EP0946384A1 - Ventilateur a commande hydraulique et servodirection pour vehicule - Google Patents

Ventilateur a commande hydraulique et servodirection pour vehicule

Info

Publication number
EP0946384A1
EP0946384A1 EP97953174A EP97953174A EP0946384A1 EP 0946384 A1 EP0946384 A1 EP 0946384A1 EP 97953174 A EP97953174 A EP 97953174A EP 97953174 A EP97953174 A EP 97953174A EP 0946384 A1 EP0946384 A1 EP 0946384A1
Authority
EP
European Patent Office
Prior art keywords
flow
power steering
fan
hydraulic
steering system
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97953174A
Other languages
German (de)
English (en)
Inventor
Kerry A. Machesney
Jeffrey J. Buschur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Electrical Systems Inc
Original Assignee
ITT Automotive Electrical Systems Inc
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 ITT Automotive Electrical Systems Inc filed Critical ITT Automotive Electrical Systems Inc
Publication of EP0946384A1 publication Critical patent/EP0946384A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/044—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof

Definitions

  • the invention concerns a hydraulically powered fan for a motor vehicle which shares a hydraulic power source with a power steering system.
  • a fan commonly removes heat from liquid coolant, by pumping air over a heat exchanger, or radiator, through which the coolant flows.
  • the fan is commonly driven directly by the engine through a power-transmission belt.
  • fan speed is linked to engine speed: as engine speed increases, the fan speed also increases.
  • crankshaft In a transversely mounted engine, the crankshaft is perpendicular to the direction of travel .
  • the cooling face of the radiator is preferably perpendicular to the ram air stream, which is parallel to the direction of travel. If the disc representing the fan blades is parallel to the cooling surface of the radiator, then the fan's rotational axis is perpendicular to the crankshaft, causing complexity in transferring power from the crankshaft to the fan.
  • An object of the invention is to provide an improved cooling system in an automotive vehicle.
  • Another object of the invention is to provide a cooling system for an automotive vehicle in which power extracted from the engine to power a cooling fan is independent of engine speed.
  • a hydraulic power source in an automotive vehicle supplies power to both a cooling fan and a power steering system, either in parallel or in series, as conditions require.
  • this invention comprises a hydraulic system for use in a vehicle comprising a source of hydraulic pressure, a power steering system, a hydraulic fan system for cooling engine coolant and a switching system for selectively delivering hydraulic pressure to the power steering system and blocking hydraulic pressure from the fan system and delivering hydraulic pressure to both the power steering system and the fan system.
  • this invention comprises a method of delivering hydraulic fluid to components in a vehicle, comprising the following steps delivering flow to a power steering system while delivering no flow to a radiator cooling system during a first flow condition and delivering flow to both the power steering system and the radiator cooling system during a non-first flow condition.
  • FIG. 1 illustrates an overview of operation of one form of the invention
  • Figure 2 illustrates one type of hydraulic circuitry which accomplishes the operation shown in Figure 1 ;
  • Figure 3 illustrates how the hydraulic circuitry of Figure 2 provides hydraulic power exclusively to the power steering system shown in Figure 1
  • Figure 4 illustrates how the hydraulic circuitry of Figure 2 provides hydraulic power to both the power steering system and the fan system shown in Figure 1;
  • FIG. 5 illustrates logic implemented by one form of the invention.
  • Figure 1 illustrates a simplified overview of one form of the invention which is used in a motor vehicle.
  • the invention switches between the two modes of operation shown in Figure 1.
  • the left side of Figure 1 shows hydraulic power being delivered to a power steering system 3, by a pump
  • FIG. 1 The right side of Figure 1 shows hydraulic power being delivered, in parallel, to both the power steering system 3 , and the fan system 12 as indicated by the pair of dotted paths 9 and 15.
  • the pump 6 provides sufficient output 10 to satisfy both systems 3 and 12 at low rpms, such as less than 1500 or 2000 rpms
  • a priority flow divide 81 described later herein provides the priority function by making sure that the power steering system's 3 flow requirements are met before delivering excess flow to fan system 12.
  • the right side of Figure 1 is a normal operation, and the left side represents an operating mode that occurs if there is a reduction of flow, such as below the flow requirements of the steering system 3.
  • Figure 2 illustrates one type of hydraulic circuitry which accomplishes the implementation shown in Figure 1.
  • the group of components 18 correspond to the pump 6 of Figure 1.
  • Components 18 include a fixed displacement pump 21, a relief valve 24, a pressure sensor 27, and an adjustable throttling valve 30.
  • "Fixed displacement” means, speaking generally, that every revolution of the rotor (not shown) of the pump 21 produces a given volume of output. That is, the amount of fluid which the pump "displaces" per revolution is fixed. Thus, at higher speeds, the pump produces a greater volume of output due to a greater number of rotations per second.
  • sensor 27 directs the fluid flow through a venturi (not shown) .
  • the pressure sensed by the sensor 27, corresponds to the flow rate through the venturi.
  • This pressure is fed to the variable throttling valve 30, which opens and closes, according to a schedule (not shown), based on the pressure sensed by sensor 27. For example, when sensor 27 senses a low pressure, as at engine idle, the schedule may cause adjustable valve 30 to remain closed, causing all of the output of the pump 21 to be delivered to line 42. At a higher speed, as at 2,000 rpm, the schedule may cause the adjustable valve 30 to open a significant amount, thus dumping some amount of flow into the reservoir 10.
  • the relief valve 24 acts as protection in the event that the output pressure, in line 42, becomes excessive.
  • adjustable valve 30 opens and closes as output of the pump 21 changes in order to provide the proper flow rate in line 42.
  • a variable displacement pump (not shown) can be used. Such a pump maintains a constant volumetric flow, irrespective of engine speed.
  • the fan system 12 of Figure 1 can be viewed as including three components shown in Figure 2, namely: a fan motor 51, a fan speed control valve 48, and a relief valve 45.
  • the relief valve 45 acts as protection in the event that the input pressure to the fan motor 51, in line 54, becomes excessive.
  • the fan speed control valve 48 controls speed of the fan motor 51 by causing fluid to bypass the fan motor 51.
  • the system 12 is designed such that all fluid entering line 54 bypasses the fan motor 51.
  • the valve 48 is fully closed, all fluid entering line 54 enters the fan motor 51.
  • intermediate positions of valve 48 intermediate amounts of fluid reach the fan motor 51.
  • the relief valve 45 to be closed, as is the case in normal operation, the amount by which valve 48 is open controls the speed of the fan motor 51.
  • the power steering system 3 of Figure 1 can be viewed as including three components of Figure 2, namely: a steering valve 60, a steering assembly 63, and a relief valve 66.
  • the relief valve 66 serves as protection in case the pressure to the input of the steering valve 60, in line 57, becomes too great. Ordinarily, the relief valve 66 is closed.
  • the steering valve 60 is a valve which selectively directs pressure to lines 72 and 75, to a steering assembly 63 to assist a driver of the vehicle in operating the steering wheels.
  • FIG. 3 illustrates how the hydraulic circuitry of Figure 2 accomplishes the parallel operation of Figure 1.
  • a priority flow divider 81 allows flow indicated by the dashed path 100. Flowpath 100 is directed through steering valve 60, through line 57. After exiting the steering valve 60, the flow reaches line 115, which joins line 109 at junction 121, en route to the reservoir 10.
  • the priority flow divider 81 is a conventional divider which partially or completely blocks flow through its first outlet 81A while measuring a flow parameter at its second outlet 8IB, such as flow rate. When that flow parameter reaches a threshold, such as a minimum flow rate, then the priority flow divider 81 opens flow to its first outlet 81A.
  • Figure 4 illustrates how the hydraulic circuitry of Figure 2 accomplishes the parallel operation mode shown at the right side of Figure 1. It should be appreciated that this is the normal operating state. If, however, the flow in the hydraulic systems 3 and 12 fall below a predetermined minimum, then divider 81 will deliver all output of pump 6 to the steering system 12. This has the advantage of causing steering system 12 and fan system 3 to operate in parallel during high engine rpms (such as in excess of, for example, 2000 rpms) .
  • the flow parameter through the second outlet 81B has exceeded the threshold, so the priority flow divider 81 opens its first outlet 81A, creating the flowpath indicated by dotted line 103. From line 54, the flow reaches the fan motor 51, and, upon exiting the fan motor 51, reaches outlet line 109, which connects with the reservoir 10.
  • Electronic pressure sensors can be used, for example, to detect when flow in second outlet 81B is sufficient to trigger opening of the first outlet 81A.
  • the required size of pump 4 at engine idle speed is dictated by the fixed flow rate at outlet 81B which feeds the steering system 3.
  • Conventional approaches of addressing increased flow rate needs in a hydraulic system is, for example, to provide a larger pump or increase engine speed.
  • features of the present invention may be used with conventional variable effort and speed sensitive steering systems (not shown) so that the outlet 8IB may be provided such that it provides a flow which is responsive to, for example, electrical inputs from the variable effort or speed sensitive steering systems.
  • This will permit the flow directed to outlet 81A to be variable and available a greater percentage of the time, such as at low engine speeds. Consequently, the features of this invention provide means for eliminating or reducing the needs for a larger pump 21 or change in engine speed.
  • Figure 5 illustrates logic which the invention implements.
  • the ignition computer of the vehicle also called the "onboard computer” can be used to perform the logic.
  • decision block 200 it is determined whether flow is sufficient for parallel operation (i.e., whether flow is sufficient to supply the fan system and the power steering system in parallel) . If so, then the logic reaches block 205, indicating that parallel flow is provided, as by the hydraulic circuit of Figure 3. If not, the logic reaches block 210, indicating that flow exclusively to the power steering system 3 is provided, as by the hydraulic circuit of Figure 3. The logic then returns to block 200, and repeats.
  • this system and method provide means for dividing and/or prioritizing flow among a plurality of hydraulic components using a single flow divider.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention concerne un système hydraulique pour véhicule automobile. Une source de pression hydraulique fonctionne en deux modes. Dans un mode (qui est le mode de fonctionnement normal), elle alimente en parallèle un ventilateur de radiateur (12) et une servodirection (3). Dans un autre mode de fonctionnement, un diviseur de débit de priorité (81) alimente uniquement la servodirection (3) lorsque l'écoulement hydraulique baisse au-dessous d'un minimum correspondant généralement à l'écoulement requis par la servodirection (3).
EP97953174A 1996-12-24 1997-12-10 Ventilateur a commande hydraulique et servodirection pour vehicule Withdrawn EP0946384A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US773101 1991-10-08
US77310196A 1996-12-24 1996-12-24
PCT/US1997/022801 WO1998028179A1 (fr) 1996-12-24 1997-12-10 Ventilateur a commande hydraulique et servodirection pour vehicule

