JPS58202857A - Identifier for engine - Google Patents

Abstract

PURPOSE:To eliminate inconvinience in manual selection of the number of cylinders with an automatic identification of the number of cylinders by arranging a means of detecting an ignition signal from the ignition system of the engine, a detector for detecting a reference timing synchronizing the rotation of the engine and the like. CONSTITUTION:An iron disc 12 having one salient pole is mounted on a crank- shaft 11 of an engine. An electromagnetic pick up 13 is so arranged to face the salient pole of the disc 12 when the crankshaft 11 reaches the dead point. An identifier is provided with the electromagnetic pick up 13 and coil terminals P1 and P2. Thus, a detector is constructed which detects a reference timing synchronizing rotation of the engine checking for an ignition signal from the ignition system of the engine. This enable an automatic identification of the number of cylinders of the engine thereby eliminating inconvenience in manual selection of the number of cylinders.

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 manually selected using a manual changeover switch (1) on a rotary inch or the like.

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 identification device that can automatically identify and automatically input the number of cylinders for engines with different numbers of cylinders.

The configuration of the present invention for this purpose is shown in the overall configuration diagram of FIG. In other words, the target engine is a blade engine with a number of cylinders, and includes means for detecting an ignition signal from the ignition system of the target engine, and a detector for detecting a reference timing synchronized with the rotation of this engine, and this reference timing. Information on the number of cylinders is automatically inputted by means for determining and storing the number of cylinders of the engine by counting the number of occurrences of the ignition signal per unit period of a timing signal indicating .

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

(2) Figure W41 is a configuration diagram of the top dead center detector of the engine, which constitutes a detector that detects a reference timing synchronized with the rotation of the engine. Reference numeral 12 denotes an iron disk having one salient pole, which is attached to the crankshaft 11 of the engine.

The electromagnetic pickup 13 is mounted so as to face the salient pole of the disk 12 when the engine crankshaft 11 reaches the top dead center. Pi and P2 are coil terminals of the electromagnetic pickup 13.

FIG. 2 is a voltage waveform diagram at points ■, ■, and 0.0 on FIG. 3, and the horizontal axis represents time t (sec).

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. 301
is a comparison amplifier for shaping the output of the electromagnetic pickup 13, 302 is a delay element, 303 is an IC manufactured by RCA,
D type flip-flop consisting of CD4013/2,
304 is an oscillation circuit which outputs a 40 KHz time signal i. 305□・:・1・: i;t 12 consisting of 1 from RCA IC, CD404o
Bit counters, 306 to 311 are manufactured by RCA ■ (3
) This is a D type latch made of C, CD4076.

312 is MicroProcera 4j (Toshiba T3190),
313 is an input/output control unit (Toshiba 11T3218),
314 is a memory control unit (T3416 manufactured by Toshiba), 3
15 to 317 are implemented as FROM (Toshiba 11TMM121) with 512 words (1 word - 12 bits).

318 to 320 are RAM (Toshiba TMM111) 1
28 words are implemented.

FIG. 4 is an electrical wiring diagram of the advance angle value and rotational speed display section of the first embodiment of the present invention. 401 to 406 are −latches・
Decoder driver (RCA IC, CD451
1). 407-413 are segment LED indicators. The three numbers 407 to 409 display the advance angle value in three digits, and the four numbers 410 to 413 display the rotation speed in four digits.

However, 413 is designed to always display "0".

Figure 5 shows a second embodiment of the means for determining the number of cylinders in an engine. Note that 51 is an IC manufactured by RCA.

CD4040), 52 is a D type latch (RcA(4)
) is a company-made IC, CD4042).

FIG. 6 is an explanatory diagram of ignition advance angle measurement, where α° is one intermittent cycle angle of the ignition coil. β° is top dead center (TDC)
This is the angle from the end to the first ignition timing (when the ignition coil is disconnected). θ° is the angle to the ignition timing before top dead center, and this angle is the ignition advance value.

FIG. 7 is a flowchart of the main program stored in FROM 315-317.

FIG. 8 is a flowchart of subprograms stored in PROMs 315 to 317, which are executed when interrupt 0 occurs.

FIG. 9 is a flowchart of subprograms stored in PROMs 315 to 317, which are executed when interrupt l occurs.

FIG. 10 is a flowchart of a subprogram stored in PROMs 315 to 317, which is executed when interrupt 2 occurs.

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

This example uses a micropro sensor (5), and controls the engine's ignition timing and engine speed.
It measures and displays each rotation. Figures 2 and 3
In the figure, a counter 305 repeatedly counts a time signal corresponding to the time T of one revolution of the engine. This needle value (equivalent to time TS) is D type launch 306 to 308.
The count value corresponding to time T is latched in D-type latches 309 to 311. By the way, the microprocessor 312 starts executing the main program shown in FIG. 17 at the same time as the power is turned on (step 7o1).

