US20150034027A1 - Hybrid electromechanical coolant pump - Google Patents
Hybrid electromechanical coolant pump Download PDFInfo
- Publication number
- US20150034027A1 US20150034027A1 US14/517,914 US201414517914A US2015034027A1 US 20150034027 A1 US20150034027 A1 US 20150034027A1 US 201414517914 A US201414517914 A US 201414517914A US 2015034027 A1 US2015034027 A1 US 2015034027A1
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- United States
- Prior art keywords
- coolant
- pump
- drive mechanism
- impeller
- coolant pump
- 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.)
- Abandoned
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Classifications
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- 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
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/162—Controlling of coolant flow the coolant being liquid by thermostatic control by cutting in and out of pumps
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- 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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
- F01P5/12—Pump-driving arrangements
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- 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
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- 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
- F01P2037/00—Controlling
Abstract
The invention relates to a coolant pump having an impeller which is arranged on a pump impeller shaft and having a drive device for the impeller, which drive device has a mechanical drive and an electric-motor drive. The impeller shaft is divided into a driving section and a driven section, and an openable and closable clutch is arranged between the driving section and the driven section. Operation of the coolant pump by either the mechanical drive or the electric-motor drive can be dependent upon a predetermined speed of threshold of rotation of the impeller, and/or upon a predetermined power usage threshold.
Description
- This is a continuation-in-part of U.S. patent application Ser. No. 12/937,746, filed on Feb. 6, 2011, and entitled “Coolant Pump.”
- The present invention relates to coolant pumps which have both a mechanical mode of operation and an electric mode of operation.
- A coolant pump is known from DE 102 14 637 A1. To be able to realize different driving operation states of a vehicle with such a coolant pump, which has both an electric-motor drive and also a mechanical drive, a planetary drive is provided which can be driven by the electric motor and/or by the mechanical drive. However, such a design is complex with regard to its mechanical construction and is susceptible to operation inconsistencies.
- It is therefore an object of the present invention to create a coolant pump with a simpler and more reliable design in relation to the prior art and whose operation is efficient and fail-safe.
- In accordance with a preferred embodiment, the pump wheel shaft is divided into a driving section and a driven section which is separate from said driving section. A clutch is arranged between the driving section and the driven section and can be opened in order to separate said two sections and which can be closed in order to connect the two sections. With this embodiment, the pump wheel can be driven both by an electric-motor drive and also by a mechanical drive, in each case independently.
- With the present invention, pumps are provided, such that the mechanical pump takes over the function of the electric pump in order to boost the pump power for operating conditions for which the electric pump would be inefficient or inadequate. It is also possible to obtain a fail-safe function for the electric pump, since it can be coupled to the mechanical pump if an interruption occurs in the electrical energy supply.
- One of the features of the invention is that the operation of a heavy truck engine using a fully variable coolant pump showed that there is a need for two different flow volumes of coolant fluid. A smaller volume or amount of coolant flow (i.e. “base flow”) is needed to, for example, avoid hot spots in the engine. A higher volume or amount of coolant flow (i.e. “peak flow”) is needed to, for example, cool the vehicle in full load conditions.
- In principle, the following implementations of the invention are possible:
- (A) Although it is possible to operate both pump types in parallel, it is particularly preferably provided according to the invention that the electric pump and the mechanical pump be connected in series, with a regulated clutch performing the function of coupling in the mechanical pump, for example, on the basis of pressure measurements or monitoring of the electrical energy supply.
- (B) In the case of a sequential arrangement of the mechanically operated pump and the electrically operated pump, it is preferable, for both pumps to use a single pump wheel.
- (C) It is also possible according to the invention, as a result of a downsizing of the coolant pump, for said coolant pump to be adapted both for the utility vehicle field and also for the passenger vehicle field. In the case of the passenger vehicle field, the warm-up behaviour of the engine can be improved by precise adjustment of the basic coolant flow.
