CN209948890U

CN209948890U - Measuring system for engine crankshaft position

Info

Publication number: CN209948890U
Application number: CN201920895159.2U
Authority: CN
Inventors: 付永锋
Original assignee: Gongcheng Electrical Apparel (chongqing) Co Ltd; Chongqing Gongcheng Investment Co Ltd
Current assignee: Gongcheng Electrical Apparel (chongqing) Co Ltd; Chongqing Gongcheng Investment Co Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-01-14
Anticipated expiration: 2029-06-14

Abstract

A measuring system for the position of a crankshaft of an engine comprises a motor, wherein the motor comprises a stator core and a rotor assembled outside the stator core. The stator core is provided with a plurality of teeth, a groove is formed between every two adjacent teeth, and coils are wound on the teeth. The stator core is provided with a unique Hall device capable of generating Hall signals, the inner circumference of the rotor is provided with magnetic steel, the magnetic steel comprises a plurality of pairs of NS magnetic poles, the outer circumference of the rotor is provided with at least one boss, and the outer edge of the at least one boss is provided with a pulse trigger capable of generating pulse signals. The utility model discloses can judge the engine crankshaft position more accurately, realize the oil spout of electricity injection system and the accurate control of igniteing.

Description

Measuring system for engine crankshaft position

Technical Field

The utility model belongs to the technical field of the engine technique and specifically relates to a measurement system of engine crankshaft position.

Background

Along with the electronic fuel injection of the motorcycle, the requirement on the judgment precision of the crankshaft position is improved, and the accurate judgment information of the crankshaft position cannot be separated because the accurate fuel injection time of the electronic fuel injection and the power-on time of an ignition coil are controlled. The existing crankshaft position judging method is that a boss and a pulse generator are arranged on the outer edge of a magneto rotor, the crankshaft position is judged according to different pulse signals of the boss, and oil injection and ignition are controlled by electric injection software. But relying solely on the pulse signal from the boss to determine crankshaft position is still not accurate enough.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides a measurement system of engine crankshaft position, it can accurately judge engine crankshaft position, realizes the oil spout of electricity injection system and the accurate control of igniteing.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: the utility model provides a measurement system of engine crankshaft position, its includes the motor, the motor includes stator core and assembles the rotor outside stator core, be equipped with a plurality of teeth on the stator core, be equipped with the groove between two adjacent teeth, around there being the coil on the tooth, stator core is last to be equipped with only one hall device that can produce hall signal, is equipped with the magnet steel on the interior circumference of rotor, and the magnet steel includes a plurality of pairs NS magnetic pole, is equipped with at least one boss on the outer circumference of rotor, the outer edge of at least one boss is equipped with the pulse trigger that can produce pulse signal.

As a further improvement of the present invention, the pairs of NS magnetic poles are "N-S-N-S-N-S" joined end to form a ring.

As a further improvement of the utility model, the Hall device is arranged in the groove.

As a further improvement of the utility model, one of them tooth part is lost, hall device locates the position that this tooth is lost.

As the utility model discloses a further improvement, pulse signal includes positive pulse signal and the negative-going pulse signal that the boss produced when the boss is close to pulse trigger and produces when the boss leaves pulse trigger, the NS magnetic pole is n right, and n produces n group hall signal to the magnetic pole.

As the utility model discloses a further improvement, pulse signal includes that the negative-going pulse signal that the boss produced when being close to pulse trigger and the positive pulse signal that the boss produced when leaving pulse trigger, the magnetic pole is n right, and n produces n group hall signal to the magnetic pole.

The utility model has the advantages that: the utility model discloses a hall signal that the pulse signal that boss and pulse trigger produced deuterogamies hall device and produces can judge engine crankshaft position, realize the oil spout of electricity injection system and the accurate control of igniteing more accurately.

Drawings

Fig. 1 is a schematic structural diagram of a measurement system for measuring the position of an engine crankshaft according to the present invention.

Fig. 2 is a waveform diagram generated by the measuring system for the position of the engine crankshaft of the present invention.

With reference to the above drawings, supplementary explanation is made as follows:

1-stator core 11-tooth

12-groove 2-rotor

3-coil 4-Hall device

5-magnet steel 6-boss

7- - -pulse trigger

Detailed Description

Referring to fig. 1 and 2, a system for measuring a crankshaft position of an engine includes a motor including a stator core 1 and a rotor 2 assembled outside the stator core 1. The stator core 1 is provided with a plurality of teeth 11, a slot 12 is arranged between two adjacent teeth 11, and the teeth 11 are wound with coils 3. The stator core 1 is provided with a single Hall device 4 capable of generating Hall signals, the inner circumference of the rotor 2 is provided with magnetic steel 5, the magnetic steel 5 comprises a plurality of pairs of NS magnetic poles, the outer circumference of the rotor 2 is provided with at least one boss 6, and the outer edge of the at least one boss 6 is provided with a pulse trigger 7 capable of generating pulse signals.

