FRAGRANCE SYSTEM

To provide a fragrance system for supplying fragrance so as to reliably keep a target state of a driver.SOLUTION: A #j-th fragrance, as fragrance for sleepiness prevention, is discharged for five minutes from a time point t1 to a time point t2 after detecting sleepiness of a driver. Then, when the sleepiness of the driver is detected again at a time point t3, a sleepiness elimination effect of the previous #j-th fragrance is determined to be insufficient because an elapsed time being three minutes from the time point t2 of discharge end of the previous fragrance is shorter. Then, a (#j+1)-th fragrance different from the previous fragrance, as fragrance for sleepiness prevention, is discharged for five minutes from the time point t3 to a time point t4. When the sleepiness of the driver is subsequently detected again at a time point t5, the previously discharged (#j+1)-th fragrance is determined to have a sleepiness elimination effect since an elapsed time being 10 minutes from the time point T4 of discharge end of the previous fragrance is longer. Then, the (#j+1)-th fragrance being the same as the previous one is discharged.SELECTED DRAWING: Figure 5 【課題】目的とする運転者の状態を信頼性高く維持できるように芳香を供給する「芳香システム」を提供する【解決手段】転者の眠気を検知し時刻ｔ１からｔ２までの５分間、眠気防止用の芳香として#j番目の芳香を放出した後、時刻ｔ３において再度運転者の眠気を検知した場合、前回の芳香の放出終了時点ｔ２からの経過時間が３分と短いので、前回の芳香の眠気解消の効果が不充分であったと判断し、眠気防止用の芳香として前回と異なる#j+1番目の芳香を放出時刻ｔ３からｔ４までの５分間放出する。その後、時刻ｔ５において、再度運転者の眠気を検知した場合、前回の芳香の放出終了時点ｔ４からの経過時間が１０分と比較的長いので、前回放出した芳香に眠気解消の効果があったと判断し、前回と同じ#j+1番目の芳香を放出する。【選択図】図５