JP2012092781A - Supercharge control device - Google Patents

Supercharge control device Download PDF

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JP2012092781A
JP2012092781A JP2010242481A JP2010242481A JP2012092781A JP 2012092781 A JP2012092781 A JP 2012092781A JP 2010242481 A JP2010242481 A JP 2010242481A JP 2010242481 A JP2010242481 A JP 2010242481A JP 2012092781 A JP2012092781 A JP 2012092781A
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fuel ratio
air
engine
electric turbocharger
sensor
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JP5691399B2 (en
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Tomoyuki Ito
朝幸 伊藤
Tomohiro Sugano
知宏 菅野
Yoshiyuki Abe
義幸 阿部
Akira Iijima
章 飯島
Yukari Mizushima
由加利 水島
Haruyo Kimura
治世 木村
Isao Kitsukawa
功 橘川
Naoki Ishibashi
直樹 石橋
Shogo Sakashita
翔吾 坂下
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Isuzu Motors Ltd
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    • 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

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  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a supercharge control device capable of improving engine performance.SOLUTION: The supercharge control device includes: an electric turbocharger 3 provided to the engine 1 and capable of performing supercharging or braking regeneration; a control part 4 for controlling the electric turbocharger 3; a storage part 6 for storing the relation among an engine speed, a fuel flow rate, and an air-fuel ratio of exhaust gas as a map; and a λ sensor 5 for detecting the air-fuel ratio of exhaust gas. The control part 4 reads the air-fuel ratio from the map in the storage 6, the air-fuel ratio is set as a target air-fuel ratio, the electric turbocharger 3 is driven to increase boost pressure when the air-fuel ratio detected by the λ sensor 5 is lower than the target air-fuel ratio, and when the detected air-fuel ratio is higher than the target air-fuel ratio, the electric turbocharger 3 performs braking regeneration to lower the boost pressure.

Description

本発明は、エンジンへの吸気を過給する過給制御装置に関するものである。   The present invention relates to a supercharging control device that supercharges intake air into an engine.

一般にエンジンは出力やトルクを上げると排気温度も上がるが、排気温度が過度に高温になった場合、エンジンシステムの劣化やさまざまな環境下で耐久性の問題が生じる。   In general, when the engine output and torque are increased, the exhaust temperature also increases. However, when the exhaust temperature becomes excessively high, the engine system deteriorates and durability problems occur in various environments.

ゆえに、排気温度はいかなる状況下でも排気温度の限界を超えないように設定されている。   Therefore, the exhaust temperature is set so as not to exceed the limit of the exhaust temperature under any circumstances.

なお、エンジンには、組立てのバラツキ、部品のバラツキ、センサのバラツキ等があるため、バラツキによる悪条件が重なった場合でも必要な耐久性を得られるように排気温度の限界は低めに設定されている。   Since the engine has assembly variations, component variations, sensor variations, etc., the exhaust temperature limit is set low so that the required durability can be obtained even if adverse conditions due to variations overlap. Yes.

特開２００６−１７７１７１号公報JP 2006-177171 A 特開平８−１８２３８２号公報JP-A-8-182382

ところで、本発明者は、排気ガスの状態を制御することで、エンジンの燃費、出力、トルク、耐久性等のパフォーマンスを更に向上できることを見出した。   By the way, the present inventor has found that by controlling the state of the exhaust gas, it is possible to further improve performance such as fuel consumption, output, torque, durability and the like of the engine.

そこで、本発明の目的は、上記課題を解決し、エンジンのパフォーマンスを向上できる過給制御装置を提供することにある。   Therefore, an object of the present invention is to provide a supercharging control device that can solve the above-described problems and improve the performance of the engine.

