CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

• Main Author: MURATA SEIYA
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2017
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

PROBLEM TO BE SOLVED: To provide a control device which can make an internal combustion engine capable of switching liquid fuel and gas fuel as fuel used in an operation sufficiently impart negative pressure to a brake booster.SOLUTION: When brake boost pressure becomes lower than a prescribed value (NO-determination at step ST3) at an operation of an engine (step ST5) which uses gas fuel at the completion of a warmup operation (NO-determination at step ST2), an operation is switched to an operation using liquid fuel from an operation using the gas fuel (step ST4). By this constitution, a situation that the gas fuel pressurizes the inside of an intake passage is eliminated, intake negative pressure can be sufficiently secured, and negative pressure which acts on a brake booster is sufficiently secured.SELECTED DRAWING: Figure 3 【課題】運転に使用する燃料として液体燃料と気体燃料とが切り替え可能な内燃機関に対し、ブレーキブースタに十分な負圧を作用させることができる制御装置を提供する。【解決手段】暖機運転の完了後（ステップＳＴ２でＮＯ判定）における気体燃料を使用したエンジンの運転時（ステップＳＴ５）、ブレーキブースト圧が所定値未満となった場合には（ステップＳＴ３でＮＯ判定）、気体燃料を使用した運転から液体燃料を使用した運転に切り替える（ステップＳＴ４）。これにより、気体燃料が吸気通路内を加圧する状況を解消して、吸入負圧が十分に確保できるようにし、ブレーキブースタに作用する負圧を十分に確保する。【選択図】図３