Referring to FIG. 1, the pairs of NS poles are looped end-to-end with each other. That is, the N pole of the second pole is connected to the S pole of the first pole, the S pole of the second pole is connected to the N pole of the third pole … …, and so on until the S pole of the Nth pole is connected to the N pole of the first pole.

In the first embodiment, the hall device 4 is provided in the groove 12.

In the second embodiment, one of the teeth 11 is partially missing, and the hall device 4 is provided at the position where the tooth 11 is missing.

Referring to fig. 2, in embodiment 1 of the present invention, the positive and negative pulse signals generated by the hall devices 0 to 6 4 correspond to the positive and negative triangular hall signals of the pulse trigger 7, and are waveform diagrams generated by a rotation of the motor by one rotation (360 degrees). The pulse signals comprise positive pulse signals generated when the boss 6 is close to the pulse trigger 7 and negative pulse signals generated when the boss 6 is away from the pulse trigger 7, the NS magnetic poles are n pairs, and the n pairs of magnetic poles generate n groups of Hall signals.

The winding direction of the coil 3 or the polarity of the magnetic steel 5 can be adjusted first to be negative and then to be positive, that is, the positive and negative pulse signals generated in the embodiment 2 are just opposite to those generated in the embodiment 1: the pulse signals comprise negative pulse signals generated when the boss 6 is close to the pulse trigger 7 and positive pulse signals generated when the boss 6 is away from the pulse trigger 7, the number of the magnetic poles is n, and n groups of Hall signals are generated by the n pairs of the magnetic poles.

The four strokes of the engine are judged by firstly finding out the reference position of the engine according to the assembly position relation of the boss 6 and the crankshaft, respectively defining the Hall signals within 720 degrees of two revolutions of the motor as No. 0-No. 11 after finding out the reference position of the engine, finding out two Hall signals corresponding to No. 0 and No. 6, and comparing the passing time of the two Hall signals to distinguish the compression top dead center from the exhaust top dead center, thereby determining the suction stroke and the power stroke. Therefore, the fuel injection and the ignition can be carried out in the compression stroke corresponding to the No. 6 waveform, so that the engine is started, namely, the fuel injection and the ignition of the electronic fuel injection system are accurately controlled.

The utility model discloses a theory of operation does: when the motor rotates, the boss 6 can rotate along with the rotor 2, the pulse trigger 7 can generate a pulse signal when the motor rotates for one circle, and the Hall device 4 can generate Hall signals with high and low levels alternating with each other along with the polarity conversion of the magnetic steel 5. The utility model discloses a hall signal that the pulse signal that boss 6 and pulse trigger 7 produced deuterogamies hall device 4 production can judge engine crankshaft position, realize the oil spout of electricity injection system and the accurate control of igniteing more accurately.

Claims

1. The utility model provides a measurement system of engine crankshaft position, its includes the motor, the motor includes stator core and assembles the outer rotor of stator core, be equipped with a plurality of teeth on the stator core, be equipped with the groove between two adjacent teeth, around there being coil, characterized by on the tooth: the stator core is provided with a unique Hall device capable of generating Hall signals, the inner circumference of the rotor is provided with magnetic steel, the magnetic steel comprises a plurality of pairs of NS magnetic poles, the outer circumference of the rotor is provided with at least one boss, and the outer edge of the at least one boss is provided with a pulse trigger capable of generating pulse signals.

2. The system of claim 1, wherein: the pairs of NS magnetic poles are connected end to form a ring.

3. The system of claim 1, wherein: the Hall device is arranged in the groove.

4. The system of claim 1, wherein: one of the teeth is partially missing, and the hall device is provided at the position where the tooth is missing.

5. The system of claim 1, wherein: the pulse signals comprise positive pulse signals generated when the boss is close to the pulse trigger and negative pulse signals generated when the boss leaves the pulse trigger, the NS magnetic poles are n pairs, and the n pairs of magnetic poles generate n groups of Hall signals.

6. The system of claim 1, wherein: the pulse signals comprise negative pulse signals generated when the boss is close to the pulse trigger and positive pulse signals generated when the boss is away from the pulse trigger, the number of the magnetic poles is n, and n groups of Hall signals are generated by the n pairs of the magnetic poles.