| Electronic throttle system operation |
| In the electronic throttle, the throttle valve is not activated
by a cable. There is no mechanical connection between the throttle
and the throttle valve. |
| The position of the accelerator is transmitted to the Engine control unit -J623- by two accelerator
position sensors (variable resistance; stored in a housing), which
are connected to the accelerator. |
| The position of the accelerator (at the driver's criterion)
is the main input value for the Engine control unit -J623-. |
| The throttle valve is activated by an electric engine (butterfly
element) incorporated to the Throttle valve module -J338-, in all load and rotation intervals. |
| The throttle valve is activated by a butterfly element, according
to data provided by the Engine control unit -J623-. |
| With the engine turned off and the ignition connected, the Engine control unit -J623- activates the butterfly
element, due to the data provided by the Accelerator pedal
position sensor -G79-. This means that if the accelerator
is half activated, the butterfly element will open proportionally,
that is, the throttle valve will be half opened. |
| With the engine running (loaded), the Engine control
unit -J623- may open or close the butterfly, regardless
of the Accelerator pedal position sensor -G79-. |
| Accordingly, the throttle valve may, for instance, be completely
open already, even if the accelerator is only half activated. The
benefit is being able to avoid losses from choking, caused by the
throttle valve. |
| Furthermore, this enables lower fuel consumption and emissions
of pollutants for certain load conditions. |
| The necessary torque may be obtained by the Engine
control unit -J623-, through an optimal combination
between the throttle valve opening and the over-supply pressure. |
| Believing that the „electronic throttle“ comprises
only one or two components would be a mistake. The electronic throttle
is a system comprised of all the components that contribute to determining
the position of the throttle valve, in order to adjust it and activate
it, such as for example, the Accelerator pedal position sensor -G79-, the Throttle valve command unit -J338-, the "E-gas" system fault warning light -K132-, the Engine control unit -J623-, etc). |
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