WO2022229729A1 - Unité de pompage d'un système pour empêcher le phénomène d'aquaplanage dans un véhicule à moteur - Google Patents

Unité de pompage d'un système pour empêcher le phénomène d'aquaplanage dans un véhicule à moteur Download PDF

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Publication number
WO2022229729A1
WO2022229729A1 PCT/IB2022/052639 IB2022052639W WO2022229729A1 WO 2022229729 A1 WO2022229729 A1 WO 2022229729A1 IB 2022052639 W IB2022052639 W IB 2022052639W WO 2022229729 A1 WO2022229729 A1 WO 2022229729A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
vehicle
motor
fluid
pumping unit
Prior art date
Application number
PCT/IB2022/052639
Other languages
English (en)
Inventor
Giovanni BLANDINA
Original Assignee
Easy Rain I.S.P.A.
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 Easy Rain I.S.P.A. filed Critical Easy Rain I.S.P.A.
Publication of WO2022229729A1 publication Critical patent/WO2022229729A1/fr

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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/047—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being pin-and-slot mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B39/00—Increasing wheel adhesion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B39/00—Increasing wheel adhesion
    • B60B39/02—Vehicle fittings for scattering or dispensing material in front of its wheels
    • B60B39/021—Details of the dispensing device
    • B60B39/025—Details of the dispensing device related to the control system
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/70—Adaptation for
    • B60B2900/721—Use under adverse external conditions
    • 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
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston

Definitions

  • a pumping unit of a system for preventing the phenomenon of aquaplaning in a motor-vehicle A pumping unit of a system for preventing the phenomenon of aquaplaning in a motor-vehicle
  • the present invention relates in general to a system for preventing the phenomenon of aquaplaning in a motor-vehicle.
  • the invention relates to a pumping unit of a system for preventing the phenomenon of aquaplaning in a motor-vehicle, configured to generate the operating pressure of a jet of fluid directed onto a road surface.
  • aquaplaning is a phenomenon that may occur when a moving motor-vehicle encounters a layer of water extended on the road surface, in such a quantity as to no longer allow adequate adhesion between the wheels of the vehicle and the road surface. Consequently, in these conditions, a condition occurs of lifting and/or skidding of the wheels on the wet road surface, with consequent loss of grip of the tires.
  • One of the major problems of the known solutions consists in generating adequate flow rate and pressure of the jet of fluid, as well as extremely rapid intervention times, in order to ensure an effective anti-aquaplaning action.
  • the object of the invention is to provide a pumping unit of the type indicated above, which guarantees high pressures of the jet of fluid, and particularly rapid intervention times.
  • Another object of the invention is to create a pumping unit of the type indicated above that is extremely reliable in operation and that does not interfere with other components and systems of the vehicle, when an anti-aquaplaning action is not required.
  • Another object of the invention is to create a pumping unit of the type indicated above that can be easily installed on-board a motor-vehicle.
  • Another object of the invention is to provide a pumping unit of the type indicated above that can be easily integrated with other components of the system.
  • the aforesaid objects are achieved by a system and a relative method for preventing the phenomenon of aquaplaning in a vehicle, having the characteristics forming the subject of the attached claims.
  • FIG. 1 is a schematic perspective view that illustrates a preferred embodiment of the system according to the invention
  • FIG. 2 is a schematic view that illustrates the components and the operation of a preferred embodiment of the system according to the invention
  • FIG. 3 is an additional schematic perspective view that illustrates different components of the system of Figure 1 ,
  • FIGS. 4A-4C are a perspective view, an exploded perspective view, and a cross-sectional view illustrating a preferred embodiment of a pumping unit according to the present invention.
  • FIG. 5-8 are perspective views on an enlarged scale illustrating different components of the pumping unit of Figures 4A-4C.
  • Figures 1-3 are schematic views illustrating a preferred embodiment of an anti-aquaplaning system S that can be installed on-board a motor-vehicle V, designed to restore the correct contact of the wheels W of the motor-vehicle V on a wet road surface.
  • the system S comprises at least one fluid reservoir 8 and injector means 9 configured to direct a jet of high pressure fluid onto the wet road surface, so as to remove the layer of water that stagnates on said surface.
  • the injector means 9 are associated with at least one wheel of the motor-vehicle V, preferably in front of the treads of the front wheels W.
  • the system S comprises a pumping unit 1 configured to generate the operating pressure of the jet of fluid directed onto the road surface.
  • the pumping unit 1 is operatively interposed between the reservoir 8 and the injector means 9.
  • the references 30, 31 , 32, 33, 34, 35 indicate a plurality of hydraulic ducts designed to connect the various components, while the references 40, 41 , 42, 43 indicate the logical functional connections between the components of the system S.
  • the jet of fluid injected by the injector means 9 is taken from the reservoir of screen-washing fluid of the motor-vehicle V.
  • Reference 8’ indicates an auxiliary reservoir, which houses an auxiliary liquid, preferably a defoaming liquid.
  • a mixing assembly 11 is hydraulically connected to the reservoir 8 and to the auxiliary reservoir 8’.
  • the fluid supply is ensured by a pumping unit 1 comprising an intake mouth 12 and a delivery mouth 13. Still with reference to the schematic view of Figure 2, it can be observed that the pumping unit 1 comprises an electric motor 5 and a braking device, the operation of which is described in detail below.
  • the references 14 indicate two non return valves, arranged, respectively, upstream of the intake mouth 12 and downstream of the delivery mouth 13.
  • a respective solenoid valve 16 is arranged upstream of each injector 9, and is configured to selectively enable a transit of fluid, so as to allow the emission of the jet of fluid.
  • the system S further comprises a safety valve 21 arranged to control and limit the pressure of the circuit.
  • the system S also comprises an accumulator 15 designed to keep the entire circuit under pressure, and to prevent having to install a damping spring inside the pumping unit 1 , so as to be able to reduce the weight of the pumping unit 1 and its mechanical complexity.
  • the system S also comprises an electronic control unit E associated with at least one sensor configured to detect the dynamic conditions of the motor- vehicle V and/or the environment wherein the vehicle V is located (in particular the conditions of the road surface).
  • the control unit E is configured to control the injector means 9 and the electric motor 5, so as to generate a jet of fluid by means of the pumping unit 1 , according to the conditions detected.
  • said at least one sensor comprises at least one sensor already mounted on-board the vehicle V, in order to share the functionalities and to reduce the production costs of the system S according to the present invention.
  • said at least one sensor comprises at least one sensor of the following typologies:
  • an angular speed sensor to determine if all the wheels of the vehicle V rotate at the same speed, if a curved path is being followed, or if one or more wheels are accelerating or decelerating without warning;
  • Safety systems may then be associated with said at least one sensor (for example, of type ABS, ESP and the like), which are usually mounted on-board the vehicle V; these security systems allow the provision of information relative to the speed and acceleration of the vehicle V, the angular velocity and steering for every wheel, the presence of water on the street surface, braking conditions, and so on.
  • said at least one sensor for example, of type ABS, ESP and the like
  • these security systems allow the provision of information relative to the speed and acceleration of the vehicle V, the angular velocity and steering for every wheel, the presence of water on the street surface, braking conditions, and so on.
  • said at least one sensor may comprise sensors specifically studied and conceived for the system S, such as, for example, an infrared sensor suitable for verifying the presence of an anomalous layer of water that is about to be reached by the vehicle, and so on.
  • FIGS 4A-4C illustrate a preferred embodiment of a pumping unit 1 , according to the invention.
  • the pumping unit 1 is a volumetric single-cylinder piston pump, configured to generate the operating pressure of the jet of fluid to be directed onto the road surface by means of the injector means 9.
  • a high pressure volumetric pump generally comprises at least one piston, slidably housed inside a cylinder, so as to define therewith a variable volume pumping chamber, which communicates with an intake duct and a delivery duct through respective valves.
  • the piston is controlled to alternatively perform an intake stroke, wherein the volume of the relative operating chamber increases by recalling the fluid from the intake valve, and a delivery stroke, wherein it reduces the volume of the operating chamber, forcing the fluid to exit under pressure from the delivery valve.
  • the pumping unit 1 comprises a pump body 10, preferably made of steel, within which a pumping chamber defined by a cylinder-piston assembly 2 is formed.
  • the cylinder-piston assembly 2 is spaced along a pumping axis X1 and comprises a cylinder 3 within which a piston 4 is slidably mounted.
  • the cylinder 3 is connected with an intake pipe 31 and a delivery pipe 32.
  • the piston 4 can be moved forward and backward to vary the useful volume of the cylinder 3 by means of a screw-nut mechanism 22 designed to convert a rotary movement into a linear movement.
  • Reference 5 indicates an electric motor designed to develop the drive torque required to operate the pumping unit 1.
  • the electric motor 5 comprises a crankshaft 50 operatively connected to the aforesaid screw-nut mechanism 22, according to the characteristics indicated below.
  • the crankshaft 50 is spaced along a second axis X2 different from the aforesaid pumping axis X1.
  • the electric motor 5 and the pumping chamber are arranged side-by-side with respect to each other, with the axes X1 , X2 parallel to each other.
  • the pumping unit 1 comprises a gear train transmission 6 arranged to transmit the motion from the electric motor 5 to the screw-nut mechanism 22 associated with the piston 4, also guaranteeing the transmission ratio required to reduce the rotation speed from the crankshaft 50 to the screw-nut mechanism 22.
  • the transmission comprises a plurality of gear wheels including a driving wheel 60 integral with the crankshaft 50, a driven wheel 62 integral with the piston 4, and at least one intermediate wheel 61 , designed to transmit the rotation motion from the crankshaft 50 to the screw-nut mechanism 22 (Figure 5).
  • the gear train transmission 6 is also arranged to reduce the rotation speed of the motor 5 to a value compatible with the screw-nut mechanism 22.
  • the gear ratio is 1/5.
  • the pumping unit 1 has a relatively limited overall length, allowing easy installation on-board the motor-vehicle V, in particular, in an area of the engine compartment near the front bumper at the height of the headlights.
  • the pumping unit 1 comprises a screw-nut mechanism 22 designed to convert a rotation movement - transmitted by the crankshaft 50 to the driven wheel 62 - into a linear movement - to be transmitted to the piston 4.
  • the mechanism 22 comprises a rod 19 axially spaced within the piston 4, and operatively connected to the driven wheel 62, so that the wheel 62 rotates the rod 19.
  • the mechanism 22 also comprises a tubular flange 20 fixed to one end 24 of the piston 4, bearing an inner thread engaged with an outer thread (not shown in the drawings) obtained along the outer surface of the rod 19.
  • the driven wheel 62 drives the rod 19 into rotation, whose rotation causes an axial displacement of the tubular flange 20 and of the piston 4.
  • the mechanism 22 also comprises a set of bearings 18 to reduce the friction resulting from the rotation of the rod 19.
  • the piston 4 is made of aluminum alloy, so as to be able to withstand the stresses generated by the operating pressures.
  • the piston 4 has a configuration designed to optimize operation, preventing the piston 4 from rotating with the rod 19.
  • the piston 4 comprises a plurality of recesses 25 formed along the body of the piston 4, arranged to lighten the overall weight of the piston 4 and to allow the piston 4 to be tightened with a nut screw.
  • the piston 4 comprises sealing means arranged to seal the piston 4, ensuring an efficient movement with minimum friction.
  • the sealing means may comprise at least one annular gasket 26 (O-ring) made of elastomeric material, coaxially interposed between the piston skirt and the seat wherein the piston skirt is slidably received.
  • the piston 4 is also shaped to be able to accommodate a plurality of mutually spaced-apart seals along the direction defined by the longitudinal axis of the piston 4.
  • the pumping unit 1 comprises two position sensors 23 for detecting the stroke- end positions of the piston 4. The sensors 23 are positioned at opposite ends of the cylinder 3, and are designed to prevent damage to the piston 4 in the event of anomalies relating to position control.
  • the pumping unit 1 also comprises a braking device 7 associated with the electric motor 5, designed to lock the operation of the pumping unit 1 during a rest condition of the system S, wherein the emission of the jet of fluid is not required.
  • the braking device 7 is an electromagnetic brake comprising a solenoid designed to lock the pumping unit 1 during a rest condition of the system S.
  • the electromagnetic brake comprises spring means capable of pushing a ferromagnetic anchor into a position configured for keeping the piston 4 in a locked position, and an electromagnet designed to magnetically attract the anchor into a position configured for allowing operation. Therefore, in a normal rest condition wherein the emission of the jet of fluid is not required, the braking device 7 produces a braking effect that locks the pumping unit 1. Note that the overall time to unlock the pumping mechanism is approximately 50 ms. It should also be noted that the braking device 7 is capable of keeping the pumping unit 1 under pressure.
  • the pumping unit 1 comprises an accumulator 15 arranged to provide a reserve of fluid, regulating delivery and supply pressure of the fluid, so as to keep the hydraulic circuit under pressure, even during a rest condition of the system S, thus reducing the overall intervention time to generate the emission of the jet of fluid.
  • the accumulator 15 is also designed to dampen the reaction forces and to prevent having to install damping springs inside the pumping unit 1 , so as to avoid an increase in weight and complexity of the pumping unit 1.
  • the pumping unit 1 comprises a fastening bracket 17 designed to secure the pump body 10 in the engine compartment of a motor-vehicle, preferably made of steel.
  • the fastening bracket 17 is sized to avoid structural anomalies linked to phenomena of local cyclic plastic micro deformations induced by the cycle of stresses.
  • the pumping unit 1 is capable of achieving the required flow rate - with the necessary pressure increase - to achieve the required effect.
  • the injection pressure developed is 60 - 150 bars.
  • the volumetric pumping unit 1 is designed to generate adequate pressure and flow rate of a jet of fluid directed onto the road surface in an anti-aquaplaning system. According to the advantageous characteristics described above, the pumping unit 1 is made in such a way as to ensure particularly rapid intervention times and extremely reliable operation, while at the same time being easily installed on board a motor-vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Regulating Braking Force (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

Unité de pompage (1) d'un système (S) pour empêcher le phénomène d'aquaplanage dans un véhicule à moteur (V), configurée pour générer la pression de fonctionnement d'un jet de fluide dirigé sur une surface de route. L'unité de pompage (1) comprend : - un ensemble cylindre-piston (2) comprenant un cylindre (3) à l'intérieur duquel un piston (4) s'étendant le long d'un axe de pompage (X1) est monté de manière coulissante, - le piston (4) peut être entraîné vers l'avant et vers l'arrière pour faire varier le volume effectif du cylindre (3), au moyen d'un mécanisme à vis-écrou (22) prévu pour convertir un mouvement de rotation en un mouvement linéaire, - un moteur électrique (5) comprenant un vilebrequin (50) s'étendant le long d'un second axe (X2) décalé par rapport à l'axe de pompage (X1) et relié de manière fonctionnelle au mécanisme vis-écrou (22), - une transmission de train d'engrenages (6) prévue pour transmettre le mouvement de rotation à partir du vilebrequin (50) au mécanisme vis-écrou (22), assurant le rapport de transmission requis, et - un dispositif de freinage (7) prévu pour verrouiller le fonctionnement de l'unité de pompage (1) lors d'une étape de fonctionnement du véhicule à moteur (V), l'émission du jet de fluide n'étant pas nécessaire.
PCT/IB2022/052639 2021-04-30 2022-03-23 Unité de pompage d'un système pour empêcher le phénomène d'aquaplanage dans un véhicule à moteur WO2022229729A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102021000011117A IT202100011117A1 (it) 2021-04-30 2021-04-30 Unità di pompaggio di un sistema per evitare il fenomeno di aquaplaning in un autoveicolo
IT102021000011117 2021-04-30