- (D) In hybrid vehicles, the invention may also provide a coolant flow when the engine is stopped. The coolant flow is required for the functioning of the alternator/generator and for the battery. The coolant flow which is required may accordingly be provided by the combination according to the present invention of the electric pump and of the mechanically driven pump, without an auxiliary pump being required, as in the prior art.
- The invention has numerous benefits and advantages:
- (1) A fail-safe design of the entire system, since it is possible, when the electric-motor drive is deactivated, for the pump wheel to be actuated solely by the mechanical drive. The decoupling from the mechanical drive takes place by means of an actuation of the clutch. In the rest position of the clutch, the pump wheel shaft is driven by the mechanical drive. In this situation, the clutch could be held in a deactivated state by an electrical mechanism. In the event of an electrical failure, the clutch will automatically connect the mechanical drive to the pump wheel.
- (2) Two operating principles for actuating a driving side, wherein the two driving sides can be decoupled entirely from the driven side, or the two driving sides can be decoupled only individually from the driven side.
- (3) In-line concept for coupling/decoupling with electric-motor drive. The electric-motor drive, which is preferably designed as a brushless direct-current (“DC”) motor, is arranged on the driven side of the pump wheel shaft. The mechanical drive and also the electric-motor drive may, connected by the clutch, be arranged in alignment on the same axis of the coolant pump, and drive only a single pump wheel. This is a preferred embodiment.
- (4) The concept of the coolant pump according to the invention is compatible with different coolant pump designs.
- (5) If the coolant pump is for an internal combustion engine of a passenger vehicle, the coolant pump according to the invention can provide hydraulic energy when the internal combustion engine is at a standstill. Post-operation cooling can take place by the main pump wheel by operation of the electric motor.
- (6) Sequential operating logic can be obtained with the coolant pump according to the invention, since the pump wheel can be driven either by the electric motor or by the mechanical drive.
- (7) The bearings on the driving side and on the driven side can be arranged in alignment on the same axle.
- (8) It is possible to recover electrical energy from the electric-motor drive (generator operation) when the pump wheel is being driven exclusively by the mechanical drive. From an energy aspect, this is particularly possible in the overrun mode of the internal combustion engine.
- (9) The provision of sufficient cooling power for most operating states by decoupling the mechanical drive and operation by means of the electric motor.
- (10) As a result of the cubic power characteristic curve of a coolant pump, the electric motor provides a basic volume flow. The maximum delivery power for maximum cooling power takes place by coupling the mechanical drive (without electric-motor pump).
- Further details, advantages and features of the present invention can be gathered from the following description of an exemplary embodiment on the basis of the drawing, in which:
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FIG. 1 shows a sectioned illustration through an embodiment of a coolant pump according to the invention; -
FIG. 2 shows a schematic construction of a cooling circuit of an internal combustion engine having the coolant pump according to the invention; -
FIGS. 3 and 4 show two statistical distribution plots of the pump wheel rotational speed in relation to the engine speed for two transient driving cycles; -
FIG. 5 depicts the power consumption for an embodiment of a coolant pump according to the invention; -
FIGS. 6 and 7 show a coolant flow scenario and power consumption, respectfully, for an embodiment of a coolant pump according to the invention; -
FIG. 8 is a cross-sectional view of an embodiment of a coolant pump according to the invention; and -
FIG. 9 is a schematic illustration of a cooling circuit of an internal combustion engine utilizing an embodiment of the coolant pump according to the invention. -
