JPH0616981Y2 - Internal combustion engine starter - Google Patents

Description

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

[Problems to be Solved by Prior Art and Invention] In general, there is an internal combustion engine of this kind which can be started by switching a magnet switch by operating a starter switch to drive the starter motor. However, in this case, when the starter motor is driven for an extremely short time of about 0.1 to 0.3 seconds, the internal combustion engine does not start, and the crankshaft of the internal combustion engine exceeds the top dead center. There is a case that it does not reach the above and returns to the opposite.

In such a case, the magnet switch is turned on in an extremely short time.
-OFF switching causes an arc between the contacts of the magnet switch, which may damage the contacts, and the starter motor is driven by the crankshaft in the first compression stroke of the internal combustion engine. If the engine stops before reaching the top dead center, the crankshaft will return in the middle of the first compression stroke, and the reverse impact at this time will adversely affect the starting gear system. Moreover, when this operation is repeated many times, there is a fear that the starting gear system may be damaged, which causes a problem.

If the starter switch that was turned on is turned off before the internal combustion engine is started, the ring gear on the internal combustion engine will rotate in reverse because the crankshaft did not cross the top dead center, or it will move forward because the crossing exceeds the top dead center. In an unstable state of rotating, there is no immediate stop,
In such an unstable state, if the starter switch that has been turned OFF is immediately turned ON again, the pinion gear is operated so as to mesh with the ring gear that is rotating in an unstable manner based on the drive of the starter motor. The gear meshing is not smooth, the starting current of the starter motor becomes large, and if the starter switch is turned off again in this state, an arc will be generated at the switch contact, causing early wear of these parts. There is a fear of inducing damage, which is a problem.

[Means for Solving the Problem] The present invention was devised with the object of providing a starting device for an internal combustion engine that can eliminate these drawbacks in view of the above circumstances, and a starter switch. Is closed, the magnet switch is closed, and the starter motor is driven based on the closed switch to start the internal combustion engine. An AND circuit that outputs a signal by inputting a value signal, a switch input determination circuit that is connected so that an output from the AND circuit is input, and that determines that an output from the circuit is present, and the switch input determination circuit The output from the trigger circuit is connected so that the output from the trigger circuit outputs the trigger signal, and the output from the trigger circuit is input. It is connected in this manner and is started based on the input of a trigger signal, and a signal output is output for a first time constant that is predetermined to correspond to the time until the crankshaft first crosses the top dead center when the internal combustion engine is started. The first monostable circuit and the outputs from the first monostable circuit and the AND circuit, respectively, are connected so that the logic values of the input signals from these circuits are different from each other. An OR circuit that outputs a signal,
And a drive circuit connected so that the output from the OR circuit is input to drive the starter motor by closing the magnet switch based on an ON signal from the circuit,
Further, the first monostable circuit is connected to a reset circuit for outputting based on the first ignition detection accompanying the start of the internal combustion engine to reset the first monostable circuit, and the starter switch which is turned on is connected. An output signal from the OR circuit, which is generated when the operation of the first monostable circuit is stopped, or the first monostable circuit is reset by the output from the reset circuit. It is based on the fact that the drive circuit stops at, and furthermore, the output from the OR circuit is input and connected so as to output a signal to the AND circuit respectively, and the signal from the OR circuit is switched and the starter motor stops. The starter motor is started on the basis of the operation of the starter motor, and the drive of the starter motor is regulated based on the ON operation of the starter switch immediately after the starter motor is stopped. A second monostable circuit that outputs a signal having a logical value different from the ON operation signal of the starter switch to the AND circuit during the second time constant is provided, and the starter switch operated from ON to OFF is again provided. Closing the magnet switch with the ON operation,
It is characterized in that it is configured to regulate until the time corresponding to the second time constant elapses.

With this configuration, the present invention ensures that the starter motor is driven for a predetermined time, and that even if the starter switch is turned on immediately after the starter motor is stopped, it will not be restarted until a predetermined time has elapsed. It is the one.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, M is a starter motor for starting the internal combustion engine (engine), SW is a starter switch, 3 is a magnet switch, and the starter motor M will be described later in connection with turning on the starter switch SW. Current flows through the magnet coil part 3a, and the switch contact 3b
Is started to start the internal combustion engine, and the starter switch circuit is implemented by the circuit configuration shown in FIG. 1 in this embodiment.

That is, this is a starter switch circuit, an output signal from the starter switch SW, a switch input determination circuit 1, a trigger circuit 2, and a circuit passing through a first monostable circuit A,
The output signal from the circuit directly connected from the starter switch SW is input to the OR circuit 4, and the circuit from the OR circuit 4 through the drive circuit 5 to the magnet switch 3 is basically provided. Is composing. When the starter switch SW is turned on, the magnet switch 3 is switched to drive the starter motor M. In this case, the first monostable circuit A works to start the pusher switch SW. Therefore, when the ON operation is performed for a very short time t (the time t is the ON time of the starter switch SW and the crank shaft does not reach the first top dead center),
The first monostable circuit A is activated, and a predetermined time T ₁ corresponding to a first time constant predetermined by the first monostable circuit A (the time, that is, the first time constant T ₁ is , The operation command is output to the drive circuit 5 side only during the time until the crankshaft reaches the first top dead center with the start of the internal combustion engine, and during this time, the drive of the starter motor M is maintained and the crankshaft of the engine is Attention is given to maintaining driving until at least the first top dead center is positively exceeded.

