WO2013021288A2 - Système de transmission hydraulique - Google Patents

Système de transmission hydraulique Download PDF

Info

Publication number
WO2013021288A2
WO2013021288A2 PCT/IB2012/002502 IB2012002502W WO2013021288A2 WO 2013021288 A2 WO2013021288 A2 WO 2013021288A2 IB 2012002502 W IB2012002502 W IB 2012002502W WO 2013021288 A2 WO2013021288 A2 WO 2013021288A2
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic flow
flow generator
actuator means
pump
hydraulic
Prior art date
Application number
PCT/IB2012/002502
Other languages
English (en)
Other versions
WO2013021288A3 (fr
Inventor
Alexandre Pizzolatto Gonçalves FERREIRA
Original Assignee
Cummins Brasil Ltda
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cummins Brasil Ltda filed Critical Cummins Brasil Ltda
Publication of WO2013021288A2 publication Critical patent/WO2013021288A2/fr
Publication of WO2013021288A3 publication Critical patent/WO2013021288A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • 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
    • F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
    • F16H61/448—Control circuits for tandem pumps or motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention relates to hydraulic transmission systems for vehicles.
  • the present invention relates to a hydraulic circuit that can drive the wheels of a vehicle so it has torque and rotation compatible with a particular application, and still able to accumulate the energy from braking using it later when the need arises to accelerate the vehicle.
  • Hydraulic systems can match the power transmission in relation to transfer torque and rotation due to the characteristics of incompressibility of the hydraulic oil. These systems are widely used in special equipment to generate torque and rotate the wheels or other traction element (such as a vehicle track, for example). In general, these systems are used in industrial machinery, construction machinery, agricultural equipment and military vehicles.
  • Hydraulic circuits can be "open loop” or “closed loop” type.
  • the "open loop” systems are those in which the hydraulic flow generator, such as a hydraulic pump, generates a flow of oil that is confined in a circuit, which is directed by control valves to the actuators, though the resistance to the operation of actuators will result in pressure increase of the system to working levels calculated for each project.
  • These systems are not reversible and have specific pressure lines and oil return lines.
  • FIG. 1 An example "closed loop circuit” is illustrated in Figure 1. It has a hydraulic flow generator, such as a hydraulic pump, which is a variable and reversible pump, and this device has the control of the circuit, managing the flow and the flow direction according the operator procedure. So it is not necessary to change the direction of rotation of the engine 100 that drives the pump 110.
  • the principle of the "closed loop” is that the outlet of the pump is connected to the inlet of the motor and inlet of the pump is connected to the outlet of the motor. The main pump captures only the return of the actuator itself.
  • the pump 110 Since the pump 110 is connected directly to the actuator 160, which typically is a fixed displacement reversible hydraulic motor, the motor direction of rotation is switched when the oil flow is reversed by the pump 110. Therefore, the pump 110 is driven unidirectionally, which means only one direction of rotation of the driver. However, reversal of the pump 110 direction reverses the direction of the oil flow and causes the actuator 160 to reverse its direction of rotation.
  • the pump 110 may be of a type of that varies the amount of oil displaced per revolution of the pump 110, which makes it possible for a single rotation of the pump 110 to provide a different number of rotations of the actuator 160.
  • the pump 110 has an internal booster pump 120 which receives hydraulic oil from a tank 130 and feeds continuously both lines of the loop, through a set of one-way flow control valves 140.
  • one of the lines connected to the pump 110 acts as a pressurized line the other acts as a return line.
  • the auxiliary pump 120 is feeding the line that is functioning as part of return, keeping the circuit full of oil.
  • the dashed rectangle represents the pump 110 and all its components (including the auxiliary pump 120 and control valves 140).
  • the oil supply by an auxiliary pump 120 is necessary because both the main pump and the actuator allow leakages of the oil hydraulic circuit for internal controls and pressure lubrication.
  • the oil used for this purpose returns to the tank 130 through a drain line 150, shown in Figure 1 by a dashed line that connects the actuator 160 to pump 110 and pump 110 to tank 130.
  • the closed system is also called a "Circuit of Constant Torque," because as the torque of the system depends on the system pressure and the unit displacement of the actuator, then the same pressure will always have the same torque on the actuator, regardless of actuator rotation rate, which varies according to the flow delivered by the hydraulic pump.
  • This document discloses a hydraulic pump coupled to the mechanical system of the vehicle through a gear that, when activated during braking, pumping fluid towards the batteries.
  • This system does not allow an efficient recovery of energy as it is connected to a mechanical shaft coupled to the drive wheels of the vehicle. This means that, besides the loss of efficiency inherent in the mechanical system of transmission, the system is applied in only one axis of the vehicle, only regenerating the braking energy from this axis. Consequently, it generated a low stored energy braking for future regeneration.
  • the system of the present invention comprises: (i) a main circuit that includes a first hydraulic flow generator variable and reversible that feeds a closed circuit with at least a second middle actuator / generator hydraulic flow, while the latter is connected to at least one wheel of a vehicle, and a third means actuator / generator variable and reversible hydraulic flow in parallel with the first flow generator, and a regeneration circuit comprising a fourth means actuator / hydraulic flow generator that will work in the
