CN112622599A - Mechanical-hydraulic transmission system, mode switching control method thereof and engineering machinery - Google Patents
Mechanical-hydraulic transmission system, mode switching control method thereof and engineering machinery Download PDFInfo
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- CN112622599A CN112622599A CN202011577974.8A CN202011577974A CN112622599A CN 112622599 A CN112622599 A CN 112622599A CN 202011577974 A CN202011577974 A CN 202011577974A CN 112622599 A CN112622599 A CN 112622599A
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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
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units
- B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
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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
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
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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
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of fluid gearing
- B60K17/105—Units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles
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Abstract
The invention relates to the technical field of hydraulic systems, in particular to a mechanical-hydraulic transmission system, a mode switching control method thereof and an engineering machine, wherein the transmission system comprises two first position sensors, two second position sensors and a main controller, wherein the two first position sensors are respectively used for detecting whether a power input wheel is meshed with a mechanical input wheel or not and whether the power input wheel is meshed with a hydraulic input wheel or not; the two second position sensors are respectively used for detecting whether the power output wheel is meshed with the mechanical output wheel or not and whether the power output wheel is meshed with the hydraulic output wheel or not; the first position sensor and the second position sensor are both in communication connection with the main controller, and the main controller is in control connection with the hydraulic pump. According to the invention, whether the system mode is successfully switched can be judged through the first position sensor and the second position sensor; and can carry out override control to the hydraulic pump when the gear card is dead to solve the gear card problem.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a mechanical-hydraulic transmission system, a mode switching control method thereof and an engineering machine.
Background
The hydraulic transmission has the advantages of convenient arrangement, high power density, no influence of input rotating speed on output torque and rotating speed, easy realization of stepless speed regulation and automatic control, and the like, but has the defects of low transmission efficiency and the like. The defect of low transmission efficiency is more prominent particularly under the high-speed and low-speed transmission working conditions. The gear mechanical transmission has the advantages of accurate and reliable transmission motion, constant instantaneous transmission ratio, compact structure, capability of realizing larger transmission ratio, high transmission power, high transmission efficiency and the like, but automatic speed change is difficult to realize, and stepless speed change is more difficult to realize. When the medium and large-sized engineering machinery works, a transmission system is often required to transmit larger power, high-efficiency speed and torque conversion can be carried out on a power source according to the working condition and the load change, the requirement of the medium and large-sized engineering machinery on the transmission system is difficult to be perfectly met by single mechanical transmission or hydraulic transmission, and the advantages of a hybrid power system are more and more prominent. The whole vehicle is provided with a hybrid power configuration, so that smooth switching between a mechanical mode and a hydraulic mode is required, but in specific practice, the mode switching is often locked.
Disclosure of Invention
The invention aims to provide a mechanical-hydraulic transmission system, a mode switching control method thereof and an engineering machine, so as to solve the problem that the mode switching is easy to block in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mechanical-hydraulic transmission system comprises a mode switching switch, a power input wheel, a mechanical output wheel, a hydraulic input wheel, a hydraulic output wheel and a power output wheel, wherein the mechanical input wheel is connected with the mechanical output wheel through a mechanical transmission shaft, the hydraulic input wheel is in driving connection with a hydraulic pump, a high-pressure port of the hydraulic pump is communicated with an oil inlet of a hydraulic motor, and a low-pressure port of the hydraulic pump is communicated with an oil outlet of the hydraulic motor; the mode selector switch is capable of switching the mechanical-hydraulic transmission system between a mechanical transmission mode and a hydraulic transmission mode, when the mechanical-hydraulic transmission system is in the mechanical transmission mode, the power input wheel is engaged with the mechanical input wheel, and the power output wheel is engaged with the mechanical output wheel; when the mechanical-hydraulic transmission system is in a hydraulic transmission mode, the power input wheel is meshed with the hydraulic input wheel, and the power output wheel is meshed with the hydraulic output wheel;
the mechanical-hydraulic transmission system further comprises two first position sensors, a second position sensor and a main controller, wherein the two first position sensors are respectively used for detecting whether the power input wheel and the mechanical input wheel are meshed or not and whether the power input wheel and the hydraulic input wheel are meshed or not; the number of the second position sensors is two, and the two second position sensors are respectively used for detecting whether the power output wheel is meshed with the mechanical output wheel or not and the power output wheel is meshed with the hydraulic output wheel or not; the first position sensor and the second position sensor are in communication connection with the main controller, and the main controller is in control connection with the hydraulic pump.
