JP4092343B2 - Self-diagnosis device for variable valve timing mechanism for internal combustion engine - Google Patents

Self-diagnosis device for variable valve timing mechanism for internal combustion engine Download PDF

Info

Publication number
JP4092343B2
JP4092343B2 JP2005165055A JP2005165055A JP4092343B2 JP 4092343 B2 JP4092343 B2 JP 4092343B2 JP 2005165055 A JP2005165055 A JP 2005165055A JP 2005165055 A JP2005165055 A JP 2005165055A JP 4092343 B2 JP4092343 B2 JP 4092343B2
Authority
JP
Japan
Prior art keywords
valve timing
variable valve
timing mechanism
response
rotational phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2005165055A
Other languages
Japanese (ja)
Other versions
JP2005299677A (en
Inventor
陽一郎 山岸
渡邊　　悟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2005165055A priority Critical patent/JP4092343B2/en
Publication of JP2005299677A publication Critical patent/JP2005299677A/en
Application granted granted Critical
Publication of JP4092343B2 publication Critical patent/JP4092343B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Description

本発明は内燃機関用可変バルブタイミング機構の自己診断装置に関し、詳しくは、カム軸の回転位相を変化させてバルブタイミングを変化させる可変バルブタイミング機構の異常を診断するための装置に関する。   The present invention relates to a self-diagnosis device for a variable valve timing mechanism for an internal combustion engine, and more particularly to a device for diagnosing an abnormality in a variable valve timing mechanism that changes a valve timing by changing a rotational phase of a camshaft.

従来から、カム軸の回転位相を変化させることで、バルブの開閉タイミングを早めたり遅らせたりする内燃機関用の可変バルブタイミング機構が知られている。
また、前記カム軸の回転位相が安定しているときに、実際に検出された回転位相に基づいて回転位相の異常を検出することが行われていた（特許文献１等参照）。
特開平０８−２４６８２０号公報 2. Description of the Related Art Conventionally, a variable valve timing mechanism for an internal combustion engine is known in which the opening / closing timing of a valve is advanced or delayed by changing the rotational phase of a cam shaft.
Further, when the rotational phase of the cam shaft is stable, an abnormality of the rotational phase is detected based on the actually detected rotational phase (see Patent Document 1).
Japanese Patent Laid-Open No. 08-246820

しかし、上記異常の診断は、定常的な回転位相の異常を診断するものであり、目標のステップ的な変化に対する応答性の劣化を診断できる構成ではなかった。
前記応答性の劣化が生じると、運転条件から要求されるバルブタイミング（回転位相）に到達するまでに時間がかかるため、この応答遅れの間に最適なバルブタイミングで吸・排気バルブを開閉駆動することができず、運転性を悪化させる可能性があり、前記応答性の劣化を診断する必要があったものである。 However, the diagnosis of the abnormality is for diagnosing a steady rotational phase abnormality, and is not configured to diagnose deterioration of responsiveness to a target step change.
When the responsiveness deterioration occurs, it takes time to reach the valve timing (rotation phase) required from the operating conditions. Therefore, the intake / exhaust valve is driven to open and close at the optimal valve timing during this response delay. In other words, there is a possibility that the drivability may be deteriorated, and it is necessary to diagnose the deterioration of the responsiveness.

本発明は上記問題点に鑑みなされたものであり、可変バルブタイミング機構の応答性の劣化を診断できる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 the above problems, and an object thereof is to provide a diagnostic device capable of diagnosing deterioration in responsiveness of a variable valve timing mechanism.