上記課題を解決するために本発明は、エンジンに設けられ過給または制動回生可能な電動ターボチャージャと、該電動ターボチャージャを制御する制御部と、エンジン回転数と燃料流量と排気ガスの空燃比との関係をマップとして記憶する記憶部と、排気ガスの空燃比を検出するλセンサとを備え、前記制御部は、前記記憶部の前記マップから空燃比を読み取り、該空燃比を目標空燃比とし、前記λセンサで検出された検出空燃比が前記目標空燃比より低いとき前記電動ターボチャージャを駆動してブースト圧を上げ、前記検出空燃比が前記目標空燃比より高いとき前記電動ターボチャージャで制動回生させてブースト圧を下げるように構成されたものである。   In order to solve the above-described problems, the present invention provides an electric turbocharger provided in an engine that can be supercharged or brake regenerated, a control unit that controls the electric turbocharger, an engine speed, a fuel flow rate, and an air-fuel ratio of exhaust gas. And a λ sensor that detects the air-fuel ratio of the exhaust gas, and the control unit reads the air-fuel ratio from the map of the storage unit and uses the air-fuel ratio as a target air-fuel ratio. When the detected air-fuel ratio detected by the λ sensor is lower than the target air-fuel ratio, the electric turbocharger is driven to increase the boost pressure, and when the detected air-fuel ratio is higher than the target air-fuel ratio, the electric turbocharger It is configured to reduce the boost pressure by braking regeneration.

本発明によれば、エンジンのパフォーマンスを向上できる。   According to the present invention, engine performance can be improved.

図１はエンジンと過給制御装置の説明図である。FIG. 1 is an explanatory diagram of an engine and a supercharging control device. 図２は過給制御を示す流れ図である。FIG. 2 is a flowchart showing the supercharging control.

図１に示すように、過給制御装置２は、エンジン１に設けられ排気ガスからのエネルギーで過給、または制動回生可能な電動ターボチャージャ３と、電動ターボチャージャ３を制御する制御部４と、制御部４にディーゼルエンジン１等の各種情報を提供するための記憶部６と、制御部４に接続され排気ガスの空燃比を検出するλセンサ（空燃比センサ）５と、制御部４に接続されエンジン回転数を検出する回転数センサ７とを備える。   As shown in FIG. 1, the supercharging control device 2 includes an electric turbocharger 3 that is provided in the engine 1 and can be supercharged or regenerated with energy from exhaust gas, and a control unit 4 that controls the electric turbocharger 3. , A storage unit 6 for providing the control unit 4 with various information such as the diesel engine 1, a λ sensor (air-fuel ratio sensor) 5 connected to the control unit 4 for detecting the air-fuel ratio of the exhaust gas, and the control unit 4 And a rotational speed sensor 7 connected to detect the engine rotational speed.

エンジン１はディーゼルエンジンからなり車両（図示せず）に搭載されている。エンジン１は、エンジン本体１ａに吸気ガスを供給する吸気通路１１を有すると共に、排気ガスを排出する排気通路１２を有する。   The engine 1 comprises a diesel engine and is mounted on a vehicle (not shown). The engine 1 has an intake passage 11 that supplies intake gas to the engine body 1a and an exhaust passage 12 that discharges exhaust gas.

電動ターボチャージャ３は、排気通路１２に設けられ排気ガスにより回転駆動されるタービン１３と、吸気通路１１に設けられタービン１３からの駆動力で吸気ガスを加圧するコンプレッサ１４と、タービン１３の動力をコンプレッサ１４に伝達するタービン軸１５と、タービン軸１５を回転駆動し、またはタービン軸１５からの動力で発電するモータジェネレータ１６とを備える。モータジェネレータ１６には、その出力を調節するためのインバータＩＶが接続されており、インバータＩＶには、放電可能かつ充電可能な電源としてのバッテリ（リチウムイオン電池等）ＢＴが接続されると共に制御部４が接続されている。制御部４は、インバータＩＶを介して電動ターボチャージャ３のモータジェネレータ１６を制御するようになっている。   The electric turbocharger 3 includes a turbine 13 that is provided in the exhaust passage 12 and is driven to rotate by exhaust gas, a compressor 14 that is provided in the intake passage 11 and pressurizes the intake gas by a driving force from the turbine 13, and power of the turbine 13. A turbine shaft 15 that is transmitted to the compressor 14, and a motor generator 16 that rotationally drives the turbine shaft 15 or generates electric power with power from the turbine shaft 15 are provided. An inverter IV for adjusting the output is connected to the motor generator 16, and a battery (lithium ion battery or the like) BT as a power source that can be discharged and recharged is connected to the inverter IV and a control unit. 4 is connected. The control unit 4 controls the motor generator 16 of the electric turbocharger 3 via the inverter IV.

