System Description

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INPUT/OUTPUT SIGNAL CHART

Sensor	Input signal to ECM	ECM function	Actuator
Camshaft position sensor Crankshaft position sensor	Engine speed and piston position	VVEL control	VVEL control module ↓ VVEL actuator motor assembly
Accelerator pedal position sensor	Accelerator pedal position
VVEL control shaft position sensor ↓ VVEL control module	Control shaft actual angle

SYSTEM DESCRIPTION

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1.	VVEL control shaft position sensor	2.	Drive shaft	3.	Link A
4.	Eccentric cam	5.	Output cam	6.	Valve lifter
7.	Intake valve	8.	Intake camshaft sprocket	9.	Control shaft
10.	Ball screw shaft	11.	Ball screw nut	12.	VVEL actuator motor assembly
13.	Rocker arm	14.	Link B

VVEL (Variable Valve Event and Lift) is a system that controls valve event and valve lift continuously.

ECM decides the target valve lift according to the driving condition and sends the command signal to the VVEL control module via ENG communication line.

VALVE LIFT OPERATION

Rotational movement of the drive shaft equipped with eccentric cam is transmitted to output cam via the rocker arm and two kinds of links to depress the intake valve.

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1.	Link B
2.	Output cam
3.	Eccentric cam
4.	Drive shaft
5.	Link A
6.	Rocker arm

VARIABLE OPERATION

VVEL control module controls the rotation of the control shaft using the VVEL actuator motor assembly and changes the movement of the output cam by shifting the link supporting point. As a result, valve lift changes continuously to improve engine output and response.

Courtesy of NISSAN NORTH AMERICA, INC.

1.	Link B
2.	Output cam
3.	Control shaft
4.	Rocker arm