CN114987197A - Single-shot transmission and control system for eliminating load impact and sanitation vehicle - Google Patents

Single-shot transmission and control system for eliminating load impact and sanitation vehicle Download PDF

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Publication number
CN114987197A
CN114987197A CN202210607045.XA CN202210607045A CN114987197A CN 114987197 A CN114987197 A CN 114987197A CN 202210607045 A CN202210607045 A CN 202210607045A CN 114987197 A CN114987197 A CN 114987197A
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China
Prior art keywords
control system
variable pump
valve
way reversing
reversing valve
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CN202210607045.XA
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Chinese (zh)
Inventor
张良军
艾志浩
黄磊
罗方娜
姜方宁
颜祯
刘如意
周振峰
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Changsha Zoomlion Environmental Industry Co Ltd
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Changsha Zoomlion Environmental Industry Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K25/00—Auxiliary drives
    • B60K25/06—Auxiliary drives from the transmission power take-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/344—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/30—Conjoint control of vehicle sub-units of different type or different function including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K25/00—Auxiliary drives
    • B60K25/06—Auxiliary drives from the transmission power take-off
    • B60K2025/065—Auxiliary drives from the transmission power take-off the transmission being fluidic, e.g. hydraulic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)

Abstract

The application discloses a single-shot transmission and control system for eliminating load impact, which comprises a chassis engine, a clutch, a gearbox, a split power takeoff, a transfer case, a variable pump, a multi-way reversing valve and an electric control system, wherein the split power takeoff is in driving connection with the gearbox; the input end of the transfer case is in driving connection with the output end of the separated power takeoff; the power input end of the variable pump is in driving connection with the corresponding output end of the transfer case, and the flow regulating device of the variable pump automatically maintains the discharge capacity of the variable pump within a set range value according to the pressure difference change of the valve ports of the multi-way reversing valve; the hydraulic input end of the multi-way reversing valve is connected with a hydraulic output end pipeline of the variable pump, and the hydraulic output end of the multi-way reversing valve is connected with a hydraulic motor pipeline connected with the upper-mounted operation device; and the electric control system is respectively and electrically connected with the separated power takeoff, the transfer case and the multi-way reversing valve. The application eliminates the impact on the engine and the transmission component, thereby prolonging the service life of the engine and the transmission component.

Description

Single-shot transmission and control system for eliminating load impact and sanitation vehicle
Technical Field
The application relates to the technical field of sanitation equipment, in particular to a single-shot cleaning vehicle transmission and control system for eliminating load impact and a sanitation vehicle.
Background
With the stricter requirements of the country on emission and energy consumption, urban road cleaning vehicles such as road sweeper, washing sweeper, cleaning vehicle, multifunctional dust suppression vehicle and the like have single-engine driven products in succession, so as to replace products which are generally driven by a chassis engine and driven by an auxiliary engine to drive an upper-mounted operation device. The single-engine driven product can realize the running of the vehicle driven by single power and can also drive the running and loading operation of the vehicle simultaneously. The vehicle adopts constant-speed cruising mechanical transmission and hydraulic system transmission to drive an operation device to ensure constant operation effect.
The existing single-engine driven urban road cleaning vehicle needs high-power output to drive a loading operation device with a large load in order to ensure the operation effect. If special or emergency situations occur, the work needs to be suspended and recovered within a short time, and in the process of stepping down the clutch to suspend the work and then recover the work state, the engine needs to bear large impact from an unloading state to a loading state. Because the existing chassis engine is generally an electronic fuel injection engine, when unloading, the chassis engine can quickly respond and reduce fuel injection quantity, and the rotating speed of the engine can keep high rotating speed in a short time without causing large energy consumption and loss of transmission parts. During loading, because the oil injection quantity of the engine is small at the moment, the output power and the torque are small, if the load is instantly switched from zero to a large load, the rotating speed of the engine is rapidly reduced, even flameout is caused, great impact is caused to each transmission part, and the service lives of the engine and the transmission part are greatly reduced for a long time.
Disclosure of Invention
The embodiment of the application provides a single-engine transmission and control system for eliminating load impact on one hand, so as to solve the technical problem that the service life of an engine and a transmission part is greatly shortened due to impact on the engine and the transmission part caused by unloading to loading processes of an existing single-engine driven sanitation vehicle.
