초록 ▼

A drive unit for a vehicle comprises an engine for driving a gear-shift transmission through an input shaft. The input shaft is also coupled via a gear assembly and a hydrodynamic coupling to a flywheel accumulator. During acceleration of the vehicle, kinetic energy stored in the flywheel flows to t

A drive unit for a vehicle comprises an engine for driving a gear-shift transmission through an input shaft. The input shaft is also coupled via a gear assembly and a hydrodynamic coupling to a flywheel accumulator. During acceleration of the vehicle, kinetic energy stored in the flywheel flows to the input shaft of the transmission. When braking takes place, energy from the input shaft flows to the flywheel accumulator. The torque transmitted by the hydrodynamic coupling is adjustable. As the coupling slippage approaches a boundary of a slippage region in the coupling, a control device effects a switching of the gear-shift transmission whereby readjustment of the coupling slippage is achieved. Furthermore, the control device controls the gear-shift transmission－on the basis of whether “acceleration”or “braking”is demanded－such that the speed of rotation of a first coupling half in the coupling, as viewed from the direction of energy flow, is greater than the speed of rotation of another coupling half.

대표청구항 ▼

A drive unit for a vehicle, comprising: an input shaft intended to be driven by an engine, an output shaft and a transmission disposed between the input shaft and the output shaft and effective for setting a transmission ratio therebetween, the input shaft coupling the engine and the transmission to

A drive unit for a vehicle, comprising: an input shaft intended to be driven by an engine, an output shaft and a transmission disposed between the input shaft and the output shaft and effective for setting a transmission ratio therebetween, the input shaft coupling the engine and the transmission to one another and the output shaft being effective for applying rotational energy from the transmission to the vehicle; a flywheel accumulator; a slippable coupling for coupling the input shaft and the flywheel accumulator to one another, the slippable coupling comprising a first coupling half and a second coupling half and having a speed ratio which is infinitely adjustable within a speed ratio range extending between a lower and an upper limit; the drive unit being of the type which permits rotational energy to flow from the flywheel accumulator to the output shaft when the vehicle is in an acceleration mode and from the output shaft to the flywheel accumulator when the vehicle is in a braking mode; and a control device for controlling the transmission such that whenever the slippable coupling approaches one of its speed ratio limits, the transmission ratio is adjusted such that the speed ratio of the coupling remains within its speed ratio range; the control device further comprising means for controlling the transmission such that the speed of rotation of that coupling half of the first and second coupling halves which is situated first in the direction of energy flow rotates at a greater speed than the other of the two coupling halves which is located downstream along the energy flow direction.