JPH04274944A - Battery discharge prevention device when engine stops abnormally - Google Patents

Abstract

PURPOSE:To prevent discharge of a battery by automatically stopping electric equipment such as an electromagnetic pump for fuel supply which is provided in a load circuit of engine when an engine stops due to abnormal operation. CONSTITUTION:An on/off switch 5 of automatic reset type is provided in a key switch 2 and a load circuit 4, and an abnormality detection-timer circuit 6 is connected to the load circuit 4 in parallel. The circuit 6 consists of an abnormality detection operation switch 7, a relay 8 which is turned on or off by this switch 7, and a timer 10 which operates in conjunction with the on/off switch 5. Consequently, when an engine E stops due to abnormal operation, the on/off switch 7 is turned off after the time set by the timer 10 has elapsed based on the operation of the abnormality detection operation switch 7 to stop an electrical equipment 3 even if the key switch 2 remains on.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a device for preventing battery discharge when an engine stops abnormally. To provide something that can automatically stop equipment and prevent battery discharge.

0002

2. Description of the Related Art The basic structure of an electrical equipment for an engine, which is the object of the present invention, is as shown in FIG.
is connected to a load circuit 4 via a key switch 2, and when the key switch 2 is turned on, various electrical devices 3 arranged in the load circuit 4 are operated.

In this type of prior art, as shown in FIG. 3, electric equipment 3 such as an electromagnetic pump for fuel supply and a drive motor for a radiator cooling fan is connected to a load circuit 4 of a diesel engine E, and a key switch is connected to the load circuit 4 of the diesel engine E. Some devices are configured so that when the key switch 2 is turned on, the electrical equipment 3 is activated, and when the key switch 2 is turned off, the electrical equipment 3 is stopped. In addition to the oil pressure detector 12 facing the pressure-fed lubricating oil passage 11 of the diesel engine E, various abnormality detectors are also provided at predetermined locations outside the engine E, and the abnormality detector 12 is connected to the fuel injection pump. In conjunction with the stop solenoid 14 connected to the injection rack 13, when an abnormality occurs in the engine due to low oil pressure or fuel shortage, the abnormality detector 12 detects this abnormality and activates the stop solenoid via the abnormality detection activation switch 7. 14 is activated to stop the diesel engine E.

0004

[Problems to be Solved by the Invention] In the above-mentioned prior art, when the engine E stops due to abnormal operation, the key switch 2 remains on and the electromagnetic pump 3 etc. Since the battery continues to operate, there is a problem in that the battery 1 runs out due to continued discharging. A technical object of the present invention is to smoothly stop electrical equipment and prevent battery discharge even when a key switch is left in the on position when an engine stops abnormally.

[0005]

[Means for Solving the Problems] Means for achieving the above objects will be explained below with reference to drawings showing embodiments. That is, the present invention provides an engine having the basic structure described above, in which an automatic reset type on/off switch 5 is interposed between the key switch 2 and the load circuit 4, and an abnormality detection/off switch 5 is connected in parallel to the load circuit 4.
A timer circuit 6 is connected, and the abnormality detection/timer circuit 6 is connected to an abnormality detection activation switch 7, a relay 8 that is turned on and off by turning on and off the abnormality detection switch 7, and an on/off switch connected in series to the relay 8 and for the load circuit 4. The abnormality detector 12 facing the engine E is connected to the abnormality detection activation switch 7, and when the detected value of the abnormality detector 12 is out of the set range, the abnormality detection activation switch 7 is activated. 7
is activated, a timer 10 is activated via a relay 8, and after the set time of the timer 10, an on/off switch 5 of a load circuit 4 is turned off and the operation of the electrical equipment 3 is stopped. This is a battery discharging device in case of an abnormal stop.

[0006] The electrical equipment mentioned above refers to an electromagnetic pump for fuel supply, an electric motor for driving a radiator cooling fan, and the like. The above-mentioned abnormality detectors include an oil pressure detector that detects the oil pressure in the pressure-fed lubricating oil passage of the engine E, a water temperature detector that detects the water temperature of the water jacket, an exhaust temperature detector that detects the exhaust temperature in the exhaust passage, and an exhaust passage This refers to a smoke detector that detects smoke concentration.

[0007]

[Function] (1) When the engine E experiences an abnormality such as a drop in oil pressure, the key switch 2 is left in the on state.
Since the detected value of the abnormality detector is out of the set range (for example, in the case of an oil pressure detector, the detected oil pressure becomes less than the set oil pressure), the abnormality detection activation switch 7 is activated to energize the relay 8, and the timer is activated. 10 starts counting. and,
After the set time of the timer 10 has elapsed, the on/off switch 5 of the load circuit 4 is turned off, power is cut off from the battery 1, and the operation of the electrical equipment 3 is stopped.

(2) When the engine E is operated by turning on the key switch 2 after a normal stop, the electrical equipment 3 is activated and, on the other hand, the detected value of the abnormality detector 12 is still outside the set range. (For example, in the case of an oil pressure detector, the rotation speed of the engine E is low immediately after startup, and the detected oil pressure has not reached the set oil pressure.) As expected, the abnormality detection activation switch 7 is activated and the relay 8 is activated. The power is turned on and the timer 10 starts counting. However, as the rotational speed of the engine E increases, the detection value of the abnormality detector 12 falls within the set range, so at that point the count of the timer 10 is stopped and the on/off switch 5 of the load circuit 4 is turned off. The electrical equipment 3 continues to operate smoothly. On the other hand, when the engine E is operated after the abnormal stop described in (1) above, the once turned off on/off switch 5 automatically returns to energize the load circuit 4, so the electrical equipment 3 operates without any trouble.

[0009]

Effects of the Invention (1) When an abnormality occurs in the engine such as a drop in oil pressure, the on/off switch of the load circuit is turned off after the time set by the timer to cut off the power supply from the battery. Since it stops operating, it is possible to reliably prevent the battery from discharging. (2) A timer is interposed between the abnormality detection activation switch and the on/off switch of the load circuit, so that there is a time leeway in which the on/off switch is turned off after the time set on the timer has elapsed from the time the abnormality was detected. Therefore, when starting the engine, even if the abnormality detection activation switch is activated, the on/off switch is not disconnected, so there is no problem with the operation of the electrical equipment. (3) If the electrical equipment is an electromagnetic pump for fuel supply, for example, and the engine stops due to an abnormality such as running out of fuel, the electromagnetic pump will stop smoothly even if the key switch is left on, so the pump will be damaged due to dry running. There's nothing to do.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a schematic explanatory diagram of a battery discharge prevention device when a vertical diesel engine stops abnormally, and FIG. 2 is a time chart of the engine, electromagnetic pump, etc.

As shown in FIG. 1, a vertical diesel engine E is provided with a fuel injection pump 13, a stop solenoid 14 is attached to the injection rack of the pump 13, and an oil pressure detector is installed in the pressure-feed lubricating oil passage 11 of the engine E. 12 is coming. Connect battery 1 to key switch 2 of engine E,
Preheating glow circuit 16 to glow position 15 of key switch 2
, the load circuit 4 is connected to its operating position 17, and the cell starter circuit 19 is connected to its starting position 18.The electromagnetic pump 3 for fuel supply is arranged in the load circuit 4, and the key switch 2 is operated (on). ) When the key switch 2 is switched to position 17, the electromagnetic pump 3 of the load circuit 4 is activated, and when the key switch 2 is switched to the stop (off) position 20, the electromagnetic pump 3 is stopped.

An automatic return type normally closed switch 5 is interposed between the key switch 2 and the load circuit 4, and an oil pressure detection/timer circuit 6 is connected in parallel to the load circuit 4 to detect the oil pressure.
The timer circuit 6 is composed of an oil pressure detection activation switch 7, a relay 8 that is turned on and off when the oil pressure detection switch 7 is turned on and off, and a timer 10 that is connected in series with the relay 8 and linked to the normally closed switch 5 of the load circuit 4. Ru. The oil pressure detector 12
is linked to the oil pressure detection activation switch 7, and the oil pressure detection activation switch 7 is connected to the stop solenoid 14 of the fuel injection pump 13.
linked to.

