JPH02140462A - Ignition timing controller for engine - Google Patents

Abstract

PURPOSE:To arrange so as to obtain an excellent acceleration feeling, by providing a speed step detecting means which detects that the speed step of a transmission is set at 1 speed, and a means which controls an ignition timing according to a 1 speed angle advance characteristic. CONSTITUTION:A speed step detecting sensor 2 detects that the speed step of a transmission is set at 1 speed. Both the output signals S1, S2 of a pulse generator 1 and the output signal of a speed step detecting sensor 2 are inputted into a controller 3. In the case of 1 speed having been detected by means of the speed step detecting sensor 2, the controller 3 controls an ignition timing according to a 1 speed angle advance characteristic. Thus, an excellent acceleration feeling can be obtained without conducting a troublesome accelerating regulation at the time of travel at 1 speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for controlling the ignition timing of an engine.

[Conventional technology]

As is well known, a vehicle engine has ignition I1. ? Equipped with period adjustment means. This ignition timing adjustment means has the function of advancing the ignition timing (13) at high engine speeds to improve the output of the engine.

(Problems to be Solved by the Invention) By the way, a high-output engine is mounted on a vehicle such as a two-wheeled vehicle for business purposes. Such vehicles require the highest engine output when driving in a high-speed gear, and also require relatively high engine output for acceleration when a medium-speed gear is selected. shall be. On the other hand, engine output is not required as much when starting or driving around a sharp curve when first gear is used.

Conventional ignition timing adjustment means does not have the function of suppressing engine output when the first gear A7 is used, so in the race vehicles mentioned above, the engine output becomes excessive when driving in the first gear, and therefore the accelerator A good acceleration feeling could not be obtained unless the opening degree was adjusted well.

[Means for Solving the Problem] In the present invention, in an engine ignition timing control device that controls ignition timing according to a predetermined advance angle characteristic, it is detected that the speed gear of the transmission is set to the first gear. speed stage detection means; means for setting a first speed advance characteristic for suppressing the output of the engine; and a means for setting a first speed advance characteristic when the first speed is detected by the speed stage detection means. and means for controlling the ignition timing according to the ignition timing.

[Effect]

According to the above configuration, when the speed stage is the first speed, the ignition timing is controlled according to the advance angle characteristic for one series, thereby suppressing the output of the engine.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an ignition timing control device according to the present invention applied to a four-cylinder engine.

In the figure, the pulse generator 1 is configured such that the crankshaft of an engine (not shown) is connected at a preset minute angle (for example, 1
°) The pulse signal S1 shown in Fig. 3 (a) is output every time the crank angle rotates, and the pulse signal S1 shown in Fig. 3 (b) is output every time the crank angle reaches an angle θ0 (for example, 45°) before the above point angle. The reference timing signal S2 shown in FIG.

The above-mentioned pulse generator 1 is well known and is composed of, for example, a disk rotated by a crankshaft and an electromagnetic pickup that converts magnetic changes into electrical signals based on slits formed on the periphery of the disk. be done.

The speed detection sensor 2 is provided to detect that the speed stage of a transmission (not shown) is set to 1st speed, and detects, for example, a limit activated when the shift lever is operated to the 1st speed position. Consists of switches, etc.

The output signal S1°S2 of the pulse generator 1 and the output signal of the speed stage detection sensor 2 are both manually input to the controller 3.

The memory 4 stores two types of advance angle characteristics as illustrated in FIG. 1st speed advance angle characteristic B that is applied when set is stored.

As shown in the figure, the advance angle on advance characteristic B has a larger value of f than the advance angle on advance characteristic A in a region where the engine speed is N (for example, 2300 rpm) or higher.

FIG. 2 shows an example of a processing procedure executed by the controller 3.

In this procedure, first, based on the output signal S1 of the pulse light generator 1, processing power is executed to calculate the current engine rotation speed (step 100).In other words, the number of occurrences of the pulse signal S1 within a unit time is Based on this, the engine speed is calculated.

Next, it is determined whether the pulse generator 1 has outputted the timing signal S2 shown in FIG. 3(b) (step 1).
01), and if the determination result is No, the procedure returns to step 100.

Also, if the judgment result in step 101 is YES,
Counting of the pulse signal S1 is started (step 102>), and it is determined whether the speed gear is set to 1st gear based on the output of the speed gear detection sensor 2 (step 103).

