JPS63227961A - Ignition device for marine propulsion engine - Google Patents

Abstract

PURPOSE:To surely alarm abnormality despite a change or the like of a load, by actuating an alarm circuit by each detection signal from an abnormality detecting circuit or a battery detecting circuit and holding a condition of this action by a holding circuit before a release signal is input. CONSTITUTION:AC power of a charging coil 1, which is rectified by a diode 4 in an ignition circuit 3 in a control unit 2 and discharged by conducting a thyristor 6 after a capacitor 5 is charged, generates high voltage in the secondary side of an ignition coil 7 sparking an ignition plug 8. Here a driving power source from plural batteries 27, 28 is given to an abnormality detecting circuit 19 through a selector switch 26. And a device, which detects the battery, when, for instance, it is disconnected, by a battery detecting circuit 34, alarms the condition of abnormality through an alarm output circuit 35 while actuates a holding circuit 18. In this way, a signal from a pulser coil 10 is thinned by actuating a misfiring circuit 12 through an engine speed control circuit 16 constituting an alarm circuit 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an ignition device for a marine propulsion device, and more particularly to an ignition device for a marine propulsion device equipped with an alarm circuit that warns of an abnormality in an internal combustion engine.

(Prior art) In the ignition system of an internal combustion engine installed in a marine propulsion device,
For example, there are systems in which an abnormality that occurs in an internal combustion engine, such as overheating or a drop in oil level, is detected by an abnormality detection circuit, and based on this detection signal, an alarm circuit lowers the rotational speed of the internal combustion engine to issue an alarm.

By the way, ships are equipped with a pair of batteries, and one battery is charged when the internal combustion engine is operated, and the other battery is charged when the navigation equipment or internal combustion engine malfunctions. There is a device that uses it as a drive power source for an abnormality detection circuit that detects the above, and switches between the two at an appropriate time.

(Problems to be solved by the invention) In devices where batteries are frequently changed like this,
There may be cases where the battery is disconnected during switching, due to a mistake in switching, or when the battery is disconnected during the switching, and the battery load fluctuations and noise that occur at this time may affect the operation of the alarm circuit.

This invention was made to eliminate these drawbacks, and its purpose is to provide a marine propulsion system that avoids battery load fluctuations and noise from affecting the alarm circuit that warns of abnormalities in the internal combustion engine. ignition device.

(Means for Solving the Problem) In order to achieve this object, the present invention controls the output of a charging coil driven by the operation of an internal combustion engine based on a pulse signal output from a pulser coil in synchronization with the rotation of the internal combustion engine. In an ignition system for a marine propulsion device, which includes an ignition circuit that generates a high voltage in an ignition coil, an abnormality detection circuit that uses a battery as a driving power source and detects an abnormality in an internal combustion engine, and an alarm circuit that issues an alarm based on this detection signal. , comprising a holding circuit that activates the alarm circuit in response to a detection signal from the abnormality detection circuit or a detection signal from a battery detection circuit that detects disconnection of the battery, and maintains this activated state until a release signal is input. It is characterized by

(Function) In the present invention, when an abnormality detection signal or a battery disconnection detection signal is input to the holding circuit, the alarm circuit is activated. Since this operating state is maintained until a release signal is input, even if the load fluctuates or noise occurs due to a battery switching operation or the like, this holding circuit prevents the alarm circuit from being affected.

(Example) The present invention will be described below based on an example shown in the drawings.

In the figure, reference numeral 1 denotes a charging coil, which generates electricity and outputs AC power when an internal combustion engine of a boat propulsion device (not shown) is operated. This AC power is rectified by the diode 4 of the ignition circuit 3 provided in the control unit 2 and charged to the capacitor 5, and this charged charge is discharged by the conduction of the thyristor 6.
A high voltage is generated on the secondary side of the ignition coil 7 to cause the ignition plug 8 to spark.

The gate of the thyristor 6 is grounded via a capacitor 9, and the pulsar coil 1 is connected between the capacitor 9 and the gate.
0 is connected.

An engine stop circuit 11 and a misfire circuit 12 are connected to the pulsar coil 10, and the emitter of a transistor 13 of the engine stop circuit 11 is connected to the pulsar coil 10.
A collector is grounded, and a kill switch 15 is connected to the base via a resistor 14. When the base current flows through the transistor 13 by operating the kill switch 15, the transistor 13 becomes conductive, the output side of the pulser coil 10 is grounded, and the output of the pulser coil 10 disappears.

For this reason, even if the distance between the kill switch 15 and the engine stop circuit 11 becomes longer and the signal line becomes longer, especially in ships that are operated remotely, when the engine stop circuit 11 is activated, the pulse signal will not pass through the control unit z. Since the pulse signal returns immediately to the pulser coil 10, the length of the line through which the pulse signal flows is shortened, making it difficult for noise to enter. Therefore, the internal combustion engine can be stopped quickly without causing the ignition circuit 3 to malfunction.

Furthermore, since the control signal controlled by the kill switch 15 only needs to operate the transistor 13, the operating voltage of the transistor 13 can be increased, making the circuit resistant to noise.

The misfire circuit 12 is controlled by a rotation speed control circuit 16,
The misfire circuit 12 and the rotational speed control circuit 16 constitute an alarm circuit 17. A holding circuit 18 is connected to the rotational speed control circuit 16, and an abnormality detection circuit 19 is further connected to this holding circuit 18. When the detection signal from the abnormality detection circuit 19 is input to the holding circuit 18, the misfire circuit 12 is activated via the rotational speed control circuit 16. The holding of the holding circuit 18 is released by detecting the rotational speed of a neutral switch 20 or a throttle (not shown) when the throttle is fully closed.

The abnormality detection circuit 19 includes an overheat detection circuit 21, an oil level detection circuit 22, and a dual alarm detection circuit 23.
These are connected to batteries 27 and 28 selected by a changeover switch 26 through a parallel circuit of a buzzer 24 and a lamp 25, respectively, and a driving voltage is applied thereto.

When the temperature of the cooling water of the internal combustion engine reaches a predetermined temperature abnormality, the overheat detection circuit 21 closes the contact 29 and outputs a detection signal. When the oil level detection circuit 22 reaches a predetermined position, the contact 30 closes and the thyristor 3
1 becomes conductive and outputs a detection signal. In addition, when two propulsion machines are installed, and an abnormality occurs in the other internal combustion engine, the alarm detection circuit 23 controls the operation of the normally operating internal combustion engine (for example, stops the propulsion machine). )
It controls abnormalities in the system. For example, when the contact 32 closes due to an abnormal signal from the internal combustion engine of the other propulsion device, the transistor 33 becomes conductive and outputs a detection signal to stop the normally operating internal combustion engine.

The holding circuit 18 is activated by the output of the detection signal from the abnormality detection circuit 19, and the buzzer 24 and lamp 2 are activated.
Alarm will be issued at 5.

Also, a battery 2 serves as a driving power source for the abnormality detection circuit 19.
7.28 is connected to the battery detection circuit 34 via the changeover switch 26, and detects the voltage drop due to the battery being disconnected.If the battery is disconnected, it is assumed that there is an abnormality in the internal combustion engine and the holding circuit 18 is activated. , activates the alarm output circuit 35 to issue an alarm.

Therefore, the abnormality detection circuit 19 of the internal combustion engine is supplied with driving power from the battery 27 or the battery 28 selected by the changeover switch 26, and the battery 27 or 28 that is the driving power source of this abnormality detection circuit 19 is connected to the changeover switch 26. For example, if the battery is disconnected, the battery detection circuit 34 detects this, issues an alarm via the alarm output circuit 35, and activates the holding circuit 18.

When the misfire circuit 12 is activated via the rotational speed control circuit 16 by the operation of the holding circuit 18, for example, the pulsar coil 1
A balsa signal of 0 is spread. As a result, the time interval between conduction of the thyristor 6 becomes longer, the spark of the ignition plug is scattered, the rotational speed of the internal combustion engine decreases, and a warning of abnormality of the internal combustion engine is issued.

The holding circuit 18 that issues an alarm for this abnormality is released by the neutral switch 20 or by detecting a fully closed rotational speed (not shown), and can be released safely without stopping the internal combustion engine. It will not be canceled due to fluctuations, noise, etc.

When the batteries 27 and 28 are connected normally, when any one of the abnormality detection circuits 19 is activated, the buzzer 24 and the lamp 25 are activated, and the holding circuit 18 is activated. Therefore, similarly to the above, the misfire circuit 12 is activated via the rotational speed control circuit 16 to reduce the rotational speed of the internal combustion engine and issue a warning.

As described above, this holding circuit 18 is released by detecting the rotation speed when the neutral 20 or the throttle is fully closed, and is not released even by load fluctuations or noise of the batteries 27, 28.

(Effects of the Invention) As explained above, according to the present invention, the alarm circuit is activated by the detection signal from the abnormality detection circuit or the detection signal from the battery detection circuit that detects disconnection of the battery, and the activation state is detected. Since it is equipped with a holding circuit that holds the signal until a release signal is input, even if the load fluctuates or noise occurs due to battery switching operations, this holding circuit prevents the alarm circuit from being affected, and the internal combustion engine An abnormality warning will be issued reliably.

[Brief explanation of drawings]

The figure is a circuit diagram of an ignition device for a marine vessel propulsion device to which the present invention is applied. In the figure, 1 is a charging coil, 2 is a control unit, 3 is an ignition circuit, 10 is a pulsar coil, 11 is an engine stop circuit, 17
is an alarm circuit, 18 is a holding circuit, 19 is an abnormality detection circuit, 2
0 is the neutral switch, 27.28 is the battery.

Claims (1)

[Claims] The output of the charging coil, which is driven by the operation of the internal combustion engine, is controlled based on the pulse signal output from the pulser coil in synchronization with the rotation of the internal combustion engine, and the ignition circuit that generates high voltage in the ignition coil and the battery are used as the driving power source to control the internal combustion. An ignition system for a marine propulsion device that includes an abnormality detection circuit that detects an abnormality in the engine and an alarm circuit that issues an alarm based on this detection signal,
A holding circuit is provided that activates the alarm circuit with a detection signal from the abnormality detection circuit or a detection signal from the battery detection circuit that detects disconnection of the battery, and maintains this activated state until a release signal is input. Ignition system for ship propulsion equipment.