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ME-Mobil - Rear Axle Steering System in a Pushback
So far the steering of the rear axle in a pushback tractor was linked to the orbitrol circuit of the front axle. In these systems high steering forces and inner leakage lead to steering deviation of the rear axle. Moreover, changing of the steering modes e.g. from all-wheel into crab steering requires a return-to-zero procedure in order to synchronize the axles.
The electronic-hydraulic steering system applied in the TUG GT110 is using an angle transducer on the front axle. Based on the front axle steering angle, the vehicle geometry and the vehicle speed a set point for the rear axle is calculated in the safety steering computer. A proportional valve provides the steering movement of the rear axle, so the rear axle is mechanically completely decoupled from the front axle and always synchronized according the geometry due to a closed-loop control circuit. The axle payload is not an issue at all and finally only a question of the nominal volume flow of the hydraulic valve.
A change of different steering modes can be done from any steering position of the axles. Moreover, in vehicles with two driver cabins the orbitrol and the electronic-hydraulic steering valve can be assigned to the respective axle in dependency of the drive direction and active driver cabinet, so maloperation is avoided.