コンプレッサ１４より下流の吸気通路１１には、インタークーラー１７が設けられている。また、タービン１３よりも上流の排気通路１２とコンプレッサ１４よりも下流の吸気通路１１とには、排気ガスを吸気側に還流するためのＥＧＲ装置１８が設けられている。ＥＧＲ装置１８は、吸気通路１１と排気通路１２を接続するＥＧＲ通路１９と、ＥＧＲ通路１９に設けられ排気通路１２から吸気側に還流する排気ガスの量を調節するためのＥＧＲバルブ２０と、ＥＧＲバルブ２０より下流のＥＧＲ通路１９に設けられたＥＧＲクーラー２１とを備える。   An intercooler 17 is provided in the intake passage 11 downstream of the compressor 14. Further, an EGR device 18 for returning exhaust gas to the intake side is provided in the exhaust passage 12 upstream of the turbine 13 and the intake passage 11 downstream of the compressor 14. The EGR device 18 includes an EGR passage 19 that connects the intake passage 11 and the exhaust passage 12, an EGR valve 20 that is provided in the EGR passage 19 and adjusts the amount of exhaust gas recirculated from the exhaust passage 12 to the intake side, and EGR And an EGR cooler 21 provided in the EGR passage 19 downstream from the valve 20.

λセンサ５は、排気マニフォールド２２に取り付けられており、検出した空燃比を制御部４に電気信号として出力するようになっている。   The λ sensor 5 is attached to the exhaust manifold 22 and outputs the detected air-fuel ratio to the control unit 4 as an electric signal.

回転数センサ７は、エンジン１に設けられており、検出したエンジン回転数を制御部４に電気信号として出力するようになっている。   The rotational speed sensor 7 is provided in the engine 1 and outputs the detected engine rotational speed to the control unit 4 as an electrical signal.

制御部４と記憶部６は、ＥＣＭ（エンジンコントロールモジュール）２３に形成されている。記憶部６は、エンジン回転数と、燃料流量と、排気ガスの空燃比との関係をマップ（図示せず）として記憶している。特にマップ中の空燃比は、エンジン回転数及び燃料流量に応じた理想的な空燃比であり、エンジンの運転状態に応じた最適な空燃比である。制御部４は、記憶部６のマップから空燃比を読み取り、この空燃比を目標空燃比として設定し、λセンサ５で検出された空燃比（以下、検出空燃比という）が目標空燃比より低いとき電動ターボチャージャ３を駆動してブースト圧を上げ、検出空燃比が目標空燃比より高いとき電動ターボチャージャ３で制動回生させてブースト圧を下げるように構成されている。   The control unit 4 and the storage unit 6 are formed in an ECM (engine control module) 23. The storage unit 6 stores the relationship among the engine speed, the fuel flow rate, and the air-fuel ratio of the exhaust gas as a map (not shown). In particular, the air-fuel ratio in the map is an ideal air-fuel ratio according to the engine speed and the fuel flow rate, and is an optimal air-fuel ratio according to the operating state of the engine. The control unit 4 reads the air-fuel ratio from the map of the storage unit 6, sets this air-fuel ratio as the target air-fuel ratio, and the air-fuel ratio detected by the λ sensor 5 (hereinafter referred to as the detected air-fuel ratio) is lower than the target air-fuel ratio. In some cases, the electric turbocharger 3 is driven to increase the boost pressure, and when the detected air-fuel ratio is higher than the target air-fuel ratio, the electric turbocharger 3 performs braking regeneration to decrease the boost pressure.

次に過給制御とその作用について説明する。   Next, supercharging control and its operation will be described.