Next, clear C0UN rOJ and C0UN rlJ to 0.
J is a pulse generated once per engine revolution (T shown in Figure 2)
C0UNT rIJ is a variable on the memories 313-320 for counting the ignition coil intermittent signal (IG shown in FIG. 2). Next, “1111” is displayed in each digit as shown in Figure 4.
(Step 703). latch decoder
Drivers 401 to 406 have latch data “1111”
'', the display becomes blank. Next, interrupt 0.1 is enabled (step 704). Then, the microprocessor 31
2 executes the interrupt subprograms of steps 81 to 83 shown in FIG. 8 and steps 91 to 93 shown in FIG. 9, respectively, each time a pulse arrives at the interrupt request terminals ILRO and ILR1. Therefore, C0UNT roj , C0UNT
The contents of rlJ indicate the number of arriving pulses TDC and IG, respectively.

Sf 7” 705 Te4t COU N T r
OJ Ka20 If the engine speed is 60 rpm, it will reach C in about 2 seconds.
0UNT "0" reaches 20. When C0UNT rOJ reaches 20, interrupt 0.1 is disabled in step 7.
06) , C0UNT rOJ , C0YNT rlJ
Prohibits counting operation. Here, by executing step 707, the number of cylinders can be determined. If N is normal in step 708, interrupt 2 is permitted in step 709, and the ignition timing and rotation speed measurement subprogram (steps 101 to 106 shown in FIG. 10) □□6° □・1・ (7) By the way, if the electromagnetic pickup 13 that detects the TDC in the upper row does not generate pulse TDC due to a disconnection, etc., the C
PUNTrOJ does not reach 20 and the display remains blank. Further, if N is 0 in step 707, it means that pulse IG is not generated, and if N becomes an abnormal value as a cylinder numerical value such as 4.5.5.5,
It can also be seen that the nozzles, etc. are operating on pulse, TDC, and IG. In this embodiment, TDC, IG
If the pulse detection system is abnormal, it will not reach step 709 and the display will remain blank to notify the observer of the abnormality. Now, when step 710 is reached, the process moves to steps 101 to 106 shown in FIG. 10, and the microprocessor 312 receives a pulse (IGI shown in FIG. 2) that arrives at the ILR2 terminal every revolution of the engine (step 10
1). In step 102, the contents T of the TS1 latches 309-311 of the lunches 306-308 are read into the microprocessor 312. Next, step 103 is executed. In this example, since there are 6 cylinders, (8) α''=120°. From the crank angle explanatory diagram (Figure 6), the advance angle value θ is calculated. “C0N5T” is a constant;
In this example, the time signal is 40KHz, so 24,000
It becomes 0. Although the lead angle value θ and the rotation speed RPM calculated in step 103 are binary values, they are converted to decimal values for display (step 104) and transferred to the display unit (FIG. 4) (step 105).

In the above first embodiment, the number N of cylinders was determined using the microprocessor 312, but a second embodiment will be explained with reference to FIG. An IG pulse is applied to Sl, a pulse TDCI is applied to S2, and a pulse TDC is applied to S3. Then,
The latch 52 has an ignition coil intermittent signal IG during one revolution of the engine.
Since the contents of the counter 51 that counted the pulses are latched, a value corresponding to 1/2 of the number of cylinders is obtained at the output terminals S4 to S7.

As described above, in the present invention, the number of cylinders is determined by counting the number of ignition signals detected from the ignition system of the engine (9) per unit period of a timing signal indicating a reference timing synchronized with engine rotation. Since it is memorized, it is possible to automatically identify the number of cylinders of an engine with a different number of cylinders, which has the excellent effect of eliminating the inconvenience of manually selecting the number of cylinders.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the top dead center detector attached to the engine crankshaft in the device of the present invention, Fig. 2 is a timing waveform diagram of each part to explain the operation of the device shown in Fig. 3, and Fig. 3 4 is an electrical wiring diagram showing the main parts of the first embodiment of the device of the present invention, FIG. 4 is an electrical wiring diagram of the display section in the first embodiment, and FIG. 5 shows the main parts of the second embodiment of the invention. 6 is an explanatory diagram of the crankshaft rotation angle in the first embodiment, FIG. 7 is a flowchart of the main program of the first embodiment, and FIGS. 8 and 9 are diagrams of the 181st embodiment. FIG. 10 is a flowchart of the subprogram, FIG. 10 is a flowchart of the measured value processing program of the first embodiment, and FIG. 11 is an overall configuration diagram showing the configuration of the present invention. (10) 51...Counter, 52...D type latch, 3
05...12-bit counter, 306-311...
- D type launch, 312... microprocessor. Representative patent attorney Takashi Okabe (11) Fig. 3 5v Fig. 4 5V rpm Fig. 5 Fig. 6 325- Fig. 7 Rod 81'4 Fig. 10

Claims (1)

[Scope of Claims] In an engine identification device that targets multiple types of engines such as 4-cylinder and 6-cylinder engines and obtains information on the number of cylinders prior to measurement, means for detecting an ignition signal from the ignition system of the engine. a detector for detecting reference timing synchronized with the rotation of the engine; and means for counting the number of occurrences of the ignition signal per unit period of the timing signal from the detector to determine and store the number of cylinders of the engine. Institutional identification device with and.