WO2010106560A1 - Starting and electricity generating system for a reciprocating engine - Google Patents

Starting and electricity generating system for a reciprocating engine Download PDF

Info

Publication number
WO2010106560A1
WO2010106560A1 PCT/IT2009/000105 IT2009000105W WO2010106560A1 WO 2010106560 A1 WO2010106560 A1 WO 2010106560A1 IT 2009000105 W IT2009000105 W IT 2009000105W WO 2010106560 A1 WO2010106560 A1 WO 2010106560A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
engine
flywheel
piston
starting
Prior art date
Application number
PCT/IT2009/000105
Other languages
French (fr)
Inventor
Vincenzo Anastasio
Antonio Sbuttoni
Original Assignee
Alenia Aeronautica 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 Alenia Aeronautica S.P.A. filed Critical Alenia Aeronautica S.P.A.
Priority to PCT/IT2009/000105 priority Critical patent/WO2010106560A1/en
Publication of WO2010106560A1 publication Critical patent/WO2010106560A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00Starting of engines by means of electric motors
    • F02N11/04Starting of engines by means of electric motors the motors being associated with current generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18Structural association of electric generators with mechanical driving motors, e.g. turbine
    • H02K7/1807Rotary generators
    • H02K7/1815Rotary generators structurally associated with reciprocating piston engines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/006Structural association of a motor or generator with the drive train of a motor vehicle

Abstract

A starting and electricity generating system for a reciprocating engine in which at least one piston (2) is movable in opposite directions in a respective combustion chamber (4) to rotate a driving shaft (9) coupled to a flywheel adapted to dynamically absorb a part of the driving torque generated during the active working phases of the piston in order to return it during the phases in which the piston absorbs work. The flywheel consists of a rotor (20) of an electric, reversible axial flow machine (21) which has a stator (24) carried by the engine (1).

Description

STARTING AND ELECTRICITY GENERATING SYSTEM FOR A RECIPROCATING ENGINE

TECHNICAL FIELD The present invention relates to a starting and electricity generating system for a reciprocating engine .

BACKGROUND ART

As known, a starting system is usually used for starting reciprocating combustion engines, in which an electric starter causes the flywheel and the driving shaft connected thereto to rotate for a few seconds .

In many technical applications the flywheel (made with relatively large diameters) has a ring gear on its periphery which meshes (only at the start-up) with a pinion fitted on the output shaft of the electric starter.

The reciprocating engine is also used to rotationally feed an electric generator, in turn used to meet the power supply needs' of the vehicles in which the reciprocating engine is installed. DISCLOSURE OF INVENTION

It is the object of the present invention to implement a starting and electricity generating system in which the electric starter, the electric generator of the vehicle and the flywheel are integrated in a single unit, thus simplifying the structure of the engine itself, improving reliability thereof and reducing its costs .

The aforesaid object is achieved by the present invention as it relates to a starting and electricity- generating system for a reciprocating engine in which at least one piston is movable in opposite directions within a respective combustion chamber to rotate a driving shaft coupled to a flywheel adapted to dynamically absorb a part of the driving torque generated during the active working phases of the piston in order to return it during the phases in which the piston absorbs work, characterized in that the flywheel consists of a rotor of an electric, reversible axial flow machine which has a stator carried by the engine.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be disclosed with reference to the accompanying drawings which show a non-limitative embodiment thereof, in which: figure 1 shows a starting and electricity generating system made according to the dictates of the present invention and applied to a reciprocating engine; figure 2 shows a wiring diagram of the starter/generator in figure 1; figure 3 shows a first detail of the starter/generator in figure 1; and - ' figure 4 shows a second detail of the starter/generator in figure 1.

BEST MODE FOR CARRYING OUT THE INVENTION

In figure 1, numeral 1 indicates as a whole a reciprocating engine provided with a starting and electricity generating system made according to the present invention.

The reciprocating engine 1 is provided with a plurality of pistons 2 (four in the example shown) which are linearly movable in a reciprocating direction along respective cylindrical combustion chambers 4 made in an engine body 5.

Pistons 2 are connected by means of a rod-crank system 7 to a driving shaft 9 (also named crankshaft) which generates a power output of the engine 1.

Engine 1 is further provided with a feeding/exhaust system in which a plurality of valves 12a, 12b actuated by a camshaft 13, fed by the driving shaft 9, supply the combustible gas mixture to the combustion chambers 4 and exhaust the exhausted gases in an already known manner.

