JPH03294642A - Control device for engine - Google Patents
Control device for engineInfo
- Publication number
- JPH03294642A JPH03294642A JP9340090A JP9340090A JPH03294642A JP H03294642 A JPH03294642 A JP H03294642A JP 9340090 A JP9340090 A JP 9340090A JP 9340090 A JP9340090 A JP 9340090A JP H03294642 A JPH03294642 A JP H03294642A
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- water temperature
- engine
- temperature
- fail safe
- 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.)
- Granted
Links
- 239000000498 cooling water Substances 0.000 claims abstract description 47
- 239000007858 starting material Substances 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000005856 abnormality Effects 0.000 abstract description 3
- 239000010720 hydraulic oil Substances 0.000 description 13
- 239000002826 coolant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、エンジンの冷却水温検出回路に異常が発生し
た場合にエンジン冷却水温を推定する制御装置に関する
。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a control device that estimates engine cooling water temperature when an abnormality occurs in an engine cooling water temperature detection circuit.
（従来の技術）
エンン゛ンの温度状態を知るパラメータとしてエンノン
冷却水温が検出され、点火時期制御、燃料供給量制御お
よび吸気量制御等に用いられ、始動性および暖機時の運
転性を確保している。(Prior technology) Engine cooling water temperature is detected as a parameter to know the temperature state of the engine, and is used for ignition timing control, fuel supply amount control, intake air amount control, etc. to ensure startability and drivability during warm-up. are doing.
そのため、エンジン冷却水温センサ等の検出回路に異常
が生して、実際のエンジン冷却水温の検出ができなくな
った場合、エンノン冷却水温を推定するようになってい
た（例えば特開昭５８−１７２４４４号公報参照）。Therefore, when an abnormality occurs in a detection circuit such as an engine coolant temperature sensor and the actual engine coolant temperature cannot be detected, the Ennon coolant temperature is estimated (for example, in Japanese Patent Laid-Open No. 58-172444). (see official bulletin).
従来、例えば第５図に示すように、エンジン冷却水温セ
ンサ等が故障した場合、始動時の初期冷却水温を２０°
Ｃと推定し、スタータスイッチがＯＦＦとなってからの
経過時間が所定の３４５秒後に８０℃まで上昇するよう
になっている。Conventionally, for example, as shown in Figure 5, if an engine coolant temperature sensor or the like fails, the initial coolant temperature at startup is set to 20 degrees.
C, and the temperature rises to 80° C. after a predetermined time of 345 seconds after the starter switch is turned off.
（発明が解決しようとする課題）
しかしながら、寒冷地等において始動時の冷却水温が２
０°Ｃを大幅に低下した場合でも、上記従来装置ではエ
ンノン冷却水温センサ等の故障時に始動時の冷却水温を
２０°Ｃに固定するので、始動時および暖機時の燃料増
量が不足し、運転性が損なわれ、エンスト等を招く心配
があった。(Problem to be solved by the invention) However, in cold regions etc., the cooling water temperature at startup is 2.
Even if the temperature drops significantly below 0°C, the conventional device described above fixes the cooling water temperature at startup to 20°C in the event of failure of the Ennon cooling water temperature sensor, etc., resulting in insufficient fuel increase during startup and warm-up. There was a concern that drivability would be impaired and the engine stalled.
本発明は、こうした従来の問題点に着目して、エンジン
冷却水温検出回路の故障時に、フェールセーフ用冷却水
温を的確に推定することを目的とする。The present invention focuses on these conventional problems and aims to accurately estimate the fail-safe cooling water temperature when the engine cooling water temperature detection circuit fails.
（問題点を解決するための手段）
上記目的を達成するため本発明では、エンジンの回転を
作動流体を介して伝えるトルクコンバータを備えるエン
ジンにおいて、第１図に示すように、トルクコンバータ
の作動流体温度を検出する手段１と、この検出された作
動流体温度をスタータスイッチがＯＮになった際にフェ
ールセーフ用冷却水温の初期値とする推定手段２と、こ
の初期値に基づいてスタータスイッチがＯＦＦになって
からの経過時間に応じてフェールセーフ用冷却水温を計
算する手段３と、冷却水温検出回路の故障を判定してフ
ェールセーフ用冷却水温を出力する判定手段４とを設け
た。(Means for Solving the Problems) In order to achieve the above object, the present invention provides an engine equipped with a torque converter that transmits the rotation of the engine through a working fluid, as shown in FIG. Means 1 for detecting temperature; Estimating means 2 for setting the detected working fluid temperature as an initial value of the fail-safe cooling water temperature when the starter switch is turned on; Based on this initial value, the starter switch is turned off. There are provided means 3 for calculating the fail-safe cooling water temperature according to the elapsed time since the temperature has passed, and determining means 4 for determining the failure of the cooling water temperature detection circuit and outputting the fail-safe cooling water temperature.
