JP2890643B2 - Outboard motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor, and more particularly to an outboard motor for efficiently performing forward rotation and reverse rotation.

[Conventional technology]

The ignition timing of the outboard motor advances in relation to the throttle opening of the carburetor. For this reason, when the throttle opening is the same at the time of forward and reverse, the ignition timing is completely the same.

[Problems to be solved by the invention]

When operating the hull using an outboard motor, the reverse throttle opening is wider between the forward and reverse due to the difference in the load on the ship and the escape of exhaust, even at the same rotational speed. Would. Therefore, during reverse, the pressure applied to the gasoline outlet of the carburetor decreases, and the amount of intake air also increases. In addition, at the time of reverse, the exhaust gas goes back to the outside water flow, so that the exhaust gas is not well extracted and the output is reduced.

That is, in this case, the carburetor setting in the reverse is thinner than that in the forward. For this reason, in the conventional example described above, it is difficult to simultaneously satisfy the forward time and the reverse time at the same time during the carburetor setting. Failure).

[Object of the invention]

SUMMARY OF THE INVENTION The present invention is directed to an outboard motor engine ignition timing control device which can solve the disadvantages of the conventional example and can increase the output similarly to the forward operation even when the outboard motor operates in reverse. Its purpose is to provide.

[Means for solving the problem]

According to the present invention, there is provided an engine and an outboard motor body provided with a mode switching mechanism for switching the engine between a forward mode and a reverse mode, and operating the mode switching mechanism on the outboard motor body to operate the engine in a forward mode or a reverse mode. And an engine ignition timing control unit that controls switching to a mode.

This engine ignition timing control unit is equipped with a gear pulse count circuit that sets advance position information according to the throttle opening degree when outputting an ignition timing setting signal to the engine. Further, a clutch sensor for sending a reverse signal to the gear pulse counting circuit when the engine is set to the reverse mode is provided in the mode switching mechanism described above.

When the reverse signal is input, the gear pulse count circuit is equipped with a reverse ignition advance angle setting circuit section that immediately operates to set the engine ignition timing to an advanced state more than in the forward mode. It has a configuration. This aims to achieve the above-mentioned object.

[Action]

When the operator switches the mode switching mechanism to the reverse (reverse) direction, the rotational force is transmitted to the clutch sensor. In this case, the clutch sensor immediately outputs a reverse signal and sends it to the gear pulse counting circuit. When a reverse signal is input from this reverse sensor, the reverse ignition advance angle setting circuit is immediately activated in the pulse count circuit, and the ignition timing specification curve is forcibly switched to the advanced state. For this reason, even if the opening of the throttle valve does not change, during reverse, the ignition timing shifts to an advanced state and the outboard motor output increases.

(Example of the invention)

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

The embodiment shown in FIG. 1 to FIG.
An outboard motor main body 60 provided with a mode switching mechanism 51 for switching between the forward mode and the reverse mode, and switching the engine 50 to the forward mode or the reverse mode with the operation of the mode switching mechanism 51 provided in the outboard motor main body 60 And an engine ignition timing control unit 1 to be controlled. The engine ignition timing control unit 1 is provided with a gear pulse count circuit 14 for setting advance position information in accordance with the throttle opening degree when outputting the ignition timing setting signal S to the engine 50.

The mode switching mechanism 51 is provided with the clutch sensor 7 for sending a reverse signal to the gear pulse counting circuit 14 when the engine is set to the reverse mode. Then, when the reverse signal is input, the engine is started immediately to set the engine ignition timing to an advanced state more constantly than in the forward mode.
Are provided in the gear pulse counting circuit 14 described above.

More specifically, FIG. 1 is a block diagram showing an example of an ignition control device for an outboard engine.

In FIG. 1, an engine ignition timing control unit (hereinafter simply referred to as a “control unit”) 1 includes a capacitor charging coil unit provided at a predetermined location of the outboard motor main body 60.
2, a pulsar coil section 3, a gear count coil section 4, a throttle sensor 5, a timing switching means 6, and the aforementioned clutch sensor 7 are connected. Reference numeral 8 denotes an ignition coil unit having a plurality of independent ignition coils.

The capacitor charging coil unit 2 has a function of operating with the rotation of the engine and constantly charging the charging capacitor circuit 2 in the control unit 1.

The pulsar coil unit 3 has the same number of pulsar coils as the number of ignition coils in the ignition coil unit 8 and outputs a pulse signal at a predetermined timing in synchronization with the rotation of the engine 50. It has a function of driving the control circuit 12.

The control unit 1 further includes a charging capacitor circuit 11 for storing a current for each coil of the ignition coil unit 8, and an ignition drive control circuit for controlling the current charged in the charging capacitor circuit 11 to energize the ignition coil unit 8. It has 12 and.
The ignition drive control circuit 12 includes a plurality of thyristors corresponding to the respective ignition coils of the ignition coil unit 8 described above.

The control unit 1 further includes a signal distribution circuit 13, a gear pulse count circuit 14, and a gear pulse count control circuit 15.
It has.

The signal distribution circuit 13 determines whether the predetermined pulse signal sent from the pulsar coil unit 3 corresponds to any one of the above-mentioned ignition coils, and sets a control code for turning on the thyristor for the corresponding ignition coil. ,
It is sent to the ignition drive control circuit 13 described above.

The gear pulse count circuit 14 sets the timing of the ignition timing and controls the output of the signal distribution circuit 13 described above. The gear pulse count circuit 14 receives the output of the pulsar coil unit 3 and the output of the gear count coil unit 4 and inputs the pulsar coil. Based on the output signal (count number) of the gear count coil unit 4 with reference to the output signal from the unit 3, the thyristor conduction signal is advanced or delayed and output.

The gear pulse count number control circuit 15 receives a signal from the throttle sensor 5 and outputs a predetermined signal according to the degree of opening thereof.
A certain limit is imposed on the counting operation of the thyristor, whereby the output time of the thyristor control timing signal can be controlled.

The gear pulse count control circuit 15 is further supplied with a switching signal from the timing switching means 6 for changing the output, particularly during trolling, according to the situation. By inputting this signal, for example, the ignition timing at the time of trolling is changed to θ ₅ shown in FIG.
The change in position of the theta ₃ from the position, thereby so that the overall outboard motor output is set to be advanced state an engine rotational speed is constant is increased.

The gear pulse count circuit 14 is further provided with a reverse ignition advance angle setting circuit section 14A. The reverse ignition advance angle setting circuit section 14A of the gear pulse count circuit 14 is operated by the reverse signal sent from the clutch sensor 7 described above.

This reverse signal is specifically output by the switching operation of the mode switching mechanism 51 shown in FIG. 2 and FIG.

More specifically, as shown in FIG. 2, an outboard motor main body 60 has an FR switching lever for switching between forward movement and reverse movement.
51A is equipped. Reference numeral 52 indicates a switching shaft.
The switching shaft 52 is provided with a clutch plate 53. The clutch plate 53 can reciprocate in the direction of arrow A together with the switching shaft 52 as shown in FIG. When the mode switching lever 51A is switched in the reverse direction, the clutch sensor 7 described above is disposed ahead of the clutch plate 53 in the rotation direction. The clutch sensor 7 is provided in the outboard motor main body 60 via the bracket 53.

 Here, the reverse operation will be described.

When the operator switches the clutch lever 51 in the reverse (reverse) direction, the rotational force is immediately transmitted to the clutch sensor 7 via the switching shaft 52 and the clutch plate 53. Then, the clutch sensor 7 immediately outputs a reverse signal and sends it to the gear pulse counting circuit 13 described above.

When a reverse signal is input from the reverse sensor 7, the ignition timing advance setting circuit section is immediately activated in the pulse count circuit 13, and the ignition timing specifying curve is changed to the value A shown in FIG.
The characteristic is forcibly switched to the B characteristic. Therefore, the throttle Bal opening In the reverse time without changing the ignition timing of the flop is the point from point P ₁ in the diagram of FIG. 4 P ₂
Move on to Therefore, the output of the outboard motor is effectively increased.

〔The invention's effect〕

As described above, according to the present invention, at the time of reverse, the reverse sensor and the reverse ignition advanced angle setting circuit operate to immediately set the ignition timing to the advanced state, and therefore, the throttle opening is unchanged. Thus, it is possible to provide an unprecedented excellent outboard motor that can surely increase the engine output.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an engine ignition timing control unit of an outboard motor according to an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing a part of the outboard motor main body of the outboard motor equipped with the block diagram of FIG. 3, FIG. 3 is an operation explanatory diagram showing a reverse sensor part incorporated in the outboard motor main body of FIG. FIG. 4 is a diagram showing the change in the advance angle characteristic, and FIG. 5 is an explanatory diagram showing the relationship between the engine speed and the advance angle. 1 ... Engine ignition timing control unit, 7 ... Reverse sensor, 14 ... Gear pulse count circuit, 14A ... Reverse ignition advance angle setting circuit section, 50 ... Engine, 51 ... Mode switching mechanism, 60 ... Outboard motor body.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 5/145-5/155 F02D 27/00-27/02 F02D 29/00-29/06 F02D 43 / 00-45/00

Claims (1)

(57) [Claims] An outboard motor main body having an engine and a mode switching mechanism for switching between a forward mode and a reverse mode of the engine, and the engine is forwardly moved with the operation of the mode switching mechanism provided in the outboard motor main body. And an engine ignition timing control unit that controls switching to a reverse mode or a reverse mode. The engine ignition timing control unit sets advance angle position information according to the magnitude of a throttle opening when outputting an ignition timing setting signal to the engine. An outboard motor equipped with a gear pulse count circuit, wherein the mode switching mechanism includes a clutch sensor that sends a reverse signal to the gear pulse count circuit when the engine is set to a reverse mode. When a signal is input, it is activated immediately to advance the engine ignition timing Reverse ignition timing advance angle setting circuit for setting always advanced state than during over de outboard motor, characterized in that equipped with the gear pulse counting circuit.