CN113457049A - Variable-attitude constant-pressure control method, device and system for boom water cannon and fire fighting truck - Google Patents
Variable-attitude constant-pressure control method, device and system for boom water cannon and fire fighting truck Download PDFInfo
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- CN113457049A CN113457049A CN202110587493.3A CN202110587493A CN113457049A CN 113457049 A CN113457049 A CN 113457049A CN 202110587493 A CN202110587493 A CN 202110587493A CN 113457049 A CN113457049 A CN 113457049A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C27/00—Fire-fighting land vehicles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/28—Accessories for delivery devices, e.g. supports
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
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Abstract
The invention provides a variable-attitude constant-pressure control method, device and system for a boom water cannon and a fire engine, and belongs to the field of fire fighting. The constant voltage control method includes: acquiring a water cannon inlet pressure value in real time; if the water cannon inlet pressure value does not belong to the preset range, adjusting the outlet pressure value of the water pump by adjusting the rotating speed of an engine so as to control the water cannon inlet pressure value within the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation. When the elevating fire truck operates in water-fetching, the rotating speed of the chassis engine is synchronous with the rotating speed of the water pump, and the inlet pressure of the water cannon is automatically adjusted along with the action of the arm support, so that the outlet pressure of the water cannon is kept stable, the fire extinguishing spray water of the water cannon is stabilized in a set range, and the rescue efficiency is improved.
Description
Technical Field
The invention relates to the field of fire fighting, in particular to a variable-attitude constant-pressure control method for an arm support water cannon, a variable-attitude constant-pressure control device for the arm support water cannon, an arm support fire fighting system and a fire fighting truck.
Background
The elevating fire truck is commonly used for high-rise fire-fighting and rescue work, in particular to the elevating jet fire truck, the main rescue task is water-spraying fire-fighting, and the operating rapidity and the simplification requirements on the operation of water-pumping operation are higher. When the conventional lifting vehicle operates the arm support in the water-fetching operation, the arm support structure is damaged because the water-fetching counter force of a water cannon possibly exceeds the bearing force of the arm support due to the action of the arm support, in order to ensure that the water-fetching pressure of the water cannon is maintained to be relatively stable within a certain range, the rotating speed of the water pump is firstly reduced, then the arm support action is carried out, the rotating speed of the water pump is adjusted after the arm support action is finished, the operation of the whole process is complex, and the whole rescue efficiency is influenced.
Disclosure of Invention
The invention aims to provide a variable-attitude constant-pressure control method for a boom water cannon, a variable-attitude constant-pressure control device for the boom water cannon, a boom fire-fighting system and a fire engine, which are used for at least solving the problem that the water outlet pressure of the water cannon is automatically stable when the attitude of the water cannon is changed.
In order to achieve the above object, a first aspect of the present invention provides a boom water cannon posture-changing constant-pressure control method, where the control method includes:
acquiring a water cannon inlet pressure value in real time;
if the water cannon inlet pressure value does not belong to the preset range, adjusting the outlet pressure value of the water pump by adjusting the rotating speed of an engine so as to control the water cannon inlet pressure value within the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation.
Optionally, the maximum value of the preset range is less than or equal to the maximum pressure value allowed by the water cannon control system.
Optionally, the method further includes:
responding to a switching instruction, switching the water cannon control system to a manual control mode, and under the manual control mode, adjusting the rotating speed value of the engine through a manual control signal so as to control the inlet pressure value of the water cannon within a preset range.
Optionally, the adjusting the outlet pressure value of the water pump by adjusting the rotation speed of the engine to control the inlet pressure value of the water cannon within a preset range includes:
and calculating and adjusting the rotating speed value of the engine to adjust the outlet pressure value of the water pump according to the difference value between the water cannon inlet pressure value and the average value of a preset range, so as to control the water cannon inlet pressure value within the preset range.
Optionally, the adjusting the outlet pressure value of the water pump by adjusting the rotation speed of the engine to control the inlet pressure value of the water cannon within a preset range includes:
obtaining the current water supply height of the water cannon and the flow of the water pump, and calculating to obtain a water cannon loss pressure value P according to the corresponding relation among the water supply height of the water cannon, the water cannon loss pressure and the flow of the water pumpLoss of power；
By using the outlet pressure value P of the water pumpWater pumpThe current water pump flow, the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpDetermining the current theoretical chassis engine speed according to the corresponding relation of the three; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference between the pressure and the set value of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine according to the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range.
The invention also provides a water cannon constant-pressure control device for changing the posture of the arm support, which comprises:
the acquisition module is used for acquiring the pressure value of the water cannon inlet in real time;
the control module is used for adjusting the outlet pressure value of the water pump by adjusting the rotating speed value of the engine when the inlet pressure value of the water cannon is not in a preset range, so that the inlet pressure value of the water cannon is controlled in the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation.
Optionally, the maximum value of the preset range is less than or equal to the maximum pressure value allowed by the water cannon control system.
Optionally, the control module is further configured to switch the water cannon control system to a manual control mode in response to a switching instruction, and in the manual control mode, adjust a rotation speed value of the engine through a manual control signal to control the water cannon inlet pressure value within a preset range.
Optionally, the control module is specifically configured to calculate and adjust a rotation speed value of the engine to adjust an outlet pressure value of the water pump according to a difference between a water cannon inlet pressure value obtained in real time and an average value of a preset range, so as to control the water cannon inlet pressure value within the preset range.
Optionally, the control module is specifically configured to obtain a current water cannon water supply height and a current water pump flow, and obtain a water cannon loss pressure value P according to a corresponding relationship among the water cannon water supply height, the water cannon loss pressure, and the water pump flowLoss of power；
By using the outlet pressure value P of the water pumpWater pumpAnd the rotating speed of the water pump, the flow rate of the water pump and the outlet pressure value P of the water pumpWater pumpDetermining the current theoretical chassis engine speed according to the corresponding relation of the three; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference between the current flow of the water pump and the preset value of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine through the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range.
The invention also provides a water cannon constant pressure control system for changing the posture of the arm support, the control system comprises a driving device, a water cannon and an engine, the engine provides water pressure for the water cannon through the driving device, and the water cannon constant pressure control system further comprises:
the system comprises a controller, a water cannon inlet pressure sensor and a water cannon operator;
the controller is used for setting the control device;
the water cannon inlet pressure sensor is used for acquiring a water pump inlet pressure value of the water cannon in real time;
the water cannon operator is used for inputting a preset range of water pump inlet pressure of the water cannon;
the controller is used for adjusting the outlet pressure value of the water pump so as to control the inlet pressure value of the water cannon within the preset range.
The invention also provides a fire fighting truck which comprises the arm support fire fighting system.
Through the technical scheme, when the elevating fire truck operates in a water-spraying mode, the rotating speed of the chassis engine is synchronous with the rotating speed of the water pump, and the inlet pressure of the water cannon is automatically adjusted along with the action of the arm support, so that the outlet pressure of the water cannon is kept stable, the water cannon extinguishes and sprays water stably in the set range, and the rescue efficiency is improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic flow chart of a boom water cannon posture-changing constant-pressure control method according to an embodiment of the invention;
fig. 2 is a schematic flow chart of a boom water cannon posture-changing constant-pressure control method according to another embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The embodiment of the invention provides a variable-attitude constant-pressure control method for a boom water cannon, which comprises the following steps:
acquiring a water cannon inlet pressure value in real time; if the water cannon inlet pressure value does not belong to the preset range, adjusting the outlet pressure value of the water pump by adjusting the rotating speed of an engine so as to control the water cannon inlet pressure value within the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation. Specifically, a water cannon inlet pressure sensor is arranged at a water cannon inlet, and a control module detects that the water cannon inlet pressure value does not belong to a preset range through the water cannon inlet pressure sensor; adjusting the outlet pressure value of the water pump by adjusting the rotating speed of an engine so as to control the inlet pressure value of the water cannon within a preset range; the rotating speed of the engine is the same as that of the chassis engine, and the water cannon inlet pressure value is rapidly adjusted to be within a preset pressure range (+/-5% of a water cannon inlet pressure set value).
