JPS63120821A - Supercharge device for engine with car-mounted exhaust turbosupercharger - Google Patents

Abstract

PURPOSE:To prevent the generation of a black smoke, by closing an exhaust bypass valve and controlling an engine to be placed in a supercharged condition when a deceleration condition is detected on the basis of an accelerator control, so that the engine eliminates a differential delay of closing of the bypass valve in the time of acceleration after a speed change control. CONSTITUTION:An accelerator control detector 19 is provided corresponding to an accelerator pedal 20, and an output from this detector 19 is input to a driving control circuit 16. That is, a position of the accelerator pedal 20 is checked by the detector 19 at every fixed time, and a CPU22, which inputs information of the checked position, calculates a difference between the detected accelerator position and the checked accelerator position. And the CPU22, which decides an engine to be placed in a deceleration condition when the above difference obtains a negative value, inputs a deceleration signal to the driving control circuit 16. Then the driving control circuit 16, which controls each intake and exhaust bypass valve 14, 15 to be closed through each actuator 17, 18, actuates a supercharger by, for instance, introducing a new charge to a driven gear chamber 4. In this way, the engine is avoided from stopping its supercharge when a speed change control is frequently performed.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、排気タービン過給機を備えたエンジンに関し
、特に機関負荷が比較的低い軽負荷時に過給を休止させ
るようにした排気タービン過給機付きのエンジンに関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine equipped with an exhaust turbine supercharger, and in particular to an exhaust turbine supercharger that suspends supercharging when the engine load is relatively low. Regarding engines with feeders.

（従来技術） 一般に過給機付きのエンジンでは、軽負荷時には過給機
が抵抗になって燃費がかさむことになるから、燃費節減
のう乏から軽負荷時には過給機を切って無過給状態で運
転できるようになっている。(Prior art) Generally, in engines equipped with a supercharger, the supercharger acts as resistance at light loads, increasing fuel consumption. It is in good condition and can be driven.

そして従来は、軽負荷時に過給を停止するようにした過
給装置として、例えば、実公昭５３−４６４０４号公報
に示されたものがある。Conventionally, there is a supercharging device that stops supercharging when the load is light, as disclosed in, for example, Japanese Utility Model Publication No. 53-46404.

これは、エンジンの排気系中に過給機のタービン部分を
短絡する状態でバイパスを形成し、タービン室への排気
路とバイパスとの分岐部分に方向切換弁を配置し、排気
マニホールド内を流れる排気ガスの温度を排気温度検出
器で検出し、その検出温度が高いときには高負荷運転状
態であると判別して作動装置で方向切換弁をタービン室
へ排気を送給する状態に切換え、過給機を作動させるよ
うにし、逆に検出温度が低いときには、軽負荷状態であ
ると判別して方向切換弁をバイパスに排気を流す状態に
切換えることにより、過給機が燃焼室に背圧を与えない
ようにして、吸排気弁のオーバーラツプ期間に排気ガス
が燃焼室へ吹き返さないようにする構造になっている。This creates a bypass in the engine's exhaust system by short-circuiting the turbine section of the supercharger, and a directional control valve is placed at the branch between the exhaust path to the turbine chamber and the bypass, allowing the flow to flow through the exhaust manifold. The temperature of the exhaust gas is detected by an exhaust temperature detector, and when the detected temperature is high, it is determined that high-load operation is in progress, and the actuator switches the directional control valve to the state that sends the exhaust gas to the turbine chamber, thereby generating supercharging. On the other hand, when the detected temperature is low, the turbocharger applies back pressure to the combustion chamber by determining that the load is light and switching the directional control valve to a state where exhaust gas flows into the bypass. The structure is designed to prevent exhaust gas from blowing back into the combustion chamber during the overlap period of the intake and exhaust valves.