The technical scheme adopted by the application is as follows:
a single-shot transmission and control system for eliminating load impact comprises a chassis engine, a clutch and a gearbox, and also comprises:
the split power takeoff is in driving connection with the gearbox to obtain power;
the input end of the transfer case is in driving connection with the output end of the separated power takeoff;
the power input end of the variable pump is in driving connection with the corresponding output end of the transfer case, and the flow regulating device of the variable pump automatically maintains the discharge capacity of the variable pump within a set range value according to the pressure difference change of the valve ports of the multi-way reversing valve;
the hydraulic input end of the multi-way reversing valve is connected with the hydraulic output end pipeline of the variable pump, and the hydraulic output end of the multi-way reversing valve is connected with the hydraulic motor pipeline connected with the upper-mounted operation device;
and the electric control system is respectively electrically connected with the separated power takeoff, the transfer case and the multi-way reversing valve and is used for controlling the output of the transfer case, controlling the separated power takeoff and the multi-way reversing valve to execute corresponding actions and eliminating load impact according to the clutch state of the clutch.
Further, the separable power takeoff adopts a separable friction power takeoff.
Furthermore, the variable pump adopts a variable plunger pump or a variable vane pump.
Furthermore, the multi-way directional valve is connected with the flow regulating device of the variable pump through an oil way, and when the hydraulic oil pressure difference of the valve port of the multi-way directional valve exceeds a set range value, the multi-way directional valve drives the flow regulating device of the variable pump to correspondingly regulate the displacement of the variable pump through the pressure oil and maintains the displacement within the set range value.
Further, when the hydraulic oil pressure difference of the valve port of the multi-way reversing valve is larger than a set range value, the multi-way reversing valve drives the flow regulating device of the variable pump to continuously reduce the displacement of the variable pump until the displacement is within the set range value through the hydraulic oil;
when the hydraulic oil pressure difference of the valve port of the multi-way reversing valve is less than the set range value, the multi-way reversing valve drives the flow regulating device of the variable pump through the pressure oil to continuously increase the discharge capacity of the variable pump until the discharge capacity is within the set range value.
Furthermore, the multi-way reversing valve and the flow regulating device of the variable pump are electrically connected with the electric control system, and the electric control system is further used for sending an instruction to the flow regulating device of the variable pump according to the collected hydraulic oil pressure difference of the valve port of the multi-way reversing valve, and controlling the flow regulating device of the variable pump to correspondingly regulate the displacement of the variable pump to be maintained within a set range value.
Further, when the collected hydraulic oil pressure difference of the valve port of the multi-way reversing valve is larger than a set range value, the electric control system sends an instruction to the flow regulating device of the variable pump to control the flow regulating device of the variable pump to continuously reduce the displacement of the variable pump until the displacement is within the set range value;
when the collected hydraulic oil pressure difference of the valve ports of the multiple directional control valves is smaller than a set range value, the electric control system sends an instruction to the flow regulating device of the variable pump to control the flow regulating device of the variable pump to continuously increase the discharge capacity of the variable pump until the discharge capacity of the variable pump is within the set range value.
Further, the electronic control system controls the separation type power takeoff and the multi-way reversing valve to execute corresponding actions and eliminate load impact according to the clutch state of the clutch, and specifically comprises:
when the operation is started, the electric control system receives a clutch engaging signal, controls the combination of the separated power takeoff, and enables the valve port of the multi-way reversing valve to be opened to a preset opening degree step by step according to a set speed, so that the rotating speed of the hydraulic motor is gradually increased to a working rotating speed to start normal operation of the loading operation device.
Further, the electronic control system controls the separation type power takeoff and the multi-way reversing valve to execute corresponding actions and eliminate load impact according to the clutch state of the clutch, and specifically comprises:
before gear shifting, when a pedal is stepped on to enable a clutch to be disengaged, after the electronic control system receives a clutch disengagement signal, the separated power takeoff is controlled to be separated, a valve port of the multi-way reversing valve is closed in real time, and the hydraulic motor stops rotating to suspend operation of the loading operation device;
after gear shifting is finished, when the pedal is loosened by feet to enable the clutch to be meshed, after the electronic control system receives a clutch meshing signal, the electronic control system controls the combination of the separated power takeoff and enables the valve port of the multi-way reversing valve to be gradually opened to a preset opening degree according to a set speed, and the rotating speed of the hydraulic motor gradually rises to a working rotating speed to restore normal operation of the loading operation device.
The application also provides a sanitation vehicle, which comprises the single-shot transmission and control system for eliminating load impact.
Compared with the prior art, the method has the following beneficial effects:
the application provides a single-shot transmission and control system for eliminating load impact, which comprises a chassis engine, a clutch, a gearbox, a split power takeoff, a transfer case, a variable pump, a multi-way reversing valve and an electric control system, wherein the split power takeoff is in driving connection with the gearbox to obtain power; the input end of the transfer case is in driving connection with the output end of the separated power takeoff; the power input end of the variable pump is in driving connection with the corresponding output end of the transfer case, and the flow regulating device of the variable pump automatically regulates the discharge capacity of the variable pump to be maintained within a set range value according to the pressure difference change of the valve port of the multi-way reversing valve; the hydraulic input end of the multi-way reversing valve is connected with the hydraulic output end pipeline of the variable pump, and the hydraulic output end of the multi-way reversing valve is connected with the hydraulic motor pipeline connected with the upper-mounted operation device; and the electric control system is respectively electrically connected with the separated power takeoff, the transfer case and the multi-way reversing valve and is used for controlling the output of the transfer case and controlling the separated power takeoff and the multi-way reversing valve to execute corresponding actions according to the clutch state of the clutch so as to eliminate load impact. The single-shot loading operation effect is guaranteed through the electric and hydraulic combined control system, the impact on transmission parts such as a chassis engine, a gearbox, a separated power takeoff and the like during the process of shifting from loading to unloading and reloading during operation is eliminated, and the reliability and the durability of the parts are improved to the maximum extent; the chassis engine is not required to be controlled to have constant rotating speed during operation, the gear shifting can be carried out normally, the driving habit of a driver can not be changed, the phenomenon of misoperation is greatly reduced, the safety of road cleaning work is ensured, and the service life of products and parts is greatly prolonged.
In addition to the above-described objects, features and advantages, there are other objects, features and advantages of the present application. The present application will now be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments of the application are intended to be illustrative of the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a single-shot transmission and control system for eliminating load shock according to the preferred embodiment of the present application.
FIG. 2 is a schematic view of the single-shot transmission and control system of the preferred embodiment of the present application during normal operation.
FIG. 3 is a schematic diagram of the transmission during a shift in the single-shot transmission and control system of the preferred embodiment of the present application.
FIG. 4 is a schematic diagram of a single-shot transmission and control system for eliminating load shock according to another preferred embodiment of the present application.
In the figure: 1. an electronic control system; 2. a chassis engine; 3. a gearbox; 4. a rear axle; 5. a separate power takeoff; 6. a transfer case; 7. a variable displacement pump; 8. a first water pump; 9. a multi-way directional valve; 10. a fan motor; 11. a fan; 12. a second water pump; 13. a water pump motor; 14. a clutch; 15. and (5) assembling the operation device.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the preferred embodiment of the present application provides a single-shot transmission and control system for eliminating load impact, which comprises a chassis engine 2, a clutch 14, a gearbox 3, an electronic control system 1, a split power takeoff 5, a transfer case 6, a variable displacement pump 7 and a multi-way reversing valve 9, wherein the split power takeoff 5 is in driving connection with the gearbox 3 to obtain power; the input end of the transfer case 6 is in driving connection with the output end of the separated power takeoff 5; the power input end of the variable pump 7 is in driving connection with one output end of the transfer case 6, the other output end of the transfer case 6 is in driving connection with a first water pump 8, the first water pump 8 is a low-pressure blade type water pump with low requirements generally, and a flow regulating device of the variable pump 7 automatically maintains the discharge capacity of the variable pump 7 within a set range value according to the pressure difference change of a valve port of the multi-way reversing valve 9; the hydraulic input end of the multi-way directional valve 9 is connected with the hydraulic output end pipeline of the variable displacement pump 7, the hydraulic output end of the multi-way directional valve 9 is connected with the hydraulic motor pipeline connected with the upper installation operation device 15, wherein the hydraulic motor of the embodiment comprises a fan motor 10 and a water pump motor 13, the upper installation operation device 15 comprises a fan 11 driven by the fan motor 10 and a second water pump 12 driven by the water pump motor 13, and the second water pump 12 is generally a high-pressure water pump. The electric control system 1 is respectively electrically connected with the separated power takeoff 5, the transfer case 6 and the multi-way reversing valve 9 and is used for controlling the output of the transfer case 6 and controlling the separated power takeoff 5 and the multi-way reversing valve 9 to execute corresponding actions and eliminate load impact according to the clutch state of the clutch 14.
