CN202066472U - Device for judging crankshaft position during engine cutoff - Google Patents
Device for judging crankshaft position during engine cutoff Download PDFInfo
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- CN202066472U CN202066472U CN201120102257XU CN201120102257U CN202066472U CN 202066472 U CN202066472 U CN 202066472U CN 201120102257X U CN201120102257X U CN 201120102257XU CN 201120102257 U CN201120102257 U CN 201120102257U CN 202066472 U CN202066472 U CN 202066472U
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- target wheel
- gear teeth
- crankshaft
- tooth top
- engine
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Abstract
The utility model discloses a device for judging crankshaft position during engine cutoff, and aims at providing a device for judging the crankshaft position during engine cutoff which judges forward and reversed rotation, is sensitive in reaction and has high accuracy. The device comprises a target wheel, a magnetoelectric tachometric transducer and a control system, wherein the target wheel is arranged on the engine crankshaft; the magnetoelectric tachometric transducer is arranged below the target wheel, and the control system is connected with the magnetoelectric tachometric transducer; the gear teeth of the target wheel is of a dissymmetric addendum structure. The device utilizes the variation rule of the different induced electromotive force produced by a coiler of the magnetoelectric tachometric transducer of the dissymmetric addendum structure when the target wheel rotates forwards and reversedly to judge whether the engine crankshaft rotates reversedly, and the device records the gear number turned by the target wheel to measure the turning angle of the target wheel, and finally judges the position of the crankshaft during engine cutoff.
Description
Technical field
The utility model relates to a kind of device of crank position when differentiating engine shutdown, and a kind of device of crank position when differentiating engine shutdown that particularly relates to a kind of target wheel that adopts asymmetric tooth top structure belongs to technical field of automobile parts.
Background technology
When automobile travels, can often be in the idle stop state in the city of traffic congestion.In the engine shutdown process, the resultant moment that engine crankshaft is subjected to pivoting friction torque and gas in the jar moment is used as the damping retarded motion.When the resultant moment of pivoting friction torque and gas in the jar moment be on the occasion of the time, promote the engine crankshaft forward rotation; When the resultant moment of pivoting friction torque and gas in the jar moment is negative value, promote the engine crankshaft backward rotation.Therefore, engine crankshaft the situation that forward and reverse replace can occur in the engine shutdown process, and engine crankshaft just can stop at certain position when the kinetic energy of engine crankshaft decays to zero.The working position of bent axle when the position of bent axle can be differentiated in-cylinder direct fuel-injection engine and restarts when shutting down by recording engine; the working position of bent axle accurately determines the working position of each cylinder during then with engine restart; vehicle control syetem controls successively according to firing order the oil spout and the igniting of each cylinder according to the working position of each cylinder that determines; make fuel oil spray into specific cylinder, thereby realize the starting of in-cylinder direct fuel-injection engine-the stop Fast starting in the technology.Can in the time of therefore, rapid and precisely determining engine shutdown the position of bent axle becomes starting-the stop key factor of technology of restriction in-cylinder direct fuel-injection engine.
The device of crank position generally adopts magnetoelectric sensor, photoelectric sensor or hall sensor as crankshaft rotational speed sensor when at present differentiating engine shutdown, crankshaft rotational speed sensor be installed in target wheel on the engine crankshaft the match rotating speed and the corner of incompatible measurement engine crankshaft with symmetrical tooth top structure.The defective of existing apparatus is: it can only measure the angle that engine crankshaft turns over; and can not differentiate the main story of engine crankshaft or turning to of counter-rotating; the accurate stop position of bent axle in the time of also just can't determining engine shutdown; can only wait engine bent axle when resetting to turn over a circle; after control system receives the top dead centre signal of bent axle; judge the working position of engine crankshaft again according to the engine cam shaft position signal, this just causes engine that arranged long time delay when resetting.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of and can rotating judges, is quick on the draw, the device of accuracy is high when being used to differentiate engine shutdown crank position.This device adopts the target wheel 1 of asymmetric tooth top structure to combine with magnetoelectric tachometric transducer 4, and crank position when accurately differentiating engine shutdown by control system 7.
Principle of work of the present utility model is: engine crankshaft 3 drives target wheel 1 and rotates, when target wheel 1 relative magnetoelectric tachometric transducer 4
During forward or reverse; target wheel 1 cutting permanent magnet 5 produces the magnetic line of force; the trapezoidal tooth top 8 of the gear teeth 2 and rectangle tooth top 9 respectively and the magnetic air gap between the permanent magnet 5 vary in size; thereby the magnetic flux change rule difference when making engine crankshaft 3 forward and reverse in the magnetoelectric tachometric transducer 4; induction electromotive force Changing Pattern difference when finally causing engine crankshaft 3 forward and reverse in the coil 6; control system 7 judges by the different induction electromotive force Changing Patterns in the comparator coil 6 whether engine crankshaft 3 reverses; write down target wheel 1 number of teeth that turns over simultaneously; just can measure the angle that forward or reverse takes place target wheel 1, the accurate position of engine crankshaft 3 when finally calculating engine shutdown.
