HYDRAULIC DRIVE SYSTEM WITH NEUTRAL DRIFT COMPENSATION AND TEMPERATURE COMPENSATION FOR PRESSURE LIMITS

摘要

A hydraulic drive system for a vehicle converts energy between hydraulicenergy andmechanical energy by storing and releasing hydraulic fluid. The systemincludes a highpressure storage device, a low pressure storage device, and a pump-motoroperating at a rangeof pump-motor speeds for converting between hydraulic energy and mechanicalenergy. Thepump-motor is disposed between the high pressure device and the low pressuredevice. Thesystem utilizes various pressure limits for compensating for variousinefficiencies, such asthose related to temperature changes, to maintain the hydraulic drive systemin normaloperation.