Publications (1)

Publication Number Publication Date
EP0946384A1 true EP0946384A1 (fr) 1999-10-06

Family

ID=25097213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97953174A Withdrawn EP0946384A1 (fr) 1996-12-24 1997-12-10 Ventilateur a commande hydraulique et servodirection pour vehicule

Country Status (3)

Country Link
EP (1) EP0946384A1 (fr)
JP (1) JP2001507650A (fr)
WO (1) WO1998028179A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0946383B1 (fr) * 1996-12-24 2002-03-20 Itt Automotive Electrical Systems, Inc. Ventilateur de radiateur et direction assistee de vehicule commandes hydrauliquement

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044607A1 (de) * 2000-09-08 2002-04-04 O & K Mining Gmbh Verfahren und Einrichtung zur Regelung eines Lüfterantriebes einer Brennkraftmaschine in Bau- und/oder Arbeitsmaschinen
AU2003278807A1 (en) 2002-03-01 2004-08-13 Bracco International B.V. Kdr and vegf/kdr binding peptides and their use in diagnosis and therapy
US7261876B2 (en) 2002-03-01 2007-08-28 Bracco International Bv Multivalent constructs for therapeutic and diagnostic applications
US7794693B2 (en) 2002-03-01 2010-09-14 Bracco International B.V. Targeting vector-phospholipid conjugates
US8623822B2 (en) 2002-03-01 2014-01-07 Bracco Suisse Sa KDR and VEGF/KDR binding peptides and their use in diagnosis and therapy
KR101846576B1 (ko) * 2012-12-11 2018-04-06 현대자동차주식회사 조향펌프 기능이 통합된 유압식 쿨링시스템 및 그 제어방법
JP2016530432A (ja) 2013-07-08 2016-09-29 マグナ パワートレイン バート ハンブルグ ゲーエムベーハー 可変容量ポンプ及びギヤボックス制御システム
US12319190B2 (en) * 2021-03-19 2025-06-03 Hitachi Construction Machinery Co., Ltd. Dump truck

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63141878A (ja) * 1986-12-01 1988-06-14 Jidosha Kiki Co Ltd パワ−ステアリング・システム
JP2805921B2 (ja) * 1989-12-08 1998-09-30 株式会社デンソー 車両用発電システム
DE4336892A1 (de) * 1992-10-29 1994-05-05 Aisin Seiki Fluiddruckantriebssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9828179A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0946383B1 (fr) * 1996-12-24 2002-03-20 Itt Automotive Electrical Systems, Inc. Ventilateur de radiateur et direction assistee de vehicule commandes hydrauliquement

Also Published As

Publication number Publication date
JP2001507650A (ja) 2001-06-12
WO1998028179A1 (fr) 1998-07-02

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