ABSTRACT
This paper puts forward hydraulic auto-leveling control system for vehicle-borne
platform with four legs based on Programmable Logic Controller. In particular, a
Siemens S7-300 (Programmable Logic Controller) PLC, and the accessional
hydraulic circuit and control circuit is used. By introducing the theory of auto-leveling,
the methods to design the hardware and software of the embedded control system
are presented. The system adopts highly accurate two-axis tilt sensor and
proportional direction control valves, optimizing auto-leveling strategy. The hardware
and software of the embedded system make use of the concept of minimizing the
error as possible on tilting axis corresponding to the required accuracy. The tests
prove that this auto-leveling control system improves leveling-precision, performance
stability of the system, shortens the leveling-time, and satisfies the maneuverability
and operating requirements of the vehicle-borne platform in formidable nature
conditions.