JPS60616B2 - Institutional identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine identification device suitable for automatically setting the number of cylinders when measuring an engine.

In the conventionally known system, information on the number of cylinders was selected and input using a manual switch such as a rotary switch.

However, with the above-mentioned conventional system, each time the number of cylinders in the target engine changes, the switching operation must be performed manually, which is inconvenient, and there is a possibility of erroneous selection or forgetting to switch.

An object of the present invention is to provide an engine control layer that can automatically input the number of cylinders for engines with different numbers of cylinders.

To this end, in the present invention, as shown in the overall configuration diagram of FIG. means for detecting the signal; and a detector for detecting a reference timing synchronized with the rotation of the engine; The structure includes a main stage that determines and stores the number of cylinders in the engine.

According to this configuration, ``Prior to measuring the engine, the ratio of the frequency of the timing signal from the detector and the frequency of the pre-zero 1 ignition signal is determined and stored while the engine is in operation to determine the number of cylinders. Therefore, the number of cylinders of the engine is automatically determined, information on the number of cylinders is obtained, and the information is automatically input into subsequent measurements of the engine.

The present invention will be described below with reference to embodiments shown in the drawings.

Figure 1 is a configuration diagram of the engine top dead detector, which constitutes a detector that detects the reference timing synchronized with the rotation of the engine. 12 is an iron disc with one salient pole; It is attached to the crankshaft 11.The electromagnetic pickup 13 picks up the disk 12 when the crankshaft 11 of the engine reaches the top.
It is attached to the salient pole of. P1 and P2 are electromagnetic pick-ups. This is the state of No. 13 coil.

FIG. 2 is a voltage waveform diagram at points ■, ■◎■ on FIG. 3, and time t (sec) is taken at the axis.

FIG. 3 is an electrical wiring diagram of the main parts of the first embodiment of the present invention.

P3 is connected to the e terminal of the ignition coil, and P1, P2
is connected to the coil of the electromagnetic pickup 13. 30
Reference numeral 1 denotes a comparator amplifier, which is connected to terminals P1 and P2 and shapes the waveform of the output of the electromagnetic pickup 13 applied thereto. 3
02 is a delay element connected to the output terminal of the comparison amplifier 301.

303 is a D type flip-flop and a comparison amplifier 301
It is connected to the output terminal of and the P3 terminal.

An oscillation circuit 304' generates a four-channel Hz time signal.

305 is a 12-bit counter, the output of the delay element 302 is connected to the reset (R) terminal, and the output of the oscillation circuit 304 is connected to the clock (CP) terminal.

306 to 311 are O-type latches, each of which connects each data (D) terminal to each output of the 12-bit counter 305.

Furthermore, three ○ type latches 306, 307, 308
Connect the CL terminal of the D-type flipflop 303 to the output of the other three D-type latches 309, 310, 3.
The CL terminal of No. 11 is connected to the output terminal of the comparison amplifier 301. The microcomputers connected to each of these circuits include a microprocessor 312, an input/output control unit 313, a memory unit 314, and a 512-word (
1 word: 12 bits) program maple PROM3
It consists of RAM of 15 to 317 and 128 words. FIG. 4 shows an electrical wiring diagram of the advance angle value and rotational speed display section.

401 to 406 are latch decoder drivers,
Said microphone.

Connect to a computer and latch each display data,
and decode the segment LED indicators 407 to 41.
3 to display a number. The three segment LED indicators 407, 408, and 409 display the ignition advance angle in three digits, and the four segment LED indicators 410 to 413 display the engine speed in four digits. There is. However, the display 413 is designed to always display "0". Fig. 5 shows the stage for determining the number of cylinders of the engine in the second embodiment. SI during one period of the applied timing signal
It counts the ignition signal applied to the terminal.

Reference numeral 52 denotes a type latch, which is connected to the counter 511 and latches the count value immediately after the count is completed in response to a command from the S3 terminal, and the number of cylinders is obtained from the latch data.

Figure 6 is an explanatory diagram of ignition advance angle measurement, and "Q〇 is the angle of one intermittent cycle of the ignition coil.

3o is the angle from top dead center (n) to the first ignition timing (when the ignition coil is disconnected).

8o is the angle to the ignition timing before top dead center,
This angle is the ignition advance value.

FIG. 7 is a flowchart of the main program stored in PROM3!5-317.

FIG. 8 is a flowchart of a subprogram stored in PROMs 315 to 317, which is executed when interrupt 0 occurs. FIG. 9 is a flowchart of the subprograms stored in PROMs 315 to 317, which are executed when interrupt 1 occurs.
It is executed when interrupt 2 occurs in the flowchart of the subprogram stored in M315 to M317.

Next, the operation of the first embodiment with the above configuration will be explained.

