CN108518294B

CN108518294B - Rotary position detection actuator for ignition control of gas engine

Info

Publication number: CN108518294B
Application number: CN201810269316.9A
Authority: CN
Inventors: 马库斯·安东·格罗梅尔
Original assignee: Heinzmann Power Control Jiaxing Co ltd
Current assignee: Heinzmann Power Control Jiaxing Co ltd
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2023-11-10
Anticipated expiration: 2038-03-29
Also published as: CN108518294A

Abstract

A rotary position detecting actuator for ignition control of a gas engine includes a housing, a position sensing device, and a dial. The housing has an axial bore. The position sensing device includes a base plate, a drive shaft, a cam, and a distance sensor. The cam comprises a sensing section, a first idle section and a second idle section. The induction section is an Archimedes spiral line, and the axis of the driving shaft and the starting point of the Archimedes spiral line are arranged in a deviated mode. The symmetry axis of the signal wave in the advancing direction is perpendicular to the connecting line of the axis of the driving shaft and the starting point of the Archimedes spiral. According to the actuator, the sectional contour line of the induction section is an Archimedes spiral line, so that the distance change between the distance sensor and the induction section is linear, and the stability of output is facilitated. Finally, the current output size can be clearly known due to the dial, so that the control is easier.

Description

Rotary position detection actuator for ignition control of gas engine

Technical Field

The application belongs to the technical field of engines, and particularly relates to a rotary position detection actuator for ignition control of a gas engine.

Background

Modern engines require precise measurement of the respective position of the camshaft to control the timing of fuel injection in order to achieve reduced fuel consumption and emissions requirements, optimizing overall engine operation. At present, the method for measuring the phase of the cam shaft of the internal combustion engine is to integrate or install a cam shaft signal panel on the cam shaft, wherein the signal panel and the cam shaft have corresponding relation, and the phase of the cam shaft is prejudged by measuring the position relation on the signal panel.

The above-mentioned technical solution has at least two drawbacks, one is that the structure is complex, and in the detection of the corresponding position of the camshaft, not only a mechanical structure such as a mechanical connection relationship between the camshaft and the signal panel, but also a corresponding signal processing circuit such as an electrical connection between the signal panel and the signal processing circuit and a technical solution of signal processing are required, which will certainly increase the complexity of the engine. Secondly, most cams on the existing cam shafts are of symmetrical structures, so that the output change curve of the cam shafts is always a U-shaped line or parabola, and the output is hard to control for a user, so that the complexity of a driving device using the engine is increased.

Disclosure of Invention

In view of the above, the present application provides a rotational position detecting actuator for ignition control of a gas engine, which has a simple structure and is easy to control, so as to solve the above-mentioned problems.

A rotary position detecting actuator for ignition control of a gas engine includes a housing, a position sensing device provided in the housing, and a dial provided outside the housing. The housing has an axial bore. The position sensing device comprises a base plate, a cam fixedly arranged on the driving shaft, a cam sleeved on the driving shaft and a distance sensor which is arranged at a certain interval with the cam and is fixedly arranged on the driving shaft. The profile line of the section of the cam perpendicular to the axial direction of the driving shaft comprises a sensing section, a first idle section arranged at one end of the sensing section and a second idle section arranged at the other end of the sensing section. The induction section is an Archimedes spiral line, and the axis of the driving shaft and the starting point of the Archimedes spiral line are arranged in a deviated mode. The first idle section is a straight line, and the second idle section is a straight line. The distance sensor emits a signal wave. The symmetry axis of the signal wave in the advancing direction is perpendicular to a connecting line of the axis of the driving shaft and the starting point of the Archimedes spiral, the driving shaft is rotationally arranged in the shaft hole of the shell, and the dial comprises an end cover, a scale gauge arranged on the end cover and a pointer arranged on the driving shaft.

Further, the position sensing device further comprises a circuit board fixedly arranged on the shell, and the distance sensor is arranged on the circuit board.

Further, the position sensing device further comprises a first limiting mechanism and a second limiting mechanism which are respectively arranged on two sides of the cam, wherein the first limiting mechanism and the second limiting mechanism comprise a first limiting plate and a second limiting plate which are respectively fixedly arranged, and a first limiting column and a second limiting column which are respectively fixedly arranged on the base plate.

Further, when the first limiting post abuts against the first limiting plate, the distance between the distance sensor and the sensing section is closest, and when the second limiting post abuts against the second limiting plate, the distance between the distance sensor and the sensing section is farthest.

Further, the first limiting plate and the second limiting plate are respectively provided with a buffer cushion.

Further, the pointer points to a minimum value of the scale when the distance sensor is closest to the sensing section.

Further, the pointer points to a maximum value of the scale when the distance sensor is farthest from the sensing section.

Further, the housing is a blind cartridge.

Further, the signal wave is a sine wave.

Further, the signal wave is a square wave.

Compared with the prior art, the contour line of the cam of the position sensing device, which is perpendicular to the axial section of the driving shaft, comprises a sensing section, the sensing section is an Archimedes spiral line, and the axle center of the driving shaft and the pole of the Archimedes spiral line are arranged in a deviated mode, so that when the cam rotates along with the driving shaft in a reciprocating mode, the distance between the distance sensor and the sensing section only reciprocates between the maximum distance and the minimum distance. And secondly, as the section contour line of the induction section is an Archimedes spiral line, the distance change between the distance sensor and the induction section is in linear change, and the stability of output is facilitated. Finally, since the actuator has the dial, the current output size can be clearly known, so that the control is easier.

Drawings

Fig. 1 is an exploded view of a rotary position detecting actuator for ignition control of a gas engine according to the present application.

Fig. 2 is a schematic view of a cam of the rotary position detecting actuator for ignition control of the gas engine of fig. 1.

Fig. 3 is a schematic view illustrating another angle of the rotational position detecting actuator for ignition control of the gas engine of fig. 1.

Detailed Description

Specific embodiments of the present application are described in further detail below. It should be understood that the description herein of the embodiments of the application is not intended to limit the scope of the application.

Fig. 1 to 3 are schematic structural views of a rotary position detecting actuator for ignition control of a gas engine according to the present application. The rotational position detecting actuator for ignition control of a gas engine includes a housing 10, a position sensing device 20 provided in the housing, and a dial 30 provided outside the housing. It is conceivable that the rotational position detection actuator for ignition control of the gas engine further includes other functional modules such as a driving device, an electric device, and an assembly component, etc., which are known to those skilled in the art, and will not be described in detail herein.

The housing 10 may be a blind cartridge and has an axial bore 11. The housing 10 is used to house and hold various components, such as the position sensing device 20, which may be cast from a metal, such as an aluminum alloy, or may be made from a plastic material. In this embodiment, the housing 10 is made of a plastic material.

The position sensing device 20 comprises a base plate 21, a driving shaft 22 fixed on the base plate 21, a cam 23 sleeved on the driving shaft 22, a distance sensor 24 arranged at intervals from the cam 23 and fixed in position, a circuit board 25 for being arranged on the distance sensor 24, and two first and second limiting mechanisms 26 and 27 respectively arranged on two sides of the cam 23. It is conceivable that the position sensing device further includes some other functional modules, such as a circuit signal module for processing signals formed by electronic components disposed on the circuit board 25, but this is a technology known to those skilled in the art and will not be described herein.

The base plate 21 may be a steel plate for providing the driving shaft 22, and the cam 23, and other functional modules such as a limit structure, etc. The structure and shape of the substrate 21 are determined according to practical needs, and will not be described herein.

The drive shaft 22 is fixedly arranged on the base plate 21, it being conceivable that the drive shaft 22 comprises both an input for inputting power. But as the drive shaft 22 itself, it may be a cylinder. The drive shaft 22 is rotatably disposed in the shaft hole 11 of the housing 10.

The cam 23 is fixedly arranged on the base plate 21 and sleeved on the driving shaft 22, so that when the driving shaft 22 rotates, the base plate 21 and the cam 23 rotate reciprocally together with the driving shaft 22. Of course, the cam 23 may include other structures, such as a fixed structure, etc. The contour line of the cam 23 in a cross section perpendicular to the axial direction of the driving shaft 22 includes a sensing section 231, a first idle section 232 provided at one end of the sensing section 231, and a second idle section 233 provided at the other end of the sensing section 231. The sensing section 231 corresponds to the distance sensor 24, i.e. when the signal wave output by the distance sensor 24 reaches the sensing section 231, the distance sensor 24 will output a signal. The induction section 231 is an archimedes spiral. It is known that a moving ray OP rotates at an equiangular velocity around a pole O while moving at a constant velocity along the moving ray OP at a start point P, the locus of which is called archimedes screw. Since the archimedes spiral is a prior mathematical knowledge, it is not described in detail here. The axis of the drive shaft 22 is offset from the pole of the archimedes spiral. Since the sectional profile line of the sensing section 231 is an archimedes spiral, the distance between the distance sensor 24 and the sensing section 231 varies linearly when the cam 23 rotates, so that the voltage value outputted from the distance sensor 24 varies linearly. Thus, when adjusted, it is advantageous to smooth the output of the entire machine with the position sensing device. The first idle section 232 may be a straight line or an arc, which is designed according to practical needs. The second idle section 233 may be the same as the first idle section 232 and also be straight, so that the volume of the cam 23 may be reduced and the weight may be reduced. The first idle section 232 and the second idle section 233 may be parallel to each other or may not be parallel to each other, and in this embodiment, the first and second idle sections 232, 233 are not parallel to each other. It is of course contemplated that the other ends of the first and second idler segments 232, 233 may be directly connected or may be connected by other straight or curved lines. In this embodiment, the other ends of the first and second idle segments 232, 233 are connected by a curve (not shown).

The distance sensor 24 may be a phase sensor, which should be a prior art, and the structure and operation principle thereof will not be described herein. The phase sensor is used for detecting the valve timing of the engine and is realized through detecting the position and the rotation angle of the cam shaft. The probe of the phase sensor is internally provided with a detection coil, so that the near metal can be sensed, when the near metal is not present, an LC loop comprising the probe is in a resonance state, and the output voltage U is maximum. When a metal object approaches the probe, eddy currents are induced on the surface of the metal object by the detection coil, so that inductance of the coil is changed, an LC parallel loop is detuned, and output voltage is reduced. The smaller the detection distance, the lower the output voltage, so that the change in phase can be detected. The output signals of the phase sensor can be magnetoelectric and Hall, the magnetoelectric phase sensor outputs sine waves, and the Hall phase sensor outputs square waves. It is known that whether sinusoidal or square wave, it comprises two directions, one in the oscillation direction and one in the forward direction. In the forward direction, the signal wave has an axis of symmetry which may be mathematically an X-axis to facilitate characterizing features of the sine wave or square wave such as wavelength, amplitude, etc. In the present application, the symmetry axis of the signal wave is perpendicular to the line connecting the axis of the driving shaft 22 and the pole of the archimedes spiral.

The circuit board 25 is arranged on a base (not shown) and is used for arranging the distance sensor 24, but is independent of the base plate 21, i.e. independent of the position of the base plate 21, i.e. the circuit board 25 is stationary when the base plate 21 is rotated by the drive shaft 22. It is conceivable that some other electronic components, such as diodes, triodes, etc., are not yet provided on the circuit board 25, which are known to those skilled in the art, and will not be described herein. In this embodiment, the driving shaft 22 is sleeved on a housing (not shown), and the circuit board 25 is fixed on the same housing.

The first and second limiting mechanisms 26 and 27 are used for preventing the signal wave sent by the distance sensor 24 from being emitted to other positions. The first and second limiting mechanisms 26 and 27 include first and second limiting plates 262 and 272 respectively fixedly disposed on the base, first and second limiting posts 261 and 271 respectively fixedly disposed on the base plate 21, and cushion pads 263 and 273 respectively disposed on the first and second limiting plates. The first and second limiting plates 262 and 272 may have any conventional plate-like structure. In this embodiment, the first and second limiting plates 262 and 272 are sidewalls of the base. The first and second limiting posts 261, 271 are two posts respectively fixed on two sides of the cam 23. In order to prevent the first and second stopper plates 262 and 272 from emitting sounds when they come into contact with the first and second stopper posts 261 and 271, first and second cushion pads 263 and 273 are provided on the first and second stopper plates 262 and 272. By the first and second stopper mechanisms 26 and 27, when the first stopper post 261 abuts against the first stopper plate 262, the distance between the distance sensor 24 and the sensing section 231 is closest. When the second limiting post 271 abuts the second limiting plate 272, the distance sensor 24 is farthest from the sensing section 231.