Further, as shown in fig. 1, in a possible embodiment, the adjusting the outlet pressure value of the water pump by adjusting the rotation speed of the engine to control the inlet pressure value of the water cannon within a preset range includes:
and calculating and adjusting the rotating speed value of the engine to adjust the outlet pressure value of the water pump according to the difference value between the water cannon inlet pressure value and the average value of a preset range, so as to control the water cannon inlet pressure value within the preset range. Specifically, the engine is adjusted according to empirical data between the difference value of the water cannon inlet pressure value and the set value and the rotating speed of the engine. Therefore, the pressure value of the water cannon inlet is adjusted to be within the preset pressure range more quickly, and the fire extinguishing efficiency is guaranteed.
Further, as shown in fig. 2, in another possible embodiment, the adjusting the outlet pressure value of the water pump by adjusting the rotation speed of the engine to control the inlet pressure value of the water cannon within a preset range includes:
obtaining the current water supply height of the water cannon and the flow of the water pump, and calculating to obtain a water cannon loss pressure value P according to the corresponding relation among the water supply height of the water cannon, the water cannon loss pressure and the flow of the water pumpLoss of power；
By using water pump outletPressure value PWater pumpThe current water pump flow, the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpDetermining the current theoretical chassis engine speed according to the corresponding relation of the three; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference between the pressure and the set value of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine according to the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range. Specifically, height sensor that sets up on the water cannon detects water cannon and supplies water height and set up flow sensor on water pump outlet pipe way and detect water pump flow, does not belong to the scope of predetermineeing when water cannon entry pressure value, and application water cannon supplies water height, water cannon loss pressure and water pump flow three's corresponding relation obtains water cannon loss pressure value PLoss of power. Specifically, the outlet pressure value P of the water pumpWater pumpWater cannon inlet pressure preset value and water cannon loss pressure value PLoss of power(ii) a The outlet pressure value P of the water pumpWater pumpBy using the rotating speed of the water pump, the flow rate of the water pump and the outlet pressure value P of the water pumpWater pumpAnd determining the theoretical chassis engine speed according to the corresponding relation of the three. Water pump rotation speed, water pump flow and water pump outlet pressure value PWater pumpThe corresponding relation of the three is the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpThe data of the relationship curve of the three can obtain the numerical value of the rest third person according to the values of any two variables. For example, when the water supply height of a water cannon is 30 m, the pressure loss P is caused by the height differenceHeight ofThe maximum allowable value of the water pump flow rate is 80L/S due to the loss of the pipeline along the layer is 0.3MPa according to GB/T7956; loss pressure value P of water cannonLoss of powerPressure of PHeight of+PPipe0.6 MPa; when the preset value of the water cannon inlet pressure is 1MPa and the water supply height of the water cannon is 30 meters, the water pump rotating speed, the water pump flow and the water pump outlet pressure value P of a water pump according to GB10-100 modelWater pumpThe corresponding relation of the three parts obtains the rotating speed of the impeller to be 4000 r/min; if the speed increasing ratio of the water pump is 1.5 and the speed increasing ratio of the chassis power takeoff is 1.5When the rotating speed of the chassis is 1.5, the rotating speed of the chassis is 1780r/min, namely the theoretical rotating speed of the chassis engine. During initialization, a water cannon loss pressure value P is setLoss of powerAnd in the whole process, the control system can automatically correct according to the actual conditions such as the water supply height of the water cannon so as to ensure the reliability of the whole operation of the system. And adjusting the rotating speed of the engine according to the calculated theoretical rotating speed, so that the pressure of the water cannon inlet is within +/-5% of a set value, and the reliability of water supply of the water cannon is ensured.
Further, the maximum value of the preset range is smaller than or equal to the maximum pressure value allowed by the water cannon control system. Specifically, the set value of the pressure at the inlet of the water cannon is a value which can be set by an operator, when the maximum value of the preset range exceeds the maximum pressure value allowed by the control system, the maximum value of the preset range is automatically corrected by the system and is changed into the maximum pressure value allowed by the system, so that the safety of the vehicle is ensured.