In the above embodiment, the split power takeoff is 5 a separable friction power takeoff, which includes a cylinder, a friction plate, a driving gear, a driven gear, and an output shaft. The driving gear is meshed with a middle shaft gear of the gearbox 3, and the cylinder controls the separation and the meshing of the friction plates so as to control the separation and the meshing of the driving gear and the driven gear, so that the transmission starting and stopping of the output shaft are realized.
The variable displacement pump 7 adopts a variable displacement plunger pump or a variable displacement vane pump, the variable displacement plunger pump is adopted in the embodiment, the flow regulating device of the variable displacement plunger pump is mainly a swash plate positioned in the pump, and the flow can be regulated by regulating the inclination angle of the swash plate.
The multi-way directional valve 9 is connected with the flow regulating device of the variable pump 7 through an oil path, and when the hydraulic oil pressure difference at the valve port of the multi-way directional valve 9 exceeds a set range value, the multi-way directional valve 9 drives the flow regulating device of the variable pump 7 through pressure oil to correspondingly regulate the displacement of the variable pump 7 and maintain the displacement within the set range value, which specifically includes two working conditions:
when the hydraulic oil pressure difference of the valve port of the multi-way directional valve 9 is larger than a set range value, the multi-way directional valve 9 drives the flow regulating device of the variable pump 7 to continuously reduce the displacement of the variable pump 7 until the displacement is within the set range value through pressure oil;
when the hydraulic oil pressure difference of the valve port of the multi-way directional valve 9 is less than the set range value, the multi-way directional valve 9 drives the flow regulating device of the variable pump 7 through the pressure oil to continuously increase the displacement of the variable pump 7 until the displacement is within the set range value.
The principle of the always stable operation of the upper working device 15 of the present embodiment will be described in detail below:
in order to realize power decoupling and load sensitivity and realize operation effect without being influenced by the rotating speed of the chassis engine 2, the traditional sanitation vehicle is provided with two power systems of the chassis engine 2 and the upper engine, the chassis engine 2 drives the vehicle to run, the upper engine provides power for the operation of the upper operation device 15, and the two power systems are independent and do not interfere with each other. The operation effect of the upper mounting operation device 15 is only influenced by the rotating speed of the upper mounting engine and is irrelevant to the chassis engine 2, obviously, the mode has high cost and large pollution and does not meet the current environmental protection requirement. The single-engine sanitation truck is low in cost, energy-saving and environment-friendly. However, the single-engine sanitation truck lacks two independent power systems, and the same engine provides power for the running of the truck and the operation of the upper operation device 15 during operation, so the single-engine sanitation truck has to overcome the defect of the fluctuation of the rotating speed of the chassis engine 2, otherwise, the single-engine sanitation truck not only affects the operation effect, but also cannot enable a user to obtain the same experience as the traditional sanitation truck during use, and even under the condition that the operation habit of a driver is difficult to change, misoperation is easy to occur. The load-sensitive hydraulic system adopted in the embodiment well solves the problem, and comprises a variable displacement plunger pump, a multi-way reversing valve 9, a hydraulic motor, a hydraulic oil tank, a pipeline and the like. During operation, the chassis engine 2 can meet the power required by operation by keeping idling. When the rotating speed of the chassis engine 2 is unchanged, the rotating speed of the variable plunger pump is unchanged, the output pressure and flow are unchanged, and the rotating speeds of the fan 11 and the second water pump 12 are unchanged, namely the operation effect of the upper operating device 15 is constant; when a driver steps on an accelerator to increase the rotating speed of the chassis engine 2, the variable plunger pump outputs larger flow instantly, and at the moment, because the opening degree of a valve port of the multi-way reversing valve 9 is not changed, according to a throttle valve flow formula:
Figure BDA0003670817650000071
wherein:
q is the flow passing through the valve ports of the multi-way reversing valve 9;
C d is a flow coefficient, is a constant;
A 0 the sectional area of the valve port of the multi-way reversing valve 9 is constant after the valve is selected;
delta p is the pressure difference between the front and the back of the valve port of the multi-way reversing valve 9;
rho is the hydraulic oil density and is a constant.
