CN110978988A - Hybrid DCT tractor and automatic gear shifting control method thereof - Google Patents
Hybrid DCT tractor and automatic gear shifting control method thereof Download PDFInfo
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- CN110978988A CN110978988A CN202010038286.8A CN202010038286A CN110978988A CN 110978988 A CN110978988 A CN 110978988A CN 202010038286 A CN202010038286 A CN 202010038286A CN 110978988 A CN110978988 A CN 110978988A
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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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/36—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
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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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/38—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the driveline clutches
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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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/42—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
- B60K6/44—Series-parallel type
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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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—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 Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
- B60K6/54—Transmission for changing ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
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- 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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- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Transmission Device (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
A hybrid DCT tractor and its automatic gear shift control method, including driving the main input shaft for power input that links to the crankshaft of the engine, main output shaft to the partial output power of central drive, power take-off shaft PTO for the load output power, double clutch automatic speed changer, gear motor, power coupling device, central drive, drive the wheel hub; the double-clutch automatic transmission comprises a clutch shell in transmission connection with an output shaft of an engine, a clutch C1 for controlling heavy load first gear, medium load first gear and first gear transportation, a clutch C2 for controlling heavy load second gear, light load second gear and second gear transportation, a solid input shaft and a hollow input shaft; and gear selecting and shifting gear sets are arranged between the corresponding sections of the input shaft and the output shaft of the clutch C1 and the clutch C2. The invention adds three driving operation modes, optimizes the working area of the engine, improves the utilization efficiency of energy and can realize the aims of energy-saving and environment-friendly operation of the tractor.
Description
Technical Field
The invention belongs to the technical field of tractors, and relates to a hybrid DCT tractor and an automatic gear shifting control method thereof.
Background
At present, the technology of the automatic transmission is developed very rapidly, particularly, the double-clutch automatic transmission has a very good development trend, the technology of the automatic transmission is mature, the problem of transmission interruption of gear shifting power can be well solved, and the automatic transmission is applied more and more widely in recent years.
The double-clutch automatic transmission applied to the high and medium horsepower tractor comprises a main input shaft used for being connected with a power source, a double clutch in transmission connection with the main input shaft, an intermediate shaft and a main output shaft, wherein the double clutch comprises an input end in coaxial transmission connection with the main input shaft, an odd-numbered gear transmission shaft, an even-numbered gear transmission shaft and a clutch mechanism used for selecting the input end to be in transmission connection with the odd-numbered gear transmission shaft or the even-numbered gear transmission shaft. Odd-even gear transmission shafts and even-even gear transmission shafts are arranged between the corresponding sections of the intermediate shafts, and corresponding odd-even gear sets and corresponding odd-even gear synchronizers are arranged between the odd-even gear transmission shafts and the even-even gear transmission shafts. Because one clutch in the double clutches corresponds to an odd gear and the other clutch corresponds to an even gear, when the vehicle is shifted into one gear, the other clutch and the corresponding next gear are already in a preparation state through the corresponding synchronizer, and the next gear can be immediately engaged as long as the current gear is separated, so that the gear selecting and shifting speed of the double-clutch transmission is very high, and the problem of power transmission interruption can be well solved.
However, although the dual clutch automatic transmission in the prior art can better solve the problem of power transmission interruption, when the dual clutch automatic transmission is used on a tractor driven by a diesel engine, the power of the engine cannot be fully utilized due to the reasons that the tractor is complex in use condition, more in gear requirement, large in pollution emission and the like, and serious energy waste and exhaust emission are caused. The hybrid power system tractor is additionally provided with the motor, so that the working area of the engine can be optimized, the energy utilization rate is improved, and the method is an effective method for realizing energy conservation and environmental protection of the tractor.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned deficiencies of the prior art, the present invention aims to provide a hybrid DCT tractor and an automatic gear shifting control method thereof, which increase three driving operation modes, optimize the working area of an engine, improve the energy utilization efficiency, and achieve the objectives of energy saving and environmental protection operation of the tractor through the matching operation of the mechanical transmission and the motor of the hybrid dual clutch automatic transmission.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a hybrid DCT tractor comprises a shell, a main input shaft, a main output shaft, a power output shaft PTO, a double-clutch automatic transmission, a speed reducing motor, a power coupling device, a central transmission part and a driving hub, wherein the main input shaft is connected to a crankshaft of an engine in a transmission mode and used for inputting power;
the output end of the engine is coaxially connected with the input end of the double-clutch automatic transmission, two pairs of low-speed PTO gear pair and high-speed PTO gear pair used for operating agricultural implements with different rotating speeds are arranged on the output shaft of the engine, the low-speed PTO gear pair and the high-speed PTO gear pair are coaxially connected with the power output shaft PTO, and the power output shaft PTO is connected with a power output shaft synchronizer positioned between the low-speed PTO gear pair and the high-speed PTO gear pair;
the double-clutch automatic transmission comprises a clutch shell in transmission connection with an output shaft of an engine, a clutch C1 for controlling heavy load first gear, medium load first gear and first gear transportation, a clutch C2 for controlling heavy load second gear, light load second gear and second gear transportation, a solid input shaft and a hollow input shaft; all be equipped with between the corresponding section of clutch C1, clutch C2's input shaft and output shaft and select the gear train of shifting, the correspondence is equipped with hollow shaft driving gear, hollow shaft driven gear on the hollow input shaft, the last gear train of shifting of selecting of hollow input shaft includes that heavy load keeps off the gear pair, well load keeps off the gear pair, transportation and keeps off the gear pair, the last gear train of shifting of selecting of solid input shaft includes that heavy load keeps off the gear pair, well load keeps off the gear pair, transportation two keep off the gear pair.
