JP2536971B2 - Engine starter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting device for an engine having a magnet ignition device and an engine having the starting device.

[0002]

2. Description of the Related Art Conventionally, when starting an engine, it is necessary to increase the air-fuel ratio to facilitate ignition until the engine warms up. The so-called choke operation was performed. Recently, in order to automatically perform this choke operation, (a)
"Starting operation is detected by the current of the starter motor."
(B) Means such as "a mechanical switch is provided in the starting device and the switch is connected during the starting operation."

[0003]

In the former (a), when the current is flowing in the starter motor, it is judged that the starting operation is being performed and the automatic choke operation is performed. When the number is low or the magnet ignition device is not in operation, a large amount of the rich air-fuel mixture is sucked into the engine, and the fuel remains in a liquid state, which makes restarting difficult. Further, in the latter case (b), if the start operation is not set due to an operator's operation error by means of a mechanical switch, the choke operation will not be performed and the engine will not start at all, and after the engine starts, If you forget to change the switch from the starting position to the operating position, the choke operation remains active and the operation becomes unstable and unusable. Furthermore, it is necessary to switch the setting of the switch between starting, running, and stopping each time, which complicates the operation. Also, when a mechanical switch is installed in the starter, it is difficult to install it in an existing device, a new device needs to be set up, the structure becomes complicated, and the manufacturing cost becomes high. There was also a problem with durability.

[0004]

SUMMARY OF THE INVENTION The present invention is provided to solve the above-mentioned conventional drawbacks. A signal detecting circuit for detecting a current generated in a magnet ignition device and a signal detecting circuit connected to the signal detecting circuit are provided. A monostable circuit that connects a current for a predetermined time and a load circuit that connects to the monostable circuit and performs choke operation are provided.

Further, when the temperature of the engine detected by the temperature sensor is higher than a predetermined temperature, the load circuit is cut off so as to stop the choke operation.

[0006]

When the engine is started, the magnet ignition device operates to generate a current, which is input to the signal detection circuit as a signal current. This signal current is shunted and rectified by the signal detection circuit, and the output is sent to the monostable circuit. When the signal is input, the monostable circuit connects the load circuit for a preset time. Performs shot switching operation. In the load circuit, current flows from the battery to the load device such as a solenoid valve while the monostable circuit is connected, and the load device operates.

By the operation of the load device, the engine is started by performing a choke operation for increasing the concentration of the air-fuel mixture by sucking the starting fuel into the engine or decreasing the intake air amount.

When the temperature of the engine is detected by the temperature sensor and the temperature of the engine is high and choke operation is unnecessary, the load circuit is cut off, and the one-shot switching operation is performed by the monostable circuit. When the engine temperature is low, the load circuit is returned to the connected state to perform choke operation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, in which an engine 1 is constructed as follows. That is, the magnet wheel 7 and the recoil starter 8 are fixed to both ends of the crankshaft 5 which is pivotally supported by the crankcase 3,
A magnet ignition device 9 is provided near the outer circumference of the magnet wheel 7. The magnet ignition device 9 senses the magnet embedded in the outer periphery of the magnet wheel 7 to generate a primary current (not shown), and senses the primary coil to generate a high-voltage secondary current. Secondary coil (not shown) to be discharged by spark plug 13 of cylinder 11
And a circuit for connecting them. Further, a stop switch 15 for branching from the magnet ignition device 9 and short-circuiting the primary circuit to stop the discharge is provided. A monostable circuit which is connected to the magnet ignition device 9 and which is provided with a signal detection circuit 17 for detecting a current generated with the rotation of the crankshaft 3 and which is connected to the signal detection circuit 17 and connected with a current for a predetermined time 19 is provided,
A load circuit 25 is provided which is connected to the monostable circuit 19 and causes the choke device 23 to perform choke operation by the current of the battery 21.

The choke device 23 is provided as follows. The main nozzle 3 communicating with the fuel chamber 31 is provided in the intake passage 29 penetrating the inside of the carburetor 27 fixed to the cylinder 11.
3 and an overflow pipe 37 that returns from the fuel chamber 31 to a fuel tank (not shown) via a solenoid valve 35.
The starting nozzle 39 communicating with the is opened. Vaporizer 27
The manual pump 41 provided on the lower surface of the fuel tank includes a fuel tank, a diaphragm pump (not shown), a needle valve (not shown).
The fuel that is branched and sucked from the oil supply circuit 43 communicating with the fuel chamber 31 via the fuel chamber 31 is sent to the reservoir chamber 45 provided in the overflow pipe 37 via the fuel chamber 31.

