Microprocessor Based Electrohydraulic Control For Car Haulers
Car hauler ramps have historically been hydraulically positioned via banks of manual control valves that provide limited operator visibility and flexibility. On some enclosed type haulers, manual valves are not feasible. An electro-hydraulic system has been developed utilizing on/off solenoid valve stacks. A handheld control unit with a membrane switch pad communicates with a valve interface module near each valve stack. The handheld unit and the interface modules each have microprocessor circuitry to provide intelligent distributed control. Self monitoring circuitry provides safety features and system diagnostics. Wiring harness assemblies connect the valve stacks to the interface modules. A retractile cable from the handheld unit to the trailer allows improved operator mobility and visibility. An infrared wireless interface between the trailer and handheld unit will also be available.