Engine 1 is further provided with a lubrication system (already known) , in which lubricant oil flows into pipes (not shown) of the engine 1 thus lubricating movable parts of the engine itself and is collected in an oil sump 14 carried by a crankcase of the engine body 5.

The above-disclosed structure of engine 1 is absolutely standard and therefore will not be described in further detail. The embodiment relates to a four- stroke engine (an Otto cycle engine or a Diesel engine) , but the invention is also applied to other engines, e.g. two-stroke engines (not shown) with or without feeding valves .

As known, reciprocating engines are characterized by continuous oscillations of the produced driving torque due to the nature of the mechanical power generating process which includes a sequence of operating states, or phases, in which piston 2 alternatively serves a predominantly driving function

(phase of expanding the gases in the combustion chamber

4) and then a braking function (phase of compressing the combustible mixture) .

Furthermore, the piston 2 and the rod-crank system 7 connected thereto undergo continuous linear speed variations, moving between two stop states (top dead center and bottom dead center) at which the speed changes direction; such sudden speed variations result in further oscillations of the driving torque available at driving shaft 9.

In order to reduce the oscillations of the torque present on the driving shaft, all known reciprocating engines are provided with a flywheel directly mounted to the driving shaft 9 and adapted to dynamically absorb a part of the driving torque generated in the active working phases of the piston in order to return it during the phases in which the piston absorbs work instead.

According to the present invention, the flywheel consists of a rotor 20 of an electric, reversible axial flow machine 21 (of known type) , which has a stator 24 carried by the body of the engine 1. As it will be explained below, the electric reversible axial flow machine 21 may work both as motor and as current generator . In greater detail, rotor 20 comprises at least two plates 26a and 26b made of non-magnetic metal material, of suitable weight and size adapted to achieve the required moment of inertia for the smooth operation of the reciprocating engine, which carry a plurality of permanent magnets 27 angularly spaced from one another and facing the stator 24 on a peripheral annular portion thereof facing the stator. The permanent magnets 27 typically have a flat trapezoidal shape and are arranged in groups (figure 3); the angular spacing between the magnets within the groups being smaller than the angular reciprocal spacing between the groups . Such an arrangement of the permanent magnets 27 contributes to decreasing cogging phenomena which may occur during the rotating step of the electric, axial flow machine 21. In the embodiment shown, the flywheel comprises a first plate 26a and a second plate 26b, which are coaxial, axially spaced from each other and carry first and second reciprocally facing permanent magnets 27a, 27b. ' Stator 24 (figure 2) comprises a plurality of stator windings 28 which extend, at least in part, into the gap existing between the first and second plates 26a, 26b, the first and second magnets 27a, 27b being arranged on opposite sides with respect to the stator windings 28.

The first and second plates 26a, 26b are

' mechanically carried by a short . cylindrical sleeve 30 which is coaxial to the plates 2βa, 26b and provided, at a first end, with an annular flange 32 firmly connected to one end of the driving shaft 9. A second end of the cylindrical sleeve 30 outputs the torque produced by the engine 1, e.g. the second end is connected to the inlet of a transmission (not shown) .

The stator 24 (figure 4) comprises a toroidal core 24 made of magnetic material which carries a plurality of turns 35 equally spaced from one another along the whole circumference of the toroidal core 34. In greater detail, the toroidal core 34 has a substantially rectangular cross-section and is formed by a plurality of metal foils reciprocally sandwiched according to known techniques in order to reduce eddy currents . ' Each turn 35 has a rectangular peripheral section with curved sides and consists of a metal conductor

(usually a copper strap coated with a layer of insulating paint, not shown) wound about the core 34.

Turns 35 are further connected to one another in order to form first, second and third stator windings 28a, 28b and 28c (figure 2) of the electric machine 21, of three- phase type.

Two reciprocally facing turns 35 (figure 4) and an external wall of the core 4 delimit an approximately- parallelepiped-shaped space; such a space accommodates a trapezoidal-section, metal tooth 37, which is arranged between two facing turns 35. A cylindrical tubular wall 42 defines a cavity which accommodates stator 24, turns 35 and teeth 37. The turns 35 are arranged with a shorter side parallel and adjacent to the cylindrical tubular wall 42 and with the teeth 37 facing the tubular cylindrical wall 24. A hardened resin ensures the firm connection of the toroidal core 34, turns 35 and teeth 37 to the tubular cylindrical wall 42.

The cylindrical tubular wall 42 is connected to the crankcase of the engine 1 through a flange 50 (figure 1) .