A temperature sensor 47 is fixed to the crankcase 3 so that the load circuit 25 is cut off when the temperature rises to a predetermined temperature and is connected when the temperature drops below a predetermined temperature.

When the crankshaft 3 is rotated by the recoil starter 8 in order to start the engine 1, the magnet wheel 7 is rotated and the primary coil is electromotively generated. Therefore, the high voltage current generated in the secondary coil causes the spark plug 13 to discharge. Then, the air-fuel mixture ignites in the cylinder 11. The signal detecting circuit path 17 shunts and rectifies the current of the primary coil, sends the output to the monostable circuit 19, and energizes the load circuit 25 for a predetermined time in the monostable circuit 19.

When the load circuit 25 is energized, the solenoid valve 35 opens and a predetermined amount of fuel, which is stored in the storage chamber 45 and is suitable for starting, is sucked from the starting nozzle 39 into the cylinder 11 through the intake passage 29. Is started. When the engine 1 is started and a predetermined time has elapsed, the load circuit 25
Is stopped, the solenoid valve 35 is closed, the supply of fuel from the starting nozzle 39 is stopped, and the engine 1 is continuously operated by the fuel ejected from the main nozzle 33.

At the time of starting, if the temperature of the engine 1 is rising, the temperature sensor 47 operates to shut off the load circuit 25, and even if the crankshaft 3 is started, the solenoid valve 35 does not open and the starting nozzle 39 Is never supplied with fuel.

FIG. 2 shows the second embodiment,
The choke device 23 is configured as follows. Choke plate 49 for opening and closing the intake passage 29 of the carburetor 27
During the starting operation, the solenoid 51 is lowered to partially close the intake passage 29 to reduce the air sucked through the filter 53 and increase the amount of fuel sucked from the main nozzle 33 to increase the mixing ratio. Is set to a large value to facilitate ignition, and after a predetermined time has elapsed, the solenoid 51
Is stopped, and the choke plate 49 is returned to the original open state.

FIG. 3 shows a third embodiment, and the choke device 23 is constructed as follows. Vaporizer 27
The starting nozzle 39, which opens into the intake passage 29, ejects the fuel from the fuel pump 57 that sucks the fuel from the fuel tank 55. During the start-up operation, the motor 59 is rotated to eject fuel from the start-up nozzle 39 to increase the mixture ratio and start ignition for easy ignition.
To stop the supply of fuel to the starting nozzle 39.

In FIGS. 2 and 3, the same reference numerals as those shown in FIG. 1 represent the same components.

[0018]

According to the present invention, since the choke operation is automatically performed for a predetermined time by utilizing the signal from the magnet ignition device, the following effects can be obtained. (1) When the rotation speed of the starter motor is reduced or the ignition device is not operating properly, the choke operation is stopped to prevent starting failure due to overconcentration, and the engine can be started reliably. (2) Since the choke operation is automatically performed for a predetermined time, it is not necessary to manually change the choke device, and the starting operation becomes easy. (3) A new starter is not required because it can be easily incorporated into a ready-made starter. Therefore, the production cost is low,
Moreover, it is durable because it uses an electric switch .
(4) If a temperature sensor is provided, it is possible to prevent a starting failure due to excessive fuel concentration when starting the engine when the engine temperature rises.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram of a second embodiment.

FIG. 3 is a circuit explanatory diagram of a third embodiment.

[Explanation of symbols]

 1 Engine 9 Magnet Ignition Device 17 Signal Detection Circuit 19 Monostable Circuit 25 Load Circuit 47 Temperature Sensor

Claims (4)

(57) [Claims] 1. A signal detection circuit 17 connected to a magnet ignition device 9 to detect a generated current, a monostable circuit 19 connected to the signal detection circuit 17 to connect a current for a predetermined time, and the monostable circuit 19. An engine starter comprising a load circuit 25 connected to the stabilizing circuit 19 to perform choke operation. 2. The engine starting device according to claim 1, wherein the load circuit 25 is cut off to stop the choke operation when the temperature of the engine 1 detected by the temperature sensor 47 is equal to or higher than a predetermined temperature. 3. A signal detection circuit 17 which is connected to the magnet ignition device 9 to detect a generated current, a monostable circuit 19 which is connected to the signal detection circuit 17 and connected a current for a predetermined time, and the monostable circuit 19. An engine provided with a starter including a load circuit 25 connected to the stabilizing circuit 19 and performing a choke operation. 4. The engine according to claim 3, wherein the load circuit 25 is cut off so as to stop the choke operation when the temperature of the engine 1 detected by the temperature sensor 47 is equal to or higher than a predetermined temperature.