FIG. 1 shows a sectioned illustration through acoolant pump 15 according to one embodiment of the invention. Thecoolant pump 15 has a pump wheel (also called an “impeller”) which is arranged on a pump wheel shaft (also called an “impeller shaft”). The pump wheel shaft is divided into adriving section 3 and a drivensection 11. In the illustrated embodiment, thedriving section 3 is formed as a flange-shape structure to which amechanical drive 1, in the form of a belt pulley in this example, is rotationally fixedly connected. In the illustrated embodiment, the arrangement composed of a flange-shape structure 3 and abelt pulley 1 is mounted in a housing 7 by means of abearing 6. - The
mechanical drive 1 may be connected to an internal combustion engine of a motor vehicle, wherein in the illustrated embodiment, it is possible to use a belt drive. Only thebelt pulley 1 is shown in order to simplify the illustration. - The driven
section 11 of the pump wheel (impeller) shaft is mounted in the housing 7 by means of twobearings free end 16, supports thepump wheel 13. Here, thefree end 16 of the drivensection 11 is sealed off with respect to the housing 7 by means of aseal 12 which is arranged between thepump wheel 13 and thebearing 10. - As is also shown in
FIG. 1 , the drivensection 11 and thedriving section 3 of the pump wheel shaft can be connected by means of a clutch 4 which is arranged between the twosections coil 5. - An electric-motor drive is positioned in the driven
section 11 of the pump wheel shaft, which electric-motor drive is arranged, with itsrotor 9 and astator 8 which surrounds saidrotor 9, in axial alignment with themechanical drive 3 on the drivensection 11. Here, as shown inFIG. 1 , therotor 9 and thestator 8 are positioned in the housing 7. - An optional
Hall effect device 14 can be arranged between therotor 9 and thebearing 6. - With this design of the
coolant pump 15 according to the invention, it is possible for thepump wheel 13 to be completely separated from themechanical drive 1 by opening theclutch 4. Here, the electric-motor drive, which is preferably embodied as a brushless DC motor, is arranged on the side of the drivensection 11 of the pump wheel shaft. This allows the electric motor drive to provide a regulable coolant flow in a predeterminable power range, which is independent of the rotational speed of the motor to which thecoolant pump 15 is connected, when the drivensection 11 is separated from thedriving section 3 by the openedclutch 4. - For this purpose, the
rotor 9 of the electric-motor drive is arranged directly on the drivensection 11 of the pump wheel shaft, as can be seen fromFIG. 1 . Thestator 8 is integrated, around the same axis of the housing 7, in the housing 7 around therotor 9, as can likewise be seen fromFIG. 1 . - The electric-
motor drive FIG. 1 ). If the drivenside 11 is separated from the drivingside 3, thepump wheel 13 can be driven solely by the electric-motor drive. Here, it is provided that sufficient hydraulic output power is provided in order to provide the required coolant flow or all normal operating conditions of the engine which is connected to thecoolant pump 15. To obtain a maximum available coolant flow, the drivensection 11 can be connected to thedriving section 3 of the pump wheel shaft by means of theclutch 4. In this case, thepump wheel 13 is driven solely by themechanical drive 1 when the electric motor is deactivated. -
FIG. 2 illustrates a schematic construction of a possible cooling circuit of aninternal combustion engine 17 which uses thecoolant pump 15 according to the invention. In this schematically highly simplified illustration, the pump which is driven by an electric motor is denoted by thereference symbol 20 and the mechanically driven pump is denoted by thereference symbol 21. The two pumps, which are arranged in series, may be connected via theclutch 4 to abelt drive 2 and via thebelt pulley 1 to theengine 17 for the provision of the required mechanical drive energy. In the illustrated embodiment, the coolant circuit also has athermostat 18 and acooler member 19, such as a radiator, the interaction of which is shown by the arrows. - The coolant pump can be arranged in a sequential or parallel manner, wherein the electrical pump can be arranged in series or in parallel to the mechanical driven member. This includes serial/parallel operation in both mechanical and hydraulic manner (drive side or pump side).
