JPS6225847B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a lubricating oil alarm device for an engine that issues an alarm when lubricating oil in the engine decreases below a predetermined amount.

[Conventional technology and problems]

When an engine, especially a 4-cycle engine, is equipped with a large-capacity gasoline tank, the amount of lubricating oil becomes insufficient and accidents such as seizure occur. For this reason, lubricating oil warning devices are installed to issue an alarm when the lubricating oil (hereinafter simply referred to as oil) drops below a predetermined level. There were problems in that there were no such equipment, that it was difficult to replenish oil into the crankcase, and that seizing occurred when the engine was started without replenishing oil after it had been stopped. In addition, as a prior art technology, a switch is installed that turns on when the engine oil level in the engine oil pan drops below a specified oil level, and the engine is automatically stopped at the same time as a warning is issued, making it impossible to start the engine unless this condition is restored. There is Utility Model Publication No. 51-19139. If the system automatically stops at the same time as the warning is issued, there is a problem in that an unexpected accident may occur in an external device that operates using the power source from the engine. In addition, even if the engine is automatically stopped at the same time as an alarm is generated in response to an abnormality occurring due to a drop in the level of lubricating oil in the engine, if the engine is not stopped stably, the power source from the engine will be lost. There is a problem in that unexpected accidents may occur with external devices that operate in the system. For this reason, the prior art was not practical. The present invention was made in order to solve such problems, and it is provided with a separate oil tank that supplies oil to the crankcase, placed in a position that facilitates oil replenishment, and furthermore, By generating an alarm when the oil level in the tank decreases, the alarm can be issued with sufficient margin.In addition, an engine stop circuit is installed to stably stop the engine, and if the oil level in the tank decreases, it will not recover. The object of the present invention is to provide a highly safe lubricating oil warning device for an engine that prevents the engine from being restarted even if an attempt is made to start the engine.

[Means to solve the problem]

In order to achieve the above object, in the present invention,
A stop means has a switch element with a gate pole connected to the ignition circuit of the engine via a rectifier, and makes the ignition circuit in a state incapable of ignition by conduction of the switch element, and a switch with a gate pole in the stop means when the engine is running. A manual switch that applies an operating current to the gate electrode of the element and operates a stop means to stop the engine, an oil tank that supplies lubricating oil to the crankcase, and an oil level in the oil tank that is below a predetermined level. an oil sensor contact whose contact is activated when the voltage drops to 0.1, an alarm device, a capacitor that stores the voltage generated when the engine is running, and a transistor circuit biased by the voltage of the capacitor connected in series with the sensor contact and the alarm device. A lubricating oil warning device for an engine is constituted by a control circuit and a diode circuit that connects the output of the transistor circuit to the gate pole of the gate pole switch element.

[Effect]

According to this, the stopping means has a switch element with a gate pole connected to the ignition circuit of the engine via a rectifier, and makes the ignition circuit in a state incapable of ignition by conduction of the switch element, and the stopping means when the engine is running. The engine stop means consists of a manual switch that applies an operating current to the gate pole of a switch element with a gate pole and operates a stop means to stop the engine. system (oil tank, oil sensor contacts, alarm device, control circuit,
and diode circuit), each function operates independently during engine operation. In addition, when the abnormality does not recover when the engine is restarted after stopping, that is, when the sensor contact that detects the abnormality in the level of lubricating oil in the engine is activated,
Even if a restart is performed, the output of the control circuit is applied from the alarm system circuit system to the gate pole of the gate pole switch element via the diode circuit, and the gate pole switch element is operated. It is designed to disable ignition and prevent restarting unless the abnormal condition is recovered.

【Example】

Hereinafter, explanation will be given with reference to the drawings. In FIG. 1, reference numeral 1 indicates a crank case, 2 indicates a pulse pump 3, a fuel tank, and 4 indicates an oil tank provided in the fuel tank 3.
It has an injection port 5 at the top, from which oil can be replenished. The oil tank 4 is connected to the suction port of the pulse pump 2 through a pipe 6, and the oil discharge pipe 7 of the pulse pump 2
is opened into the crankcase 1, and the tip of the negative pressure outlet pipe 8 is immersed in the oil 10. A pulsating negative pressure is generated in the crankcase 1 by the operation of the engine, and when the oil decreases to a predetermined level or less, the tip of the negative pressure outlet pipe 8 is exposed, and pulsating negative pressure is applied to the pulse pump 2. Therefore, the pulse pump 2 is activated to supply oil from the oil tank 4 into the crankcase 1. When the oil level rises and the tip of the negative pressure outlet pipe 8 sinks, the pulse pump 2 stops operating. In this way, the oil level inside the crankcase 1 is always maintained at a substantially constant level. An oil sensor 11 is provided at the bottom of the oil tank 4. As shown in FIG. 2, the oil sensor 11 includes a guide tube 12 vertically fixed to the bottom of the oil tank 4, a float FL slidably attached to the guide tube 12, and a float FL provided inside the guide tube 12. Reed switch Rs as oil sensor contact
and float FL to close the reed switch Rs.
A reed switch Rs is closed when the oil 10 drops to a predetermined level by a magnet 14 provided inside. The reed switch Rs is connected to the engine stop device 15 as described later, and is adapted to operate an alarm device (alarm such as a buzzer) Bz. Hereinafter, with reference to FIG. 3, the engine stop device 15
I will explain about it. In the figure, A is an engine ignition system having an ignition coil, a generator coil, etc.;
B is a stop means for reducing the ignition voltage of the ignition coil A to below the ignition limit value by the operation of a switch C or a detection means D, which will be described later, and stops the operation of the ignition device A; C is an automatic return type normally open switch; The contact is closed only while the operating (pressing) force is being applied, and a stop command signal a is sent to the stop means B. D is a detection means that detects various abnormal conditions related to engine operation and operates an alarm or display, and also causes a stop means B to stop the engine in conjunction with the action of a power supply (power supply) circuit P, which will be described later. Send command signal a'. E is a holding means that receives one of the above-mentioned stop command signals and holds the operation of the stop means B for a predetermined time; P is a power supply means (circuit) that generates voltage and supplies power to the detection means D when the engine is running; When the detection means D is activated while the ignition device A is in normal operation, an alarm or the like is immediately generated, but a stop command signal a' is not sent to the stop means B. Then, the user etc. confirms the content of the alarm and operates the switch C as necessary, so that the stop means B receives the stop command signal a from the switch C, and the ignition device A
This can be stopped by reducing the ignition voltage below the ignition limit value. Furthermore, since the holding means E holds the operation of the stop means B for the required time regardless of the operation of the normally open switch C or the detection means D when the stop command signal a or a' arrives, the operation of the ignition device A is ensured. will be stopped. On the other hand, when the operation of the ignition system A is stopped, if the detection means D is in an inoperable state, that is, the abnormality has been recovered, normal restart can be performed, but if the detection means D is not recovered, a stop command signal a' is sent from the detection means D. is sent out and operates the stop means B in the same manner as the operation of the switch C, so restarting is not possible. Hereinafter, the present invention will be explained in detail using the circuit diagram shown in FIG. In the figure, IGC is the ignition coil,
SP is a discharge gap, CP is a contact breaker, and these form the ignition device A. A rotating magnet G rotated by the engine IN is magnetically coupled to the ignition coil IGC, and when the engine IN rotates, an alternating current voltage is generated. Similarly, the power generation coil
AC voltage is also generated in EX-W and the generator coil L-W of the power supply circuit P, forming a so-called generator engine. Rec is a full-wave rectifier that rectifies the AC output of the generator coil EX-W or ignition coil IG, Th is a thyristor with a gate pole (hereinafter referred to as thyristor), and impedance elements such as resistors R ₁ and R ₂ are connected in series. is connected between the DC output terminals of the rectifier Rec to form the stop means B, and conduction of the thyristor Th short-circuits the AC output voltage of the coil EX-W or the ignition coil IGC, thereby reducing the voltage of the ignition coil IGC. Reduced to below the ignition limit value,
The engine is now stopped. A series-connected diode D ₁ and a capacitor C ₁ are connected across the resistor R ₂ , and a connection point between the diode D ₁ and the capacitor C ₁ is connected to the gate of the thyristor Th via a resistor R ₃ . to form the holding means E of the stop means B. The switch SW ₁ forming the switch C is an automatically reset normally open switch, and is connected between both ends (anode, cathode) of the thyristor Th or between the anode and the gate. By closing the switch SW ₁ , a gate signal ( A stop command) is applied. In this embodiment, the power supply circuit P of the detection means D utilizes the AC output of the generator coil L-W.
_D3 is a rectifying diode, Bz and S are an alarm device such as a buzzer, and a semiconductor switching element, which are connected in series and drive the alarm Bz when the switching element S is conductive. R ₄ , R ₅ , R ₆ , R ₇ ,
Q, C ₂ are a resistor, a transistor, and a capacitor that together with the contact point Rs of the oil sensor form the control circuit of the semiconductor switching element S;
R ₆ and capacitor C ₂ form an integrating circuit that uses the DC output of rectifier diode D ₃ as an input source, and its value is set sufficiently large, and the connection point between resistor R ₆ and capacitor C ₂ is the base of transistor Q. When the charging voltage of the capacitor _C2 reaches a predetermined value (voltage between the base and emitter of the transistor Q), a base current is supplied to the transistor Q. Further, the sensor contact has one end connected to the rectifier diode.
Connected to the DC output side of D ₃ , and the other end is connected to resistors R ₅ and R ₄
It is connected to the collector of transistor Q via. If the sensor is closed and the base current is supplied to the transistor Q during this time, then
Transistor Q becomes conductive, making switching element S conductive. The detection means D is formed by the above configuration. Next, _D2 is a diode connected between one end of the detection means D, that is, the connection point between the collector of the transistor Q and the resistor _R4 , and the gate of the thyristor Th. When the base current is not supplied and it is in a non-conducting state, a gate signal (stop command) is applied to the thyristor Th via the diode _D2 . Next, the operation of this circuit will be explained. During normal engine operation During normal operation, ignition system A operates normally.
A predetermined alternating current voltage is generated in the generator coils EX-W and L-W. And in the detection means D,
The integration circuit of resistor R ₆ and capacitor C ₂ is powered through diode D ₃ , and after a predetermined time, the integrated value, that is, the charging voltage of capacitor C ₂ , becomes the base-emitter voltage (V _BE ) of transistor Q. and supplies the base current to the transistor Q. However, since the sensor is inactive, the transistor Q is in an off state because the emitter and collector are not supplied with power, and the detection means D passes through the diode _D2 .
No signal is sent. On the other hand, the stop means B does not operate because the thyristor Th is non-conductive. Therefore, ignition device A continues normal operation. Operation of detection means D during engine operation When the engine oil level OL falls below a predetermined value, the float FL switches the reed switch Rs.
Go down to the position and turn it on (when the oil level is sufficient, float FL is at the top and reed switch Rs is off). Therefore _, since the base current is already supplied to the transistor Q of the detection means _D , when the sensor switch _Rs is turned on, the transistor The collector current (IC) of Q flows, and the collector and emitter are immediately brought into conduction. Therefore, the voltage generated across the resistor _R4 is applied between the gate and cathode of the semiconductor switching element S, making the switching element S conductive. As a result, a current flows through the path of power supply circuit P→diode _D3 →buzzer Bz→semiconductor switch element S, and the alarm operation of buzzer Bz is performed.
However, since the detection means D transistor Q is in a conductive state and the potential between its emitter and collector is close to zero, no stop command signal is sent through the diode _D2 , and the thyristor Th of the stop means B Still inactive, the engine continues to operate. Operation of stopping means and holding means When the user confirms the alarm etc. and closes it by applying operating force (pressing force) of switch SW ₁ as necessary,
During that time, depending on the voltage generated by the generator coil EX-W or the ignition coil IG, the rectifier Rec → resistor R ₁ → switch
The said capacitor C ₁ in the path of SW ₁ → capacitor C ₁
is charged. Then, from the point when the voltage across the resistor R ₂ (impedance element) becomes lower than the charging voltage of the capacitor C ₁ , the charge on the capacitor C ₁ changes from the resistor R ₃ → the gate and cathode of the thyristor Th → the resistor R ₂ → the capacitor C ₁ , thereby supplying a gate current to the thyristor Th and turning the thyristor Th into a conductive state. Once the thyristor Th conducts, the rectifier Rec→
The generated voltage of the generating coil EX-W is short-circuited via the resistor _R1 → thyristor Th → resistor _R2 , and the voltage of the ignition coil IGC is reduced to below the ignition limit value.
Even if the operating force of switch SW ₁ is released and it automatically returns, capacitor C ₁ is charged via diode D ₁ by the voltage generated across resistor R ₂ when thyristor Th is conductive, and resistor R ₃ is charged. The gate current is supplied to the thyristor Th by discharging at a predetermined time constant. As a result, the thyristor Th is maintained in a conductive state for a required period of time, during which time the engine is reliably stopped. After the engine stops, no voltage is generated in the generator coil EX-W, so the thyristor Th
shifts to the OFF state, and the residual charge in the capacitor _C1 is discharged via the resistors _R3 and _R2 . Engine restart operation when the detection means is activated After the engine stops, oil is filled and floats.
When FL rises and the reed switch Rs returns to the OFF state, the engine can perform the normal operation described above. However, this did not return;
Therefore, when starting with the reed switch Rs in the ON state, the generator coil will turn on as the engine rotates.
A slight voltage is generated between EX-W and L-W. Therefore, in the detection means D, power supply circuit P → diode D ₃ → reed switch Rs → resistors R ₅ , R ₄ → circuit around the emitter and collector of transistor Q, and diode D ₃ → resistor R ₆ → capacitor C A circuit around ₂ is formed. However, since the integral value of the resistor R ₆ and the capacitor C ₂ is set sufficiently large, it takes time for the charging voltage of the capacitor C ₂ to reach the base-emitter voltage (V _BE ) of the transistor Q. , during this period, transistor Q maintains a non-conducting state. So during this time,
The current in the circuit that goes around the reed switch Rs is bypassed through the resistors R ₅ and R ₇ → the gate and cathode of the semiconductor switching element S, making the switching element S conductive and activating the alarm Bz. ₄ → Diode D ₂ → Resistor R ₃ → Gate of thyristor Th, cathode → Power is supplied through the low resistor R ₂ to make the thyristor Th conductive.
Therefore, the stopping means and the holding means are activated again, so that restarting of the engine is prevented.

【Effect of the invention】

As is clear from the above description, according to the present invention,
Since the oil tank is located close to the fuel tank, it is easy to replenish the oil.Furthermore, the alarm is issued by detecting the oil level in the oil tank, so the alarm can be issued with sufficient time. It can be carried out. Further, after the engine is stopped due to the warning, the engine cannot be started unless oil is replenished, thereby preventing the risk of engine seizure.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an oil level detection device according to the present invention, FIG. 2 is a diagram showing an oil sensor, FIG. 3 is a block diagram of an engine stop device, and FIG. 4 is a control circuit diagram. 1... Crank case, 2... Pulse pump,
4...Oil tank, 11...Oil sensor, A
...Ignition device, B...Stopping means, C...Normally open switch, D...Detection means, Bz...Alarm device.

Claims (1)

[Claims] 1. Stopping means having a switch element with a gate pole connected to the ignition circuit of the engine via a rectifier, and rendering the ignition circuit in a state incapable of ignition by conduction of the switch element, and a gate pole attached to the stop means when the engine is running. A manual switch that applies an operating current to the gate pole of a switch element to actuate a stop means to stop the engine, an oil tank for supplying lubricating oil into the crankcase, and an oil level in the oil tank that is at a predetermined level. An oil sensor contact that activates when the voltage drops below, an alarm device, and a capacitor that stores the voltage generated when the engine is running.
An engine comprising a control circuit in which a transistor circuit biased by the voltage of the capacitor is connected in series with the sensor contact and the alarm device, and a diode circuit that connects the output of the transistor circuit to the gate pole of the gate pole switch element. Lubricating oil warning device.