KR20120055309A - Target wheel and method for sensing reverse rotation of engine using it - Google Patents

Target wheel and method for sensing reverse rotation of engine using it Download PDF

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Publication number
KR20120055309A
KR20120055309A KR1020100116984A KR20100116984A KR20120055309A KR 20120055309 A KR20120055309 A KR 20120055309A KR 1020100116984 A KR1020100116984 A KR 1020100116984A KR 20100116984 A KR20100116984 A KR 20100116984A KR 20120055309 A KR20120055309 A KR 20120055309A
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KR
South Korea
Prior art keywords
engine
target wheel
reverse rotation
position sensor
crank position
Prior art date
Application number
KR1020100116984A
Other languages
Korean (ko)
Inventor
김대우
Original Assignee
주식회사 케피코
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Publication date
Application filed by 주식회사 케피코 filed Critical 주식회사 케피코
Priority to KR1020100116984A priority Critical patent/KR20120055309A/en
Publication of KR20120055309A publication Critical patent/KR20120055309A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/06—Reverse rotation of engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The present invention relates to a target wheel and an engine reverse rotation sensing method using the same, wherein a forward rotation side surface of the target wheel 10 (11) is formed as an inclined surface (11a) so that a pulse in the crank position sensor detection waveform when the engine reverses is rotated. The slope between and the high point of the pulse is shown as (+).
Therefore, the engine reverse rotation state can be easily determined according to the detection waveform with only one crank position sensor.

Description

Target wheel and method for sensing reverse rotation of engine using it}

The present invention relates to a target wheel and an engine reverse rotation sensing method using the same, and to a target wheel capable of detecting reverse rotation of the engine using only one induction type sensor and an engine reverse rotation sensing method using the same.

The vehicle is traveling on a slope as well as on a flat surface. When the vehicle is restarted after a pause while driving on a slope (uphill), the vehicle may be pushed backward and the engine may be turned off.

As described above, when the engine reverse rotation occurs, air flows from the exhaust system and flows back to the intake system, and thus, the sensors installed in the intake system take a positive pressure and thus may be determined to have a failure despite being in a normal state.

In addition, although the engine is rotated in the reverse direction, fuel is injected, and the fuel is introduced into the intake system, and a back fire may occur, and the spark plug is wet or the mixing ratio is excessive, resulting in a difficult restart.

On the other hand, in order to control the fuel injection timing and the ignition timing of the engine, it is necessary to know the position of the engine rotation speed and top dead center, so that a plurality of teeth 11 on the outer circumferential surface of the engine crankshaft as shown in FIG. The target wheel 1 formed in the present invention is installed, and a crank position sensor 2 composed of an induction sensor, a hall sensor, and the like is installed adjacent thereto to detect the number of teeth (pulse number) detected within a predetermined time. The engine speed was measured by counting or measuring the time between specific pulses.

In addition, by removing one tooth from the circumference, the position is recognized as the top dead center position, but when the top dead center indicator of the two target wheels coincides by installing a target wheel (aka vandal cam) having one tooth (projection) on the cam shaft. It was determined that cylinder # 1 was in top dead center, and fuel injection and ignition control of all cylinders could be performed in a timely manner.

On the other hand, the crank position sensor (2) to detect the reverse rotation of the engine, but when the sensor (2) is an induction type sensor (induction type sensor), as shown in FIG. In the case of reverse rotation, only the same waveform is detected. Therefore, reverse rotation cannot be detected. When using a hall sensor as the crank position sensor 2, two Hall sensors are used to reverse the rotation of each sensor signal. Rotation could be detected, but in this case, two sensors had to be used, which increased the number of parts and the cost.

On the other hand, conventionally, when mounting the crank position sensor (2) by using a mechanical method to prevent the incorrect mounting (error in the mounting direction), nevertheless sometimes the wrong mounting occurs, especially in the engine of the development stage In many cases, misfitting occurs frequently.

If the crank position sensor 2 is incorrectly mounted as described above, an error occurs in information on the engine rotation speed or the top dead center position measured therefrom, so that proper fuel injection and ignition timing control cannot be made.

However, even when the crank position sensor 2 is incorrectly mounted as described above, there is no conventional method for detecting the same.

Accordingly, the present invention has been made to solve the above problems, it is possible to detect the reverse rotation of the engine only by one crank position sensor, eliminating the need to use two Hall sensors to reduce the number of parts and cost reduction In addition, an object of the present invention is to provide a target wheel and an engine reverse rotation sensing method using the same, which enables accurate fuel injection and ignition timing control by being able to easily detect a misfit of a sensor.

The target wheel according to the present invention for achieving the above object,

A plurality of teeth are formed on the outer circumferential surface at regular intervals,

This is characterized in that the shape of both sides is formed in a different asymmetric shape.

In addition, the one side cross-section thereof is formed as a straight line perpendicular to the tangent of the target wheel,

The other end of the cross-section is characterized in that formed in the inclined surface.

In addition, the inclined surface is characterized in that formed in a convex curved surface.

In addition, the inclined surface is characterized in that formed in a concave curved surface.

In addition, the inclined surface is the engine forward direction side surface,

The surface formed in a straight line perpendicular to the tangent of the target wheel is characterized in that the engine side in the reverse rotation direction.

On the other hand, the engine reverse rotation detection method according to the present invention,

The crank position sensor detects a target wheel formed on both sides with different asymmetric shapes,

If the slope between the pulse and the high point of the pulse in the detection waveform of the crank position sensor is positive, it is determined that the engine reverse rotation state.

In addition, if the detection waveform of the crank position sensor is maintained as the reverse rotation waveform for more than a predetermined crank position sensor mis-wear determination reference time, characterized in that it is determined that the crank position sensor is incorrectly mounted.

According to the present invention as described above,

Only one induction crank position sensor can detect reverse rotation of the engine, reducing component count and cost.

In addition, if it is determined that the engine is in the reverse rotation state, it is possible to stop fuel injection and ignition, and to disable the diagnostic function of each sensor, thereby preventing errors in sensor failure determination, preventing backfire, starting delay and starting It becomes possible to prevent it from becoming incapable.

In addition, the mounting error of the crank position sensor can be easily detected.

1 is a schematic diagram of a target wheel installed on a crankshaft and a sensor for detecting the same;
2 is a graph showing a detection waveform when the sensor of FIG. 1 is an induction sensor;
3 is an enlarged view of a target wheel according to the present invention and its tooth deployment state;
Figure 4 is a graph comparing the detection waveform of the induction sensor at the engine forward rotation (b) and reverse rotation (c) in preparation for the tooth (a) of the target wheel according to the present invention.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

The target wheel of the crankshaft is mounted inside the flywheel mainly outside the engine cylinder block and rotates integrally with the crankshaft.

The target wheel is formed of a plurality of teeth at regular intervals on the outer periphery of the metal plate, one of the plurality of teeth is removed to serve as a reference point (top dead center position).

As shown in FIG. 3, in the target wheel 10 according to the present invention, a plurality of teeth 11 are continuously formed on the outer circumferential surface at regular intervals, and the shape of both parts of the target wheel 10 is based on the width center. It is characterized by being formed in different asymmetrical shapes.

That is, the tooth 11 of the target wheel 10 according to the present invention is formed in a straight line along one side cross section along the radial direction.

In other words, one side cross-section of the tooth 11 is formed in a shape coinciding with a line perpendicular to the tangent of the outer circumferential surface of the target wheel 10.

On the other hand, the other end surface of the tooth 11 is characterized in that formed in the inclined surface (11a).

The inclined surface 11a is one surface formed continuously from the upper end to the lower end of the tooth 11 and throughout the other end surface of the tooth 11.

The inclined surface 11a may be formed in a plane as shown, or the middle portion may be formed in a concave shape or a convex shape with respect to the plane.

The shape of the inclined surface 11a as described above may help to identify the forward or reverse rotation more easily by making the shape of the detection waveform of the crank position sensor different.

Now, with reference to Figure 4 will be described the effect of the operation of the target wheel 10 and the engine reverse rotation detection method using the target wheel 10 according to the present invention.

4 (a) is an exploded view of the outer circumferential surface of the target wheel 10, it is possible to more easily recognize the continuous shape change of the tooth 11 according to the present invention.

4 (b) and (c) show the detection waveform of the crank position sensor according to the tooth shape change of the tooth 11 shown in the above (a), and shows the crank according to the shape change of the tooth (11). It is easy to see how the position change of the detection waveform changes.

The crank position sensor generates a positive voltage when the tooth 11 approaches, and a negative voltage when the tooth 11 moves away.

Therefore, when the engine is normally operated as shown in (b) and the target wheel 10 is rotated in the forward direction, a section cut by the formation of the inclined surface 11a exists so that the crank position sensor generates a positive voltage. Becomes shorter, and since the vertical section of the tooth 11 passes, it takes a relatively long time to approach the upper end of the tooth 11 next, so that the generated voltage decreases and the interval for generating a negative value becomes long. .

That is, in the forward rotation, the slope of the gentle slope section a between the pulse and the high point of the pulse has a negative value.

Therefore, when the waveform slope between the pulse and the high point of the pulse (section (a)) is negative in the detected waveform of the crank position sensor, it is determined that the engine is running forward.