Further, in this device, an AND circuit 6 is connected between the starter switch SW and the switch input determination circuit 1 so that the signal from the starter switch SW is input. The output signal from the circuit 4 side is input to the second monostable circuit B via the inverter 7 to start it, and the time T ₂ corresponding to a predetermined second time constant as described later. The second monostable circuit B that operates only during the time (the time, that is, the second time constant T ₂ is the time until the internal combustion engine is stabilized, such as while the crankshaft is moving immediately after the starter motor is stopped). , Are wired so as to be input via the inverter 8.

Then, the drive of the starter motor M based on the ON operation of the starter switch SW described above is set as follows. That is, since the second monostable circuit B is not operating in the stage before the starter switch SW is first turned on, the logical value output from this is "0", and accordingly the AND circuit via the inverter 8. 6 is a logical value "1"
To enter. In this standby state, when the starter switch SW is turned on and the switch output "1" is input to the AND circuit 6, the AND circuit 6 outputs a logical value "1" to the switch input determination circuit 1 side. As a result, the magnet switch 3 is turned on and the starter motor M is driven. At this time, the logical value “1” output from the OR circuit 4 is also output to the second monostable circuit B side, but this logical value “1” is output by the inverter 7 as a logical value “0”, In other words, it is converted into the same state as in the non-operating state and is input to the second monostable circuit B. Therefore, the starter motor M is connected to the starter switch S.
It is driven at least during the ON operation of W, or during the time T ₁ corresponding to the time constant determined by the first monostable circuit A.

On the other hand, the starter switch S
When W is turned off or when the time constant equivalent time T _{1 of} the first monostable circuit A elapses, the signal output from the OR circuit 4 becomes the logical value "0", and the drive circuit 5 is stopped. As a result, the drive of the starter motor M is stopped, and this logical value "0" is converted into a logical value "1" by passing through the inverter 7, and the second monostable circuit B
To enter. Then the second monostable circuit B output signal of the logic value "1" to start to output only during the time corresponding T ₂ to a second time constant which the predetermined logical value "1" Is converted into a logical value “0” by the inverter 8 and input to the AND circuit 6. Therefore, after that, time T
₂ has elapsed, the output signal from the inverter 8 is a logical value "1", i.e. between the until the same logical value signal and the ON operation signal of a starter Sui Tutsi SW (i.e. during the time T _2), the starter Sui Tutsi SW Even if it is turned on, the logical value "1" is not output from the AND circuit 6,
During this time, the drive of the starter motor M is restricted.

Further, in this device, when the positive reset of the first monostable circuit A is ignited by the engine, the ignition detection circuit 9, the waveform shaping circuit 10 and the delay which constitute the reset circuit C of the present invention are delayed. By inputting through the circuit 11, the starter switch S
After the W is turned off, it is set so that the unnecessary driving of the starter motor M based on the output signal during the time T ₁ by the first time constant of the first monostable circuit A is further restricted.

In the embodiment of the present invention configured as described above, when the starter switch SW is turned on to start the engine, the drive circuit 5 is driven based on this and the magnet switch 3 is turned on, and the starter motor M However, when the starter switch ON time t is extremely short and the engine crankshaft is within the range that does not exceed the top dead center in the first compression stroke, the engine is started. Of course, it is not done, and in the conventional case, the load is suddenly applied in the opposite direction due to the compression reaction force. However, in the present invention, the starter switch SW is turned off within a very short time t. be operated, is during that time T ₁ defined Te cowpea the first time constant according to the first monostable circuit a continues to drive it in the drive circuit 5, Sutatamo M is the crankshaft is between the up beyond the first top dead center to drive. Therefore, the problem that the crankshaft receives the compression reaction force and suddenly rotates in the reverse direction can be eliminated, and the adverse effect on the gear meshing can be reliably avoided.

On the other hand, even if the starter switch SW that has been turned off is turned on again immediately after that, this time until the time T ₂ corresponding to the second time constant set in the second monostable circuit B elapses. The AND circuit 6 outputs the actuation signal from the second monostable circuit B.
Immediately after the starter motor M stops, even if the temporary starter switch SW is turned on, the gate is closed and the output signal is not output during this time T ₂ , so that the motor drive output is turned off. By the way, when the starter switch SW is turned on in a state where the internal combustion engine is not stable, such as when the crankshaft is moving immediately after the starter motor M is stopped, the starter motor drive can be regulated reliably. The starter motor M can be driven after the internal combustion engine is in a stable state.