そのため、請求項１記載の発明は、カム軸の回転位相を変化させてバルブタイミングを変化させる内燃機関用可変バルブタイミング機構の自己診断装置であって、前記カム軸の回転位相を検出する回転位相検出手段と、少なくとも前記回転位相検出手段が正常であることを条件とする診断条件が成立するときに、前記カム軸の回転位相の目標値が変化してから所定時間が経過した時点において、前記回転位相検出手段で検出された回転位相と前記変化後の目標値との偏差が所定値未満であるときに前記可変バルブタイミング機構の応答が正常であると判定し、前記偏差が前記所定値以上のときに前記可変バルブタイミング機構の応答が異常であると判定して異常時処理を実行する応答異常診断手段と、前記カム軸の回転位相の目標値が変化してから前記所定時間経過後であって、前記応答異常診断手段が前記可変バルブタイミング機構の応答が正常であると判定していて、かつ、前記診断条件が成立する場合に、前記回転位相検出手段で検出される回転位相の変化が所定値以下で、かつ、前記回転位相検出手段で検出された回転位相とそのときの回転位相の目標値との偏差が所定値以上であると、前記可変バルブタイミング機構に定常偏差異常が生じていると判定する定常偏差異常診断手段と、を含んで構成されたことを特徴とする。 Therefore, the invention according to claim 1 is a self-diagnosis device for a variable valve timing mechanism for an internal combustion engine that changes the valve timing by changing the rotation phase of the cam shaft, and detects the rotation phase of the cam shaft. The detection means and at least a predetermined time after the target value of the rotation phase of the camshaft changes when a diagnosis condition is met on condition that at least the rotation phase detection means is normal, When the deviation between the rotational phase detected by the rotational phase detection means and the target value after the change is less than a predetermined value, it is determined that the response of the variable valve timing mechanism is normal, and the deviation is greater than or equal to the predetermined value the variable response of the valve timing mechanism is judged to be abnormal and the response abnormality diagnosis means for performing abnormality processing, the target value of the rotational phase of the camshaft is changed when the After the predetermined time has elapsed, when the response abnormality diagnosis means determines that the response of the variable valve timing mechanism is normal and the diagnosis condition is satisfied, the rotational phase detection means The variable valve timing when the detected change in rotational phase is not more than a predetermined value and the deviation between the rotational phase detected by the rotational phase detecting means and the target value of the rotational phase at that time is not less than a predetermined value. And a stationary deviation abnormality diagnosis means for determining that a stationary deviation abnormality has occurred in the mechanism .

かかる構成によると、回転位相の目標値がステップ的に変化し、かかる目標値のステップ変化に追従して実際の回転位相が変化するときに、所定時間が経過した時点で目標近傍にまで変化していない場合には、応答異常として診断されることになる。
従って、目標値がステップ変化してから所定時間が経過した時点の実際の回転位相と目標値とを比較することで、目標値のステップ変化に対して実際の回転位相の変化が遅れる応答性劣化を診断できるという効果がある。
更に、目標値のステップ変化に追従して実際の回転位相が安定した時点で、目標と実際の回転位相とを比較し、定常的なオフセットが発生しているか否かを診断する。
従って、目標回転位相のステップ変化に追従して実際の回転位相が安定した段階での実際の回転位相から、定常的な目標値と実際値との異常偏差の発生を診断できるという効果がある。
請求項２記載の発明では、前記定常偏差異常診断手段が、前記応答異常診断手段で応答が正常であると判定された場合に、前記応答異常診断手段による応答異常診断に続けて定常偏差異常診断を実施する。 According to such a configuration, the target value of the rotational phase changes stepwise, and when the actual rotational phase changes following the step change of the target value, it changes to the vicinity of the target when a predetermined time elapses. If not, it will be diagnosed as an abnormal response.
Therefore, by comparing the actual rotational phase at the time when a predetermined time has elapsed after the target value has changed in steps with the target value, the response deterioration that delays the actual rotational phase change with respect to the target value step change The effect is that can be diagnosed.
Furthermore, when the actual rotational phase is stabilized following the step change of the target value, the target is compared with the actual rotational phase to diagnose whether a steady offset has occurred.
Therefore, it is possible to diagnose the occurrence of an abnormal deviation between the steady target value and the actual value from the actual rotation phase when the actual rotation phase is stabilized following the step change of the target rotation phase.
In the invention according to claim 2, when the steady deviation abnormality diagnosis means determines that the response is normal by the response abnormality diagnosis means, the steady deviation abnormality diagnosis is performed following the response abnormality diagnosis by the response abnormality diagnosis means. To implement.

請求項３記載の発明では、前記応答異常診断手段が、前記所定時間と前記所定値との少なくとも一方を、前記目標値のステップ変化量に応じて変更する構成とした。かかる構成によると、ステップ変化量が大きいときにはステップ変化量が小さいときに比べて、応答性が正常であっても目標値に追いつくまでにより長い時間を要することになり、同じ経過時間で比較すると、目標に対する偏差がより大きくなる。そこで、実際の回転位相と目標値とを比較させる時点をステップ変化量に応じて変化させ、及び／又は、実際の回転位相と目標値との偏差に基づき異常診断させるときの判定レベルをステップ変化量に応じて変化させる構成とした。 According to a third aspect of the present invention, the response abnormality diagnosis means changes at least one of the predetermined time and the predetermined value according to a step change amount of the target value. According to such a configuration, when the step change amount is large, it takes a longer time to catch up with the target value even when the responsiveness is normal compared to when the step change amount is small. Deviation from the target is greater. Therefore, the time point at which the actual rotational phase is compared with the target value is changed according to the amount of step change, and / or the judgment level when making an abnormality diagnosis based on the deviation between the actual rotational phase and the target value is changed in steps. It was set as the structure changed according to quantity.