（解決しようとする問題点） ところが、排気系中の排気ガス温度で方向切換弁の切換
制御を行なっている従来の過給機付きのエンノンを車輌
に搭載した場合には、変速操作時に排気温度が変化して
、排気バイパスの開閉が頻繁に行なわれることになる。(Problem to be solved) However, when a vehicle is equipped with a conventional supercharger-equipped ennon, which controls the switching of the directional valve based on the exhaust gas temperature in the exhaust system, the exhaust temperature changes during gear shifting. changes, resulting in frequent opening and closing of the exhaust bypass.

この結果、変速操作後の加速操作時に過給機の作動が遅
れ、黒煙が出やすいうえ、排気バイパスを頻繁に切換え
るものでは過給状態の切換えが燃費節減にはならないと
いう問題があった。As a result, the operation of the supercharger is delayed during an acceleration operation after a gear shift operation, and black smoke is likely to be produced.In addition, in a vehicle that frequently switches the exhaust bypass, switching the supercharging state does not reduce fuel consumption.

（解決しようとする問題点） 本発明は、変速操作に伴なう黒煙発生を防止するように
したもので、そのために変速操作の前にはアクセル減速
操作が行なわれることに着目して、排気温度で排気バイ
パスの開閉制御を行なうようにしたものにおいて、アク
セル操作具に対応させてアクセル操作検出手段を配置し
、アクセル操作検出手段がアクセル減速状態を検出する
ことに基づき、バイパス弁を閉弁状態にするように構成
したことを特徴とするものである。(Problems to be Solved) The present invention is designed to prevent the generation of black smoke associated with gear shifting operations, and focuses on the fact that an accelerator deceleration operation is performed before gear shifting operations. In a device in which the opening/closing of the exhaust bypass is controlled based on the exhaust temperature, an accelerator operation detection means is arranged in correspondence with the accelerator operation tool, and the bypass valve is closed based on the accelerator operation detection means detecting the accelerator deceleration state. It is characterized by being configured to be in a valve state.

（作　用） 本発明は、アクセル操作具に対応させてアクセル操作検
出手段を配置し、アクセル操作検出手段がアクセル減速
状態を検出することに基づき、バイパス弁を閉弁状態に
するように構成しであるので、変速操作に伴なう減速蝋
作をアクセル操作検出手段が検出した場合には、バイパ
ス弁を閉状態にし、エンジンを過給状態にする。これに
より、変速操作後の加速時にバイパス弁の閉弁作動遅れ
がなくなり、加速操作時の黒煙発生を防止することにな
る。(Function) The present invention is configured such that an accelerator operation detection means is arranged in correspondence with an accelerator operation tool, and the bypass valve is brought into a closed state based on the accelerator operation detection means detecting an accelerator deceleration state. Therefore, when the accelerator operation detecting means detects deceleration waxing accompanying a gear shift operation, the bypass valve is closed and the engine is supercharged. This eliminates the delay in closing the bypass valve during acceleration after a gear change operation, and prevents the generation of black smoke during an acceleration operation.

（実施例） 第１図は本発明の実施例を示す概略図である。(Example) FIG. 1 is a schematic diagram showing an embodiment of the present invention.

図において、（１）は車輌に搭載されるディーゼルエン
ジン、（２）は吸気ポート、（３）は排気ポート、（Ｃ
）は排気タービン過給機を示し、排気タービン過給機（
Ｃ）の従動羽根車室（４）と吸気ポート（２）とを給気
管（５）で連通させ、この給気管（５）の途中から吸気
バイパス（６）を分岐導出させである。In the figure, (1) is a diesel engine installed in a vehicle, (2) is an intake port, (3) is an exhaust port, (C
) indicates the exhaust turbine supercharger, and the exhaust turbine supercharger (
The driven impeller chamber (4) of C) and the intake port (2) are communicated through an air supply pipe (5), and an intake bypass (6) is branched out from the middle of this air supply pipe (5).

この吸気バイパス（６）は排気タービン過給ｍ＜ｃ＞の
新気吐出口（７）を迂回して排気タービン過給機（Ｃ）
の新気吸込室（８）に連通している。This intake bypass (6) bypasses the fresh air discharge port (7) of the exhaust turbine supercharger m<c> and returns to the exhaust turbine supercharger (C).
It communicates with the fresh air suction chamber (8).

