JPH0299764A - Ignition timing controller - Google Patents

Abstract

PURPOSE:To prevent the variation of the ignition timing by carrying out the start delayed angle estimation with the cycle between two standard signals on the advance angle side and delayed angle side of the output of a signal coil and carrying out the initial ignition by the standard signal on the delayed angle side and carrying out the advance angle estimation from the standard signal on the advance angle side. CONSTITUTION:The output signal supplied from a signal coil 1 forms two standard signals on the advance angle side and delayed angle side in an input circuit 2, and the cycle Tp between the standard signals is obtained by an input timer 4 and temporarily stored into a RAM 9. A CPU 3 estimates the start delay angle of the ignition timing characteristic on the basis of the data, and the revolution speed at each moment is obtained, and the ignition timing control having high precision is carried out. Further, the ignition timing characteristic A is obtained by carrying out the initial ignition from the standard signal on the delayed angle side of the output of the signal coil 1, and the ignition timing characteristic C is obtained by carrying out the advance angle estimation from the standard signal on the advance angle side. Thus, the ignition timing having high precision can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nine-ignition timing control device, and particularly to an ignition timing control device that can obtain highly accurate ignition timing.

[Prior Art] Fig. 3 is a block diagram showing a schematic configuration of an ignition timing control device controlled by a microcomputer. In Fig. 6, (1) shows an engine signal coil, and (2) shows an engine signal coil (1). (3) is a CPU consisting of a microprocessor; (4) is an input timer connected to the input circuit (2); (5) is an output timer.

<6) is an input board that is connected to various input circuits.

(7) is a timer, (8) is a ROM that stores various calculation programs, tables, etc. in advance, (9) is a RAM that stores various input/output data, (11) is an output timer (5) This is an output circuit connected to the output circuit, which consists of power transistors, etc. (12) is the output circuit (11
) and the ignition coil connected to it.

(13) is a spark plug that ignites the engine by causing the high voltage generated on the secondary side of the ignition coil to ignite.

In addition, the CPU (3), input timer (4), output timer (
5), input board (6), timer (7), ROM (8)
, RAM (9) are mutually connected via a bus (10), and constitute a microcomputer.

FIG. 4 is a diagram showing conventional operating waveforms.

A conventional ignition timing control device is constructed as described above, and a signal as shown in FIG. 4(a) is output from the signal coil (1). The input circuit (2) forms reference signals for the advance side and the retard side, and the input circuit (2) forms the reference signals for the advance side and the retard side, and sends them to the RAM (
9) - Store temporally. Based on this reference signal on the advance side, the CPU (3) predicts the ignition advance angle as shown in FIG. A conventionally known ignition operation is performed to generate a high voltage on the secondary side of the ignition coil (12) and ignite one spark plug (13). Further, at the initial time, the CPU (3) controls the ignition timing using the reference signal on the retard side so as to perform initial ignition as shown in FIG. 4(b).

[Problem to be solved by the invention] In the conventional ignition timing control device as described above.

Since the ignition timing is predicted from the advance side, the instantaneous rotational speed cannot be measured, so there is a problem in that the ignition timing changes when the rotation changes.

The present invention was made to solve this problem, and an object of the present invention is to provide an ignition timing control device that can obtain highly accurate ignition timing.

[Means for Solving the Problems] An ignition timing control device according to the present invention includes a signal coil, a microcomputer having an input/output circuit, a memory circuit, and an ignition timing control circuit. The timing control circuit performs a start retard prediction using the period between the two reference signals on the advance side and the retard side of the output of the signal coil, performs initial ignition using the reference signal on the retard side, and adjusts the advance angle. The advance angle is predicted based on the side reference signal.

[Function] In the present invention, the CPU performs start retard prediction using the period between two reference signals on the advance side and the retard side of the output of the signal coil, performs initial ignition using the reference signal on the retard side, and starts the advance. Advance angle prediction is performed from the reference signal on the corner side.

[Embodiment] FIG. 1 is a diagram showing operating waveforms according to an embodiment of the present invention.

FIG. 2 is a diagram showing the ignition timing characteristics of the present invention.

The schematic structure of the ignition timing control device is the same as that shown in FIG. 3 above. In Fig. 3, the signal coil (1) generates an output signal as shown in Fig. 1 (a).The input circuit (2) generates the lead angle side and the retard angle side shown in Fig. 1 (b). The period Tp between the reference signals is determined by an input timer (4) and is temporally stored in the RAM (9).The CPU (3) uses this data to determine the period Tp between the reference signals. Figure 2 (B
) By predicting the starting retardation of the ignition timing characteristics shown in ), it is possible to measure the instantaneous rotational speed.

Highly accurate ignition timing can be obtained. Also.

The ignition timing characteristic shown in (A) in Fig. 2 is as described above.
The PU (3) is obtained by performing initial ignition from the reference signal on the retard side of the output of the signal coil (1), and the ignition timing characteristic shown in (C) in Fig. 2 is obtained by performing the initial ignition from the reference signal on the retard side of the output of the signal coil (1).
This is obtained by performing advance angle prediction from the reference signal on the advance side of the output in 1).

[Effects of the Invention] As described above, the ignition timing control circuit of the present invention has the following features:
Starting retard prediction is performed using the period between two reference signals on the advance side and retard side of the output of the signal coil, initial ignition is performed using the reference signal on the retard side, and advance is performed from the reference signal on the advance side. Since the ignition timing is controlled to predict the angle, 21
It has the effect of providing a highly accurate ignition timing and stabilizing the retard angle when in manual mode.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an operational waveform diagram according to an embodiment of the present invention; FIG. 2 is an ignition timing characteristic diagram of the present invention; and FIG. 3 is a schematic configuration diagram of an ignition timing control device controlled by a microcomputer. FIG. 4 is a conventional operation waveform diagram. In the figure, (1) --- Signal coil, (2) Input circuit, (3) --- CPU, (5) --- Output timer, (1
2)...Ignition coil, (13)...Spark plug. In addition, the same reference numerals in each figure indicate the same parts or ζ.

Claims (1)

[Claims] In an ignition timing control device comprising a signal coil, a microcomputer having an input/output circuit, a memory circuit, and an ignition timing control circuit, the ignition timing control circuit controls the output of the signal coil on an advance side and a retard side. An ignition system characterized in that starting retard prediction is performed using the period between two reference signals, initial ignition is performed using the retard side reference signal, and advance angle prediction is performed from the advance side reference signal. Timing control device.