| 摘要 |
PCT No. PCT/EP89/00958 Sec. 371 Date Feb. 13, 1991 Sec. 102(e) Date Feb. 13, 1991 PCT Filed Aug. 12, 1989 PCT Pub. No. WO90/02060 PCT Pub. Date Mar. 8, 1990.Arrangement and method for operating a drive unit for motor vehicles, particularly for agricultural and construction machinery, with a controllable internal combustion engine (2), a continuously variable hydromechanical power split transmission (6) and a control device (3) which in order to start and to operate the vehicle at low speeds and under load, at first reduces the rotational speed of the internal combustion engine to less then the nominal speed, reaches a first speed by reducing the delivery volume of the adjusting pump (13) of the hydrostatic branch (15), a further increased speed by increasing the rotational speed of the internal combustion engine and as a result the further increase in the vehicle speed by controlling the transmission ratio of the hydrostatic-mechanical power split transmission (6) is achieved.
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