JP2816185B2 - Engine warning and stopping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is to stop an engine when a shortage of engine oil or engine coolant is detected within a predetermined time after starting the engine, and to stop the engine after a predetermined time has elapsed. The present invention relates to an engine warning and stopping device that issues only a warning without stopping the engine.

[Prior Art and Problems to be Solved by the Invention] Conventionally, general-purpose engines and the like are disclosed in, for example, JP-A-62-2637.
As disclosed in Japanese Patent Publication No. 9, when an oil level shortage such as an oil level below a reference oil level is detected, an engine is stopped by an oil level warning circuit connected to an ignition device.

Japanese Patent Application Laid-Open No. Sho 62-121833 discloses a technique for issuing a warning when an engine abnormality is detected. In this prior art, a warning device is connected in series to an engine abnormality detection circuit. In addition, power is supplied from the ignition circuit side, and when an abnormality of the engine is detected, a warning electric load including a light emitting diode (LED) is driven and the engine is stopped.

That is, in small engines such as general-purpose engines, power is supplied from the magneto to the ignition circuit.In this case, if the LED is turned on while the engine is running, the current required to light the LED is compared. Since the current is large, the current supplied to the ignition system decreases. Therefore,
The igniting energy generated in the ignition system is reduced, and the engine hunts.

For this reason, conventionally, when a shortage of the liquid amount of the engine oil or the like is detected, it is necessary to stop the engine at the same time as turning on the LED, and even if the oil level falls below the specified oil level, there is a sufficient time before the malfunction occurs. Stopping the engine immediately when there is a problem will hinder the continuation of work.

In addition, there is a type in which a separate power supply such as a lighting coil is provided for the magneto and the LED is lit by the separate power supply. However, providing a power supply separately from the magneto causes an increase in cost.

[Object of the Invention] The present invention has been made in view of the above circumstances, and when it is detected that the liquid amount of engine oil or the like has become equal to or less than a predetermined amount during operation of an engine, electricity from a magneto to an ignition power supply is detected. An engine that can issue a warning without stopping the engine by driving the load and continue the operation, and can immediately stop the engine if a shortage of liquid such as engine oil is detected when the engine is started. The purpose of the present invention is to provide a warning and stopping device.

[Means and Actions for Solving the Problems] The engine warning and stopping device according to the present invention outputs a detection signal based on a signal from a sensor when the amount of engine oil or engine cooling water falls below a predetermined amount. A sensor control section, a timer section that starts timing by starting the engine, and a short-circuiting ignition power supply from the magneto based on a detection signal from the sensor control section during timing by the timer section to stop the engine. An engine stop operation to be performed, and a warning that drives an electric load for the ignition power supply based on a timing end signal from the timer unit and a detection signal from the sensor control unit, and issues a warning without lowering ignition performance. And a warning / stop control unit for selectively executing the operation.

That is, when the engine is started, the timer starts counting time, and when a predetermined time elapses, the timer outputs a timing end signal.

In this state, when the liquid amount of the engine oil or the engine cooling water becomes equal to or less than a predetermined amount and a detection signal is output from the sensor control unit, the engine stop operation side of the warning / stop control unit operates, and the ignition power supply from the magneto is turned off. Short circuit and the engine stops.

On the other hand, after the engine is started, a shortage of the engine oil or the engine coolant water level is not detected within a predetermined period of time, and after the timer section outputs a timing end signal, the liquid level decreases and the sensor control section outputs When the detection signal is output, the warning / stop control unit performs a warning operation to drive an electric load such as a warning light. At this time, the ignition performance does not decrease due to the driving of the electric load, and the engine continues to operate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show one embodiment of the present invention.
FIG. 2 is a circuit block diagram of an engine warning and stopping device, FIG. 2 is a time chart of a warning lamp lighting operation and an engine stopping operation, and FIG. 3 is a waveform diagram of an ignition power supply.

