Electronic Control Systems for Mobile Hydrostatics

This paper discusses the application of electronics to off-highway vehicle transmission controls. While special problems have to be dealt with in vehicle applications, the growing use of on-board electronics has opened the door to greater utilization of the inherent flexibility of the hydrostatic transmission.

Two production electronic control systems are presented as examples. The first is a simple open-loop remote transmission ratio control system. The second is a closed-loop output speed control system with manual and automatic shutdown logic and displays to keep the driver informed of operating conditions.