WO2004029459A1 - Engin de travaux publics du type chargeur-excavateur, et procede de gestion du fonctionnement d'un tel engin. - Google Patents
Engin de travaux publics du type chargeur-excavateur, et procede de gestion du fonctionnement d'un tel engin. Download PDFInfo
- Publication number
- WO2004029459A1 WO2004029459A1 PCT/FR2003/050065 FR0350065W WO2004029459A1 WO 2004029459 A1 WO2004029459 A1 WO 2004029459A1 FR 0350065 W FR0350065 W FR 0350065W WO 2004029459 A1 WO2004029459 A1 WO 2004029459A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- mode
- pump
- power mode
- full power
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
- F04B27/0878—Pistons
- F04B27/0886—Piston shoes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/12—Parameters of driving or driven means
- F04B2201/1204—Position of a rotating inclined plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/12—Parameters of driving or driven means
- F04B2201/1205—Position of a non-rotating inclined plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/10—Inlet temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/11—Outlet temperature
Definitions
- the invention relates to the field of public works machines. More specifically, it targets machines equipped with a hydraulic circuit, and fulfilling the combined functions of loader and excavator. It relates more specifically to particular equipment of hydraulic circuits, intended to protect the latter against increases in temperature of the oil circulating therein.
- monitoring the temperature of the oil in the hydraulic circuit is important to guarantee the reliability of a machine.
- this monitoring is carried out by means of a temperature probe, which is generally located at the level of the oil tank, and which is connected to a device triggering a visual and / or audible alarm inside the driver's cabin.
- a threshold predetermined generally around 97 ° C. If the driver deliberately decides to continue operating the machine, the oil temperature may continue to rise, with the risks of degradation mentioned above.
- a problem which the invention seeks to solve is that of ensuring effective protection of the hydraulic circuit against temperature rises, regardless of the behavior of the driver.
- a loader-excavator comprises an articulated shovel, making it possible to make trenches, or more generally to dig the ground near the station of parking of the machine. The operations of this shovel are generally done while the machine is stopped.
- a loader-excavator has a loader bucket for picking up materials. placed on the ground, to transport and load them, for example in a truck trailer located in a different place. In this case, the engine of the machine must provide the necessary power not only to operate the bucket, but also to move the machine.
- the hydraulic circuit is equipped with a variable flow pump capable of operating in two distinct modes.
- the pump in a so-called “full power” mode, the pump is regulated so that it can use almost all of the power delivered by the heat engine.
- the variable flow pump is regulated according to a so-called “reduced power” mode.
- the invention therefore relates to a public works machine of the loader-excavator type, comprising a hydraulic circuit supplying one or more hydraulic actuators, and for example one or more jacks located on one or more work equipment.
- this hydraulic circuit is equipped with a variable flow pump, which is capable of operating in two distinct modes, namely a so-called “full power” mode dedicated to operation in an excavator, and a so-called “power mode”. reduced “dedicated to charger operation.
- this machine is characterized in that it also includes a temperature sensor, making it possible to determine the temperature of the oil circulating in the hydraulic circuit. It also includes means for automatically switching the operation of the pump from the "full power” mode to the "reduced power” mode, when the oil temperature exceeds a predetermined threshold.
- the invention consists in limiting the power available at the level of the hydraulic circuit, by reducing the maximum power of the variable flow pump, when the temperature exceeds a predetermined threshold, typically of the order of 90 ° C. This tilting is done automatically, without requiring the driver's intervention. Switching to reduced power mode means that the losses due to friction within the hydraulic circuit are reduced, and therefore normally lead to a drop in the oil temperature. Thus, the driver can continue to perform the various operations, benefiting however with a lower execution speed, but preserving the integrity of the hydraulic circuit.
- the invention uses existing pumps, which are designed to operate in two distinct modes depending on the work carried out by the machine, that is to say loader work or excavator work.
- the invention consists in taking advantage of the possibility of changing modes to provide protection against temperature rises.
- the mode change of the pump occurs not only when the driver switches from loader to excavator operation (and vice versa), but also when the temperature rises abnormally.
- the pump can therefore be forced to operate in "reduced power" mode even when the machine is used in an excavator, in case the oil temperature is too high. It will be noted that switching to "reduced power” mode does not modify the operation of the heat engine, and therefore does not reduce the movement performance of the machine.
- the machine also comprises means for switching the operation of the pump back to full power mode, when the oil temperature decreases by a predetermined amplitude.
- Monitoring the temperature drop can be done in different ways.
- the return to full power mode takes place when the temperature of the oil circuit has remained below the previously mentioned triggering threshold, and this for a predetermined duration.
- the decrease in oil temperature is then estimated over a period of time which is a function of the parameters of the hydraulic circuit, which are its volume, its geometry and the like, as well as the characteristics specific to the oil used, and in particular its specific heat.
- the temperature has remained below the predetermined threshold for a given period, of the order of seven minutes, this is sufficient to obtain a lowering of the temperature of the order of 15 ° C, so that it is then possible to authorize operation at full power again.
- the return to full power mode takes place when the temperature drops below a second predetermined threshold.
- the temperature of the oil circuit is then monitored, and a switch to full power mode is authorized when the measurement of this temperature indicates a sufficient reduction.
- the hydraulic circuit can then be equipped with an analog temperature sensor, associated with an electronic control unit, capable of controlling the switching from full power mode to reduced power mode and vice versa, as a function of the comparison of the temperature of the oil circuit with the two predetermined temperature thresholds.
- an analogous result can be obtained by using two separate temperature sensors or probes, having different triggering thresholds, corresponding, for the single highest, to switching to the reduced power mode, and for the lowest threshold. , when reversing, towards full power mode.
- the machine comprises an electronic control control unit, connected to the temperature sensor, and acting on a solenoid valve of the configuration circuit of the variable flow pump.
- the variable flow pump is capable of delivering a flow rate and a pressure corresponding to the power levels of each operating mode.
- the device may also include a specific temperature probe connected to a visual and / or audible alarm present in the cabin.
- a specific temperature probe connected to a visual and / or audible alarm present in the cabin.
- FIG. 1 is a partial simplified diagram of the hydraulic circuit of a machine according to the invention.
- FIG. 2 is a diagram showing the variation of the maximum pressure generated by the pump as a function of the flow rate, and this for two distinct power levels.
- Figure 3 is a timing diagram showing the evolution of the oil temperature over time, when it is regulated according to a first embodiment.
- Figure 4 is a timing diagram similar to that of Figure 3, but corresponding to an alternative embodiment.
- the hydraulic circuit (1) illustrated in FIG. 1 comprises different pipes (2) to or from the various hydraulically controlled members, such as jacks, hydraulic motors or other distributors, without direct relation to the invention, and which will therefore not be described or shown in detail.
- This hydraulic circuit (1) comprises a variable flow pump (4), which is driven by the engine (5) of the machine.
- the pump (4) is connected to the oil tank (12) via a suction line (3).
- the regulation of the flow rate and the pressure delivered by the pump (4) are carried out by a system known per se (6), and which will therefore not be detailed further.
- This regulation device (6) ensures in particular the operation of the pump (4) according to two distinct modes, namely a full power mode and a reduced power mode, in which approximately two thirds of the power are available relative to the mode. full power.
- Switching from one mode to another is controlled by a solenoid valve (7).
- This solenoid valve (7) is controlled as a function of an electrical signal (8) indicating the engagement of a speed at the level of the driving cabin.
- this gear engagement information is processed by an electronic control unit (10).
- the hydraulic circuit comprises a reservoir (12), which is equipped with a temperature probe (13) connected to a visual (14) or audible alarm device, installed in the cabin, in order to warn the driver.
- the hydraulic circuit is equipped with a temperature sensor (20) which, in the illustrated form, is located at the level of the reservoir (12).
- This sensor could be installed in a different location, without however departing from the scope of the invention.
- This sensor (20) can be either an analog sensor, delivering an analog electrical signal, or even a temperature probe, delivering an electrical signal that can adopt two values, depending on whether the temperature it detects is above or below a threshold. preset setting.
- This information (21) is sent to the control unit (10). As a function of this information, the control control unit (10) controls the solenoid valve (7), to force operation of the pump (4) either in full power mode or in reduced power mode.
- the curve Pi corresponding to the operating mode at full power, describes the evolution of the maximum pressure delivered by the pump as a function of the flow rate (Q).
- This pressure Pr is worth a value Pr max up to a flow rate O. Beyond this flow, this pressure decreases to the maximum value of the flow Q max , according to a curve similar to a hyperbola, corresponding to an equipufficient.
- the dotted curve P 2 corresponds to a configuration in which the maximum available power is lower, so that the maximum power delivered by the pump follows the equipufficient hyperbola beyond the flow Q 2 .
- the mode of operation of the invention is as follows.
- the temperature ⁇ of the oil in the hydraulic circuit rises when the machine is used, and this from time instant,.
- the threshold ⁇ i is fixed at a value of the order of 90 ° C, to within plus or minus three degrees.
- the temperature sensor (20) indicates that the oil temperature exceeds the threshold ⁇ j, so that the central control unit (10) controls the solenoid valve (7) appropriately to do switch the pump (4) to reduced power mode. Consequently, the power passing through the hydraulic circuit being lower, the losses due to friction and the like also decrease. The temperature of the oil therefore decreases slightly, and this from tj.