Further, when the engine is started based on the ON operation of the starter switch SW, the ignition detection circuit 9 detects this, and the signal from the delay circuit 11 based on this detects that the first monostable circuit A is reset, Therefore, the starter motor M is immediately stopped when the starter switch SW is turned off, and the first monostable circuit A is stopped.
The driving of the starter motor M is guaranteed to be extremely natural without being driven during the time constant of.

[Advantages] In short, since the present invention is configured as described above, the ON time of the starter switch for starting the engine is extremely short, and the crankshaft reaches the first top dead center. If it is within the range that does not exceed the limit, the engine is not started and the compression reaction force is applied to the load in the opposite direction to try to return suddenly. The drive circuit continues to drive for the time determined by the time constant of
Drive until the crankshaft crosses the first top dead center. Therefore, it is possible to surely avoid the problem that the crankshaft receives the compression reaction force and suddenly rotates in the reverse direction, and the gear meshing is not adversely affected.

On the other hand, even if the starter switch that has been turned off is turned on again immediately after that, the AND circuit will continue to operate until the time determined by the second time constant set in the second monostable circuit elapses. The operation signal is output from the second monostable circuit, and the AND circuit does not output the output signal by closing the gate even if the temporary starter switch is turned on, and the motor drive output is in the off state. Therefore, it is possible to regulate the drive of the starter motor when the starter switch SW is turned on while the internal combustion engine is still unstable, such as when the crankshaft is moving immediately after the starter motor M has stopped. Becomes

Further, when the engine is ignited and started based on the ON operation of the starter switch, the signal from the reset circuit based on this detection causes the first monostable circuit to be reset. Therefore, after the engine is started, the starter switch is reset. OF
Since the starter motor is stopped immediately when the F operation is performed, there is no need to drive the starter motor for the time constant of the first monostable circuit, and a very natural drive of the starter motor is guaranteed. become.

[Brief description of drawings]

FIG. 1 shows an embodiment of a starting device for an internal combustion engine according to the present invention, and FIG. 1 is a block circuit diagram of the embodiment.
FIG. 2 is a timing chart thereof. In the figure, M is a starter motor, SW is a starter switch,
1 is a switch input determination circuit, 2 is a trigger circuit, 3 is a magnet switch, 4 is an OR circuit, 5 is a drive circuit, 6 is an AND circuit, 7 and 8 are inverters, 9 is an ignition detection circuit, 1
1 is a delay circuit, A is a first monostable circuit, B is a second monostable circuit, and C is a reset circuit.

Claims (1)

[Scope of utility model registration request] 1. A starter motor (M) is driven based on the closing of a magnet switch (3) in association with the starter switch (SW) being turned on, thereby starting an internal combustion engine. And an AND circuit (6) that outputs a signal by inputting an ON operation signal of a starter switch (SW) and a signal having the same logical value as the internal operation engine, and the output from the AND circuit (6) is connected to the internal combustion engine of FIG. Is
A switch input determination circuit (1) for determining that an output from the circuit (6) is present, and an output from the switch input determination circuit (1) are connected so as to be input, and the switch input determination circuit (1) outputs the output from the circuit (1). A trigger circuit (2) that outputs a trigger signal by output, and an output from the trigger circuit (2) are connected so as to be input, and start based on the input of the trigger signal,
A first monostable circuit (A) that outputs a signal during a first time constant that is predetermined so as to correspond to the time until the crankshaft first crosses the top dead center when the internal combustion engine is started; An OR which is connected so that outputs from one monostable circuit (A) and the AND circuit (6) are respectively input, and which outputs a signal when it is determined that logical values of input signals from these circuits are different from each other. The output of the OR circuit (4) is connected to the circuit (4) so that the magnet switch (3) is closed based on the ON signal from the circuit (4) to start the starter motor (M). ) Is provided for driving the first monostable circuit (A), and the first monostable circuit (A) outputs the first monostable circuit based on the first ignition detection accompanying the start of the internal combustion engine. Connect the reset circuit (C) for resetting The opening of the magnet switch (3) that accompanies the OFF operation of the starter switch that has been turned on causes the operation of the first monostable circuit (A) to be stopped, or the output from the reset circuit (C) to cause the opening of the first switch. This is based on the fact that the drive circuit (5) is stopped by the output signal from the OR circuit (4) due to the reset of the monostable circuit (A), and further, the OR circuit (4)
Is connected to the AND circuit (6) so as to output a signal, and the starter motor (M) is activated when the signal from the OR circuit (4) is switched to stop the starter motor (M). A starter for the AND circuit (6) is held for a second time constant predetermined to regulate the drive of the starter motor (M) based on the ON operation of the starter switch (SW) immediately after the motor (M) is stopped. A second monostable circuit (B) that outputs a signal having a logical value different from the ON operation signal of the switch (SW) is provided to turn ON from ON.
Closing the magnet switch (3) by turning on the FF operated starter switch (SW) again,
A starting device for an internal combustion engine, wherein the starting device is configured to regulate until a time corresponding to the second time constant elapses.