図２に示すように、ステップＳ１にて、エンジン駆動中、制御部４は、回転数センサ７からエンジン回転数を取得すると共に、エンジン運転条件（エンジン回転数、トルク（アクセル開度））で決まる燃料流量を取得し、これらエンジン回転数と燃料流量とに基づいて記憶部６のマップから空燃比を読み取り、この空燃比を目標空燃比として設定する。この後、制御部４は、λセンサ５から空燃比を取得し、この空燃比（検出空燃比）と目標空燃比とを比較する。検出空燃比が目標空燃比より低い場合、ステップＳ２に進む。   As shown in FIG. 2, in step S <b> 1, while the engine is being driven, the control unit 4 acquires the engine rotation speed from the rotation speed sensor 7 and at the engine operating conditions (engine rotation speed, torque (accelerator opening)). The determined fuel flow rate is acquired, the air-fuel ratio is read from the map of the storage unit 6 based on the engine speed and the fuel flow rate, and this air-fuel ratio is set as the target air-fuel ratio. Thereafter, the control unit 4 acquires the air / fuel ratio from the λ sensor 5 and compares the air / fuel ratio (detected air / fuel ratio) with the target air / fuel ratio. If the detected air-fuel ratio is lower than the target air-fuel ratio, the process proceeds to step S2.

ステップＳ２にて、制御部４は、インバータＩＶを介して電動ターボチャージャ３を駆動するように制御してブースト圧を上げる。空燃比は上がり、目標空燃比に近づく。制御部４は、検出空燃比が目標空燃比以上になるまで電動ターボチャージャ３を駆動させ続ける。これにより、空燃比は最適化され、燃焼効率が向上し、エンジン１の出力、トルク、燃費、耐久性等のパフォーマンスが向上する。   In step S2, the control unit 4 controls the electric turbocharger 3 to be driven via the inverter IV to increase the boost pressure. The air-fuel ratio increases and approaches the target air-fuel ratio. The control unit 4 continues to drive the electric turbocharger 3 until the detected air-fuel ratio becomes equal to or higher than the target air-fuel ratio. As a result, the air-fuel ratio is optimized, the combustion efficiency is improved, and the performance of the engine 1, such as the output, torque, fuel consumption, and durability, is improved.

ステップＳ１にて検出空燃比が目標空燃比より高い場合、ステップＳ３に進む。   If the detected air-fuel ratio is higher than the target air-fuel ratio in step S1, the process proceeds to step S3.

ステップＳ３にて、制御部４は、インバータＩＶを介して電動ターボチャージャ３を制御して電動ターボチャージャ３で制動回生させる。すなわち、電動ターボチャージャ３のモータジェネレータ１６で発電すると共に、その電気をバッテリＢＴに充電することでタービン１３及びコンプレッサ１４を制動する。空燃比は下がり、目標空燃比に近づく。制御部４は、検出空燃比が目標空燃比以下になるまで電動ターボチャージャ３で制動回生し続ける。これにより、無駄な過給を防止できると共に排気ガスから無駄なエネルギを回収でき、エンジン１のパフォーマンスを向上できる。   In step S <b> 3, the control unit 4 controls the electric turbocharger 3 via the inverter IV and causes the electric turbocharger 3 to perform brake regeneration. That is, the turbine 13 and the compressor 14 are braked by generating electricity with the motor generator 16 of the electric turbocharger 3 and charging the battery BT with the electricity. The air-fuel ratio decreases and approaches the target air-fuel ratio. The control unit 4 continues to perform brake regeneration with the electric turbocharger 3 until the detected air-fuel ratio becomes equal to or lower than the target air-fuel ratio. Thereby, useless supercharging can be prevented and useless energy can be recovered from the exhaust gas, and the performance of the engine 1 can be improved.