Furthermore, the heavy-load first-gear pair and the transportation first-gear pair are arranged in pairs, a heavy-load first-gear synchronizer and a transportation first-gear synchronizer which are used for selecting one gear pair to be connected with the output shaft and the other gear pair to continuously keep an empty sleeve are arranged between the heavy-load first-gear pair and the transportation first-gear synchronizer, the transportation first-gear pair and the middle-load first-gear pair are arranged in pairs, a middle-load first-gear synchronizer is arranged between the transportation first-gear pair and the middle-load first-gear pair, the middle-load first-gear pair is connected with the hollow shaft driven gear, the heavy-load first-gear pair is respectively connected with the transmission output shaft driving gear and the transmission output shaft driven gear.
Further, the second gear pair of centre load and the second gear pair of transportation are arranged in pairs and are equipped with the second synchronizer of centre load between the two, the second gear pair of transportation and the second gear pair of heavy load are arranged in pairs and are equipped with the second synchronizer of transportation and heavy load between the two, the second gear pair of heavy load links to each other with gear motor's power coupling device.
Further, the solid input shaft is in a solid shaft form, the hollow input shaft is in a hollow shaft sleeve form coaxially sleeved on the solid input shaft, the clutch C2 is used for controlling the solid input shaft to be connected, and the clutch C1 is used for controlling the hollow input shaft to be connected.
Further, the output end of the speed reducing motor is coaxially connected with the tail end of a solid input shaft of the double-clutch automatic transmission; the speed reducing motor comprises an input shaft, an output shaft synchronously arranged on the same axis and a power coupling device integrated inside.
Furthermore, the power coupling device is a planetary gear type rotating speed coupling system, a sun gear of the power coupling device is connected with a solid input shaft of the double-clutch automatic transmission, an inner gear ring is connected with an output shaft of the speed reducing motor, and a planetary gear is connected with a heavy-load secondary gear pair.
Furthermore, the tractor further comprises an automatic gear shifting control system, wherein the automatic gear shifting control system comprises an automatic gearbox control unit TCU, a sensor system, a signal processing part and an execution mechanism;
the automatic gear shifting control method comprises the following steps:
s1: when the tractor load power output shaft PTO works, the automatic transmission control unit TCU controls the power output shaft synchronizer to select a proper rotating speed gear by receiving an engine rotating speed signal and a PTO rotating speed signal, so that the PTO keeps constant rotating speed and outputs stable power;
s2: the automatic gearbox control unit TCU detects a driving operation mode required by the tractor, the sensor system controls the on-off of the clutch C1 and the clutch C2 by detecting the rotating speed of the solid input shaft or the hollow input shaft, and simultaneously controls the on-off of the speed reducing motor, and each synchronizer is connected;
s3: the power transmission route is as follows: the engine transmits power to the high-speed PTO gear pair or the low-speed PTO gear pair through the main input shaft, selects a required rotating speed gear through the power output shaft synchronizer, and transmits torque to the power output shaft PTO, so that the power output shaft PTO can keep constant rotating speed and output stable power outwards; on the other hand, power is transmitted to the following double-clutch automatic transmission through the output end, the double-clutch automatic transmission outputs the rotating speed which is the same as the gear of the corresponding gear selecting and shifting gear set to the power output shaft PTO through the clutch C1, the clutch C2, the corresponding gear selecting and shifting gear set and the synchronizer, then the torque is transmitted to the central transmission part through the output gear pair on the power output shaft PTO, and finally the torque is transmitted to the driving hub of the tractor to drive the tractor to run under load.
Further, the sensor system includes a speed sensor, a pressure sensor, a temperature sensor, a position sensor, and is used to detect vehicle speed, transmission input and output shaft speeds, pressure on the dual clutch, and status signals.
Further, the driving operation mode of the tractor in the step S2 includes: an Electric Vehicle (EV) operation mode, a hybrid operation mode, and an engine operation mode; the pure electric drive operation mode (EV) is as follows: when the hybrid power double-clutch automatic transmission tractor is in light-load operation and the running speed is not high, the motor is used for driving the tractor to run; the hybrid power driving operation mode is as follows: when the tractor works in a heavy-load gear and a medium-load gear and the required power is high, the engine and the motor simultaneously drive the tractor to run; the engine driving operation mode is as follows: when the tractor works in the transport gear and the required power is appropriate, the engine provides the tractor working power and simultaneously provides additional generating power for the motor to charge the battery pack.
The invention has the beneficial effects that:
the torque transmitted by the engine is transmitted to the PTO gear selecting and shifting synchronizer through the high-speed and low-speed PTO gear pair through the crankshaft to be used as the load power output of the tractor; on the other hand, power is transmitted to a subsequent double-clutch automatic transmission through an output end, the double-clutch automatic transmission outputs the rotating speed which is the same as the gear of the corresponding gear selecting and shifting gear set to a power output shaft PTO through a multi-plate clutch, the corresponding gear selecting and shifting gear set and a synchronizer, then transmits torque to a central transmission part through an output gear pair on the power output shaft PTO, and finally reaches a driving hub of a tractor to drive the tractor to run under load;
the hybrid DCT tractor provided by the invention has three driving operation modes, including a pure electric driving operation mode (EV), a hybrid driving operation mode and an engine driving operation mode. The automatic transmission control unit TCU can automatically switch a driving operation mode according to the operation working condition of the tractor; through the matching work of the mechanical transmission and the motor of the hybrid power double-clutch automatic transmission, three driving operation modes are added, the working area of an engine is optimized, the utilization efficiency of energy is improved, and the aims of energy saving and environment-friendly operation of a tractor can be fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic illustration of the transmission configuration of one embodiment of a dual clutch automatic transmission of the present invention;
FIG. 2 is a schematic diagram of the operation of the hybrid drive mode of operation;
FIG. 3 is a transmission schematic diagram of an Electric Vehicle (EV) operating mode;
FIG. 4 is a transmission schematic for a hybrid drive mode of operation;
FIG. 5 is a schematic diagram of one transmission of an engine-driven mode of operation;
FIG. 6 is a schematic diagram of an automatic shift control relationship for a dual clutch automatic transmission;
the labels in the figure are: 1. the gear transmission comprises an engine, 2, a low-speed PTO gear pair, 3, a high-speed PTO gear pair, 4, a clutch C2, 5, a clutch C1, 6, a hollow shaft driving gear, 7, a medium-load two-gear pair, 8, a medium-load two-gear synchronizer, 9, a transportation two-gear pair, 10, a transportation two-gear and heavy-load two-gear synchronizer, 11, a heavy-load two-gear pair, 12, a power coupling device, 13, a speed reducing motor, 14, a transmission output shaft driving gear, 15, a driving hub, 16, a central transmission part, 17, a transmission output shaft driven gear, 18, a heavy-load one-gear pair, 19, a heavy-load one-gear and transportation one-gear synchronizer, 20, a transportation one-gear pair, 21, a medium-load one-gear synchronizer, 22, a medium-load one-gear pair, 23, a hollow shaft driven gear, 24, a.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
A hybrid DCT tractor comprises a shell, a main input shaft, a main output shaft, a power output shaft PTO24, a double-clutch automatic transmission, a speed reducing motor 13, a power coupling device 12, a central transmission part 16 and a driving hub 15, wherein the main input shaft is connected to a crankshaft of an engine 1 in a transmission way and used for inputting power, the main output shaft is used for outputting power to the central transmission part 16, the power output shaft PTO24 is used for outputting power by a load;
the output end of the engine 1 is coaxially connected with the input end of the double-clutch automatic transmission, two pairs of low-speed PTO gear pair 2 and high-speed PTO gear pair 3 used for operating agricultural implements with different rotating speeds are arranged on the output shaft of the engine 1, the low-speed PTO gear pair 2 and the high-speed PTO gear pair 3 are coaxially connected with the power output shaft PTO24, and the power output shaft PTO24 is connected with a power output shaft synchronizer 25 positioned between the low-speed PTO gear pair 2 and the high-speed PTO gear pair 3;
the double-clutch automatic transmission comprises a clutch shell in transmission connection with an output shaft of the engine 1, a clutch C15 for controlling heavy load first gear, medium load first gear and first gear transportation, a clutch C24 for controlling heavy load second gear, light load second gear and second gear transportation, a solid input shaft and a hollow input shaft; as shown in fig. 1, gear selecting and shifting gear sets are arranged between corresponding sections of the input shaft and the output shaft of the clutch C15 and the clutch C24, a hollow shaft driving gear 6 and a hollow shaft driven gear 23 are correspondingly arranged on the hollow input shaft, the gear selecting and shifting gear sets on the hollow input shaft comprise a heavy-load first-gear pair 18, a medium-load first-gear pair 22 and a transportation first-gear pair 20, and the gear selecting and shifting gear sets on the solid input shaft comprise a heavy-load second-gear pair 11, a medium-load second-gear pair 7 and a transportation second-gear pair 9. Furthermore, the gears of the gear selecting and shifting gear set are arranged from big to small according to the transmission in sequence as follows: heavy load first gear, heavy load second gear, medium load first gear, medium load second gear, light load gear, first transport gear and second transport gear; furthermore, the idle gears in the gear selecting and shifting gear set are adjacently arranged in pairs in a one-to-one corresponding relationship according to the set gear selecting and shifting gears; a synchronizer used for selecting one of the pair of the idle gears to be fixedly connected with the shaft and continuously keeping the other idle gear idle is arranged between the two idle gears.
Further, the clutch C15 controls the engagement of the first gear for heavy load, the first gear for medium load and the first gear for transport, and the clutch C24 controls the engagement of the second gear for heavy load, the second gear for light load and the second gear for transport. Furthermore, the double-clutch automatic transmission is two groups of multi-plate clutches which are coaxially arranged together and are arranged in a closed oil cavity filled with hydraulic oil, and the structure has better adjusting capacity and excellent hot melting property and can transmit larger torque.
Further, the heavy-load first-gear pair 18 and the transportation first-gear pair 20 are arranged in pairs, a heavy-load first-gear synchronizer 19 used for selecting one gear pair to be connected with the output shaft and continuously keeping the other gear pair empty and a transportation first-gear synchronizer 19 are arranged between the heavy-load first-gear pair 18 and the transportation first-gear pair 20, the transportation first-gear pair 20 and the medium-load first-gear pair 22 are arranged in pairs, a medium-load first-gear synchronizer 21 is arranged between the transportation first-gear pair 20 and the medium-load first-gear pair 22, the medium-load first-gear pair 22 is connected with the hollow shaft driven gear 23, the heavy-load first-gear pair 18 is respectively connected with the transmission output shaft driving gear 14 and the transmission output shaft driven gear 17, the transmission.
Further, second gear pair 7 of centre load and second gear pair 9 of transportation are arranged in pairs and are equipped with second synchronizer 8 of centre load between the two, second gear pair 9 of transportation and second gear pair 11 of heavy load are arranged in pairs and are equipped with second synchronizer 10 of transportation and heavy load between the two, second gear pair 11 of heavy load links to each other with gear motor 13's power coupling device 12.
Further, the solid input shaft is in a solid shaft form, the hollow input shaft is in a hollow shaft sleeve form coaxially sleeved on the solid input shaft, the clutch C24 is used for controlling the solid input shaft to be connected, and the clutch C15 is used for controlling the hollow input shaft to be connected.
Further, the output end of the speed reducing motor 13 is coaxially connected with the tail end of a solid input shaft of the double-clutch automatic transmission; the speed reducing motor 13 comprises an input shaft, an output shaft synchronously arranged on the same axis, and a power coupling device 12 integrally arranged inside.
Further, the power coupling device 12 is a planetary gear type rotational speed coupling system, a sun gear of the power coupling device is connected with a solid input shaft of the double-clutch automatic transmission, an inner gear ring is connected with an output shaft of the speed reducing motor 13, and a planetary gear is connected with the heavy-load secondary gear pair 11.
The invention relates to an automatic gear shifting control method of a hybrid DCT tractor, which comprises an automatic gear shifting control system, wherein the automatic gear shifting control system comprises an automatic gearbox control unit TCU, a sensor system, a signal processing part and an execution mechanism; further, the sensor system is used for a sensor for detecting the rotation speed of PTO24 of the power output shaft and a sensor for detecting the rotation speed of the crankshaft of the engine; the automatic transmission control unit TCU is used for acquiring rotating speed information of a rotating speed sensor and controlling the rotating speed of the power output shaft PTO24 according to the rotating speed information, a signal output end of the rotating speed sensor is connected with a signal input end of the automatic transmission control unit TCU, and the automatic transmission control unit TCU is in control connection with a hydraulic control system of the tractor; the automatic transmission control unit TCU receives the vehicle running state information detected by the sensor system and the intervention information given by the driver to carry out comparison operation, then sends out a control command according to a set rule, and controls the transmission to work through a corresponding execution mechanism; the electronic control unit TCU of the gearbox can automatically switch the driving operation mode according to the operation working condition of the tractor; the sensor system is used for testing the running state of the vehicle, converting the mechanical quantity of the running state information of the vehicle into an electric signal and providing a reference basis for gear shifting opportunity; the actuating mechanism comprises a gear shifting electromagnetic valve and a pressure regulating electromagnetic valve and is used for receiving a control command of the automatic transmission control unit TCU and then carrying out automatic gear switching and oil pressure regulation on the double clutches;
the automatic gear shifting control method comprises the following steps:
s1: when the tractor load power output shaft PTO24 works, the automatic transmission control unit TCU controls the power output shaft synchronizer 25 to select a proper rotating speed gear by receiving a rotating speed signal of the engine 1 and a rotating speed signal of the PTO, so that the PTO keeps constant rotating speed and outputs stable power;
s2: the automatic gearbox control unit TCU detects a driving operation mode required by the tractor, the sensor system controls the on-off of the clutch C15 and the clutch C24 by detecting the rotating speed of the solid input shaft or the hollow input shaft, and simultaneously controls the on-off of the speed reducing motor 13, and each synchronizer is connected;
s3: the power transmission route is as follows: the engine 1 transmits power to the high-speed PTO gear pair 3 or the low-speed PTO gear pair 2 through the main input shaft, selects a required rotating speed gear through the power output shaft synchronizer 25, and transmits torque to the power output shaft PTO24, so that the power output shaft PTO24 can keep constant rotating speed and output stable power outwards; on the other hand, power is transmitted to the following dual-clutch automatic transmission through the output end, the dual-clutch automatic transmission outputs the same rotating speed as the gear of the corresponding gear selecting and shifting gear set to the power output shaft PTO through the clutch C15, the clutch C24, the corresponding gear selecting and shifting gear set and the synchronizer, then transmits torque to the central transmission part 16 through the output gear pair on the power output shaft PTO, and finally reaches the driving hub 15 of the tractor to drive the tractor to run under load.
Further, the sensor system includes a speed sensor, a pressure sensor, a temperature sensor, a position sensor, and is used to detect vehicle speed, transmission input and output shaft speeds, pressure on the dual clutch, and status signals.
Further, the driving operation mode of the tractor in the step S2 includes: an Electric Vehicle (EV) operation mode, a hybrid operation mode, and an engine operation mode; the electronic control unit TCU of the gearbox can automatically switch the driving operation mode according to the operation working condition of the tractor; the pure electric drive operation mode (EV) is as follows: when the hybrid power double-clutch automatic transmission tractor is in light-load operation and the running speed is not high, the motor is used for driving the tractor to run; the hybrid power driving operation mode is as follows: when the tractor works in a heavy-load gear and a medium-load gear and the required power is high, the engine 1 and the motor simultaneously drive the tractor to run; the engine driving operation mode is as follows: when the tractor works in the transport gear and the required power is appropriate, the engine 1 provides the tractor working power and simultaneously provides additional generating power for the motor to charge the battery pack.
When the tractor works, the torque transmission routes of all gears of the double-clutch automatic transmission are similar, and the transmission principles are the same. The following specifically describes states of various components and power transmission routes of the hybrid DCT tractor in three driving operation modes, and the rest of gears are analogized, which are not specifically described and are within the protection scope of the present invention:
as shown in fig. 3, the electric vehicle only operation mode (EV): the electronic control unit TCU of the gearbox detects that the tractor needs to work in a light-load gear position, the sensor system detects the rotating speed of the solid input shaft,
the clutch C24 controlling the solid input shaft and the clutch C15 controlling the hollow input shaft are disconnected, and at the same time, the reduction motor 13 is started, and the second-gear and heavy-duty second-gear synchronizer 10 is transported to be engaged according to the right side of the figure. The power transmission route is as follows: on one hand, the torque transmitted by the engine 1 is transmitted to the power output shaft synchronizer 25 through the low-speed PTO gear pair 2 on the output shaft of the engine 1, and finally is taken as the load power output of the tractor through the power output shaft PTO 24; on the other hand, the electric energy is transmitted to the speed reducing motor 13 through the storage battery and the inverter, the driving force is transmitted to the heavy-duty secondary gear pair 11 through the power coupling device 12 from the speed reducing motor 13, then transmitted to the transmission output shaft driving gear 14 through the main output shaft of the double-clutch automatic transmission, transmitted to the central transmission part 16 through the transmission output shaft driven gear 17, and finally distributed to the driving hub 15 through the internal gear mechanism of the central transmission part 16, so that the tractor is driven to move forwards.