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FIGS. 3 and 4 show data of two transient driving cycles evaluated with a fully variable pump, with the curves and entries plotted therein. Thegraphs base flow peak flow - In the
occurrence plot 50, thebase flow 52 could be provided by the electrical pump drive at less than one kW power. Thepeak flow 54 could be provided by the mechanical pump drive at more than one kW power in the illustrated example. -
FIG. 5 illustrates the power considerations of the two major modes for a variable coolant pump. Thetop graph 70 plots the power consumption of the coolant pump, showing the volume flow in liters per minute (1/min) versus the power (in kW). Thearea 72 is the preferred area for use of an electrical pump, and thearea 74 is the preferred area for use of a mechanically driven pump. The borderline for determining the choice of pump and drive type is shown at 76. The borderline is one kW in the illustrated example. - The
bottom graph 80 is the same asoccurrence plot 60 inFIG. 4 , and is the basis for thegraph 70 andpreferred areas borderline 76. On the basis ofgraph 80, the borderline for determining whether to use mechanical drive or electric drive in this example is at about 1500 rpm of the impeller. - The power considerations shown in
FIGS. 3-5 depict the two major modes for a variable coolant pump. The base flow provided by the pump can be delivered by a pump driven by an electric motor, since the power consumption is below one kW. The power consumption above one kW is difficult to be achieved by an electric motor, mainly due to the lack of electrical power in common vehicles today. Here, a mechanically driven system is preferred. The mechanical drive provides a “boost” when more cooling is needed. - The discussed embodiment above also provides a “failsafe” coolant pump. If the electrical system or power in the vehicle were to fail or stop in some manner, the mechanical drive would take over and the coolant pump would be driven by the pulley and mechanical drive. This would allow the operator of the vehicle to continue to operate the vehicle until the electrical system failure could be repaired and reactivated.
- In addition, the discussed embodiment can continue to deliver coolant through the system even when the engine is switched or turned off. The electrical drive powered by the battery of the vehicle can continue to operate the coolant pump and circulate the cooling fluid until the engine and other components are sufficiently cooled. Some vehicles today require use of an auxiliary pump to accomplish this.
- Significant benefits and advantages of the invention include the following:
- (i) Hydraulically parallel or sequential running electric and mechanical pumps with a controlled clutch on the mechanical member driven by the backpressure or electrical power of the electric pump system (the clutch is controlled by the electrical power supply of the electric pump system or by the back pressure of the coolant circuit);
- (ii) Mechanically sequential running mechanical and electrical drive sharing one hydraulic member (i.e. impeller).
- Beside these features, the inventive coolant pump can be downsized to the needs for the automotive market segment, where it could improve the warm-up behavior of the vehicle and engine by exactly applying the needed base flow with the speed of the electric motor.
- In accordance with embodiments of the invention, the coolant pump drive can be completely decoupled from the FEAD drive side by the clutch, such as an electromagnetic clutch. The DC motor is integrated in the driven shaft axle to provide a controllable coolant flow in a defined performance range completely independent from the engine speed when the driven axle is decoupled from the drive shaft. For this, the rotor of the DC motor is directly mounted on the driven shaft, and is positioned between two bearings above and beneath the rotor. The stator is mounted in the coolant pump housing on the same axis.
- The DC motor, which preferably is brushless, is controlled by a commutated signal from an electronic control device. If the driven side is decoupled from the drive side, the impeller can be driven by the DC motor. This will provide sufficient hydraulic power to meet the required coolant flow for most of the operating conditions of a vehicle. To achieve the maximum available coolant flow, the driven side is coupled with the drive side, for example, with an electromagnetic clutch. The impeller will then be driven by the FEAD.
- As indicated, benefits and features of the embodiments of the invention include:
-
- Failsafe function of the system, due to jointly supplied voltage. The clutch will engage to drive the impeller by the pulley, if the brushless DC motor is powered off
- Inline concept of On/Off clutch with electronic motor. The DC motor is mounted on the driven side. Both devices, clutch and DC motor, are aligned on the same axis and are driving just one impeller.
- Hydraulic power can be provided at engine stop conditions.
- Sequential operational logic where the impeller can be driven simply by one device (electronic motor or by pulley).
