JPH11229946A - Cylinder determination device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform cylinder determination in an early stage regardless to the stopping position of an engine so as to improve an engine starting characteristic by arranging circular arc type projections for detecting in a cylinder determining rotor. SOLUTION: A rotary plate 7 in a cylinder determination device 6 is arranged in a cam shaft 3 of an engine, and the upper part of the rotary plate 7 is divided into four detection areas corresponding to respective cylinders 1A in an engine main body 1 by means of circular arc type projections 8, 9, 10. When a power source is turned on in an engine starting time, a signal output device 11 detects whether the circular arc type projections 8, 9, 10 are positioned under the signal device 11 or not so as to recognize the detection area corresponding to the stopping position of the engine from the respective detection areas according to the combination of the circular arc projections. In this way, a control unit 15 can perform cylinder determination even when a crank shaft 2 is stopped in an engine starting time, so that the engine can be started in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cylinder discriminating apparatus suitably used for discriminating a cylinder of, for example, an automobile engine. A cylinder discriminating apparatus.

[0002]

2. Description of the Related Art Generally, in a multi-cylinder engine such as an automobile engine, when the crankshaft of the engine rotates, each cylinder reaches a position near the top dead center at a different rotation position of the crankshaft. Among them, the cylinder which has reached the vicinity of the top dead center is detected by the cylinder discriminating device, and a cylinder detection signal corresponding to this cylinder is output to a control unit for engine control and the like.

A prior art engine cylinder discriminating device in a prototype stage will be described with reference to FIG. 9 by taking a four-cylinder engine as an example.

First, in FIG. 9, characteristics from the stop state to the start of the engine are shown as a relationship among a cylinder detection signal, a position signal, an injection signal, and a start signal with respect to a crankshaft angle (crank angle). In addition, since the engine is normally likely to stop at a position 90 ° before and after the top dead center, the engine is stopped at a position P1 80 ° before the top dead center during the previous operation according to the characteristic line in FIG. The case where the engine is started from the position P1 is illustrated.

When a start signal is output to a starter of the engine to start the engine, for example, the fourth cylinder
The cylinder reaches the top dead center at the position # 4, the second cylinder reaches the top dead center at the next position # 2, and the first and third cylinders sequentially reach the top dead center at the positions # 1 and # 3. Shall be reached. Thereafter, the cylinders again reach the top dead center position in order of # 4, # 2, # 1, and # 3 for performing fuel injection control and the like.

The cylinder detection signal is a signal output from a cylinder discriminating device provided on the camshaft side of the engine. The cylinder discriminating device is rotated by the camshaft side of the engine, and corresponds to each cylinder of the engine. It is composed of a metal rotator provided with four detected parts, an electromagnetic pickup-type rotation sensor provided near the rotator, and the like.

For example, at the position of # 4, the detected portion for the fourth cylinder provided on the rotating body passes through the position of the rotation sensor, so that the rotation sensor outputs a cylinder detection signal of four pulses, It is determined that the fourth cylinder has reached the top dead center. Similarly, at the next position ♯2, the second
In order to determine that the cylinder has reached the top dead center, a cylinder detection signal is output as a two-pulse signal. further,
At the next positions # 1 and # 3, the cylinder detection signals are 1 respectively.
The signal is output as a pulse signal or a three-pulse signal, whereby it can be determined that the first and third cylinders have reached the top dead center.

Here, the cylinder detection signal is set so that the falling position of the leading pulse is always at a position 60 ° before the top dead center, and the interval between each pulse is set to, for example, 30 °.

A crank angle sensor for detecting a rotational position of the engine as a crank angle and outputting a position signal is provided on the crank shaft side of the engine, and the position signal is output as an angle signal for every 10 °, for example. . The position signal is output, for example, as an angle signal for every 10 °. At the position 60 ° before and after the top dead center of each cylinder, for example, a notch of about 20 ° is interposed in the middle of the position signal. .
This notch absorbs variations between the camshaft-side cylinder detection signal and the crankshaft-side position signal, and detects the first position signal after the head pulse of the cylinder detection signal is output as a reference signal. belongs to.

In the prior art, when a so-called sequential injection is performed for each cylinder of the engine as an injection signal I in FIG. 9, an injection signal is output based on the first position signal after the notch. For example, the fuel injection by the injection signal is performed on the first cylinder reaching the top dead center at the position of # 1. Thereafter, in this cylinder, a suction stroke and a compression stroke are performed, and an ignition signal is output at a position P2 before the compression stroke ends. Then, the engine is started by the ignition signal.

[0011]

In the prior art described above, the position signal on the crankshaft side is output as an angle signal at every 10 °, and the cylinder detection signal is such that the falling position of the leading pulse is 60 degrees before the top dead center. ° position,
Since the interval between each pulse is set to about 30 °,
In order to perform cylinder discrimination based on the number of pulses of the cylinder detection signal, it is necessary to identify the top pulse located 60 ° before the top dead center (for example, the top dead center position of # 4). In order to do so, it must be possible to confirm that no pulse of the cylinder detection signal has been output during at least the output of the position signal of 5 pulses.

