JPS6043142A - Control method for the time when trouble is caused with differential-pressure sensor used in electronically controlled fuel supplying apparatus - Google Patents
Control method for the time when trouble is caused with differential-pressure sensor used in electronically controlled fuel supplying apparatusInfo
- Publication number
- JPS6043142A JPS6043142A JP15008083A JP15008083A JPS6043142A JP S6043142 A JPS6043142 A JP S6043142A JP 15008083 A JP15008083 A JP 15008083A JP 15008083 A JP15008083 A JP 15008083A JP S6043142 A JPS6043142 A JP S6043142A
- Authority
- JP
- Japan
- Prior art keywords
- pressure sensor
- differential pressure
- engine
- throttle valve
- differential
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
【発明の詳細な説明】
を検出する差圧一センサーを含むエンジンの各種情報に
基づきエンジンに供給されるべき空気流量をコンピュー
タにより作動せしめられるアクチュエ−タにより制御し
て空燃比制御が行なわれ得るように構成した電子制御燃
料供給装置における差圧セ／ザー故障時の制御方法に関
する。DETAILED DESCRIPTION OF THE INVENTION Air-fuel ratio control can be performed by controlling the air flow rate to be supplied to the engine by an actuator operated by a computer based on various information about the engine, including a differential pressure sensor that detects The present invention relates to a control method in the event of a differential pressure sensor failure in an electronically controlled fuel supply system configured as described above.
従来電子制両燃料供給装置と１〜では、例えば特開昭５
７ − ９ ］、 ３ ４ ３号公報による燃料優先
型電子制御撚イｌー１洪給装置が知られているが、これ
を第１図によシ説明すれば、１０はエンジン、１２はス
ロットルバルブ、１４はスロットルバルブのアクチュエ
ータ、１６は態別供給機構，１８は・燃料噴射装置、２
０はアクセルペダル、２２はアクセルペダル２０の位置
センサー、２４はスロットルバルブ１２の上下流間の差
圧を検出する差圧センサー、２６はエンジン回転数を検
出する回転センサー、２８はコンピュータである。この
ように構成された燃料供給装置は差圧センサー２４によ
って検出されたスロットルバルブ１２の上下流間の差圧
を含む各種のエンジン状態に応じてコンピュータ２８に
より空燃比を制御するようになっているが、差圧センサ
ー２４が故障した場合には空燃比がふらついだり非常に
り？チに捷だけ非常にリーンに制御されてしまい、走行
が不安定になり場合によってはエンジンが停止して走行
が不可能になってしまうという事態が発生する。For example, in the conventional electronic control fuel supply system and 1~,
7-9], a fuel priority type electronically controlled twisting l-1 feeding device is known as disclosed in Publication No. 343. This is explained with reference to FIG. 1, where 10 is an engine and 12 is a throttle. 14 is a throttle valve actuator; 16 is a fuel supply mechanism; 18 is a fuel injection device; 2
0 is an accelerator pedal, 22 is a position sensor for the accelerator pedal 20, 24 is a differential pressure sensor that detects the differential pressure between the upstream and downstream sides of the throttle valve 12, 26 is a rotation sensor that detects the engine speed, and 28 is a computer. The fuel supply system configured in this manner controls the air-fuel ratio by the computer 28 according to various engine conditions including the differential pressure between the upstream and downstream sides of the throttle valve 12 detected by the differential pressure sensor 24. However, if the differential pressure sensor 24 fails, the air-fuel ratio may fluctuate or become very low. However, the engine is controlled very leanly, making driving unstable and, in some cases, causing the engine to stop and making driving impossible.
本発明は、以」二の点に鑑み、差圧センサーが故障した
場合にも成る程度の安定した走行が可能であるようにし
た電子制御燃料供給装置における差圧センサー故障時の
制御方法を提供することを目的としており、この目的は
、スロットルバルブの上下流間の差圧を検出する差圧セ
ンサーを含むエンジンの各種情報に基づきエンジンに供
給されるべき空気流量をコンピュータによシ作動せしめ
られるアクチュエータにより制御して空燃・比制御が行
なわれ得るように構成した電子制御燃料供給装置におい
て、エンジン回転数（Ｎ）、−回転当りの燃料供給量（
Ｑ Ｆ ／ Ｎ ）及びスロットルバルブ開度（θ）に
関する特性がＱ Ｆ／Ｎ −Ｎのマツプとしてコンピュ
ータに記憶されており、差圧センサーが故障した場合、
これを検出することにより、差圧センサー出力信号を使
用せずにＮ及び。Ｆ／Ｎから上記マツプに基づき直接的
にθを読出して空燃比制御が行なわれるようにしたこと
を特徴とする差圧センサー故障時の制御方法により達成
される。In view of the following two points, the present invention provides a control method when a differential pressure sensor fails in an electronically controlled fuel supply system, which enables stable driving even when the differential pressure sensor fails. The purpose is to have a computer operate the air flow rate to be supplied to the engine based on various engine information including a differential pressure sensor that detects the differential pressure between the upstream and downstream of the throttle valve. In an electronically controlled fuel supply system configured to perform air-fuel ratio control by controlling an actuator, engine rotation speed (N), - fuel supply amount per rotation (
Characteristics related to QF/N) and throttle valve opening (θ) are stored in the computer as a map of QF/N-N, and if the differential pressure sensor fails,
By detecting this, N and without using the differential pressure sensor output signal. This is achieved by a control method when a differential pressure sensor fails, characterized in that the air-fuel ratio is controlled by directly reading out θ from the F/N based on the above map.