- Bearing of drive side and driven side are aligned on the same axis.
- Possible electric energy recovery from the brushless DC motor, if the impeller is driven by the pulley.
-
FIGS. 6 and 7 are two additional graphs which illustrate the operations and benefits of embodiments of the present invention.FIG. 6 depicts the coolant flow verses engine speed, whileFIG. 7 depicts the power consumption verses engine speed. - In
FIG. 6 , which is designated generally by thereference numeral 100, theline 102 depicts the engagement of the electromagnetic clutch.Line 104 depicts the amount of 20% of the coolant flow. This amount is controlled by the electric DC motor, particularly a brushless DC motor, and also is the maximum amount of flow that the electric motor can produce. Disengagement of the clutch is represented by theline 106. - With an electric DC motor, only about 5% of the total power is needed to provide about 20% of the coolant flow.
- In
FIG. 7 , which is designated by thereference numeral 120, theline 122 depicts the power consumption when the electromagnetic clutch is engaged.Line 124 depicts the maximum power consumption by the DC motor, which is preferably brushless. -
FIG. 8 depicts anembodiment 150 of a dual mode coolant pump in accordance with the invention. The pump includes afirst body member 152 which is fixedly connected to apulley member 154. Thebody member 152 is rotated at input speed by a belt member (not shown) attached to the vehicle engine. This provides the mechanical drive member for rotation of thecoolant impeller 156. -
Bearing member 158 allows the mechanicaldrive body member 152 to rotate freely when it is not needed to drive (rotate) theimpeller member 156 and provide additional coolant flow to assist in cooling the engine. - The mechanical drive body member is situated inside a
housing member 160. When thecoolant pump 150 is in use, thehousing member 160 is attached to the vehicle engine or another component or housing which in turn is attached to the engine and in fluid communication with the engine coolant system. -
Impeller shaft member 162 is positioned centrally inside thehousing 160. Theshaft member 162 is fixedly secured at one end 162-A to theimpeller member 156. The other end of the shaft member 162-B is secured to an openable and closeableclutch mechanism 170. Theclutch mechanism 170 is preferably an electromagnetic clutch mechanism and is operated byelectric coil 180. - The
impeller shaft member 162 is rotatably positioned inside thehousing 160 by a pair of bearingmembers electric motor 190, which preferably is a brushless DC motor, is positioned in the housing and situated between the two bearingmembers motor 190 includes astator member 192 and arotor member 194. Therotor member 194 is fixedly secured to theimpeller shaft member 162 and rotates with it. - A sealing
member 196 is used to isolate the coolant fluid (in which theimpeller 156 is positioned) from the components of thecoolant pump 150. In addition, an optional Hall Effect Device (HED) 198 is positioned in the housing adjacent the rotor member in order to monitor the speed of rotation of the impeller shaft and provide data to a computer control system, such as, for example, an electronic control unit (ECU). The data generated and supplied by the HED as well as other possible data supplied by other sensors, generally controls the operation of the coolant pump. - The
cooling pump 150 is a dual mode coolant pump for operating and controlling the operation of the rotation of the impeller and thus the flow of coolant in the engine and/or vehicle cooling system. Under normal conditions, the impeller is operated by theelectric motor 190. Under these conditions, the electromagneticclutch mechanism 170 is held in an open condition by power from thecoil member 180. When more cooling is needed, or in a failsafe situation where electric power is lost to the coolant pump, theclutch mechanism 170 closes and theshaft member 162 is rotated by themechanical drive member 152. - As indicated in the description of
FIG. 8 , thefirst body member 152 comprises the mechanical drive mechanism for the coolant pump, while theelectric motor 190 comprises the driven drive mechanism for the coolant pump. -
FIG. 9 schematically depicts acooling system 200 for a vehicle engine, as well as acontrol system 230 for the cooling system. The cooling system includes avehicle engine 202, athermostat 204, aheat exchanger 206, such a as a radiator, and a dualmode coolant pump 208. Thecoolant pump 208 includes apulley member 210, amechanical drive mechanism 212, aclutch mechanism 214, and a DCelectric motor 216. - The