That is, the pulse interval of the cylinder detection signal is 30 °
During this period, there is a possibility that a position signal corresponding to a maximum of 4 pulses is output. Therefore, from the state where there is no pulse output of the cylinder detection signal for 50 ° of the crank angle (5 pulses of the position signal), Must be detected as the first pulse of the cylinder detection signal, and cylinder discrimination must be performed based on the number of pulses from the first pulse.

However, when the engine is normally stopped, an intermediate portion between the top dead center and the bottom dead center of each cylinder, for example, 90 ° before the top dead center is reached.
It often stops before and after. When the engine is started from the stop position (for example, the position P1 at 80 ° before the top dead center of # 4), the angle up to 60 ° before the top dead center at which the top pulse of the cylinder of # 4 is output is set. Since it is only about 20 °, the first pulse cannot be determined at the position of # 4 by identifying the leading pulse during this period, and the first cylinder is determined at the next position of # 2.

For this reason, in the prior art, when performing sequential injection, after performing the first cylinder discrimination at the position of # 2, the injection control is performed for the first time in a state where the fuel injection timing is calculated at the next position of # 1. The ignition control at the time of starting the engine is delayed by two crankshaft revolutions (720 °) to the fifth cylinder (position # 4) after the start of the engine. There is an unsolved problem that makes it difficult to start with.

On the other hand, even in the case of an engine of the type in which simultaneous injection is performed separately from sequential injection, the injection signal shown in FIG.
As shown as II, when the engine is started from the stop position (the position P1 at 80 ° before the top dead center of # 4), the first pulse cannot be detected at the position of # 4 which is the first top dead center. The first injection control becomes possible after detecting the leading pulse of the cylinder detection signal at a position 60 ° before the next top dead center position of # 2, and the subsequent ignition control is performed at the position P3 before top dead center of # 3. There is a problem that is delayed until.

The present invention has been made in view of the above-mentioned problems of the prior art,
The present invention has been made by intensive studies, and an object of the present invention is to provide an engine cylinder discriminating apparatus that can perform cylinder discrimination at the time of starting an engine at an early stage and can start the engine in a short time. I have.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-described problems, the present invention is directed to an engine which is rotated by an output shaft.
A rotating body provided with a plurality of detected parts corresponding to each cylinder of the engine; and a signal output provided near the rotating body and outputting a cylinder detection signal corresponding to each detected part of the rotating body. The present invention is applied to an engine cylinder discriminating device comprising:

A feature adopted by the invention of claim 1 is that each detected portion of the rotating body is composed of a plurality of detected areas formed on the rotating body corresponding to the number of cylinders of the engine, Each of the detection areas extends along the rotation direction of the rotating body, and has a configuration different from each other.

With such a configuration, the region over the entire circumference of the rotating body in the rotational direction can be divided into a plurality of detected regions, and the signal output means can output different cylinder detection signals for each of the detected regions. . The cylinder detection signal is output as the same cylinder detection signal until the rotation position of the rotating body is switched from one detected area to another detected area, and thereby the rotating position of the rotating body It can be divided into regions and detected. Accordingly, the signal output unit can output the cylinder detection signal of the detection area corresponding to the rotational position when the signal output unit faces the rotary body at an arbitrary rotational position.

According to the second aspect of the present invention, each of the detected areas is constituted by combining a plurality of arc-shaped projections extending in a circumferential direction of the rotating body, and the signal output means is provided with each of the arc-shaped projections. And a plurality of rotation detectors corresponding to the above-described configurations, and output different cylinder detection signals for each of the detection target regions by detecting the presence or absence of each of the arc-shaped protrusions.

Thus, for example, the arc-shaped projections can be arranged at different positions on the rotating body, and the combination of the presence or absence of these projections can be different for each detection area of the rotating body. Each rotation detection unit of the signal output means detects the presence or absence of each arc-shaped projection, identifies each detected area using the combination, and determines the rotation position of the rotating body in any area. Can be determined.

Further, in the invention of claim 3, the rotating body comprises a rotating plate provided with first and second arc-shaped projections spaced apart in a radial direction.
Four detection regions are provided in which the first and second arc-shaped protrusions extend in different combinations.

Thus, on the rotating plate, for example, a region where both the first and second arc-shaped protrusions are present or a region where neither is present is disposed as the first and second detected regions. Since the area where only one of the arc-shaped projections exists can be disposed as the third and fourth detection areas,
The signal output means can identify the four detection areas from each other by detecting the presence or absence of each arc-shaped projection.

Further, in the invention of claim 4, the rotating body comprises a rotating plate provided with first, second and third arc-shaped projections spaced apart in a radial direction. Six detection areas are provided in which the first, second, and third arc-shaped projections extend in different combinations.

