Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
  • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
  • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/38—Control of exclusively fluid gearing
  • F16H61/40—Control of exclusively fluid gearing hydrostatic
  • F16H61/46—Automatic regulation in accordance with output requirements
  • F16H61/47—Automatic regulation in accordance with output requirements for achieving a target output speed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
  • B60Y2200/00—Type of vehicle
  • B60Y2200/10—Road Vehicles
  • B60Y2200/14—Trucks; Load vehicles, Busses
  • B60Y2200/147—Trailers, e.g. full trailers or caravans
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
  • F16H59/68—Inputs being a function of gearing status
  • F16H2059/6838—Sensing gearing status of hydrostatic transmissions
  • F16H2059/6861—Sensing gearing status of hydrostatic transmissions the pressures, e.g. high, low or differential pressures

Definitions

• the present invention refers to a system for controlling the operation of an hydraulic motor, in particular for trucks for transporting motor vehicles and trailers.
• hydraulic systems of trucks for transporting motor vehicles and trailers are traditionally composed (apart from those solely equipped with an electro-hydraulic assembly fed by vehicle batteries) of a pump, of the gear or piston type, with fixed displacement and actuated by the truck engine itself, through the gearbox and a suitable power takeoff: in this case, obviously, the pump flow-rate is variable and proportionally depends on the rotation rpm of the truck engine. It is also true that the pump displacement is a compromise chosen in order to balance different and opposed needs: on one hand, guaranteeing a sufficiently high flow-rate to provide the operator with an adequate hydraulic actuator speed, on the other hand not exceeding certain flow-rate values that would generate such load losses as to overheat the plant and the hydraulic fluid over acceptable limits.
• actuators are used with different types and sizes, like usually hydraulic cylinders and orbital motors.
• the speed needs of the different actuators can agree with difficulty with a fixed flow-rate, since if the speed is acceptable for cylinders, it is insufficient for orbital motors; vice versa, if it is acceptable for orbital motors, it is surely too high for cylinders, especially those with a reduced bore.
• the engine rpm at which one operates is normally around its minimum, namely 550 - 650 revolutions/min: such rpm can be increased through a manual accelerator or through the engine control unit. It goes without saying that, by increasing the engine rpm, there is a proportional increase in the pump flow-rate, but it is possible to exploit this principle to obtain a flow-rate increase only when orbital motors are used, and not instead when other hydraulic actuators are used.
• WO-A-2008/081856 and US-A-2009/238696 disclose a control system according to the preamble of Claim 1. Therefore, object of the present invention is solving the above prior art problems, by providing a system for controlling the operation of an hydraulic motor, in particular for trucks for transporting motor vehicles and trailers, that provides an easily variable flow-rate without the help of costly pumps with variable displacement.
• Another object of the present invention is providing a system for controlling the operation of an hydraulic motor, in particular for trucks for transporting motor vehicles and trailers, that automatically stops the engine of such truck in caso of engine inactivity.
• FIG. 1 shows a block diagram of a preferred embodiment of the control system for the operation of an hydraulic motor according to the present invention.
• control system 1 in particular for trucks for transporting motor vehicles and trailers, comprises at least one hydraulic motor 3, preferably of an orbital type, and at least detection means 5 of a rotation speed of such motor 3, such detection means 5 cooperating with control and management means 7, preferably made as at least one electronic unit, to detect the rotation speed of the motor 3, such control and management means 7 operatively cooperating with the control unit 15 of the engine of such truck, and such motor 3 being actuated by the operation of at least one hydraulic distributor 17.
• the detection means 5 are composed of at least one phonic wheel 9, operatively connected to the motor 3 and rotated by this latter one during its operation, and of a respective proximity sensor 11 communicating with such control and management means 7.
• the control and management means 7 then suitably process the signal received from the detection means 5, and in particular from the proximity sensor 11, and send a command for increasing the rotation rpm to the control unit 15 of the truck engine.
• the control and management means 7 wait for a certain time range (delay time) before sending to the control unit 15 the command for increasing the rotation rpm of the truck engine, in order to allow the operator to perform possible approaching and finely regulating manoeuvres with the orbital motor 3.
• delay time a time range
• the motor 3 stops since it is not fed any more through the ducts 19, 20 from the hydraulic feeding circuit 18 of the distributor 17: consequently, the detection means 5, in particular through the proximity sensor 11 and the respective phonic wheel 9, do not detect any more movements of the motor 3 and the control and management means 7 send to the control unit 15 a command to take back the rotation rpm of the tuck engine .to its minimum provided value.
• the delay time length and the amount of increase of the rotation rpm of the truck engine are parameters tha can be set when installing the truck.
• control system 1 can comprise at least one pressure sensor 21 connected to the hydraulic feeding circuit 18 and cooperating with the control and management means 7, adapted to send at least one signal to the control and management means 7 if the hydraulic fluid pressure inside the hydraulic feeding circuit 18 exceeds a preset value: such preset ⁇ pressure value can be chosen so that it is slightly greater than the value that is found in the hydraulic feeding circuit 18 with no load, when there are no actuations of the distributor 17 and the hydraulic fluid circulates in the closed loop, only determining the load losses of the circuit 18 itself.
• control and management means 7 when they do not detect that the preset pressure value is exceeded for a certain time range, can send to the control unit 15 a command for turning the truck engine off: restarting of such engine can occur through a remote command on the trailer or through a remote control, as taught by the art.
• Even the length of the above time range is a parameter that can be set when installing the truck.
• the system 1 for controlling the operation of the hydraulic motor 3, in particular for trucks for transporting motor vehicles and trailers, has its relevance in reducing the fuel costs and in defending the environment, since it optimises the increases of rpm of a truck engine.

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• 2010
  • 2010-04-27 WO PCT/IT2010/000185 patent/WO2010137048A1/en active Application Filing
  • 2010-04-27 EP EP10727973A patent/EP2435711A1/de not_active Withdrawn

Non-Patent Citations (1)

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