Motor vehicle with an internal combustion engine which can be charged by means of an exhaust gas turbocharger and a hydrostatic-mechanical drive for the auxiliary units

摘要

The invention relates to a vehicle with a drive arrangement (1) consisting of an internal combustion engine which can be turbocharged by means of an exhaust turbocharger (2) and of a transmission and with hydrostatically-mechanically driven auxiliary units (NA) which can be driven mechanically, individually or in groups, by a hydrostatic motor (3) fed by a pump (9) with a variable delivery pressure and/or volume which can be driven by the drive arrangement (1). The hydrostatic motor (3) can be formed by a fixed displacement motor which can be partially bypassed for the purpose of control or by a motor which can itself be adjusted between a minimum and a maximum for control of operation. The hydrostatic part of the hydrostatic-mechanical drive for the auxiliary units (NA) is supplemented by a hydrostatic machine (21) which can be operated as a motor or a pump, which - is connected on the input side to the output (15) of the hydrostatic motor (3) and to an oil reservoir tank (13) and on the output side to the input of the pump (9), furthermore - acts via a speed-increasing planetary gear mechanism (27) and, if required, a clutch (28) on the shaft of the exhaust turbocharger (2) and - during drive-away and acceleration of the vehicle - when it is operated as a motor - accelerates the exhaust turbocharger (2) and, when there is an excess of exhaust energy - when it is operated as a pump and relieves the load on the pump (9), then operated as a motor, supplying the hydrostatic motor (3) - converts the driving energy fed in by the exhaust turbocharger (2) into supplementary energy for driving the auxiliary units (NA) and/or the internal combustion engine. This system thus provides a motor vehicle in which the auxiliary units can be operated in an optimum manner and in which, furthermore, the turbo lag during drive-away and acceleration can be avoided and in which, finally, it is also possible to convert an excess of exhaust energy into useful work. IMAGE