GB2213292A - Internal combustion engines - Google Patents
Internal combustion engines Download PDFInfo
- Publication number
- GB2213292A GB2213292A GB8728291A GB8728291A GB2213292A GB 2213292 A GB2213292 A GB 2213292A GB 8728291 A GB8728291 A GB 8728291A GB 8728291 A GB8728291 A GB 8728291A GB 2213292 A GB2213292 A GB 2213292A
- Authority
- GB
- United Kingdom
- Prior art keywords
- generator
- engine
- internal combustion
- polarity
- field windings
- 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- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 12
- 238000004804 winding Methods 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 2
- VOXZDWNPVJITMN-ZBRFXRBCSA-N 17β-estradiol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@H](CC4)O)[C@@H]4[C@@H]3CCC2=C1 VOXZDWNPVJITMN-ZBRFXRBCSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/06—Engines with means for equalising torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/52—Motors acting also as generators, e.g. starting motors used as generators for ignition or lighting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
An internal combustion engine 10 has a generator 11 which is drivingly connected thereto, the armature of the generator 11 is connected electrically to current storage means 13 and field windings of the generator 11 are connected to a current source 15, means 20 being provided to sense the speed of the engine 10 and reverse the polarity of the field windings of the generator 11 when the engine speed falls below a predetermined value, so that upon reversal of the polarity of the field windings, the generator 11 will act as a motor to drive the engine 10 until the idle speed is restored to the predetermined value. <IMAGE>
Description
INTERAL COMBUSTION ENGINES
The present invention relates to internal combustion engines.
In an attempt to improve the efficiency of internal combustion engines it is desirable that the idle speed be reduced as far as possible.
When a rnisfire occurs, the response of a conventional engine nanagement idle speed control systen is lirited to the tine between ignitions, that is upon sensing a drop in engine speed, correction cannot be appliec until the next cylinder firing is due. For example, with a six cylinder engine, running at 400 rp, the tine between ignition firings is 50 ms, under such conditions if a misfire occurs, the idle speed will drop by typically 80 rpn before any correction can be made. A second misfire, the probability of which will be much greater at the reduced idle speed, will drop the idle speed by a further 100 rpn and the engine will be liable to stall.At the low idle speeds envisaged, shock loads imposed by for example power steerina or air conditioning compressors, may also reduce the idle speed sufficiently to cause the engine to stall.
According to one aspect of the present invention, an internal combustion engine has a generator drivingly connected thereto, the armature of said generator being connected electrically to current storage means and field windings of the generator being connected to a current source, means being provided to sense the speed of the engine and reverse the polarity of the field windings of the generator when the engine speed falls below a predeterr.-ined value, so that upon reversal of Folarity of the field wir.cings, the generator will act as a rotor to drive the engine until the idle speed is restcred to the preeterined value.
Preferably the means for sensing the speed will comprise separate means driven by the engine together with pickup means which will provide a signal proportional to the engine speed. For example, a toothed wheel ray be provided on the crank shaft of the engine and an inductive pickup located adjacent to the teeth will provide an alternating signal the frequency of which is proportional to the engine speed. With this arrangement, with the engine idling at about 400 rpn, a toothed wheel having 60 teeth will detect a change in speed within about 1 ms.
The signal from the engine sensing moans will be delivered to suitable processing circuitry which may forr part of the engine management system or ray be an independent system, and will control switching means to reverse the polarity of the field windings. The switching means should switch polarity of the field windings within about 1 to 10 r.,s and preferably solid state switchiny means should be used for this purpose.
The above system is self regulating. SJhen the idle speed drops below the predeteritined value the polarity of the field windings are reversed so that the generator will act as a motor to increase the speed of the engine or maintain rotation of the engine until the next ignition occurs and the speed is increased back to the predetermined value, when the field windings will revert to their original polarity and the generator will resume charging of the current storage means.Maintenance of idle speed in this manner will typically consume about 70Q 17 over about 50 ms. Weans r,ay be provided to limit the duration or number of cycles over which the engine is driven by the generator to prevent excessive energy consumption and overheating of the generator.
As with conventional generator charging systems, voltage regulating means is required to ensure that the current storage means is not overcharged. However this regulating gleans must permit current to flow to the armature winding when the generator is functioning as a motor. Cut out means is however required to isolate the armature from the current storage means when the engine is stationary, in order to prevent the current storage means discharging.
An ernbodiment of the invention is now cescribed, by way of example only, with reference to the accornpanying drawing which illustrates diagrammatically an engine with an idle speed control system in accordance with the present invention.
As illustrated, an internal combustion engine 10 is drivingly connected to a generator 11 by means of a belt 12, in conventional manner.
The armature terminal 14 of generator 11 is connected to battery 13, the return connection being made via the vehicle's chassis. The field winding terrdinals 16 and 17 of generator 11 are connected to the terminals of the battery 13 via solid state switching means 15, by which the connections between the terminals 16 and 17 and the terminals of the battery 13 may be reversed.
