JPS6320842Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a stopping device for a diesel engine. Conventionally, diesel engines, unlike gasoline engines, cannot be stopped even if the main key switch is disconnected as long as the fuel supply system is connected; instead, diesel engines must be manually operated using the control rack of the fuel injection pump or the dedicated stop lever. Since the engine is configured to be stopped by cutting off the fuel supply, there is a problem in that the operation when stopping the engine becomes complicated. The present invention solves the above-mentioned problem, and is directly engaged with the injection amount adjusting means that adjusts the fuel injection amount of the fuel injection pump, and when electricity is applied, the injection amount adjusting means is activated to put the fuel injection pump in a non-injection state. an actuator for activating the fuel injection pump, an energizing means for energizing the injection amount adjusting means so that the fuel injection pump is ready for fuel injection, an on terminal disposed so as to be able to contact a movable terminal connected to a power source, and a starter terminal; and a key switch having an OFF terminal, a hydraulic switch that detects the pressure of lubricating oil of the engine and is opened when the pressure falls below a predetermined value and has one end connected to a power source, and a terminal A connected to an ON terminal of the key switch.
A terminal B connected to the other end of the hydraulic switch and the starter terminal, and potential difference detection means for detecting a potential difference between the terminals A and B; a timer circuit that operates for a predetermined time when the means detects a potential difference; The controller includes a transistor that is turned on by the operation of a circuit and supplies power to the actuator, and when the key switch is turned on from on to off, when the key switch is turned from off to on, and during operation, The gist of the present invention is a diesel engine stopping device, characterized in that the actuator is configured to operate when a switch is opened. An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3. Reference numeral 10 generally indicates a diesel engine body, and a cylinder block 12 thereof is equipped with a conventionally well-known fuel injection pump 14. The fuel injection pump 14 is provided with a control rack 16 which is an injection amount adjusting means for adjusting the fuel injection amount by sliding left and right in FIG. 18 is fixed to the pin 18, and the control rack 16 is slid by manually operating a control lever (not shown) which normally engages with the pin 18. The pin 18 also has a stopper which is pivotally supported on the fuel injection pump 14 main body so as to be rotatable clockwise from the position shown in FIG. 2, and which is biased counterclockwise by a spring (not shown). The position of the control rack 16 where the pin 18 comes into contact with the stopper 20 (the position shown in the figure) is the normal operating position, and the control rack 16 is moved from the same position to the right in the figure by the lever. When the control rack 16 is moved to the normal operating position, the engine is gradually decelerated and the fuel supply to the engine is cut off at the right end position (stop position). By sliding it to the left in the figure, a particularly large amount of fuel can be supplied for starting. An electromagnetic actuator 22 is mounted on the wall of the cylinder block 12, which is an extension of the control rack 16, and when the actuator 22 is energized, a plunger 24 protrudes and presses and slides the control rack 16 to the above-mentioned stop position.
When demagnetized, the plunger 24 is retracted by the urging force of an urging means such as a spring (not shown). Next, the controller 26 that operates the actuator 22 will be explained. 28 is a key switch, which has a glow plug terminal 30, an OFF terminal 32, an ON terminal 34, and an ST terminal 36, and is connected to a power source 38, and has a movable contact 40 selectively connected to each of the terminals. A terminal 42 is provided. A glow plug 44 provided in the combustion chamber of the engine is connected to the glow plug terminal 30, and the on terminal 34 is connected to various electrical accessories such as a radio, a heater fan, a lighting device, and a charge lamp of the engine. machine 46 is connected,
A starter motor 48 of the engine is connected to the starter terminal 36. The controller 26 is connected to the power source 38 via a terminal A connected to the ON terminal of the key switch 28 and a hydraulic switch 50 that opens when the engine oil pressure is below a predetermined value and closes when it is above a predetermined value. terminal B connected to the starter terminal, terminal D connected directly to the power supply 38, terminal E connected to the electromagnetic coil 52 of the actuator 22.
and F, and a terminal G which is grounded via an alarm device 54 such as an alarm buzzer or lamp. 56 is a diode bridge circuit forming a potential difference detection circuit;
R1 to R10 are resistors, C1 and C2 are capacitors, D1 to D3 are diodes, and Tr1 to Tr3 are transistors. The above terminal C is diode D3
The terminal B is connected to the terminal B through the terminal C, and the current is supplied only from the terminal C to the terminal B direction. The diode bridge circuit 56 supplies current to the transistor Tr1 when voltage is supplied to only one of the terminals A or B, and the amplified current is further amplified via the transistors Tr2 and Tr3, and the amplified current is further amplified via the transistors Tr2 and Tr3, and the amplified current is further amplified through the transistors Tr2 and Tr3. The signal is supplied to an electromagnetic coil 52 connected therebetween and an alarm device 54 provided at a terminal G.
At this time, a timer circuit is formed by transistors Tr1 and Tr2 and a capacitor C2 provided between both transistors Tr1 and Tr2 so that current is supplied to transistor Tr1 only for a predetermined period of time, for example, 10 seconds. , the controller 26 energizes the electromagnetic coil 52 and activates the alarm device 54 in accordance with the time period. The operation of this embodiment with the above configuration will be explained below based on the actuator operation list.

[Table] As shown in Fig. 3, from the engine stopped state with the contact 40 of the key switch 28 held at the OFF terminal 32 position, the glow plug is connected to the glow plug terminal 30 to heat it, and then turned in the direction of the ON terminal 34. After it is connected to the ON terminal 34 for a moment, it is further connected to the starter terminal 36 to operate the starter motor 48 and crank the engine. At this time, since the power supply voltage is supplied to terminal A from the ON terminal 34 and the power supply voltage is not supplied to terminal B, a potential difference occurs between terminals A and B, and at that moment, the solenoid 52 is energized and the actuator 22 actuates the control rack to the non-injector. Next, the contact 40 is connected to both the on terminal 34 and the starter terminal 36, and the controller 2
The power supply voltage is supplied to the terminal A of 6, and the power supply voltage is not directly supplied to the terminal B since the hydraulic switch 50 is opened. However, the power supply voltage is supplied to the terminal B via the starter terminal 36, the terminal C, and the diode D3. For this reason, the solenoid 52 is de-energized. When the cranking described above is started, the oil pressure by the oil pump (not shown) reaches a predetermined value, for example 0.3.
Kg/cm ² or more, the hydraulic switch 50 is closed and the voltage of the power source 38 is supplied to the terminal B. When the engine is started by cranking, the contact 40 of the key switch 28 is turned on to the ON terminal 3.
By connecting to 4, the normal operating state is established. In the above operating state, since the voltage of the power supply 38 is supplied to the terminals A and B, the diode bridge circuit 56 of the controller 26 has no potential difference between the terminals A and B, so the transistor
Since no current is supplied to Tr1 and the electromagnetic coil 52 is not excited, the actuator 22 does not stop the engine. Next, when the engine is in operation, the control rack 16 is controlled by a control lever, governor device, etc. (not shown) to control the engine output.
Control the rotation speed. When the contact 40 of the key switch 28 is rotated from the ON terminal 34 toward the OFF terminal 32, the terminal A and the power source 38 are cut off, and the terminal B is connected to the hydraulic switch 5.
0, the diode bridge circuit 56 supplies current to the transistor Tr1 by the potential difference between terminals A and B, and the current amplified by the transistors Tr2 and Tr3. Supplied to the electromagnetic coil 52 and actuator 22
to move the control rack 16 to the stop position and stop the engine. When the engine is stopped, the hydraulic switch 50 is also opened, the supply of current to both terminals A and B is stopped, and the energization to the electromagnetic coil 52 is also stopped. Furthermore, even when the engine is running with the contact 40 of the key switch 28 held at the ON terminal 34 position, oil leakage may occur.
When the oil pressure drops abnormally due to a failure of the oil pump or the like, the oil pressure switch 50 is opened and a potential difference is created between terminals A and B to excite the electromagnetic coil 52 and stop the engine. The electromagnetic coil 52
The time for energizing is controlled by a timer circuit formed by a capacitor C2 provided between transistors Tr1 and Tr2, and after the time for completing charging of the capacitor C2, for example, 10 seconds, has elapsed, Since the current to the transistor Tr2 is cut off, the power to the electromagnetic coil 52 is stopped, and the power supply 3
8. Prevent power consumption. In the above-mentioned operation, an alarm device 54 is provided at the terminal G, and is activated at the same time as the electromagnetic coil 52 is energized to notify the driver etc. of the operation of the actuator 52. Regardless of the above operation, contact 4 of key switch 28
0 is held at the ON terminal 34 position and there is no abnormal oil pressure drop, normal operation continues and the actuator 22 is held without stopping the engine. 16 to the stop position and the engine stops, or when the engine stops due to excessive load, the oil pressure switch 50 is opened due to a drop in oil pressure, and the potential difference between terminals A and B causes the oil pressure switch 50 to open. Then, the electromagnetic coil 52 is energized,
Also, the alarm device 54 is activated. Therefore, the operation of the alarm device 54 allows the driver to know that the contact 40 of the key switch 28 is connected to the ON terminal 34 and that the electrical auxiliary equipment 46 continues to be energized. Since it is possible, key switch 2
By turning off the power source 8, power consumption of the power source 38 can be prevented. As described above, according to this embodiment, when the key switch 28 is turned off, the actuator 22 having the electromagnetic coil 52 is operated, and the engine control rack 16 is operated to the stop position.
The engine can be stopped reliably with a simple operation, and since the energization to the electromagnetic coil 52 is blocked when the engine is stopped, the electric power cost of the power source 38 and the heating of the electromagnetic coil 52 are effectively prevented. be effective. Further, according to this embodiment, even when the oil pressure of the engine decreases, the actuator 22 is actuated by the operation of the oil pressure switch 50 to stop the engine, so the engine continues to be operated after the oil pressure decreases, causing seizure. Effectively prevent fear. Further, according to this embodiment, when the key switch is turned from the OFF contact to the ON contact when starting the engine, a potential difference is generated between the terminals A and B, and the actuator is always turned off once by the controller 26. Set to injection state. Therefore, even if the engine is stopped in an abnormal state and the injection amount adjustment means is stopped in the injection state, the injection amount adjustment means is set to the non-injection state when the engine is started, so that the engine can be restarted by normal starting operation. Effectively prevents overruns, the generation of large amounts of black smoke, and the release of unpurified exhaust gas. Furthermore, when the engine is stopped, or when the engine is stopped by operating the control rack 16 with a control lever or the like, the key switch 28 is held in the on position, resulting in power consumption; however, according to this embodiment, the actuator 22 is When activated, the alarm device 54 is activated to notify the driver that it is necessary to turn off the key switch 28,
This has the effect of effectively preventing power consumption. In the above embodiment, only the hydraulic switch 50 is provided between the terminal B and the power source 38, but the hydraulic switch 50 is a temperature responsive switch that responds to the cooling water temperature.
is installed in series with the cooling water, and is closed when the cooling water temperature is normal.
By configuring the system to open when the cooling water temperature reaches a predetermined value, for example, 120° C. or higher, the engine can be automatically stopped when the engine overheats, thereby effectively preventing engine seizure.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of an engine to which an embodiment of the present invention is applied, Figure 2 is an explanatory diagram of an injection pump section according to an embodiment of the present invention, and Figure 3 is an explanatory diagram of a circuit according to an embodiment of the present invention. be. 10... Diesel engine, 14... Fuel injection pump, 16... Control rack, 22...
...Actuator, 26...Controller, 28
...Key switch, 32...Off terminal, 34...
ON terminal, 50...hydraulic switch, 52...electromagnetic coil.

Claims (1)

[Scope of utility model registration request] an actuator that directly engages with an injection amount adjustment means that adjusts the fuel injection amount of the fuel injection pump and activates the injection amount adjustment means when energized to place the fuel injection pump in a non-injection state; the fuel injection pump is capable of injecting fuel; energizing means for energizing the injection amount adjusting means so that the injection amount adjusting means is in the state; an on terminal disposed so as to be able to contact a movable terminal connected to a power source; a starter terminal;
and a key switch having an OFF terminal, a hydraulic switch that detects the pressure of lubricating oil in the engine and is opened when the pressure becomes less than a predetermined value and has one end connected to a power source, and a terminal A connected to an ON terminal of the key switch, and the above-mentioned Terminal B connected to the other end of the hydraulic switch and the starter terminal, and terminal A,
The controller includes a potential difference detection means for detecting a potential difference between B and B, a timer circuit that operates for a predetermined time when the means detects a potential difference, and a transistor that is turned on by the operation of the timer circuit and supplies power to the actuator, The actuator is configured to be actuated when the key switch is actuated from on to off, when the key switch is actuated from off to on, and when the hydraulic switch is opened during operation. Diesel engine stopping device.