JP2001234775A5

JP2001234775A5 -

Info

Publication number: JP2001234775A5
Application number: JP2001005738A
Authority: JP
Filing date: 2001-01-12
Publication date: 2004-11-11

Description

【００１６】
したがって請求項４の発明では、リッチスパイクと併せて、エンジントルクを低減させる点火時期の変更制御が実行され、その結果、エンジントルクの増大要因と減少要因とが同時に生じるので、リッチスパイクによるエンジントルクの増大もしくは変動が抑制される。
また、請求項５に記載した発明は、空燃比を大きくしたリーンバーン運転中の所定の時期に空燃比を一時的に減少させるリッチスパイクを実行して排気通路中のＮＯ x 吸収剤からＮＯ x を放出させるエンジンに、変速時の摩擦係合装置の油圧を、検出されたエンジントルクに基づいて設定する自動変速機が連結されたエンジンおよび自動変速機の制御装置において、前記リッチスパイクを実行する際に点火時期を変更する手段と、前記油圧を設定するべく検出された前記エンジントルク値を、前記リッチスパイクと前記点火時期の変更とを実行することによるエンジントルクの変動量に応じて補正する補正手段とを備えていることを特徴とするものである。
したがって請求項５の発明では、リッチスパイクと併せて点火時期の変更制御が実行される。そのため、エンジントルクはリッチスパイクによる増大と点火時期の変更による低下とを生じたトルクとなるが、補正手段は、このような変動を生じているエンジントルクに応じて、油圧を設定するべく検出したトルクを補正する。その結果、このようにして得られたエンジントルクに基づいて設定された油圧は、自動変速機に入力されるトルクに適合したものとなり、変速ショックが防止され、また摩擦係合装置の滑りなどによる耐久性の低下が防止される。
さらに、請求項６に記載した発明は、空燃比を大きくしたリーンバーン運転中の所定の時期に空燃比を一時的に減少させるリッチスパイクを実行して排気通路中のＮＯ x 吸収剤からＮＯ x を放出させるエンジンに、変速時の摩擦係合装置の油圧を、検出されたエンジントルクに基づいて設定する自動変速機が連結されたエンジンおよび自動変速機の制御装置において、前記リッチスパイクを実行する際に燃料噴射量を変更する手段と、前記油圧を設定するべく検出された前記エンジントルク値を、前記リッチスパイクと前記燃料噴射量の変更とを実行することによるエンジントルクの変動量に応じて補正する補正手段とを備えていることを特徴とするものである。
したがって請求項６の発明では、リッチスパイクと併せて燃料噴射量の変更制御が実行される。そのため、エンジントルクはリッチスパイクおよび燃料噴射量の変更により変動したトルクとなるが、補正手段は、このような変動を生じるエンジントルクに応じて、油圧を設定するべく検出したトルクを補正する。その結果、このようにして得られたエンジントルクに基づいて設定された油圧は、自動変速機に入力されるトルクに適合したものとなり、変速ショックが防止され、また摩擦係合装置の滑りなどによる耐久性の低下が防止される。
そして、請求項７に記載した発明は、請求項４または５の発明において、前記リッチスパイクを実行する際の点火時期の変更が、前記リッチスパイクの実行開始から遅らせて実行するものであることを特徴とするものである。
したがって請求項７の発明では、空燃比をリーンからリッチに変更し、あるいはリッチからリーンに変更する場合に、リッチスパイクを実行する際の点火時期が、リッチスパイクの実行開始から遅れて変更される。そのため、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態が未然に回避される。
また、請求項８に記載した発明は、請求項４または５の発明において、前記リッチスパイクを実行する際の点火時期の変更が、前記リッチスパイクの実行開始から徐々に変更させるものであることを特徴とするものである。
したがって請求項８の発明では、空燃比をリーンからリッチに変更し、あるいはリッチからリーンに変更する場合に、リッチスパイクの実行開始から点火時期が徐々に変更される。そのため、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態が未然に回避される。
さらに、請求項９に記載した発明は、請求項６の発明において、前記リッチスパイクを実行する際の燃料噴射量の変更が、前記リッチスパイクの実行開始時に燃料噴射量を増大させるものであることを特徴とするものである。
したがって請求項９の発明では、空燃比をリーンからリッチに変更する場合に、リッチスパイクの実行開始時に燃料噴射量が増大する。そのため、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態が未然に回避される。
そして、請求項１０に記載した発明は、請求項６の発明において、前記リッチスパイクを実行する際の燃料噴射量の変更が、前記リッチスパイクの実行終了時に燃料噴射量を減少させるものであることを特徴とするものである。
したがって請求項１０の発明では、空燃比をリッチからリーンに変更する場合に、リッチスパイクの実行終了時に燃料噴射量が減少する。そのため、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態が未然に回避される。
そしてさらに、請求項１１に記載した発明は、請求項１ないし１０のいずれかの発明において、前記変速時が、いずれかの摩擦係合装置を解放し、かつ他の摩擦係合装置を係合させて実行するクラッチ・ツウ・クラッチ変速の変速時であることを特徴とするものである。
したがって請求項１１の発明では、そのクラッチ・ツウ・クラッチ変速の際に、変速に関与する摩擦係合装置の油圧を調圧するにあたり、入力トルクが外乱の影響を排除した状態で正確に検出され、あるいは検出かつ補正される。そのため、入力トルクに適した油圧に調圧されるので、変速ショックが防止され、また摩擦係合装置の滑りなどによる耐久性の低下が防止される。 [0016]
Therefore, according to the fourth aspect of the present invention, the ignition timing change control for reducing the engine torque is executed together with the rich spike. As a result, the increase and decrease of the engine torque occur simultaneously. Increase or fluctuation is suppressed.
Further, according to the invention described in claim 5, by performing the rich spike that temporarily reduces the air-fuel ratio to a predetermined timing during the lean burn operation with an increased air-fuel ratio in the exhaust passage the NO x absorbent from the NO x The above-described rich spike is executed in an engine and an automatic transmission control device in which an automatic transmission that sets the hydraulic pressure of a friction engagement device at the time of shifting based on the detected engine torque to an engine that releases gears. Means for changing the ignition timing, and correcting the engine torque value detected to set the oil pressure according to the amount of change in engine torque caused by executing the rich spike and the change of the ignition timing. And a correcting means.
Therefore, in the invention of claim 5, control for changing the ignition timing is executed together with the rich spike. For this reason, the engine torque is a torque that causes an increase due to the rich spike and a decrease due to the change in the ignition timing, and the correction unit detects the setting of the oil pressure according to the engine torque that has caused such a change. Correct the torque. As a result, the hydraulic pressure set based on the engine torque obtained in this manner is adapted to the torque input to the automatic transmission, so that shift shock is prevented, and slippage of the friction engagement device is caused. A decrease in durability is prevented.
