Wheel Loader

A complex application in the area of machine system behavior is a wheel loader.

Many large loaders do not use conventional automotive steering mechanism. Instead the steering is hydraulically actuated by a pivot point located exactly in between the front and rear axles, also known as “articulated steering”.

This concept allows greater weight capabilities due to solid front axle. 

The application below is built using components and models from Hydraulics Library and Vehicle Dynamics Library in Dymola.

 

Hydraulic articulated steering circuit

 

 

 

The input signal controls the servo valve, feeding steering cylinders with oil. The steering starts in a few seconds after the bumpy road.


Hydraulic pressure and flow rate to the steering cylinders. Initially, the steering cylinders catches up force from the bumpy road. The pressure rises when the cylinders requires oil to steer the wheel loader.