coolant pump 208 could be, for example, thecoolant pump 150 discussed above and shown inFIG. 8 . - The
pulley member 210 is driven by abelt 220 from apulley member 222 attached to and rotated by thevehicle engine 202. Engine coolant flows from theengine 202 through theradiator 206 and then through thecoolant pump 208 before being directed back to the engine. - The
control system 230 includes an electronic control unit (ECU) 232 which controls the operation of thecoolant pump 208. The ECU receives data from various sensors, such as one ormore temperature sensors 234, which assist in directing the operation of the cooling system. Also,control logic 240 in thecoolant pump 208 can be supplied to operate the various coolant pump components and mechanisms. TheECU 232 can also be in communication and receive data from one or more other ECUs in the engine and vehicle. - With the present invention, the coolant pump drive can be completely decoupled from the FEAD drive side by, for example, an electromagnetic clutch. A brushless DC motor integrated with the driven shaft member to provide a controllable coolant flow in a defined performance range independent from the engine speed. For this, the rotor of the brushless DC motor is directly mounted on the driven shaft member with roller bearings positioned above and beneath the rotor. The stator is mounted in the coolant pump housing on the same axis.
- The brushless DC motor is controlled by a commutated signal from an electronic control unit. If the driven side is decoupled from the drive side, the impeller is driven by the brushless DC motor. It is designed to provide sufficient hydraulic power to meet the required coolant flow for the most of the operating conditions of a vehicle. To achieve the maximum available coolant flow, the driven side is coupled with the drive side, by, for example, an electromagnetic clutch. The impeller will then be driven by the FEAD.
- The present invention provides at least the following:
-
- A failsafe system, due to jointly supply voltage. The clutch will engage to drive the impeller by the pulley, if the brushless DC motor will be powered off
- Inline Concept of On/Off clutch with electronic motor. The brushless DC motor is mounted on the driven side. Both devices, clutch and brushless DC motor, are aligned on the same axis and are both positioned operably to drive the same impeller.
- Hydraulic power can be provided at engine stop condition.
- Sequential operation logic in which the impeller can be driven just by one device (electronic motor or by pulley).
- Bearings on the drive side and the driven side are aligned on the same axis.
- Electric energy recovery from the brushless DC motor when the impeller is driven by the pulley.
- While preferred embodiments of the present invention have been shown and described herein, numerous variations and alternative embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention is not limited to the preferred embodiments described herein but instead limited to the terms of the appended claims.
Claims (31)
1. A method for operating a cooling system for an internal combustion engine, the engine having a supply of a coolant liquid and an impeller on an impeller shaft for circulating the coolant liquid in the engine, the method comprising the steps of:
providing a coolant pump for rotating the impeller, said coolant pump having both a mechanical drive mechanism and an electrical drive mechanism;
rotating the impeller shaft by said electrical drive mechanism when the speed of the impeller is below a predefined speed threshold; and
rotating the impeller shaft by said mechanical drive mechanism when the speed of the impeller is above the predefined speed threshold.
2. The method as described in claim 1 wherein said predefined threshold is about 1500 rpm.
3. The method as described in claim 1 wherein the impeller is rotated by said electrical drive mechanism when the power used by the impeller is less than a predefined power threshold.
4. The method as described in claim 3 wherein said predetermined power threshold is about 1 kW.
5. The method as described in claim 1 wherein the impeller is rotated by said mechanical drive mechanism when the power used by the impeller is above a predefined power threshold.
6. The method as described in claim 5 wherein said predetermined power threshold is about 1 kw.
7. The method as described in claim 1 wherein said electrical drive mechanism comprises an electric motor.
8. The method as described in claim 7 wherein said electric motor is a brushless DC motor.
9. The method as described in claim 1 wherein said electric drive mechanism and said mechanical drive mechanism are each operably connected to said impeller shaft.
