| 摘要 |
<p>PURPOSE:To reduce production of an uncomfortable feeling due to the change of working noise of a solenoid valve by specifying a duty ratio when the number of revolution is below a given value and a load is below a given value. CONSTITUTION:When it is decided that an engine load is below a given value, it is decided whether the read number of revolutions of an engine is below a given value. When the number of revolutions of an engine 1 is below a given value and a load is below a given value, namely, during low rotation low load running, such as during idle running, the duty ratio of a duty solenoid valve 6 is specified by means of a duty ratio fixing means 75. This constitution prevents the change of working noise of the duty solenoid valve 6 and reduces production of an uncomfortable feeling imparted on a drive and a fellow passenger.</p> |