Optionally, the boom water cannon posture-changing constant-pressure control method further includes: responding to a switching instruction, switching the water cannon control system to a manual control mode, and under the manual control mode, adjusting the rotating speed value of the engine through a manual control signal so as to control the inlet pressure value of the water cannon within a preset range. The design here makes things convenient for the fire fighter to carry out the selection of control mode to the scene of putting out a fire, the unexpected control demand of adaptation that can be better. The firemen can input switching instructions through a switching button on the water cannon operator, then stop an automatic control mode, and control the rotating speed of the chassis engine through a control signal triggered manually.
Correspondingly, the invention also provides a boom water cannon attitude-changing constant-pressure control device, which comprises: the control device includes:
the acquisition module is used for acquiring the pressure value of the water cannon inlet in real time;
the control module is used for adjusting the outlet pressure value of the water pump by adjusting the rotating speed value of the engine when the inlet pressure value of the water cannon is not in a preset range, so as to control the inlet pressure value of the water cannon in the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation.
Optionally, the maximum value of the preset range is less than or equal to the maximum pressure value allowed by the water cannon control system.
Optionally, the control module is further configured to switch the water cannon control system to a manual control mode in response to a switching instruction, and in the manual control mode, adjust a rotation speed value of the engine through a manual control signal to control the water cannon inlet pressure value within a preset range.
Optionally, the control module is specifically configured to calculate and adjust a rotation speed value of the engine to adjust an outlet pressure value of the water pump according to a difference between a water cannon inlet pressure value and an average value of a preset range, so as to control the water cannon inlet pressure value within the preset range.
Optionally, the control module is specifically configured to obtain a current water cannon water supply height and a current water pump flow, and calculate a water cannon loss pressure value P according to a corresponding relationship among the water cannon water supply height, the water cannon loss pressure, and the water pump flowLoss of power；
By using the outlet pressure value P of the water pumpWater pumpThe current water pump flow, the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpDetermining the current theoretical chassis engine speed according to the corresponding relation of the three; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference between the pressure and the preset value of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine according to the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range.
This embodiment still provides a water cannon constant voltage control system for cantilever crane becomes gesture, control system includes drive arrangement, water cannon and engine, the engine passes through drive arrangement is like water cannon water supply system to the water cannon provides water pressure, and control system still includes:
the system comprises a controller, a water cannon inlet pressure sensor and a water cannon operator;
the controller is used for setting the control device; the controller can be a central controller of a fire engine or an ECU controller of an engine.
The water cannon inlet pressure sensor is used for acquiring a water pump inlet pressure value of the water cannon in real time;
the water cannon operator is used for inputting a preset range of water pump inlet pressure of the water cannon;
the controller is used for adjusting the outlet pressure value of the water pump so as to control the inlet pressure value of the water cannon within the preset range.
Preferably, the control system further comprises a flow sensor for detecting the flow of the water pump; the controller is used for acquiring the current water cannon water supply height and the current water pump flow, and calculating to obtain a water cannon loss pressure value P according to the corresponding relation among the water cannon water supply height, the water cannon loss pressure and the water pump flowLoss of power；
By using the outlet pressure value P of the water pumpWater pumpThe current water pump flow, the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpDetermining the current theoretical chassis engine speed according to the corresponding relation of the three; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference between the pressure and the preset value of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine according to the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range.
The invention also provides a fire fighting truck which comprises the arm support fire fighting system. In the process that the arm support is adjusted according to the requirement, the interval time for generating the signal that the water cannon inlet pressure value exceeds the pressure threshold range is far longer than the adjusting time for returning the water cannon inlet pressure value corresponding to the chassis rotating speed to the preset range, so that the water cannon inlet pressure value can be automatically adjusted in the preset range in the arm support adjusting process, and the fire extinguishing efficiency of the water cannon is guaranteed.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (12)
1. A water cannon constant pressure control method for changing the posture of a boom is characterized by comprising the following steps:
acquiring a water cannon inlet pressure value in real time;
if the water cannon inlet pressure value does not belong to the preset range, adjusting the outlet pressure value of the water pump by adjusting the rotating speed of an engine so as to control the water cannon inlet pressure value within the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation.
2. The control method according to claim 1, characterized in that:
and the maximum value of the preset range is less than or equal to the maximum pressure value allowed by the water cannon control system.
