188 results about "Engine-generator" patented technology

The present invention relates to the technical field of tractors. Disclosed are a hybrid system and a tractor. The hybrid system comprises an engine, a generator, a battery, a driving motor, a power output device, a rear axle, a brake, a first gear shifting device and a power transmission module, wherein the power transmission module comprises a planet gear assembly, a first transmission assembly, a second transmission assembly and a third transmission assembly. An output shaft of the engine is connected to the power output device, the driving motor is in transmission connection with a sun gear, the sun gear is in transmission connection with a planet gear, the planet gear is in transmission connection with a ring gear, and a planet carrier is connected to the planet gear. The engine is connected to the generator, the brake is arranged on the ring gear, and the generator is in transmission connection with the ring gear by means of the first gear shifting device. The planet carrier is connected to the rear axle, the generator is connected to the battery, and the battery is connected to the driving motor. The hybrid system disclosed by the present invention is a simplified system, and saves on costs.

The invention provides a vehicle control method and a vehicle, and the vehicle comprises a range extending system which comprises an engine, a generator and a power battery which are sequentially connected in series; a drive shaft; the driving motor is connected with the power battery and the driving shaft so as to drive the driving shaft to rotate; the one-way clutch is arranged between the output end of the engine and the driving shaft, and the range extending system can be connected with the driving motor in series or in parallel through disconnection or connection of the one-way clutch; the method comprises the step of controlling the start-stop state and / or the working mode of an engine according to the speed of a vehicle under the condition that a one-way clutch has an adhesion fault, so that the running state of the engine is matched with the rotating speed of a driving shaft.

The invention relates to a driving system for a hybrid tractor, which comprises an engine, a generator, a front motor and a rear motor, and the engine is in transmission connection with a PTO (Power Take Off); the front axle input shaft is in transmission connection with the front motor and the normally-combined clutch input shaft, a normally-combined clutch is arranged on the normally-combined clutch input shaft, a parking brake is arranged on the normally-combined clutch input shaft, and the parking brake is connected with the rear axle. An input shaft of the normally-combined clutch is in transmission connection with a small cone shaft, a mode switching clutch is arranged on the small cone shaft, the small cone shaft is in transmission connection with the input shaft of the normally-combined clutch and a rear motor, and one end of a sun wheel shaft is connected with a rear wheel through a planetary gear mechanism. And a service brake is arranged on the sun wheel shaft. The normally-combined clutch input shaft, the normally-combined clutch and the transmission mechanism are arranged between the front axle and the rear axle, so that the four-wheel braking function is achieved.

The invention provides an ECVT variable speed power system which comprises an engine, a generator, a power battery pack, a motor and a drive axle assembly, the generator is electrically connected with the power battery pack, and the power battery pack is electrically connected with the motor; a first shaft is arranged at the output end of the engine, the first shaft is in transmission connection with an input shaft of the generator, and an intervention clutch is arranged on the first shaft. A second shaft is arranged at the output end of the motor, a planet wheel mechanism is arranged on the second shaft, a sun wheel of the planet wheel mechanism is in transmission connection with the second shaft, a gear ring is in transmission connection with the driven end of the intervention clutch, and a planet carrier is in transmission connection with an input shaft of the drive axle assembly. According to the invention, the planet wheel mechanism is driven by the motor, so that stepless speed change is realized; meanwhile, switching of multiple modes of a pure electric mode, a series mode and a hybrid mode can be supported, it is guaranteed that the engine operates in an economic interval, the energy efficiency is improved, oil consumption is reduced, and the use cost is low.

The utility model provides a power system, a new energy series-parallel power system and an automatic driving vehicle. The power system comprises an engine; the generator is in transmission connection with an output shaft of the engine; the input end of the gearbox is in transmission connection with an output shaft of the engine, and the output end of the gearbox is used for being in transmission connection with a main speed reducer; an output shaft of the first driving motor is in coupling transmission connection with an output shaft of the generator through a main clutch, and the output shaft of the first driving motor is selectively in transmission connection with a gear shifting gear set in the gearbox; the motor controller is electrically connected with the generator and the first driving motor respectively; and the shock absorber is arranged between the generator and the engine and is connected to an output shaft of the engine.

