JP2004116473A - Engine control device for fire engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine control device for a fire engine capable of decreasing a cost of components comprising the engine control device, saving space by downsizing the engine control device, and facilitating inspection of a fire pump. <P>SOLUTION: In an ascending circuit 55A and a descending circuit 55B, an automatic pressure controlling/flow rate signal is inputted. The ascending circuit 55A and the descending circuit 55B output an ascending signal and the descending signal to a digital potentiometer 63 so as to make water pressure and flow rate discharged from a fire pump 3 agree with water pressure and flow rate on the basis of an established pressure signal and an established flow rate signal. The digital potentiometer 63 changes output resistance thereof according to the inputted ascending signal and the descending signal, and on the basis of that, the engine speed of an engine 1 is increased/decreased. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine control device of a fire engine, and in particular, can reduce the size of the engine control device to save space and facilitate inspection of a fire pump while reducing the cost of parts constituting the engine control device. The present invention relates to an engine control device for a fire engine.
[0002]
[Prior art]
Generally, water discharge control in a fire engine is performed by controlling the engine speed.
FIG. 2 shows a simplified configuration diagram of the control device for the engine speed.
[0003]
In FIG. 2, the engine 1 rotationally drives a fire pump 3 via a rotary shaft (not shown). A suction pipe 5A is connected to an inlet 3a, which is one end of the fire pump 3, to absorb water from a suction port (not shown). An outlet 3b, which is the other end of the fire pump 3, is connected to a discharge pipe 5B to discharge water from a discharge port (not shown).
[0004]
Further, a vacuum pump 7 is connected to the inlet 3 a side of the fire pump 3 via a pipe 6. The vacuum pump 7 is an oilless pump such as a vane pump or the like, and is driven to rotate from a rotation shaft of the engine 1 via a clutch 9. Further, the vacuum pump 7 operates at the time of water pumping operation before starting water discharge, and guides priming water into the fire pump 3 by evacuating the inside of the fire pump 3 and the suction pipe 5A. It has become.
[0005]
A pressure sensor 11 is connected to the fire pump 3, the suction pipe 5A, and the discharge pipe 5B. The pressure sensor 11 detects the water pressure of the fire pump 3, the suction pipe 5A, and the discharge pipe 5B. The detection result is output to an automatic pressure regulation / flow rate comparison circuit 23, which will be described later, and the pumping operation and the water discharging operation are performed. It is used for automatic control in the case of.
[0006]
A pressure switch 15 is connected to the pressure sensor 11. The pressure switch 15 is a switch that outputs a notification when the water pressure inside the fire pump 3 or the suction pipe 5A reaches a set value during the pumping operation. The signal is output to the circuit 25.
[0007]
Further, a flow rate sensor 13 is connected to the suction pipe 5A and the discharge pipe 5B.
The flow rate sensor 13 detects the flow rate of water in the suction pipe 5A and the discharge pipe 5B, and this detection result is also output to the automatic pressure regulation / flow rate comparison circuit 23 to perform automatic control such as at the time of water discharge operation. It has been used for.
[0008]
The automatic control device 21 includes an automatic pressure / flow rate comparison circuit 23 and a pumping determination circuit 25.
The automatic pressure regulation / flow rate comparison circuit 23 receives the detection signals from the pressure sensor 11 and the flow rate sensor 13 as described above, and also receives a set pressure signal and a set flow rate signal serving as a reference thereof. The automatic pressure regulation / flow rate comparison circuit 23 supplies the actual water pressure and water amount detected by the pressure sensor 11 and the flow rate sensor 13 and the water pressure and water amount based on the set pressure signal and the set flow rate signal at the time of the water discharge operation or the like. Is output to the motor 33 as an automatic pressure regulation / flow rate signal. The set value signal and the set flow rate signal are changed by pressing a switch (not shown) when a fireman wants to change the water pressure or the water amount at the time of a water discharge operation or the like. .
[0009]
Then, the motor 33 receives the automatic pressure regulation / flow rate signal from the automatic pressure regulation / flow rate comparison circuit 23, and adjusts the water pressure or the amount of water discharged from the fire pump 3 based on the set pressure signal or the set flow rate signal. The number of rotations of the motor 33 itself is controlled so as to be equal to the amount of water and the amount of water. The motor 33 mechanically moves a lever 41, which will be described later, in accordance with the rotation speed.