The dial 30 includes an end cap 31 provided on the outside of the housing 10, a dial gauge 32 provided on the end cap 31, and a pointer 33 provided on the drive shaft 22. The end cap 31 has a through hole 311, and the through hole 311 is used to pass through the driving shaft 22. The scale 32 is provided on the end cap 31, which may be provided by etching or may be printed onto the end cap 31 by printing, such as a silk screen technique. It is conceivable that the scale 32 is a series of numbers or graduations from small to large. The pointer 33 is sleeved on the driving shaft 22 and can rotate along with the driving shaft 22. By calibrating, the pointer 33 can be made to point to the minimum value of the scale 32 when the distance sensor 24 is closest to the sensing section 231. And the pointer 33 points to the maximum value of the scale 32 when the distance sensor 24 is farthest from the sensing section 231.

Compared with the prior art, the contour line of the cam 23 of the position sensing device 20 in the cross section perpendicular to the axial direction of the driving shaft comprises a sensing section 231, the sensing section 231 is an archimedes spiral, and the axle center of the driving shaft 22 is arranged offset from the pole of the archimedes spiral, so that when the cam 23 rotates along with the driving shaft 22 in a reciprocating way, the distance between the distance sensor 24 and the sensing section 231 only reciprocates between a maximum distance and a minimum distance. Second, since the cross-sectional profile line of the sensing section 231 is an archimedes spiral, the distance between the distance sensor 24 and the sensing section 231 changes linearly, which is beneficial to the stability of output. Finally, since the actuator has the dial 30, the current output size can be clearly known, making control easier.

The above is only a preferred embodiment of the present application and is not intended to limit the scope of the present application, and any modifications, equivalent substitutions or improvements within the spirit of the present application are intended to be covered by the claims of the present application.

Claims

1. A rotation position detects executor for gas engine ignition control which characterized in that: the rotary position detection actuator for ignition control of the gas engine comprises a shell, a position sensing device arranged in the shell and a dial arranged on the outer side of the shell, wherein the shell is provided with a shaft hole, the position sensing device comprises a base plate, a driving shaft fixedly arranged on the base plate, a cam sleeved on the driving shaft and a distance sensor which is arranged at intervals and is fixedly arranged with the cam, a profile line of the section of the cam in the axial direction perpendicular to the driving shaft comprises a sensing section, a first idle section arranged at one end of the sensing section, a second idle section arranged at the other end of the sensing section, the sensing section is an Archimedean spiral, the shaft center of the driving shaft is deviated from the starting point of the Archimedean spiral, the first idle section is a straight line, the distance sensor sends out a signal wave, the symmetrical shaft of the signal wave is perpendicular to the shaft center of the driving shaft and the starting point of the Archimedean spiral, the dial is arranged in the end cover, and the dial is arranged at the end of the end cover.

2. The rotational position detection actuator for ignition control of a gas engine according to claim 1, wherein: the position sensing device further comprises a circuit board fixedly arranged on the shell, and the distance sensor is arranged on the circuit board.

3. The rotational position detection actuator for ignition control of a gas engine according to claim 1, wherein: the position sensing device further comprises a first limiting mechanism and a second limiting mechanism which are respectively arranged on two sides of the cam, wherein the first limiting mechanism and the second limiting mechanism comprise a first limiting plate and a second limiting plate which are respectively fixedly arranged, and a first limiting column and a second limiting column which are respectively fixedly arranged on the base plate.

4. The rotational position detection actuator for ignition control of a gas engine according to claim 3, wherein: when the first limiting post is abutted to the first limiting plate, the distance between the distance sensor and the sensing section is nearest, and when the second limiting post is abutted to the second limiting plate, the distance between the distance sensor and the sensing section is farthest.

5. The rotational position detection actuator for ignition control of a gas engine according to claim 3, wherein: the first limiting plate and the second limiting plate are respectively provided with a buffer cushion.

6. The rotational position detection actuator for ignition control of a gas engine according to claim 4, wherein: when the distance between the distance sensor and the sensing section is nearest, the pointer points to the minimum value of the scale.

7. The rotational position detection actuator for ignition control of a gas engine according to claim 4, wherein: when the distance sensor is farthest from the sensing section, the pointer points to the maximum value of the scale.

8. The rotational position detection actuator for ignition control of a gas engine according to claim 1, wherein: the shell is a blind cylinder.

9. The rotational position detection actuator for ignition control of a gas engine according to claim 1, wherein: the signal wave is a sine wave.

10. The rotational position detection actuator for ignition control of a gas engine according to claim 1, wherein: the signal wave is a square wave.