(Configuration) In the figure, reference numeral 1 denotes an ignition circuit, to which an ignition power supply VIG is supplied from a magneto 2. A primary side of an ignition coil 3 is connected to the ignition circuit 1, and an ignition plug 4 is connected to a secondary side of the ignition coil 3.

A warning and stop circuit 5 is connected to the primary side of the ignition coil 3 in parallel with the ignition circuit 1. The warning and stop circuit 5 includes, for example, a sensor 6 for detecting the presence or absence of engine oil. It is connected.

The warning and stop circuit 5 includes a warning lamp which is connected to the ignition power supply VIG, a warning including an engine stop control unit 7,
The control unit includes a stop control unit, a control power supply unit 8, a sensor control unit 9, a switching signal generation unit 10, a signal delay unit 11, and a timer unit 12.

Further, the warning light lighting / engine stop control unit 7
It comprises an operation switching unit 7a and a lighting / stopping unit 7b, and a warning light such as a light emitting diode (LED) 7c is connected to the lighting / stopping unit 7b.

The control power supply unit 8 rectifies the ignition power supply VIG,
When the voltage from the control power supply unit 8 reaches a predetermined level and stabilizes, the timer unit 12 starts time measurement. Then, when the time measurement ends, a time measurement end signal is output from the timer section 12 to the switching signal generation section 10.

When the oil level falls below the reference oil level based on a signal from the sensor 6 for detecting the presence or absence of oil, the sensor control section 9 outputs, for example, a high-level detection signal R.
Output L.

The detection signal RL is input to the switching signal generator 10 and the signal delay unit 11. From the switching signal generator 10, the switching signal S is transmitted to the operation switching unit 7a of the warning lamp lighting / engine stop control unit 7. Output to

The detection signal RL is delayed by the signal delay unit 11 and is input as an operation signal T to the lighting / stop unit 7b of the warning lamp lighting / engine stop control unit 7.

The lighting / stopping unit 7b has two operation modes of a warning operation by lighting of the LED 7c and an engine stopping operation by short-circuiting the ignition power supply VIG from the magneto 2, and the timer unit 12 is counting the time. When the detection signal RL is input to the switching signal generator 10,
, The operation switching unit 7a determines the state of the engine stop mode.

On the other hand, if the detection signal RL is input to the switching signal generation unit 10 after the end of the time counting by the timer unit 12, the lighting / stop unit 7b is determined to be in the LED lighting mode by the operation switching unit 7a. You.

(Operation) Next, the operation of the embodiment having the above configuration will be described based on the time chart of FIG.

First, when the engine is started, the ignition power source VIG is output from the magneto 2 and when the engine speed reaches a predetermined speed, the voltage rectified and smoothed by the control power source unit 8 becomes a predetermined voltage level. And stable.

Then, time measurement is started by the timer unit 12 and, for example, a shortage of oil is detected by the sensor 6 until a predetermined period of time elapses and the timer unit 12 outputs a time measurement end signal. When the high-level detection signal RL is output from 9, the detection signal RL is input to the switching signal generation unit 10 and the signal delay unit 11.

The switching signal generation unit 10 outputs a switching signal S to the operation switching unit 7a of the warning lamp lighting / engine stop control unit 7,
The operation mode of the lighting / stop unit 7b is set to the engine stop mode (see the broken line in FIG. 2).

At this time, as for the activation signal T to the lighting / stop unit 7b, the detection signal RL is sent by the signal delay unit 11 for a delay time Td.

As a result, the ignition power supply VIG is short-circuited by the lighting / stopping unit 7b, the primary side of the ignition coil 3 is lowered to the ignition limit voltage or less, and the engine is stopped.

That is, if the sensor control unit 9 detects an oil shortage within a predetermined time after the engine is started, the warning lamp lighting / lighting / stopping unit 7b of the engine stop control unit 7 is set to the engine stop mode side. Then, an operation signal is input to the lighting and stopping section 7b with a delay sufficient for the operation mode to be determined, that is, a delay of the delay time Td, and the primary side of the ignition coil 2 is lowered to the ignition limit value or less and malfunctions. The engine stops without fail.