- the transition to reduced power mode also takes place at tj, as soon as the temperature ⁇ exceeds the threshold ⁇ j. Thereafter, the temperature continues to be detected by the sensor (20), and as soon as the information produced by this sensor (20) indicates that the oil temperature has dropped below a threshold ⁇ 2 , the unit command control (10) then authorizes a new transition to full power mode. The temperature then starts to increase again, between instants t 2 and t 3 , then the regulation principle described above applies for the following periods.
- the information relating to the temperature of the oil circuit can be obtained by a single sensor, as illustrated in FIG. 1, but it can also come from two separate sensors which, then, can generate binary information, corresponding to the passage of the temperature above the two thresholds ⁇ i and ⁇ 2 .
- the machine according to the invention has the advantage of providing automatic safety against overheating of the oil circuit, since it reduces the power available at the hydraulic circuit when the temperature exceeds a predetermined threshold.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03780277A EP1543243A1 (fr) | 2002-09-26 | 2003-09-24 | Engin de travaux publics du type chargeur-excavateur, et procede de gestion du fonctionnement d'un tel engin |
AU2003288367A AU2003288367A1 (en) | 2002-09-26 | 2003-09-24 | Loader/excavator-type heavy-construction machine and method of controlling the operation of one such machine |
US11/054,227 US20050150143A1 (en) | 2002-09-26 | 2005-02-09 | Loader/excavator-type heavy construction machine and method of controlling the operation of one such machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR02/11917 | 2002-09-26 | ||
FR0211917A FR2845135A1 (fr) | 2002-09-26 | 2002-09-26 | Vehicule industriel, notamment engin de travaux publics, et procede de gestion du fonctionnement d'un tel vehicule |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/054,227 Continuation US20050150143A1 (en) | 2002-09-26 | 2005-02-09 | Loader/excavator-type heavy construction machine and method of controlling the operation of one such machine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004029459A1 true WO2004029459A1 (fr) | 2004-04-08 |
Family
ID=31985253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/050065 WO2004029459A1 (fr) | 2002-09-26 | 2003-09-24 | Engin de travaux publics du type chargeur-excavateur, et procede de gestion du fonctionnement d'un tel engin. |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1543243A1 (fr) |
AU (1) | AU2003288367A1 (fr) |
FR (1) | FR2845135A1 (fr) |
WO (1) | WO2004029459A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3406850A (en) * | 1964-09-22 | 1968-10-22 | Sperry Rand Corp | Hydraulic system for excavator |
EP0504415A1 (fr) * | 1990-09-28 | 1992-09-23 | Hitachi Construction Machinery Co., Ltd. | Systeme de commande pour pompe hydraulique |
EP0573734A1 (fr) * | 1992-06-10 | 1993-12-15 | Shin Caterpillar Mitsubishi Ltd. | Méthode de contrôle pour une pompe hydraulique entraînée par un moteur |
WO1997014889A1 (fr) * | 1995-10-17 | 1997-04-24 | Brueninghaus Hydromatik Gmbh | Regulation de puissance avec detection de charge |
US5941689A (en) * | 1996-06-03 | 1999-08-24 | Sauer Inc. | Control system and method to control variable hydraulic pumps with a temperature sensor |
WO2002093043A1 (fr) * | 2001-05-16 | 2002-11-21 | Cnh Belgium N.V. | Agencement de commande et procede utilises avec un systeme hydraulique |
-
2002
- 2002-09-26 FR FR0211917A patent/FR2845135A1/fr active Pending
-
2003
- 2003-09-24 AU AU2003288367A patent/AU2003288367A1/en not_active Abandoned
- 2003-09-24 WO PCT/FR2003/050065 patent/WO2004029459A1/fr not_active Application Discontinuation
- 2003-09-24 EP EP03780277A patent/EP1543243A1/fr not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3406850A (en) * | 1964-09-22 | 1968-10-22 | Sperry Rand Corp | Hydraulic system for excavator |
EP0504415A1 (fr) * | 1990-09-28 | 1992-09-23 | Hitachi Construction Machinery Co., Ltd. | Systeme de commande pour pompe hydraulique |
EP0573734A1 (fr) * | 1992-06-10 | 1993-12-15 | Shin Caterpillar Mitsubishi Ltd. | Méthode de contrôle pour une pompe hydraulique entraînée par un moteur |
WO1997014889A1 (fr) * | 1995-10-17 | 1997-04-24 | Brueninghaus Hydromatik Gmbh | Regulation de puissance avec detection de charge |
US5941689A (en) * | 1996-06-03 | 1999-08-24 | Sauer Inc. | Control system and method to control variable hydraulic pumps with a temperature sensor |
WO2002093043A1 (fr) * | 2001-05-16 | 2002-11-21 | Cnh Belgium N.V. | Agencement de commande et procede utilises avec un systeme hydraulique |
Also Published As
Publication number | Publication date |
---|---|
EP1543243A1 (fr) | 2005-06-22 |
AU2003288367A1 (en) | 2004-04-19 |
FR2845135A1 (fr) | 2004-04-02 |
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