In use, to start the engine 1, a three-phase power voltage controlled in width and frequency is supplied to the windings 28a, 28b and 28c of stator 24 so as to create a rotating magnetic field which causes the plates 2βa, 2βb and driving shaft 9 to rotate.

Such three-phase voltage is provided (figure 2) by a DC-AC converter 60 adapted to choke a direct voltage supplied by a battery.

The electric axial flow machine 21 thus acts as starter of the reciprocating engine 1.

Two components existing in traditional reciprocating engines, and namely the electric starter with the corresponding electromagnet coupling and release system provided with coupling gears, are thus eliminated.

The electric starter function is indeed directly performed by the electric axial flow machine 21, the rotors 26a, 26b of which also serve the flywheel function.

The use of the DC/AC converter 60 allows to control the start-up torque of engine 1 so as to reduce and optimize the electric power required at the start-up. When the reciprocating engine 1 rotates, the electric axial flow machine 21 behaves as generator and outputs a three-phase voltage, which is leveled out by the converter 60 which, being of reversible type, also provides an AC/DC conversion. The converter 60 further adjusts the voltage produced by the electric axial flow machine 21 which may not be intrinsically adjusted by generating a three-phase alternating output voltage according to the engine rotation speed and the load impedance . Such a direct voltage may be used to supply various electric utilities.

A starting and electricity generating system "embedded" into the reciprocating engine is thus made, which integrates the functions of starting and electricity generating with those of a flywheel, thus allowing a considerable simplification of the engine geometry, a high reduction of the total weight of the engine itself, an improvement of the working reliability and a reduction of the maintenance required for conventional, i.e. non-brushless, starters and generators .

Claims

1. A starting and electricity generating system for a reciprocating engine, wherein at least one piston (2) is movable in opposite directions within a respective combustion chamber (4) to rotate a driving shaft (9) coupled to a flywheel adapted to dynamically absorb a part of the driving torque generated during the active working phases of the piston in order to return it during the phases in which the piston absorbs work, characterized in that the flywheel consists of a rotor (20) of an electric, reversible axial flow machine (21) which has a stator (24) carried by the engine (1) .
2. A system according to claim 1, said rotor comprising at least two plates (26) made of non-magnetic metal material each of which carry a plurality of permanent magnets (27) angularly spaced from one another and facing the stator (24) on an annular portion thereof.
3. A system according to claim 2, wherein said permanent magnets (27) have a flat trapezoidal shape and are arranged in groups; the angular spacing between the magnets within the groups being smaller than the angular reciprocal spacing between the groups .
4. A system according to claim 2 or 3 , wherein the flywheel comprises a first plate (26a) and a second plate (26b), which are coaxial, axially spaced from each other and carry first and second reciprocally facing permanent magnets (27a, 27b) ; the stator (24) comprises a plurality of stator windings (28) which extend, at least in part, into the gap existing between the first and second plates (26a, 26b) , with the first and second magnets (27a, 27b) being arranged on opposite sides with respect to the stator windings (28) .
5. A system according to any one of the preceding claims, wherein said stator (24) comprises a toroidal core (34) made of magnetic material which carries a plurality of turns (35) arranged spaced from one another along the whole circumference of the toroidal core (34) ; said turns (35) being further reciprocally connected to form first, second and third stator windings of the electric machine (21) , of three-phase type.
PCT/IT2009/000105 2009-03-19 2009-03-19 Starting and electricity generating system for a reciprocating engine WO2010106560A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2009/000105 WO2010106560A1 (en) 2009-03-19 2009-03-19 Starting and electricity generating system for a reciprocating engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2009/000105 WO2010106560A1 (en) 2009-03-19 2009-03-19 Starting and electricity generating system for a reciprocating engine

Publications (1)

Publication Number Publication Date
WO2010106560A1 true WO2010106560A1 (en) 2010-09-23

Family

ID=41381597

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2009/000105 WO2010106560A1 (en) 2009-03-19 2009-03-19 Starting and electricity generating system for a reciprocating engine

Country Status (1)