従って、ステップ変化量に応じて目標に追い付くまでの時間が変化することに対応して、応答異常を精度良く診断できるという効果がある。
請求項４記載の発明では、前記可変バルブタイミング機構が油圧によってカム軸の回転位相を変化させる構成であって、前記応答異常診断手段が、前記可変バルブタイミング機構の作動油の温度が所定温度以上であるときにのみ、応答異常の診断を行う構成とした。 Accordingly, there is an effect that the response abnormality can be diagnosed with high accuracy in response to the change in the time until the target is caught up according to the step change amount.
According to a fourth aspect of the present invention, the variable valve timing mechanism is configured to change the rotational phase of the camshaft by hydraulic pressure, and the response abnormality diagnosis means is configured such that the temperature of the hydraulic oil of the variable valve timing mechanism is equal to or higher than a predetermined temperature. Only when it is, it was set as the structure which diagnoses a response abnormality.

かかる構成によると、前記作動油の温度が低いと応答速度が低下し、見掛け上は応答性の劣化が生じているように判断されることになってしまうので、作動油の温度が充分に高くなっているときに診断を行わせ、油温以外の要因での応答劣化の発生を診断させる。
従って、作動油の温度が低いことによる応答性の低下を、応答異常として誤診断することを回避できるという効果がある。 According to this configuration, if the temperature of the hydraulic oil is low, the response speed is lowered, and it is judged that the response is apparently deteriorated. Therefore, the temperature of the hydraulic oil is sufficiently high. Diagnose the occurrence of response deterioration due to factors other than oil temperature.
Therefore, there is an effect that it is possible to avoid erroneously diagnosing a decrease in responsiveness due to the low temperature of the hydraulic oil as an abnormal response.

請求項５記載の発明では、前記可変バルブタイミング機構が油圧によってカム軸の回転位相を変化させる構成であって、前記応答異常診断手段が、前記所定時間と前記所定値との少なくとも一方を、前記可変バルブタイミング機構の作動油の温度に応じて変更する構成とした。かかる構成によると、前述のように作動油の温度で応答速度が変化するので、実際の回転位相と目標値とを比較させる時点を油温に応じて変化させ、及び／又は、実際の回転位相と目標値との偏差に基づき異常診断させるときの判定レベルを油温に応じて変化させる構成とした。 According to a fifth aspect of the present invention, the variable valve timing mechanism is configured to change the rotational phase of the camshaft by hydraulic pressure, and the response abnormality diagnosing means determines at least one of the predetermined time and the predetermined value as described above. It was set as the structure changed according to the temperature of the hydraulic fluid of a variable valve timing mechanism. According to such a configuration, as described above, the response speed changes depending on the temperature of the hydraulic oil, so that the time point at which the actual rotational phase is compared with the target value is changed according to the oil temperature and / or the actual rotational phase. The determination level when making an abnormality diagnosis based on the deviation between the target value and the target value is changed according to the oil temperature.

従って、作動油の温度に応じて目標に追い付くまでの時間が変化することに対応して、応答異常を精度良く診断できるという効果がある。
請求項６記載の発明では、前記可変バルブタイミング機構が油圧によってカム軸の回転位相を変化させる構成であって、油圧をリニアソレノイドバルブで制御する構成であり、前記応答異常診断手段が、前記所定時間と前記所定値との少なくとも一方を、前記リニアソレノイドバルブの電源電圧に応じて変更する構成とした。 Accordingly, there is an effect that a response abnormality can be accurately diagnosed in response to a change in the time until the target is caught up according to the temperature of the hydraulic oil.
According to a sixth aspect of the present invention, the variable valve timing mechanism is configured to change the rotational phase of the camshaft by hydraulic pressure, and is configured to control the hydraulic pressure with a linear solenoid valve. At least one of the time and the predetermined value is changed according to the power supply voltage of the linear solenoid valve.

かかる構成によると、前記リニアソレノイドバルブの電源電圧が変化すると、ステップ変化量や油温などの条件が同じでも応答速度が変化するので、実際の回転位相と目標値とを比較させる時点を電源電圧に応じて変化させ、及び／又は、実際の回転位相と目標値との偏差に基づき異常診断させるときの判定レベルを電源電圧に応じて変化させる構成とした。   According to such a configuration, when the power supply voltage of the linear solenoid valve changes, the response speed changes even if the conditions such as the step change amount and the oil temperature are the same, so the time point when the actual rotational phase is compared with the target value is the power supply voltage. And / or the determination level for abnormality diagnosis based on the deviation between the actual rotational phase and the target value is changed according to the power supply voltage.