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Publication Number Publication Date
WO2022229729A1 true WO2022229729A1 (fr) 2022-11-03

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PCT/IB2022/052639 WO2022229729A1 (fr) 2021-04-30 2022-03-23 Unité de pompage d'un système pour empêcher le phénomène d'aquaplanage dans un véhicule à moteur

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IT (1) IT202100011117A1 (fr)
WO (1) WO2022229729A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0422767A (ja) * 1990-05-16 1992-01-27 Aioi Seiki Kk プランジャ型液圧ポンプ
JPH07286576A (ja) * 1994-04-19 1995-10-31 Kaken Kogyo:Kk 往復式流体圧力装置
US20040262425A1 (en) * 2003-06-26 2004-12-30 Moriharu Sakai Slip-stop device for preventing slipping of vehicle wheels
EP2107669A2 (fr) * 2008-03-31 2009-10-07 Sanyo Denki Co., Ltd. Moteur doté d'un frein électromagnétique
US20150082925A1 (en) * 2013-09-25 2015-03-26 Molon Motor And Coil Corporation Gear Motor Pump Assembly
EP2855166A1 (fr) * 2012-06-01 2015-04-08 Easy Rain I.s.r.l. Dispositif anti-aquaplaning pour véhicule
DE102014225578A1 (de) * 2014-12-11 2016-06-16 Robert Bosch Gmbh Pumpenvorrichtung für ein Bremssystem eines Fahrzeugs
CN107131110A (zh) * 2017-06-02 2017-09-05 三六度(中国)有限公司 丝杆式气泵结构及气垫鞋
US20200198433A1 (en) * 2013-04-23 2020-06-25 ClearMotion, Inc. Active suspension with structural actuator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0422767A (ja) * 1990-05-16 1992-01-27 Aioi Seiki Kk プランジャ型液圧ポンプ
JPH07286576A (ja) * 1994-04-19 1995-10-31 Kaken Kogyo:Kk 往復式流体圧力装置
US20040262425A1 (en) * 2003-06-26 2004-12-30 Moriharu Sakai Slip-stop device for preventing slipping of vehicle wheels
EP2107669A2 (fr) * 2008-03-31 2009-10-07 Sanyo Denki Co., Ltd. Moteur doté d'un frein électromagnétique
EP2855166A1 (fr) * 2012-06-01 2015-04-08 Easy Rain I.s.r.l. Dispositif anti-aquaplaning pour véhicule
US20200198433A1 (en) * 2013-04-23 2020-06-25 ClearMotion, Inc. Active suspension with structural actuator
US20150082925A1 (en) * 2013-09-25 2015-03-26 Molon Motor And Coil Corporation Gear Motor Pump Assembly
DE102014225578A1 (de) * 2014-12-11 2016-06-16 Robert Bosch Gmbh Pumpenvorrichtung für ein Bremssystem eines Fahrzeugs
CN107131110A (zh) * 2017-06-02 2017-09-05 三六度(中国)有限公司 丝杆式气泵结构及气垫鞋

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "Electromagnetic brake - Wikipedia", 30 October 2018 (2018-10-30), XP055720485, Retrieved from the Internet <URL:https://en.wikipedia.org/w/index.php?title=Electromagnetic_brake&oldid=866492219> [retrieved on 20200805] *

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