JP3913135B2 - Abnormal combustion detection method, abnormal combustion adjustment method and apparatus for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine, and more particularly to an abnormal combustion detection method and apparatus for an internal combustion engine that detects abnormal combustion such as knocking in a combustion chamber (cylinder) of a gas engine. The present invention relates to an abnormal combustion detection method and apparatus capable of specifying (position).
[0002]
[Prior art]
Generally, in a torch ignition gas engine, since it is premixed combustion, knocking due to non-uniformity in the concentration distribution of the mixed gas in the combustion chamber is likely to occur. One of the major issues is to prevent the occurrence of such knocking, avoid a decrease in combustion efficiency, and prevent the combustion chamber surrounding members from being damaged due to the knocking. In order to suppress such knocking, it is necessary to accurately detect that knocking has occurred during engine operation and to take measures to prevent knocking quickly.
[0003]
Conventionally, as a technique for detecting the occurrence of knocking in a gas engine, for example, a knocking determination method described in JP-A-8-128354 is known (hereinafter referred to as a conventional example).
[0004]
In the conventional example, the vibration of the engine is detected by an acceleration sensor, the detection vibration data is subjected to a predetermined process, process detection data is created and continuously stored, and each of the process detection data is stored in these processes. Compared with the threshold value, the ratio of data exceeding the threshold value among the predetermined number of processing detection data is calculated, and when this ratio exceeds a certain value, it is determined that knocking has occurred.
[0005]
By the way, in a premixed internal combustion engine (engine) such as a gas engine, the above-mentioned knocking in which the premixed gas burns rapidly often occurs, and this knocking is the engine efficiency limit. Then, as described above, when knocking is detected, for example, combustion control (hereinafter simply referred to as knocking control) that delays ignition timing or the like to suppress knocking is performed (that is, knocking is performed with reduced efficiency). ).
[0006]
[Problems to be solved by the invention]
However, when performing knocking control, as in the conventional example, it is determined whether knocking has occurred in the combustion chamber, and if knocking is determined to occur, the control shifts to knocking control. The location where knocking has occurred in the room, that is, the location (position) where abnormal combustion has occurred is not specified, and it is simply determined whether knocking has occurred in the combustion chamber, and knocking control is performed. However, there is a problem that it is difficult to accurately perform knocking control.
[0007]
In other words, by simply detecting the presence or absence of knocking and detecting the occurrence of knocking, simply shifting to knocking control will focus on only knocking suppression and unnecessarily reduce efficiency. There is a problem that knocking control cannot be performed with high accuracy.
[0008]
In any case, in the conventional example, the presence or absence of knocking in the combustion chamber is merely determined, and it is not possible to detect where knocking has occurred in the combustion chamber.
[0009]
An object of the present invention is to provide an abnormal combustion detection method and apparatus for an internal combustion engine that can easily detect the position of abnormal combustion (abnormal combustion occurrence site) when abnormal combustion such as knocking occurs in a combustion chamber. There is.
[0010]
Another object of the present invention is to provide an abnormal combustion adjustment method and apparatus for an internal combustion engine that can accurately adjust abnormal combustion.
[0011]
[Means for Solving the Problems]
  According to the present invention, there is provided an abnormal combustion detection method for an internal combustion engine for detecting the abnormal combustion when abnormal combustion occurs in the combustion chamber of the internal combustion engine, wherein at least first to third different from each other in the combustion chamber. A measurement step of simultaneously measuring pressure or light emission resulting from combustion in the combustion chamber at a measurement position to obtain first to third measurement results;When the abnormal combustion occurs according to the first to third measurement results, a time difference at which the pressure or light emission related to the abnormal combustion reaches the first to third measurement positions is determined as the first measurement. The first and third measurement positions are obtained between the position and the second measurement position, the second measurement position and the third measurement position, and the third measurement position and the first measurement position, respectively. An arrival time difference calculating step as an arrival time difference, and the first measurement position, the second measurement position, the second measurement position, and the third measurement based on the first to third arrival time differences, respectively. A distance difference calculating step for obtaining a position and a distance difference between the third measurement position and the first measurement position as first to third distance differences; and a radius r centered on the first measurement position A radius (r + first) centered on the first sphere and the second measurement position The radius r = (1/2) × {(distance between the first and second measurement positions) −the first distance difference} with respect to the second sphere of separation) as the initial value. a first surface calculation step for obtaining a first surface which is a set of intersection lines of the first sphere and the second sphere when r is increased; and a radius r centered on the second measurement position Of the third sphere and a fourth sphere having a radius (r + second distance difference) centered on the third measurement position, the radius r = (1/2) × {(the second and the second 3) (the distance between the three measurement positions) −the second distance difference} as an initial value, and the radius r is increased, the second surface is a set of intersection lines of the third sphere and the fourth sphere. A second surface calculating step for obtaining
  In the fifth sphere having a radius r centered on the third measurement position and the sixth sphere having a radius (r + third distance difference) centered on the first measurement position, the radius r = (1 / 2) × {(distance between the third and first measurement positions) −the third distance difference} as an initial value when the radius r is increased, the fifth sphere and the sixth sphere A third surface calculating step for obtaining a third surface which is a set of intersecting lines, and calculating the intersecting line of any two of the first to third surfaces as a calculated intersecting line. A determination step of determining a line and the remaining surface of the first to third surfaces and an intersection as the abnormal combustion detection position.An abnormal combustion detection method for an internal combustion engine characterized by the above can be obtained.