3. The control method according to claim 1, characterized in that the method further comprises:
responding to a switching instruction, switching the water cannon control system to a manual control mode, and under the manual control mode, adjusting the rotating speed value of the engine through a manual control signal so as to control the inlet pressure value of the water cannon within a preset range.
4. The control method according to claim 1, wherein the adjusting of the outlet pressure value of the water pump by adjusting the rotation speed of an engine to control the water cannon inlet pressure value within a preset range comprises:
and calculating and adjusting the rotating speed value of the engine to adjust the outlet pressure value of the water pump according to the difference value between the water cannon inlet pressure value and the average value of a preset range, so as to control the water cannon inlet pressure value within the preset range.
5. The control method according to claim 1, wherein the adjusting of the outlet pressure value of the water pump by adjusting the rotation speed of an engine to control the water cannon inlet pressure value within a preset range comprises:
obtaining the current water supply height of the water cannon and the flow of the water pump, and calculating to obtain a water cannon loss pressure value P according to the corresponding relation among the water supply height of the water cannon, the water cannon loss pressure and the flow of the water pumpLoss of power；
By using the outlet pressure value P of the water pumpWater pumpThe current water pump flow, the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpDetermining the current theoretical chassis engine speed according to the corresponding relation of the three; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference with the average value of the preset range of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine according to the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range.
6. A water cannon constant pressure control device for changing the posture of a boom is characterized by comprising:
the acquisition module is used for acquiring the pressure value of the water cannon inlet in real time;
the control module is used for adjusting the outlet pressure value of the water pump by adjusting the rotating speed value of the engine when the inlet pressure value of the water cannon is not in a preset range, so that the inlet pressure value of the water cannon is controlled in the preset range; and the inlet pressure value of the water cannon and the outlet pressure value of the water pump have a corresponding relation.
7. The control device of claim 6, wherein the control module is further configured to set a maximum value in the preset range to be less than or equal to a maximum pressure value allowed by a water cannon control system.
8. The control device of claim 6, wherein the control module is further configured to switch the water cannon control system to a manual control mode in response to a switch command, and in the manual control mode, the rotational speed value of the engine is adjusted through a manual control signal so as to control the water cannon inlet pressure value within a preset range.
9. The control device according to claim 6, wherein the control module is specifically configured to calculate and adjust a rotation speed value of the engine to adjust an outlet pressure value of the water pump according to a difference between a water cannon inlet pressure value and an average value of a preset range, so as to control the water cannon inlet pressure value within the preset range.
10. The control device according to claim 6, wherein the control module is specifically configured to obtain a current water cannon water supply height and a current water pump flow, and calculate a water cannon loss pressure value P according to a correspondence relationship among the water cannon water supply height, the water cannon loss pressure and the water pump flowLoss of power；
By using the outlet pressure value P of the water pumpWater pumpThe current water pump flow, the water pump rotating speed, the water pump flow and the water pump outlet pressure value PWater pumpThe correspondence of the threeDetermining the current theoretical chassis engine speed; the water cannon loss pressure value PLoss of powerIs the outlet pressure value P of the water pumpWater pumpThe difference between the pressure and the preset value of the water cannon inlet pressure;
and adjusting the rotating speed value of the engine according to the current theoretical chassis engine rotating speed, so as to adjust the outlet pressure value of the water pump, and control the inlet pressure value of the water cannon within the preset range.
11. The utility model provides a water cannon constant voltage control system for cantilever crane becomes gesture, control system includes drive arrangement, water cannon and engine, the engine passes through drive arrangement to the water cannon provides water pressure, its characterized in that still includes:
the system comprises a controller, a water cannon inlet pressure sensor and a water cannon operator;
the controller is used for setting the control device according to any one of claims 6-10;
the water cannon inlet pressure sensor is used for acquiring a water pump inlet pressure value of the water cannon in real time;
the water cannon operator is used for inputting a preset range of water pump inlet pressure of the water cannon;
the controller is used for adjusting the outlet pressure value of the water pump so as to control the inlet pressure value of the water cannon within the preset range.
12. A fire fighting vehicle characterized by comprising the control system of claim 11.
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