Thus, on the rotating plate, for example, an area where only one of the first to third arc-shaped projections exists is disposed as the first to third detection areas,
Since an area where only one of the arc-shaped projections does not exist can be disposed as the fourth to sixth detection areas,
The signal output means can identify the six detection areas from each other by detecting the presence or absence of each arc-shaped projection.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an engine cylinder discriminating apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.

FIGS. 1 to 5 show a first embodiment of the present invention. In this embodiment, a cylinder discriminating apparatus used in a four-cylinder engine for an automobile will be described as an example.

Reference numeral 1 denotes an engine main body constituting a four-cylinder engine. Each cylinder 1A of the engine main body 1 has a fuel injection valve and a spark plug (neither shown) which are driven and controlled by a control unit 15 described later. Each is provided. Further, the engine body 1 is provided with a crankshaft 2 serving as an output shaft, and a camshaft 3 connected to the crankshaft 2 and making one rotation while the crankshaft 2 makes two rotations.

Reference numeral 4 denotes a starter composed of an electric motor or the like. The starter 4 outputs a start signal shown in FIG. 5 when the driver operates a start switch (not shown) of the vehicle when the engine is started. Thus, the crankshaft 2 is driven to rotate to start (crank) the engine.

Reference numeral 5 denotes a crank angle sensor provided near the crankshaft 2. The crank angle sensor 5 outputs a position signal at every 10 ° shown in FIG. Is what you do.

Reference numeral 6 denotes an engine cylinder discriminating apparatus according to this embodiment. The cylinder discriminating apparatus 6 includes a rotating plate 7 described later.
When each of the cylinders 1A of the engine body 1 has reached the vicinity of the top dead center before the intake stroke, the cylinder detection signals S1 and S2 (see FIG. 5) are output to the control unit 15 as described later. Is what you do.

Reference numeral 7 denotes a rotating plate as a rotating body provided integrally with the camshaft 3. The rotating plate 7 is a disk having a center O made of a magnetic material such as metal as shown in FIGS. The camshaft 3 has an insertion hole 7A at the center thereof. And the rotating plate 7
Is configured to rotate together with the camshaft 3 in the direction of arrow A in FIG. 4 when the crankshaft 2 rotates.

Reference numeral 8 denotes a first arc-shaped projection formed on the rotating plate 7, and the first arc-shaped projection 8 is disposed on a circumference C1 having a center O similar to that of the rotating plate 7. About 1
It extends in a semicircular shape at an angle of 80 °. Further, the arc-shaped projection 8 projects axially from the rotating plate 7 with a predetermined height dimension.

Reference numerals 9 and 10 denote second arc-shaped projections formed on the rotating plate 7, and the second arc-shaped projections 9 and 10 are
It is provided on a circumference C2 which is spaced radially inward of the circumference C1 and concentrically disposed therewith, extends in the circumferential direction at an angle of about 90 °, and has almost the same height as the arc-shaped projection 8. And protrudes from the rotating plate 7 in the axial direction.
One of the arc-shaped projections 9 is one of the arc-shaped projections 8 shown in FIG.
The other arc-shaped projection 10 is provided at a circumferential position corresponding to the middle right half, and is provided at a position radially opposed to the arc-shaped projection 9 across the center O of the rotating plate 7.

As a result, a straight line X1-passing through both ends of the arc-shaped projection 8 with the center O interposed therebetween is provided on the rotating plate 7.
X2 and a straight line Y1-Y2 orthogonal to the straight line X1-X2 and passing through the end portions of the arc-shaped projections 9, 10
The detection areas θ1, θ2, θ3, and θ4 are defined. The detected areas .theta.1 to .theta.4 are
4 formed by dividing the entire region in the rotation direction of the engine by 90 ° corresponding to the first to fourth cylinders of the engine.
This constitutes the number of detected parts.

Here, the boundary line OY1 between the detected areas θ1 and θ3 is defined by the crank angle with respect to the top dead center (the position of # 4 shown in FIG. 5) at which the fourth cylinder of the engine starts the intake stroke. It is disposed on the near side in the rotation direction (direction of arrow A in FIG. 4) by an angle α, and this angle α is set to, for example, about 60 °. Also, a boundary line O- between the detected areas θ3 and θ4
Similarly, X1 is disposed on the near side in the rotation direction by an angle α with respect to the top dead center (the position of # 2) of the second cylinder. Further, a boundary line OY2 between the detected areas θ4 and θ2 and a boundary line OX2 between the detected areas θ2 and θ1 are also the first.
The cylinder and the third cylinder are disposed on the near side in the rotation direction by an angle α with respect to the top dead center (the positions of # 1 and # 3).

The detected areas θ1 to θ4 have the first
And the second arc-shaped projections 9 and 10 exist in different combinations, and the detected areas θ1 to θ
The shapes of 4 are different from each other. That is,
A first arc-shaped projection 8 and a second arc-shaped projection 9 extend in the circumferential direction in the detection area θ1, and the detection area θ2 is a flat surface on which none of the arc-shaped projections 8, 9, 10 exists. It is formed as. In the detected area θ3, only the first arc-shaped projection 8 is provided extending in the circumferential direction.
Is provided with only the second arc-shaped projection 10 extending in the circumferential direction.

Numeral 11 denotes a signal output device as signal output means fixedly provided in the vicinity of the rotary plate 7. The signal output device 11 is a sensor case extending in the radial direction of the rotary plate 7 as shown in FIG. 12 and the first arc-shaped projection 8
And a second rotation detecting unit 14 provided in the sensor case 12 corresponding to the second arc-shaped projections 9 and 10.
The rotation detectors 13 and 14 are provided on the rotation plate 7.
Are arranged with a predetermined axial gap between them and the front side.

Here, the rotation detecting section 13 comprises a magnet 13A embedded in the sensor case 12, a Hall element 13B disposed between the magnet 13A and the rotating plate 7, and the like. Then, the rotation detection unit 1
3 magnetically detects the presence or absence of the arc-shaped projection 8 corresponding to the rotation position of the rotating plate 7 by the Hall element 13B;
A first cylinder detection signal S1 corresponding to the detection result is output to the control unit 15 via an output circuit (not shown) or the like.

In this case, the output value of the cylinder detection signal S1 is
During the period in which the arc-shaped projection 8 of the rotating plate 7 faces the rotation detecting unit 13, it becomes “high level” as shown in FIG.
When the arc-shaped projection 8 is separated from the rotation detection unit 13 and is not opposed to the rotation detection unit 13, the state is switched to “low level”.

The rotation detector 14 is also provided with the rotation detector 13.
In the same manner as described above, the second cylinder detection signal S2 corresponding to the presence or absence of the arc-shaped projections 9 and 10 is output to the control unit 15 which comprises a magnet 14A, a Hall element 14B and the like. The output value of the cylinder detection signal S2 becomes "high level" while one of the arc-shaped projections 9 and 10 faces the rotation detecting unit 14, and both of the arc-shaped projections 9 and 10 detect the rotation. When it is separated from the unit 14 and does not face, the state is switched to “low level”.

Reference numeral 15 denotes a control unit for controlling the engine provided in the vehicle.
As shown in FIG. 1, a crank angle sensor 5, a cylinder discriminating device 6, and the like are connected to an input side, and a fuel injection valve, a spark plug, and the like of each cylinder 1A of the engine body 1 are connected to an output side.

The control unit 15 has a storage unit 15A in which data for cylinder discrimination shown in the following table is stored in advance, and this data, the cylinder detection signals S1 and S2 from the cylinder discrimination device 6, and Is used to determine which of the first to fourth cylinders of the engine has reached the vicinity of top dead center before the intake stroke.

[0044]

[Table 1]

The control unit 15 outputs, for example, an injection signal shown in FIG. 5 to the fuel injection valve of the cylinder determined to be in the vicinity of the top dead center, and then ignites the cylinder at the position P4 in the latter half of the compression stroke. An ignition signal is output to the plug, and these fuel injection control and ignition control are repeated for the first to fourth cylinders of the engine.

The operation of the engine cylinder discriminating apparatus 6 according to this embodiment having the above-described configuration will be described below with reference to FIG.

Here, in FIG. 5, the characteristics from the stop state to the start of the engine are shown as a relationship among the cylinder detection signals S1, S2, the position signal, the injection signal, and the start signal with respect to the crank angle. At positions # 4, # 2, # 1, and # 3, the fourth, second, first, and third cylinders of the engine reach the top dead center before the intake stroke, respectively, as the crankshaft 2 rotates. . Also, in FIG. 5, the engine (crankshaft 2) is operated at the time before the top dead center of the fourth cylinder during the previous operation.
The case where the engine is stopped at the position P1 of the angle and the engine is started from the position P1 is illustrated.

When the driver or the like turns on the ignition key of the vehicle and turns on the power to the cylinder discriminating device 6, the crank angle sensor 5, the control unit 15 and the like, the cylinder discriminating device 6 sets the rotational position of the rotary plate 7 Are output to the control unit 15 corresponding to the cylinder detection signals S1 and S2. In this case, since the rotary plate 7 is at a rotational position shown by a two-dot chain line in FIG. 4 with respect to the signal output device 11, the signal output device 11 Is detected, and both of the cylinder detection signals S1 and S2 are output as "high level".

Thus, the control unit 15
Performs cylinder discrimination by referring to the data in Table 1 using the cylinder detection signals S1 and S2 from the signal output device 11, and the first time the engine reaches the top dead center when the engine is started from the position P1. It is detected that the cylinder is the fourth cylinder.

Next, when the driver or the like outputs a start signal to the starter 4 to start the engine, the crankshaft 2 is driven to rotate, so that the rotating plate 7 and the camshaft 3 together with the camshaft 3 are indicated by arrows in FIG. It rotates in the A direction. Then, when the crankshaft 2 rotates to a position closer to the top dead center # 4 of the fourth cylinder than the angle α, the rotating plate 7 in FIG. 4 shows the boundary line O-Y1 between the detection areas θ1 and θ3. Signal output device 11
Is rotated in the direction indicated by the arrow A to a position beyond the position.

As a result, the signal output device 11 detects only the arc-shaped protrusion 8 in the detected area θ3 of the rotary plate 7, and sets the cylinder detection signal S1 to “high level” and the cylinder detection signal S2 to “low”. It is output to the control unit 15 as "level". On the other hand, when the crankshaft 2 rotates, the crank angle sensor 5 outputs a position signal for every 10 ° to the control unit 15.

As a result, the control unit 15
Cylinder detection signals S1, S output from the signal output device 11
The cylinder is discriminated based on the data shown in Table 1 by using 2, and it is detected that the cylinder reaching the top dead center is the second cylinder. Further, the control unit 15 detects that the rotational position of the crankshaft 2 has reached the angle α before the top dead center due to the change in the output value of the cylinder detection signal S2. The first position signal output from the fuel injection valve 5 is used as a reference signal S0 to output an injection signal to the fuel injection valve of the fourth cylinder and a predetermined position in the second half of the compression stroke of the ignition plug of the fourth cylinder. P
4 outputs the ignition signal.

In the middle of the position signal, a notch with an angle β (for example, about 20 °) is provided corresponding to the switching position of the cylinder detection signals S 1 and S 2. This is to absorb a variation in the relative position between the cylinder detection signals S1, S2 and the position signal on the crankshaft 2 side, and to accurately detect the position signal serving as the reference signal S0.

The signal output device 11 is connected to the crankshaft 2.
Is further rotated, the detected area θ4 of the rotating plate 7 is
After detecting only the arc-shaped projection 10 in the detection area θ2
Does not detect any one of the arc-shaped projections 8, 9, and 10, the control unit 15 similarly performs cylinder discrimination using the cylinder detection signals S1 and S2 in these cases.
It is detected that the cylinders reaching the top dead center are the first cylinder and the third cylinder, respectively.

When the cylinders of the second, first, and third cylinders are determined, the first position signal output after the switching of the cylinder detection signals S1 and S2 is used as the reference signal, as in the case of the fourth cylinder. As S0, fuel injection control and ignition control of each cylinder are performed, and these controls are repeated in the order of # 4, # 2, # 1, and # 3 for each cylinder together with the cylinder discrimination, whereby the engine is started. You.

Thus, in this embodiment, the first and second arc-shaped projections 8 to 10 are provided on the rotating plate 7, and the entire area of the rotating plate 7 is controlled by the arc-shaped projections 8 to 10. Four detected areas θ1 to 4 corresponding to the number of cylinders
Since the engine is divided into θ4, the cylinder of the engine can be immediately discriminated by the cylinder discriminating device 6 when the power is supplied to the control unit 15 or the like at the time of starting the engine.

Thus, even before the crankshaft 2 is rotationally driven by the starter 4, the cylinder which reaches the top dead center first after the engine is started can be reliably determined among the cylinders. Fuel injection control, ignition control, and the like can be started early, and the engine can be started in a short time.

Accordingly, in a vehicle having an idle stop control for temporarily stopping the engine when the vehicle is in an idling operation state, or a specification in which the drive source is switched between an electric motor and a gasoline engine in accordance with the operation state of the vehicle. Thus, the startability of the engine can be reliably improved.

The first and second arc-shaped projections 8 to 10
Are extended in the entire circumferential direction within the detection areas θ1 to θ4 where they exist, so that they face the position of the signal output device 11 in the detection areas θ1 to θ4 regardless of the rotational position of the crankshaft 2. The detected area can be accurately detected, and the cylinder discrimination of the four-cylinder engine can be reliably performed.

In this case, the first and second arc-shaped projections 8 to 1
0 extends in the detected areas .theta.1 to .theta.4 with different combinations, so that the signal output device 11 has two rotation detectors 13, 1 smaller than the number of cylinders of the engine.
4, the combination of the cylinder detection signals S1 and S2 output from the rotation detectors 13 and 14 causes
Each of the detected areas θ1 to θ4 can be clearly discriminated,
The cylinder discriminating device 6 can be simplified and the number of parts can be reduced.

Further, since the switching position of the detected areas θ1 to θ4 (cylinder detection signals S1, S2) is set to about 60 ° before the top dead center of each cylinder, each cylinder in which the four-cylinder engine is in the normal stop position is set. When the engine is started 90 degrees before and after TDC, the output values of the cylinder detection signals S1 and S2 can be changed from when the engine is started until the first cylinder reaches TDC.

As a result, since the reference signal S0 of the position signals output from the crank angle sensor 5 can be detected before the first cylinder reaches the top dead center, fuel injection control, ignition control, etc. for the first cylinder can be performed. Can be accurately performed using the reference signal S0.

