Renault Clio: Camshaft dephaser: Function

I - SPECIAL NOTES

Its role is to modify the valve timing.

To improve cylinder filling at all engine speeds, the engine is fitted with an inlet camshaft dephaser (1).

Renault Clio. Camshaft dephaser: Function

Dephasing at the moment when the inlet valves close optimises filling according to engine speed. Torque at midrange engine speed and output at high engine speed are improved.

Leaving the inlet valves open for longer at high engine speed allows the mixture to be continually admitted thanks to its high speed.

However, at lower engine speeds the gases do not have a high level of inertia. It is therefore preferable to close the inlet valves earlier to avoid incorrect filling and a loss of torque due to the reflux of fresh gases.

The higher the engine speed, the later the inlet valves must be closed.

II - OPERATION AND PROGRAMMING

The oil is supplied to the dephaser by a solenoid valve (2) located on the cylinder head.

The supply by a variable OCR signal (amplitude 12 V, frequency 250 Hz) enables oil to be distributed to the mechanism and the dephaser angle to be adjusted.

Renault Clio. Camshaft dephaser: Function

The operation of the camshaft dephaser varies continuously.

The computer supplies the solenoid valve (2) with a variable opening cyclic ratio proportional to the desired dephasing.

Dephasing is varied continuously from 0 to 43

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