On the other hand, after the engine is started, the oil shortage is not detected until the timing end signal is output from the timer unit 12, and the amount of oil gradually decreases while the engine is operating.
When the oil level falls below a predetermined reference oil level, the sensor control section 9 outputs a high-level detection signal RL.

Then, in response to the high-level detection signal RL, the switching signal generator 10 outputs the switching signal S to the operation switching unit 7a of the warning lamp lighting / engine stop control unit 7, and the lighting / stop unit 7b sets the LED lighting mode. It is switched to the side.

At this time, as described above, since the detection signal from the sensor control unit 9 is input to the lighting / stop unit 7b with a delay RL from the signal delay unit 11 by the delay time Td, the LED 7c does not malfunction. It is lit.

In the lighting / stop section 7b, the arc discharge region TIG of the ignition plug 4 in the ignition region of the ignition power supply VIG by the ignition circuit 1, for example, in the region due to the capacitance component as shown in FIG.
The phase is shifted from C, and the LED 7c is turned on in the late TIGL of the glow discharge region due to the inductive component.

Therefore, the loss of ignition energy due to the lighting of the LED 7c is slight, and does not cause a decrease in ignition performance.

That is, after the engine is started, the oil shortage is not detected within a predetermined time, and after the timer section 12 outputs the timing end signal, and the oil falls below the reference oil level, the engine is not stopped and the LED 7c is stopped. Only the ignition operation is performed, and the operation can be continued.

Note that the present invention is not limited to the embodiment. For example, the sensor 6 may be one that detects cooling water, and a warning may be given by an electric load equivalent to the LED 7c such as an hour meter. .

Further, in the warning light lighting / engine stop control unit 7, the operation mode of the lighting / stop unit 7b is determined to be the engine stop mode by keeping the switching signal to the operation switching unit 7a at a low level after the engine is started. And timer section
When the operation mode is switched to the LED lighting mode by the high-level posting end signal from 12, the switching signal generation unit 10 and the signal delay unit 11 can be omitted.

[Effects of the Invention] As described above, according to the present invention, the engine is stopped when the liquid amount of the engine oil or the engine cooling water is detected to be equal to or less than a predetermined amount within a predetermined time after the engine is started, Since the warning operation is only performed after the predetermined time has elapsed even if the liquid amount becomes equal to or less than the predetermined value, the replenishment can be notified in advance with an inexpensive configuration by setting the liquid amount detection level with a margin. Until refueling, work can be continued without stopping the engine.

Then, after the work is completed, the engine is stopped, for example, even if the engine is started again after forgetting to replenish, the engine can be stopped immediately upon detecting a shortage of the liquid level, and an excellent effect such as occurrence of abnormality can be prevented beforehand. Is played.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention. FIG. 1 is a circuit block diagram of a warning and stopping device for an engine, and FIG.
FIG. 3 is a time chart of a warning lamp lighting operation and an engine stop operation, and FIG. 3 is a waveform diagram of an ignition power supply. 2 ... Magnet 6 ... Sensor 7 ... Warning lamp lighting / engine stop control unit 7c ... Light emitting diode 9 ... Sensor control unit 12 ... Timer unit VIG ... Ignition power supply

Claims (1)

(57) [Claims] 1. A sensor control unit for outputting a detection signal based on a signal from a sensor when the amount of engine oil or engine cooling water becomes equal to or less than a predetermined amount, and a timer unit for starting timing by starting the engine. An engine stop operation for short-circuiting the ignition power supply from the magneto to stop the engine based on a detection signal from the sensor control unit during the time counting by the timer unit, and a timing end signal from the timer unit and A warning / stop control unit that selectively executes a warning operation of driving an electric load to the ignition power supply based on a detection signal from the sensor control unit and performing a warning without lowering ignition performance. A warning and stopping device for an engine, comprising: