Drive train for a vehicle and method of controlling a drive train
US6272950A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19163
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A drive train comprises an internal combustion engine, a clutchless gearbox, which can be shifted by means of an electronic control unit and by means of actuating devices, without a mechanical synchronizing device, and a hydrostatic gearbox with a hydraulic pump and a hydraulic motor, which are connected in a closed circuit. The rotational speed of the hydraulic motor being controllable in dependence on a control signal to the adjusting device of the hydraulic pump and/or to the adjusting device of the hydraulic motor. The control unit calculates the control signal by means of setpoint input via an accelerator pedal or as a function of the rotational drive speed of the internal combustion engine, with shifting of the transmission stages being possible by means of the actuating devices. The control unit controls the adjusting device of the hydraulic pump as well as the actuating devices for the gearbox for the electronic synchronization of the latter by means of a characteristic curve which represents the speed ratio of the hydraulic motor to the hydraulic pump in dependence on an actuating signal to the adjusting device of the hydraulic pump for a loadfree state of the gearbox. For…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.