Preferably, a first air valve is arranged at the power input wheel, and the first air valve can enable the power input wheel to be selectively meshed with the mechanical input wheel or the hydraulic input wheel; a second air valve is arranged at the power output wheel and can enable the power output wheel to be selectively meshed with the mechanical output wheel or the hydraulic output wheel; the first air valve and the second air valve are both in control connection with the main controller.
Preferably, the power of the power input wheel is provided by an engine, and the clutch can cut off or conduct the power transmitted to the power input wheel by the engine.
A mode switching control method applied to the mechanical-hydraulic transmission system is characterized in that after the main controller controls the mechanical-hydraulic transmission system to be switched from a hydraulic transmission mode to a mechanical transmission mode, if a signal that the power input wheel and the mechanical input wheel are meshed in place and a signal that the power output wheel and the mechanical output wheel are not meshed in place and input by a first position sensor at the mechanical input wheel are received at the same time, the displacement of the hydraulic pump is controlled to be increased from the minimum value to a preset value.
Preferably, after the main controller controls the displacement of the hydraulic pump to increase from the minimum value to the preset value, the main controller detects whether the mechanical-hydraulic transmission system is successfully switched from the hydraulic transmission mode to the mechanical transmission mode in real time, and when the mechanical-hydraulic transmission system is successfully switched from the hydraulic transmission mode to the mechanical transmission mode, the main controller controls the displacement of the hydraulic pump to decrease from the preset value to the minimum value again.
Preferably, when the main controller receives a mode switching command, it first detects whether the mechanical-hydraulic transmission system has a mode switching condition, and when it detects that the mechanical-hydraulic transmission system has the mode switching condition, it controls the mechanical-hydraulic transmission system to perform mode switching.
Preferably, the mode switching conditions include the engine being in an idle condition, the clutch being in a disengaged state, the vehicle speed being zero, and the brake being enabled.
Preferably, the signal that the engine is in the idle condition is originated from engine CAN communication, the signal that the clutch is in the disengagement state is originated from a clutch state sensor, and the signal that the vehicle speed is zero and the signal that the brake is enabled are originated from chassis controller CAN communication.
Preferably, the main controller detects the states of the first position sensor and the second position sensor in real time after controlling the mechanical-hydraulic transmission system to perform mode switching so as to judge whether the mode switching is successful.
A construction machine employing the mode switching control method as defined in any one of the above.
The invention has the beneficial effects that:
the invention provides a mechanical-hydraulic transmission system, which is additionally provided with a first position sensor, a second position sensor and a main controller in communication connection with the first position sensor and the second position sensor, and can judge whether the system mode is successfully switched or not through the first position sensor and the second position sensor; and the main controller is also connected with the hydraulic pump control, and can override the hydraulic pump when the gear is locked to solve the problem of gear locking.
The invention further provides a mode switching control method of the mechanical-hydraulic transmission system, when the main controller receives a signal that the power input wheel and the mechanical input wheel are meshed in place and input by the first position sensor at the mechanical input wheel after controlling the mechanical-hydraulic transmission system to be switched from the hydraulic transmission mode to the mechanical transmission mode, and simultaneously receives a signal that the mechanical output wheel and the power output wheel are not meshed in place and input by the second position sensor at the mechanical output wheel, the displacement of the hydraulic pump is controlled to be increased from the minimum value to the preset value. The displacement of the hydraulic pump is controlled to be increased from the minimum value to the preset value, a hydraulic circuit between the hydraulic pump and the hydraulic motor is dredged, and the hydraulic motor recovers rotation, so that the meshing force between the hydraulic output wheel and the power output wheel is released, and the mode switching is ensured to be successful.
Drawings
FIG. 1 is a schematic illustration of a mechanical-hydraulic drive system provided by an embodiment of the present invention;
fig. 2 is a flowchart illustrating a mode switching control method according to an embodiment of the present invention.
In the figure:
1. an engine; 2. a power input wheel; 3. a clutch; 4. a mechanical input wheel; 5. a mechanical drive shaft; 6. a mechanical output wheel; 7. a hydraulic input wheel; 8. a hydraulic pump; 9. a hydraulic motor; 10. a hydraulic output wheel; 11. a power take-off wheel; 12. a drive axle; 13. a first air valve; 14. a second air valve; 15. a first position sensor; 16. a second position sensor; 17. a main controller; 18. a mode changeover switch; 19. a chassis controller.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present invention provides a mechanical-hydraulic transmission system, which comprises a mode switch 18, a power input wheel 2, a mechanical input wheel 4, a mechanical output wheel 6, a hydraulic input wheel 7, a hydraulic output wheel 10 and a power output wheel 11, wherein an engine 1 is in driving connection with the power input wheel 2, and a clutch 3 can cut off or conduct the power transmitted from the engine 1 to the power input wheel 2; the power output wheel 11 is connected with a drive axle 12; the mechanical input wheel 4 is connected with the mechanical output wheel 6 through a mechanical transmission shaft 5, the hydraulic input wheel 7 is in driving connection with a hydraulic pump 8, a high-pressure port of the hydraulic pump 8 is communicated with an oil inlet of a hydraulic motor 9, and a low-pressure port of the hydraulic pump 8 is communicated with an oil outlet of the hydraulic motor 9; the mode changeover switch 18 enables the mechanical-hydraulic transmission system to be switched between a mechanical transmission mode in which the power input wheel 2 is engaged with the mechanical input wheel 4 and the power output wheel 11 is engaged with the mechanical output wheel 6, and a hydraulic transmission mode in which the mechanical-hydraulic transmission system is engaged with the hydraulic input wheel 7 and the power output wheel 11 is engaged with the hydraulic output wheel 10.
The mechanical-hydraulic transmission system further comprises a first air valve 13 and a second air valve 14, wherein the first air valve 13 is arranged at the power input wheel 2, the first air valve 13 can enable the power input wheel 2 to be selectively meshed with the mechanical input wheel 4 or the hydraulic input wheel 7, the second air valve 14 is arranged at the power wheel output wheel, the second air valve 14 can enable the power output wheel 11 to be selectively meshed with the mechanical output wheel 6 or the hydraulic output wheel 10, and the first air valve 13 and the second air valve 14 are connected with the main controller 17 in a control mode. The main controller 17 can make the power input wheel 2 and the mechanical input wheel 4 separated and engaged with the hydraulic input wheel 7 by controlling the first air valve 13 to be opened, and the main controller 17 can make the power output wheel 11 and the mechanical output wheel 6 separated and engaged with the hydraulic output wheel 10 by controlling the second air valve 14 to be opened, namely, the first air valve 13 is firstly controlled to be opened, then the second air valve 14 is controlled to be opened, so that the mechanical-hydraulic transmission system can be switched from a mechanical transmission mode to a hydraulic transmission mode. The main controller 17 can make the power input wheel 2 disengaged from the hydraulic input wheel 7 and engaged with the mechanical input wheel 4 by controlling the first air valve 13 to be closed, and can make the power output wheel 11 disengaged from the hydraulic output wheel 10 and engaged with the mechanical output wheel 6 by controlling the second air valve 14 to be closed, namely, the first air valve 13 is controlled to be closed first, then the second air valve 14 is controlled to be closed, so that the mechanical-hydraulic transmission system can be switched from a hydraulic transmission mode to a mechanical transmission mode.
The mechanical-hydraulic transmission system further comprises two first position sensors 15 and two second position sensors 16, the number of the first position sensors 15 is two, the two first position sensors 15 are respectively positioned at the mechanical input wheel 4 and the hydraulic input wheel 7, and the two first position sensors 15 are respectively used for detecting whether the power input wheel 2 is meshed with the mechanical input wheel 4 or not and the power input wheel 2 is meshed with the hydraulic input wheel 7 or not; the number of the second position sensors 16 is two, the two second position sensors 16 are respectively located at the mechanical output wheel 6 and the hydraulic output wheel 10, the two second position sensors 16 are respectively used for detecting whether the power output wheel 11 is meshed with the mechanical output wheel 6 or not and the power output wheel 11 is meshed with the hydraulic output wheel 10, and the first position sensor 15 and the second position sensor 16 are both in communication connection with the main controller. When the mechanical-hydraulic transmission system is switched between modes, the first position sensor 15 and the second position sensor 16 are used for detecting whether the corresponding gears are meshed in place after the modes are switched, and the detection is also used for judging that the gears are locked.
Specifically, the above determination relates to six types of gear seizure (the first three of which are failures that occur when switching from the mechanical transmission mode to the hydraulic transmission mode, and the last three of which are failures that occur when switching from the hydraulic transmission mode to the mechanical transmission mode):
1) when the mechanical-hydraulic transmission system is switched from a mechanical transmission mode to a hydraulic transmission mode, the first position sensor 15 located at the hydraulic input wheel 7 detects that the hydraulic input wheel 7 and the power input wheel 2 are not meshed in place, and the second position sensor 16 located at the hydraulic output wheel 10 detects that the hydraulic output wheel 10 and the power output wheel 11 are not meshed in place, so that the input power wheel and the output power wheel are blocked at the same time.
2) When the mechanical-hydraulic transmission system is switched from a mechanical transmission mode to a hydraulic transmission mode, the first position sensor 15 at the hydraulic input wheel 7 detects that the hydraulic input wheel 7 and the power input wheel 2 are not meshed in place, but the second position sensor 16 at the hydraulic output wheel 10 detects that the hydraulic output wheel 10 and the power output wheel 11 are meshed in place, and the input power wheel is blocked.
3) When the mechanical-hydraulic transmission system is switched from the mechanical transmission mode to the hydraulic transmission mode, the first position sensor 15 at the hydraulic input wheel 7 detects that the hydraulic input wheel 7 and the power input wheel 2 are meshed in place, but the second position sensor 16 at the hydraulic output wheel 10 detects that the hydraulic output wheel 10 and the power output wheel 11 are not meshed in place, and the output power wheel is blocked.
4) When the mechanical-hydraulic transmission system is switched from the hydraulic transmission mode to the mechanical transmission mode, the first position sensor 15 located at the mechanical input wheel 4 detects that the mechanical input wheel 4 and the power input wheel 2 are not meshed in place, and the second position sensor 16 located at the mechanical output wheel 6 detects that the mechanical output wheel 6 and the power output wheel 11 are not meshed in place, so that the input power wheel and the output power wheel are blocked at the same time.
5) When the mechanical-hydraulic transmission system is switched from the hydraulic transmission mode to the mechanical transmission mode, the first position sensor 15 located at the mechanical input wheel 4 detects that the mechanical input wheel 4 and the power input wheel 2 are not meshed in place, but the second position sensor 16 located at the mechanical output wheel 6 detects that the mechanical output wheel 6 and the power output wheel 11 are meshed in place, and the input power wheel is blocked.
6) When the mechanical-hydraulic transmission system is switched from the hydraulic transmission mode to the mechanical transmission mode, the first position sensor 15 located at the mechanical input wheel 4 detects that the mechanical input wheel 4 and the power input wheel 2 are meshed in place, but the second position sensor 16 located at the mechanical output wheel 6 detects that the mechanical output wheel 6 and the power output wheel 11 are not meshed in place, and the output power wheel is blocked.
The first five gear locking forms are caused by the fact that the clutch 3 is not disengaged, only the clutch 3 is ensured to be in a disengaged position in the mode switching process, clutch disengagement failure is a common fault form, the processing method is the prior art, and details are not repeated. For the sixth failure mode, tests and analysis show that the reason for the switching failure is that the meshing force between the hydraulic output wheel 10 and the power output wheel 11 is too large, the reason for the large meshing force is that the braking state is enabled at the moment of mode switching, the displacement of the hydraulic pump 8 is quickly reduced to the minimum value, and due to the inertia of the whole vehicle, the tire can drive the power output wheel 11 to continue rotating, at this moment, the power output wheel 11 and the hydraulic output wheel 10 continue to be meshed, so that the hydraulic motor 9 drags the hydraulic pump 8 backwards, and because the displacement of the hydraulic pump 8 is at the minimum value, the original low-pressure side is subjected to high pressure and cannot be released. As long as there is a high pressure side in the hydraulic circuit, the hydraulic output wheel 10 is pushed into tight engagement with the power output wheel 11, resulting in a shift failure.
As shown in fig. 2, the present invention provides a mode switching control method for the sixth gear locking mode, so as to control and connect the main controller 17 and the hydraulic pump 8, wherein the mode switching control method comprises the following steps:
s10, the main controller 17 receives the switching command from the mode switching switch 18.
The switching command includes a command to switch from the mechanical transmission mode to the hydraulic transmission mode, and a command to switch from the hydraulic transmission mode to the mechanical transmission mode.
And S20, judging that the mechanical-hydraulic transmission system has the condition of mode switching currently.
The mode switching conditions include that the engine 1 is in an idle condition, the clutch 3 is in a disengaged state, the vehicle speed is zero, and braking is enabled. Wherein, the signal that engine 1 is in idle operating mode stems from engine 1CAN communication, and the signal that clutch 3 is in the disengagement state stems from clutch 3 state sensor, and the signal that the speed of a motor vehicle is zero and the signal that the brake enables stem from chassis controller 19CAN communication.
And S30, controlling the mechanical-hydraulic transmission system to switch modes.
Specifically, if the switching instruction is to switch from the mechanical transmission mode to the hydraulic transmission mode, the main controller 17 controls the first air valve 13 to open first, and then controls the second air valve 14 to open; if the switching command is to switch from the hydraulic transmission mode to the mechanical transmission mode, the main controller 17 controls the first air valve 13 to close first, and then controls the second air valve 14 to close second.
S40, detecting the states of the first position sensor 15 and the second position sensor 16.
By detecting the states of the first position sensor 15 and the second position sensor 16, it can be determined whether the mode switching is successful.
S50, after controlling the mechanical-hydraulic transmission system to switch from the hydraulic transmission mode to the mechanical transmission mode, the main controller 17 receives a signal that the power input wheel 2 and the mechanical input wheel 4 are engaged in place from the first position sensor 15 at the mechanical input wheel 4, and simultaneously receives a signal that the power output wheel 6 and the power output wheel 11 are not engaged in place from the second position sensor 16 at the mechanical output wheel 6.
When the above situation occurs, it is explained that the power output wheel 11 is locked when the hydraulic transmission mode is switched to the mechanical transmission mode, that is, the sixth gear locking form is described above.
And S60, controlling the displacement of the hydraulic pump 8 to increase from the minimum value to a preset value.
The displacement of the hydraulic pump 8 is controlled to be increased from the minimum value to the preset value, a hydraulic circuit between the hydraulic pump 8 and the hydraulic motor 9 is dredged, the hydraulic motor 9 recovers rotation, and the engagement force between the hydraulic output wheel 10 and the power output wheel 11 is released in a mode that the hydraulic pump 8 is reversely dragged by the hydraulic motor 9, so that the mode switching success is ensured.
S70, after the main controller 17 detects that the mechanical-hydraulic transmission system is successfully switched from the hydraulic transmission mode to the mechanical transmission mode, the main controller controls the displacement of the hydraulic pump 8 to be decreased from the preset value to the minimum value again.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A mechanical-hydraulic transmission system comprises a mode switching switch (18), a power input wheel (2), a mechanical input wheel (4), a mechanical output wheel (6), a hydraulic input wheel (7), a hydraulic output wheel (10) and a power output wheel (11), wherein the mechanical input wheel (4) is connected with the mechanical output wheel (6) through a mechanical transmission shaft (5), the hydraulic input wheel (7) is in driving connection with a hydraulic pump (8), a high-pressure port of the hydraulic pump (8) is communicated with an oil inlet of a hydraulic motor (9), and a low-pressure port of the hydraulic pump (8) is communicated with an oil outlet of the hydraulic motor (9); the mode switch (18) can switch the mechanical-hydraulic transmission system between a mechanical transmission mode and a hydraulic transmission mode, when the mechanical-hydraulic transmission system is in the mechanical transmission mode, the power input wheel (2) is meshed with the mechanical input wheel (4), and the power output wheel (11) is meshed with the mechanical output wheel (6); when the mechanical-hydraulic transmission system is in a hydraulic transmission mode, the power input wheel (2) is meshed with the hydraulic input wheel (7), and the power output wheel (11) is meshed with the hydraulic output wheel (10);
the mechanical-hydraulic transmission system is characterized by further comprising two first position sensors (15), two second position sensors (16) and a main controller (17), wherein the two first position sensors (15) are respectively used for detecting whether the power input wheel (2) is meshed with the mechanical input wheel (4) or not and whether the power input wheel (2) is meshed with the hydraulic input wheel (7) or not; the number of the second position sensors (16) is two, and the two second position sensors (16) are respectively used for detecting whether the power output wheel (11) is meshed with the mechanical output wheel (6) or not and whether the power output wheel (11) is meshed with the hydraulic output wheel (10) or not; the first position sensor (15) and the second position sensor (16) are in communication connection with the main controller (17), and the main controller (17) is in control connection with the hydraulic pump (8).
2. The mechanical-hydraulic transmission system according to claim 1, characterized in that a first gas valve (13) is arranged at the power input wheel (2), and the first gas valve (13) can enable the power input wheel (2) to be selectively meshed with the mechanical input wheel (4) or the hydraulic input wheel (7); a second air valve (14) is arranged at the power output wheel (11), and the second air valve (14) can enable the power output wheel (11) to be selectively meshed with the mechanical output wheel (6) or the hydraulic output wheel (10); the first air valve (13) and the second air valve (14) are in control connection with the main controller (17).
3. The mechanical-hydraulic transmission system according to claim 1, characterized in that the power of the power input wheel (2) is provided by an engine (1), and the clutch (3) can cut off or conduct the power transmitted from the engine (1) to the power input wheel (2).
4. A mode switching control method applied to a mechanical-hydraulic transmission system according to any one of claims 1 to 3, characterized in that, when the main controller (17) receives a signal from a first position sensor (15) at the mechanical input wheel (4) that the power input wheel (2) and the mechanical input wheel (4) are engaged and simultaneously receives a signal from a second position sensor (16) at the mechanical output wheel (6) that the power output wheel (11) and the mechanical output wheel (6) are not engaged after controlling the mechanical-hydraulic transmission system to switch from the hydraulic transmission mode to the mechanical transmission mode, the displacement of the hydraulic pump (8) is controlled to be increased from a minimum value to a preset value.
5. The mode shift control method according to claim 4, characterized in that after the main controller (17) controls the displacement of the hydraulic pump (8) to increase from a minimum value to a preset value, the main controller (17) detects in real time whether the mechanical-hydraulic transmission system is successfully shifted from the hydraulic transmission mode to the mechanical transmission mode, and when detecting that the mechanical-hydraulic transmission system is successfully shifted from the hydraulic transmission mode to the mechanical transmission mode, controls the displacement of the hydraulic pump (8) to decrease again from the preset value to the minimum value.
6. The mode switching control method according to claim 4 or 5, characterized in that when the main controller (17) receives a mode switching instruction, it first detects whether the mechanical-hydraulic transmission system is in a mode switching condition, and when it detects that the mechanical-hydraulic transmission system is in the mode switching condition, it controls the mechanical-hydraulic transmission system to perform mode switching.
7. The mode switching control method according to claim 6, characterized in that the mode switching conditions include an engine (1) in an idle condition, a clutch (3) in a disengaged state, a vehicle speed of zero, and a brake enable.
8. Mode switch control method according to claim 7, characterized in that the signal that the engine (1) is in idle condition is derived from engine (1) CAN communication, the signal that the clutch (3) is in disengaged condition is derived from a clutch status sensor, the signal that the vehicle speed is zero and the signal that the brake is enabled is derived from chassis controller (19) CAN communication.
9. The mode switching control method according to claim 6, wherein the main controller (17) detects the states of the first position sensor (15) and the second position sensor (16) in real time after controlling the mechanical-hydraulic transmission system to perform the mode switching to determine whether the mode switching is successful.
10. A construction machine characterized by employing the mode switching control method according to any one of claims 4 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577974.8A CN112622599B (en) | 2020-12-28 | 2020-12-28 | Mechanical-hydraulic transmission system, mode switching control method thereof and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577974.8A CN112622599B (en) | 2020-12-28 | 2020-12-28 | Mechanical-hydraulic transmission system, mode switching control method thereof and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
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| CN112622599A true CN112622599A (en) | 2021-04-09 |
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