以下に本発明による差圧センサー故障時の制御方法をＨ
；２．明すれば、電子制御燃料供給装置自体の構成は従
来の第１図に示された構成と同じであり、本発明による
制御はすべてコンピュータ２８内で処理される。コンピ
ュータ２８には、エンジンＩｎ＋！え
転１ｆｌ（Ｎ）、−回転当りの燃料供給量（Ｑ Ｐ／Ｎ
）及びスロットルバルブ開度（θ）に関する特性がＱ
Ｆ／Ｎ−Ｎのマツプとして記憶されている。次に第２図
に示されたフローチャートにより本発明による制御方法
を説明すれば、差圧センサーが正常に作動している場合
即ち差圧センサーの故障が検出されない場合、差圧セン
サーの出力信号Ｓに基づいてコンピュータにより空燃比
制御が行なわれるが、差圧センサーの故障が検出される
と、このときの燃料供給ｌ Ｑ Ｆ及びエンジン回転数
Ｎが検出されて一回転当シの燃料供給量ＱＦ／Ｎが演算
され、このＱＦ／ＮとＮから前述のマツプによりスロッ
トルバルブ開度θが読出され、アクチュエータを介して
スロットルバルブの開度をθに調整することにより空燃
比制御が行々われる。この場合ＩＱＦ／Ｎ及びＮに対し
てθそして空気流量ＱＡが一義的に決まってしまうので
、差圧センサーが正常に作動している場合の空気流量に
対して多少の誤差が生ずるが、成る程度の走行は可能で
ある。The method of controlling the differential pressure sensor when it fails according to the present invention is described below.
;2. To be clear, the configuration of the electronically controlled fuel supply system itself is the same as the conventional configuration shown in FIG. 1, and all control according to the present invention is processed within the computer 28. The computer 28 has an engine In+! E-turn 1 fl (N), - fuel supply amount per revolution (Q P/N
) and throttle valve opening (θ).
It is stored as an F/N-N map. Next, the control method according to the present invention will be explained with reference to the flowchart shown in FIG. The air-fuel ratio is controlled by the computer based on the following.If a failure of the differential pressure sensor is detected, the fuel supply lQF and engine rotational speed N at this time are detected and the fuel supply amount per revolution QF is determined. /N is calculated, and the throttle valve opening θ is read out from QF/N and N using the above-mentioned map, and air-fuel ratio control is performed by adjusting the throttle valve opening to θ via the actuator. In this case, since θ and air flow rate QA are uniquely determined for IQF/N and N, there will be some error in the air flow rate when the differential pressure sensor is operating normally, but it will be enough. It is possible to run.
以上述べたように本発明によれば、電子制御１燃刺供給
装置の構造はそのままで、コンピュータのソフトウェア
を変更することにより、差圧センサーが故障した場合、
これを検出することにより一回転当りの燃料供給量及び
エンジン回転数からコンピュータにｈ己１意されている
マツプによりスロットルバルブ開度を読出して、アクチ
ュエータを介してスロットルバルブ開度を調整するよう
にしたから、差圧センサーが故障した場合にも成る程度
の安定した走行が可能になり、このために特別の装置を
要しないため、コストが上昇するこ吉も殆どない等、極
めて効果的である。As described above, according to the present invention, the structure of the electronically controlled fuel sting supply device remains the same, but by changing the computer software, even if the differential pressure sensor fails,
By detecting this, the computer reads out the throttle valve opening based on a map created by the computer based on the amount of fuel supplied per revolution and the engine speed, and adjusts the throttle valve opening via the actuator. Therefore, stable running is possible even if the differential pressure sensor fails, and since no special equipment is required for this, there is almost no risk of increased costs, making it extremely effective. .