一方、排気タービン過給ｔｆｉ（Ｃ）の駆動羽根車室（
９）と排気ポート（３）とが排気管（１０）で連通させ
てあり、この排気管（１０）の途中から排気バイパス（
１１）を分岐導出させである。この排気バイパス（１１
）は排気タービン過給機（Ｃ）の排気ガス吹込室（１２
）を迂回して、排気タービン過給８！（Ｃ）の排気ガス
吐出室（１３）に連通している。On the other hand, the drive impeller chamber of the exhaust turbine supercharging tfi (C) (
9) and the exhaust port (3) are communicated through an exhaust pipe (10), and an exhaust bypass (
11) is derived in a branched manner. This exhaust bypass (11
) is the exhaust gas blowing chamber (12) of the exhaust turbine supercharger (C).
) and exhaust turbine supercharging 8! It communicates with the exhaust gas discharge chamber (13) in (C).

吸気バイパス（６）と排気バイパス（１１）にはそれぞ
れバイパス弁（１４）（１５）が内装してあり、この各
バイパス弁（１４）（１５）は後述する駆動制御回路（
１６）からの出力で、ソレノイド等の７クチユエータ（
１７）（１８）により開閉操作されるようになっている
。The intake bypass (6) and the exhaust bypass (11) are equipped with bypass valves (14) and (15), respectively, and each bypass valve (14) and (15) is connected to a drive control circuit (described later).
16), the output from 7 actuators (such as solenoids)
17) It is designed to be opened and closed by (18).

排気管（１０）の排気ポート（３）寄り部分には排気ガ
ス温度検出器（１９）が配置してあり、この排気ガス温
度検出器（１９）はバイパス弁（１４）（１５）を開閉
操作するだめの設定温度を検出した際、温度検出信号を
出力するように構成しである。An exhaust gas temperature detector (19) is arranged in the part of the exhaust pipe (10) near the exhaust port (3), and this exhaust gas temperature detector (19) opens and closes the bypass valves (14) and (15). It is configured to output a temperature detection signal when the set temperature of the sudame is detected.

バイパス弁（１４）（１５）の駆動制御回路（１６）は
、前記温度検出信号（Ｋ）を受けてアクチュエータ（１
７）（１８）を駆動制御する駆動信号（Ｄ）を出力する
。即ち、無過給状態において排気温度検出器（１９）が
設定温度（Ｔ）よりも高い温度を検出した場合には、重
負荷であると判断してバイパス弁（１４）（１５）を閉
弁作動させることにより、排気ガスを駆動羽根車室（９
）に導入するとともに、新気を従動羽根車室（４）に導
入して過給機（Ｃ）を作動させる。また、過給状態にお
いて排気温度検出器（１９）が設定温度（Ｔ）よりも、
低い温度を検出することにより、軽負荷であると判断し
てバイパス弁（１４）（１５）を開弁作動させることに
より、排気バイパス（１１）を開通させて排気ガスの主
流が駆動羽根車室（９）を通過しないようにするととも
に、吸気バイパス（６）も開通させて新気の主流が従動
羽根車室（４）を通過しないようにして過給＋ｆｆ１（
Ｃ）を休止させる。なお、この駆動制御回路（１６）に
はエンジンの回転数変動に伴って変動する燃費曲線及び
設定温度とをデーターテーブルとして内部に記憶させて
あり、エンジンの回転数の変化に対応させてバイパス弁
（１４）（１５）の開閉駆動信号（Ｄ）を発するように
しである。A drive control circuit (16) for the bypass valves (14) and (15) receives the temperature detection signal (K) and controls the actuator (1).
7) Output a drive signal (D) to drive and control (18). That is, if the exhaust temperature detector (19) detects a temperature higher than the set temperature (T) in the non-supercharging state, it is determined that the load is heavy and the bypass valves (14) and (15) are closed. By operating the exhaust gas, the drive impeller chamber (9
), and at the same time, fresh air is introduced into the driven impeller chamber (4) to operate the supercharger (C). Also, in the supercharging state, the exhaust temperature detector (19) is lower than the set temperature (T).
By detecting a low temperature, it is determined that the load is light, and by opening the bypass valves (14) and (15), the exhaust bypass (11) is opened and the main flow of exhaust gas is directed to the driving impeller chamber. (9), and also open the intake bypass (6) to prevent the main flow of fresh air from passing through the driven impeller chamber (4).
C) is suspended. Note that this drive control circuit (16) has a data table stored therein containing a fuel efficiency curve and a set temperature that vary with changes in engine speed, and the bypass valve is activated in response to changes in engine speed. (14) The opening/closing drive signal (D) of (15) is generated.