従って、油圧を制御するリニアソレノイドバルブの電源電圧に応じて目標に追い付くまでの時間が変化することに対応して、応答異常を精度良く診断できるという効果がある。 Therefore, there is an effect that the response abnormality can be diagnosed with high accuracy in response to the change in the time until the target is caught up according to the power supply voltage of the linear solenoid valve that controls the hydraulic pressure .

以下、本発明の実施の形態を図に基づいて説明する。
図２は、実施の形態における内燃機関のシステム構成を示す図である。
この図２において、内燃機関１には、スロットルバルブ２で計量された空気が吸気バルブ３を介してシリンダ内に供給され、燃焼排気は、排気バルブ４を介して排出される。
前記吸気バルブ３，排気バルブ４は、吸気側カム軸，排気側カム軸にそれぞれ設けられたカムによって開閉駆動される。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 2 is a diagram showing a system configuration of the internal combustion engine in the embodiment.
In FIG. 2, the air measured by the throttle valve 2 is supplied into the cylinder through the intake valve 3 and the combustion exhaust gas is discharged through the exhaust valve 4 to the internal combustion engine 1.
The intake valve 3 and the exhaust valve 4 are opened and closed by cams provided on the intake side cam shaft and the exhaust side cam shaft, respectively.

前記吸気側カム軸５には、カム軸の回転位相を変化させることで、吸気バルブ３の開閉タイミングを連続的に早めたり遅くしたりする可変バルブタイミング機構６が備えられている。
前記可変バルブタイミング機構６は、油圧によって前記回転位相を連続的に変化させる構成であり、油圧を調整するリニアソレノイドバルブ（図示省略）に対する通電量をコントロールユニット７から出力される通電制御信号のデューティ（ＯＮデューティ）に応じて制御することで、カム軸の回転位相が制御される構成である。 The intake camshaft 5 is provided with a variable valve timing mechanism 6 that continuously advances or slows the opening / closing timing of the intake valve 3 by changing the rotational phase of the camshaft.
The variable valve timing mechanism 6 is configured to continuously change the rotation phase by hydraulic pressure, and the duty of an energization control signal output from the control unit 7 to the amount of energization to a linear solenoid valve (not shown) for adjusting the hydraulic pressure. By controlling according to (ON duty), the rotational phase of the cam shaft is controlled.

また、回転位相の最遅角側と最進角側とがそれぞれストッパで制限される構成となっており、前記デューティを増大させていくと、１００％に達する前に最進角側のストッパに当接し、また、前記デューティを減少させていくと、０％に達する前に最遅角側のストッパに当接するように構成されている。
尚、本実施の形態では、可変バルブタイミング機構６が、吸気バルブ３の開閉タイミングを変化させる構成としたが、吸気バルブ３に代えて排気バルブ４の開閉タイミングを変化させる構成であっても良いし、吸気バルブ３と排気バルブ４との両方の開閉タイミングを変化させる構成であっても良い。 Further, the most retarded angle side and the most advanced angle side of the rotation phase are limited by the stoppers respectively. As the duty is increased, the most advanced angle side stopper is reached before reaching 100%. When the duty is decreased, the duty is made to come into contact with the most retarded stopper before reaching 0%.
In the present embodiment, the variable valve timing mechanism 6 is configured to change the opening / closing timing of the intake valve 3, but may be configured to change the opening / closing timing of the exhaust valve 4 instead of the intake valve 3. However, a configuration in which the opening / closing timing of both the intake valve 3 and the exhaust valve 4 is changed may be employed.

マイクロコンピュータを内蔵するコントロールユニット７には、クランク軸の回転信号を出力するクランク角センサ８、吸気側カム軸５の回転信号を出力するカム角センサ９、機関１の吸入空気量を検出するエアフローメータ10等からの検出信号が入力される。
そして、コントロールユニット７は、機関負荷，機関回転速度などの運転条件に基づいて前記可変バルブタイミング機構６の目標バルブタイミング（カム軸の回転位相の目標値）を設定し、該目標値になるように前記通電制御信号のデューティ（ＯＮデューティ）を決定し、リニアソレノイドバルブに出力する。 The control unit 7 incorporating the microcomputer includes a crank angle sensor 8 that outputs a rotation signal of the crankshaft, a cam angle sensor 9 that outputs a rotation signal of the intake camshaft 5, and an air flow that detects the intake air amount of the engine 1. A detection signal is input from the meter 10 or the like.
Then, the control unit 7 sets the target valve timing (target value of the rotational phase of the camshaft) of the variable valve timing mechanism 6 based on the operating conditions such as the engine load and the engine rotational speed so that the target value is obtained. The duty (ON duty) of the energization control signal is determined and output to the linear solenoid valve.

