JPS60198375A - Ignition timing control equipment for internal- combustion engine - Google Patents

Abstract

PURPOSE:To restrict, with good response, the occurrence of knocking in selectively using regular gasoline and premium gasoline by deciding whether basic ignition timing should be switched or not and making switching control to the ignition timing in accordance with the kind of gasoline. CONSTITUTION:When a pulse signal indicating the presence of knocking at a knocking discriminating part 2 is output from a knocking sensor 1, the ignition timing is controlled so as to be delayed by an ignition timing controlling device 7 which inputs delay angle control voltage from a delay angle controlling voltage generator 3, thereby readily restricting occurrence of knocking. On the other hand, said delay angle control voltage is input into each comparator 41 and 42 in a reference ignition timing switching deciding part 4. By means of AND gates 43 and 44, which obtain logical product of the outputs from said comparators 41 and 42 and the outputs from an operation range deciding device 45, the kind of gasoline to be used can be decided, taking into consideration the reference ignition timings for premium gasoline and regular gasoline, respectively. Then, according to this decision, ignition timing is subjected to switching control by means of a reference ignition timing switching means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an ignition timing control device for an internal combustion engine.

It is well known that the octane number of gasoline has a strong correlation with knock resistance in internal combustion engines. In other words, gasoline with a high octane number is difficult to knock. Figure 1 shows the ignition timing-output shaft torque characteristics of an internal combustion engine using commercially available regular gasoline and premium gasoline (one octane higher than regular gasoline). Point A is the knock limit point when using regular gasoline, and point B is the knock limit point when using premium gasoline.If the ignition timing is operated beyond the knock limit point, knock will occur. According to Figure 5, when using premium gasoline, the ignition timing can be advanced to point 2B, so it is possible to improve the output shaft torque compared to when using regular gasoline.

In an internal combustion engine with such characteristics, when using regular gasoline and premium gasoline with RL, the engine's performance can be maximized by using the full ignition timing and changing 9J according to the type of gasoline. able to demonstrate.

〔Leverage technique〕

By the way, since the ignition timing characteristics are set only for certain gasolines, such as regular gasoline, when premium gasoline is used, the engine output cannot be expected to be the same as it is. I had to use the same method to reset the ignition timing to the advanced side. Knock Ichi Riyonjutsu (knock + u! l H drainage will be explained in detail of the present invention)? ! - Using the standard ignition timing characteristic, set it for all premium gasoline (point B in Figure 5), and when using regular gasoline, use the knock control described above to retard the ignition timing at point A in Figure 1. It is also possible. However, in this case, since the ignition timing interval (from point A to B in Figure 1), which is controlled by knock 1 lil J, is wide, if knock occurs during engine operation, the ignition will ignite. There was a problem in that a dull knock occurred during the retard control from point B to point A1, which was at a critical time.

[Summary of the invention]

Therefore, the present invention has been made in view of the above points, and it is possible to control knock by determining the type I of the gasoline used by detecting the occurrence of knock in the engine, and controlling the switching of the ignition timing characteristics of the cow according to the determination result. In addition to narrowing the ignition timing interval to increase the responsiveness of knock control to IL7J, the above judgment Tsumugi-shu No. 1d is inherited for a predetermined period of time, and indulgence is not controlled to replace 9J, thereby preventing erroneous publication. The aim is to prevent the νJ control caused by the ignition timing, and to perform the ignition timing νJ control in a timely manner.

[X example of investigation]

FIG. 2 shows one embodiment of the present invention. As shown in Fig. 2, (1) is a knock sensor that is attached to the lI pickle and can be used for all knocks in the area 1. I21 is a knock II separate ils which determines the occurrence of knock from the output No. 18 of the knock sensor, and is composed of a noise level detector (2) and a noise level detector (2) to a band pass filter.

Bandpass filter I2 Knock sensor IL+
[The output of the 0 noise level detector (2) connected to the first comparative human power and noise level detector 122 VC is connected to the comparative dI-〇 second comparative human power. be done. +33 ri is a 4-pressure generator for retardation, and the input is connected to the output of comparator l (c).
ANDGATE song, (foundation), driving mk judgment 11 timer 1Φ
, @η, 0 comparator H and comparator m (6) formed by the flip 70 knob are retarded secondary 1111 pressure generator (3
1 output 1 voltage t respectively predetermined voltage levels V1 and v2
, and their comparison outputs are connected to one input of each of the AND gate I If and the AND gate ■-. In addition, the input of the Unbarai Nagisaka Judgment is connected to the pressure sensor (5) that outputs the engine's intake nitrogen pressure and the output of the ignition timing controller (7), which will be described later, and the output is the AND gate, -. Comparison I is also connected to another input that is different from the input to which (6) is connected. ◎ AND gate I (The output of 1i is connected to the set input of flip 70 via timer IHt, and AND gate The output of ■ is connected to the reset input of the flip-flop through timer ■α'6. (7) is an ignition timing controller, and the reference ignition timing signal generator (6) outputs the reference ignition timing. Phase-shifting the timing signal according to the output of the retarded side split 4-pressure generator (3) and the output of the 7-rip 70-tube,
0 outputs an ignition signal indicating ignition timing to the ignition circuit (8)
The ignition coil (9) generates the ^4 pressure necessary for ignition of the engine.

Next, the operation of each part will be explained. Figure 3 shows the knock discrimination section (2
) indicates the operation of each part. The knock sensor fil is a generally well-known vibration acceleration anti-sensor, which is installed in a cylinder block, etc., and converts the mechanical vibrations of the engine into a signal at once, as shown in Figure 3, 1al. It outputs a vibration wave signal like this.

From the output 1d of the bandpass filter 1211i knock sensor 11), only the same wave number component of the knock signal is passed through to suppress noise components other than knock, and the S/N ratio is reduced as shown in (a) of FIG. 8tbl. No.1d full output noise level detector @ can be configured with, for example, a half-wave dual-current circuit, an averaging circuit, an amplifier circuit, etc., and a bandpass filter 1
Output No. 18 of 211 (Fig. 78 (b)) 2 Ushiwa Hime θf and averaged to the DC voltage level, amplified by a predetermined increase, ), the output signals of the bandpass filters C1 and Il (Fig. 8 [
The noise component (a) of BL also outputs a DC overpressure at a level lower than that of the knock component. Comparator l-
compares the output signal of the band pass filter φυ ((A) in Figure 43 TBL) with the output No. 1d of the noise level generator (Figure 8+1) L (B)), and if no knock occurs. (Fig. 3 o DILJ), band pass filter ≠ phantom output signal (Fig. 3 [bl (a)) (i
-4, so nothing happens, and if a knock occurs (third error), the bandpass filter I7! The output signal of υ (in Fig. 8 1bl (A υ is the noise level detector -
Since the output signal of (FIG. 3 + LSI (b)) is obtained, a pulse train is output as shown in FIG. 3 (0). Therefore, the pulse train from the output of the comparator I@ (Fig. 8 (O))
A knocking falcon can be determined based on the output level.

Fig. 4 shows the operation of the retard angle; When a pulse train like fat in FIG. 4 is output from the comparator It21, the pulse train is integrated and
Increase the output voltage as shown in step 1. box, comparison, 4It
If no pulse train is output from 21, retard control -1
The output of the pressure generator (31) is gradually lowered by a predetermined timing. That is, a voltage (T) is generated in real time to retard the ignition to the knock limit point. Then, the ignition timing control 8 or (7) manually controls the retardation control 41f.
By retarding the ignition timing by 1ttt, knocking is completely suppressed immediately.

On the other hand, the comparator V indicates the retard control output from the retard sub-coronary pressure generator 13). A(
0), outputs 1!6 levels.

Also, the comparator is set to retard control.Is the air pressure less than v2? If you can do it, it will output a high level as shown in Figure 4 + (11).
The chest guards of vl and Vs are set so that Vl>vtK. The continuous UxvA range determination device (c) receives the engine operating load information from the pressure sensor (5) and the engine operating load information by frequency-voltage conversion of the ignition signal output from the ignition timing controller (7). 22 depending on the load and rotation speed! Forming the transition area map 0 And in the reference ignition 1 cycle for premium gasoline, the retard +ff1J +il voltage does not exceed 71 when using premium gasoline, and when using regular gasoline &'! It will not be V + Sakashita)
! l! Private area α and standard ignition for regular gasoline +1
'-? A (Standard ignition timing for premium gasoline above)
(ignition timing controlled by switching to the retarded side),
A transfer range β that does not exceed 72 when premium gasoline is used and does not exceed pjv= when regular gasoline is used is set in the transfer range map.

Then, in the operation song slope judgment story), when the continuous paper flow of the engine is in the overlapping part of α and β in the above-mentioned slow rotation range, the signal of still level is fully output as shown in Fig. 4 te+. A low level signal is output in the Rengizu area other than that.

Therefore, the output of comparator U(6) and the renbutsuuta sōya' are determined.)
From IfQ, tIt at the semi-ignition timing of premium gasoline hJTh! Kashiashi-freeze of sea bream used for river gas is output.

In other words, 2° 4 figure (f) when using Regular Ganry/Chivalry
As shown in the figure, a signal of still high level is output from the AND gate knee. In addition, the n+ff buried blue AND gate between the output of the ratio V device m @4 and the output of the consecutive lie range judge -
outputs the result of 4→J Aa of the number of guns used at the standard ignition timing for regular gasoline. That is, when premium gasoline is used, a high-level signal is output from the AND gate ■ (Incorporated) as shown in FIG. 4 (8°).

Here, the fuel I1. IIJ
Knocking is likely to occur in a situation where the engine is unstable, so when using premium gasoline, the above-mentioned turning range (α
Even in [β capital], it is -1-, but the retard angle is 1 fftl.
ui 'voltage exceeds V or Vxk, 7 rip 7
There is a risk of reversing the output (to 0) and outputting an erroneous switching judgment result. At 7C, and gate IN6 or AND gate) I by timer ■(g) and timer ■1θ
If the civil power signal of I- is not output after holding Aft for more than a fixed time of Fjr, those codes will not be input to 7 lip 70 Tsubu Toto, so the 7 lip 70 Tsubu of the false judgment code which will be output as -14 will be output. All input can be prevented. Fourth
14 shows the operation of timer 1 (g), and FIG. 4 (1) shows the operation of timer 2 k. The timer (to) is II ¥11 (
T) After the elapsed time, the output of ANDGATE (goods) No. 4g outputs a high level of self until it reaches the martial level. Timer B also performs the same operation as timer I@oan in response to the output signal of AND gate ■ (Incorporated). Therefore, and gate I
(The instantaneous output signal of 1, 1 or AND gate ■- is generated by flip 70 knobs by timer ■09 and timer ■Qη.
Passage to IL is blocked. And flip 70 knob
is shown in Figure 4 (for the timer as shown in Figure 4) and timer n.
It operates with a signal that does not cause erroneous judgment due to ei, and outputs accurate information on whether or not ignition timing switching is necessary.

The reference ignition timing 'IN' unit (6) outputs a reference ignition timing signal set according to the slow rotation of lAA, that is, the rotation type or the load. This quasi-ignition timing characteristic is determined, for example, by the manufacturing characteristics of the distributor's imaginary governor and pressure diaphragm.
) In front, it is stored in memory. Then, according to the output of the 7 lip 70 knob θΦ, this semi-standard ignition timing characteristic is automatically switched to the trailing angle side when premium gasoline is used and to the retarding side when regular gasoline is used, by the ignition timing controller (7). Obtain optimal ignition timing characteristics0
The ignition timing controller (7) ρ is a known technology and will not be fully explained here.

〔Effect of the invention〕

As explained above, according to the present invention, when switching between regular gasoline and premium gasoline, a knock is detected by a knock sensor, and the timing is retarded according to the determination result of knock occurrence. By determining the safety of switching the standard ignition timing and controlling the switching according to the four electrical types of gasoline, it is possible to suppress the occurrence of knock with good response, improve the continuous transmission control performance of the ignition valve, and further improve the ignition timing. By not performing the switching operation unless the determination signal indicating whether or not timing switching is necessary continues for a predetermined period of time or longer, there is an effect of preventing ignition timing switching due to an erroneous determination of -1→.

4. The +mj14L continuation diagram in the first circle is the ignition timing vs. output shaft torque characteristic diagram of the jump, and the second
Figure 8 is a schematic drawing of flock structure 1 showing an example of the present invention.
This figure and FIG. 4 are explanatory diagrams of mfF in the example of underpowered colors in FIG. 2. In Fig. 8, (1J is a knock sensor, (2)
Knock discrimination city, 'F: 1lri late month discount! 4ton pressure generator, voltage) is the standard ignition timing switching judgment point, +51 is the pressure sensor, (6) is the reference ignition timing/No. 1 generator, (7) is the ignition timing controller, (3) is the ignition Circuit, (9) is the ignition coil ◎ Agent Masuo Ohatsu Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment (voluntary) 2 Title of invention Ignition timing control device for internal combustion engine; 3. Relationship with the person making the amendment fl 1-1- Applicant address 12-3 Higashi-cho, 9-9, Chiyo 111-ku, Tokyo
Name (601) Nisubishi Electric Co., Ltd. Representative Katayuni 8th Department 1, Agent address 2-2 Marunouchi, Chiyoda-ku, Tokyo March-5 Detailed description of the invention column 6 of the specification subject to amendment , Contents of amendment (1) The description is amended as follows.

Claims (1)

[Claims] A knock sensor that detects all knocks in an internal combustion engine, a knock determination means that determines whether knock has occurred or not based on the output of the knock sensor, and a reference ignition timing switch that determines whether or not switching of the reference ignition timing of the engine is necessary based on the output of the knock determination means. determination means, and ignition timing switching means for switching the reference ignition timing according to the output of the reference ignition timing switching determination means;
An ignition timing control device for internal combustion and internal combustion, characterized in that the J switching determination means includes a timer circuit that performs a switching operation when switching necessity determination No. 1 continues for a predetermined time or longer.