（作用）
トルクコンバータの作動流体温度とエンジン冷却水温は
、エンジンを停止し、長時間放置後、または十分暖機し
た後の再始動時はほぼ等しい温度になっている。(Operation) The working fluid temperature of the torque converter and the engine cooling water temperature are approximately equal when the engine is stopped and left for a long time, or when the engine is restarted after being sufficiently warmed up.
本発明は、エンジン冷却水温検出回路の故障時に、トル
クコンバータの作動流体温度をエンノン始動時に検出し
てフェールセーフ用のエンノン始動時冷却水温として用
いるとともに、始動後も経過時間に基づいてフェールセ
ーフ用冷却水温を計算することにより、的確なフェール
セーフ用冷却水温が得られ、冷間始動時から暖機時に渡
って燃料の増量や点火時期の進角制御を的確に行うこと
が可能となり、エンジンの運転性が維持される。The present invention detects the working fluid temperature of the torque converter when the engine cooling water temperature detection circuit fails, and uses it as the engine cooling water temperature at the time of starting the engine for fail-safe purposes. By calculating the cooling water temperature, an accurate fail-safe cooling water temperature can be obtained, and it is possible to increase the amount of fuel and control the advance of the ignition timing from the cold start to the warm-up period, thereby improving engine performance. Drivability is maintained.
（実施例） 以下、本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.
第２図に示すように、車両に搭載されるエンノン１１に
はコントロールユニット１３が備えられ、エンノン冷却
水温信号、スタータスイッチ信号、アクセル開度信号、
エンノン回転数信号等が入力３−
されて、点火時期制御を始め燃料供給量制御等各種運転
制御が行われる。As shown in FIG. 2, the ENON 11 mounted on the vehicle is equipped with a control unit 13, which controls ENON cooling water temperature signals, starter switch signals, accelerator opening signals,
An engine rotation speed signal and the like are inputted to perform various operational controls such as ignition timing control and fuel supply amount control.
エンジン１１と車輪の間に介装されるオートマチックト
ランスミッション（自動変速機）１２には作動油を介し
てエンジン回転をトランスミッション側に伝達するトル
クコンバータ（流体クラッチ）が備えられる。この作動
を制御するコントロールユニット１４は、アクセル開度
信号、走行モード信号およびトルクコンバータの作動油
温度（Ａ／Ｔ油温）の検出信号が入力されて、入力軸回
転信号および出力軸回転信号を出力して所定のタイミン
グで変速ギア位置を切換えるとともに、エンジン側コン
トロールユニット１３との間で点火時期リタード要求信
号および減速度信号あるいは点火時期リタード許可、禁
止信号等の信号交換を行い連携制御により、変速ショッ
クの低減等がはかられている。An automatic transmission 12 interposed between the engine 11 and the wheels is equipped with a torque converter (hydraulic clutch) that transmits engine rotation to the transmission via hydraulic oil. The control unit 14 that controls this operation receives an accelerator opening signal, a driving mode signal, and a detection signal of torque converter hydraulic oil temperature (A/T oil temperature), and outputs an input shaft rotation signal and an output shaft rotation signal. In addition to outputting the output and switching the transmission gear position at a predetermined timing, signals such as an ignition timing retard request signal and a deceleration signal, or an ignition timing retard permission and prohibition signal are exchanged with the engine side control unit 13, and through cooperative control, Efforts have been made to reduce gear shift shock.
本発明は、エンノン冷却水温検出回路の故障時に冷却水
温を推定するため、エンジン側コントロールユニット１
３には、トランスミッション側コントロールユニット１
４を介してトルクコンバータの作動油温信号が入力され
、この検出された作動油温度をスタータスイッチがＯＮ
になった際に７エールセーフ用冷却水温の初期値と推定
し、この初期値にスタータスイッチがＯＦＦになってか
らの経過時間を積算して始動後のフェールセーフ用冷却
水温を計算し、通常時の冷却水温信号に代えてフェール
セーフ用冷却水温を出力し、これを燃料の増量か点火時
期の進角制御の計算に用いる。The present invention provides an engine-side control unit 1 for estimating the cooling water temperature when the Ennon cooling water temperature detection circuit fails.
3 is the transmission side control unit 1
The hydraulic oil temperature signal of the torque converter is input through 4, and the starter switch turns on the detected hydraulic oil temperature.
7 is estimated to be the initial value of the fail-safe cooling water temperature, and the elapsed time since the starter switch was turned OFF is added to this initial value to calculate the fail-safe cooling water temperature after startup. Instead of the current cooling water temperature signal, a fail-safe cooling water temperature is output, and this is used to calculate whether to increase the amount of fuel or control the advance of ignition timing.
この制御内容を第３図に示すフローチャートに基づいて
説明する。The details of this control will be explained based on the flowchart shown in FIG.
