SUPERCHARGING PRESSURE CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

• Main Authors: NAGAI MASAKATSU, SAITO YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 24.10.2019
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

To suppress an influence of a variation between machine differences resulting from a constitution of a link mechanism, in the constitution in which a WGV and a WGV actuator are connected to each other via a four-node type link mechanism.SOLUTION: A link mechanism is constituted of a driven rotating shaft 16, a prime mover rotating shaft 20, an ACT lever 22, a prime mover pin 24, a rod 26, a driven pin 28 and a WGV lever 30. In order to take into consideration a variation between machine differences resulting from a constitution of the link mechanism, a link ratio is defined by the following formula (1). Link ratio=(Lwg/Lact)*(sinβ/sinα) ...(1). Here, Lwg is a length of the WGV lever 30, Lact is a length of the ACT lever 22, α is an angle formed of the WGV lever 30 and the rod 26, and β is an angle formed of the ACT lever 22 and the rod 26. A current value inputted into a DC motor is corrected by using a correction coefficient which is obtained by dividing an actual link ratio by a target link ratio.SELECTED DRAWING: Figure 4 【課題】ＷＧＶとＷＧＶアクチュエータとが４節型のリンク機構を介して連結される構成において、リンク機構の構成に起因した機差間ばらつきの影響を抑える。【解決手段】従動回転軸１６、原動回転軸２０、ＡＣＴレバー２２、原動ピン２４、ロッド２６、従動ピン２８およびＷＧＶレバー３０は、リンク機構を構成する。リンク機構の構成に起因した機差間ばらつきを考慮するため、下記式（１）によりリンク比を定義する。リンク比＝（Ｌｗｇ／Ｌａｃｔ）＊（ｓｉｎβ／ｓｉｎα） ・・・（１）ただし、ＬｗｇはＷＧＶレバー３０の長さであり、ＬａｃｔはＡＣＴレバー２２の長さであり、αはＷＧＶレバー３０とロッド２６がなす角度であり、βはＡＣＴレバー２２とロッド２６がなす角度である。実リンク比を目標リンク比で除した補正係数を用いて、ＤＣモータに入力する電流値を補正する。【選択図】図４