To reduce a sound generated when an exhaust valve is switched from a closed state to an open state.SOLUTION: When an exhaust valve is switched from a closed state to an open state, air of a high pressure existing around the exhaust valve is immediately exhausted to ambient air (of an ambient pressure), and in that case, a large sound is generated. It is considered that the large sound is generated when a difference between a pressure of air around the exhaust valve and an ambient pressure is large. When this exhaust valve opening time control program is executed therefor, a pressure of air around the exhaust valve is reduced before the exhaust valve is switch from a closed state to an open state. As a result, a sound, which is generated when the exhaust valve is switched from a closed state to an open state, can be reduced.SELECTED DRAWING: Figure 10
【課題】排気弁を閉から開に切り換える際に発生させられる音を小さくすることである。【解決手段】排気弁が閉から開に切り換えられる際には、排気弁の周辺に存在する高圧のエアが直ちに大気(大気圧である)に排気されるが、その場合に大きな音が発生させられる。大きな音は、排気弁の周辺のエアの圧力と大気圧との圧力差が大きい場合に発生させられると考えられる。それに対して、本排気弁開時制御プログラムが実行された場合には、排気弁が閉から開に切り換えられる前に排気弁の周辺のエアの圧力が低くされる。その結果、排気弁が閉から開に切り換えられる際に発生させられる音を小さくすることができる。【選択図】図10
EXHAUST VALVE OPENING TIME CONTROL PROGRAM
排気弁開時制御プログラム
2019-03-14
Patent
Electronic Resource
Japanese
IPC: | B60G VEHICLE SUSPENSION ARRANGEMENTS , Radaufhängungen und Federungen für Fahrzeuge |
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