EP1891307A1 - Oil pump control system - Google Patents

Oil pump control system

Info

Publication number
EP1891307A1
EP1891307A1 EP06765438A EP06765438A EP1891307A1 EP 1891307 A1 EP1891307 A1 EP 1891307A1 EP 06765438 A EP06765438 A EP 06765438A EP 06765438 A EP06765438 A EP 06765438A EP 1891307 A1 EP1891307 A1 EP 1891307A1
Authority
EP
European Patent Office
Prior art keywords
control system
oil
pump
oil pump
solenoid valve
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.)
Granted
Application number
EP06765438A
Other languages
German (de)
French (fr)
Other versions
EP1891307B1 (en
Inventor
Giacomo Armenio
Raffaele Squarcini
Massimiliano Lazzerini
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.)
Pierburg Pump Technology Italy SpA
Original Assignee
Pierburg SpA
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 Pierburg SpA filed Critical Pierburg SpA
Publication of EP1891307A1 publication Critical patent/EP1891307A1/en
Application granted granted Critical
Publication of EP1891307B1 publication Critical patent/EP1891307B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity

Definitions

  • the present invention relates to an oil pump control system.
  • VOP variable displacement vane pumps
  • Figure 1 shows the usual pattern of an engine demand curve (a) compared against the pattern of a curve (b) related to a traditional gear pump, and of a curve (c) referred to a traditional variable displacement vane pump
  • area Al comprised between curve (a) and curve (b) represents the lost energy with respect to that strictly needed for pumping lubricant oil towards the endothermic engine by means of a gear oil pump.
  • area Al comprised between curve (a) and curve (b) represents the lost energy with respect to that strictly needed to pump lubricant oil towards the endothermic engine by means of a variable displacement vane pump (VOP) .
  • VOP variable displacement vane pump
  • the present invention aims to make a two- level pressure adjustment system by means of which, especially at low speed and low temperature, the actual pump-related curves do not exceed the endothermic engine curve (a) very much. In this way, a system for dissipating less energy is made.
  • FIG. 2 shows a first configuration of a first embodiment of a gear oil pump control system according to the present invention
  • FIG. 3 shows a second configuration of the first embodiment of a gear oil pump control system according to the present invention
  • - figure 4 shows a first configuration of a second embodiment of a variable displacement vane pump (VOP) control system according to the present invention
  • - figure 5 shows a second configuration of the second embodiment of a variable displacement vane pump (VOP) control system according to the present invention
  • FIG. 6 shows the usual pattern of the engine demand curve (a) compared against the pattern of a gear pump-related curve (b*) for a system according to the present invention, and, respectively, against the pattern of a curve (c*) related to a variable displacement vane pump (VOP) for a system according to the present invention.
  • number 100 indicates a gear pump belonging to a control system 200 object of the present invention.
  • the gear pump 100 conveys oil at a certain pressure P through a primary hydraulic circuit 101 towards an endothermic engine (not shown) for lubricating it.
  • Device 103 is provided with a chamber 104, which envisages an oil inlet 105 and an oil outlet 106 from the primary circuit 101.
  • the oil released from output 106 is conveyed towards a first drain SCl.
  • a shutter 107 subjected to the elastic forces exerted by a spring 108.
  • the shutter 107 comprises, in turn, a piston 109 and a plunger 110 reciprocally connected by a stem 111.
  • the bottom of the chamber 104 is provided with a further outlet 112 from which departs a conduit 113 that leads to a second drain SC2. Furthermore, the conduit 113 is provided with a solenoid valve 114 which is closed in the configuration shown in figure 1.
  • the plunger 110 splits chamber 104 into a first portion 104a comprised between a lower surface 109a of piston 109 and an upper surface 110a of plunger 110, and a second portion 104b defined by a lower surface 110b of the piston 110 and a bottom 115 of chamber 104.
  • Both the first portion 104a and a second portion 104b (with solenoid valve 114 closed) (figure 2) are full of oil.
  • solenoid valve 114 is closed and controlled by an electronic control unit (not shown) which takes rpm and temperature of the endothermic engine into account. In this way, the pressures on the surfaces 110a and 110b of the plunger 110 balance and the resulting pressure acts only on surface 109a of piston 109 (highlighted in bold) .
  • chamber 104a of chamber 104 is such to apply a force on the surface 109a (highlighted in bold) which raises the shutter 107 in a direction and sense defined by an arrow Fl (figure 2) .
  • solenoid valve 114 is open (figure 3) , the working force of the oil existing in portion 104a which acts on the piston 109 is that generated by the pressure of the oil itself acting on portions 116 (highlighted in bold in figure 3) of surface 109a.
  • the other forces which act on the rest of the surface 109a will be balanced by those acting on surface 110a.
  • the shutter 107 will therefore be lowered in a direction and sense defined by an arrow F2 (figure 3) .
  • Figures 4 and 5 show a second embodiment of the present invention in which a variable displacement vane pump 300 is used.
  • System 400 envisages, in a way entirely similar to that seen for the first embodiment shown in figures 2 and 3, a primary lubrication circuit 301 from which a secondary circuit 302 that leads to a drain SC3 departs.
  • the secondary circuit 302 envisages a solenoid valve 303 which is open in the configuration shown in figure 4 and therefore the secondary circuit 302 drains into drain SC3.
  • the solenoid valve 303 When the rpm exceeds a certain value N** (figure 6) , the solenoid valve 303, controlled by the electronic control unit, closes the secondary circuit 302, the chamber 304 is filled with oil which may be only discharged through the primary circuit 301 towards a shutter device 307. In this way, the displacement of the pump 300 is adjusted by the stiffness of a spring 308, which acts on a shutter 309, by the pressure of the oil in the chamber 304 and in chamber 305, as in variable displacement vane pumps of the traditional type.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