一方、コントロールユニット７は、図３のフローチャートに示すようにして前記可変バルブタイミング機構６の異常診断を行う。尚、応答異常診断手段及び定常偏差異常診断手段としての機能は、前記図３のフローチャートに示すように、コントロールユニット７がソフトウェア的に備えており、応答異常診断は図１に示すような基本構成によって行われる。図３のフローチャートにおいて、ステップＳ１（図中にはＳ１と記してある。以下同様）では、診断条件が成立しているか否かを判別する。 On the other hand, the control unit 7 performs an abnormality diagnosis of the variable valve timing mechanism 6 as shown in the flowchart of FIG. The function as the response abnormality diagnosis means and the steady deviation abnormality diagnosis means is provided in the control unit 7 as software as shown in the flowchart of FIG. 3, and the response abnormality diagnosis has a basic configuration as shown in FIG. Is done by. In the flowchart of FIG. 3, in step S1 (denoted as S1 in the figure, the same applies hereinafter), it is determined whether or not a diagnosis condition is satisfied.

ここで、実際の回転位相を検出する回転位相検出手段を構成するクランク角センサ８，カム角センサ９の異常診断がなされてなく、かつ、前記可変バルブタイミング機構６の作動油の温度が所定温度以上であることを診断実行の条件とすることが好ましい。
診断条件が成立しているときには、ステップ２へ進み、カム軸の回転位相の目標値がステップ変化したか否かを判別する。 Here, abnormality diagnosis of the crank angle sensor 8 and the cam angle sensor 9 constituting the rotation phase detection means for detecting the actual rotation phase is not performed, and the temperature of the hydraulic oil of the variable valve timing mechanism 6 is a predetermined temperature. It is preferable that the above is a condition for executing diagnosis.
When the diagnosis condition is satisfied, the process proceeds to step 2 to determine whether or not the target value of the rotational phase of the camshaft has changed stepwise.

そして、目標値がステップ変化したときには、ステップ３へ進み、ステップ変化前後の目標値の差をステップ変化量として演算し、ステップ４では、前記ステップ変化量に応じて、目標値のステップ変化時から応答診断を実行させるまでの時間ｔｄを設定する（図４参照）。
そして、ステップ５，ステップ６では、前記時間ｔｄを、前記リニアソレノイドバルブの電源電圧、前記可変バルブタイミング機構６の作動油の温度に応じて補正設定して、前記時間ｔｄを最終的に決定する。 When the target value changes stepwise, the process proceeds to step 3, and the difference between the target values before and after the step change is calculated as the step change amount. In step 4, the target value is changed from the time of the step change according to the step change amount. A time td until response diagnosis is executed is set (see FIG. 4).
In Steps 5 and 6, the time td is corrected and set according to the power supply voltage of the linear solenoid valve and the temperature of the hydraulic oil of the variable valve timing mechanism 6, and the time td is finally determined. .

前記ステップ変化量が大きいときほど前記時間ｔｄは長く設定され、また、電源電圧が低いときほど、作動油の温度が低いときほど前記時間ｔｄはより長く補正される。
ステップ７では、目標値のステップ変化があった時点から前記時間ｔｄだけ経過したか否かを判別する。
目標値のステップ変化時から時間ｔｄが経過した時点でステップ８へ進み、そのときの目標値と、前記クランク角センサ８，カム角センサ９の検出信号に基づいて検出される実際の回転位相との偏差の絶対値が、所定値以上であるか否かを判別し、前記偏差の絶対値が所定値以上であるときには、ステップ９へ進んで、応答異常を判定する。 The time td is set longer as the step change amount is larger, and the time td is corrected longer as the power supply voltage is lower and the hydraulic oil temperature is lower.
In step 7, it is determined whether or not the time td has elapsed since the time point when the target value changed stepwise.
When the time td has elapsed since the step change of the target value, the process proceeds to step 8, and the target value at that time and the actual rotational phase detected based on the detection signals of the crank angle sensor 8 and the cam angle sensor 9 It is determined whether or not the absolute value of the deviation is greater than or equal to a predetermined value. If the absolute value of the deviation is greater than or equal to the predetermined value, the process proceeds to step 9 to determine a response abnormality.

即ち、前記偏差の絶対値が所定値以上であるときには、ステップ変化量，電源電圧，油温の条件を考慮して設定された時間ｔｄが経過しても、実際の回転位相が目標値に追い付いていないことになり、可変バルブタイミング機構６における応答性劣化の発生が推定されることになる（図４参照）。
応答異常がステップ９で判定されると、ステップ14へ進み、前記通電制御信号のデューティ（ＯＮデューティ）を最遅角側である０％に固定するようにする。 That is, when the absolute value of the deviation is equal to or greater than a predetermined value, the actual rotational phase catches up with the target value even when the time td set in consideration of the conditions of the step change amount, the power supply voltage, and the oil temperature has elapsed. Therefore, the occurrence of responsiveness deterioration in the variable valve timing mechanism 6 is estimated (see FIG. 4).
If a response abnormality is determined in step 9, the process proceeds to step 14, and the duty (ON duty) of the energization control signal is fixed to 0% which is the most retarded angle side.