It can be known from the formula (1) that the pressure difference before and after the valve port of the multi-way directional valve 9 is proportional to the flow passing through, therefore, when the rotation speed of the chassis engine 2 increases to increase the flow of the variable displacement piston pump, the pressure difference before and after the valve port of the multi-way directional valve 9 increases, and as the displacement of the variable displacement piston pump is controlled by the pressure difference before and after the valve port of the multi-way directional valve 9, after the pressure difference increases, the increased pressure difference acts on the swash plate of the variable displacement piston pump through the oil path to reduce the inclination angle of the swash plate, so that the displacement of the variable displacement piston pump decreases instantaneously, and the output flow decreases to reduce the pressure difference before and after the valve port of the multi-way directional valve 9, until the pressure difference before and after the valve port returns to the original set range value, that is, the output flow also returns to the original size, thereby maintaining the fan motor 10, the water pump motor 13, the fan motor 9, the multi-way valve control 9 connected to, The rotating speeds of the fan 11 and the second water pump 12 are unchanged, so that the purpose of keeping the operation effect of the upper operation device 15 constant is achieved. Conversely, when the rotation speed of the chassis engine 2 is reduced, the variable displacement piston pump outputs a small flow instantly, the pressure difference between the front and the back of the valve port of the multi-way directional valve 9 becomes small instantly, the reduced pressure difference acts on the swash plate of the variable displacement piston pump to increase the inclination angle of the swash plate, so that the displacement of the variable displacement piston pump is increased instantly, and the output flow increases to increase the pressure difference between the front and the back of the valve port of the multi-way directional valve 9 in turn, until the pressure difference between the front and the back of the valve port returns to the original set range value again, i.e. the output flow also returns to the original value, so that the rotation speeds of the fan motor 10, the water pump motor 13, the fan 11 and the second water pump 12 connected to the multi-way valve control 9 are maintained unchanged, and the purpose of keeping the operation effect of the upper operation device 15 constant is achieved.
Therefore, in the embodiment, no matter the rotating speed of the chassis engine 2 is increased or reduced, the load sensitive hydraulic system of the embodiment can automatically maintain the constant operation effect of the loading operation device 15, skillfully solves the problem that the loading operation device 15 of the single-engine sanitation truck is easy to cause unstable operation due to the rotating speed fluctuation of the chassis engine 2, and does not need to change the driving habit of a driver.
In the above embodiment, the electronic control system 1 controls the separation type power takeoff 5 and the multi-way reversing valve 9 to perform corresponding actions and eliminate load impact according to the clutch state of the clutch 14, specifically including:
when the operation starts, the electric control system 1 receives the engaging signal of the clutch 14, controls the combination of the separating power takeoff 5, and gradually opens the valve port of the multi-way directional control valve 9 to a preset opening degree according to a set speed, so that the rotating speed of the hydraulic motor is gradually increased to the working rotating speed to start the normal operation of the loading operation device 15.
When a gear shift is required, the electronic control system 1 controls the separation type power take-off 5 and the multi-way directional control valve 9 to perform corresponding actions and eliminate load impact according to the clutch state of the clutch 14, and specifically comprises:
before gear shifting, when a pedal is stepped on to enable the clutch 14 to be disengaged, after the electronic control system 1 receives a clutch disengagement signal, the separated power takeoff 5 is controlled to be separated, the valve port of the multi-way reversing valve 9 is closed in real time, and the hydraulic motor stops rotating to suspend the operation of the loading operation device 15;
after the gear shifting is finished, when the pedal is released by foot to engage the clutch 14, after the electronic control system 1 receives a clutch engagement signal, the separated power takeoff 5 is controlled to be combined, the valve port of the multi-way reversing valve 9 is gradually opened to a preset opening degree according to a set speed, and the rotating speed of the hydraulic motor is gradually increased to a working rotating speed to recover the normal operation of the upper-mounted operation device 15.