The functions of this battery discharge prevention device will now be explained with reference to FIG. (1) When an abnormality occurs in the engine E such as a drop in oil pressure, the oil pressure detected by the oil pressure detector 12 drops below the set oil pressure, so the oil pressure detection activation switch 7 is activated and the stop solenoid 14 is activated to stop the fuel injection pump 13. Push the injection rack to the no-injection position to stop engine E. In this case, the key switch 2 is left in the on position 17 as shown in FIG.
With the operation of the oil pressure detection activation switch 7, the relay 8 of the oil pressure detection/timer circuit 6 is energized, and the timer 10 starts counting. Then, after a set time T of the timer 10, the normally closed switch 5 of the load circuit 4 opens, cutting off the power supply from the battery 1 and stopping the electromagnetic pump 3. Therefore, even if the key switch 2 remains on, discharging of the battery 1 is reliably prevented.

(2) When the engine E is operated by turning the key switch 2 to the ON position 17 after a normal stop, the electromagnetic pump 3 starts operating, but on the other hand, the rotation speed of the engine E is still low immediately after starting. Because the oil pressure is low, the oil pressure detected by the oil pressure detector 12 does not reach the set oil pressure, so the oil pressure detection activation switch 7 is activated, the relay 8 is energized, and the timer 10 also starts counting. However, as the rotational speed of the engine E increases, the oil pressure detected by the oil pressure detector 12 exceeds the set oil pressure, so at that point the timer 10 stops counting and the normally closed switch 5 of the load circuit 4 opens. Therefore, the electromagnetic pump 3 continues to operate smoothly. On the other hand, (1) above
When the engine E is operated after an abnormal stop, the normally-closed switch 5, which has been opened once, automatically returns and energizes the load circuit 4, so that there is no problem in the operation of the electromagnetic pump 3.

In the present invention, since the abnormality detection activation switch of the engine E is used to prevent the battery 1 from being discharged, the combination of the oil pressure detector 12 and the oil pressure detection activation switch 7 of the above embodiment may be used, for example, as shown in FIG. As shown by the imaginary line, an exhaust gas temperature detector 12a facing the exhaust pipe 21 and an exhaust gas temperature detection activation switch 7a may be used instead. Moreover, the present invention
The present invention can also be applied to the case where the load circuit 4 includes electrical equipment other than the electromagnetic pump, such as an electric motor for driving a radiator cooling fan.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a battery discharge prevention device when a vertical diesel engine stops abnormally.

FIG. 2 is a time chart of the engine, electromagnetic pump, etc.

FIG. 3 is a diagram corresponding to FIG. 1 showing the prior art;

[Explanation of symbols] 1 Battery 2 Key switch 3 Electrical equipment 4 Load circuit 5 Automatic return type on/off switch 6 Abnormality detection/timer circuit 7 Abnormality detection activation switch 8 Relay 10 Timer 12 Engine abnormality detector E engine

Claims (1)

[Claims] [Claim 1] The battery (1) is connected to the key switch (2).
Connect to the load circuit (4) through the key switch (2)
In an engine configured to operate various electrical equipment (3) placed in the load circuit (4) when the key switch (2) and the load circuit (4) are turned on, an automatic reset type on/off switch is installed in the key switch (2) and the load circuit (4). (5), and an abnormality detection/timer circuit (6) is connected in parallel to the load circuit (4), and the abnormality detection/timer circuit (6) is connected to the abnormality detection activation switch (7).
), a relay (8) that is turned on and off when the abnormality detection switch (7) is turned on and off, and a timer (
10), the abnormality detector (12) facing the engine (E) is linked to the abnormality detection activation switch (7), and when the detected value of the abnormality detector (12) is out of the set range, The abnormality detection activation switch (7) is activated and the relay (8) is activated.
The timer (10) is activated via the timer (10), and after the set time of the timer (10), the on/off switch (5) of the load circuit (4) is turned off and the operation of the electrical equipment (3) is stopped. Features: Battery discharging device when the engine stops abnormally.