尚、上記では、前記時間ｔｄをステップ変化量，電源電圧，油温に応じて変化させることで、これらの条件による応答性の違いを考慮して応答異常の診断が精度良く行えるようにしたが、前記時間ｔｄに代えて又は前記時間ｔｄと共に、前記ステップ８における所定値を、ステップ変化量，電源電圧，油温に応じて変化させる構成としても良い。
即ち、ステップ変化量が大きく、電源電圧，油温が低いときには、比較的大きな偏差が生じても、応答異常と診断されないように、前記所定値を大きく変更する構成とすれば良い。 In the above, the time td is changed in accordance with the step change amount, the power supply voltage, and the oil temperature, so that the response abnormality can be diagnosed with high accuracy in consideration of the difference in response due to these conditions. Instead of the time td or together with the time td, the predetermined value in step 8 may be changed according to the step change amount, the power supply voltage, and the oil temperature.
That is, when the step change amount is large and the power supply voltage and the oil temperature are low, the predetermined value may be greatly changed so that a response abnormality is not diagnosed even if a relatively large deviation occurs.

一方、ステップ７で目標値のステップ変化から時間ｔｄが経過した時点でないと判断されると、ステップ10へ進み、目標値のステップ変化から時間ｔｄを越える時間が経過しているか否かを判断し、時間ｔｄを越える時間が経過しているときにはステップ11へ進む。
ステップ11では、前記クランク角センサ８，カム角センサ９の検出信号に基づいて検出される実際の回転位相の変化が所定値以下であって、略安定している状態であるか否かを判別する。 On the other hand, if it is determined in step 7 that the time td has not elapsed since the step change in the target value, the process proceeds to step 10 to determine whether or not a time exceeding the time td has elapsed from the step change in the target value. When the time exceeding the time td has elapsed, the process proceeds to step 11.
In step 11, it is determined whether or not the actual rotational phase change detected based on the detection signals of the crank angle sensor 8 and the cam angle sensor 9 is not more than a predetermined value and is substantially stable. To do.

そして、実際の回転位相が安定している状態であるときには、ステップ12へ進み、目標値とそのときの実際の回転位相との偏差の絶対値が、所定値以上であるか否かを判別する。
前記偏差の絶対値が所定値以上であるときには、ステップ13へ進んで、定常偏差異常を判定し（図４参照）、ステップ14へ進む。 When the actual rotational phase is stable, the process proceeds to step 12, and it is determined whether or not the absolute value of the deviation between the target value and the actual rotational phase at that time is greater than or equal to a predetermined value. .
When the absolute value of the deviation is greater than or equal to a predetermined value, the routine proceeds to step 13, where a steady deviation abnormality is determined (see FIG. 4), and the routine proceeds to step 14.

尚、前記ステップ12で所定値と比較する目標値とそのときの実際の回転位相との偏差に基づいて、制御目標を学習補正するなどの制御を実行させるようにしても良い。   It should be noted that control such as learning correction of the control target may be executed based on the deviation between the target value to be compared with the predetermined value in step 12 and the actual rotational phase at that time.

本発明に係る応答異常診断の基本構成を示すブロック図。 The block diagram which shows the basic composition of the response abnormality diagnosis which concerns on this invention . 実施の形態における内燃機関のシステム構成図。1 is a system configuration diagram of an internal combustion engine in an embodiment. 前記実施の形態における自己診断制御の様子を示すフローチャート。The flowchart which shows the mode of the self-diagnosis control in the said embodiment. 可変バルブタイミング機構の応答特性を示すタイムチャート。The time chart which shows the response characteristic of a variable valve timing mechanism.

符号の説明Explanation of symbols

１…内燃機関、２…スロットルバルブ、３…吸気バルブ、４…排気バルブ、５…吸気側カム軸、６…可変バルブタイミング機構、７…コントロールユニット、８…クランク角センサ、９…カム角センサ、１０…エアフローメータ DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Throttle valve, 3 ... Intake valve, 4 ... Exhaust valve, 5 ... Intake side camshaft, 6 ... Variable valve timing mechanism, 7 ... Control unit, 8 ... Crank angle sensor, 9 ... Cam angle sensor 10 ... Air flow meter

Claims (6)