まず水温センサが故障しているか否かを判定し、正常時
は水温センサからの検出信号を読込み、この検出値を出
力する（Ｓ１→Ｓ２→Ｓ３）。First, it is determined whether or not the water temperature sensor is out of order, and when it is normal, the detection signal from the water temperature sensor is read and the detected value is output (S1→S2→S3).
水温センサが故障していると判定された場合は、スター
タスイッチがＯＮとなったときのトルクコンバータの作
動油温信号を読込み、この読込まれた作動油温度をエン
ジン始動時の制御に用いられるフェールセーフ用冷却水
温の初期値とする（Ｓ１→Ｓ４→Ｓ５→Ｓ６→Ｓ７）。If it is determined that the water temperature sensor is malfunctioning, the hydraulic oil temperature signal of the torque converter when the starter switch is turned on is read, and this read hydraulic oil temperature is used to control the failure when starting the engine. Set as the initial value of the safe cooling water temperature (S1→S4→S5→S6→S7).
スタータスイッチがＯＦＦになってからは、フェールセ
ーフ用水温の初期値にスタータスイッチＯＦＦ後の経過
時間を積算し、８０°Ｃを上限としてフェールセーフ用
水温を求め、この計算値を始動後のフェールセーフ冷却
水温として出力する（Ｓ４→Ｓ８→Ｓ９）。After the starter switch is turned OFF, add the elapsed time since the starter switch OFF to the initial value of the fail-safe water temperature to determine the fail-safe water temperature with an upper limit of 80°C. Output as safe cooling water temperature (S4→S8→S9).
このように構成しであり、第４図に示すように、エンジ
ン始動時にトルクコンバータの作動油温度が２０℃の場
合に７二−ルセー７用冷却水温は第４図に実線で示すよ
うにその初期値を２０°Ｃとして３４５秒後に８０℃ま
で上昇し、作動油温度が０℃、−３０°Ｃと低下するの
に伴って破線で示すようにフェールセーフ用冷却水温は
それぞれの初期値を同等に低下させるとともに、８０°
Ｃまで上昇する時間が長くなる。また、作動油温度が２
０°Ｃより高い場合は７ヱールセー７用水温はその初期
値を同等に高めるとともに、８０℃に達する時間が短く
なる。With this structure, as shown in Fig. 4, when the torque converter hydraulic oil temperature is 20°C when the engine is started, the cooling water temperature for the 72-Ruse 7 will change as shown by the solid line in Fig. 4. The initial value is 20°C, and it rises to 80°C after 345 seconds, and as the hydraulic oil temperature decreases to 0°C and -30°C, the fail-safe cooling water temperature changes to its initial value as shown by the broken line. Equally lower and 80°
It takes longer to rise to C. Also, the hydraulic oil temperature is 2
When it is higher than 0°C, the water temperature for 7Erse7 increases its initial value to the same extent, and the time it takes to reach 80°C becomes shorter.
車両に搭載されるオートマチックトランスミッション１
２の作動油温度とエンジン１１の冷却水十分暖機した後
の再始動時は、はぼ等しい温度になっている。Automatic transmission installed in a vehicle 1
The temperature of the hydraulic oil in step 2 and the temperature of the cooling water of the engine 11 at the time of restart after the engine 11 has been sufficiently warmed up are approximately the same.
したがって、冷却水温センサ等の検出回路の故障時は、
オートマチックトランスミッション１２の作動油温度を
エンノン始動時に検出して、始動時のフェールセーフ用
のエンノン冷却水温として用い、始動後は時間経過とと
もに計算された水温を７二−ルセー７用のエンジン冷却
水温として用いることにより、冷間始動時から暖機時に
渡ってエンノン冷却水温に応じた燃料の増量や、α火時
期の進角制御を的確に行うことが可能となり、冷間時の
燃料増量が不足して運転性を損なうことを防止するとと
もに、エンジン１１が十分に暖機した後の再始動時に燃
料供給量が過大となって燃費を悪化させることを防止で
きる。Therefore, when a detection circuit such as a cooling water temperature sensor fails,
The hydraulic oil temperature of the automatic transmission 12 is detected at the time of starting the Ennon and used as the Ennon cooling water temperature for fail-safe purposes at the time of startup, and after starting, the water temperature calculated over time is used as the engine cooling water temperature for the 72-Ruse 7. By using this, it is possible to increase the amount of fuel according to the ennon cooling water temperature from a cold start to the time of warm-up, and to accurately control the advance of the α flame timing, so that there is no shortage of fuel increase during cold times. This prevents impairing drivability due to the engine 11 being sufficiently warmed up, and also prevents fuel consumption from worsening due to an excessive amount of fuel being supplied when the engine 11 is restarted after it has been sufficiently warmed up.
