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The recirculation of exhaust gas it’s a way to reduce toxins in emissions. The intension of exhaust gas recirculation is reduce the temperature of the combustion induce lower production of Nitric Oxides (NOx). This exhaust gas recirculation will be efficiently only with a exactly control. The recirculation valves could be controlled pneumatic or in an electronic way, it depends of each version.
The recirculation of exhaust gas it’s a way to reduce toxins in emissions. The intension of exhaust gas recirculation is reduce the temperature of the combustion induce lower production of Nitric Oxides (NOx). This exhaust gas recirculation will be efficiently only with a exactly control. The recirculation valves could be controlled pneumatic or in an electronic way, it depends of each version.
These valves come in a very wide range of versions and designations. We provide information on the most common of these valves:
EUV – ON/OFF ELECTRICAL SWITCH VALVE
A 3-way electrovalve with two positions that can work with a vacuum or pressure depending on the use, and in open or closed mode (ON/OFF), or controlled by frequency (entering a vacuum or pressure value proportional to the variable electrical power level at which it is controlled.
The vacuum normally comes from an electrical vacuum pump inside the engine. Vacuum pumps manage to reach negative pressure values of up to -950 mbar.
The spring pressures the mobile core which, by way of a small valve, cuts off the connection with the vacuum pump. The atmosphere intake is connected with the unit and allows the passage of air flow from the atmosphere into the unit.
The magnetic field generated by the coil moves the mobile core against the spring, closing the air intake by way of the small valve. The unit is connected to the vacuum pump.
ON/OFF electrovalves may be found anywhere in the vehicle in which parts of the engine (adjustors/actuators) must be operated pneumatically.
EDW – PROGRESSIVE ELECTROVALVES (TGV)
This is an electrovalve that adjusts the vacuum of air which provides a vacuum level proportional to the variable electrical powering value at which it is controlled.
The electrovalve has two intakes: one with a high vacuum value and another with atmospheric pressure and one outlet, which is the intermediate vacuum that it regulates.
The vacuum normally comes from an electrical vacuum pump inside the engine. This vacuum pump manages to reach negative pressure values of up to -950 mbar.
The TGV’s regulated vacuum outlet is always connected to a pneumatic actuator. In the pneumatic actuator, the vacuum value is turned into a force through the membrane that separates the 2 chambers, the vacuum chamber and the atmospheric chamber. This force counteracting that of a spring allows the actuator’s axis to go into different positions in proportion with the vacuum which regulates our EV.
The abbreviation TGV comes from the French or Spanish words for Turbo with Variable Geometry. It is a type of Turbo compressor in which the operation can be controlled by varying the intake of exhaust gases into the turbine through the motion of a mechanical geometry.
In English, it is usually known by the abbreviation VNT, for “Variable Nozzle Turbo”.
These are used for:
Variants:
Because electrovalves are a unit found in many systems within a vehicle, the symptoms which indicate that a valve has deteriorated or broken may be quite varied:
In the OBD (On Board Diagnostics) test, the electrovalves do not monitor their operation except for flow, short-circuit and mass contact. This is why breakdowns are not recognised reliably and anomalies are often attributed to other components.
Possible Causes:
Therefore, in such an instance a specialist is required with knowledge of the system who does not blindly trust a failure message and simply limits himself to changing a (possibly) mistaken part, but instead examines the failure indicated and searches for its causes.
Verification:
The airtightness of an electrovalve can be verified simply using a manual vacuum pump. A simple electrical check of an electrovalve is feasible in many cases using a typical multimeter.
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