10. The method as described in claim 9 further comprising the steps of:
providing a clutch mechanism between said electrical drive mechanism and said mechanical drive mechanism; and
operating said clutch mechanism to decouple said mechanical drive mechanism from said impeller shaft when the speed of the impeller is less than a predefined speed threshold.
11. The method as described in claim 10 wherein said predefined speed threshold is about 1500 rpm.
12. The method as described in claim 9 further comprising:
providing a clutch mechanism between said electrical drive mechanism and said mechanical drive mechanism; and
operating said clutch mechanism to couple said mechanical drive mechanism to said impeller shaft when the speed of the impeller is above a predefined speed threshold.
13. The method as described in claim 11 wherein said predefined speed threshold is about 1500 rpm.
14. The method as described in claim 1 further comprising the step of:
rotating said impeller shaft by said mechanical drive mechanism at any speed of the engine if there is an electrical failure preventing said electrical drive mechanism from operating.
15. The method as described in claim 9 further comprising the step of providing an electromechanical clutch mechanism positioned between said electrical drive mechanism and said mechanical drive mechanism.
16. The method as described in claim 9 further comprising the step of providing a hydraulically operated clutch mechanism positioned between said electrical drive mechanism and said mechanical drive mechanism.
17. The method as described in claim 16 wherein said hydraulically operated clutch mechanism is driven by back pressure from the coolant circuit.
18. The method as described in claim 16 wherein said hydraulically operated clutch mechanism is driven by electrical power from the electrical drive mechanism.
19. The method as described in claim 16 further comprising the step of providing a valve and recirculating system for operation of said hydraulically operated clutch mechanism.
20. A cooling system for an internal combustion engine, comprising:
an internal combustion engine, said engine comprising fluid for cooling said engine;
a temperature sensor for determining the temperature of said coolant fluid;
a cooler member for dissipating heat from said coolant fluid and reducing the temperature of said coolant fluid;
a coolant pump assembly for circulating said coolant fluid through said internal combustion engine and said cooler member whenever base flow and peak flow are needed;
a control system for operating said coolant pump assembly based on data provided by said temperature system;
said coolant pump comprising a mechanically driven pump mechanism and an electrically driven pump mechanism arranged in series;
said coolant pump further comprising a clutch mechanism; and
said mechanically driven pump mechanism being connected by said clutch mechanism in a pulley member which is connected in turn by a belt member to said internal combustion engine and driven at input speed;
wherein said coolant pump is operated by said electrically driven pump mechanism whenever base flow is needed; and
wherein said coolant pump is operated by said mechanically driven pump mechanism only when peak coolant flow is needed.
21. The cooling system as described in claim 20 wherein said cooler comprises a radiator mechanism.
22. The cooling system as described in claim 20 wherein said electrically driven pump mechanism comprises a brushless DC electric motor.
23. The cooling system as described in claim 20 further comprising a plurality of temperature sensors for providing data to said control system.
24. The cooling system as described in claim 20 wherein said control system comprises an electronic control unit.
25. The cooling system as described in claim 20 wherein said coolant pump is operated by said electrically driven pump mechanism when the volume of coolant flow is below about 150 liters/min.
26. The cooling system as described in claim 20 wherein said coolant pump is operated by said mechanically driven pump mechanism when the volume of coolant flow is about 400-450 liters/min.
27. The cooling system as described in claim 20 wherein said coolant pump is operated by said electrically driven pump mechanism when the power consumption is below about 1 kW.
28. The cooling system as described in claim 20 wherein said coolant pump is operated by said mechanically driven pump mechanism when the power consumption is above about 1 kW.
29. The cooling system as described in claim 20 wherein said coolant pump is driven by said electrically driven pump mechanism when the temperature of the coolant pump is below about 90° C.
30. The cooling system as described in claim 20 wherein said coolant pump is driven by said mechanically driven pump mechanism when the temperature of the coolant pump is below about 94° C.
31. The cooling system as described in claim 20 wherein said coolant pump is driven by either said electrically driven pump mechanism or said mechanically driven pump mechanism when the temperature of the coolant is in the range of about 90° C. to 94° C.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/517,914 US20150034027A1 (en) | 2011-02-06 | 2014-10-19 | Hybrid electromechanical coolant pump |
DE102015220324.7A DE102015220324A1 (en) | 2014-10-19 | 2015-10-19 | Electromechanical hybrid coolant pump |
CN201510679371.1A CN105526177A (en) | 2014-10-19 | 2015-10-19 | Hybrid electromechanical coolant pump |
US15/437,610 US20170211461A1 (en) | 2008-04-17 | 2017-02-21 | Hybrid electromechanical coolant pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US93774611A | 2011-02-06 | 2011-02-06 | |
US14/517,914 US20150034027A1 (en) | 2011-02-06 | 2014-10-19 | Hybrid electromechanical coolant pump |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/039112 Continuation-In-Part WO2009129050A2 (en) | 2008-04-17 | 2009-04-01 | Coolant pump |
US12/937,746 Continuation-In-Part US20110123365A1 (en) | 2008-04-17 | 2009-04-01 | Coolant pump |
US93774611A Continuation-In-Part | 2008-04-17 | 2011-02-06 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/437,610 Continuation US20170211461A1 (en) | 2008-04-17 | 2017-02-21 | Hybrid electromechanical coolant pump |
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US20150034027A1 true US20150034027A1 (en) | 2015-02-05 |
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Family Applications (2)
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US14/517,914 Abandoned US20150034027A1 (en) | 2008-04-17 | 2014-10-19 | Hybrid electromechanical coolant pump |
US15/437,610 Abandoned US20170211461A1 (en) | 2008-04-17 | 2017-02-21 | Hybrid electromechanical coolant pump |
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US15/437,610 Abandoned US20170211461A1 (en) | 2008-04-17 | 2017-02-21 | Hybrid electromechanical coolant pump |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9523393B2 (en) | 2011-04-13 | 2016-12-20 | Borgwarner Inc. | Multi-mode cooling pump |
CN106523122A (en) * | 2015-09-15 | 2017-03-22 | 博格华纳公司 | Method for operating a functional element |
US10340769B2 (en) | 2015-09-15 | 2019-07-02 | Borgwarner Inc. | Auxiliary drive device |
IT201800009201A1 (en) * | 2018-10-05 | 2020-04-05 | Ind Saleri Italo Spa | PUMP GROUP |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11280249B2 (en) | 2017-08-07 | 2022-03-22 | Hanon Systems EFP Canada Ltd. | Hybrid coolant pump |
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US6640562B2 (en) * | 2001-01-09 | 2003-11-04 | Kabushiki Kaisha Toyota Jidoshokki | Air-conditioning system for vehicle and its control method |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9523393B2 (en) | 2011-04-13 | 2016-12-20 | Borgwarner Inc. | Multi-mode cooling pump |
CN106523122A (en) * | 2015-09-15 | 2017-03-22 | 博格华纳公司 | Method for operating a functional element |
US10340769B2 (en) | 2015-09-15 | 2019-07-02 | Borgwarner Inc. | Auxiliary drive device |
IT201800009201A1 (en) * | 2018-10-05 | 2020-04-05 | Ind Saleri Italo Spa | PUMP GROUP |
WO2020070562A1 (en) * | 2018-10-05 | 2020-04-09 | Industrie Saleri Italo S.P.A. | Pump group |
CN112840131A (en) * | 2018-10-05 | 2021-05-25 | 萨乐锐伊塔洛工业有限公司 | Pump unit |
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US20170211461A1 (en) | 2017-07-27 |
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