This embodiment is an application of a microprocessor.
It measures and displays the engine's ignition timing and rotational speed for each revolution of the engine. In FIGS. 2 and 3, a counter 305 repeatedly counts a time signal corresponding to the time T of one revolution of the engine. This count value (corresponding to time TS) is latched by D type latches 306 to 308, and the count value corresponding to time T is latched by D type latches 309 to 311.
It's stuck on. By the way, "Microprocessor 31
2 starts executing the main program shown in Figure T at the same time as the power is turned on (step 10).
Clear COUNT “1” to 0 (step T02)
. COUNT "01" is the memory 313 for counting the pulse (TDC shown in Figure 2) that occurs once per engine revolution.
. . . COUNT III is the memory 31 for counting the ignition coil intermittent signal (IG shown in FIG. 2).
3 to 320. Next, "111r" is transferred to each digit of the display shown in FIG. 4 (step 703).
When the latch data of the decoder drivers 401 to 406 is "1111", the display becomes blank. Next, interrupts 0 and 1 are permitted (step 704). Then, the microprocessor 312 outputs the interrupt request terminals ILR0 and ILR.
Each time a pulse arrives at I, the interrupt subprograms of steps 81 to 83 shown in FIG. 8 and steps 91 to 93 shown in FIG. 9 are executed, respectively. Therefore, COUNT “0
”, the contents of COUNT “1” are the pulse TDC “
Indicates the number of arriving IGs. In step 05, COUNT
The check is repeated until "0" becomes 20.
If the engine speed is 60 pm, COUNT will take about 2 seconds.
"0" reaches 20. When COUNT "0" reaches 20, interrupts 0 and 1 are prohibited (steps 7 0 6).
, COUNT "0", and COUNT "1" are prohibited. Here, by executing step 707, the number of cylinders can be determined. Step T08} If iron N is normal, interrupt 2 is permitted in step 709, and the ignition timing and rotational speed counting subprogram (steps 101 to 10 shown in FIG. 10) is executed.
start lo6). By the way, if the electromagnetic pickup 1 to 3 that detects the top dead TDC is disconnected, the pulse TD
If C does not occur, COUNT "0" will not reach 20 and the display will remain blank.

Also, if N is 0 in step 707, the pulse IG
5. This means that N is not occurring, and N is 4.5. If the cylinder value becomes abnormal, such as a child, the pulse "TDC
, it can also be seen that nozzles and the like are operating on the IG. In this embodiment, in any case, if the TDC and IG pulse detection system is abnormal, the display does not reach step 709, so the display remains blank, notifying the observer of the abnormality. Now, when step 710 is reached, "Step 1 shown in FIG.
01 to 106, the microprocessor 312 receives a pulse (1 in FIG. 2) that arrives at the ILR2 terminal every revolution of the engine (step 101). In step 02, the contents of latches 306 to 308 are TS, latch 30
The contents T of 9 to 311 are read into the microprocessor 312. Next, step 103 is executed. In this embodiment, since there are 6 cylinders, Qo=1200. The advance angle value is calculated from the crank angle explanatory diagram (FIG. 6). “C
ONST" is a constant and "In this example, the time signal is 4Hz.
Therefore, it becomes 240,000. Although the lead angle value 8 and the rotation speed RPM calculated in step 103 are binary values, they are converted to IG Hayabusa values for display (step 104) and transferred to the display section (Figure 4) (step 105). . In the above first embodiment, the number of cylinders N was determined using the microprocessor 312, but the second embodiment will be explained with reference to FIG.

An IG pulse is applied to SI, a pulse TDC1 is applied to S2, and a pulse TDC is applied to S3. Then, the latch 52 latches the contents of the counter 51 that counts the ignition coil intermittent signal IG pulses during one rotation of the engine, so the output terminal S4
~S7, a value corresponding to 1/2 of the number of cylinders is obtained. As described above, in the present invention, the number of ignition signals detected from the ignition system of the engine is counted per unit period of a timing signal indicating a reference timing synchronized with engine rotation, and the number of cylinders is determined and stored. This has the excellent effect of automatically identifying the number of cylinders in an engine with a different number of cylinders, and eliminating the inconvenience of manually selecting the number of cylinders.

[Brief explanation of the drawing]

Fig. 1 is a basic diagram showing an embodiment of the top dead center detector attached to the engine crankshaft in the device of the present invention; Figure 3 is an electrical wiring diagram showing the main parts of the first embodiment of the device of the present invention; Figure 4 is an electrical wiring diagram of the display section in the first embodiment; Figure 5 is the main part of the second embodiment of the invention. ``Figure 6 is an explanatory diagram of the crankshaft rotation angle in the first embodiment, Figure 7 is a flowchart of the main program of the first embodiment, ``Figures 8 and 9 are an illustration of the crankshaft rotation angle in the first embodiment. The flowchart of the subprogram of the embodiment, FIG.
Flowchart of the measurement value processing program of the embodiment, 1st
FIG. 1 is an overall configuration diagram showing the configuration of the present invention. 51... Counter, 52...○ Type latch, 305
...12-bit counter, 306-311...○type latch, 312...microprocessor. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 7 Figure 10 Figure 11

Claims (1)

[Claims] 1 Targeting multiple types of engines such as 4-cylinder and 6-cylinder engines,
In an engine identification device that obtains information on the number of cylinders prior to the measurement, there is provided a means for detecting an ignition signal from an ignition system of the engine, a detector for detecting a reference timing synchronized with the rotation of the engine, and the detector. an engine identification device comprising: means for counting the number of occurrences of the ignition signal per unit cycle of the timing signal to determine and store the number of cylinders of the engine.