[0010]
On the other hand, the pumping determination circuit 25 receives the output signal of the pressure switch 15 and the pumping start signal as described above. This pumping start signal is a signal that is input when a fireman presses a switch (not shown) or the like when starting a pumping operation.
[0011]
Then, the pumping determination circuit 25 receives the pumping start signal, connects the clutch 9 to the vacuum pump 7, receives the output signal from the pressure switch 15, and disconnects the clutch 9 from the vacuum pump 7. Has become. The connection / disconnection signal between the vacuum pump 7 and the clutch 9 is output to the solenoid 35 as an automatic pumping signal.
[0012]
When the solenoid 35 receives the automatic pumping signal from the pumping discrimination circuit 25, it supplies a current to itself and generates a (preset) magnetic field, and the lever 41 is mechanically moved by the magnetic force. It has become.
[0013]
In the control of the lever 41, simple manual control may be performed in addition to the automatic control via the motor 33 and the solenoid 35 from the automatic control device 21.
Therefore, a throttle handle 31 is provided on each side of the body of the fire engine (not shown), and the lever 41 can be directly moved by moving the throttle handle 31.
[0014]
In addition to the case where the throttle handle 31 is directly connected to the lever 41, the operation of the throttle handle 31 may be received by a motor or the like (not shown), and the lever 41 may be moved accordingly.
[0015]
The lever 41 is connected to a potentiometer 43. The position of the slider 43a of the potentiometer 43 changes according to the position of the lever 41. The output resistance of the potentiometer 43 is variable according to the position of the slider 43a.
[0016]
The output resistance of the potentiometer 43 is converted into a voltage and detected by the engine control computer 45, and the engine control computer 45 increases or decreases the rotation speed of the engine 1 according to the output resistance of the potentiometer 43.
[0017]
In such a configuration, when the fire engine performs a water pumping operation, the engine 1 is started and the fire pump 3 is driven. At this time, the fireman presses a switch (not shown) to start the pumping operation, and a pumping start signal is input to the pumping determination circuit 25. In the pumping determination circuit 25, the vacuum pump 7 and the clutch 9 are connected based on the pumping start signal.
[0018]
Further, a signal (automatic pumping signal) indicating that the vacuum pump 7 and the clutch 9 are connected is output from the pumping determination circuit 25 to the solenoid 35, and the solenoid 35 moves the lever 41 by the magnetic force generated in the solenoid 35 itself. Thereby, the slider 43a of the potentiometer 43 is moved, and the engine 1 increases the rotation speed. Then, the fire pump 3 and the vacuum pump 7 suction water at a rotation speed necessary for pumping water.
[0019]
Thereafter, when the pumping operation is nearing completion, the pressure switch 15 outputs a signal indicating that the water pressure in the fire pump 3 has reached the set value. Upon receiving this output signal, the pumping determination circuit 25 disconnects the vacuum pump 7 and the clutch 9 and stops the vacuum pump 7 to terminate the pumping operation.
[0020]
Next, when performing the water discharge operation, the pressure sensor 11 detects the pressure of the water discharged from the fire pump 3. At the same time, the flow rate of water is detected by the flow rate sensor 13.
[0021]
Then, the automatic pressure regulation / flow rate comparison circuit 23 controls the number of revolutions of the motor 33 so that the water pressure and the water amount discharged from the fire pump 3 match the set pressure signal and the set flow rate signal. Then, the motor 33 moves the lever 41 under the control of the automatic pressure / flow rate comparison circuit 23.
[0022]
The lever 41 moves the slider 43 a of the potentiometer 43 by the power of the motor 33 to change the output resistance of the potentiometer 43. Then, the engine control computer 45 having received the change in the output resistance of the potentiometer 43 changes the rotation speed of the engine 1 under the control thereof, and changes the water pressure and the amount of water discharged from the fire pump 3.
[0023]
Further, the control of the lever 41 can be manually performed using the throttle handle 31 as described above.
[0024]
At the time of manual pumping operation, for example, the vacuum pump 7 and the clutch 9 are connected manually (or automatically as described above). Then, the fireman increases the rotation speed of the engine 1 while moving the throttle handle 31 while checking the pressure in the fire pump 3 detected by the pressure sensor 11.
[0025]
Then, the throttle handle 31 is operated until the water pressure in the fire pump 3 reaches the set value. When the water pressure reaches the set value, the vacuum pump 7 and the clutch 9 are manually (or automatically, similarly to the above) disconnected. Then, the pumping operation ends. Thereafter, during the water discharging operation, the throttle handle 31 is controlled so as to maintain the required water pressure and water amount during the water discharging operation while checking the water pressure and the water amount detected by the pressure sensor 11 and the flow rate sensor 13.
In this way, during the pumping operation and the water discharging operation, the rotation speed of the engine 1 is controlled to adjust the water pressure and the water amount of the fire pump 3, the suction pipe 5A, and the discharge pipe 5B.
[0026]
[Problems to be solved by the invention]
Incidentally, such a control device for the rotation speed of the engine 1 is mechanically configured using a link mechanism that is linked to the throttle handle 31, the motor 33, the solenoid 35, and the like.
[0027]
However, in the case of such a mechanical configuration, since the throttle handle 31, the motor 33, the solenoid 35, and the like are required, the number of components constituting the control device increases, and the cost may be increased. . In addition, many steps are required in the process of manufacturing these components, and the manufacturing time may be prolonged.
[0028]
Further, such a link mechanism is often disposed near the fire pump 3 because it requires a large space in structure, and in such a case, it may take time to inspect the fire pump 3. there were.
Further, depending on the configuration of the link mechanism, it is assumed that the link mechanism itself does not operate normally due to insufficient power when the lever 41 is moved by the motor 33 (so-called insufficient torque). There was a risk that optimization would be difficult.
[0029]
The present invention has been made in view of such a conventional problem, and reduces the cost of parts constituting an engine control device, reduces the size of the engine control device to save space, and facilitates inspection of a fire pump. It is an object of the present invention to provide a fire engine control device for a fire engine.
[0030]
[Means for Solving the Problems]
Therefore, the present invention provides an engine mounted on a fire engine, a pump that sucks water and discharges water according to the rotation speed of the engine, the inside of the pump, the water sucked by the pump, and the pump. Pressure detection means for detecting at least one pressure of the water discharged from the water, pressure comparison means for comparing the water pressure detected by the pressure detection means with a reference water pressure, and pressure comparison means for comparing A rise / fall circuit that outputs a signal for raising / lowering the rotation speed of the engine based on the result; and a rotation speed setting unit that sets the rotation speed of the engine based on a signal output from the rise / fall circuit. Wherein the rotation speed of the engine is controlled such that the water pressure detected by the pressure detection means matches the reference water pressure.
[0031]
The water pressure discharged from the pump or the like is detected by the pressure detecting means. Then, the pressure comparison means compares the water pressure discharged from the pump with a reference water pressure. The result of this comparison is output to the up / down circuit, and the up / down circuit outputs a signal for increasing or decreasing the engine speed to the engine speed setting means. Then, the rotation speed setting means sets the rotation speed of the engine based on the signal output from the raising / lowering circuit.
This makes it possible to electrically control the engine speed automatically. Therefore, it is possible to reduce the cost of parts constituting the engine control device, reduce the size of the engine control device to save space, and to facilitate inspection of the pump.
[0032]
Also, the present invention provides an engine mounted on a fire engine, a pump that sucks water and discharges water according to the number of revolutions of the engine, and water that is drawn into the pump and / or discharged from the pump. Flow rate detecting means for detecting the flow rate of the water flowing through the engine, flow rate comparing means for comparing the flow rate of the water detected by the flow rate detecting means with a reference flow rate, and the engine based on a result compared by the flow rate comparing means. A rise / fall circuit that outputs a signal for raising / lowering the rotation speed of the engine, and rotation speed setting means for setting the rotation speed of the engine based on the signal output from the rise / fall circuit. The number of revolutions is controlled such that the flow rate of water detected by the flow rate detection means matches the reference flow rate.
[0033]
The flow rate of the water discharged from the pump or the like is detected by the flow rate detecting means. Then, the flow rate comparing means compares the flow rate of the water discharged from the pump with a reference flow rate. The result of this comparison is output to the up / down circuit, and the up / down circuit outputs a signal for increasing or decreasing the engine speed to the engine speed setting means. Then, the rotation speed setting means sets the rotation speed of the engine based on the signal output from the raising / lowering circuit.
Thus, the engine speed can be electrically controlled even in the automatic control of the flow rate of water.
[0034]
Further, the present invention provides an engine mounted on a fire engine, a pump that sucks water and discharges water according to the rotation speed of the engine, the inside of the pump, the water sucked by the pump, and the pump. Pressure detection means for detecting at least one pressure of water discharged from the pump, flow rate detection means for detecting a flow rate of water sucked into the pump and / or water discharged from the pump, and the pressure detection Pressure comparison means for comparing the water pressure detected by the means with a reference water pressure, flow rate comparison means for comparing the flow rate of water detected by the flow rate detection means with a reference flow rate, the pressure comparison means and the flow rate An ascending / descending circuit for outputting a signal for increasing or decreasing the rotational speed of the engine based on a result of comparison by the comparing means; and a circuit for rotating the engine based on a signal output from the ascending / descending circuit. Number of rotations setting means for setting the number of rotations of the engine, the rotation speed of the engine, the water pressure detected by the pressure detection means coincides with the reference water pressure, and the flow rate of water detected by the flow rate detection means The flow rate is controlled so as to coincide with the reference flow rate.
[0035]
As a result, it is possible to electrically control the engine speed based on the water pressure and the flow rate.
[0036]
Further, the present invention provides an engine mounted on a fire engine, a pump that sucks water and discharges water according to the rotation speed of the engine, and a pump that is connected to the pump and evacuates the inside of the pump. A vacuum pump driven during operation, pressure detection means for detecting the pressure of at least one of the inside of the pump, the water sucked into the pump and the water discharged from the pump, and a pumping start command. The pumping operation is started when inputted, and the pumping determination means for ending the pumping operation when the water pressure detected by the pressure detecting means exceeds a reference water pressure, and a period from the start to the end. A pumping control circuit that outputs a pumping control signal to the pumping circuit; and a raising and lowering circuit that outputs a signal for raising and lowering the engine speed based on the pumping control signal output from the pumping control circuit. And a circuit, based on a signal output from the raising and lowering circuit was constructed and a rotational speed setting means for setting a revolution speed of the engine.
[0037]
When the fire engine performs a pumping operation, a pumping start command is input to the pumping determination means. Then, the pumping determination means drives the vacuum pump to evacuate the inside of the pump. Further, the pumping control circuit outputs a pumping control signal to the up / down circuit. Further, the up / down circuit outputs a signal for increasing / decreasing the engine speed to the engine speed setting means. Then, the rotation speed setting means sets the rotation speed of the engine based on the signal output from the raising / lowering circuit. When the water pressure inside the pump reaches the reference water pressure, the pumping operation is terminated by the pumping determination means.
As a result, the engine speed can be controlled electrically even in the automatic control during the pumping operation.
[0038]
Further, the present invention provides an engine mounted on a fire engine, a pump for sucking water and discharging water according to the rotation speed of the engine, a setting means capable of setting the rotation speed of the engine, An up / down circuit for outputting a signal for increasing / decreasing the engine speed based on the setting in the means; and a speed setting for setting the engine speed based on a signal output from the up / down circuit. And means.
[0039]
During the pumping operation, the setting means sets the engine speed. Also, at the time of the water discharging operation, the setting means sets the number of revolutions of the engine so as to maintain the required water pressure and water amount. The ascending / descending circuit outputs a signal for increasing or decreasing the engine speed to the engine speed setting device based on the setting by the setting device. Then, the rotation speed setting means sets the rotation speed of the engine based on the signal output from the raising / lowering circuit.
Thus, the engine speed can be controlled electrically even in the manual control during the pumping operation or the water discharging operation.
[0040]
Further, the present invention is characterized in that the signal output from the raising / lowering circuit is a pulse signal, and the output resistance of the rotation speed setting means is changed according to the pulse signal.
[0041]
As a result, electrical components can be used as the rotation speed setting means. Conventionally, the output resistance changes in many cases, but the rotation speed setting means has a specification in which the output resistance changes, so that the existing equipment can be used and applied as it is. it can.
[0042]
Further, the present invention is characterized in that the lifting / lowering circuit and / or the pumping control circuit is formed on a substrate.
[0043]
As a result, it is possible to save space in the up-down circuit and the pumping control circuit.
[0044]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows a simplified configuration diagram of an engine speed control device according to an embodiment of the present invention. The same elements as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.
[0045]
In FIG. 1, the CPU 51 is provided in the control device for controlling the number of revolutions of the engine 1 instead of the conventional throttle handle 31, motor 33, solenoid 35 and the like, and a link mechanism linked thereto. The CPU 51 includes a pumping control circuit 53, an ascending circuit 55A, and a descending circuit 55B.
[0046]
An automatic pumping signal, which is an output of the pumping determination circuit 25, is input to the pumping control circuit 53. The pumping control circuit 53 uses a preset electric signal as a pumping control signal based on the automatic pumping signal to adjust the engine 1 to the set rotation speed during the pumping operation, and uses the ascending circuit 55A and the descending circuit 55B. Output. The pumping control signal is divided into a signal for increasing the number of revolutions of the engine 1 and a signal for decreasing the same, and is output to the ascending circuit 55A and the descending circuit 55B, respectively.
[0047]
Then, the ascending circuit 55A and the descending circuit 55B output an ascending signal and a descending signal to the digital potentiometer 63 based on the inputted pumping control signal so as to match the rotation speed of the engine 1 required for the pumping operation. It has become.
[0048]
The automatic pressure regulation / flow rate signal output from the automatic pressure regulation / flow rate comparison circuit 23 is input to the ascending circuit 55A and the descending circuit 55B. The automatic pressure regulation / flow rate signal is output separately from a signal for increasing the number of revolutions of the engine 1 and a signal for decreasing the same, unlike the conventional one, and is output to the ascending circuit 55A and the descending circuit 55B, respectively. Has been entered.
[0049]
Then, the ascending circuit 55A and the descending circuit 55B are controlled based on the input automatic pressure / flow rate signal so that the actual water pressure or the water amount matches the water pressure or the water amount based on the set pressure signal or the set flow rate signal. An ascending signal or a descending signal is output to the digital potentiometer 63.
[0050]
Further, operation signals from an operation panel 57 attached to both sides of the body of the fire engine (not shown) are input to the ascending circuit 55A and the descending circuit 55B.
By pressing the UP button 57a or the DOWN button 57b of the operation panel 57, the firefighter manually operates the ascending circuit 55A and the descending circuit 55B instead of the automatic control via the pumping control circuit 53 and the automatic pressure / flow rate comparing circuit 23. Can be controlled.
[0051]
The ascending circuit 55A and the descending circuit 55B output an ascending signal and a descending signal to the digital potentiometer 63 in accordance with the time and the number of times the UP button 57a and the DOWN button 57b are pressed.
[0052]
The output resistance of the digital potentiometer 63 changes according to the rising signal and the falling signal output from the rising circuit 55A and the falling circuit 55B. That is, the digital potentiometer 63 requests a pulse signal as an input signal (up signal, down signal), and makes the output resistance variable according to the number of pulses of the input signal. As such a digital potentiometer 63, for example, there is an AD5220 type manufactured by Analog Devices, Inc.
[0053]
The output resistance of the digital potentiometer 63 is converted into a voltage and detected by the engine control computer 45 in the same manner as in the related art, and the engine control computer 45 increases or decreases the rotation speed of the engine 1 according to the output resistance of the potentiometer 43. It has become.
[0054]
In such a configuration, when the fire engine performs a water pumping operation, the engine 1 is started and the fire pump 3 is driven as in the related art. Then, the pumping operation is started, a pumping start signal is input to the pumping determination circuit 25, and the pumping determination circuit 25 connects the vacuum pump 7 and the clutch 9.
[0055]
Further, an automatic pumping signal is output from the pumping determination circuit 25 to the pumping control circuit 53. Then, the pumping control circuit 53 outputs a pumping control signal to the ascending circuit 55A and the descending circuit 55B in order to adjust the engine 1 to the set rotation speed during the pumping operation.
The ascending circuit 55A and the descending circuit 55B output an ascending signal and a descending signal to the digital potentiometer 63 based on the input pumping control signal.
[0056]
The digital potentiometer 63 changes its output resistance based on the number of pulses of the input rising signal or falling signal, converts the output resistance into a voltage, and detects it by the engine control computer 45. Or raise it. Then, the fire pump 3 and the vacuum pump 7 suction water at a rotation speed necessary for pumping water.
Thereafter, when the pumping operation approaches the end, a signal indicating that the water pressure in the firefighting pump 3 has reached the set value is output from the pressure switch 15 to the pumping determination circuit 25 as in the related art, and the pumping operation ends.
[0057]
Next, when performing the water discharging operation, the pressure and the flow rate of the water discharged from the fire pump 3 are detected by the pressure sensor 11 and the flow rate sensor 13 as in the related art.
Then, in the automatic pressure regulation / flow rate comparison circuit 23, the automatic pressure regulation / flow rate signal is adjusted in order to adjust the rotation speed of the engine 1 such that the discharged water pressure and the water amount match the set pressure signal and the set flow rate signal. It is output to the ascending circuit 55A and the descending circuit 55B. The ascending circuit 55A and the descending circuit 55B output an ascending signal and a descending signal to the digital potentiometer 63 based on the automatic pressure regulation / flow rate signal.
[0058]
The digital potentiometer 63 changes the output resistance according to the number of pulses of the input rising signal and falling signal. Then, the voltage is converted and detected by the engine control computer 45, whereby the rotation speed of the engine 1 is controlled.
Further, the control of the ascending circuit 55A and the descending circuit 55B can be manually controlled using the operation panel 57 as described above.
[0059]
At the time of manual pumping operation, for example, the vacuum pump 7 and the clutch 9 are connected manually (or automatically as described above). Then, the fireman presses the UP button 57a or the DOWN button 57b of the operation panel 57 while checking the pressure in the fire pump 3 detected by the pressure sensor 11, and increases the rotation speed of the engine 1.
[0060]
Then, the operation panel 57 is operated until the water pressure in the fire pump 3 reaches the set value, and when the water pressure reaches the set value, the vacuum pump 7 and the clutch 9 are disconnected manually (or automatically as described above). Then, the pumping operation ends. Thereafter, at the time of the water discharging operation, the operator operates the operation panel 57 while maintaining the water pressure and the water amount required at the time of the water discharging operation while watching the water pressure and the water amount detected by the pressure sensor 11 and the flow rate sensor 13.
[0061]
This makes it possible to electrically control the rotation speed of the engine 1. Therefore, since mechanical mechanisms such as the throttle handle 31, the motor 33, and the solenoid 35, which are required for the conventional control device, are not required, the number of components constituting the control device can be reduced, and the cost of the components can be reduced. Can be Also, in the manufacturing process of these components, it is sufficient to attach only the components such as the CPU 51 and the digital potentiometer 63, so that the manufacturing time can be shortened.
[0062]
Furthermore, since there is no mechanical mechanism in the control device, the arrangement space is small, the degree of freedom for the mounting position is increased, and the fire pump 3 can be easily inspected.
[0063]
It should be noted that usually, the manufacturer that manufactures such a control device of the engine 1 is often different from the manufacturer that manufactures the engine (including the engine control computer 45). Therefore, for example, if the specifications of the potentiometer viewed from the engine control computer 45 change significantly, the engine manufacturer will also need to make corresponding modifications, and the design period of the entire fire engine may be lengthened. .
[0064]
However, the digital potentiometer 63 of the present embodiment has the same specification (specification that the output resistance changes) as viewed from the engine control computer 45 as compared with the conventional potentiometer 43. Therefore, there is no influence on the manufacturer of the engine 1 and the design period can be shortened.
[0065]
Further, in the present embodiment, the rising signal and the falling signal which are the inputs of the digital potentiometer 63 are pulse signals, and the digital potentiometer 63 detects the number of pulses of the pulse signal and makes the output resistance variable. However, it is not limited to this.
[0066]
For example, the digital potentiometer 63 may detect the pulse width of the rising signal or the falling signal (for example, in the case of a digital signal, the time during which the input pulse is high or the like). Further, the rising signal and the falling signal may not be pulse signals but may be signals composed of a plurality of bits directly, and the digital potentiometer 63 may receive the signal and vary the output resistance.
[0067]
Further, in the present embodiment, two circuits of the ascending circuit 55A and the descending circuit 55B are used to control the digital potentiometer 63, but the present invention is not limited to this. If the digital potentiometer 63 itself has a switch for switching between ascending and descending, a circuit for simply generating a pulse is sufficient, and one of the ascending circuit 55A and the descending circuit 55B is sufficient.
[0068]
【The invention's effect】
As described above, according to the present invention, since the apparatus is provided with the rise / fall circuit and the pumping control circuit, it is possible to electrically control the engine speed automatically.
Therefore, it is possible to reduce the cost of parts constituting the engine control device, reduce the size of the engine control device to save space, and to facilitate inspection of the pump. Conventionally, the output resistance changes in many cases, but the rotation speed setting means has a specification in which the output resistance changes, so that the existing equipment can be used and applied as it is. it can.
[Brief description of the drawings]
FIG. 1 is a simplified configuration diagram of an engine speed control device according to an embodiment of the present invention.
FIG. 2 is a simplified configuration diagram of a conventional engine speed control device.
[Explanation of symbols]
1 engine
3 fire pumps
7 Vacuum pump
11 Pressure sensor
13 Flow sensor
15 Pressure switch
23 Flow rate comparison circuit
25 Pumping discrimination circuit
45 Engine control computer
51 CPU
53 Pumping control circuit
55A lift circuit
55B descending circuit
57 Operation panel
63 Digital Potentiometer

Claims (7)

An engine mounted on a fire engine,
A pump that suctions water and discharges water according to the rotation speed of the engine;
Inside the pump, pressure detecting means for detecting the pressure of at least one of water sucked into the pump and water discharged from the pump,
Pressure comparison means for comparing the water pressure detected by the pressure detection means with a reference water pressure,
An ascending / descending circuit that outputs a signal for increasing or decreasing the rotation speed of the engine based on a result compared by the pressure comparison means;
Rotation speed setting means for setting the rotation speed of the engine based on a signal output from the raising / lowering circuit,
The engine control device for a fire engine, wherein the number of revolutions of the engine is controlled such that a water pressure detected by the pressure detecting means matches the reference water pressure. An engine mounted on a fire engine,
A pump that suctions water and discharges water according to the rotation speed of the engine;
Flow rate detection means for detecting a flow rate of water sucked into the pump and / or water discharged from the pump;
Flow rate comparing means for comparing the flow rate of the water detected by the flow rate detecting means with a reference flow rate;
An ascending / descending circuit that outputs a signal for increasing and decreasing the rotation speed of the engine based on a result compared by the flow rate comparing means;
Rotation speed setting means for setting the rotation speed of the engine based on a signal output from the raising / lowering circuit,
The engine control device for a fire engine, wherein the number of revolutions of the engine is controlled such that a flow rate of water detected by the flow rate detection means matches the reference flow rate. An engine mounted on a fire engine,
A pump that suctions water and discharges water according to the rotation speed of the engine;
Inside the pump, pressure detecting means for detecting the pressure of at least one of water sucked into the pump and water discharged from the pump,
Flow rate detection means for detecting a flow rate of water sucked into the pump and / or water discharged from the pump;
A pressure comparison unit in which the water pressure detected by the pressure detection unit is compared with a reference water pressure, and a flow comparison unit in which the flow rate of the water detected by the flow detection unit is compared with a reference flow amount.
An ascending / descending circuit that outputs a signal for increasing or decreasing the rotation speed of the engine based on a result of comparison by the pressure comparison unit and the flow rate comparison unit;
Rotation speed setting means for setting the rotation speed of the engine based on a signal output from the raising / lowering circuit,
The rotation speed of the engine is controlled such that the water pressure detected by the pressure detection means matches the reference water pressure, and the flow rate of the water detected by the flow rate detection means matches the reference flow rate. An engine control device for a fire engine. An engine mounted on a fire engine,
A pump that suctions water and discharges water according to the rotation speed of the engine;
A vacuum pump connected to the pump and driven during a pumping operation for vacuuming the inside of the pump;
Inside the pump, pressure detecting means for detecting the pressure of at least one of water sucked into the pump and water discharged from the pump,
Pumping determining means for starting the pumping operation when a pumping start command is input, and terminating the pumping operation when the water pressure detected by the pressure detecting means exceeds a reference water pressure,
A pumping control circuit that outputs a pumping control signal during the period from the start to the end,
An ascending / descending circuit that outputs a signal for increasing and decreasing the engine speed based on the pumping control signal output from the pumping control circuit;
An engine control device for a fire engine, comprising: rotation speed setting means for setting a rotation speed of the engine based on a signal output from the raising / lowering circuit. An engine mounted on a fire engine,
A pump that suctions water and discharges water according to the rotation speed of the engine;
Setting means capable of setting the number of revolutions of the engine;
An ascending / descending circuit that outputs a signal for increasing or decreasing the rotation speed of the engine based on the setting in the setting unit;
An engine control device for a fire engine, comprising: rotation speed setting means for setting a rotation speed of the engine based on a signal output from the raising / lowering circuit. The signal output from the raising / lowering circuit is a pulse signal, and the output resistance of the rotation number setting unit is changed according to the pulse signal. Engine control equipment for fire trucks. The engine control device for a fire engine according to any one of claims 1 to 6, wherein the lifting / lowering circuit and / or the pumping control circuit are formed on a substrate.

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