カム軸の回転位相を変化させてバルブタイミングを変化させる内燃機関用可変バルブタイミング機構の自己診断装置であって、
前記カム軸の回転位相を検出する回転位相検出手段と、
少なくとも前記回転位相検出手段が正常であることを条件とする診断条件が成立するときに、前記カム軸の回転位相の目標値が変化してから所定時間が経過した時点において、前記回転位相検出手段で検出された回転位相と前記変化後の目標値との偏差が所定値未満であるときに前記可変バルブタイミング機構の応答が正常であると判定し、前記偏差が前記所定値以上のときに前記可変バルブタイミング機構の応答が異常であると判定して異常時処理を実行する応答異常診断手段と、
前記カム軸の回転位相の目標値が変化してから前記所定時間経過後であって、前記応答異常診断手段が前記可変バルブタイミング機構の応答が正常であると判定していて、かつ、前記診断条件が成立する場合に、前記回転位相検出手段で検出される回転位相の変化が所定値以下で、かつ、前記回転位相検出手段で検出された回転位相とそのときの回転位相の目標値との偏差が所定値以上であると、前記可変バルブタイミング機構に定常偏差異常が生じていると判定する定常偏差異常診断手段と、
を含んで構成されたことを特徴とする内燃機関用可変バルブタイミング機構の自己診断装置。 A self-diagnosis device for a variable valve timing mechanism for an internal combustion engine that changes a valve timing by changing a rotational phase of a camshaft,
Rotational phase detection means for detecting the rotational phase of the camshaft;
At least when a predetermined condition elapses after the target value of the rotational phase of the camshaft changes when a diagnostic condition is satisfied that at least the rotational phase detection unit is normal, the rotational phase detection unit It is determined that the response of the variable valve timing mechanism is normal when the deviation between the rotational phase detected in step 1 and the target value after the change is less than a predetermined value, and the deviation is greater than or equal to the predetermined value. A response abnormality diagnosis means for determining that the response of the variable valve timing mechanism is abnormal and executing processing at the time of abnormality;
The response abnormality diagnosis means determines that the response of the variable valve timing mechanism is normal after the predetermined time has elapsed since the target value of the rotational phase of the camshaft has changed, and the diagnosis When the condition is satisfied, the change of the rotation phase detected by the rotation phase detection means is not more than a predetermined value, and the rotation phase detected by the rotation phase detection means and the target value of the rotation phase at that time A steady deviation abnormality diagnostic means for determining that a steady deviation abnormality has occurred in the variable valve timing mechanism when the deviation is equal to or greater than a predetermined value ;
A self-diagnosis device for a variable valve timing mechanism for an internal combustion engine, comprising: 前記定常偏差異常診断手段が、前記応答異常診断手段で応答が正常であると判定された場合に、前記応答異常診断手段による応答異常診断に続けて定常偏差異常診断を実施することを特徴とする請求項１記載の内燃機関用可変バルブタイミング機構の自己診断装置。 When the steady deviation abnormality diagnosis unit determines that the response is normal by the response abnormality diagnosis unit, the steady deviation abnormality diagnosis is performed following the response abnormality diagnosis by the response abnormality diagnosis unit. 2. A self-diagnosis device for a variable valve timing mechanism for an internal combustion engine according to claim 1. 前記応答異常診断手段が、前記所定時間と前記所定値との少なくとも一方を、前記目標値のステップ変化量に応じて変更することを特徴とする請求項１又は２記載の内燃機関用可変バルブタイミング機構の自己診断装置。 The response abnormality diagnosis means, at least one of the predetermined value and the predetermined time, according to claim 1 or 2 for an internal combustion engine valve timing according and changes in response to the step change of the target value Mechanism self-diagnosis device. 前記可変バルブタイミング機構が油圧によってカム軸の回転位相を変化させる構成であって、前記応答異常診断手段が、前記可変バルブタイミング機構の作動油の温度が所定温度以上であるときにのみ、応答異常の診断を行うことを特徴とする請求項１〜３のいずれか１つに記載の内燃機関用可変バルブタイミング機構の自己診断装置。 The variable valve timing mechanism is configured to change the rotational phase of the camshaft by hydraulic pressure, and the response abnormality diagnosis means responds abnormally only when the temperature of the hydraulic oil of the variable valve timing mechanism is equal to or higher than a predetermined temperature. The self-diagnosis device for a variable valve timing mechanism for an internal combustion engine according to any one of claims 1 to 3 . 前記可変バルブタイミング機構が油圧によってカム軸の回転位相を変化させる構成であって、前記応答異常診断手段が、前記所定時間と前記所定値との少なくとも一方を、前記可変バルブタイミング機構の作動油の温度に応じて変更することを特徴とする請求項１〜３のいずれか１つに記載の内燃機関用可変バルブタイミング機構の自己診断装置。 The variable valve timing mechanism is configured to change the rotational phase of the camshaft by hydraulic pressure, and the response abnormality diagnosis means determines at least one of the predetermined time and the predetermined value as the hydraulic oil of the variable valve timing mechanism. The self-diagnosis device for a variable valve timing mechanism for an internal combustion engine according to any one of claims 1 to 3 , wherein the self-diagnosis device is changed according to temperature. 前記可変バルブタイミング機構が油圧によってカム軸の回転位相を変化させる構成であって、油圧をリニアソレノイドバルブで制御する構成であり、前記応答異常診断手段が、前記所定時間と前記所定値との少なくとも一方を、前記リニアソレノイドバルブの電源電圧に応じて変更することを特徴とする請求項１〜５のいずれか１つに記載の内燃機関用可変バルブタイミング機構の自己診断装置。 The variable valve timing mechanism is configured to change the rotational phase of the camshaft by hydraulic pressure, and is configured to control the hydraulic pressure with a linear solenoid valve, and the response abnormality diagnosis means includes at least the predetermined time and the predetermined value. one of the self-diagnosis apparatus for an internal combustion engine variable valve timing mechanism according to any one of claims 1-5, characterized in that to change according to the power supply voltage of the linear solenoid valve.
JP2005165055A 2005-06-06 2005-06-06 Self-diagnosis device for variable valve timing mechanism for internal combustion engine Expired - Lifetime JP4092343B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005165055A JP4092343B2 (en) 2005-06-06 2005-06-06 Self-diagnosis device for variable valve timing mechanism for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005165055A JP4092343B2 (en) 2005-06-06 2005-06-06 Self-diagnosis device for variable valve timing mechanism for internal combustion engine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP15537197A Division JP3822950B2 (en) 1997-06-12 1997-06-12 Self-diagnosis device for variable valve timing mechanism for internal combustion engine

