System Description

TUMBLE CONTROL VALVE CONTROL

System Description


INPUT/OUTPUT SIGNAL CHART







SYSTEM DESCRIPTION

Tumble control valve has a valve portion in the intake passage of each cylinder.
While idling and during low engine coolant temperature, the tumble control valve closes. Thus the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a tumble in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve fuel consumption, and increase the stability in running conditions.
Also, except when idling and during low engine coolant temperature, this system opens the tumble control valve.
In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow resistance.
The tumble control valve is operated by the ECM.