一方、エンジンの回転数を制御するアクセルペダル（２
０）に対応させてボテンシ３センサからなるアクセル捏
作兵（２１）が配置してあり、このアクセル操作検出共
（２１）からの出力が前記駆動制御回路（１６）に入力
するようになっている。On the other hand, the accelerator pedal (2
An accelerator counterfeiter (21) consisting of three potentiometers is arranged in correspondence with the sensor (21), and the output from the accelerator operation detector (21) is input to the drive control circuit (16). There is.

そして、このアクセル操作検出共（２１）で一定時間（
例えばｌｏｍｓ）毎にアクセルペダル（２０）の位置を
チェ・ンクし、その情報をＣＰ　Ｕ　（２２）に入力し
、検出したアクセル位置と直前にチェックしたアクセル
ペダル位置との差を算出し、その差が負の値となった場
合に減速繰作状態であると判断して減速信号（Ｈ）を発
し、その減速信号（Ｈ）を駆動制御回路（１６）に入力
する。Then, this accelerator operation detection (21) is performed for a certain period of time (
For example, the position of the accelerator pedal (20) is checked for each loms), the information is input to the CPU (22), the difference between the detected accelerator position and the accelerator pedal position checked immediately before is calculated, and the When the difference becomes a negative value, it is determined that the deceleration operation is occurring, a deceleration signal (H) is generated, and the deceleration signal (H) is input to the drive control circuit (16).

ｆ５２図はバイパス弁（１４）（１５）の開閉弁制御に
係る制御フロー図であり、アクセル操作検出共（２１）
によるアクセル位置検出によって、減速信号（Ｉ（）が
駆動制御回路（１６）に入力されると、駆動制御回路（
１６）からは、排気温度によるバイパス弁（１４）（１
５）の開閉状態にかかわらず、バイパス弁（１４）（１
５）を閉弁状態におき、過給機は過給状態となる。Figure f52 is a control flow diagram related to the on-off valve control of the bypass valves (14) and (15), including the accelerator operation detection (21).
When the deceleration signal (I()) is input to the drive control circuit (16) by detecting the accelerator position by the
16), a bypass valve (14) (1
5) regardless of whether the bypass valve (14) (1
5) is placed in the closed state, and the supercharger enters the supercharging state.

従って、変速操作時にアクセルペダル（２０）が減速操
作されて排気系中の排気〃ス温度が低下しても、バイパ
ス（６）（ｉｌ）中のバイパス弁（１４）（１５）は閉
弁したままであるから、変速操作後に続けて行なわれる
加速繰作時に過給遅れが生じることはなく、加速操作に
よって黒煙を吐くことがなくなる。Therefore, even if the accelerator pedal (20) is decelerated during a gear shift operation and the exhaust gas temperature in the exhaust system decreases, the bypass valves (14) and (15) in the bypass (6) (il) are closed. Therefore, there will be no supercharging delay during acceleration operations that are performed immediately after the gear shift operation, and no black smoke will be emitted during the acceleration operations.