  • the system of the present invention promotes, because it is hydraulic, excellent transmission efficiency and a huge mechanical simplification.
  • This transmission system also provides an efficient recovery of braking energy
  • Figure 1 illustrates a previously known closed hydraulic circuit.
  • Figure 2 illustrates the system of the present invention according to a preferred embodiment.
  • the transmission system includes two circuits in parallel.
  • the main circuit which is a closed configuration, includes a main pump 1 and a variable displacement reversible flow, four-engines 4, in parallel, coupled to the wheels for traction and braking, and another third pump 3, also in parallel.
  • the first pump 1 is powered by an internal combustion engine 2, for example.
  • the second circuit, the regeneration circuit includes a pump 5 hydraulically coupled to pump 3 which functions as the parallel port between the two circuits.
  • the coupling is mechanical.
  • This second circuit, or regeneration circuit works as an energy accumulator when the pump 5 receives torque and rotation from the pump 3. Therefore, this circuit further comprises at least one hydraulic accumulator 8 for storing hydraulic fluid.
  • the opening and closing line of the regeneration circuit can be made by a means of control, which may consist in the pump 5, a directional valve, and/or a proportional valve. In the preferred embodiment illustrated in Figure 2, are provided for four directional control valves 9, 10, 11, 14, and two proportional valves 12, 13.
  • the valve assembly has the functions to allow free flow when the vehicle is accelerating or moving uniformly, to converge to the flow accumulation of potential energy when braking, and to converge in the stream for reuse when regenerating.
  • the regeneration circuit may further include at least one safety or relief valve 15 which opens in case of sudden increase of pressure in the regeneration circuit.
  • the system of the present invention may include a drain line, illustrated in Figure 2 by a dashed line connecting the four engines 4 with pumps 1, 3 and a reservoir 7.
  • the drain line optionally passes through a hydraulic oil cooling device which consists of a heat exchanger 6 in the example of Fig. 2, positioned immediately before returning to the reservoir 7.
  • the control system of the present invention can be done by an electronic module (not shown) that controls the system according to which receives two signals from the user, namely the accelerator pedal signal and brake pedal signal.
  • these two signals are generated by potentiometers and sent to the electronic module to control the motor 2, the opening and closing of valves, and the direction and intensity of flow in hydraulic pumps and motors.
  • the signal received from the brake pedal is still sent to the conventional braking system of the vehicle.
  • the motor 2 is set for an acceleration rate and maximum torque of rotation, and the impetus for a pump flow is controlled so that, according to the second engine torque and displacement chosen, promotes a hydraulic flow that goes through the system to four hydraulic motors 4 to the wheels.
  • the pump flow is adjusted with a pressure regulation system.
  • the pump 3 which acts as a parallel port between the main circuit and the regenerative circuit, is in neutral position (closed), and does not receive oil from the circuit, any pump, or any motor 4.
  • the driver positions the throttle pedal to maintain a cruising speed, reducing the pressure of the system according to the required speed.
  • the driver tends to take off the foot from the accelerator and, thus, the main pump is placed in a neutral position and the pump 3 is opened to allow the free flow of oil, which now becomes driven by the four motors of the wheels.
  • the pump 3 For the system to rotate freely, and once the pump 3 is coupled to pump 5 which moves the regeneration circuit, there are two directional valves 9 and 10, normally open, allowing all the oil flow generated by pump 5 to pass freely to a reservoir 7 and then return to the pump 5, so that the flow does not pass the line accumulators 8.
  • the second pump 3 now acting as a motor, drives the pump 5 which is to provide hydraulic fluid into the regeneration circuit.
  • the directional valves 9 and 10 are then closed in the line of free movement in order to force the flow generated by the hydraulic pump 5 for the oil accumulator.
  • a proportional valve 12 between the pump 5 and the accumulator 8 is positioned for regulating the pressure at the pump outlet 5 regardless of the level of pressure in the accumulator 8, thus promoting a braking intensity compatible with the demand of the driver.
  • the actions of the driver on the brake pedal is directly proportional to the pressure in the line 5 between the pump 5 and proportional valve 12.
  • the driver stops pressing the brake pedal and, consequently, the system stops storing oil in the accumulator 8, reopening the directional valve 9 and 10 in line and closing movement of the directional valve 11 in line 8 accumulators.
  • the system is now loaded with a certain pressure in the line of the accumulator 8 and the pump 5 is again in free flow.
  • the system goes into a regenerator action.
  • the directional valve 14 is opened so as to direct the flow of hydraulic accumulators 8 for the regeneration circuit, passing through another proportional valve 13, which has the function of controlling the flow of oil in order to better harness the potential energy accumulated.
  • This flow of oil goes to the pump 5, which starts to act as a hydraulic motor driving the pump 3 and hydraulic generating flow in the closed circuit to the wheel motors 4.
  • pump 1 is to provide hydraulic flow to the engine 4.
  • This transmission system provides, besides the inherent advantages of a hydraulic transmission system, such as independent control of traction on each wheel, high performance, elimination of the need for drive axle, gearbox and system differential, and an increase in fuel economy because of accumulating and regenerating energy from braking.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Control Of Fluid Gearings (AREA)
  • Motor Power Transmission Devices (AREA)

Abstract

La présente invention concerne un système de transmission hydraulique pour un véhicule, qui comprend un circuit fermé principal comportant un premier moyen générateur/actionneur de flux hydraulique (1), un deuxième moyen générateur/actionneur de flux hydraulique (4) et un troisième moyen générateur/actionneur de flux hydraulique (3). Le système comprend en outre un circuit de régénérateur comportant un quatrième moyen générateur/actionneur de flux hydraulique (5) couplé au troisième moyen générateur/actionneur de flux hydraulique (3) du circuit principal, et au moins un accumulateur (8).
PCT/IB2012/002502 2011-06-08 2012-06-08 Système de transmission hydraulique WO2013021288A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI1102937-4 2011-06-08
BRPI1102937-4A BRPI1102937A2 (pt) 2011-06-08 2011-06-08 sistema de transmissço hidrÁulico

Publications (2)

Publication Number Publication Date
WO2013021288A2 true WO2013021288A2 (fr) 2013-02-14
WO2013021288A3 WO2013021288A3 (fr) 2013-07-18

Family

ID=47669026

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/002502 WO2013021288A2 (fr) 2011-06-08 2012-06-08 Système de transmission hydraulique

Country Status (2)

Country Link
BR (1) BRPI1102937A2 (fr)
WO (1) WO2013021288A2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022748A1 (fr) * 2006-05-30 2009-02-11 Mitsubishi Heavy Industries, Ltd. Véhicule de travail
US7841432B2 (en) * 2004-11-22 2010-11-30 Bosch Rexroth Corporation Hydro-electric hybrid drive system for motor vehicle
US7856817B2 (en) * 2004-12-01 2010-12-28 Haldex Hydraulics Corporation Hydraulic drive system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7841432B2 (en) * 2004-11-22 2010-11-30 Bosch Rexroth Corporation Hydro-electric hybrid drive system for motor vehicle
US7856817B2 (en) * 2004-12-01 2010-12-28 Haldex Hydraulics Corporation Hydraulic drive system
EP2022748A1 (fr) * 2006-05-30 2009-02-11 Mitsubishi Heavy Industries, Ltd. Véhicule de travail

Also Published As

Publication number Publication date
WO2013021288A3 (fr) 2013-07-18
BRPI1102937A2 (pt) 2013-07-16

Similar Documents

Publication Publication Date Title
US8327637B2 (en) Hydraulic energy recovery system with dual-powered auxiliary hydraulics
KR100812478B1 (ko) 자동차 파워트레인
US8490739B2 (en) Gear box for hydraulic energy recovery
US7856816B2 (en) Hydraulic brake energy regeneration system for electric energy storage and vehicle drive assist
US8272463B2 (en) Electro-hydraulic machine for hybrid drive system
US9174521B2 (en) Drive train of a mobile machine
JP6226390B2 (ja) 油圧式回生装置
WO2012175943A1 (fr) Système hydraulique permettant de fournir un entraînement auxiliaire à un groupe motopropulseur et un circuit hydraulique
US9327588B2 (en) Controlling a drive system having a planetary gear set
US20150204423A1 (en) Drive system having a planetary gear set
WO2013021288A2 (fr) Système de transmission hydraulique
KR20170006109A (ko) 폐열회수시스템의 회수동력 전달장치
CN104246236B (zh) 车辆用液压回路及搭载该车辆用液压回路的车辆
JP7382843B2 (ja) 発進時エンジン出力低減装置
US9915299B1 (en) Hydrostatic clutch system and method for making power under acceleration
CN105667291B (zh) 静液压式驱动系统
JPH11182675A (ja) 駆動力伝達装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12822612

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 12822612

Country of ref document: EP

Kind code of ref document: A2