JPH04164155A - Ignition device for engine - Google Patents

Abstract

PURPOSE:To carry out shift operation in the sharp acceleration speedily and smoothly by delaying the ignition timing by a prescribed time or by a prescribed number of revolution by an ignition timing control means with detection of a shift-up detecting means, in an ignition device for a motorcycle engine for motocross. CONSTITUTION:When the number of revolution of an engine 1 is, for example, over 10,000rpm, and a shift pedal 11 is to be operated to shift-change a speed change gear 10 to a high speed side, a shift-up sensor 17 is turned on, and at the same time, an ignition timing control means 9 delayed-angle-controls the ignition timing of the engine 1 to reduce the output of the engine 1. In this delayed angle control, the ignition timing control is carried out only by a prescribed time or by a prescribed number of revolution. The prescribed time is set by the built-in timer of an ignition timing control means 9, and the prescribed number of revolution is detected by an engine revolution speed detection sensor 15. The output is reduced by delaying the ignition timing of the engine 1 simultaneously with the operation of the shift-up sensor 17, and the shift operation of the speed change gear 10 is carried out speedily and smoothly with out perfectly returning a throttle in the sharp acceleration.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an engine ignition device, and more particularly to an engine ignition device that retards ignition timing to quickly and smoothly shift a transmission. .

[Prior Art] For example, an engine mounted on a motorcycle is equipped with a transmission, and by means of a shift operation means such as a shift pedal,
There are some that shift up to high speed and downshift to low speed depending on the driving condition.

Normally, in order to perform a smooth shift operation on a motorcycle traveling on-road, the throttle is returned at the same time as the clutch is operated to lower the engine output, and then the upshift operation is performed. By the way, in motorcycles used for motocross riding, for example, in order to avoid the trouble of having the rider operate the clutch and throttle, the rider does not operate the clutch during sudden acceleration, and moreover, the throttle is barely released before shifting up. There is something to do.

[Problem to be solved by the invention] In this way, especially in motorcycles for motocross driving,
If you shift up to a high speed side without returning the throttle during sudden acceleration, the load on the change mechanism of the transmission will be large and the shift operation will be difficult, so you may not be able to perform a quick and smooth shift operation.

The present invention has been made in view of the above circumstances, and provides an engine ignition device that allows quick and smooth shift operations by controlling engine ignition timing without changing the transmission change mechanism. It is intended to.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the engine ignition device of the present invention provides an engine ignition device for an engine equipped with a shift operation means for upshifting or downshifting a transmission. The engine is characterized by having an upshift detection means for detecting an upshift, and an ignition timing control means for retarding the ignition timing of the engine by a predetermined time or a predetermined number of revolutions upon detection of the upshift.

[Operation] In the present invention, when the operating means shifts up the transmission, the shift-up detection means detects this shift-up, and the ignition timing control means adjusts the ignition timing of the engine for a predetermined time or a predetermined number of revolutions. only to retard it. By retarding the ignition timing, engine output decreases when the throttle is completely released during sudden acceleration, which reduces the load on the transmission change mechanism, allowing for quick and smooth shifting. can.

[Example] Next, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a motorcycle engine to which an embodiment of the present invention is applied, FIG. 2 is a diagram showing the relationship between engine speed and ignition timing, and FIG. 3 is a diagram of an ignition system for an engine according to the present invention. It is an operation flowchart.

Reference numeral 1 in the figure is an engine mounted on, for example, a motocross motorcycle, and a spark plug 3 is provided in the upper part of a cylinder 2 of the engine 1. An exhaust pipe 4 is connected to the front side of the cylinder 2, and an intake pipe 5 is connected to the rear side, and a carburetor 6 is connected to the intake pipe 5. The carburetor 6 is equipped with a throttle valve 7, and the amount of air-fuel mixture supplied to the engine 1 is controlled by the opening degree of the throttle valve 7. The opening degree of the throttle valve 7 is detected by the throttle opening detection means 8, and this throttle opening information is sent to the ignition timing control means 9.

The engine 1 is provided with a transmission 10, and the transmission 10
A shift operation such as upshifting to a high speed side or downshifting to a low speed side is performed by rotating a shift operation shaft 12 with a shift pedal 11, and these constitute a shift operation means. When the shift pedal 11 is operated downward, a downshift occurs, and when the shift pedal 11 is operated upward, a shift is made. A magneto 14 is provided on the crankshaft 13 of the engine 1, and an engine speed detection sensor 15 is provided to detect the engine speed from the rotation of the crankshaft 13. This engine speed information is sent to the ignition timing control means 9. and controls the ignition coil 16.

The ignition timing control means 9 applies a high voltage to the ignition coil 16 based on the throttle opening degree and engine speed to spark the ignition plug 3, thereby obtaining basic ignition timing characteristics as shown by the solid line in FIG.

A shift up sensor 17 is provided near the shift pedal 11. The shift up sensor 17 has a predetermined distance from the shift pedal 11, and when the shift pedal 11 has play and the shift pedal 11 starts to be moved, the shift up sensor 17 turns ON. When this shift-up sensor 17 is turned on, the ignition timing control means 9 retards the ignition timing of the engine 1 by a certain angle as shown by the dotted line a in FIG. to a predetermined angle.

In this case, the retard control is performed to adjust the ignition timing by a predetermined time or a predetermined number of revolutions. By doing this, the ignition timing is controlled only as long as necessary for the shift operation, and the ignition timing is otherwise controlled according to the normal basic ignition timing characteristics, so that engine performance is not impaired.

Note that the predetermined time is set by a timer (not shown) built into the ignition timing control means 9. Further, the above-mentioned predetermined rotational speed is detected by the engine rotational speed detection sensor 15.

In this way, by retarding the ignition timing of engine 1,
During sudden acceleration, the output of the engine 1 is reduced without returning the throttle at all, thereby reducing the load on the change mechanism of the transmission 10, allowing a quick and smooth shift operation.

This ignition timing control will be explained based on FIG. 3.

In step a), it is determined whether the rotational speed of the engine 1 is, for example, 10,000 rpm or more, and if the rotational speed is higher than this rotational speed, it is determined whether the upshift sensor 17 is activated (step b). Shift up sensor 17
is ON and the transmission 10 is about to be shifted to the high speed side, the ignition timing is retarded to reduce the output of the engine 1 (step C). In this case, at the same time as the shift-up sensor 17 is turned ON, control is performed to retard the ignition timing by a predetermined amount of time or a predetermined number of rotations to reduce the output of the engine 1 (Step C). After that, shift up sensor 17 is O.
When it becomes FF, it moves to step a (step d).

In this way, at the same time as the shift-up sensor 17 is activated,
The ignition timing of the engine 1 is retarded to reduce the output of the engine 1, and the shift operation of the transmission 10 can be performed quickly and smoothly without returning the throttle at all during sudden acceleration.

[Effects of the Invention] As described above, the present invention includes a shift-up detection means for detecting a shift-up of a shift operating means, and a shift-up detection means for retarding the ignition timing of the engine by a predetermined time or a predetermined number of revolutions upon detection of this shift-up. and retard means, so that when the operating means shifts up the transmission, the shift-up detection means detects this shift-up and retards the ignition timing of the engine by a predetermined time or a predetermined number of rotations. , the engine output decreases without releasing the throttle at all during sudden acceleration. Therefore, by detecting the upshift operation of the shift operating means, the ignition timing is retarded by a predetermined amount of time or a predetermined number of revolutions at that moment, thereby reducing the engine output and reducing the load on the transmission. A shift operation during sudden acceleration can be performed quickly and smoothly without changing the change mechanism of the transmission.

In addition, since the retard control controls the ignition timing by a predetermined amount of time or a predetermined number of revolutions, the retard control is performed only for the period necessary for the shift operation, and the ignition timing is otherwise controlled according to the normal basic ignition timing characteristics. Engine performance is not impaired.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a motorcycle engine to which an embodiment of the present invention is applied, FIG. 2 is a diagram showing the relationship between engine speed and ignition timing, and FIG. 3 is a diagram of an ignition system for an engine according to the present invention. It is an operation flowchart. In the figure, reference numeral 1 is an engine, 9 is an ignition timing control means, 10 is a transmission, 11 is a shift pedal, 15 is an engine rotation speed detection sensor, 16 is an ignition coil, and 17 is a shift up sensor.

Claims (1)

[Claims] In an engine equipped with a shift operation means for upshifting or downshifting a transmission, a shift-up detection means detects an upshift of the shift operation means, and a shift-up detection means detects an upshift of the shift operation means, and the ignition timing of the engine is adjusted for a predetermined time or a predetermined rotation by detecting the shift up. 1. An ignition device for an engine, comprising: ignition timing control means for retarding ignition timing by several minutes.