HARDWARE-IN-THE-LOOP SIMULATION OF A HYDROSTATIC TRANSMISSION WITH SEQUENCE-CONTROLLED MOTORS

抄録

To increase performance in a hydrostatic transmission using sequence-controlled motors one of the motors is disconnected from the other transmission at high vehicle velocities and connected again when torque demand increases. If the reconnection procedure is handled using secondary control this must be taken under extra care. A method to investigate the reconnection procedure in the early state is to use hardware-in-the-loop (HWIL) simulation. The reconnecting motor is then acting as the hardware while the rest of the system, the main transmission, is real-time-simulated. As interface between hardware and simulation a high-response servovalve is used. This acts both as a controller for the pressure upstream of the hardware, and as a flow measure orifice to serve the simulation model with input data. This paper deals with the test method and results from the HWIL simulation described above. The results are partly used for verifications of earlier simulations.