尚、コンビニ・−夕に・記憶されるマツプとしては、他
のマツプでもよく、その場合、マツプがら読出された情
報により空燃比制御が行なわれ得る。また、以上の説明
では燃料優先型電子制御燃料供給装置について述べたが
、これに限らず他の形式の電子制御燃料供給装置に本発
明を適用し得ることはいうまでもない。It should be noted that the map stored in the convenience store may be any other map, and in that case, the air-fuel ratio can be controlled based on the information read from the map. Further, in the above description, the fuel priority type electronically controlled fuel supply system has been described, but it goes without saying that the present invention is not limited to this and can be applied to other types of electronically controlled fuel supply systems.
第１図は燃料優先型電子制御燃料供給装置の概略図、第
２図は本発明による制御方法のフローチャートである。
１０ エンジン、１２ スロットルバルブ、１／１・・
・アクチュ予−タ、１６ 燃ポ」供給機’ｔｆ＆、］、
８・燃料噴射装置、２ｏ・・・アクセルペダル、２２
位置センサー、２４ ・差圧センサー、２６ 回転セ
ン”）−−＋２８・・・コンピュータ。FIG. 1 is a schematic diagram of a fuel priority type electronically controlled fuel supply system, and FIG. 2 is a flowchart of a control method according to the present invention. 10 engine, 12 throttle valve, 1/1...
・Actuator, 16 fuel supply unit 'tf&, ],
8. Fuel injection device, 2o... accelerator pedal, 22
Position sensor, 24 ・Differential pressure sensor, 26 Rotation sensor")--+28... Computer.
Claims (1)
サーを含むエンジンの各種情報に基づきエン・ジンに供
給されるべき空気流量をコンピュータにより作動せしめ
られるアクチュエータにより制御して空燃比制御を行な
われ得るように構成した電子制御燃料供給装置において
、 エンジン回転数（Ｎ）、−回転当りの燃料供給Ｗ−（Ｑ
Ｆ ／ Ｎ ）及びスロットルバルブ開度（θ）に関
する特性がＱＦ／Ｎ−Ｎのマツプとしてコンピュータに
記憶されており、差圧センサーが故障した場合、これを
検出することにより、差圧センサー出力信号を使用せず
にＮ・及びＱＦ／Ｎから上記マツプに基づき直接的にθ
を読出して空燃費制御が行なわれるようにしたことを特
徴とする、差圧センサート１女障時の制御方法。[Claims] The air flow rate to be supplied to the engine is controlled by an actuator operated by a computer based on various engine information including a differential pressure sensor that detects the differential pressure between the upstream and downstream sides of the throttle valve. In an electronically controlled fuel supply system configured to perform air-fuel ratio control, engine rotation speed (N), - fuel supply per rotation W - (Q
Characteristics related to F/N) and throttle valve opening (θ) are stored in the computer as a map of QF/N-N, and if the differential pressure sensor fails, by detecting this, the differential pressure sensor output signal θ directly from N・ and QF/N based on the above map without using
1. A method of controlling differential pressure sensor 1 when a failure occurs, characterized in that air/fuel efficiency control is performed by reading out the following information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15008083A JPS6043142A (en) | 1983-08-17 | 1983-08-17 | Control method for the time when trouble is caused with differential-pressure sensor used in electronically controlled fuel supplying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15008083A JPS6043142A (en) | 1983-08-17 | 1983-08-17 | Control method for the time when trouble is caused with differential-pressure sensor used in electronically controlled fuel supplying apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6043142A true JPS6043142A (en) | 1985-03-07 |
Family
ID=15489073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15008083A Pending JPS6043142A (en) | 1983-08-17 | 1983-08-17 | Control method for the time when trouble is caused with differential-pressure sensor used in electronically controlled fuel supplying apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6043142A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS623148A (en) * | 1985-06-28 | 1987-01-09 | Suzuki Motor Co Ltd | Fuel injection control method |
| WO1999041496A1 (en) * | 1998-02-11 | 1999-08-19 | Bayerische Motoren Werke Aktiengesellschaft | Method for establishing an operating variable to be determined of a motor vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58101244A (en) * | 1981-12-14 | 1983-06-16 | Toyota Motor Corp | Abnormality detecting method and treating method of suction tube pressure signal |
-
1983
- 1983-08-17 JP JP15008083A patent/JPS6043142A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58101244A (en) * | 1981-12-14 | 1983-06-16 | Toyota Motor Corp | Abnormality detecting method and treating method of suction tube pressure signal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS623148A (en) * | 1985-06-28 | 1987-01-09 | Suzuki Motor Co Ltd | Fuel injection control method |
| WO1999041496A1 (en) * | 1998-02-11 | 1999-08-19 | Bayerische Motoren Werke Aktiengesellschaft | Method for establishing an operating variable to be determined of a motor vehicle |
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