動装置
２１０ オイル供給通路
２２０ 電磁弁
２３０ 圧力室
２４０ タペット
２５０ 通路
２６０ ピストン
３００ カム
４００ 油圧センサ
５００ 異常診断装置（異常検出装置）
100 Hydraulic variable valve device for internal combustion engine 130 Combustion chamber (cylinder)
110 Valve (Valve) (Intake valve, Exhaust valve)
140 Valve spring 150 Spring upper seat 160 Cylinder head 170 Bridge 200 Hydraulic drive device 210 Oil supply passage 220 Solenoid valve 230 Pressure chamber 240 Tappet 250 Passage 260 Piston 300 Cam 400 Hydraulic sensor 500 Abnormality diagnosis device (abnormality detection device)
Claims (4)
前記圧力室に供給されるオイルの供給通路の途中に介装される電磁弁を備え、
前記電磁弁を閉弁した状態として、当該電磁弁と前記圧力室とを接続する高圧側通路内の油圧を高圧に維持してバルブの開閉動作を行わせる一方で、前記電磁弁を開弁することで高圧側通路内の油圧を、当該電磁弁よりオイル供給方向上流側の低圧側通路に解放させてバルブの閉弁時期を可変に制御するものにおいて、
内燃機関の運転中において、内燃機関の運転状態に応じた前記電磁弁の開弁後の高圧側通路内の油圧の低下度合いに基づいて、油圧式可変バルブ装置の異常の有無を診断することを特徴とする油圧式可変バルブ装置の異常診断装置。 A valve that opens and closes the combustion chamber of the internal combustion engine and the outside is opened and closed by a rotationally driven cam, and the hydraulic pressure in the pressure chamber provided between the cam and the valve is controlled to control the valve. An abnormality diagnosis device for a hydraulic variable valve device that variably performs opening and closing operations,
An electromagnetic valve interposed in the middle of a supply passage of oil supplied to the pressure chamber;
With the solenoid valve closed, the hydraulic pressure in the high-pressure side passage connecting the solenoid valve and the pressure chamber is maintained at a high pressure to open and close the valve, while opening the solenoid valve. In this way, the hydraulic pressure in the high pressure side passage is released to the low pressure side passage upstream of the solenoid valve in the oil supply direction, and the valve closing timing is variably controlled.
During operation of the internal combustion engine , diagnosing whether there is an abnormality in the hydraulic variable valve device based on the degree of decrease in the hydraulic pressure in the high-pressure side passage after the opening of the solenoid valve according to the operation state of the internal combustion engine An abnormality diagnosis device for a hydraulic variable valve device.
4. The abnormality diagnosis of the hydraulic variable valve device according to claim 2, wherein the abnormality diagnosis reference value is a hydraulic pressure equivalent value in a low pressure side passage upstream of the solenoid valve in the oil supply direction. apparatus.
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| JP6350975B2 (en) * | 2016-03-31 | 2018-07-04 | マツダ株式会社 | Engine control device |
| KR101886503B1 (en) | 2016-08-18 | 2018-08-07 | 현대자동차주식회사 | Method for diagonosing variable valve timing system |
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