（効　果） 本発明では、機関負荷の変化に伴なう排気温度の変動を
検出して排気タービン過給機を切換え使用するものにお
いて、アクセル［（％兵に対応させてアクセル操作検出
手段を配置し、このアクセル操作検出手段がアクセル揉
作兵の減速操作を検出することに基づき、バイパス弁を
閉弁作動させるようにしたので、減速操作と加速操作が
短時間のうちに行なわれる変速操作時に、排気温度が設
定温度よりも低くなることがあっても過給休止状態にな
ることがない。これにより、変速操作後の加速操作時で
のバイパス弁のり換え遅れに伴なう黒煙発生を防止する
ことができる。(Effect) The present invention detects fluctuations in exhaust temperature due to changes in engine load and switches the exhaust turbine supercharger. Since the bypass valve is closed based on the accelerator operation detecting means detecting the deceleration operation by the accelerator operator, the speed change operation is such that the deceleration operation and acceleration operation are performed in a short time. Sometimes, even if the exhaust temperature becomes lower than the set temperature, supercharging does not go into a pause state.This prevents the generation of black smoke due to the delay in switching the bypass valve when accelerating after a gear shift operation. can be prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す概要図、第２図はバイ
パス弁開閉制御のフローチャートである。 Ｃ・・・排気タービン過給機、１・・・エンジン、３・
・・排気ポート、１１・・・バイパス、１２・・・（Ｃ
）の排気ガス入口室、１５・・・バイパス弁、１９・・
・排気温度検出器、２０・・・アクセル捉作兵、２１・
・・アクセル操作検出手段。FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart of bypass valve opening/closing control. C...Exhaust turbine supercharger, 1...Engine, 3.
...Exhaust port, 11...Bypass, 12...(C
) exhaust gas inlet chamber, 15...bypass valve, 19...
・Exhaust temperature detector, 20...Accelerator capture unit, 21・
...Accelerator operation detection means.

Claims (1)

【特許請求の範囲】 １、車輌に搭載する排気タービン過給機付きエンジン（
１）の排気ポート（３）と排気タービン過給機（Ｃ）の
排気ガス入口室（１２）との間の排気路部分からバイパ
ス（１１）を分岐状に設け、バイパス（１１）にバイパ
ス弁（１５）を開閉可能に設け、エンジン（１）の排気
系路に排気温度検出器（１９）を設け、排気温度検出器
（１９）が設定温度より高温を検出することに基づき、
バイパス弁（１５）を閉弁作動させて排気タービン過給
器（Ｃ）を作動させ、排気温度検出器（Ｃ）での検出温
度が設定温度よりも低温である間はバイパス弁（１５）
を開弁して排気タービン過給機（Ｃ）を休止させるよう
に構成した車載用排気タービン過給機付きエンジンにお
いて、 アクセル操作具（２０）に対応させてアクセル操作検出
手段（２１）を配置し、アクセル操作検出手段（２１）
がアクセル減速状態を検出することに基づき、バイパス
弁（１５）を閉弁状態にするように構成したことを特徴
とする車載用排気タービン過給機付きエンジンの過給装
置[Claims] 1. An engine with an exhaust turbine supercharger mounted on a vehicle (
A bypass (11) is provided in a branched manner from the exhaust path portion between the exhaust port (3) of 1) and the exhaust gas inlet chamber (12) of the exhaust turbine supercharger (C), and a bypass valve is installed in the bypass (11). (15) is provided so as to be openable and closable, and an exhaust temperature detector (19) is provided in the exhaust system path of the engine (1), and based on the fact that the exhaust temperature detector (19) detects a temperature higher than the set temperature,
The bypass valve (15) is closed to operate the exhaust turbine supercharger (C), and the bypass valve (15) is closed while the temperature detected by the exhaust temperature detector (C) is lower than the set temperature.
In a vehicle-mounted engine with an exhaust turbine supercharger configured to stop the exhaust turbine supercharger (C) by opening the valve, an accelerator operation detection means (21) is arranged in correspondence with an accelerator operation tool (20). and accelerator operation detection means (21)
A supercharging device for an engine equipped with an exhaust turbine supercharger for use in a vehicle, characterized in that the bypass valve (15) is configured to close based on the detection of an accelerator deceleration state.