JP2000297685A - Cylinder determination system for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable quick determination of cylinders within two revolutions of an internal combustion engine, where control is implemented utilizing plural kinds of reference signals per cylinder only from a signal plate mounted on a cam shaft for both cylinder determination and revolution detection. SOLUTION: A cylinder determination system comprises a signal plate mounted on revolving part of an internal combustion engine, and a concave or a convex part for generating in signal plate four signals A, B, C, D, three signals A, B, C, two signals A, B, and three signals A, B, C in sequence, with respect to prescribed positions of respective cylinders of the internal combustion engine. The cylinder detection system further comprises detection sensors arranged to detect signals based on the concave or convex parts. The cylinder detection system further comprises a means for calculating an interval between the signals and storing it, and comparing it with a previous interval and storing relative lengths as a result of the comparison. The position of a prescribed crank angle for a prescribed cylinder is detected from the result of the relative lengths stored as above for five, six, or seven times of detection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder discriminating apparatus for discriminating which cylinder is in a specific stroke while an internal combustion engine is rotating. The present invention relates to a cylinder determining device.

[0002]

2. Description of the Related Art An internal combustion engine has one cycle of its operation.
For example, in a multi-cylinder internal combustion engine having two or more cylinders, any one of the cylinders has a specific stroke, for example, a compression stroke, for controlling ignition timing and fuel injection timing. Needs to be identified. Therefore, a cylinder discriminating device is required.

In such a cylinder discriminating apparatus, as shown in Japanese Patent Application Laid-Open No. 5-86953, three discs for crank angle discrimination are provided on a disc for rotation detection mounted on a camshaft. Provision is made at equal intervals, a projection for cylinder determination of the first cylinder is added, so that a plurality of signals are generated at irregular intervals, the arrangement of the pulse intervals of the plurality of signals is checked, and only the crank angle determination pulse is detected. The crank angle is determined at the time of detecting a predetermined arrangement pattern by, the time at which a predetermined arrangement pattern including a cylinder determination pulse is detected,
There is a method of judging a cylinder when a change in a predetermined pulse interval is detected at the position of a cylinder judging pulse.

According to the above-described determination method, there is a method in which fuel is injected into all cylinders when the crank angle is determined, and the corresponding cylinder is mechanically ignited by a distributor to start the internal combustion engine.

[0005]

However, in the prior art, the crank angle is determined at the time when a predetermined arrangement pattern based on only the crank angle determination pulse is detected, and the predetermined arrangement pattern including the cylinder determination pulse is detected. Time of day,
Since the cylinder is determined when a change in the predetermined pulse interval is detected at the position of the cylinder determination pulse, the cylinder cannot be determined until the camshaft makes one rotation at maximum, that is, the crankshaft makes two rotations. Therefore, instead of the method of mechanically igniting the relevant cylinder by the distributor, when igniting by electronic distribution, it is not possible to ignite the relevant cylinder until the cylinder determination is completed, so it takes time to start the internal combustion engine. Take it.

An object of the present invention is to provide a case in which control is performed using only one signal plate for cylinder determination and rotation detection mounted on a rotating portion of an internal combustion engine using a plurality of types of reference signals per cylinder. Therefore, the cylinder determination can be performed quickly within two revolutions of the internal combustion engine, and even in an internal combustion engine that performs ignition by electronic power distribution, startability equal to or higher than that of an internal combustion engine that performs ignition by a distributor is ensured.

[0007]

An object of the present invention is to provide a signal plate mounted on a rotating part of an internal combustion engine and a signal plate provided with a predetermined stroke of each cylinder of the internal combustion engine.
Signals (A, B, C, D) and three signals (A, B,
C), a concave portion or a convex portion, and a signal based on the concave portion or the convex portion are detected so that signals are generated in the order of two signals (A, B) and three signals (A, B, C). Means for calculating and storing a time interval of the signal, comparing the time interval with a previous time interval, and storing the length of the result; and This is achieved by using a cylinder determination device for an internal combustion engine, which detects a predetermined crank angle position of a predetermined cylinder from the result of the length.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. First, FIG. 3 shows a system configuration diagram of a fuel injection device to which the present invention is applied. 1 is an air cleaner, 2 is a throttle valve assembly having a throttle valve for controlling the amount of intake air, that is, a throttle body, and a plurality of intake branch pipes 4 for branching and supplying air to each cylinder of the engine 5 are connected to the outlet. Have been. Reference numeral 6 denotes an electronically controlled fuel injection valve attached to the intake branch pipe 4. An intake valve 7 is provided on a suction side of the engine 5, and an exhaust valve 8 is provided on a discharge side. Reference numeral 10 denotes a controller, which receives the outputs of an O ₂ sensor 11, a water temperature sensor 12, a crank angle sensor 13, a pressure sensor 16, a throttle sensor 17, etc., as inputs, a fuel injection valve 6, an ignition coil 9, an ISC valve 21, a fuel pump 31
And outputs a control signal to the same. 22 is a battery, 2
3 is a main relay for the controller 10, and 24 is a fuel pump relay. 30 is a fuel chamber, and the fuel is
After being sucked out by the fuel pump 31 and adjusted in pressure by the pressure regulator 32, it reaches the fuel injection valve 6 through the fuel pipe 33. The appropriate injection amount of the fuel injection valve 6 is calculated and determined by the controller 10 based on inputs from various sensors.

As shown in FIG. 4, the crank angle sensor 13 captures a change A in the magnetic field generated each time a projection provided on the signal plate 15 passes, and a change B in the internal processing circuit.
Is generated and sent to the controller 10. FIG. 5 shows the internal configuration of the controller 10. Controller 1
Reference numeral 0 denotes a computer including an input circuit 191, an A / D changing unit 192, a central processing unit 193, a ROM 194, a RAM 195, and an output circuit 196. The input circuit 191 receives an analog signal (for example, a signal from the water temperature sensor 12, the throttle opening sensor 17 or the like), removes a noise component from the approximate signal, and converts the signal into an A / D converter 192. For output to

The central processing unit 193 fetches the approximate A / D conversion result and executes a fuel injection control program stored in a medium such as the ROM 194 or a predetermined control program for other control to execute each of the above control. And a function of executing diagnosis and the like. Note that the calculation result and the A / D conversion result are temporarily stored in the RAM 195, and the calculation result is output as a control output signal 197 through an output circuit 196, so that the fuel injection valve 6, the ignition coil 9 and the like are output. Used for control. On the other hand, the crank angle sensor 1
Similarly, the signal of No. 3 is identified by the input circuit 191 to determine the presence or absence of the signal, and as a HIGH / LOW signal,
It is sent to the central processing unit 193.

In the central processing unit 193, when the voltage level of the signal line 198 changes from LOW to HIGH, FIG.
The interrupt processing is performed at the timing indicated by C in FIG. The time measurement between the protrusions is as follows.
As the internal combustion engine rotates, the projection provided on the signal plate passes through the crank angle sensor. The crank angle sensor generates a signal as the protrusion passes. The time when the signal is generated is stored, and the time T between the protrusions is calculated from the time when the signal is generated next time.

FIG. 2 is a diagram showing a problem of a conventional cylinder determination method. Protrusions are provided on the signal plate so that three signals are generated at 97 °, 65 °, and 10 ° before the compression top dead center of each cylinder for crank determination. In addition, as a signal for determining the cylinder of the first cylinder, a signal before the compression top dead center of the first cylinder 160
Protrusions are also provided on the signal plate so that a signal is generated at °. Crank determination and cylinder determination are performed using the latest time T between the above signals and the previous time Told, Told × k1 ≧
At the time of T, a predetermined bit of a predetermined RAM is set to “0”, Told × k1
When <T, the predetermined bit of the predetermined RAM is set to “1”, and when the past five bit patterns are set to “01001”,
A 65 ° signal before compression top dead center of a certain cylinder is determined, and when the bit pattern becomes “10101”, a 65 ° signal before compression top dead center of the first cylinder is determined. Therefore, depending on the position where the internal combustion engine starts to rotate, the angle up to the cylinder determination greatly varies from about 400 ° to about 760 °, and there may be a case where the determination requires two or more rotations (720 ° CA). .