As shown in fig. 2 and 4, the hybrid drive operation mode: the automatic gearbox control unit TCU detects that the tractor needs heavy-load gear operation, the sensor system controls the clutch C15 of the hollow input shaft to be jointed by detecting the rotating speed of the hollow input shaft, the heavy-load first-gear and first-gear transportation synchronizer 19 is jointed according to the right side of the figure, meanwhile, the speed reduction motor 13 is started, and the second-gear and heavy-load second-gear transportation synchronizer 10 is jointed according to the right side of the figure. The power transmission route is as follows: on one hand, the torque transmitted by the engine 1 is transmitted to the power output shaft synchronizer 25 through the low-speed PTO gear pair 2 on the engine output shaft, and finally is taken as the load power output of the tractor through the power output shaft PTO 24; on the other hand, the torque transmitted from the engine 1 is transmitted to the clutch C15 of the hollow input shaft through the engine input shaft, and then transmitted to the heavy-duty first-gear pair 18 through the hollow driving gear 6 and the hollow driven gear 23 on the hollow input shaft. At this time, the electric energy is transmitted to the speed reducing motor 13 through the storage battery and the inverter, the driving force is transmitted from the speed reducing motor 13 to the heavy-duty second gear pair 11 through the power coupling device 12, the power is coupled at the driven gear in the heavy-duty first gear pair 18, and then transmitted to the transmission output shaft driving gear 14 through the transmission main output shaft, the power is transmitted to the central transmission part 16 through the transmission output shaft driven gear 17, and finally the power is distributed to the driving hub 15 through the internal gear mechanism of the central transmission part 16, so that the tractor is driven to move forward.
As shown in fig. 5, the engine-driven operation mode: the automatic transmission control unit TCU detects that the tractor needs to transport gear operation, the sensor system controls the clutch C24 of the solid input shaft to be jointed by detecting the rotating speed of the solid input shaft, and the synchronizer 10 for transporting the second gear and the heavy-load second gear is jointed according to the left side of the figure. The power transmission route is as follows: on one hand, the torque transmitted by the engine 1 is transmitted to the power output shaft synchronizer 25 through the high-speed PTO gear pair 3 on the engine output shaft, and finally is taken as the load power output of the tractor through the power output shaft PTO 24; on the other hand, the torque transmitted from the engine 1 is transmitted to the solid input shaft clutch C24 through the engine input shaft, then transmitted to the main output shaft of the transmission through the transport secondary gear pair 9 on the solid input shaft, transmitted to the central transmission part 16 through the transmission output shaft driving gear 14 and the transmission output shaft driven gear 17, and finally distributed to the driving hub 15 through the internal gear mechanism of the central transmission part 16, so as to drive the tractor to move forward.
When the tractor works in a load gear of a certain driving mode, the automatic gear shifting specific control method of the double-clutch automatic transmission comprises the following four parts as shown in fig. 6:
1. the automatic transmission control unit TCU, which is the control center for the entire transmission system. The automatic gear shifting control system is arranged on a box body of the double-clutch automatic transmission, collects information transmitted by various sensors in the transmission in real time, communicates with an engine, an ABS (anti-lock brake system), an instrument and other electric control units through a CAN (controller area network) bus, compares and analyzes acquired various state information with an automatic gear shifting curve, and controls a gear shifting mechanism and a clutch control mechanism according to a selected control strategy to perform gear shifting operation at a set gear shifting point. The automatic transmission control unit TCU compares the parameters acquired by the sensor with the gear shifting target parameters, and continuously sends out control commands to adjust until gear shifting is completed;
2. and a sensor system, which mainly monitors various control parameters of the dual clutch automatic transmission. The sensor system includes speed sensors, pressure sensors, temperature sensors, position sensors, etc. for sensing vehicle speed, transmission input and output shaft speeds, pressure on the dual clutches, and other status signals. The rotating speed sensor is responsible for monitoring the rotating speeds of the input shaft and the output shaft of the transmission and the rotating speed of the input shaft of the double clutch; the pressure sensor mainly detects the oil pressure on the double clutches; the temperature sensor and the displacement sensor respectively measure the temperature of engine oil and the displacement and gear information of the gear shift lever;
the sensor system further comprises a rotating speed sensor, and the rotating speed sensor monitoring objects comprise a transmission input rotating speed, a clutch input shaft rotating speed and a transmission output rotating speed. Except that the sensors for monitoring the rotating speeds of the input shaft and the output shaft of the transmission are positioned on the outer edges of the transmission shell and the double clutches, other rotating speed sensors are integrated on the electronic control device;
the sensor system also includes two pressure sensors on the electro-hydraulic unit that monitor the pressure on the multi-plate clutches C15 and C24, respectively. The two pressure sensors feed back the monitored pressure information to the automatic transmission control unit TCU. The automatic transmission control unit TCU adjusts the pressure value on the multi-plate clutch according to the feedback, so that the engagement and the disengagement of the clutch are more accurate;
the sensor monitoring system also comprises a position sensor which comprises a gear adjusting sensor, a gear shifting lever position sensor and a sensor for identifying manual automatic gear shifting. Each gear shifting fork is provided with a gear adjusting displacement sensor for monitoring, signals are fed back to an automatic Transmission Control Unit (TCU), and the engine oil pressure acting on the gear shifting fork is adjusted according to the accurate position, so that accurate gear shifting is finally realized;
3. and a signal processing part, wherein an input signal of the system comprises an analog quantity, a pulse quantity and a digital quantity. The analog signals include throttle opening, transmission oil temperature, oil pressure, etc. The analog signal is converted into a digital signal after sampling and A/D conversion, and the digital signal enters a central processing unit for processing. For pulse signals such as input and output rotating speeds of a gearbox, rotating speed of an input shaft of a clutch and the like, the number of pulses is recorded by using a counter after shaping, and the acquisition of rotating speed signals is realized;
4. and the actuating mechanism comprises a clutch pressure regulating valve and a gear regulating electromagnetic valve. The clutch pressure regulating valves are respectively responsible for controlling the pressure on the multi-plate clutches C1 and C2, and the electronic control unit adjusts the pressure on the clutches C1 and C2 according to the feedback time of the pressure sensors so as to be matched with the current situation; the gear adjusting electromagnetic valve controls the oil pressure of a shifting fork through a multi-way switching valve, and the shifting fork moves under the action of oil pressure and simultaneously drives a synchronizer to select a corresponding gear.
In summary, the overall general working principle of the present invention is as follows: the torque transmitted by the engine is transmitted to the PTO gear selecting and shifting synchronizer through the high-speed and low-speed PTO gear pair through the crankshaft to be used as the load power output of the tractor; on the other hand, power is transmitted to a subsequent double-clutch automatic transmission through an output end, the double-clutch automatic transmission outputs the rotating speed which is the same as the gear of the corresponding gear selecting and shifting gear set to a power output shaft PTO through a multi-plate clutch, the corresponding gear selecting and shifting gear set and a synchronizer, then transmits torque to a central transmission part through an output gear pair on the power output shaft PTO, and finally reaches a driving hub of a tractor to drive the tractor to run under load;
in addition, the hybrid DCT tractor has three driving operation modes, including an Electric Vehicle (EV) driving operation mode, a hybrid driving operation mode and an engine driving operation mode. The automatic transmission control unit TCU can automatically switch a driving operation mode according to the operation working condition of the tractor; through the matching work of the mechanical transmission and the motor of the hybrid power double-clutch automatic transmission, three driving operation modes are added, the working area of an engine is optimized, the utilization efficiency of energy is improved, and the aims of energy saving and environment-friendly operation of a tractor can be fulfilled.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a hybrid DCT tractor, includes the casing, its characterized in that: the power transmission device also comprises a main input shaft which is connected with a crankshaft of the engine (1) in a transmission way and used for inputting power, a main output shaft which outputs power to the central transmission part (16), a power output shaft PTO (24) which is used for outputting power by a load, a double-clutch automatic transmission, a speed reducing motor (13), a power coupling device (12), the central transmission part (16) and a driving hub (15);
the output end of the engine (1) is coaxially connected with the input end of the double-clutch automatic transmission, two pairs of low-speed PTO gear pair (2) and high-speed PTO gear pair (3) used for operating agricultural implements with different rotating speeds are arranged on the output shaft of the engine (1), the low-speed PTO gear pair (2) and the high-speed PTO gear pair (3) are coaxially connected with the power output shaft PTO (24), and the power output shaft PTO (24) is connected with a power output shaft synchronizer (25) positioned between the low-speed PTO gear pair (2) and the high-speed PTO gear pair (3);
the double-clutch automatic transmission comprises a clutch shell in transmission connection with an output shaft of an engine (1), a clutch C1 (5) for controlling a heavy-load first gear, a medium-load first gear and a first-gear transportation, a clutch C2 (4) for controlling a heavy-load second gear, a light-load second gear and a second-gear transportation, a solid input shaft and a hollow input shaft; all be equipped with between the corresponding section of the input shaft of clutch C1 (5), clutch C2 (4) and output shaft and select the gear train of shifting, the correspondence is equipped with hollow shaft driving gear (6), hollow shaft driven gear (23) on the hollow input shaft, the epaxial gear train of shifting of selecting of hollow input includes heavy load first gear pair (18), well load first gear pair (22), transportation first gear pair (20), the epaxial gear train of shifting of selecting of solid input includes heavy load second gear pair (11), well load second gear pair (7), transportation second gear pair (9).
2. The hybrid DCT tractor according to claim 1, wherein: the heavy-load first-gear pair (18) and the transportation first-gear pair (20) are arranged in pairs, a heavy-load first-gear synchronizer and a transportation first-gear synchronizer (19) used for selecting one gear pair to be connected with an output shaft and continuously keeping the empty sleeve are arranged between the heavy-load first-gear pair and the transportation first-gear synchronizer, the transportation first-gear pair (20) and the medium-load first-gear pair (22) are arranged in pairs, a medium-load first-gear synchronizer (21) is arranged between the transportation first-gear pair and the medium-load first-gear pair (22), the medium-load first-gear pair (22) is connected with the hollow shaft driven gear (23), the heavy-load first-gear pair (18) is respectively connected with the transmission output shaft driving gear (14) and the transmission output shaft driven gear (17), the transmission output shaft driving gear (14) and the transmission output.
3. The hybrid DCT tractor according to claim 1, wherein: two gear pair (7) of centre load and transportation two gear pair (9) are arranged in pairs and are equipped with two synchronizers (8) of centre load between the two, two gear pair (9) of transportation and two gear pair (11) of heavy load are arranged in pairs and are equipped with two gears of transportation and two gears of heavy load synchronizer (10) between the two, two gear pair (11) of heavy load link to each other with power coupling device (12) of gear motor (13).
4. The hybrid DCT tractor according to claim 1, wherein: the solid input shaft is in a solid shaft form, the hollow input shaft is in a hollow shaft sleeve form coaxially sleeved on the solid input shaft, the clutch C2 (4) is used for controlling the solid input shaft to be connected, and the clutch C1 (5) is used for controlling the hollow input shaft to be connected.
5. The hybrid DCT tractor according to claim 1, wherein: the output end of the speed reducing motor (13) is coaxially connected with the tail end of a solid input shaft of the double-clutch automatic transmission; the speed reducing motor (13) comprises an input shaft, an output shaft synchronously arranged on the same axis and a power coupling device (12) integrally arranged inside.
6. The hybrid DCT tractor according to claim 5, wherein: the power coupling device (12) is a planetary gear type rotating speed coupling system, a sun gear of the power coupling device is connected with a solid input shaft of the double-clutch automatic transmission, an inner gear ring is connected with an output shaft of a speed reducing motor (13), and a planetary gear is connected with a heavy-load secondary gear pair (11).
7. The automatic gear shifting control method of the hybrid DCT tractor according to claim 1, wherein: the tractor also comprises an automatic gear shifting control system, wherein the automatic gear shifting control system comprises an automatic gearbox control unit (TCU), a sensor system, a signal processing part and an actuating mechanism;
the automatic gear shifting control method comprises the following steps:
s1: when a tractor load power output shaft PTO (24) works, an automatic transmission control unit TCU controls a power output shaft synchronizer (25) to select a proper rotating speed gear by receiving a rotating speed signal of an engine (1) and a rotating speed signal of the PTO, so that the PTO keeps constant rotating speed and outputs stable power;
s2: the automatic gearbox control unit TCU detects a driving operation mode required by the tractor, the sensor system controls the on-off of the clutch C1 (5) and the clutch C2 (4) by detecting the rotating speed of the solid input shaft or the hollow input shaft, and simultaneously controls the on-off of the speed reducing motor (13), and each synchronizer is connected;
s3: the power transmission route is as follows: the engine (1) transmits power to the high-speed PTO gear pair (3) or the low-speed PTO gear pair (2) through the main input shaft, selects a required rotating speed gear through the power output shaft synchronizer (25), and transmits torque to the power output shaft PTO (24), so that the power output shaft PTO (24) can keep constant rotating speed and output stable power outwards; on the other hand, power is transmitted to a subsequent double-clutch automatic transmission through an output end, the double-clutch automatic transmission outputs the same rotating speed as the gear of the corresponding gear selecting and shifting gear set to a power output shaft PTO through a clutch C1 (5), a clutch C2 (4), the corresponding gear selecting and shifting gear set and a synchronizer, then transmits torque to a central transmission part (16) through an output gear pair on the power output shaft PTO, and finally reaches a driving hub (15) of the tractor to drive the tractor to run under load.
8. The automatic gear shifting control method of a hybrid DCT tractor according to claim 7, wherein: the sensor system includes a speed sensor, a pressure sensor, a temperature sensor, a position sensor, and is used to detect vehicle speed, transmission input and output shaft speeds, pressure on the dual clutches, and status signals.
9. The automatic gear shifting control method of a hybrid DCT tractor according to claim 7, wherein: the driving operation mode of the tractor in the step S2 includes: an Electric Vehicle (EV) operation mode, a hybrid operation mode, and an engine operation mode; the pure electric drive operation mode (EV) is as follows: when the hybrid power double-clutch automatic transmission tractor is in light-load operation and the running speed is not high, the motor is used for driving the tractor to run; the hybrid power driving operation mode is as follows: when the tractor works in a heavy-load gear and a medium-load gear and the required power is high, the engine (1) and the motor simultaneously drive the tractor to run; the engine driving operation mode is as follows: when the tractor works in the transport gear and the required power is appropriate, the engine (1) provides the tractor working power and simultaneously provides additional generated power for the motor to charge the battery pack.
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