CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

• Main Authors: FUJITA YASUSHI, UNO MASATO
• Format: Patent
• Language: English; Japanese
• Published: 19.07.2018
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BLASTING; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To reduce the pressure in a negative pressure chamber of a brake booster even in the event of an abnormality of a vacuum pump.SOLUTION: A CPU 92 determines whether a vacuum pump 80 is abnormal on the basis of pressure Pb in a negative pressure chamber 52 of a brake booster 50. When determining that the vacuum pump 80 is abnormal, the CPU 92 performs following control: that is, in the operation of a fuel injection valve 16 to control an air-fuel ratio in a combustion chamber 22 to a target air-fuel ratio, a high-pressure fuel pump 34 is operated to fix injection pressure to a maximum value, so that the injection pressure is increased than normal.SELECTED DRAWING: Figure 1 【課題】バキュームポンプの異常時においてもブレーキブースタの負圧室内の圧力を低くすることができる。【解決手段】ＣＰＵ９２は、ブレーキブースタ５０の負圧室５２内の圧力Ｐｂに基づきバキュームポンプ８０の異常の有無を判定する。そしてＣＰＵ９２は、バキュームポンプ８０に異常があると判定する場合、燃焼室２２内の空燃比を目標空燃比に制御するために燃料噴射弁１６を操作する際、高圧燃料ポンプ３４を操作して噴射圧を最大値に固定することによって、通常時よりも上昇させる。【選択図】図１