[0015]
Further, the present invention includes an abnormal combustion detection step of determining that abnormal combustion has occurred when at least one of the first to third measurement results exceeds a preset threshold level. An abnormal combustion detection step may be provided in which vibration generated in the combustion chamber is detected and it is determined that the abnormal combustion has occurred when the vibration level exceeds a predetermined vibration threshold level.
[0016]
Furthermore, the present invention includes an injection step of injecting a suppression fluid for suppressing abnormal combustion toward the abnormal combustion detection position when the abnormal combustion detection position obtained as described above is received. An abnormal combustion adjustment method for an internal combustion engine is obtained. In this way, the suppression fluid can be injected toward the abnormal combustion position detected as described above, and abnormal combustion can be adjusted with high accuracy.
[0017]
  According to the present invention, in the abnormal combustion detection device for an internal combustion engine for detecting the abnormal combustion when the abnormal combustion occurs in the combustion chamber of the internal combustion engine, at least first to third measurement positions different from each other in the combustion chamber. Measuring means for simultaneously measuring pressure or light emission resulting from combustion in the combustion chamber to obtain first to third measurement results;When the abnormal combustion occurs according to the first to third measurement results, a time difference at which the pressure or light emission related to the abnormal combustion reaches the first to third measurement positions is determined as the first measurement. The first and third measurement positions are obtained between the position and the second measurement position, the second measurement position and the third measurement position, and the third measurement position and the first measurement position, respectively. An arrival time difference calculating means for obtaining an arrival time difference, and the first measurement position, the second measurement position, the second measurement position, and the third measurement based on the first to third arrival time differences, respectively. A distance difference calculating means for obtaining a position and a distance difference between the third measurement position and the first measurement position as first to third distance differences; and the first measurement position and the second measurement position. Measurement position, second measurement position and third measurement position, and third measurement position A plurality of three-dimensional curved surfaces corresponding to the first to third distance differences are formed between the first measurement position and the first measurement position, and an intersection where the plurality of three-dimensional curved surfaces intersect is detected as the abnormal combustion occurrence position. Having abnormal combustion position detection meansAn abnormal combustion detection device for an internal combustion engine characterized by the above can be obtained.
[0019]
In the present invention, for example, there is an abnormal combustion detection means for determining that abnormal combustion has occurred when at least one of the first to third measurement results exceeds a preset threshold level. Further, an acceleration sensor for detecting vibration generated in the combustion chamber, and an abnormal combustion detection means for determining that the abnormal combustion has occurred when the level of vibration detected by the acceleration sensor exceeds a predetermined vibration threshold level You may make it have.
[0020]
In the present invention, an internal combustion engine having injection means for injecting a suppression fluid for suppressing abnormal combustion toward the abnormal combustion detection position when the abnormal combustion detection position obtained as described above is received. An abnormal combustion adjusting device is obtained.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example.
[0022]
Here, an abnormal combustion (knocking) detection device used in a torch ignition type gas engine will be described. First, referring to FIG. 1, a torch ignition type engine (hereinafter simply referred to as an engine) 100 includes a piston 102, a cylinder head 103 a, and a cylinder portion 103 b, and the piston 102, cylinder head 103 a, A combustion chamber 101 is defined by the cylinder portion 103b. Further, the illustrated engine 100 is provided with a torch sub chamber 104 for torch ignition.
[0023]
On the side surface of the cylinder portion 103b, at least three pressure sensors are respectively attached to different locations facing the combustion chamber 101 (only one pressure sensor 1a is shown in FIG. 1). The pressure sensor is connected to the controller 10. When mounting the pressure sensor, it is necessary to prevent the airtightness of the cylinder portion 103b from being impaired. The pressure sensor may be attached to the cylinder head 103a.
[0024]
As will be described later, the controller 10 detects and identifies an abnormal combustion (knocking) position (part) according to the pressure in the combustion chamber 101 detected by the pressure sensor, and executes knocking control according to the detection result. To do. That is, the controller 10 controls the fluid ejection device 20 and the valve rotation device 22 described later according to the pressure signal detected by the pressure sensor.
[0025]
As shown in FIG. 1, a fluid injection valve 26 is attached to the cylinder head 103a, and a valve rod 261 of the fluid control valve 26 is fitted in the cylinder head 103a so as to be rotatable and vertically movable. . In FIG. 1B showing the details of the fluid injection valve 26, a seal member 26a is slidably contacted with the outer peripheral surface of the valve rod 261 of the fluid injection valve 26 to seal the gas in the combustion chamber 101.
[0026]
The fluid injection valve 26 is rotated in the combustion chamber 101 in response to a control operation signal from the controller 10 and injects a knocking suppression fluid such as water and steam into a portion where knocking occurs as described later. To do.
[0027]
A fluid passage 262 is provided in the fluid injection valve 26, and an injection hole 263 is bored at the tip of the fluid injection valve 26 so as to open toward the combustion chamber 101. . 264 is provided with a check valve 264 between the fluid passage 262 and the injection hole 263, and is configured to allow only a flow from the fluid passage 262 side to the injection hole 263 side, that is, the combustion chamber 101 side. The backflow of the combustion gas from the combustion chamber 101 is prevented.
[0028]
The rotating device 026 is driven to rotate the fluid injection valve 26, and the rotational force from the valve rotating device 22 controlled by the controller 10 is fitted to the gear 24 and the valve rod 261 so as not to rotate relative to each other and to be relatively movable in the axial direction. Further, the fluid is transmitted to the fluid injection valve 26 via the gear 25, and the fluid injection valve 26 is rotated to inject the suppression fluid toward the knocking position.
[0029]
The fluid ejection device 20 is supplied with a suppression fluid for knocking such as water or steam through the suppression fluid supply pipe 27, and the fluid ejection device 20 pressurizes the suppression fluid and is a fluid coupling 21 attached to the upper portion of the fluid ejection valve 26. Through the fluid injection valve 26.
[0030]
Referring to FIG. 2, three pressure sensors 1a to 1c are attached at different positions on the side surface of cylinder portion 103b (in FIG. 2, the attachment positions of pressure sensors 1a to 1c are respectively indicated by (1) to (▲). 3), these pressure sensors 1 a to 1 c face the combustion chamber 101. When attaching the pressure sensors 1a to 1c, as shown in FIG. 2, it is desirable to attach the pressure sensors 1a to 1c in the same plane in a three-dimensional space.
[0031]
Now, assume that abnormal combustion, that is, knocking occurs at a position indicated by P in FIG. When knocking occurs, a pressure wave (shock wave) due to rapid combustion is generated and propagates in the combustion chamber 101 (L1 to L3 represent the distances from the pressure sensors 1a to 1c to the knocking occurrence position P for convenience. This distance naturally varies depending on the knocking occurrence position P).
[0032]
The pressure sensors 1 a to 1 c always detect the pressure in the combustion chamber 103 and send the detection result to the controller 10. As shown in FIG. 3, the controller 10 includes a knocking generation detection unit 11a, a knocking position detection unit 11b, a fluid ejection direction calculation unit 12, and a fluid ejection amount calculation unit 13, and pressure signals from the pressure sensors 1a to 1c. (Electrical signals: hereinafter, the pressure signals supplied from the pressure sensors 1a to 1c will be referred to as first to third pressure signals, respectively) are supplied to the knocking generation detection unit 11a. In knocking detection unit 11a, knocking occurs when at least one of the first to third pressure signals exceeds a preset threshold level (threshold level for determining whether knocking has occurred). And a knocking detection signal is sent to the knocking position detector 11b.
