JP3043442B2 - Ignition signal distribution device in a device with static high voltage distribution - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a microcomputer for generating an ignition signal and an address signal, and a decoder for sending a control signal as an output signal to the final stage of the ignition. The present invention relates to an ignition signal distribution device in a device having a static high-voltage distribution device, which determines which of the ignition end stages the ignition signal is switched to in each case.

[0002]

2. Description of the Related Art Ignition signal distribution devices for devices having a static high-voltage distribution device in internal combustion engines are known. The device has a microcomputer for generating an ignition signal and an address signal, in which case the address signal determines to which of the downstream connected ignition stages the respective ignition signal is to be connected, Are provided with three address lines, which are connected to a decoder, which sends out control signals as output signals to the final stage of ignition. The temporal assignment relationship of the signals is determined by the microcomputer based on the information of the rotational speed signal applied and applied.

In the event of a possible fault in the speed signal itself, the microcomputer loses synchronization during the application of the ignition signal, whereby the address changes suddenly on the address line as a result of the fault. This results in a misfire both at the end of ignition controlled by the previous address and at the end of ignition controlled by the new address. At the last ignition stage controlled by the previous address, the ignition occurs at the wrong ignition timing, i.e. too early, whereas at the last ignition stage controlled by the new address, the ignition occurs completely off. These misfires can cause strong knocking which in extreme cases can cause engine damage.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to avoid an ignition mistake caused by such an undesired address change.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a microcomputer in which an address signal is supplied to a flip-flop component, which receives the address signal during a firing time of the ignition signal, and outputs the address signal. The problem is solved by an arrangement in which the signal is stored at least during the firing time of the ignition signal and supplied to the decoder as an address signal applied in a stored constant state.

[0006]

According to the present invention, an address signal generated by a microcomputer is supplied to a flip-flop component via an address line, and the flip-flop generator outputs the address signal during an ignition signal input time. To receive. If the microcomputer is newly synchronized within the open time, any change in address during the open time will not lead to a misfire. The received ignition signal is stored at least during the firing time of the ignition signal, and further supplied to the decoder as a stored address signal. This intermediate storage of the address signal during the turn-on time does not result in a misfire because incorrect address changes during the turn-on time are not received by the flip-flop component. This is because the address signal received during the turn-on time is constantly applied to the decoder during the turn-on time. As described above, the failure of the rotation signal or the change of the address during the input time does not affect the address signal which is temporarily stored and applied to the decoder. In this way, ignition errors due to address changes due to faults during the closing time are eliminated and knocking harmful to the engine is avoided.

In a further advantageous embodiment of the invention, the address signal generated by the microcomputer is received by the flip-flop component in the following manner, precisely synchronized with the respective ignition signal. That is, reception and synchronization are performed on the rising edge of the respective signal.

[0008]

FIG. 1 shows a block diagram of an ignition signal distribution device 1 together with a microcomputer 2, a flip-flop component 3 and a decoder 4.

A rotation speed signal D is connected to the microcomputer 2 as an input signal for the time distribution of the ignition signal for operating the engine.

An ignition signal Z is generated from the microcomputer 2 as follows depending on the rotation speed signal D. That is, the signal is generated such that a substantially rectangular signal or a trapezoidal signal is transmitted over a predetermined time having Z = 1 (hereinafter referred to as an input time). The time intervening between these charging times is Z = 0 and is hereinafter referred to as open time. The ignition signal Z is supplied to both the flip-flop component 3 and the decoder 4.

Further, by the microcomputer 2, 3
An address signal is generated via one address line and supplied to the flip-flop configuration unit 3 (triple D type). The address signals on the three address lines A0, A1, and A2 are digitally transmitted in a three-digit code. For example, 000; 100; 010 and the like.

The transfer, reception, and intermediate storage of the address signal generated by the microcomputer 2 by the flip-flop constituting section 3 will be described in detail below with reference to the time chart of FIG.

From the flip-flop configuration unit 3, another 3
Two address lines X0, X1, and X2 are connected to the decoder 4, and an address signal stored in the same manner as the three-digit code is supplied to the decoder 4 on this line. For example, a decoder configured as a “3: 8 line decoder” converts the intermediately stored address signal into eight control signals Y1 to Y8 for the final stage of ignition for an eight-cylinder engine. Next, a function table of the decoder is shown.

[0014]

[Table 1]

FIG. 2 shows a time chart of an ignition signal distribution device which does not perform intermediate storage of an address signal according to the present invention.

In the uppermost column, address signals A0, A1,
The time lapse of A2 is shown, in which case it is analogous to the previously described function table of the decoder (in this case X0, X1,
A0, A1, and A2 can be used directly instead of the value of X2. Control signal Y3 is used for address signal 010, control signal Y4 is used for address signal 011, control signal Y5 is used for address signal 100, and control signal Y5 is used for address signal 000. Signal Y1
Has been assigned. Approximately in the middle of the time course of the address signal, an ignition signal Z = 1 is generated, which is simultaneously generated as a control signal Y3, Y4, etc. via the corresponding assigned address. The ignition itself is based on the alternation of signal edges (Y
This occurs when 1 to Y8 is 1 → 0). Control signals Y1 to Y8
Exists only when Z = 1, that is, during the aforementioned dosing time. When Z = 0, all control signals Y1 to Y1
Y8 is also 0. The latter corresponds to the aforementioned opening times.

In the first column of address signals A0, A1, A2, a fault S occurs during correct control by signal 100, which causes an address change to control signal 000. This causes the following: That is, when the fault S occurs, the control signal Y5 becomes 0, and the subsequent signal edge alternation triggers early ignition and an ignition error based on the early ignition. At the same time, the control signal is Y1 =
1 caused by an incorrect assignment, the control signal
During the alternation of the signal edge to 1 = 0, a misfire FZ occurs at a time which is completely unsuitable for the associated cylinder.

On the other hand, FIG. 3 shows address signals A0, A1, A2 generated by the microcomputer.
Is received in the flip-flop component 3 and stored intermediately according to the invention. The following can be seen from the time chart of FIG. That is, the reception and storage of the address signals A0, A1, A2 generated by the microcomputer 1 are performed each time the signal edge of the ignition signal Z rises. The intermediately stored address signals X0, X1 and X2 are respectively held over the time when the ignition signal Z is turned on and the subsequent open time, and are applied to the decoder 4 over the time.

FIG. 3 shows a similar fault S in the time domain of the address signal 100 in the address signals A0, A1, A2. With the address 100 already received and stored in the flip-flop component, the fault S to the address change 000 for the decoder 4 is prevented,
In this way, the correct control signal Y5 is now controlled over the entire make-up time, so that ignition takes place at the correct ignition timing at the alternation of the signal edge to Y5 = 0.

[0020]

According to the present invention, by intermediately storing the address signal during the closing time, an erroneous address change during the closing time is not received by the flip-flop component, so that no ignition error occurs. This is because the address signal received during the turn-on time is applied to the decoder in a constant state at least during the turn-on time. The failure of the rotation signal or the change of the address during the input time does not affect the address signal intermediately stored and applied to the decoder as described above. In this way, ignition errors due to address changes due to faults during the closing time are eliminated and knocking harmful to the engine is avoided.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an ignition signal distribution device.

FIG. 2 is a time chart of a conventional ignition signal distribution device that does not perform intermediate storage of an address signal.

FIG. 3 is a time chart of an ignition signal distribution device that performs intermediate storage of an address signal according to the present application.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ignition signal distribution device 2 microcomputer 3 flip-flop component 4 decoder

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eckbert Perenteraler Stuttgart, Germany 80 Feldbergstrasse 82 (56) References JP-A-2-275065 (JP, A) JP-A-56-56970 (JP, A) ) Japanese Utility Model 3-17286 (JP, U) JP 2-28710 (JP, B2) JP 2-53628 (JP, B2) JP 2-20816 (JP, B2) JP 7- 51936 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02P 1/00-17/12

Claims (3)

(57) [Claims] 1. A microcomputer (μc) for generating an ignition signal (Z) and an address signal (address lines A0, A1, A2), and control signals (Y1 to Y8) as output signals are sent to the final stage of ignition. and a decoder (4) for the address signal is one that defines whether switch which in each case an ignition signal of the ignition output stages which are connected downstream (Z), the static high-voltage distributor In the ignition signal distribution device in the device having the above, the address signal (address lines A0, A1, A2) generated by the microcomputer (2) is flipped.
Is supplied to the flop component (3), the flip-flop component (3) is an address signal (address lines A0, A1, A2) during the on time of the ignition signal
Receiving the address signal at least when the ignition signal is turned on.
Ignition in a device having a static high-voltage power supply, which is stored throughout and supplied as an address signal (address lines A0, A1, A2) applied in a stored constant state to a decoder (4). Signal distribution equipment. 2. A flip-flop from a microcomputer.
-Up component to (3) three address lines (A0, A1,
2. The ignition signal distribution device according to claim 1, wherein A2) is used and three address lines (X0, X1, X2) are used correspondingly from the flip-flop component (3) to the decoder (4). 3. An address signal (address lines A0, A1, A1 ) generated by a microcomputer (2) .
2), the flip-flop component (3) by being received territory on the rising edge of the ignition signal (Z) in each case, the ignition signal distribution apparatus of claim 1 or 2, wherein.