| 摘要 |
A method and a device for control of a regenerative hydrostatic drive system, particularly for vehicles, comprises a primary engine (9) with a power transmission (5) to a drive axle (6) and a hydrostatic machine (2), which is selectively connectable to the same drive axle (6) and connected to a hydraulic fluid circuit, which comprises at least one high pressure supply (3) and one low pressure supply (4) of said hydraulic fluid, the hydrostatic machine (2) during braking of a vehicle being connected with said drive axle (6) and operating as pump provides a charging of the high pressure supply (3), while the last-mentioned during acceleration of the vehicle drives the hydrostatic machine (2) as a motor and hence also the drive axle (6). For allowing the use of smallest possible hydraulic fluid volume simultaneously with maximum utilization of said volume the invention suggests that during the flow of the hydraulic fluid in the direction from the high pressure (3) to the low pressure (4) supply is detected the achievement of a predetermined fluid volume in one of the supplies (3, 4) for determination of the quantity of hydraulic fluid remaining in the high pressure supply (3). In case the detection of the predetermined fluid volume is made in the low pressure supply a correction coefficient for the temperature of the hydraulic fluid is incorporated in said quantity determination which in this case is made while taking the given total hydraulic fluid volume into consideration. Thereafter, the change of the remaining volume of hydraulic fluid in the high pressure supply (3) is continuously determined on the basis of the instantaneous speed and displacement of the hydrostatic machine (2) at the same time as the smallest volume of hydraulic fluid is determined, which at instantaneous speed and displacement of the hydrostatic machine (2) is required for allowing a jerk-free shifting to driving only by means of the primary drive engine (9), the results of said two determinations being continuously compared and when found equal brought to initiate said shifting. |