FIG. 1 shows a signal form and a cylinder discriminating method which avoid the above problem. The signal form is such that four signals for the compression stroke of the first cylinder are 160 °, 97 °, 6 ° before the compression top dead center.
5 °, 10 °, three signals for the compression stroke of the second and third cylinders 97 °, 65 °, 10 ° before top dead center, and two signals for the compression stroke of the fourth cylinder Before dead center 65
° and 10 °. Cylinder determination from upper signal form
First, as in the above-described conventional example, the latest time T and the previous time T
Using Told, the predetermined bit of the predetermined RAM is set to “0” when Told × k1 ≧ T, and the predetermined bit of the predetermined RAM is set to “1” when Told × k1 <T. Next, a 65 ° signal before the compression top dead center of the specific cylinder is determined from the bit pattern of the past five, six or seven times as a result of the determination.

More specifically, if the bit pattern of the last five times becomes "00100", the value before the compression top dead center of the fourth cylinder becomes 6
5 °, “00101”, 65 ° before the compression top dead center of the second cylinder, and the past six bit patterns are “10100”.
When the bit pattern becomes “1”, it is determined as 65 ° before the compression top dead center of the third cylinder, and when the last seven bit patterns become “1010101”, it is determined as 65 ° before the compression top dead center of the first cylinder. Regardless of the position where the internal combustion engine starts rotating, the angle up to cylinder determination is about 575 °, and even in an internal combustion engine that ignites by electronic distribution, startability equal to or higher than that of an internal combustion engine that ignites by a distributor is secured. 6 shows an overall flow of cylinder determination according to the present invention, which is started when a classen signal is generated. Is calculated by storing the time at which the classen signal was generated last time and subtracting it from the time at which it was generated this time. Proceeding to step 220, it is checked whether the cylinder determination has been completed.If the cylinder determination has been completed, the process proceeds to step 250, a reset determination is performed, and if the reset condition is satisfied, the process proceeds to step 260, and each parameter is initialized. If the cylinder determination has not been completed, the process proceeds to step 230 to generate a bit pattern, proceeds to step 240, performs cylinder determination, and ends the flow.

Next, the details of each step described with reference to FIG. 6 will be described. FIG. 7 shows details of step 210, step 250, and step 260 in FIG. In step 310, the time data between classen signals is updated. Each time data is stored in RAM 198 in the order from newest to T,
Stored as Told. Put the data of T into the old data Told. Next, the routine proceeds to step 320, where the latest time data is fetched and stored in T. Next, the routine proceeds to step 330, where a cylinder determination check is performed. To end the cylinder determination, check the cylinder determination end flag # F720. # F72
If 0 = 0, it is determined that the cylinder determination has not been completed,
Perform bit pattern generation processing. If # F720 = 1,
It is determined that the cylinder determination has been completed, the process proceeds to step 340, and a reset determination is performed. When Told × k2 <T holds, a reset determination is made, and the routine proceeds to step 350, where the bit pattern and the cylinder determination flag are cleared.

FIG. 8 shows details of steps 230 and 240 of FIG. At step 410,
If Told × k1 ≧ T is not satisfied, the process proceeds to step 420, where the bits of the predetermined RAM are shifted to the left, and the lower bits are set to 0. If Told × k1 ≧ T holds, the process proceeds to step 430, where the bits of the predetermined RAM are shifted to the left, and the lower bit is set to 1.

Next, the routine proceeds to step 440, where the predetermined RA
It is checked whether the bit pattern of M matches the bit pattern of the first cylinder determination (“1010101”). If they match, the process proceeds to step 480, where the first cylinder determination is performed, the cylinder determination flag is set, and the process ends.
If they do not match, the process proceeds to step 450, where the predetermined R
It is confirmed whether the bit pattern of AM matches the bit pattern (“101001”) of the third cylinder determination. If they match, the process proceeds to step 490, in which a third cylinder determination is made, a cylinder determination flag is set, and the process ends. If they do not match, the process proceeds to step 460, where the predetermined RA
It is confirmed whether the bit pattern of M matches the bit pattern (“00100”) of the fourth cylinder determination. If they match, the routine proceeds to step 500, where a fourth cylinder determination is made, a cylinder determination flag is set, and the process is terminated. If they do not match, the process proceeds to step 470, where the predetermined RAM
It is confirmed whether the bit pattern of the second pattern matches the bit pattern of the second cylinder determination (“00101”). If they match, the process proceeds to step 510, where the second cylinder determination is performed, the cylinder determination flag is set, and the process ends. If they do not match, it means that the cylinder could not be determined,
The process is terminated as it is, and the cylinder determination is waited until the determination in the next step 410 is completed. This process is repeated until the cylinder determination is completed.