[0033]
4 and 5, the first to third pressure signals are given to knocking position detector 11b. When the knocking detection signal is received (FIG. 4: step S1), the following is performed. Execute knocking position detection.
[0034]
Now, assuming that the first to third pressure signals are given to the knocking position detector 11b at the timing shown in FIGS. 5A to 5C by knocking, the first to third pressure signals (peak or edge) are given. ) Is obtained (FIG. 4: Step S2). Specifically, the knocking position detector 11b calculates the difference between the time when the first pressure signal (rising edge) is received and the time when the second pressure signal (rising edge) is received as the time Δt.₁₂(First difference in arrival time).
[0035]
Similarly, the difference between the time at which the second pressure signal (rising edge) is received and the time at which the third pressure signal (rising edge) is received is expressed as time Δt.₂₃As (second arrival time difference). The difference between the time at which the third pressure signal (rising edge) is received and the time at which the first pressure signal (rising edge) is received is expressed as time Δt.₃₁As (second arrival time difference). These time differences Δt₁₂, Δt₂₃, And Δt₃₁Is an absolute value (in seconds).
[0036]
Next, the knocking position detector 11b obtains a difference in distance from each of the pressure sensors 1a to 1c to the knocking occurrence position based on the above-described time difference (FIG. 4: Step S3). Specifically, assuming that the distance between the knocking occurrence position and the pressure sensors 1a to 1c is L1 to L3, respectively (the mounting positions of the pressure sensors 1a to 1c (positions of the three-dimensional coordinates) in the knocking position detection unit 11b) If the sound speed is C (m / sec), the absolute value (L1−L2) = ΔL12 = C × Δt₁₂It is. Similarly, absolute value (L2−L3) = ΔL23 = C × Δt₂₃, Absolute value (L3−L1) = ΔL31 = C × Δt₃₁It is.
[0037]
Thus, after obtaining the distance difference for each of the pressure sensors 1a to 1c (attachment positions), the knocking position detection unit 11b generates knocking as follows with one of the pressure sensors 1a to 1c as a reference position. The surface to which the position belongs is defined (FIG. 4: step S4). Note that a three-dimensional curved surface is formed when the surface on which the knocking position occurs is defined. Here, a sphere will be described as an example of the three-dimensional curved surface.
[0038]
First, the knocking position detector 11b defines an orthogonal coordinate system (three-dimensional) including the combustion chamber 101, and plots the mounting positions {circle around (1)} to {circle around (3)} of the pressure sensors 1a to 1c on this orthogonal coordinate system. Then, a sphere (first sphere) having a radius r (r is an arbitrary number) is defined with the pressure sensor 1a as a reference position. On the other hand, a sphere (second sphere) having a radius (r + ΔL12) is defined using the pressure sensor 1b as a reference position.
[0039]
As shown in FIG. 6A, when r = (1/2) (L12−ΔL12), a sphere having a radius r and a sphere having a radius (r + ΔL12) form only an intersection ( L12 is the distance between the pressure sensor 1a and the pressure sensor 1b, and since the mounting positions of the pressure sensors 1a to 1c are set in advance in the knocking position detector 11b, the distance L12 can be obtained), radius r> When (1/2) (L12−ΔL12), the sphere having the radius r and the sphere having the radius (r + ΔL12) can intersect (circle) (see FIG. 6B). The knocking occurrence position exists at least on this circle, but since the radius r is an arbitrary value, the radius r is gradually increased with r = (1/2) (L12−ΔL12) as a starting point. Then, a surface (first surface) CA that is a set of intersecting lines is defined (see FIG. 7).
[0040]
Similarly, a sphere having a radius r (third sphere) is defined using the pressure sensor 1b as a reference. On the other hand, a sphere (fourth sphere) having a radius (r + ΔL23) is defined using the pressure sensor 1c as a reference position. From r = (1/2) (L23−ΔL23) (L23 is the distance between the pressure sensor 1b and the pressure sensor 1c), the surface is a set of intersection lines shown in FIG. Second side) CB is defined.
[0041]
Furthermore, a sphere having a radius r (fifth sphere) is defined using the pressure sensor 1c as a reference position. On the other hand, a sphere (sixth sphere) having a radius (r + ΔL31) is defined using the pressure sensor 1a as a reference position. From r = (1/2) (L31−ΔL31) (L31 is the distance between the pressure sensor 1c and the pressure sensor 1a), a surface which is a set of intersecting lines shown in FIG. Third aspect) Define CC. (Step 4 in FIG. 4)
[0042]
Next, in the knocking position detection unit 11b, an intersecting line (first intersecting line) intersecting the first and second surfaces according to the first and second surfaces CA and CB defined as described above. LA) is obtained (see step S5 in FIG. 4: FIG. 8).
[0043]
Further, the knocking position detection unit 11b obtains an intersection PA where the first intersection line LA and the third plane CC intersect according to the first intersection line LA and the third plane CC (step of FIG. 4). S6: See FIG. That is, the intersection of the first intersection line LA and the third surface CC satisfies all the conditions and becomes the knocking occurrence position. Then, the knocking position detector 11b sets the intersection PA as the knocking occurrence position P (FIG. 4: step S7).
[0044]
As described above, the obtained knocking occurrence position is given to the fluid ejection direction calculation unit 12. Note that the order of obtaining the first to third surfaces is not particularly defined, and finally, the intersection PA where the first to third surfaces intersect may be obtained.
[0045]
When the fluid ejection direction calculation unit 12 receives the knocking detection position, the fluid ejection direction calculation unit 12 obtains the suppressed fluid ejection direction based on the relative relationship between the installation position of the fluid ejection valve 26 and the knocking detection position. The calculated suppression fluid ejection direction is given to the fluid ejection control unit 14.
[0046]
As shown in FIG. 3, the fluid injection amount calculation unit 13 is connected to an engine speed detector 15 that detects the engine speed and an engine output detector 16 that detects an engine output (engine load). The fluid injection amount calculation unit 13 is supplied with the engine speed and the detected value of the engine output from the engine speed detector 15 and the engine output detector 16, respectively.
[0047]
The fluid injection amount calculation unit 13 calculates the injection amount of the knocking suppression fluid corresponding to the engine operation state based on the engine operation state detection value indicating the detected value of the engine speed and the engine output, and performs fluid injection control. Part 14 is given. Thereby, it can control to the injection quantity of the suppression fluid suitable for the detected value of the engine operating state represented by an engine speed and an engine output.
[0048]
The fluid ejection control unit 14 controls the valve rotation device 22 in accordance with the knocking suppression fluid ejection direction given from the fluid ejection direction calculation unit 12 to change the direction of the nozzle hole 263 of the fluid ejection valve 26 to the knocking fluid ejection direction. Turn to. Further, the fluid ejection control unit 14 operates the fluid ejection device 20 based on the ejection amount of the knocking suppression fluid given from the fluid ejection amount selection unit 13.
[0049]
When the fluid injection device 20 and the valve rotation device 22 are controlled as described above, the suppression fluid from the fluid injection valve 26 is injected toward the knocking occurrence position with an injection amount corresponding to the engine operating state. Thus, the combustion temperature in the vicinity of the knocking occurrence point is lowered and the rapid pressure rise is suppressed, and normal combustion can be restored.
[0050]
By the way, in the above-described example, knocking occurrence detection unit 11a knocks when at least one predetermined threshold level of pressure signals (first to third pressure signals) received from pressure sensors 1a to 1c is exceeded. However, an acceleration sensor such as a vibration sensor is attached to the cylinder head or the like, and the acceleration detected by the acceleration sensor is given as an acceleration detection signal to the knocking generation detection unit 11a. The level of the acceleration detection signal When knocking exceeds a predetermined threshold level, it may be recognized that knocking has occurred, and a knocking detection signal may be given from the knocking occurrence detection unit 11a to the knocking position detection unit 11b.
[0051]
Furthermore, in the above example, the pressure wave (shock wave) due to knocking is detected using the pressure sensor, but an optical sensor may be used instead of the pressure sensor. In other words, when abnormal combustion such as knocking occurs, the brightness and the like are different at the position where knocking occurs compared to normal combustion. When the brightness threshold level is exceeded), it is determined that knocking has occurred. And if the time difference which said brightness | luminance change arrives is calculated | required and calculation as mentioned above will be performed, the knocking generation position in a combustion chamber can be specified.
[0052]
In any case, it is only necessary to detect a change in pressure due to knocking or a change in luminance or the like due to light emission and specify the knocking occurrence position as described above.
[0053]
【The invention's effect】
  As described above, according to the present invention, when abnormal combustion is detected in the combustion chamber of the internal combustion engine, when detecting the abnormal combustion, at least first to third measurement positions different from each other in the combustion chamber, The first or third measurement result is obtained by simultaneously measuring the pressure or light emission resulting from the combustion in the combustion chamber, and when abnormal combustion occurs, the combustion chamber in which abnormal combustion has occurred depends on the first to third measurement results. To identify the position as the abnormal combustion occurrence position.When specifying the abnormal combustion position, according to the first to third measurement results, the time difference in which the pressure or light emission related to the abnormal combustion reaches the first to third measurement positions when abnormal combustion occurs, First to third arrivals obtained respectively between the first measurement position and the second measurement position, the second measurement position and the third measurement position, and the third measurement position and the first measurement position. As the time difference, based on the first to third arrival time differences, the first measurement position and the second measurement position, the second measurement position and the third measurement position, and the third measurement position and the first measurement, respectively. A distance difference between the first position and the third position, and a first measurement position, a second measurement position, a second measurement position, a third measurement position, and a third measurement position; A plurality of three-dimensional curved surfaces corresponding to the first to third distance differences are formed between the first measurement position and the plurality of first measurement positions. It is so arranged to detect the intersection dimension curved intersection as abnormal combustion occurrence position, easily identify abnormal combustion occurrence positionThere is an effect that can be done.
[0055]
Furthermore, in the present invention, since the suppression fluid is injected toward the abnormal combustion position detected as described above, there is an effect that the abnormal combustion can be adjusted with high accuracy.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of an abnormal combustion detection device according to the present invention together with a torch ignition type gas engine, (A) is an overall configuration diagram thereof, and (B) is an enlarged sectional view of a Z portion in (A). .
FIG. 2 is a plan view showing the arrangement relationship of the pressure sensors shown in FIG.
FIG. 3 is a control block diagram showing details of the controller shown in FIG. 1;
4 is a flowchart for explaining the operation of the knocking position detection unit shown in FIG. 3; FIG.
FIG. 5 is a diagram illustrating the timing of a shock wave detected by a pressure sensor.
6A and 6B are diagrams for explaining calculation when detecting a knocking position, in which FIG. 6A is a diagram showing a state where two spheres are in contact with each other, and FIG. It is a figure which shows the state which crossed.
7 is a diagram showing a surface formed by the intersection of two spheres when the radius r is increased in FIG. 6;
FIG. 8 is a diagram showing a line of intersection between two surfaces formed as shown in FIG. 7;
FIG. 9 is a diagram showing a state where an intersection point between the intersection line shown in FIG. 7 and another surface is an abnormal combustion position.
[Explanation of symbols]
1a to 1c pressure sensor
10 Controller
11a Knock occurrence detection unit
11b Knocking position detector
12 Fluid injection direction calculation unit
13 Fluid injection amount calculation unit
14 Fluid injection control unit
15 Engine speed detector
16 Engine output detector
20 Fluid ejection device
22 Valve rotation device
26 Fluid injection valve
100 torch ignition engine
101 Combustion chamber
102 piston
104 Torch subchamber

Claims (8)

An abnormal combustion detection method for an internal combustion engine for detecting abnormal combustion when abnormal combustion occurs in a combustion chamber of the internal combustion engine,
A measurement step of simultaneously measuring pressure or light emission resulting from combustion in the combustion chamber at at least first to third measurement positions different from each other in the combustion chamber to obtain first to third measurement results;
When the abnormal combustion occurs according to the first to third measurement results, a time difference at which the pressure or light emission related to the abnormal combustion reaches the first to third measurement positions is determined as the first measurement. The first and third measurement positions are obtained between the position and the second measurement position, the second measurement position and the third measurement position, and the third measurement position and the first measurement position, respectively. An arrival time difference calculating step as an arrival time difference;
Based on the first to third arrival time differences, the first measurement position, the second measurement position, the second measurement position, the third measurement position, and the third measurement position, respectively. A distance difference calculating step for obtaining a distance difference between the first measurement position and the first to third distance differences;