Of course, the determination is made in a computer that controls the driving state of the engine, that is, an engine control unit (ECU) mounted in the vehicle. At this time, since the signal generated by the crank position sensor is an analog signal, it is converted into a digital signal through an analog / digital converter (A / D converter) and then input into the engine control unit before being transmitted to the engine control unit.

On the other hand, as shown in (c), when the engine is rotated in reverse and the target wheel 10 is rotated in the reverse direction, the output value of the crank position sensor has a positive value due to the entry of the vertical end thereof, and then the inclined surface ( 11a) As the section approaches, the output value drops sharply to a negative value, and then the time passes until the vertical end of the next segment (11) approaches again through a long section where the body of this (11) does not exist. Because it takes a long time, the waveform of the interval (b) has a gentle (+) slope.

That is, in the reverse rotation, the slope of the gentle slope section b between the pulse and the high point of the pulse has a positive value.

Therefore, when the waveform slope between the pulse and the high point of the pulse (section (b)) in the detection waveform of the crank position sensor is positive, it is determined that the engine is in the reverse rotation state.

That is, the method for detecting the engine reverse rotation using the target wheel according to the present invention is characterized in that the engine is in the reverse rotation state when the slope between the pulse and the high point of the pulse in the detection waveform of the crank position sensor is positive. do.

As described above, by using the target wheel according to the present invention, it is possible to easily detect reverse rotation of the engine with only one induction type crank position sensor.

Therefore, since there is no need to use two Hall sensors as in the prior art, the number of parts is reduced and thus the required cost is reduced.

On the other hand, if it is determined that the engine is in the reverse rotation state according to the present invention, the engine control unit immediately stops fuel injection and ignition, and disables the diagnostic function of each sensor to prevent the transmission of false data from the sensor, Prevents a false positive that is considered to be faulty.

Therefore, the sensor error does not occur even if the engine is temporarily rotated reversely so that a reverse flow from the exhaust system to the intake system occurs.

In addition, backfire is prevented by stopping fuel injection and ignition, and preventing the spark plug from becoming wet to prevent starting.

In addition, since the fuel does not flow into the intake system, the fuel cost becomes excessively rich at the time of subsequent restarts, and the phenomenon that starting is difficult to be solved is also eliminated.

On the other hand, if the detection waveform of the crank position sensor is continuously detected in the reverse rotation state despite the normal operation of the engine, it can be determined that the crank position sensor is incorrectly mounted in the opposite direction.

For example, if the crank position sensor misfit determination reference time is set, and the detection of the reverse rotation waveform is maintained for more than the set time (for example, about 10 seconds), the crank position sensor is judged to be incorrectly mounted. .

According to the present invention as described above it is possible to easily detect the mounting error of the crank position sensor.

10: target wheel 11: tooth
11a: slope

Claims (7)

A plurality of teeth are formed on the outer circumferential surface at regular intervals,
The target wheel, characterized in that formed in asymmetrical shapes different from both sides. The method according to claim 1,
One side of the cross section is formed in a straight line perpendicular to the tangent of the target wheel,
The other side thereof is a target wheel, characterized in that formed in the inclined surface. The method according to claim 2,
Target wheel, characterized in that the inclined surface is formed of a convex curved surface. The method according to claim 2,
The inclined surface is a target wheel, characterized in that formed in a concave curved surface. The method according to claim 2,
The inclined surface is the engine forward direction side,
The surface formed by a straight line perpendicular to the tangent of the target wheel is a target wheel, characterized in that the surface in the reverse direction of the engine. The crank position sensor detects a target wheel formed on both sides with different asymmetric shapes,
If the slope between the pulse and the high point of the pulse in the detection waveform of the crank position sensor is positive, determining that the engine is in reverse rotation state
Engine reverse rotation detection method characterized in that. The method of claim 6,
Determining that the crank position sensor is incorrectly mounted if the detected waveform of the crank position sensor is maintained as a reverse rotation waveform for more than a predetermined crank position sensor misfit determination reference time.
Engine reverse rotation detection method characterized in that.
KR1020100116984A 2010-11-23 2010-11-23 Target wheel and method for sensing reverse rotation of engine using it KR20120055309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100116984A KR20120055309A (en) 2010-11-23 2010-11-23 Target wheel and method for sensing reverse rotation of engine using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100116984A KR20120055309A (en) 2010-11-23 2010-11-23 Target wheel and method for sensing reverse rotation of engine using it

Publications (1)

Publication Number Publication Date
KR20120055309A true KR20120055309A (en) 2012-05-31

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Application Number Title Priority Date Filing Date
KR1020100116984A KR20120055309A (en) 2010-11-23 2010-11-23 Target wheel and method for sensing reverse rotation of engine using it

Country Status (1)

Country Link
KR (1) KR20120055309A (en)

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