Further, the signal output device 11 has a structure in which the two rotation detecting portions 13 and 14 are integrally provided in the sensor case 12, so that the entire device can be formed compactly and its size can be reduced. Can be.

Next, FIG. 6 shows a second embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be given. It shall be omitted. However, a feature of the engine cylinder discriminating apparatus 21 according to the present embodiment is that the cylinder discriminating apparatus 21 is configured to discriminate the cylinder of the six-cylinder engine.

Here, the cylinder discriminating device 21 is substantially the same as the cylinder discriminating device 6 according to the first embodiment, and includes a rotary plate 22 that rotates in the direction of arrow A together with the camshaft 3 and a signal detecting device 28 described later. It is composed of However, on the rotating plate 22, the first arc-shaped projection 23, the second arc-shaped projections 24 and 25, and the third arc-shaped projections 26 and 27
Are provided at different positions in the radial direction from each other, and the arc-shaped projections 23 to 27 are arranged concentrically with respect to the center O of the rotating plate 22, and have a predetermined height from the rotating plate 22. Projecting in the direction.

Then, the first arc-shaped projections 23 are approximately 18
It extends in a semicircular shape at an angle of 0 °. Also, the second
Of the arc-shaped projections 24 and 25 extend on the same circumference at an angle of about 120 °, and one of the arc-shaped projections 24 is
3, and the other arc-shaped projection 25 is provided at a position radially opposed to the arc-shaped projection 24 with the center O of the rotating plate 22 interposed therebetween. Have been.

Further, the third arc-shaped projections 26 and 27 extend on the same circumference at an angle of about 60 °, and one of the arc-shaped projections 26 has a circumference corresponding to a half of the arc-shaped projection 24. And the other arc-shaped projection 2
7 is an arc-shaped projection 26 sandwiching the center O of the rotating plate 22.
Is provided at a position radially opposed to the main body.

Thus, three straight lines L 1 -L passing through the end portions of the arc-shaped projections 23 to 27 are formed on the rotating plate 22.
2, six detected areas .theta.1 ', .theta.2', .theta.3 ', .theta.4', .theta.5 ', .theta. By lines L3 -L4 and L5 -L6.
6 'is defined, and the detected areas .theta.1' to .theta.6 'are obtained by dividing the entire area of the rotating plate 22 in the rotational direction by 60.degree. Corresponding to the first to sixth cylinders of the engine. It is configured.

The straight lines L1-L2, L3-L4, and L5-L, which are the boundaries between the detection areas θ1 'to θ6'.
L6 is disposed on the front side in the rotational direction (direction A shown by an arrow in FIG. 6) by a crank angle of an angle δ with respect to the top dead center of each cylinder, and the angle δ is set to, for example, about 40 °. I have.

The detected areas θ1 ′ to θ6 ′ include:
A first arc-shaped projection 23 and second arc-shaped projections 24 and 25
And the third arc-shaped projections 26 and 27 extend in different combinations, so that the combination of the output values of the cylinder detection signals S3, S4 and S5 output from the signal output device 28 described later is As will be described later, the detected areas θ1 ′ to θ1
Each 6 'is configured to be different from each other.

On the other hand, although the signal output device 28 is configured almost in the same manner as the signal output device 11 according to the first embodiment, in the present embodiment, three rotation detection units 29,
30 and 31 are provided. Then, the rotation detection unit 29
Arc-shaped projection 23 corresponding to the rotation position of rotation plate 22
Is magnetically detected, and a cylinder detection signal S3 corresponding to the detection result is output. Similarly, the rotation detector 30 outputs a cylinder detection signal S4 corresponding to the presence or absence of the arc-shaped projections 24 and 25. Further, the rotation detecting section 31 also outputs a cylinder detection signal S5 corresponding to the presence or absence of the arc-shaped projections 26 and 27.

As a result, these cylinder detection signals S3, S
4 and S5, the output values when the arc-shaped projections 23 to 27 are present in the detection area are "high level", and the output values when the arc projections 23 to 27 are not present are "low level".
'Are output as shown in the following table.

[0073]

[Table 2]

The control unit includes the cylinder discrimination data shown in Table 2 previously stored therein and the cylinder discrimination device 21 in substantially the same manner as in the first embodiment.
By using the cylinder detection signals S3, S4, and S5, the cylinders that have reached the vicinity of the top dead center before the intake stroke among the first to sixth cylinders of the engine are determined.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as in the first embodiment can be obtained, and the cylinder discrimination can be performed early at the start of the six-cylinder engine. It is possible to surely improve the startability. Further, by merely providing the three rotation detectors 29, 30, and 31 in the signal output device 11, the cylinder detection signals S3 to S output from these rotation detectors 29 to 31 are provided.
By the combination of 5, each of the six detection areas .theta.1 'to .theta.6' can be identified.

In the present embodiment, the switching position of the detected areas .theta.1 'to .theta.6' (cylinder detection signals S3 to S5) is set to about 40.degree. Before the top dead center of each cylinder. Before the top dead center of each cylinder where is the normal stop position
When the engine is started 0 ° before or after 0 °, the output values of the cylinder detection signals S3 to S5 can be changed before the first cylinder reaches the top dead center after the engine is started. As a result, even in the case of the six-cylinder engine, similarly to the case of the four-cylinder engine according to the first embodiment, fuel injection control, ignition control, and the like for the first cylinder can be accurately performed.

Next, FIGS. 7 and 8 show a third embodiment according to the present invention.
In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. However, the feature of the engine cylinder discriminating device 41 according to the present embodiment is that the rotating plate 4
The first arc-shaped projection 43 provided on the outer peripheral side projection 43A
And an inner peripheral projection 43B, and the second arc-shaped projection 4
4 are also outer-side protrusions 44A, 44A and inner-side protrusions 44B, 4B.
4B.

Here, the outer peripheral side projection 43 of the arc-shaped projection 43
A has substantially the same configuration as the arc-shaped projections 8 according to the first embodiment, and the outer peripheral side projections 44A of the arc-shaped projections 44 have substantially the same configuration as the arc-shaped projections 9 and 10, and the rotary plate 42. On the upper side, four detection areas θ1 to θ4 are provided by outer peripheral side projections 43A and 44A.

Further, the inner peripheral side projection 43 of the arc-shaped projection 43
B is formed in a semicircular shape at an angle of about 180 ° at a position where the outer peripheral projection 43A does not exist in the entire circumference of the rotating plate 42 in the rotation direction, and is disposed radially inward of the outer peripheral projection 43A. Further, each inner peripheral projection 44B of the arc-shaped projection 44 is formed in an arc shape at an angle of about 90 ° at a position where the outer peripheral projection 44A does not exist in the entire circumference of the rotating plate 42, and the outer peripheral projection 44A It is arranged radially inward.

On the other hand, as shown in FIG. 8, the signal output device 45 corresponds to the first and second arc-shaped projections 43 and 44 similarly to the signal output device 11 according to the first embodiment. Two rotation detecting units 46 and 47 are provided.

The rotation detecting section 46 includes a magnet 4
6A, and two Hall elements 46B and 46C corresponding to the outer peripheral side projection 43A and the inner peripheral side projection 43B of the arc-shaped projection 43, respectively.
The outer peripheral side projection 44A of the arc-shaped projection 44, the inner peripheral side projection 4
Two Hall elements 47B and 47C are provided corresponding to 4B.

Then, the rotation detecting section 46 is provided with the Hall element 4
A rotation sensor of a differential type which outputs a cylinder detection signal S1 according to the difference in output level between 6B and 46C is provided. The rotation detecting section 47 is also configured as a similar differential rotation sensor.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
By using the differential type rotation detection units 46 and 47, for example, the difference between the output level between the Hall elements 46B and 46C when the rotation detection unit 46 detects the outer projection 43A of the arc-shaped projection 43 and the inner circumference The difference in output level between the Hall elements 46B and 46C when the side protrusion 43B is detected can be greatly changed.

As a result, the detection accuracy of the detected areas θ1 to θ4 by the rotation detecting sections 46 and 47 can be improved, for example, the dimensional variation of the arc-shaped projections 43 and 44, the cylinder detection signal S1
, S2, etc., can be reliably determined.

In each of the above embodiments, the rotating plates 7, 22, and 42 are used as the rotating body.
The present invention is not limited to this, and a configuration may be adopted in which a rotating body is formed by a cylindrical or cylindrical drum member, and a plurality of protrusions extending in the circumferential direction at a fixed angle on the outer peripheral surface and axially separated from each other are provided. Good.

In each of the above embodiments, the rotating plates 7, 22, and 42 are provided on the camshaft 3 of the engine. However, the present invention is not limited to this. For example, the rotating plates 7, 22, and 42 are mechanically connected to the crankshaft 2. Alternatively, a rotating body may be provided on another rotating shaft or the like that rotates at half the number of rotations.

Further, in each of the above embodiments, the arcuate projections 8 to 10, 23 to 27
However, the present invention is not limited to this, and a configuration may be adopted in which a concave portion, a slit, or the like that extends in the circumferential direction with respect to the rotating body may be provided. The presence or absence of the slit may be detected by a sensor of the type.

Further, in each of the above embodiments, the case where the engine cylinder discriminating devices 6, 21, 41 are applied to a four-cylinder engine or a six-cylinder engine has been described as an example, but the present invention is not limited to this. Instead, the present invention may be applied to a two-cylinder, three-cylinder, or five-cylinder engine, and further to a seven-cylinder or more engine.

