System Description

The intake manifold runner control valve installed at intake manifold generates swirl flow (revolving flow) in combustion chamber, and by that effect air-fuel mixture is homogenized so that stabilizes combustion. The intake manifold runner control valve is driven by DC motor and controlled by ECM.

IDLING, LOW SPEED.SMALL LOAD RANGE 

With intake manifold runner control valve closed the flowing field of swirl flow (revolving flow) is generated by increased flow speed of gas and improves combustion so that enables stable combustion.

Courtesy of NISSAN NORTH AMERICA, INC.

MIDDLE.HIGH SPEED RANGE 

• With intake manifold runner control valve opened the flowing field mainly consist of tumble (vertical revolving flow) by atomizer, port shape and shallow piston head is generated.

  Courtesy of NISSAN NORTH AMERICA, INC.

• Which makes more swirl remained at the latter half of compression process so that improves combustion and enables stable combustion.

OPERATION OF INTAKE MANIFOLD RUNNER CONTROL VALVE 

When the engine is idling or running at slow speed the vales are closed and swirl flow is generated. By closing valves the flowing speed of gas is increased and it stabilizes combustion also improves fuel efficiency.

Valve position	operating condition
Courtesy of NISSAN NORTH AMERICA, INC. Valve closed	Idling, low.small load range
Valve opened Courtesy of NISSAN NORTH AMERICA, INC.	Other than above