Load control on gasoline engines is normally performed by throttling the intake air. This function is enabled by throttle bodies, which simultaneously, can also carry out traditional functions such as idle speed control, travel speed control and anti-slip control.
Even today's modern direct-injection gasoline engines or engines with variable valve timing require throttle and/or control plates either for a more homogeneous mixture formation or for controlling residual gases. All these options for influencing intake airflow and the associated functions are achievable with the aid of electric motor-controlled ETC-E (drive-by-wire) systems.
At the same time, the latter opens up possibilities for reducing fuel consumption and lowering emissions on gasoline engines. Today's diesel engines also require control plates for precisely metering the exhaust gas recirculation.
The D.C. motor with dual-stage gear is the basic concept for all throttle and control plates. Integrated position control, a redundant return system and diameter options from under 40 to 90 mm-these are some of the outstanding functions and features available to customers through this system.
On both gasoline and diesel engines there are very many control functions performed with the aid of path or angle adjustment. These include adjusting the intake manifold flaps on variable- length manifolds or the actuation of air-swirl flaps for air control and cylinder charge fine-tuning.
In the exhaust gas system, flaps are used for emission reduction and acoustic fine-tuning. The work previously performed by vacuum actuators is increasingly being taken over by electric drive modules.
The rotation of the D.C. motor is converted by a gear unit into an angular position. This allows high actuating speeds and forces to be achieved. Depending on requirements, either spur or worm gears are used. A wide variety of modules-ranging from basic to "smart" actuators (EAM-I, through internal feedback permitting position control) ensures that all customer requirements can be met.
Self-calibration and self-diagnosis logs are standard features just as the facility to communicate with BUS systems. Depending on their location within the engine compartment, the housings are made from aluminum or plastic.