Country Link
WO (1) WO2010106560A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015166258A1 (en) * 2014-05-02 2015-11-05 Cummins Generator Technologies Limited Vehicle with a start-stop system wherein the starter-generator is directly coupled to the internal combustion engine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999092A (en) * 1974-04-04 1976-12-21 Canadian General Electric Company Limited Permanent magnet synchronous dynamoelectric machine
JPS58126434A (en) * 1982-01-23 1983-07-27 Nissan Motor Co Ltd Smoothing device of torque in internal-combustion engine
US5939793A (en) * 1994-02-28 1999-08-17 Isad Electronic Systems Gmbh & Co. Kg Starter for drive units, especially internal combustion engines, and process for operating the same
EP0987433A1 (en) * 1998-09-18 2000-03-22 Siemens Aktiengesellschaft Starter-Alternator for a vehicle
US6064121A (en) * 1998-02-27 2000-05-16 Hamilton Sundstrand Corporation Axially compact generator set and refrigeration system employing the same
US6175178B1 (en) * 1999-10-21 2001-01-16 Christopher N. Tupper Low inductance electrical machine for flywheel energy storage
US20050035676A1 (en) * 2003-08-11 2005-02-17 Rahman Khwaja M. Gearless wheel motor drive system
EP1829725A2 (en) * 2006-03-02 2007-09-05 Peugeot Citroen Automobiles SA Layout of an electrical machine in an internal combustion engine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999092A (en) * 1974-04-04 1976-12-21 Canadian General Electric Company Limited Permanent magnet synchronous dynamoelectric machine
JPS58126434A (en) * 1982-01-23 1983-07-27 Nissan Motor Co Ltd Smoothing device of torque in internal-combustion engine
US5939793A (en) * 1994-02-28 1999-08-17 Isad Electronic Systems Gmbh & Co. Kg Starter for drive units, especially internal combustion engines, and process for operating the same
US6064121A (en) * 1998-02-27 2000-05-16 Hamilton Sundstrand Corporation Axially compact generator set and refrigeration system employing the same
EP0987433A1 (en) * 1998-09-18 2000-03-22 Siemens Aktiengesellschaft Starter-Alternator for a vehicle
US6175178B1 (en) * 1999-10-21 2001-01-16 Christopher N. Tupper Low inductance electrical machine for flywheel energy storage
US20050035676A1 (en) * 2003-08-11 2005-02-17 Rahman Khwaja M. Gearless wheel motor drive system
EP1829725A2 (en) * 2006-03-02 2007-09-05 Peugeot Citroen Automobiles SA Layout of an electrical machine in an internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015166258A1 (en) * 2014-05-02 2015-11-05 Cummins Generator Technologies Limited Vehicle with a start-stop system wherein the starter-generator is directly coupled to the internal combustion engine
GB2540093A (en) * 2014-05-02 2017-01-04 Cummins Generator Tech Ltd Vehicle with a start-stop system wherein the starter-generator is directly coupled to the internal combustion engine

Similar Documents

Publication Publication Date Title
US10326322B2 (en) Double-rotor flux-switching machine
DE3913806C2 (en) Hybrid engine
US7164219B2 (en) Electromechanical converter
US8653677B2 (en) Electromagnetic, continuously variable transmission power split turbo compound and engine and vehicle comprising such a turbo compound
US7082909B2 (en) Free-piston device with electric linear drive
US8143732B2 (en) Stationary genset power system having turbo-compounding
DE69628036T2 (en) Electromagnetic piston motor
JP4901659B2 (en) Internal combustion engine
US7728446B2 (en) Ring generator
EP0544092B1 (en) A device for starting an engine and generating power
ES2389818T3 (en) Variable Magnetic Gears
US6199650B1 (en) Drive system, especially for a motor vehicle, and method of operating same
US6577022B2 (en) Hybrid car and dynamo-electric machine
US6405701B1 (en) System for actively reducing rotational nonuniformity of a shaft, in particular, the drive shaft of an internal combustion engine, and method for this
US6532916B2 (en) Opposed piston linearly oscillating power unit
EP0847486B1 (en) Drive system, particularly for a motor vehicle
ES2405845T3 (en) Ship propulsion system
US4769993A (en) Turbocharger for internal combustion engines
CN101535611B (en) Hybrid engine assist system for vehicle
US7723886B2 (en) Continously controllable magnetodynamic gear
US5172784A (en) Hybrid electric propulsion system
US7095126B2 (en) Internal energy generating power source
US7863764B2 (en) Powertrain with torque converter-mounted generator for multiple voltage electrical power and method for assembling same
EP0876554B2 (en) Starter/generator for an internal combustion engine, in particular a vehicle engine
JP4656840B2 (en) Free piston device with electric linear drive

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09787667

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct app. not ent. europ. phase

Ref document number: 09787667

Country of ref document: EP

Kind code of ref document: A1