A toothed wheel 18 is mounted on the crank shaft 21 of engine 10 for rotation therewith. An incuctive pickup 19 is positioned adjacent to the teeth of wheel 18, so that as the wheel 18 rotates, the varying gap between the pickup 19 and the wheel 18 as the teeth pass the pickup 19, will produce a varying electrical signal having a frequency proportional to the velocity of rotation of the wheel 18.
The signal fron pickup 19 is delivered to processing unit 20. This processing unit may typically include means for converting the varying signal from pickup 19 into an analogue signal proportional to the speed of rotation of the wheel iS; and threshold means which r; will produce a control signal ashen the analogue signal falls below precetermined value, this control signal being used to switci. switching means 15 and thus reverse the polarity of the field windings of generator 11.
In operation, while engine 10 is idling at the desired idle speed, say 400 rpm, the processing unit 20 will produce defined control signal and switching means 15 will connect the field windings of generator 11 to the battery 13 so that the generator 11 will operate in its generating node and will produce a current to charge battery 13. If however the idle speed arops below 400 rpm, the processing unit 20 will adjust the control signal to switch switching means 15 to reverse the polarity of the field windings of generator 11 causing the generator to function as a motor and drive the crank shaft of engine 10 via belt 12. This auxiliary drive, will maintain rotation of the crank shaft 21 until the next ignition, when the idle speed should increase to 400 rpm, or for a preset number of ignition intervals.
As soon as the idle speed is restored to the desired value, processing unit 20 will switch switching means .15 so that the field windings of generator 11 will return to their original polarity and the generator will revert to its generating moce.
Claims (5)
1. An internal combustion engine having a generator drivingly connected thereto, the armature of the generator being connected electrically to current storage means and field windings of the generator being connected to â current source, means being provided to sense the speed of the engine and reverse the polarity of the field windings of the generator when the engine speed falls below preceternined value, so that upon reversal of the polarity of the fielo windings, the generator will act as a notor to drive the engine until the idle sped is restored to the predeterrined value.
2. An internal combustion engine according to claim 1 in which a toothed wheel is provided on the crank shaft of the engine, an inductive pickup being positioned adjacent the teeth of the wheel to provide a signal the frequency of which is proportional to the rotational speed of the wheel.
3. An internal combustion engine according to claiit 2 in which the signal is processed by a processing unit, said processing unit producing a control signal when the engine speed falls below a predetermined value, said control signal switching solid state switching means to reverse the polarity cf the field windings.
4. An internal combustion engine according to any one of the preceding claims in which the generator is connected to the crank shaft of the engine by means of belt and pulleys.
5. An internal combustion engine substantially as described herein with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8728291A GB2213292A (en) | 1987-12-03 | 1987-12-03 | Internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8728291A GB2213292A (en) | 1987-12-03 | 1987-12-03 | Internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8728291D0 GB8728291D0 (en) | 1988-01-06 |
| GB2213292A true GB2213292A (en) | 1989-08-09 |
Family
ID=10627935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8728291A Withdrawn GB2213292A (en) | 1987-12-03 | 1987-12-03 | Internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2213292A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0427568A1 (en) * | 1989-11-09 | 1991-05-15 | Isuzu Motors Limited | Apparatus for reducing engine idling vibration |
| WO1998039560A1 (en) * | 1997-03-06 | 1998-09-11 | Isad Electronic Systems Gmbh & Co. Kg | Propulsion system, especially for a motor vehicle and method for regulating the idling speed of an internal combustion engine |
| FR2784714A1 (en) * | 1998-10-16 | 2000-04-21 | Renault | Fuel injection control system, comprises an alternator connected to a flywheel mechanism when the electrical demand is greater than what can be supplied |
| FR2825845A1 (en) * | 2001-06-08 | 2002-12-13 | Mitsubishi Electric Corp | Dynamo electric rotating machine for motor vehicle, uses injection of current into alternator stator to sustain speed and hence voltage output of alternator as extra load is switched in while engine is slowing |
-
1987
- 1987-12-03 GB GB8728291A patent/GB2213292A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0427568A1 (en) * | 1989-11-09 | 1991-05-15 | Isuzu Motors Limited | Apparatus for reducing engine idling vibration |
| US5105776A (en) * | 1989-11-09 | 1992-04-21 | Isuzu Motors Limited | Apparatus for reducing engine idling vibration |
| WO1998039560A1 (en) * | 1997-03-06 | 1998-09-11 | Isad Electronic Systems Gmbh & Co. Kg | Propulsion system, especially for a motor vehicle and method for regulating the idling speed of an internal combustion engine |
| US6085723A (en) * | 1997-03-06 | 2000-07-11 | Isad Electronic Systems Gmbh & Co. Kg | Apparatus and methods for controlling idling speed of an internal combustion engine by reducing torque fluctuations |
| FR2784714A1 (en) * | 1998-10-16 | 2000-04-21 | Renault | Fuel injection control system, comprises an alternator connected to a flywheel mechanism when the electrical demand is greater than what can be supplied |
| FR2825845A1 (en) * | 2001-06-08 | 2002-12-13 | Mitsubishi Electric Corp | Dynamo electric rotating machine for motor vehicle, uses injection of current into alternator stator to sustain speed and hence voltage output of alternator as extra load is switched in while engine is slowing |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8728291D0 (en) | 1988-01-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |