JP2937209B2 - Ignition timing control device for outboard motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition timing control device for an outboard motor, and more particularly to an ignition device for an outboard motor of a type in which electric charges charged in a charging capacitor are applied to an ignition coil at a predetermined timing.

[0002]

2. Description of the Related Art Generally, in an outboard motor, an ignition timing is retarded in a low rotation speed range (at a low speed) and a combustion pressure is reduced, so that uncomfortable vibration is not given to a passenger. This is important when fishing at low speed for a long time, when traveling in the low speed limit pressure area of the bay or lake shore, or when used in leisure applications where riding comfort is important. But,
In commercial applications such as fisheries and in applications where speed is important, emphasis is placed on increasing output and fuel efficiency (efficiency) by advancing the ignition timing at the same throttle opening even if it is uncomfortable to some extent. In this case, if the angle is advanced from the above-mentioned retarded state at the same throttle opening, the combustion speed and the combustion pressure are increased, so that the output is improved and the combustion efficiency is also increased.

[0003]

However, in the above conventional example, the combustion speed and the pressure increase,
Since the combustion pressure rises and the fluctuation from cycle to cycle increases, the vibration increases. On the other hand, in the above prior art, the ignition timing is adjusted to various uses of the user,
Since the ignition timing is set at an intermediate level between the various applications, there is a disadvantage that the individual applications cannot be sufficiently coped with. Providing ignition timing specifications according to individual applications is disadvantageous in terms of cost due to the production of small quantities and many types, and also emphasizes ride comfort when the user is the same outboard motor and sometimes emphasizes output. Or it was impossible to use them properly according to the situation, such as emphasizing speed.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to improve the disadvantages of the prior art and to provide an outboard motor for an outboard motor which allows an operator to arbitrarily select and set the ignition timing according to the situation and speed of the ship. An object is to provide an ignition timing control device.

[0005]

According to the present invention, a signal distribution circuit for sequentially turning on / off a plurality of discharge driving elements such as thyristors using an output signal from a pulsar coil, A charging capacitor for applying a predetermined discharge current to each of the plurality of ignition coils, and an output of a gear count coil provided separately with an output timing of an on / off control signal for the discharge drive element output from the signal distribution circuit. A gear pulse count circuit that is determined based on the number of pulses, a count number control circuit that regulates the number of pulses counted by the gear pulse count circuit to a predetermined value based on throttle opening information from a previously equipped throttle sensor. It has. The count number control circuit is provided with ignition timing selection means for increasing or decreasing the number of pulses for the gear pulse count circuit output from the count number control circuit as necessary. I have. This aims to achieve the above-mentioned object.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of this embodiment. The embodiment shown in FIG. 1 includes a signal distribution circuit 33 that sequentially turns on and off a plurality of discharge driving elements such as thyristors using output signals from pulsar coils 12 ₁ and 12 ₂ ,
A charge capacitor 24 for applying a predetermined discharge current to each of the plurality of ignition coils 10 ₁ and 10 ₂ via a discharge drive element.
A gear pulse counting circuit 32 that determines the output timing of the on / off control signal for the discharge drive element output from the signal distribution circuit 33 based on the number of output pulses of the gear counting coil 14 separately provided in advance; A count control circuit 34 is provided which regulates the number of pulses counted by the pulse count circuit 32 to a predetermined value based on throttle opening information from the throttle opening sensor 16 provided in advance. Further, the count number control circuit 34 includes an ignition timing changeover switch as ignition timing selection means for increasing or decreasing as necessary the number of pulses for the gear pulse count circuit output from the count number control circuit 34. 1 is equipped.

The discharge drive element is, specifically, an ignition coil 1
0 _1, 10 ₂ into corresponding two thyristors (SCR # 1,
# 2) 21 ₁ and 21 ₂ are used. Reference numeral 35 indicates a power supply circuit. The outputs of the pulsar coils 12 ₁ and 12 ₂ are sent to the gear pulse counting circuit 32 and the signal distribution circuit 33 after being shaped by the waveform shaping circuit 31. Reference numerals 24 ₁ and 24 ₂ indicate spark plugs.

Next, the operation of the above embodiment will be described. The basic operation of the embodiment shown in FIG. 1 will be described. In FIG. 1, first, the gear pulse counting circuit 32 includes a pulser coil 12 mounted at a specified angle.
_1, 12 a signal from the ₂ based on the count start signal,
For example, when the counting of the pulses of the gear coil 14 detected at intervals of 1 ° starts and reaches a predetermined count, SCR # 1 or SCR # 2 is turned on.
The energy previously stored in the charging capacitor 24 is released, and a high voltage is generated in the ignition coils 10 ₁ and 10 ₂ to ignite.

The above count is controlled by a signal from the throttle opening sensor 16. The throttle sensor 16 is attached to a carburetor or the like, detects the angle of a throttle shaft (see FIG. 6), and outputs a voltage corresponding to the throttle opening as shown in FIG. Then, the count number according to this voltage is determined by the count number control circuit 34 inside the ignition timing control unit 9, whereby the ignition timing according to the throttle opening is obtained. As shown in FIG. 3, the actual ignition timing characteristics include a voltage (for example, a
The ignition timing is, in principle, constant below or below (point b) and above a certain voltage in the high opening range (for example, point b: for preventing knocking or the like).

In this embodiment, an ignition timing changeover switch 1 as ignition timing selection means is added to the basic system as described above. The changeover switch 1 changes the output of the throttle opening sensor 16 within a range where there is no problem in combustion, and obtains an ignition timing according to the situation. This ignition timing switch 1 is shown in FIG.
As shown in FIGS. 4A and 4B, the extension cord 42 is composed of a combination of resistors or a variable resistor, and is provided outside the outboard motor control unit 40, as shown in FIGS. Outside of the remote control box 43, a lever portion (not shown), or a driver's seat instrument panel 44
And so on. By applying the voltage of the ignition timing switch 1 to the output of the basic throttle sensor 1, the ignition timing characteristics as shown in FIG. 7 can be obtained.

As described above, in the above-described embodiment, the ignition timing changeover switch 1 is provided at a place where the operator can easily operate, so that the ignition timing can be easily selected at hand according to the purpose of use by the user. In particular, when the hull used by the user has a low rigidity and vibration is easily transmitted, for example, when the hull used by the user is used for a long time in a low rotation range, the vibration is suppressed by setting the mild side in FIG. 6 and retarding the ignition timing. When the response is low and the engine speed is low and the economy is mainly used in the low and medium engine speed regions and the economy is mainly used, the ignition timing is advanced so that the maximum output at the throttle opening can be obtained. On the other hand, in the case of an outboard motor that is of the underwater exhaust type during reverse (reverse), exhaust is difficult to escape and combustion deteriorates, and a large load is applied when the hull shape reverses, the engine speed decreases, and in some cases the engine stops. I do. In this case, the problem can be prevented by advancing the angle by the changeover switch 1.

The outboard motor is a special finished product which is different from an automobile or a motorcycle and is only one product with only an engine and a drive system (such as a propeller). The hull (body) is sold separately and has various shapes and shapes depending on the use of the user. Size, weight and rigidity are selected. For this reason, it is impossible to set the ignition timing according to the hull (load) at the time of design and production, and setting specifications that are suitable for various hulls results in small-quantity, multi-product production, and manufacturing and cost reduction. Although disadvantageous above, this can be all solved in the embodiment.

Further, this embodiment has an advantage that the initial adjustment error of the throttle opening sensor 16 can be easily absorbed. FIG. 9 shows an example of the throttle opening sensor 16. The throttle opening sensor 16 generally detects the rotation of the carburetor by changing the rotation of the throttle shaft 51 into the rotation of a variable resistor through gears, levers, links, and the like (in addition, magnetic force, light, and the like are used). Some are).

The adjustment of the initial output of the throttle opening sensor 16 (output at the time of full closing) is performed by finely adjusting the sensor body by rotating the sensor main body around the rotation axis of the throttle shaft 51 as shown by reference numeral a in FIG. In general, this work is difficult and time-consuming to adjust without displacing by 1 mm as the size of the sensor body is reduced, and the rubber cushion is used because the sensor body has vibration resistance. It has become more difficult when mounting is done in such as. On the other hand, according to the embodiment, even if there is an adjustment error of the detection angle as shown in FIG. 10 in the initial adjustment of the throttle opening sensor, the ignition timing characteristic is switched by the switch as shown in FIG. There is an advantage that the characteristic can be moved in the direction of E or F to absorb the error.

[0015]

Since the present invention is constructed and functions as described above, according to this, the ignition timing is set by the ignition timing selection means by the ignition timing selection means and the operation of the count number control circuit accompanying the selection. An excellent outboard motor ignition timing control which can be arbitrarily changed, whereby an ignition timing which directly affects the running state of the hull can always be selected and set to an optimum state according to the intention of the operator. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing output characteristics of a throttle opening sensor in FIG. 1;

FIG. 3 is a diagram showing a relationship between a throttle opening of a throttle opening sensor and an ignition timing in FIG. 1;

FIGS. 4 and 5 are explanatory views showing examples of equipment positions of an ignition timing changeover switch in FIG.

FIG. 6 is an explanatory diagram showing a display example of switching of an ignition timing switch in FIG. 1;

7 and 8 are explanatory diagrams showing an example of a function of an ignition timing changeover switch in FIG.

FIG. 9 is a plan view showing an example of a gear mechanism of a carburetor portion provided with a throttle opening sensor in FIG. 1;

FIG. 10 is an explanatory diagram showing an example of an error that easily occurs in the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS ₁ Ignition timing changeover switch as ignition timing selection means 10 ₁ , 10 ₂ Ignition coil 12 ₁ , 12 ₂ Pulser coil 14 Gear count coil 16 Throttle opening sensor 21 ₁ , 21 ₂ Thyristor as discharge drive element 24 Charge capacitor 32 Gear pulse Count circuit 33 Signal distribution circuit 34 Count number control circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-8268 (JP, A) JP-A-1-315670 (JP, A) JP-A-60-138273 (JP, A) JP-A 61-1986 135985 (JP, A) JP-A-63-176668 (JP, A) JP-A-58-1333477 (JP, A) JP-A-59-128976 (JP, A) JP-A-59-128977 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 5/155

Claims (1)

(57) [Claims] A plurality of discharge driving elements, such as thyristors, are sequentially turned on by using an output signal from a pulsar coil.
A signal distribution circuit for off-control, a charging capacitor for applying a predetermined discharge current to each of a plurality of ignition coils via the discharge drive element, and an on / off control for the discharge drive element output from the signal distribution circuit A gear pulse counting circuit that determines the output timing of the signal based on the number of output pulses of a separately provided gear count coil, and a throttle opening from a previously equipped throttle sensor that determines the number of pulses counted by the gear pulse counting circuit. And a count number control circuit that regulates the count value to a predetermined value based on the information.The count number control circuit increases the number of pulses for the gear pulse count circuit output from the count number control circuit as necessary. Alternatively, an ignition timing control device for an outboard motor is provided with ignition timing selection means for decreasing the ignition timing.