In step 103, if it is determined that the speed gear is not 1st gear, that is, if a speed gear higher than 2nd gear has been determined, the engine rotation speed detected in step 100 and stored in the memory 4 are Based on the characteristic A shown in FIG. 4, the advance angle Ox on the characteristic A that matches the current engine speed is read out from the memory 4 (step 104).
.

On the other hand, if it is determined in step 103 that the speed stage is set to 1st gear, the advance angle θX on characteristic B that matches the engine speed is detected from the memory 4 (step 105).

In the next step 106, the angle θ0 shown in FIG.
The calculation θ0 - θX is executed to subtract the advance angle θX obtained in step 103 or step 104 from θ0−θX, and the calculation result is shown in FIG. The count value represents the rotation angle of the crankshaft from the time when the signal S2 shown in FIG. 3(b) is generated.

In step 107, the count value is
It is determined whether the size corresponds to the adjustment θ4 calculated in . Then, when the determination result becomes YES, that is, when the crank angle is advanced by θX from the above point position, the negative polarity signal S3 shown in FIG. 3(C) is output ( Step 108).

When the signal S3 is output, the switch element 5 such as a power transistor that has been closed until then (see Fig. 1)
is cut off, which induces a high voltage on the secondary side of the ignition coil 6. This high voltage is then ignited, for example, to the ignition plug of the second cylinder of the engine, thereby igniting the ignition plug.

Note that the energization period T of the switch element 5 is appropriately set based on the voltage value of the battery 7 and the engine rotation speed. That is, the lower the voltage of the battery 7, the longer the period T is set, and the lower the engine speed, the shorter the period T is set.

Thus, according to this embodiment, when the speed gear is set to 2nd gear or higher, the ignition timing is set according to the advance angle characteristic A shown in FIG. 4, and when the speed gear is set to 1st gear. In this case, the ignition timing is set according to the advance angle characteristic B shown in the figure.

The above-mentioned characteristic A is set so that a good engine output characteristic is subtracted by 1:1. Therefore, when characteristic B, which has a smaller advance angle (retard angle) than characteristic A, is applied, the engine output decreases. As a result, in the above example,
If the engine output characteristic when the second gear or higher is set is as shown in a in FIG. 5, then the output characteristic in the first gear is as shown in b.

That is, in the first gear, the engine output in a predetermined engine speed range is lower than when using other speed stages.

In the above embodiment, the engine output in 1st gear is suppressed by using the advance angle characteristic exclusively for 1st gear. By setting the angular characteristics individually and using them selectively according to the applicable speed stage, the output characteristics a, as illustrated in FIG.
b, c and d can be obtained.

Of course, in this case, it is necessary to provide a speed stage for detecting that each speed stage is set.

In the above embodiment, the ignition timing is set using purely electronic means, but it is also possible to set the ignition timing using other means.

For example, by installing an actuator (for example, a pulse motor) for changing the advance angle in a conventional governor-type advance mechanism, and operating this actuator according to the characteristics A and B shown in Fig. 4, the desired ignition timing can be set. It is also possible to do so.

[Effects of the Invention] According to the present invention, engine output can be suppressed when the speed gear is set to 1st gear, so good acceleration can be achieved without having to make troublesome accelerator adjustments when driving in 1st gear. You can get the feeling.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the ignition timing control device according to the present invention, FIG. 2 is a flow chart showing an example of the 118 procedure executed in the controller shown in FIG. 1, and FIG. FIG. 4 is a time chart illustrating the contents of advance angle control, FIG. 4 is a graph illustrating an example of advance angle characteristics, and FIGS. 5 and 6 are graphs each illustrating engine output characteristics. 1...Pulse generator, 2...Speed stage detection sensor, 3
...Controller, 4.Memory, 5.Switch element, 6.Ignition coil, 7.Battery. Figure 1 Figure 3

Claims (1)

[Scope of Claims] An ignition timing control device for an engine that controls ignition timing according to a predetermined advance characteristic, comprising: a speed stage detection means for detecting that a speed stage of a transmission is set to first speed; means for setting a first gear advance characteristic for suppressing engine output; and means for controlling ignition timing in accordance with the first gear advance characteristic when the first gear is detected by the speed detecting means. An engine ignition timing control device comprising: