JPS62258169A - Starting device for internal combustion engine - Google Patents

Abstract

PURPOSE:To carry out the starting of an engine stably and securely by controlling the driving of a starter motor until the crankshaft of said engine becomes in a condition to be able to go over the top dead center, after a starter switch is judged to be on. CONSTITUTION:When a starter switch 2 is turned on, a starter motor 1 is operated via a magnet switch 3 to start an engine. A switch input judging circuit 5 in a driving control means 4 judges that said switch 2 is turned on, to operate a monostable circuit 7 via a trigger circuit 6. And, the magnet switch 3 is kept on for a set period of time by means of a driving circuit 8 to continue the operation of the starter motor 1. Also, a signal from the ignition detecting means 9 of an ignition plug 9a is inputted into the monostable circuit 7 via a wave form shaping circuit 10 and a delay circuit 11 and, when the defined operating condition of the engine is reached, the monostable circuit 7 is reset positively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting device for an internal combustion engine mounted on a motorcycle, an automobile, or the like.

[Problems to be Solved by the Prior Art and the Invention] Generally, this type of internal combustion engine is started by turning a magnet switch ON/L using a starter switch to drive the starter motor. However, with this product, the starter switch is only turned on for a very short time.
In case it is not N.

An arc occurs between the contacts of the magnetic switch.

This is not a scam that may damage the contacts, and the conduction time of the magnetic switch is extremely short, so the crankshaft does not reach the top dead center of the internal combustion engine, making it impossible to start the engine reliably. . Furthermore, if this operation is repeated many times, there is a risk that the starting system gears will be damaged due to Wr strike during starting or reverse movement during the pressure stroke, which has become a problem.

[Means for Solving the Problems] The present invention has been devised in view of the above-mentioned circumstances with the aim of providing a starting device for an internal combustion engine that can eliminate these drawbacks. The starter switch circuit that drives the starter motor to start the internal combustion engine determines that the starter switch is turned on, and the crankshaft is able to move to top dead center even if the starter switch is intoxicated. The invention is characterized in that a drive control means is provided for driving the starter motor up to.

According to the present invention, even if the starter switch is turned off immediately after being turned ON, the starter motor is driven for a predetermined period of time, thereby maintaining the ON state of the magnetic switch and reliably preventing malfunctions. It has been made possible.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a starter motor for an internal combustion engine, 2 is a starter switch, and 3 is a magnet switch.
When the switch is turned on, a current flows through the magnet part 3a and the switch contact 3b is closed, which drives the starter motor 1 and starts the internal combustion engine. Same as before.

4 is a drive control means provided in the circuit of the starter switch 2, and the drive control means 4 includes a switch input determination circuit 5.4 that determines whether the starter switch 2 is turned on. Furthermore, it is constructed using a trigger circuit 6, a monostable circuit 7 having a certain time constant, and a drive circuit 8 following this. Then, when the starter switch 2 is turned on, the switch input discrimination circuit 5 discriminates this, and the monostable circuit 7 is activated by the trigger circuit 6. This operating state is maintained only for a certain period of time determined by the time constant of the monostable circuit 7, and during this period, the magnetic switch 3 is maintained in the ON state by a command from the i-drive circuit 8. .

The starter motor 1 will continue to drive, but this time constant will change after the starter switch 2 is turned on.

The time is set to be sufficient for the crankshaft to be able to cross top dead center, and as a result, the starter motor 1
is configured so that even if the starter switch 2 is turned off immediately after being turned on, it continues to drive until the crankshaft is in a state where it can cross top dead center.

Reference numeral 9 denotes an ignition detection means for detecting ignition of the ignition plug 9a when the starter switch 2 is turned on, and the ignition detection signal from the ignition detection means 9 is transmitted to the waveform shaping circuit I
The monostable circuit 7 is reset by inputting the input to the monostable circuit 7 through the O1 delay circuit 11, but in this case, the delay circuit 11 is used to control the timing when the crankshaft is in a state where it can cross top dead center after the plug ignites. This functions to delay the input of the ignition detection signal to the monostable circuit 7 until the ignition detection signal reaches the monostable circuit 7.

In the embodiment configured as described above, the internal combustion engine is started by turning on the starter switch 2. However, in the present invention, if the starter switch 2 is only turned on for a very short time, the engine is started. The magnet switch 3 is maintained in the ON state by a command from the control means 4,
The starter motor 1 continues to be driven until the crankshaft is able to move beyond the top dead center.

That is, in the present invention, when the starter switch 2 is turned on, the switch input circuit 5 operates in the drive control means 4, and the trigger circuit 6 is activated to put the monostable circuit 7 into an operating state. Therefore, even if the starter switch 2 is turned ON for a very short period of time, the magnet switch 3 of the starter motor 1 will remain ON in response to the command from the drive control means 4, and the crankshaft will always be able to move beyond the top dead center. The starter motor 1 will continue to drive until the condition is reached, thus preventing problems such as arcing between the contacts of the magnetic switch 3 or the starter motor 1 stopping without starting the internal combustion engine, as in the past. can be prevented,
After the starter switch 2 is turned on, the starter motor 1 must continue to drive until the crankshaft passes the top dead center, thereby reliably avoiding damage to the starting system gears due to impact during starting or reversing. become.

Furthermore, in the embodiment, when the crankshaft reaches a state where it can cross top dead center, the monostable circuit 7 is actively reset by ignition detection, so that, for example, if the monostable circuit 7 is damaged, the time constant Complementary when the starter motor 1 does not stop driving even after the time determined by
When the internal combustion engine starts with a normal starting operation, the starter motor 1 can be stopped almost at the same time when the starter switch 2 is set to snoring, and even after the starter switch 2 is turned off using the monostable circuit 7. Even if the starter motor 1 is configured to continue to be driven for a predetermined period of time, this is convenient because it does not cause any trouble.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the point is that the starter switch circuit determines that the starter switch has been turned on, and even if the starter switch is turned on, the crank cannot be turned off. Any drive control means may be provided as long as it is provided with a drive control means for driving the starter motor until the shaft reaches a state in which it can pass the top dead center.

If the crankshaft is automatically reset by its own time constant as in the embodiment after the crankshaft is able to cross top dead center, a means to actively reset it is not necessarily required. It is. The drive control means can also be reset by top dead center detection, which detects that the crankshaft has reached the top dead center.

[Operations and Effects] In summary, since the present invention is configured as described above, even if the starter switch is only turned on for a very short time, the drive control means that has determined that the starter switch is turned on will not turn on the magnetic switch. Maintain the ON state,
A drive command is issued to the starter motor to continue driving until the crankshaft can cross top dead center. Therefore, there is no possibility of arcing, and the internal combustion engine This allows for a smooth start.

Furthermore, since the starter switch is controlled to continue driving for a predetermined time even if the starter switch is turned off for a short period of time, it is possible to prevent damage to the starting system gears due to impact during automatic operation or reverse rotation.

[Brief explanation of drawings]

The drawings show an embodiment of the starting device for an internal combustion engine according to the present invention, with FIG. 1 being a starter circuit diagram and FIG. 2 being a timing chart. In the figure, 1 is the starter motor, 2 is the starter switch, and 3
4 is a magnetic switch, and 4 is a drive control means.

Claims (1)

[Claims] The starter switch circuit that drives the starter motor to start the internal combustion engine determines that the starter switch is turned on, and the crankshaft remains in a state where it can cross top dead center even if the starter switch is turned off. A starting device for an internal combustion engine, comprising a drive control means for driving a starter motor.