Further, Claim 6 invention described is, NO from the NO x absorbent in the exhaust passage by performing the rich spike that temporarily reduces the air-fuel ratio to a predetermined timing during the lean burn operation with an increased air-fuel ratio x The above-described rich spike is executed in an engine and an automatic transmission control device in which an automatic transmission that sets the hydraulic pressure of a friction engagement device at the time of shifting based on the detected engine torque to an engine that releases gears. Means for changing the fuel injection amount at the time, the engine torque value detected to set the oil pressure, the rich spike and the change in the fuel injection amount according to the amount of change in the engine torque by executing the change of the fuel injection amount And a correcting means for correcting.
Therefore, in the invention of claim 6, the change control of the fuel injection amount is executed together with the rich spike. Therefore, the engine torque is a torque that fluctuates due to the change in the rich spike and the fuel injection amount, and the correction unit corrects the detected torque to set the oil pressure according to the engine torque that causes such a fluctuation. As a result, the hydraulic pressure set based on the engine torque obtained in this manner is adapted to the torque input to the automatic transmission, so that shift shock is prevented, and slippage of the friction engagement device is caused. A decrease in durability is prevented.
According to a seventh aspect of the present invention, in the invention of the fourth or fifth aspect, the change of the ignition timing at the time of executing the rich spike is executed with a delay from the start of the execution of the rich spike. It is a feature.
Therefore, in the invention of claim 7, when the air-fuel ratio is changed from lean to rich or from rich to lean, the ignition timing at the time of executing the rich spike is changed with a delay from the start of the execution of the rich spike. . Therefore, a situation in which the air-fuel ratio and the ignition timing transiently become incompatible with each other and the fluctuation of the engine output torque becomes large can be avoided.
According to an eighth aspect of the present invention, in the invention of the fourth or fifth aspect, the change of the ignition timing at the time of executing the rich spike is made to gradually change from the start of the execution of the rich spike. It is a feature.
Therefore, in the invention of claim 8, when the air-fuel ratio is changed from lean to rich or from rich to lean, the ignition timing is gradually changed from the start of execution of the rich spike. Therefore, a situation in which the air-fuel ratio and the ignition timing transiently become incompatible with each other and the fluctuation of the engine output torque becomes large can be avoided.
According to a ninth aspect of the present invention, in the invention of the sixth aspect, the change of the fuel injection amount at the time of executing the rich spike increases the fuel injection amount at the start of the execution of the rich spike. It is characterized by the following.
Therefore, according to the ninth aspect of the invention, when the air-fuel ratio is changed from lean to rich, the fuel injection amount increases at the start of execution of the rich spike. Therefore, a situation in which the air-fuel ratio and the ignition timing transiently become incompatible with each other and the fluctuation of the engine output torque becomes large can be avoided.
According to a tenth aspect of the present invention, in the invention according to the sixth aspect, the change of the fuel injection amount at the time of executing the rich spike decreases the fuel injection amount at the end of the execution of the rich spike. It is characterized by the following.
Therefore, according to the tenth aspect, when the air-fuel ratio is changed from rich to lean, the fuel injection amount is reduced at the end of execution of the rich spike. Therefore, a situation in which the air-fuel ratio and the ignition timing transiently become incompatible with each other and the fluctuation of the engine output torque becomes large can be avoided.
Further, according to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, at the time of the shift, one of the friction engagement devices is released and the other friction engagement device is engaged. This is characterized in that the clutch-to-clutch shift is executed during shifting.
Therefore, according to the eleventh aspect of the present invention, at the time of the clutch-to-clutch shift, in adjusting the oil pressure of the friction engagement device involved in the shift, the input torque is accurately detected in a state where the influence of the disturbance is eliminated, Alternatively, it is detected and corrected. Therefore, since the pressure is adjusted to a hydraulic pressure suitable for the input torque, a shift shock is prevented, and a decrease in durability due to slippage of the friction engagement device is prevented.

【００７８】
したがってリッチスパイクの制御開始時点に遅れて燃焼室１３１内の空燃比が小さくなる。そのためリッチスパイクの制御開始と同時に点火時期を変更すると、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなることが考えられる。このような事態を未然に回避するために、空燃比をリーンからリッチに変更し、あるいはリッチからリーンに変更する場合に、点火時期を空燃比の変更に遅らせて変更し、あるいは点火時期を徐々に変更することが好ましい。あるいは空燃比をリーンからリッチに変更する場合に、壁面への燃料の付着を補うように制御開始時に燃料噴射量を増大させ、またリッチからリーンに変更する場合、壁面からの燃料の離脱によるリッチ化を補うように制御開始時に燃料噴射量を減少させることが好ましい。これらの空燃比を切り換える場合の過渡的な制御は、特開平６−１９３４８７号公報に具体的に記載されている。[0078]
Therefore, the air-fuel ratio in the combustion chamber 131 decreases with delay from the start of the rich spike control. Therefore, if the ignition timing is changed at the same time as the start of the rich spike control, the air-fuel ratio and the ignition timing may transiently become incompatible, and the fluctuation of the engine output torque may increase. In order to avoid such a situation beforehand, when changing the air-fuel ratio from lean to rich, or from rich to lean, change the ignition timing to a later change in the air-fuel ratio, or gradually change the ignition timing. It is preferable to change to. Alternatively, when the air-fuel ratio is changed from lean to rich, the fuel injection amount is increased at the start of control so as to compensate for the adhesion of fuel to the wall surface. preferably a reduction of Serco fuel injection quantity control start to compensate for reduction. The transient control when the air-fuel ratio is switched is specifically described in Japanese Patent Application Laid-Open No. 6-193487.

【０１０５】
そして、請求項４の発明では、リッチスパイクと併せて、エンジントルクを低減させる点火時期の変更制御が実行され、その結果、エンジントルクの増大要因と減少要因とが同時に生じるので、リッチスパイクによるエンジントルクの増大もしくは変動を防止もしくは抑制することができる。
また、請求項５の発明では、エンジントルクに基づいて設定された油圧が、自動変速機に入力されるトルクに適合したものとなり、変速ショックを防止することができ、また摩擦係合装置の滑りなどによる耐久性の低下を防止することができる。
さらに、請求項６の発明では、リッチスパイクと併せて燃料噴射量の変更制御が実行され、それに伴ってエンジントルクが幾分なりとも変動するが、補正手段が、このような変動を生じるエンジントルクに応じて、油圧を設定するべく検出したトルク値を補正するので、このようにして得られたエンジントルクに基づいて設定された油圧は、自動変速機に入力されるトルクに適合したものとなり、変速ショックを防止でき、また摩擦係合装置の滑りなどによる耐久性の低下を防止することができる。
そして、請求項７の発明では、空燃比をリーンからリッチに変更し、あるいはリッチからリーンに変更する場合に、リッチスパイクを実行する際の点火時期が、リッチスパイクの実行開始から遅れて変更されるので、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態を未然に回避することができる。
また、請求項８の発明では、空燃比をリーンからリッチに変更し、あるいはリッチからリーンに変更する場合に、リッチスパイクの実行開始から点火時期が徐々に変更されるので、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態を未然に回避することができる。
さらに、請求項９の発明では、空燃比をリーンからリッチに変更する場合に、リッチスパイクの実行開始時に燃料噴射量が増大するので、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態を未然に回避することができる。
そして、請求項１０の発明では、空燃比をリッチからリーンに変更する場合に、リッチスパイクの実行終了時に燃料噴射量が減少するので、過渡的に空燃比と点火時期とが不適合状態となり、エンジン出力トルクの変動が大きくなるというような事態を未然に回避することができる。
そしてさらに、請求項１１の発明では、クラッチ・ツウ・クラッチ変速の際に、変速に関与する摩擦係合装置の油圧を調圧するにあたり、入力トルクが外乱の影響を排除した状態で正確に検出され、あるいは検出かつ補正されるため、入力トルクに適した油圧に調圧されるので、変速ショックを防止でき、また摩擦係合装置の滑りなどによる耐久性の低下を防止することができる。 [0105]
According to the fourth aspect of the present invention, the ignition timing change control for reducing the engine torque is executed together with the rich spike, and as a result, the increase factor and the decrease factor of the engine torque occur simultaneously. An increase or a change in torque can be prevented or suppressed.
According to the fifth aspect of the present invention, the hydraulic pressure set based on the engine torque is adapted to the torque input to the automatic transmission, so that a shift shock can be prevented, and the frictional engagement device can be prevented from slipping. It is possible to prevent a decrease in durability due to the above.
Further, in the invention of claim 6, the control for changing the fuel injection amount is executed in conjunction with the rich spike, and the engine torque fluctuates somewhat with the control. In accordance with the above, the detected torque value is corrected to set the oil pressure, so that the oil pressure set based on the engine torque obtained in this way is adapted to the torque input to the automatic transmission, Shift shock can be prevented, and a decrease in durability due to slippage of the friction engagement device can be prevented.
In the invention of claim 7, when the air-fuel ratio is changed from lean to rich or from rich to lean, the ignition timing at the time of executing the rich spike is changed with a delay from the start of the execution of the rich spike. Therefore, it is possible to avoid a situation where the air-fuel ratio and the ignition timing transiently become incompatible with each other, and the fluctuation of the engine output torque becomes large.
According to the invention of claim 8, when the air-fuel ratio is changed from lean to rich or from rich to lean, the ignition timing is gradually changed from the start of execution of the rich spike, so that the air-fuel ratio is transiently changed. And the ignition timing are incompatible with each other, and the situation where the engine output torque fluctuates greatly can be avoided beforehand.
Further, according to the ninth aspect of the invention, when the air-fuel ratio is changed from lean to rich, the fuel injection amount increases at the start of execution of the rich spike. It is possible to avoid such a situation that the fluctuation of the output torque becomes large.
According to the tenth aspect of the invention, when the air-fuel ratio is changed from rich to lean, the fuel injection amount is reduced at the end of execution of the rich spike. It is possible to avoid such a situation that the fluctuation of the output torque becomes large.
According to the eleventh aspect of the present invention, at the time of clutch-to-clutch shift, in adjusting the hydraulic pressure of the friction engagement device involved in the shift, the input torque is accurately detected in a state where the influence of disturbance is eliminated. Alternatively, since the pressure is detected and corrected, the pressure is adjusted to a hydraulic pressure suitable for the input torque, so that a shift shock can be prevented and a decrease in durability due to slippage of the friction engagement device can be prevented.

