Throttle valve

In general terms, the throttle valve must regulate the air or mixture supply for the combustion engine. Depending on the engine concept, this serves different purposes. In the case of petrol engines...

Environmental protection

Optimum operation of the combustion engine and minimum pollutant emissions rely on precision control of the intake air. Throttle valve modules with integrated electronics enable the intake air quantity to be exactly matched to the prevailing operation conditions independently of the driver's performance requirements. As such they make an important contribution to effective fuel combustion and low pollutant emissions.

Function

In general terms, the throttle valve must regulate the air or mixture supply for the combustion engine. Depending on the engine concept, this serves different purposes.

In the case of petrol engines, speed and power output are regulated by means of fresh air or mixture dosing.

Diesel engines generally do not need a throttle valve. However, in modern diesel cars, throttling the amount of intake air facilitates precision control for exhaust gas recirculation and stops the engine from shaking when the ignition is switched off.

The throttle valve is installed in the intake air system of the combustion engine. The opening angle of the valve determines how much fresh air or air/fuel mixture flows into the cylinders (carburettor engines, for example). In older generation engines, the throttle valve is connected directly to the accelerator pedal and operated mechanically via a cable. For newer vehicles there are various principles of operation:

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