[0089]

As described above in detail, according to the first aspect of the present invention, the rotating body is provided with a plurality of detected areas corresponding to the number of cylinders of the engine. Since it is configured to extend along the direction and have different shapes from each other, when starting the engine, it is possible to immediately determine the cylinder of the engine when power is applied to the signal output means regardless of the stop position of the output shaft. . As a result, even before the output shaft of the engine is rotationally driven by a starter or the like, it is possible to reliably determine which of the cylinders first reaches the top dead center after starting the engine, and to control the fuel injection to each cylinder. , Ignition control etc. can be started early,
The engine can be started in a short time.

According to the second aspect of the present invention, each detected area is constituted by combining a plurality of arc-shaped projections.
The signal output means includes a plurality of rotation detecting sections each having a circular projection.
Since it is configured to output a different cylinder detection signal for each detected area by detecting the absence, the arc-shaped projection can be extended in the entire circumferential direction within each detected area, and the rotation position of the output shaft of the engine can be set. Regardless, cylinder discrimination can be performed immediately at an arbitrary rotational position. Also, by merely providing a number of rotation detection units smaller than the number of cylinders of the engine in the signal output means, these rotation detection units detect the presence or absence of each arc-shaped projection having a different combination for each detection area. Thus, each detected area can be reliably identified by a combination of the cylinder detection signals output from each rotation detection unit, and the cylinder discriminating apparatus can be simplified and the number of parts can be reduced.

Further, according to the third aspect of the present invention, four detection areas in which the first and second arc-shaped projections exist in different combinations are provided on the rotating plate. By simply providing two rotation detectors and the like corresponding to the arc-shaped projections in the signal output means, four detected areas can be identified by a combination of the cylinder detection signals from each rotation detector, and the cylinder discrimination of the four-cylinder engine Can be performed reliably.

According to the fourth aspect of the present invention, six detected areas in which first, second, and third arc-shaped projections are present in different combinations are provided on the rotating plate. Therefore, only by providing three rotation detecting sections and the like corresponding to the respective arc-shaped projections in the signal output means, it is possible to identify six detected areas by a combination of the cylinder detection signals from the respective rotation detecting sections. Can be reliably determined.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an engine cylinder discriminating apparatus according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a rotating plate in FIG. 1;

FIG. 3 is an enlarged sectional view showing the detection device in FIG. 1;

FIG. 4 is a front view of a rotating plate showing an arrangement of each arc-shaped projection.

FIG. 5 is a characteristic diagram showing a relationship between a crank angle and output states of a cylinder detection signal, a position signal, an injection signal, and a start signal when the engine is started.

FIG. 6 is a front view showing a rotating plate of the engine cylinder discriminating apparatus according to the second embodiment.

FIG. 7 is a front view showing a rotating plate of a cylinder discriminating device for an engine according to a third embodiment.

FIG. 8 is a cross-sectional view illustrating a detection device that detects an arc-shaped protrusion in FIG.

FIG. 9 is a characteristic diagram similar to FIG. 5, showing a starting state of the engine when a cylinder discriminating device for an engine according to the prior art is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine main body 1A Cylinder 2 Crankshaft 3 Camshaft 6,21,41 Cylinder discriminating device 7,22,42 Rotating plate (rotating body) 8,23,43 First arc-shaped projection 9,10,24,25,44 Second arc-shaped projections 26, 27 Third arc-shaped projections 11, 28, 45 Signal output device (signal output means) 13, 14, 29, 30, 31, 46, 47 Rotation detectors θ1 to θ4, θ1 ' ~ Θ6 ′ Detected area (detected area)

Claims (4)

[Claims] 1. A rotating body which is rotated by an output shaft of an engine and provided with a plurality of detected parts corresponding to respective cylinders of the engine, and a rotating body provided in the vicinity of the rotating body and provided with a plurality of detected parts. In a cylinder discriminating device for an engine, comprising: a signal output unit that outputs a cylinder detection signal corresponding to a detecting unit, wherein each of the detected portions of the rotating body is formed on the rotating body corresponding to the number of cylinders of the engine. A cylinder discriminating device for an engine, comprising: a plurality of detection areas, wherein each of the detection areas extends along a rotation direction of the rotating body and has a different shape. 2. The method according to claim 1, wherein each of the detected areas is formed by combining a plurality of arc-shaped protrusions extending in a circumferential direction of the rotating body, and the signal output unit outputs a plurality of rotation detections corresponding to the respective arc-shaped protrusions. The engine cylinder discriminating apparatus according to claim 1, further comprising: a unit configured to output a different cylinder detection signal for each of the detected areas by detecting the presence or absence of each of the arc-shaped protrusions. 3. The rotating body comprises a rotating plate having first and second arc-shaped projections provided apart from each other in a radial direction, and the first and second arc-shaped projections are provided on the rotating plate. 3. A cylinder discriminating apparatus for an engine according to claim 1, wherein four detection areas are provided which extend in different combinations. 4. The rotating body comprises a rotating plate having first, second and third arc-shaped projections provided apart from each other in a radial direction. Third
The cylinder discriminating device for an engine according to claim 1 or 2, wherein the arc-shaped projections are provided with six detection areas extending in different combinations.