The utility model is achieved by following technical proposals:
A kind of device of crank position when differentiating engine shutdown; comprise the target wheel 1 that is installed on the engine crankshaft, the speed probe 4 and the control system 7 that is connected with speed probe that is installed in target wheel below, the gear teeth 2 of described target wheel 1 press evenly distribution and be asymmetric tooth top structure of circumference.
The gear teeth 2 center lines one side of described target wheel 1 is trapezoidal tooth top 8, and the gear teeth 2 center line opposite sides are rectangle tooth top 9, and the difform tooth top in the gear teeth 2 center line both sides constitutes the asymmetric tooth top structure of the gear teeth 2 jointly.
Described target wheel 1 is made by permeability magnetic material.
Described speed probe adopts magnetoelectric tachometric transducer 4.
The beneficial effects of the utility model are: (1) this device not only can be measured engine speed and corner, whether bent axle reverses in the time of simultaneously can judging engine shutdown, thereby the position of bent axle when accurately differentiating engine shutdown, for engine is reset the accurate working position that bent axle is provided, for the engine Fast starting provides technique guarantee; Time delay when (2) having shortened engine restart; (3) simple in structure, be easy to make.
Description of drawings
Fig. 1 is a kind of apparatus structure synoptic diagram of crank position when differentiating engine shutdown;
Fig. 2 is a target wheel gear teeth profile of tooth synoptic diagram;
Fig. 3 is the Changing Pattern figure of target wheel magnetic flux and electromotive force when just changeing;
The Changing Pattern figure of magnetic flux and electromotive force when Fig. 4 is the counter-rotating of target wheel.
Among the figure: 1. target is taken turns 2. gear teeth, 3. engine crankshafts, 4. magnetoelectric tachometric transducers, 5. permanent magnets, 6. coils, 7. control system, 8. trapezoidal tooth top 9. rectangle tooth tops
Embodiment
Illustrated embodiment further specifies particular content of the present utility model and embodiment thereof with reference to the accompanying drawings.
Fig. 1 is a kind of apparatus structure synoptic diagram of crank position when differentiating engine shutdown, and target wheel 1 is installed on the engine crankshaft 3, and engine crankshaft 3 drives 1 rotation of targets wheel; Magnetoelectric tachometric transducer 4 is installed in target and takes turns 1 below and leave the gap, and when relative magnetoelectric tachometric transducer 4 forward or reverse of target wheel 1, the magnetic line of force that target wheel 1 cutting permanent magnet 5 produces makes the coil 6 generation induction electromotive forces in the magnetoelectric tachometric transducer 4.
When the gear teeth 2 of target wheel 1 during near the magnetic pole of permanent magnets 5, magnetic air gap between the gear teeth 2 and the permanent magnet 5 reduces, cause the magnetic resistance in the magnetic circuit between the gear teeth 2 and the permanent magnet 5 to reduce, thereby the magnetic flux in the magnetoelectric tachometric transducer 4 is increased, make variation rate of magnetic flux in the magnetoelectric tachometric transducer 4 greater than zero, make induction electromotive force that coil 6 produces on the occasion of; When the gear teeth 2 leave the magnetic pole of permanent magnet 5, magnetic air gap between the gear teeth 2 and the permanent magnet 5 increases, cause the magnetic resistance in the magnetic circuit between the gear teeth 2 and the permanent magnet 5 to increase, thereby the magnetic flux in the magnetoelectric tachometric transducer 4 is reduced, make variation rate of magnetic flux in the magnetoelectric tachometric transducer 4 less than zero, the induction electromotive force that coil 6 is produced is a negative value.Revolution is crossed gear teeth 2, magnetic flux in the magnetoelectric tachometric transducer 4 just is periodic variation, coil 6 can produce the one-period sexual intercourse and become induction electromotive force, be that a maximal value and a minimum value appear in induction electromotive force, coil 6 is also just correspondingly exported the voltage signal of an alternation and is given control system 7.
Fig. 2 is the profile of tooth synoptic diagram of the gear teeth 2 of target wheel 1, and the gear teeth 2 center lines one side is trapezoidal tooth top 8, and the gear teeth 2 center line opposite sides are rectangle tooth top 9, the asymmetric tooth top structure of the common formation of the difform tooth top in the gear teeth 2 center line both sides.Because the gear teeth 2 center line both sides tooth top shapes are asymmetric, so the magnetic air gap between the magnetic pole of trapezoidal tooth top 8 and permanent magnet 5 is different from the magnetic air gap between the magnetic pole of rectangle tooth top 9 and permanent magnet 5, the different magnetic air gaps that asymmetric tooth top structure causes make that the magnetic flux change rule in the magnetoelectric tachometric transducer 4 is asymmetric.Magnetic air gap between the magnetic pole of trapezoidal tooth top 8 and permanent magnet 5 is greater than the magnetic air gap between the magnetic pole of rectangle tooth top 9 and permanent magnet 5, make the magnetic flux change that magnetic flux change in the magnetoelectric tachometric transducer 4 that trapezoidal tooth top 8 causes will cause faster than rectangle tooth top 9, thereby the magnetic flux in the magnetoelectric tachometric transducer 4 curve over time is an asymmetrical figure, the abc section of magnetic flux change curve and cde section are asymmetric among Fig. 3, and a ' b ' of magnetic flux change curve c ' section also is asymmetric with c ' d ' e ' section among Fig. 4.
When engine crankshaft 3 was just changeing, engine crankshaft 3 drives target wheel 1 just to be changeed, and magnetic flux in magnetoelectric tachometric transducer 4 and coil 6 produce induction electromotive force as shown in Figure 3; When engine crankshaft 3 counter-rotatings, engine crankshaft 3 drives 1 counter-rotating of target wheel, and magnetic flux in magnetoelectric tachometric transducer 4 and coil 6 produce induction electromotive force as shown in Figure 4.Flux curves and induction electric power curve among comparison diagram 3 and Fig. 4 can see that the Changing Pattern of the flux curves of flux curves when reversing when just changeing is different.The Changing Pattern of the induction electric power curve when causing forward and reverse by the different magnetic flux change rule of forward and backward is also different, and the positive maximal value of induction electromotive force is consulted shown in Figure 3 greater than negative peaked absolute value when just changeing; The positive maximal value of induction electromotive force is consulted shown in Figure 4 less than negative peaked absolute value during counter-rotating.Control system 7 during just according to engine crankshaft 3 forward and reverse different induction electromotive force Changing Patterns judge the sense of rotation of engine crankshaft; write down target wheel 1 number of teeth that turns over simultaneously and measure the corner of target wheel 1, the accurate position of bent axle when finally judging engine shutdown.
Claims (4)
1. the device of a crank position when differentiating engine shutdown; comprise the target wheel (1) that is installed on the engine crankshaft, the speed probe (4) and the control system that is connected with speed probe (7) that is installed in target wheel below; it is characterized in that the gear teeth (2) of described target wheel (1) are pressed the even distribution of circumference and are asymmetric tooth top structure.
2. a kind of device of crank position when differentiating engine shutdown according to claim 1; it is characterized in that; the gear teeth (2) center line one side of described target wheel (1) is trapezoidal tooth top (8); the gear teeth (2) center line opposite side is rectangle tooth top (9), and the difform tooth top in the gear teeth (2) center line both sides constitutes the asymmetric tooth top structure of the gear teeth (2) jointly.
3. a kind of device of crank position when differentiating engine shutdown according to claim 1 and 2 is characterized in that described target wheel (1) is made by permeability magnetic material.
4. a kind of device of crank position when differentiating engine shutdown according to claim 1 is characterized in that described speed probe adopts magnetoelectric tachometric transducer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120102257XU CN202066472U (en) | 2011-04-11 | 2011-04-11 | Device for judging crankshaft position during engine cutoff |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120102257XU CN202066472U (en) | 2011-04-11 | 2011-04-11 | Device for judging crankshaft position during engine cutoff |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202066472U true CN202066472U (en) | 2011-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120102257XU Expired - Fee Related CN202066472U (en) | 2011-04-11 | 2011-04-11 | Device for judging crankshaft position during engine cutoff |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202066472U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155313A (en) * | 2011-04-11 | 2011-08-17 | 吉林大学 | Device for distinguishing position of crank shaft in stop of engine |
| CN111094719A (en) * | 2017-09-08 | 2020-05-01 | 本田技研工业株式会社 | Internal combustion engine |
-
2011
- 2011-04-11 CN CN201120102257XU patent/CN202066472U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155313A (en) * | 2011-04-11 | 2011-08-17 | 吉林大学 | Device for distinguishing position of crank shaft in stop of engine |
| CN111094719A (en) * | 2017-09-08 | 2020-05-01 | 本田技研工业株式会社 | Internal combustion engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20120411 |