Electrical specifications

This system allows a proportion of exhaust gases (5 - 15%) to be sent to the exhaust under certain engine service conditions.

This strategy dilutes the fuel mixture: the temperature peak in the combustion chamber is lowered to keep nitrogen oxide (NOx) production down.

The EGR (Exhaust Gas Recirculation) valve adopted on this system is electronic and fitted on the outlet duct of cylinder no. 3 (on head).

Cuts in with coolant temperature >55°C, inlet air temperature >17°C and rpm between 1550-5600.

The Linear EGR valve is a control device operated by a solenoid that ensures a continually variable flow by moving a conical pin inside a hole.

The solenoid is not affected by the vacuum and can therefore open with any engine load or manifold vacuum. The ECU maintains a flow sufficient for engine requirements by measuring engine parameters such as speed, load and temperature according to input from sensors. The required EGR flow and pin position are then calculated on the basis of the setting program required for each specific application. The ECU now sends the Linear EGR a command in the form of a modulated pulse and amplitude current signal.

To ensure precision, a pin position sensor forming part of the valve sends the ECU a non-return signal. The ECU continually compares this signal with another signal relating to required pin position. Any necessary adjustments are made automatically in order to ensure flow precision.

The valve consists of:

1. Sensor cover
2. EGR sensor assembly
3. Primary pole element
4. Winding assembly with encapsulated coil
5. Armature sleeve
6. Armature assembly and base
7. Tapered pin
8. Checking exhaust gas outlet
9. Checking exhaust gas intake

Electrical specifications