Nissan Juke F15. Manual - part 456

 

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Nissan Juke F15. Manual - part 456

 

 

SYSTEM

EC-637

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

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The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the

engine. The ignition timing data is stored in the ECM.

The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-

nal. Computing this information, ignition signals are transmitted to the power transistor.

During the following conditions, the ignition timing is revised by the ECM according to the other data stored in

the ECM.

• At starting

• During warm-up

• At  idle

• At low battery voltage

• During acceleration

The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed

within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not

operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.

The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.

EGR SYSTEM
EGR SYSTEM : System Description

INFOID:0000000012198208

SYSTEM DIAGRAM

JSBIA7178GB

EC-638

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

SYSTEM

SYSTEM DESCRIPTION

EGR VOLUME CONTROL

The EGR volume control regulates the flow rate of exhaust gas flowing from downstream of exhaust manifold

catalyst to intake manifold. The exhaust gas flow rate is controlled by opening/closing the EGR path in the

EGR control valve.

A built-in DC motor moves the valve continuously corresponding to the ECM output signal.

The EGR volume control valve position sensor detects the valve position and sends the voltage signals to the

ECM.

The adoption of water-cooled EGR cooler reduces the knocking by efficiently cooling the gas circulated by the

EGR system to lower the combustion temperature and improves fuel efficiency by raising the thermal effi-

ciency.

The ECM judges the current opening angle of the valve from this signals and the ECM controls the DC motor

to make the valve opening angle properly.

The opening angle of the valve varies for optimum engine control. The optimum value stored in the ECM is

determined by considering various engine conditions.

The EGR volume control valve remains close under the following conditions.

• Engine stopped

• Engine starting

• Low engine coolant temperature

• Excessively high engine coolant temperature

• High engine speed

• Accelerator pedal fully depressed

• Low intake air temperature

INTAKE VALVE TIMING CONTROL
INTAKE VALVE TIMING CONTROL : System Diagram

INFOID:0000000012198209

JSBIA5478GB

JPBIA4760GB

SYSTEM

EC-639

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

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INTAKE VALVE TIMING CONTROL : System Description

INFOID:0000000012198210

INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake-

valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant-

temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control sole-

noid valve depending on driving status. This makes it possible to control the shut/open timing of the intake

valve to increase engine torque in low/mid speed range and output in high-speed range.

INTAKE VALVE TIMING INTERMEDIATE LOCK CONTROL

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed and piston position

Intake valve tim-
ing control

Intake valve timing con-
trol solenoid valve

Camshaft position sensor (PHASE)

Engine oil temperature sensor

Engine oil temperature

Engine coolant temperature sensor

Engine coolant temperature

Combination meter

CAN commu-
nication

Vehicle speed signal

JPBIA5034GB

EC-640

< SYSTEM DESCRIPTION >

[MR EXCEPT FOR NISMO RS MODELS]

SYSTEM

System Diagram

System Description

The intake valve timing intermediate lock control improves the cleaning ability of exhaust gas at cold starting

by fixing the camshaft sprocket (INT) with two lock keys and bringing the cam phase into intermediate phase.

Cam phase is fixed at the intermediate phase by two lock keys in the camshaft sprocket (INT). Lock key 1 con-

trols retard position and lock key 2 controls advance position.

ECM controls the intermediate phase lock by opening/closing the intake valve timing intermediate lock control

solenoid valve to control oil pressure acting on the lock key and locking/unlocking the lock key.

Lock/Unlock Activation

When ECM activates the intake valve timing intermediate lock control solenoid valve, oil pressure generated in

the oil pump is drained through the oil pressure path in the control valve. Since oil pressure is not acted on the

lock key, the lock key position is fixed by the spring tension and the cam phase is fixed at the intermediate

phase.

When ECM deactivates the intake valve timing intermediate lock control solenoid valve, unlocking oil pressure

acts on each lock key. Lock key 1 is not released because it is under load due to sprocket rotational force. For

this reason, lock key 2 is released first by being pushed up by unlocking oil pressure. When lock key 2 is

released, some clearance is formed between lock key 1 and the rotor due to sprocket rotational force and

JPBIA5973GB

JPBIA6317GB

 

 

 

 

 

 

 

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