The following is a detailed description of the principle of how the above-described embodiment eliminates the impact on the engine and transmission components from the unloading to loading processes of the engine:
when the impact of the unloading to loading process of the engine on the engine and the transmission components is eliminated, if the four technologies of single-engine power matching technology, traveling gear shifting, power decoupling and load sensitivity are combined together and the impact of the unloading to loading process of the chassis engine 2 on the chassis engine 2 and the transmission components is not considered, the service life of the transmission components related to the method is greatly shortened, and the method is very uneconomical and not advisable. Because the power consumed by the upper working device 15 during working is large, in the starting process of the device, the flexible loading is generally adopted, that is, the rotating speed of each hydraulic motor is slowly increased to the working rotating speed, rather than being in place in one step.
Therefore, as shown in fig. 2, at the beginning of the operation, the split power takeoff 5 is in gear and drives the variable plunger pump to rotate through the separation box 6, and the variable plunger pump outputs flow and pressure; then the electric control system 1 controls the valve port of the multi-way reversing valve 9 to be gradually and slowly opened according to a set speed through current, at the moment, the rotating speeds of the fan motor 10 and the fan 11 slowly rise to the working rotating speed to start normal operation, flexible loading is realized, the opening degree of the valve port of the multi-way reversing valve 9 is not quickly opened from zero to the working opening degree, and the process can eliminate impact of the load on each transmission part.
In the operation process, as shown in fig. 3, when a driver steps on a clutch pedal, the upper load overcomes inertia of forward driving of a vehicle, which causes a phenomenon similar to sudden braking, causes gear shifting difficulty, impact and even failure, greatly reduces the service life of a separating power takeoff 5 and a transmission 3, and can cause safety accidents in severe cases, so that after the electric control system 1 receives a clutch disengagement signal, the separating power takeoff 5 is controlled to separate and close a valve port of the multi-way directional valve 9 in real time, after the separating power takeoff 5 is disengaged, the variable plunger pump stops working, and simultaneously the valve port of the multi-way directional valve 9 is quickly closed, at the same time, the fan motor 10 and the water pump motor 13 lose power, and slowly stop running under the action of inertia, and because the separating power takeoff 5 is disengaged and the valve port of the multi-way directional valve 9 is quickly closed, at the upper load cannot be sequentially transmitted to the separating power takeoff 5, the multi-way directional valve 9 through a hydraulic system, The gearbox 3 and the rear axle 4 eliminate the back-dragging effect of the upper load; in addition, in the real-time process, an oil supplementing one-way valve can be arranged in the hydraulic system, so that the fan motor 10 and the water pump motor 13 can be prevented from being sucked to be empty, motor parts are protected, the fan motor 10 and the water pump motor 13 can be controlled to overcome inertia, and the rotating speed slowly drops to zero.
After a driver releases a clutch pedal, the electronic control system 1 receives a clutch engagement signal to control the split power takeoff 5 to be re-engaged, the variable plunger pump resumes operation, at this time, because the valve port of the multi-way directional valve 9 is closed, it is ensured that the split power takeoff 5 and the variable plunger pump start without load or with a small load, then the electronic control system 1 controls the valve port of the multi-way directional valve 9 to be opened to a predetermined opening degree step by step according to a set speed, the rotating speeds of the fan motor 10 and the water pump motor 13 slowly rise to a working rotating speed to resume normal operation, because the embodiment does not move the opening degree of the valve port from zero to the working opening degree quickly, impact of the load on each transmission part can be eliminated, and the operation of the transmission parts is ensured within a normal working condition range to the utmost extent.
In summary, the above embodiment ensures the operation effect of single-shot loading through the electric and hydraulic combined control system, eliminates the impact on the transmission components such as the chassis engine 2, the gearbox 3, the split power takeoff 5 and the like during the process of shifting gears from loading to unloading during operation and reloading, and greatly improves the reliability and durability of the components; according to the embodiment, the rotating speed of the chassis engine 2 does not need to be controlled to be constant during operation, if gear shifting is needed in the vehicle running operation process, the gear shifting can be carried out according to the conventional habit, the driving habit of a driver cannot be changed, the phenomenon of misoperation is greatly reduced, the safety of road cleaning work is ensured, the impact phenomenon is avoided, and the service lives of products and parts are greatly prolonged.
In another preferred embodiment of the present invention, as shown in fig. 4, the multiple directional control valve 9 and the flow rate adjustment device of the variable pump 7 are electrically connected to the electronic control system 1, and the electronic control system 1 is further configured to send a command to the flow rate adjustment device of the variable pump 7 according to the collected hydraulic oil pressure difference at the valve port of the multiple directional control valve 9, and control the flow rate adjustment device of the variable pump 7 to correspondingly adjust the displacement of the variable pump 7 to be maintained within a set range of values.
Specifically, when the collected hydraulic oil pressure difference of the valve ports of the multi-way reversing valve 9 is greater than a set range value, the electronic control system 1 sends an instruction to the flow regulating device of the variable pump 7, and controls the flow regulating device of the variable pump 7 to continuously reduce the displacement of the variable pump 7 until the displacement is within the set range value;
when the collected hydraulic oil pressure difference of the valve port of the multi-way reversing valve 9 is smaller than a set range value, the electronic control system 1 sends an instruction to the flow regulating device of the variable pump 7, and controls the flow regulating device of the variable pump 7 to continuously increase the displacement of the variable pump 7 until the displacement is within the set range value.
Different from the previous embodiment, this embodiment is to control the flow rate adjusting device of the variable pump 7 to correspondingly adjust the displacement of the variable pump 7 to be maintained within a set range value by sending a command to the flow rate adjusting device of the variable pump 7 through the electronic control system 1 according to the collected hydraulic oil pressure difference at the valve port of the multi-way directional valve 9, and belongs to an electrical feedback control, rather than the hydraulic feedback control of the previous embodiment.
The embodiment of this application another aspect still provides a sanitation car, sanitation car includes the single-shot transmission and the control system of elimination load impact, the sanitation car includes city road cleaning vehicles such as sweeping machine, washing and sweeping car, cleaning cart, multi-functional dust suppression car, hedgerow trimmer.
The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. A single-shot transmission and control system for eliminating load impact comprises a chassis engine (2), a clutch (14) and a gearbox (3), and is characterized by further comprising:
the split power takeoff (5) is in driving connection with the gearbox (3) to obtain power;
the input end of the transfer case (6) is in driving connection with the output end of the separated power takeoff (5);
the power input end of the variable pump (7) is in driving connection with the corresponding output end of the transfer case (6), and a flow regulating device of the variable pump (7) automatically maintains the displacement of the variable pump (7) within a set range value according to the pressure difference change of a valve port of the multi-way reversing valve (9);
the hydraulic input end of the multi-way reversing valve (9) is connected with the hydraulic output end pipeline of the variable pump (7), and the hydraulic output end of the multi-way reversing valve (9) is connected with the hydraulic motor pipeline connected with the upper-mounted operation device (15);
and the electric control system (1) is respectively electrically connected with the separated power takeoff (5), the transfer case (6) and the multi-way reversing valve (9) and is used for controlling the output of the transfer case (6) and controlling the separated power takeoff (5) and the multi-way reversing valve (9) to execute corresponding actions and eliminate load impact according to the clutch state of the clutch (14).
2. The single-shot load impact cancellation transmission and control system according to claim 1, wherein the split power take-off is (5) a separable friction power take-off.
3. The single-shot transmission and control system for eliminating load shock as claimed in claim 1, wherein said variable displacement pump (7) is a variable displacement plunger pump or a variable displacement vane pump.
4. The single-shot transmission and control system for eliminating load impact as recited in claim 1, wherein the multi-way directional control valve (9) is connected with the flow regulating device of the variable pump (7) through an oil path, and when the hydraulic oil pressure difference at the valve port of the multi-way directional control valve (9) exceeds a set range value, the multi-way directional control valve (9) drives the flow regulating device of the variable pump (7) through the pressure oil to correspondingly regulate the displacement of the variable pump (7) to be maintained within the set range value.
5. The single-shot transmission and control system that eliminates load shocks as recited in claim 4,
when the hydraulic oil pressure difference of the valve port of the multi-way directional valve (9) is larger than a set range value, the multi-way directional valve (9) drives the flow regulating device of the variable pump (7) to continuously reduce the displacement of the variable pump (7) until the displacement is within the set range value through pressure oil;
when the hydraulic oil pressure difference of the valve port of the multi-way directional valve (9) is less than the set range value, the multi-way directional valve (9) drives the flow regulating device of the variable pump (7) through pressure oil to continuously increase the displacement of the variable pump (7) until the displacement is within the set range value.
6. The single-shot transmission and control system that eliminates load shocks as recited in claim 1,
the multi-way reversing valve (9) and the flow regulating device of the variable pump (7) are electrically connected with the electric control system (1), and the electric control system (1) is further used for sending an instruction to the flow regulating device of the variable pump (7) according to the collected hydraulic oil pressure difference of the valve port of the multi-way reversing valve (9) and controlling the flow regulating device of the variable pump (7) to correspondingly regulate the displacement of the variable pump (7) to be maintained within a set range value.
7. The single-shot transmission and control system that eliminates load shocks of claim 6,
when the collected hydraulic oil pressure difference of the valve port of the multi-way reversing valve (9) is larger than a set range value, the electric control system (1) sends an instruction to the flow regulating device of the variable pump (7) to control the flow regulating device of the variable pump (7) to continuously reduce the displacement of the variable pump (7) until the displacement is within the set range value;
when the collected hydraulic oil pressure difference of the valve port of the multi-way reversing valve (9) is smaller than a set range value, the electronic control system (1) sends an instruction to the flow regulating device of the variable pump (7) to control the flow regulating device of the variable pump (7) to continuously increase the displacement of the variable pump (7) until the displacement is within the set range value.
8. The single-shot transmission and control system for eliminating load shock according to claim 1, wherein the electronic control system (1) controls the split power take-off (5) and the multi-way reversing valve (9) to perform corresponding actions and eliminate load shock according to the clutch state of the clutch (14), and specifically comprises:
when the operation is started, the electric control system (1) receives an engagement signal of the clutch (14), controls the combination of the separated power takeoff (5), and enables the valve port of the multi-way reversing valve (9) to be opened to a preset opening degree step by step according to a set speed, so that the rotating speed of the hydraulic motor is increased to a working rotating speed step by step to start the normal operation of the loading operation device (15).
9. The single-shot transmission and control system for eliminating load shock according to any one of claims 1 to 8, wherein the electronic control system (1) controls the split power take-off (5) and the multi-way directional control valve (9) to perform corresponding actions and eliminate load shock according to the clutch state of the clutch (14), and specifically comprises:
before gear shifting, when a pedal is stepped to enable a clutch (14) to be disengaged, after the electric control system (1) receives a clutch disengagement signal, the separated power takeoff (5) is controlled to be separated, a valve port of the multi-way reversing valve (9) is closed in real time, and the hydraulic motor stops rotating to suspend the operation of the loading operation device (15);
after gear shifting is finished, when a pedal is released by a foot to enable a clutch (14) to be engaged, after the electronic control system (1) receives a clutch engagement signal, the separated power takeoff (5) is controlled to be combined, a valve port of the multi-way reversing valve (9) is opened to a preset opening degree step by step according to a set speed, and the rotating speed of the hydraulic motor is increased step by step to the working rotating speed to restore normal operation of the loading operation device (15).
10. A sanitation truck comprising a single-shot transmission and control system for dissipating load shocks as claimed in any one of claims 1 to 9.
CN202210607045.XA 2022-04-15 2022-05-31 Single-shot transmission and control system for eliminating load impact and sanitation vehicle Pending CN114987197A (en)

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CN202210397457 2022-04-15
CN2022103974575 2022-04-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115962278A (en) * 2022-11-28 2023-04-14 福龙马集团股份有限公司 Single-engine sanitation vehicle on-load gear shifting buffer device and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115962278A (en) * 2022-11-28 2023-04-14 福龙马集团股份有限公司 Single-engine sanitation vehicle on-load gear shifting buffer device and control method thereof

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