このように、過給制御装置２が、エンジン１に設けられ過給または制動回生可能な電動ターボチャージャ３と、電動ターボチャージャ３を制御する制御部４と、エンジン回転数と燃料流量と排気ガスの空燃比との関係をマップとして記憶する記憶部６と、排気ガスの空燃比を検出するλセンサ５とを備え、制御部４は、記憶部６のマップから空燃比を読み取り、この空燃比を目標空燃比とし、λセンサ５で検出された検出空燃比が目標空燃比より低いとき電動ターボチャージャ３を駆動してブースト圧を上げ、検出空燃比が目標空燃比より高いとき電動ターボチャージャ３で制動回生させてブースト圧を下げるように構成されるものとしたため、空燃比を最適化でき、燃焼効率を向上でき、排気ガスから無駄なエネルギを回収でき、エンジン１のパフォーマンスを向上できる。また、各種部品のバラツキとは無関係に空燃比を最適化でき、エンジン１のパフォーマンスを最大に生かすことができる。   As described above, the supercharging control device 2 includes the electric turbocharger 3 provided in the engine 1 and capable of supercharging or braking regeneration, the control unit 4 that controls the electric turbocharger 3, the engine speed, the fuel flow rate, and the exhaust gas. And a λ sensor 5 for detecting the air-fuel ratio of the exhaust gas. The control unit 4 reads the air-fuel ratio from the map of the storage unit 6, and this air-fuel ratio. Is the target air-fuel ratio, and when the detected air-fuel ratio detected by the λ sensor 5 is lower than the target air-fuel ratio, the electric turbocharger 3 is driven to increase the boost pressure, and when the detected air-fuel ratio is higher than the target air-fuel ratio, the electric turbocharger 3 Since the engine is configured to reduce the boost pressure by braking regeneration, the air-fuel ratio can be optimized, combustion efficiency can be improved, waste energy can be recovered from the exhaust gas, and the engine 1 Can improve performance. In addition, the air-fuel ratio can be optimized regardless of variations in various parts, and the performance of the engine 1 can be maximized.

なお、λセンサ５は、排気マニフォールド２２に取り付けられるものとしたが、排気通路１２の排気管に取り付けられるものとしてもよい。   The λ sensor 5 is attached to the exhaust manifold 22, but may be attached to the exhaust pipe of the exhaust passage 12.

また、制御部４に燃料流量センサを接続し、この燃料流量センサで検出される燃料流量を用いて記憶部６のマップから空燃比を読み取るものとしてもよい。精度向上を図ることができる。   Further, a fuel flow rate sensor may be connected to the control unit 4 and the air-fuel ratio may be read from the map of the storage unit 6 using the fuel flow rate detected by the fuel flow rate sensor. The accuracy can be improved.

１ エンジン
２ 過給制御装置
３ 電動ターボチャージャ
４ 制御部
５ λセンサ
６ 記憶部
７ 回転数センサ DESCRIPTION OF SYMBOLS 1 Engine 2 Supercharging control device 3 Electric turbocharger 4 Control part 5 Lambda sensor 6 Memory | storage part 7 Speed sensor

Claims (1)

エンジンに設けられ過給または制動回生可能な電動ターボチャージャと、該電動ターボチャージャを制御する制御部と、エンジン回転数と燃料流量と排気ガスの空燃比との関係をマップとして記憶する記憶部と、排気ガスの空燃比を検出するλセンサとを備え、前記制御部は、前記記憶部の前記マップから空燃比を読み取り、該空燃比を目標空燃比とし、前記λセンサで検出された検出空燃比が前記目標空燃比より低いとき前記電動ターボチャージャを駆動してブースト圧を上げ、前記検出空燃比が前記目標空燃比より高いとき前記電動ターボチャージャで制動回生させてブースト圧を下げるように構成されたことを特徴とする過給制御装置。   An electric turbocharger provided in the engine and capable of supercharging or braking regeneration, a control unit that controls the electric turbocharger, and a storage unit that stores the relationship among the engine speed, the fuel flow rate, and the air-fuel ratio of the exhaust gas as a map, And a λ sensor for detecting the air-fuel ratio of the exhaust gas, the control unit reads the air-fuel ratio from the map of the storage unit, sets the air-fuel ratio as a target air-fuel ratio, and detects the detected air detected by the λ sensor. The electric turbocharger is driven to increase the boost pressure when the fuel ratio is lower than the target air-fuel ratio, and the boost pressure is decreased by braking regeneration with the electric turbocharger when the detected air-fuel ratio is higher than the target air-fuel ratio. A supercharging control device characterized by that.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN114483343A (en) * 2022-01-12 2022-05-13 东风商用车有限公司 Method and system for improving low-speed air inflow of engine

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