Claims

NOx is released from the NOx absorbent in the exhaust passage by executing a rich spike that temporarily reduces the air-fuel ratio at a predetermined time during the lean burn operation in which the air-fuel ratio of the air-fuel mixture supplied to the engine is increased, and An engine that performs control to suppress an increase in engine torque due to the rich spike, and sets an oil pressure of a friction engagement device during gear shifting in an automatic transmission connected to the engine based on the detected engine torque; In the transmission control device,
A control device for an engine and an automatic transmission, comprising: a rich spike inhibiting means for inhibiting a rich spike that temporarily reduces the air-fuel ratio while detecting the engine torque.

The control device for an engine and an automatic transmission according to claim 1, further comprising means for changing a control amount of the rich spike according to whether or not the rich spike is prohibited.

NOx is released from the NOx absorbent in the exhaust passage by executing a rich spike that temporarily reduces the air-fuel ratio at a predetermined time during the lean burn operation in which the air-fuel ratio of the air-fuel mixture supplied to the engine is increased, and An engine that performs control to suppress an increase in engine torque due to the rich spike, and sets an oil pressure of a friction engagement device during gear shifting in an automatic transmission connected to the engine based on the detected engine torque; In the transmission control device,
Means for correcting the engine torque value detected to set the oil pressure according to the amount of change in engine torque caused by executing the rich spike. apparatus.

The engine and automatic transmission according to any one of claims 1 to 3, wherein the control for suppressing an increase in engine torque due to the rich spike is a control for changing an ignition timing so as to reduce the engine torque. Machine control device.

At a predetermined time during the lean burn operation in which the air-fuel ratio is increased, a rich spike that temporarily reduces the air-fuel ratio is executed to execute NO in the exhaust passage. x NO from absorbent x In an engine and an automatic transmission control device in which an automatic transmission that sets the oil pressure of a friction engagement device at the time of shifting based on the detected engine torque is connected to an engine that releases
Means for changing the ignition timing when performing the rich spike,
Correction means for correcting the engine torque value detected to set the oil pressure in accordance with the amount of change in the engine torque by executing the rich spike and the change of the ignition timing; and
A control device for an engine and an automatic transmission, comprising:

At a predetermined time during the lean burn operation in which the air-fuel ratio is increased, a rich spike that temporarily reduces the air-fuel ratio is executed to execute NO in the exhaust passage. x NO from absorbent x In an engine and an automatic transmission control device in which an automatic transmission that sets the oil pressure of a friction engagement device at the time of shifting based on the detected engine torque is connected to an engine that releases
Means for changing the fuel injection amount when performing the rich spike,
Correction means for correcting the engine torque value detected to set the oil pressure according to the amount of change in engine torque by executing the rich spike and the change of the fuel injection amount; and
A control device for an engine and an automatic transmission, comprising:

The control device for the engine and the automatic transmission according to claim 4 or 5, wherein the change of the ignition timing at the time of executing the rich spike is executed with a delay from the start of the execution of the rich spike.

The control device for the engine and the automatic transmission according to claim 4 or 5, wherein the change of the ignition timing at the time of executing the rich spike is made to gradually change from the start of the execution of the rich spike.

The change in the fuel injection amount at the time of executing the rich spike is caused by the change in the rich spike. The control device for an engine and an automatic transmission according to claim 6, wherein the fuel injection amount is increased at the start of execution of the spike.

The control apparatus for the engine and the automatic transmission according to claim 6, wherein the change of the fuel injection amount at the time of executing the rich spike is to decrease the fuel injection amount at the end of the execution of the rich spike. .

4. The clutch according to claim 1, wherein the shift is a clutch-to-clutch shift executed by releasing one of the friction engagement devices and engaging the other friction engagement device. A control device for an engine and an automatic transmission according to any one of claims 10 to 13.