| 摘要 |
PURPOSE:To improve a fuel consumption characteristic particularly in a high speed zone by reducing the valve opening period of an intake valve at the time of carrying out a constant speed traveling control even in a high speed zone, in a control for varying an intake air charging rate by reducing the valve opening period in a low speed zone while increasing the valve opening period in a high speed zone. CONSTITUTION:A valve driving mechanism 1 has a low speed cam 2 which reduce the valve opening period of an intake valve and a high speed cam 3 which increases the valve opening period and the cam for driving the intake valve is switched by means of an actuator 4. In this case, the actuator 4 is controlled by a controller 5 according to an engine speed information from an engine speed sensor 6 and an operation mode signal indicating whether the automatic control of constant speed traveling is under way or not from a constant speed traveling device 7. That is, the actuator 4 is controlled so as to select the low speed cam 2 when an engine is judged in a low speed zone while to select the high speed cam 3 when judged in a high speed zone, and to select the low speed cam 2 when the engine is in the high speed zone while the constant speed traveling control is under way.
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