（発明の効果）
以上の通り本発明によれば、トルクコンバータの作動油
温度をエンジン始動時に検出して７工−ルセー７用始動
時冷却水温として用いるとともに、７−
始動後も経過時間に基づいてフェールセーフ用冷却水温
を計算するようにしたため、冷開始動時から暖機時に渡
って燃料の増量や点火時期の進角制御を的確に行うこと
が可能となり、特に極寒時での始動性および暖機性を高
めることができる。(Effects of the Invention) As described above, according to the present invention, the hydraulic oil temperature of the torque converter is detected at the time of engine startup and used as the starting cooling water temperature for the 7-Ruse 7, and also after the engine is started, the temperature is detected based on the elapsed time. Since the fail-safe cooling water temperature is calculated based on the temperature, it is possible to accurately increase the amount of fuel and control the advance of the ignition timing from the cold start to the warm-up period. Warm-up performance can be improved.
第１図は本発明のクレーム対応図、第２図は実施例を示
す構成図、第３図は制御内容を示すフローチャート、第
４図は制御特性図である。第５図は従来例を示す制御特
性図である。
１・・・トルクコンバータの作動油温検出手段、２・・
・７工ールセー７用水温初期値推定手段、３・・・７工
ールセー７用水温計算手段、４・・・故障判定手段。
［６Ｃ１
第４図
ｒ’ｒ１
第
図FIG. 1 is a diagram corresponding to claims of the present invention, FIG. 2 is a configuration diagram showing an embodiment, FIG. 3 is a flowchart showing control contents, and FIG. 4 is a control characteristic diagram. FIG. 5 is a control characteristic diagram showing a conventional example. 1... Torque converter hydraulic oil temperature detection means, 2...
- Water temperature initial value estimating means for the 7th construction circuit 7, 3..7 water temperature calculation means for the 7th construction circuit 7, 4. Failure determination means. [6C1 Figure 4 r'r1 Figure
Claims (1)
バータを備え、このトルクコンバータの作動流体の温度
を検出する手段と、この検出された作動流体温度をスタ
ータスイッチがＯＮになった際にフェールセーフ用冷却
水温の初期値とする推定手段と、この初期値に基づいて
スタータスイッチがＯＦＦになってからの経過時間に応
じてフェールセーフ用冷却水温を計算する手段と、冷却
水温検出回路の故障を判定してフェールセーフ用冷却水
温を出力する判定手段とを設けたことを特徴とするエン
ジンの制御装置。It is equipped with a torque converter that transmits the rotation of the engine through a working fluid, and includes a means for detecting the temperature of the working fluid of this torque converter, and a fail-safe cooling system that uses the detected working fluid temperature when the starter switch is turned on. A means for estimating the water temperature as an initial value, a means for calculating a fail-safe cooling water temperature according to the elapsed time since the starter switch was turned off based on this initial value, and a means for determining a failure of the cooling water temperature detection circuit. 1. A control device for an engine, comprising: determination means for outputting a fail-safe cooling water temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2093400A JP2853886B2 (en) | 1990-04-09 | 1990-04-09 | Engine control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2093400A JP2853886B2 (en) | 1990-04-09 | 1990-04-09 | Engine control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03294642A true JPH03294642A (en) | 1991-12-25 |
| JP2853886B2 JP2853886B2 (en) | 1999-02-03 |
Family
ID=14081250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2093400A Expired - Lifetime JP2853886B2 (en) | 1990-04-09 | 1990-04-09 | Engine control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2853886B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57212345A (en) * | 1981-06-23 | 1982-12-27 | Nippon Denso Co Ltd | Internal-combustion engine control system |
| JPS6022042A (en) * | 1983-07-15 | 1985-02-04 | Nissan Motor Co Ltd | Apparatus for detecting engine temperature |
| JPS61226539A (en) * | 1985-03-29 | 1986-10-08 | Nissan Motor Co Ltd | Fuel supply controller for internal-combustion engine |
| JPS6338624A (en) * | 1986-08-01 | 1988-02-19 | Mazda Motor Corp | Control device for engine with automatic transmission |
-
1990
- 1990-04-09 JP JP2093400A patent/JP2853886B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57212345A (en) * | 1981-06-23 | 1982-12-27 | Nippon Denso Co Ltd | Internal-combustion engine control system |
| JPS6022042A (en) * | 1983-07-15 | 1985-02-04 | Nissan Motor Co Ltd | Apparatus for detecting engine temperature |
| JPS61226539A (en) * | 1985-03-29 | 1986-10-08 | Nissan Motor Co Ltd | Fuel supply controller for internal-combustion engine |
| JPS6338624A (en) * | 1986-08-01 | 1988-02-19 | Mazda Motor Corp | Control device for engine with automatic transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2853886B2 (en) | 1999-02-03 |
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