[0018]

As described above, the cylinder determination can be performed for any cylinder, and the cylinder determination can be completed at about 575 ° as a crank angle. Therefore, the startability of the internal combustion engine can be improved regardless of the ignition method.

[Brief description of the drawings]

FIG. 1 is a diagram showing a stroke state of each cylinder and a detection position of a crank angle sensor according to the present invention.

FIG. 2 is a diagram showing a problem of a conventional example of cylinder determination.

FIG. 3 is a system configuration diagram of an internal combustion engine embodying the present invention.

FIG. 4 is a diagram showing output characteristics of a crank angle sensor.

FIG. 5 is an internal configuration diagram of a controller 10 according to the present invention.

FIG. 6 is a diagram showing an overall flow of cylinder determination in the present invention.

FIG. 7 is a flowchart for measuring the time between classmate signals in the present invention.

FIG. 8 is a flowchart for performing cylinder determination according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air cleaner, 2 ... Throttle body, 3 ... Collector, 4 ... Intake branch pipe, 5 ... Internal combustion engine, 6 ... Injection valve, 7 ...
Intake valve, 8: Exhaust valve, 9: Ignition coil, 10: Controller, 13: Base class, 15: Signal plate, 32: Fuel pressure regulating valve (pressure regulator).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02P 3/04 303 F02P 3/04 303G 7/067 302 7/067 302C (72) Inventor Mamoru Nemoto Ibaraki 2477 Takaba, Hitachinaka F-term in Hitachi Car Engineering Co., Ltd. 3G019 CA00 DC06 EC05 GA03 HA15 LA11 3G084 BA06 BA13 BA14 BA17 DA05 DA09 DA27 EA02 EA05 EA07 EA11 EB04 EC02 FA10 FA20 FA21 FA29 FA38 FA39 3G301 HA09 HA09 JA06 LA04 LB00 MA11 NA08 NA09 NB12 NE16 NE23 PA11Z PC01Z PD02Z PE03Z PE04Z PE05Z PE08Z

Claims (4)

[Claims] 1. A signal plate mounted on a rotating part of an internal combustion engine, and four signals (A, B, C, D), for a predetermined stroke of each cylinder of the internal combustion engine are provided on the signal plate.
3 signals (A, B, C), 2 signals (A, B), 3
Cylinder determination device for an internal combustion engine having a concave or convex portion that generates a signal in the order of (A, B, C) signals and a detection sensor arranged to detect a signal based on the concave portion or the convex portion Means for calculating and storing a time interval of the signal, comparing the time interval with a previous time interval, and storing the length of the result, and a predetermined crank angle position of a predetermined cylinder based on the stored results of some lengths. A cylinder determining device for an internal combustion engine, characterized by detecting the following. 2. A cylinder judging device for an internal combustion engine according to claim 1, wherein the signal generation position is determined by A: 10 before compression top dead center.
°, B: 65 ° before top dead center, C: 97 before top dead center
°, D: a cylinder judging device for an internal combustion engine, which is set to 160 ° before the compression top dead center. 3. A cylinder judging device for an internal combustion engine according to claim 1, wherein a time interval of each signal generated and detected based on said concave portion or convex portion is stored as Told, T for each generation order. , Told, T, the length of the time interval is calculated and stored by the following equation, and stored five or six times or seven times.
A cylinder judging device for an internal combustion engine, wherein a predetermined crank angle position of a predetermined cylinder is detected from a result of the number of times. Told × k1 ≧ T: shorter than the previous time interval Told × k1 <T: longer than the previous time interval 4. A cylinder judging device for an internal combustion engine according to claim 3, wherein if the result of the five times is (long, short, long), the cylinder is determined to be 65 ° before the compression top dead center of the fourth cylinder, (Long / short / long / short), it is determined to be 65 ° before the compression top dead center of the second cylinder, and if the result of the six strokes is (short, long, short, long / short), before the compression top dead center of the third cylinder. A cylinder discriminating apparatus for an internal combustion engine, wherein 65 ° discrimination is performed, and when seven long and short results are (short, long, short, short, short and long), 65 ° before compression top dead center of the first cylinder is discriminated.