An oil pump control system (200; 400) comprising an oil pump (100; 300) and a primary lubrication circuit (101; 301) . The control system (200; 400) is characterised in that it envisages a secondary circuit (102; 302) comprising, in turn, a solenoid valve (114; 303) whose opening/closing is controlled by an electronic control unit. The secondary circuit (102; 302) achieves the adjustment between two values (P*, P**) of the delivery pressure in the primary lubrication circuit (101; 301) to save pumping energy.

Description

OIL PUMP CONTROL SYSTEM
TECHNICAL FIELD
The present invention relates to an oil pump control system.
BACKGROUND ART
As known, both gear pumps and variable displacement vane pumps (VOP) adjust delivery pressure to only one setting. This means that the pump, especially at high rpm, conveys oil at pressure exceeding, also by a high degree, that actually required by the endothermic engine.
Figure 1 shows the usual pattern of an engine demand curve (a) compared against the pattern of a curve (b) related to a traditional gear pump, and of a curve (c) referred to a traditional variable displacement vane pump
(VOP) , respectively.
In figure 1, the engine (and pump) rpm is shown on the abscissa while the corresponding pressures are shown on the ordinate. Obviously, the subtended areas of the various curves (a) (b) (c) represent the energies corresponding to endothermic engine demand, to the demand of a traditional gear pump (curve (b) ) mechanically connected to the endothermic engine itself, and to the needs of a variable displacement vane pump (VOP) (curve (c) ) , respectively.
Furthermore, as shown in figure 1, area Al comprised between curve (a) and curve (b) represents the lost energy with respect to that strictly needed for pumping lubricant oil towards the endothermic engine by means of a gear oil pump. Similarly, area Al comprised between curve (a) and curve (b) represents the lost energy with respect to that strictly needed to pump lubricant oil towards the endothermic engine by means of a variable displacement vane pump (VOP) . Indeed, in ideal conditions, by means of ideal continuous adjustments, curve (b) and curve (c) respectively should essentially coincide with curve (a) .
In practice, devices are made for performing essentially continuous adjustments. However, in order to obtain this, the oil pumps must be adjusted by means of complicated hydraulic systems and controlled by electronic control units which make production cost thereof very high. DISCLOSURE OF INVENTION Therefore, it is the object of the present invention to give an easily implementable and low-cost solution adapted to decrease the surface of areas Al or A2 as much as possible.
Therefore, the present invention aims to make a two- level pressure adjustment system by means of which, especially at low speed and low temperature, the actual pump-related curves do not exceed the endothermic engine curve (a) very much. In this way, a system for dissipating less energy is made.
Therefore, according to the present invention, an oil pump control system is obtained according to the attached claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described with reference to the accompanying drawings illustrating two non-limitative embodiments thereof, in which:
- figure 2 shows a first configuration of a first embodiment of a gear oil pump control system according to the present invention;
- figure 3 shows a second configuration of the first embodiment of a gear oil pump control system according to the present invention;
- figure 4 shows a first configuration of a second embodiment of a variable displacement vane pump (VOP) control system according to the present invention; - figure 5 shows a second configuration of the second embodiment of a variable displacement vane pump (VOP) control system according to the present invention; and
- figure 6 shows the usual pattern of the engine demand curve (a) compared against the pattern of a gear pump-related curve (b*) for a system according to the present invention, and, respectively, against the pattern of a curve (c*) related to a variable displacement vane pump (VOP) for a system according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
In figure 2, number 100 indicates a gear pump belonging to a control system 200 object of the present invention.
In known way, the gear pump 100 conveys oil at a certain pressure P through a primary hydraulic circuit 101 towards an endothermic engine (not shown) for lubricating it.
As shown again in figure 2, from the primary circuit 101 departs a secondary circuit 102 provided with a shutter device 103.
Device 103 is provided with a chamber 104, which envisages an oil inlet 105 and an oil outlet 106 from the primary circuit 101. The oil released from output 106 is conveyed towards a first drain SCl. Within the chamber 104, there is a shutter 107 subjected to the elastic forces exerted by a spring 108.
The shutter 107 comprises, in turn, a piston 109 and a plunger 110 reciprocally connected by a stem 111.
The bottom of the chamber 104 is provided with a further outlet 112 from which departs a conduit 113 that leads to a second drain SC2. Furthermore, the conduit 113 is provided with a solenoid valve 114 which is closed in the configuration shown in figure 1.
The plunger 110 splits chamber 104 into a first portion 104a comprised between a lower surface 109a of piston 109 and an upper surface 110a of plunger 110, and a second portion 104b defined by a lower surface 110b of the piston 110 and a bottom 115 of chamber 104.
Both the first portion 104a and a second portion 104b (with solenoid valve 114 closed) (figure 2) are full of oil.
As explained above, at low rpm (figure 6) , solenoid valve 114 is closed and controlled by an electronic control unit (not shown) which takes rpm and temperature of the endothermic engine into account. In this way, the pressures on the surfaces 110a and 110b of the plunger 110 balance and the resulting pressure acts only on surface 109a of piston 109 (highlighted in bold) .
As shown in figure 6, when the endothermic engine rpm increases and reaches a value N*, with solenoid valve
114 closed, the pressure P* of the oil in the portion
104a of chamber 104 is such to apply a force on the surface 109a (highlighted in bold) which raises the shutter 107 in a direction and sense defined by an arrow Fl (figure 2) .
From this point on, despite the increase of rpm, pressure P* in the primary hydraulic circuit 101 remains the same because outlet 106 is not closed by shutter 107 and the oil existing in the portion 104a is conveyed towards the first drain SCl. Once reached the rpm N**, the electronic control unit (not shown) controls the opening of the solenoid valve 114 so that the system 200 assumes the configuration shown in figure 3.
If solenoid valve 114 is open (figure 3) , the working force of the oil existing in portion 104a which acts on the piston 109 is that generated by the pressure of the oil itself acting on portions 116 (highlighted in bold in figure 3) of surface 109a. Evidently, the other forces which act on the rest of the surface 109a will be balanced by those acting on surface 110a.
The shutter 107 will therefore be lowered in a direction and sense defined by an arrow F2 (figure 3) .
All this allows a slight leakage of oil through outlet 106 thus returning curve (b*) (figure 6) to a pattern equal to that of curve (b) shown in figure 1.
As shown in figure 6, by making the gear pump 100 work between two pressure values P* and P** the energy saving shown by area A3 is obtained, thus reaching the prearranged object. In other words, there is a change from area Al in figure 1 to an area Al* in figure 6.
Figures 4 and 5 show a second embodiment of the present invention in which a variable displacement vane pump 300 is used.
Pump 300 is integrated in a control system 400.
System 400 envisages, in a way entirely similar to that seen for the first embodiment shown in figures 2 and 3, a primary lubrication circuit 301 from which a secondary circuit 302 that leads to a drain SC3 departs.
In turn, the secondary circuit 302 envisages a solenoid valve 303 which is open in the configuration shown in figure 4 and therefore the secondary circuit 302 drains into drain SC3.
The adjustment system of the pump 300 by means of the primary circuit 301 will not be explained in greater detail because it is widely known in literature. In the configuration shown in figure 4 (with solenoid valve 303 open) , the secondary circuit 302 discharges oil into a chamber 304. In this way, when the rpm of the endothermic engine increases and reaches a value N* corresponding to a pressure p*, with solenoid valve 303 open, the pump displacement 300 is adjusted by the oil pressure existing in a chamber 305 and by the stiffness of a spring 306 which is found in chamber 304.
When the rpm exceeds a certain value N** (figure 6) , the solenoid valve 303, controlled by the electronic control unit, closes the secondary circuit 302, the chamber 304 is filled with oil which may be only discharged through the primary circuit 301 towards a shutter device 307. In this way, the displacement of the pump 300 is adjusted by the stiffness of a spring 308, which acts on a shutter 309, by the pressure of the oil in the chamber 304 and in chamber 305, as in variable displacement vane pumps of the traditional type.
Also in this case, an energy saving shown by area A3 in figure 6 is obtained. In other words, there is a shift from area A2 shown in figure 1 to an area A2* shown in figure 6.