Publications (2)

Publication Number Publication Date
JP2005299677A JP2005299677A (en) 2005-10-27
JP4092343B2 true JP4092343B2 (en) 2008-05-28

Family

ID=35331467

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005165055A Expired - Lifetime JP4092343B2 (en) 2005-06-06 2005-06-06 Self-diagnosis device for variable valve timing mechanism for internal combustion engine

Country Status (1)

Country Link
JP (1) JP4092343B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4596481B2 (en) * 2006-08-30 2010-12-08 株式会社デンソー Variable valve timing control device for internal combustion engine
JP4852560B2 (en) * 2008-02-29 2012-01-11 本田技研工業株式会社 Device for detecting deterioration of responsiveness of control target

Also Published As

Publication number Publication date
JP2005299677A (en) 2005-10-27

Similar Documents

Publication Publication Date Title
CN106662030B (en) Abnormality diagnostic device and abnormality diagnostic method for supercharger
JP3822950B2 (en) Self-diagnosis device for variable valve timing mechanism for internal combustion engine
JP2011190778A (en) Control device for internal combustion engine
JP2006214439A (en) Evaluating system of variable valve performance
US7673599B2 (en) Valve timing control device for an internal combustion engine
US8024109B2 (en) Abnormality determination apparatus for intake amount control mechanism
US7513229B2 (en) Apparatus for and method of controlling variable valve mechanism
JPH10227235A (en) Valve timing controller for internal combustion engine
US8126637B2 (en) Control system for internal combustion engine
JP4092343B2 (en) Self-diagnosis device for variable valve timing mechanism for internal combustion engine
JP2006336566A (en) Controller for variable cylinder engine
KR100833786B1 (en) Method for diagonsing valve of variable valve timing apparatus
JP4478179B2 (en) Device for learning the reference position of an intake valve of an internal combustion engine
KR101646386B1 (en) Method and system for deecting malfunction of fastening bolt in cvvt
JP3752387B2 (en) Diagnosis device for hydraulic variable valve timing mechanism
JP3577945B2 (en) Abnormal diagnosis device for valve train of internal combustion engine
JP5720855B2 (en) Control device for internal combustion engine
JP4424372B2 (en) Actuator control device
US7389681B2 (en) Method for monitoring a camshaft adjustment of an internal combustion engine
JP2004360548A (en) Control device for internal combustion engine
JP3905109B2 (en) Control device for internal combustion engine
JP2011132884A (en) Method for detecting failure of internal combustion engine
JPH11257137A (en) Fuel injection controller of engine
JP2009002258A (en) Variable valve timing control device of control of internal combustion engine
KR102163784B1 (en) Emergency control method and system of Continuously Variable Valve Duration Engine

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20071120

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080121

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080219

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080303

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110307

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110307

Year of fee payment: 3

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110307

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120307

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130307

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140307

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140307

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150307

Year of fee payment: 7

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term