INTERNAL COMBUSTION ENGINE VARIABLE VALVE TIMING CONTROL DEVICE

• Main Authors: SHIDA YUKITOSHI, URUSHIBATA HARUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 20.06.2016
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

PROBLEM TO BE SOLVED: To accurately calculate an actual VCT phase even when reverse rotation occurs while an engine is being stopped (in a period in the course of the rotation of the engine being stopped).SOLUTION: While an engine is being stopped, an actual VCT phase is calculated on the basis of a cam angle signal and a crank angle signal. At this time, when the engine rotates normally, the actual VCT phase is calculated on the basis of a phase difference between a specific cam angle signal and the crank angle signal at an advanced crank angle position A at input timing of the crank angle signal at the advanced crank angle position A after the specific cam angle signal is input. On the other hand, when the engine rotates reversely, the actual VCT phase is calculated on the basis of a phase difference between the specific cam angle signal and the crank angle signal at a retarded crank angle position B at input timing of the crank angle signal at the retarded crank angle position B after the specific cam angle signal is input.SELECTED DRAWING: Figure 3 【課題】エンジン停止途中（エンジンの回転が停止する過程の期間）に逆回転が発生しても実ＶＣＴ位相を精度良く算出できるようにする。【解決手段】エンジン停止途中にカム角信号とクランク角信号とに基づいて実ＶＣＴ位相を算出する。その際、エンジン正回転時には、特定のカム角信号の入力後の進角側のクランク角位置Ａのクランク角信号の入力タイミングで、特定のカム角信号と進角側のクランク角位置Ａのクランク角信号との位相差に基づいて実ＶＣＴ位相を算出する。一方、エンジン逆回転時には、特定のカム角信号の入力後の遅角側のクランク角位置Ｂのクランク角信号の入力タイミングで、特定のカム角信号と遅角側のクランク角位置Ｂのクランク角信号との位相差に基づいて実ＶＣＴ位相を算出する。【選択図】図３