JPS6220657Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an alarm device that detects the amount of lubricating oil and issues an alarm in a motorcycle or the like.

(Prior Art) Conventionally, a lubricating oil level alarm device connects an alarm lamp to an oil level switch provided in an oil pan, and lights up the alarm lamp when the oil level drops below a set position. However, in the above warning device, the warning lamp lights up only when the oil level falls below the set position, so the oil level may change depending on the engine speed or driving conditions such as sudden acceleration or braking. Due to the fluctuation, even if the light is turned on, it may turn off afterwards, which has the disadvantage that it is easy to overlook the light being turned on.

Therefore, there is an alarm device in which an oil level switch is connected to an alarm lamp via a hold circuit so that once the alarm lamp is turned on, it remains lit.

(Problem that the invention aims to solve) However, the above warning device has the disadvantage that it is not possible to determine the operating state when the light is on, so the degree of abnormality cannot be determined, and the engine must be stopped to check using the oil gauge. It was hot. That is,
If the oil level is set low without fully taking into account fluctuations in the oil level, the warning lamp will not light up during gentle acceleration/deceleration and the oil level will be judged as normal, but the actual oil level will be subject to rapid acceleration/deceleration. During operation, there may be an abnormal situation in which the lubricating oil suction port is exposed above the oil level, and in this case, sufficient lubrication is not performed, which may cause seizure of the bearings, etc. On the other hand, if the oil level is set high enough to account for fluctuations in the oil level, there will be problems such as a warning lamp lighting up even though there is a sufficient amount of oil during vigorous driving.

Furthermore, as a means to reduce the effects of oil level fluctuations, there is a method of installing an oil level switch in a compartment that communicates with the inside of the oil pan through pores, but it is not effective against gradual oil level fluctuations. It was nothing.

As described above, the conventional lubricating oil warning device has a problem in that it may operate regardless of whether the oil level is correct or incorrect due to changes in the oil level during operation, and may issue false alarms during operation.

(Means for solving the problem) A starting operation detection circuit that detects the engine starting operation and issues a signal, and an oil level that detects the oil level in the oil pan and issues a signal when the oil level drops below a set position. A surface detection circuit, a gate circuit that issues an activation signal upon application of a starting operation detection signal and an oil level detection signal, an alarm circuit that is activated by the activation signal of the gate circuit, and a hold that maintains the alarm circuit in an activated state. The gate circuit is composed of a circuit and a gate circuit.
A lubricating oil amount alarm device for a motorcycle, etc., which responds only to an oil level detection signal applied together with a starting operation signal, and remains inactive in response to a detection signal based on a change in oil level during driving. It is related to.

(Function) By linking the starting operation detection circuit and the oil level detection circuit to a gate circuit, and linking the gate circuit to the alarm display circuit and the hold circuit, a short time period when the engine is started when the oil level is stable. By detecting the oil level only at the engine, the oil level can be accurately detected, and in the event of an abnormal oil level, an alarm will be issued until the engine is stopped.

(Example) Hereinafter, the configuration of the present invention will be described with reference to the drawings.

<Embodiment 1> As shown in FIGS. 1 and 2, 1 is a lubricating oil amount alarm device mounted on a motorcycle, etc., which includes an engine starting operation detection circuit 2, a lubricating oil level detection circuit 3, a gate circuit 4, a hold circuit 5, and an alarm display circuit 6.

In the starting operation detection circuit 2, a power supply 7, an ignition switch 8, and resistors 11 and 12 are connected in series, and a capacitor 13 is branch-connected between the resistors 11 and 12 to constitute a charging circuit 2a. An output terminal 14 of the transistor 2a is connected to a base terminal of a switching transistor 15.

As a result, when the ignition switch 8 is closed (starting operation is performed), the capacitor 1
3, and when the base voltage of the transistor 15 is low immediately after the start of charging, the transistor 15 is in a non-conductive state, and charging is completed after a predetermined period of time has elapsed, and a predetermined base voltage is applied to the transistor 15. At this time, the transistor 15 becomes conductive. That is, the transistor 15 remains non-conducting only for a very short time immediately after the starting operation. In the figure, numeral 9 is a diode for circuit protection during reverse connection, and numeral 10 is a capacitor for noise prevention.

The oil level detection circuit 3 is composed of an oil level switch 16 provided in the oil pan and connected to the gate circuit 4, and the oil level switch 16 is closed when the oil level in the oil pan is above a set position. , which opens when the oil level drops below the set position, and the set position is set based on the point before the oil level drops due to the drive of the oil pump.

The gate circuit 4 includes an input terminal 4a connected to the collector terminal of the transistor 15, an input terminal 4b connected to the oil level detection circuit 3, and a resistor 17 provided between the ignition switch 8 and the input terminal 4b.
and an output terminal 4c, and input terminals 4a, 4
It outputs only when the two switching elements connected to b, ie, the transistor 15 and the oil level switch 16, are both non-conductive, and does not output at other times. As a result, the transistor 15 is in a non-conducting state for a very short time immediately after starting, and the output terminal 4 is only when the oil level switch is open.
A signal current is applied to the hold circuit 5 via c, and no signal is generated otherwise. In other words, it detects only the oil level detection signal that is applied together with the starting operation signal and issues a signal only when the oil level is below the set value.
For an oil level detection signal based on a change in oil level during operation, a detection timing selection means is provided to keep the oil level in a non-operating state.

In the hold circuit 5, resistors 19, 20 and a transistor 21 are connected in series to a power supply 7 via an ignition switch 8, and an output terminal 4c of the gate circuit 4 is connected to a power source 7 via a diode 22, a resistor 23, and a Zener diode 24 for preventing malfunction. are connected to the base terminals of the transistors 21, the emitter and base terminals of the transistor 27 are connected in parallel with the resistor 19, and the collector terminal of the transistor 27 is connected to the input side of the resistor 23 via the diode 30, The collector terminal of the transistor 27 is connected to ground via resistors 28 and 29 provided in series. As a result, when a signal is applied from the gate circuit 4, the transistor 21 becomes conductive, and accordingly, the transistor 27 also becomes conductive, and the output of the transistor 27 is applied to the base of the transistor 21 via the diode 30. A self-holding circuit is formed, and the signal is output from the output terminal 5a provided between the resistors 28 and 29 until the engine is stopped, that is, the ignition switch 8 is opened. In addition, 1
8 and 25 are capacitors for preventing malfunction, and 26 is a resistor.

The alarm display circuit 6 includes an alarm lamp 31, an overload prevention resistor 32, and a transistor 33 connected in series to a power supply 7 via an ignition switch 8.
The output terminal 5a of the hold circuit 5 is the transistor 3
In response to an input signal from the hold circuit 5, the transistor 33 is made conductive, and the alarm lamp 31 is turned on.

Next, the alarm operation will be explained. First, when the ignition switch 8 is closed, charging of the capacitor 13 of the starting operation detection circuit 2 begins, and at this point, the base voltage of the transistor 15 is low and is in a non-conducting state. On the other hand, the oil level switch 16 opens and closes depending on oil level fluctuations regardless of engine drive stoppage, etc., but the ignition switch 8
Immediately after closing, the oil level is stable, and at this time, if the oil level is above the set position, it is in the closed state, and the current on the collector side of the transistor 15 changes to the oil level switch 16.
The gate circuit 4 is grounded through the hold circuit 5, and no output is generated from the gate circuit 4 to the hold circuit 5. Next, when the oil level is lower than the set position, the oil level switch 16 is opened. At this time, if the ignition switch 8 is immediately turned on, the transistor 15 will not operate because the required base voltage cannot be obtained to charge the capacitor 13, and therefore the power supply voltage will be passed through the resistor 17 to the hold circuit 15. is applied to After that, charging of the capacitor 13 progresses, and the transistor 1
When a predetermined base voltage is applied to the gate circuit 5, the transistor 15 becomes conductive, and the voltage through the resistor 17 is grounded. Output to 5 is stopped. That is, although the signal current is applied to the hold circuit 5 only when the oil level switch 16 is opened immediately after starting, the switch 1
Application of the signal current to the hold circuit 5 is stopped not only when the switch 6 is closed, but also after a predetermined period of time has elapsed after starting, regardless of whether the switch is opened or closed.

Next, the hold circuit 5 will be explained. When the signal current from the gate circuit 4 is not applied, the transistor 21 is not given the required base voltage and becomes non-conductive. Therefore, the transistor 27 has a base voltage and an emitter voltage. are approximately equal to each other, the voltage becomes non-conductive, and no output current is obtained at the output terminal 5a for the alarm display circuit 6. Therefore, in the alarm display circuit 6, the transistor 33 is not given the required base voltage. It becomes a non-conducting state, the lamp 31 does not light up, and the normal oil amount is displayed.

Next, when an output current is applied from the gate circuit 4, the transistor 21 becomes conductive, and accordingly, the transistor 27 also becomes conductive due to a predetermined base voltage.
1 is applied with a required base voltage to close a so-called self-holding circuit, and at the same time, a required output current is applied from the output terminal 5a to the base of the transistor 33 of the alarm display circuit 6, making the transistor conductive. , the lamp 31 will continue to light up to display the abnormal oil amount.

The above lighting display is activated by the hold circuit 5 when the engine is stopped, that is, when the ignition switch 8 is opened.
will continue until it is released.

<Embodiment 2> In this embodiment, as shown in FIG. 3, a starting operation detection circuit 34 and an oil level detection circuit 35 are connected to an AND gate circuit 36. The starting operation detection circuit 34 is connected to a power source 37 and an ignition switch 3.
8 and a differential circuit 39 are connected in sequence to the gate circuit 36, and when the ignition switch 38 is closed, one pulse is output.
Further, the differentiating circuit 39 includes one capacitor 40 and two resistors 41 and 42.

The oil level detection circuit 35 consists of a power supply 37, a resistor 43, and an oil level switch 44 connected in this order.
The oil level switch 44 and the cathode terminal of the diode 45 of the gate circuit 36 are connected. The oil level switch 44 is closed when the oil level is above a set value, and opened when the oil level falls below the set position.

The gate circuit 36 is provided with a diode 46 in parallel with the diode 45, and each anode side is connected to the power supply 37 via a resistor 47.
The output terminal 70 is provided on the anode side of the diode, and when at least one of the diodes 45 and 46 is in a conductive state, it is grounded and no output current is obtained at the output terminal 70, but it is It is designed so that an output current can be obtained when it is conductive.

The hold circuit 48 is composed of a thyristor 49, and the gate circuit 3 is connected to the gate terminal of the thyristor 49.
6 output terminals 70 are connected.

The alarm display circuit 50 connects an alarm lamp 51 to the power supply 37.
is connected to the anode terminal of the thyristor 49.

Next, the alarm operation will be explained. When the ignition switch 38 is closed, the gate circuit 36
One pulse is input to the diode 46, and the grounding of the diode 46 is cut off. At the time of input, if the oil level is above the set position, the oil level switch 44 is closed and the circuit is grounded, so the circuit 36 does not output and the oil level has fallen below the set position. Then, the oil level switch 44 is opened, so that the required output current is obtained at the output terminal 70 of the gate circuit 36. The output current generated at the output terminal 70 of the gate circuit 36 is transferred to the thyristor 49 of the hold circuit 48.
is applied as a trigger, thereby making the thyristor 49 conductive and lighting the alarm lamp 51 to display the abnormal oil amount.

FIG. 4 shows another starting operation detection circuit 52, in which a generator 53, a resistor 54, and a one-shot multivibrator 55 are connected in this order.
When the engine starts, the generator 53 emits a sine wave, and this sine wave causes the multivibrator 55 to output a single rectangular pulse. The voltage is applied to the diode 46 of the gate circuit 36 shown in FIG.

FIG. 5 shows another oil level detection circuit 56, which is constructed by connecting the power supply 37, the oil level switch 57 and the resistor 58 in sequence. The oil level switch 57 and the resistor 58 are connected to the gate circuit 36. The oil level switch 57 opens when the oil level is above a set position and closes when the oil level falls below the set position. Therefore, when the oil level is above the set value, the third
The diode 45 of the gate circuit 36 shown in the figure is grounded, and no output current is obtained from the output terminal 70. However, when the oil level is below a set value, the switch 57 is closed to prevent the diode 45 from being grounded.
When the start-up pulse signal is applied to the diode 46 and the diode 46 is also prevented from being grounded,
A required output current is obtained at the output terminal 70 of the gate circuit 36.

6 and 7 show other hold circuits 59, 6.
The hold circuit 59 in FIG. The collector terminal is connected to the power source 37 via the alarm lamp 51, and the emitter terminal is grounded. The base terminal of the other transistor 62 is connected between the alarm lamp 51 and the transistor 61, the emitter terminal is connected to the power supply 37 via the resistor 64, and the collector terminal is connected between the transistor 61 and the diode 63. A self-holding circuit is constituted by the transistor 61 and the transistor 62. Accordingly, both the transistors 61 and 62 are kept conductive by the input from the gate circuit 36, and the alarm lamp 51 is continuously lit.

The hold circuit 60 in FIG. 7 is a combination of a relay 65 that is activated by input from the output terminal 70 of the gate circuit 36 and a self-holding relay 66. One of the relays 65 is connected to the input terminal, and the The relay switch 65a is connected in series with the power supply 37, the alarm lamp 51, and the other relay 66, and the relay switch 66a is connected to the relay switch 65.
The gate circuit 36 is configured by being connected in parallel with a.
Relay switches 65a, 66a are activated by input from
is closed, one relay switch 66a is held, and the alarm lamp is lit continuously.

In the first and second embodiments, the gate circuit is not limited to that in the embodiment, and the signal sources in the starting operation detection circuits 2 and 34 include the ignition switches 8 and 38 as well as the cell starter switch, Once the engine has started, it may be a switch that does not operate or operate until the engine stops, such as a switch that is linked to the engine lever, and the starting operation detection circuit 5
In addition to the generator 53, the signal source in step 2 may be any source that can detect engine starting, such as oil pressure or intake negative pressure. Furthermore, warning lamp 2
9, 51 may be replaced with an alarm such as a buzzer.

(Effects of the invention) As described above, the invention includes a starting operation detection circuit that emits a pulse signal at the time of a starting operation, and an oil level detection circuit that detects the presence or absence of a predetermined amount of lubricating oil and issues a signal. Accurate oil level is detected by applying signals from both circuits to the gate circuit and detecting the oil level at the time of engine startup when the oil level is stable. A signal is not emitted from the gate circuit, but when the oil level is below a predetermined level, a signal is emitted from the gate circuit, and the emitted signal is self-held in the hold circuit until the engine stops, and the alarm circuit is made conductive. In addition to keeping lamps lit or alarms operating,
Since the gate circuit is provided with a canceling means that is not affected by input signals based on oil level fluctuations after startup, it is possible to reliably prevent false alarms during operation.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIGS. 1 and 2 show Embodiment 1. FIG. 1 is a block diagram of the lubricating oil amount alarm device, FIG. FIG. 3 is an electric circuit diagram of the lubricating oil level alarm device of Embodiment 2, FIG. 4 is an electric circuit diagram of another starting operation detection circuit, and FIG. 5 is an electric circuit diagram of another oil level detection circuit.
FIGS. 6 and 7 are electrical circuit diagrams showing other hold circuits, respectively. 1...Lubricating oil amount alarm device, 2...Starting operation detection circuit, 3...Oil level detection circuit, 4...Gate circuit,
5...Hold circuit, 6...Alarm display circuit, 34
...Starting operation detection circuit, 35...Oil level detection circuit,
36...gate circuit, 48...hold circuit, 5
0...Alarm display circuit, 52...Starting operation detection circuit, 56...Oil level detection circuit, 59, 60...Hold circuit.

Claims (1)

[Scope of utility model registration request] A starting operation detection circuit that detects the engine starting operation and issues a signal; an oil level detection circuit that detects the oil level in the oil pan and issues a signal when the oil level drops below a set position; and a starting operation detection signal. It is composed of a gate circuit that issues an activation signal when applied with an oil level detection signal, an alarm circuit that is activated by the activation signal of the gate circuit, and a hold circuit that maintains the alarm circuit in an activated state. ,
A lubricating oil amount alarm device for a motorcycle, etc., which responds only to an oil level detection signal applied together with a starting operation signal, and remains inactive in response to a detection signal based on a change in oil level during driving. .