Abstract:
A compact hydraulic unit (12) for providing a vehicle with drive power, comprising a housing (16) in which a hydraulic motor (11) is housed comprising a distribution plate (13), a plate (17) supporting floating cylinders (9), a plate (3) axially holding the floating cylinders on the support plate, arranged to either side of a common fixed plate (10) and fixed pistons (6, 7) arranged between the plate and the floating cylinders and cooperating with them; said hydraulic motor converting the energy coming from a pressurised fluid into mechanical energy in the form of torque driving a differential, contained in the same housing, and wherein the output shafts (18) are coupled to the drive wheels of the vehicle; said differential comprising a casing containing planet pinions (1) engaging with planetary gears (2) integral with the output shafts of the differential, coupled to the drive wheels of the vehicle and configured to distribute the torque to the output shafts, wherein the differential is mounted in rotation inside the hydraulic motor, and the axis of rotation (XX') of the hydraulic motor coincides with the axis of rotation of the differential.
Abstract:
The invention concerns a method and a device for controlling/commanding a hydraulic module installed in a hybrid vehicle, the module comprising at least one hydraulic engine driving a differential incorporated in the module, the engine having a fixed piston and a floating cylinder and being connected to a hydraulic circuit selectively at low pressure or at high pressure, the engine converting the energy coming from the pressurised fluid into mechanical energy in the form of a drive torque of the differential transmitting it to the drive wheels of the vehicle, said method carrying out, on request of a torque value (21) from the module transmitted by the control/command of the power train (52), a regulation of the engine torque, characterised in that the torque regulation is carried out according to the high and low pressure values of the hydraulic circuit and according to the angular position of the module, said regulation being carried out by controlling the pressure in the circuit.
Abstract:
The invention relates to a hybrid vehicle drive train comprising a heat engine (2) connected to a power distribution system (4) that distributes power over two paths, one path driving the driving wheels (22) of the vehicle via a mechanical transmission (14) and one path driving a hydraulic pump (10) that refills pressure accumulators (30, 32). The drive train (1) also comprises a hydraulic motor (24) which draws the fluid from the pressure accumulators in order to drive the driving wheels (22). The drive train is characterized in that it also includes an electric pump (34) which is connected to batteries (36), as well as to the pressure accumulators (30, 32) in order to refill said accumulators using power supplied by the batteries.