Claims

1.- A control system (200; 400) for oil pumps comprising an oil pump (100; 300) and a primary lubrication circuit (101; 301); control system (200; 400) characterised in that a secondary circuit (102; 302) comprises a solenoid valve (114; 303) whose opening/closing is controlled by an electronic control unit; said secondary circuit (102; 302) making possible the adjustment between two values (P*, p**) of the delivery pressure in said primary lubrication circuit
(101; 301) to save pumping energy.
2.- A control system (200; 400) as claimed in claim 1, characterised in that said oil pump (100) is a gear pump (100) .
3.- A control system (200; 400) as claimed in claim 1, characterised in that said oil pump (300) is a variable displacement vane pump (300) .
4.- A control system (200,; 400) as claimed in any of the preceding claims, characterised in that said secondary circuit (102; 302) envisages a shutter device (103; 307) for adjusting the flow of pressurised oil.
5.- A control system (200) as claimed in claim 2 and in claim 4, characterised in that said shutter device (103) is hydraulically connected with said solenoid valve (114) .
EP06765438.4A 2005-06-01 2006-05-30 Oil pump control system Active EP1891307B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO20050383 ITBO20050383A1 (en) 2005-06-01 2005-06-01 OIL PUMP CONTROL SYSTEM
PCT/IB2006/001412 WO2006129169A1 (en) 2005-06-01 2006-05-30 Oil pump control system

Publications (2)

Publication Number Publication Date
EP1891307A1 true EP1891307A1 (en) 2008-02-27
EP1891307B1 EP1891307B1 (en) 2018-08-15

Family

ID=37023100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06765438.4A Active EP1891307B1 (en) 2005-06-01 2006-05-30 Oil pump control system

Country Status (3)

Country Link
EP (1) EP1891307B1 (en)
IT (1) ITBO20050383A1 (en)
WO (1) WO2006129169A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2066904B1 (en) 2006-09-26 2017-03-22 Magna Powertrain Inc. Control system and method for pump output pressure control
US8499738B2 (en) * 2010-03-01 2013-08-06 GM Global Technology Operations LLC Control systems for a variable capacity engine oil pump
JP5950583B2 (en) * 2011-03-27 2016-07-13 株式会社山田製作所 Pump device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62248812A (en) * 1986-04-22 1987-10-29 Nippon Soken Inc Oil circulation device
DE4319200C1 (en) * 1993-06-09 1994-07-21 Glyco Metall Werke Multi-stage controller for lubricant pumps with continuously variable delivery volumes
US5339776A (en) * 1993-08-30 1994-08-23 Chrysler Corporation Lubrication system with an oil bypass valve
JP3122348B2 (en) * 1995-09-26 2001-01-09 東京部品工業株式会社 Engine lubrication oil supply device
DE19915739A1 (en) * 1999-04-08 2000-10-12 Bayerische Motoren Werke Ag Variable-speed vane pump
US6488479B1 (en) * 2001-05-17 2002-12-03 Ford Global Technologies, Inc. Variable pressure oil pump
DE10239364A1 (en) * 2002-08-28 2004-03-18 Dr.Ing.H.C. F. Porsche Ag Device for controlling the pump output of a lubricant pump for an internal combustion engine
DE102004049029B4 (en) * 2004-10-08 2015-05-21 Audi Ag Apparatus and method for controlling a lubricating oil pressure of an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006129169A1 *

Also Published As

Publication number Publication date
ITBO20050383A1 (en) 2006-12-02
WO2006129169A8 (en) 2007-04-19
EP1891307B1 (en) 2018-08-15
WO2006129169A1 (en) 2006-12-07

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