In the first sphere having a radius r centered on the first measurement position and the second sphere having a radius centered on the second measurement position (r + first distance difference), the radius r = (1 / 2) × {(distance between the first and second measurement positions) −the first distance difference} when the radius r is increased as an initial value, the first sphere and the second sphere A first surface calculating step for obtaining a first surface that is a set of intersecting lines of
The radius r = (1) in a third sphere having a radius r centered on the second measurement position and a fourth sphere having a radius (r + second distance difference) centered on the third measurement position. / 2) × {(the distance between the second and third measurement positions) −the second distance difference} when the radius r is increased as an initial value, the third sphere and the fourth sphere A second surface calculating step for obtaining a second surface that is a set of intersecting lines with:
In the fifth sphere having a radius r centered on the third measurement position and the sixth sphere having a radius (r + third distance difference) centered on the first measurement position, the radius r = (1 / 2) × {(distance between the third and first measurement positions) −the third distance difference} as an initial value when the radius r is increased, the fifth sphere and the sixth sphere A third surface calculating step for obtaining a third surface that is a set of intersecting lines of
The intersecting line between any two of the first to third surfaces is obtained as a calculated intersecting line, and the calculated intersecting line and the remaining surface of the first to third surfaces intersect with the abnormal point. An abnormal combustion detection method for an internal combustion engine, comprising: a determination step for determining the combustion detection position . The abnormal combustion generation detection step of determining that abnormal combustion has occurred when at least one of the first to third measurement results exceeds a preset threshold level . Abnormal combustion detection method for an internal combustion engine. 2. The abnormal combustion determination step of detecting an abnormal combustion by detecting vibration generated in the combustion chamber and determining that the abnormal combustion has occurred when the level of the vibration exceeds a predetermined vibration threshold level. An abnormal combustion detection method for an internal combustion engine as described. 4. An abnormal fluid detection method for an internal combustion engine according to any one of claims 1 to 3, wherein when the abnormal combustion detection position is received, a suppression fluid is injected toward the abnormal combustion detection position to suppress abnormal combustion. An abnormal combustion adjustment method for an internal combustion engine, characterized by comprising an injection step of: In the abnormal combustion detection device for an internal combustion engine for detecting the abnormal combustion when abnormal combustion occurs in the combustion chamber of the internal combustion engine,
In the combustion chamber at at least first to third measurement positions different from each other in the combustion chamber. Measuring means for simultaneously measuring the pressure or light emission resulting from combustion in the first to obtain the first to third measurement results, and when the abnormal combustion occurs according to the first to third measurement results, the abnormal combustion The time difference at which the pressure or the light emission related to the first to the third measurement positions reaches, the first measurement position and the second measurement position, the second measurement position and the third measurement position, And arrival time difference calculating means for obtaining the first to third arrival time differences respectively obtained between the third measurement position and the first measurement position, and based on the first to third arrival time differences. A distance difference between the first measurement position and the second measurement position, the second measurement position and the third measurement position, and the third measurement position and the first measurement position, respectively. Distance difference calculating means for obtaining first to third distance differences and the first measurement Between the first measurement position and the second measurement position, between the second measurement position and the third measurement position, and between the third measurement position and the first measurement position, respectively. Abnormal combustion detection of an internal combustion engine, comprising: an abnormal combustion position detecting means that forms a plurality of three-dimensional curved surfaces according to a distance difference and detects an intersection where the plurality of three-dimensional curved surfaces intersect as the abnormal combustion occurrence position apparatus. The internal combustion engine according to claim 5, further comprising an abnormal combustion detection unit that determines that abnormal combustion has occurred when at least one of the first to third measurement results exceeds a preset threshold level. Engine abnormal combustion detection device. An acceleration sensor for detecting vibrations generated in the combustion chamber;
6. The internal combustion engine according to claim 5, further comprising: an abnormal combustion detection unit that determines that the abnormal combustion has occurred when a level of vibration detected by the acceleration sensor exceeds a predetermined vibration threshold level. Abnormal combustion detection device. 8. When used with the abnormal combustion detection device for an internal combustion engine according to any one of claims 5 to 7, and when receiving the abnormal combustion detection position, a suppression fluid is injected toward the abnormal combustion detection position to suppress abnormal combustion. An abnormal combustion adjusting device for an internal combustion engine, characterized by comprising injection means for performing the operation.

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