The invention relates to the technical field of generator silencers, in particular to a mute variable-frequency gasoline engine generator silencer and a production process. Comprising an air inlet assembly, an installation assembly, a front end cover net plate, front end cover cotton, a silencer upper cover, an upper cover net plate, upper cover cotton, a silencer lower cover, a lower cover net plate, lower cover cotton, a front partition plate, a rear partition plate, a front silencing pipe, a plurality of plugs, a rear silencing pipe, a silencer rear end cover, a rear end cover net plate, rear end cover cotton, a silencing bag, silencing bag cotton, a silencing bag net plate and an air outlet pipe. The upper cover cotton is arranged between the silencer upper cover and the upper cover net plate, the lower cover cotton is arranged between the silencer lower cover and the lower cover net plate, the silencer upper cover is fixedly connected with the silencer lower cover, and the front partition plate and the rear partition plate are both connected with the upper cover net plate and the lower cover net plate. In this way, the technical problems that in the prior art, due to the fact that silencing cotton in a silencer is manually added into an interlayer, the number of the added silencing cotton cannot be guaranteed, and the uniformity is poor are solved.

The present application relates to the field of electrical engineering, in particular to a kind of full DC power supply system suitable for pulse load characteristics.The system includes control unit, chassis engine, generator, rectifier unit, energy storage unit and distribution unit;Wherein, rectifier unit uses uncontrolled rectification+BUCK type step-down topology, and constant voltage control strategy, specifically: double-loop control mode of outer ring voltage control+inner ring current control, output DC 600V DC bus is stabilized at set voltage value, realizes the constant voltage control of output voltage.Solve the energy supply problem of equipment single vehicle operation, and the problem that traditional electric car system constant current strategy and equipment pulse load are difficult to match.Using the power supply structure of rectifier unit+energy storage unit (capacitor), remove lithium battery in traditional electric drive system, avoid the safety problem of lithium battery, and the system safety is high.

To provide an engine starting device that has a simple configuration and reduces fuel consumption when starting the engine. [Solution] A starting device 100 for engine E that starts with butane gas 3 and operates normally with kerosene 4, comprising a vacuum valve 8 configured to supply butane gas 3, a carburetor 5 configured to supply kerosene 4, a throttle SV provided on the carburetor 5, and a control device, wherein when starting engine E, the control device controls the opening S of the throttle SV of engine E to opening S1 so that the intake vacuum of engine E acts on the vacuum valve 8 to supply butane gas 3 to engine E, and kerosene 4 is not supplied to the carburetor 5 of engine E, and only butane gas 3 is supplied to the intake pipe 6 of engine E, thereby starting engine E.

A test method of gasoline engine generator set on engine test bench belongs to the technical field of engine test. The general engine test bench is reversibly and modularly transformed. The original power absorption device, the control and measurement industrial computer, the thermal / NVH collection system and the INCA computer are retained. The rectification, power measurement, adjustable electric load and oil consumption instrument device are newly added. The control system is reconstructed in double modes. The generator set test mode is added and the control function of the power absorption device is shielded. The speed / torque closed-loop control logic taking the adjustable electric load as the regulated variable is established. Relying on the synchronous collection of the unified clock, the microsecond time stamp alignment collection of the oil consumption, thermal, power, NVH and AC / DC electric performance of the generator set is realized. The test is carried out by reusing the extreme environment simulation system of the test bench. The transformation is reversible and non-damaging, does not affect the original function, can greatly reduce the equipment investment, improve the utilization rate of the test bench and provide support for the performance optimization of the generator set.

This invention discloses a plug-in independent power supply hybrid power system for aircraft, which can be installed in situ without altering the original aircraft's core structure. The system employs an external independent power battery module, a small-power engine generator, and a small battery module to form a "three-level independent redundant power architecture," with each unit's power supply circuit electrically isolated from the others. The external independent power battery only charges on the ground and discharges unidirectionally during flight, without energy recovery or reverse charging. It only replaces all functions of the flight control system and electronic control system when the engine and small battery fail. The small-power engine does not participate in takeoff and climb, but is dedicated to cruise power supply. The small battery is responsible for powering the flight control system, electronic control system, and engine starter, sharing a high-voltage DC bus with the generator to achieve bus voltage stabilization and short-term power compensation. Ground charging simultaneously performs a full system self-check. When the battery power is insufficient or the test fails, there is no manual bypass, and the electronic control system is forcibly locked, prohibiting engine starting and ensuring absolute flight safety.

Hybrid powertrain (10) for starting and propelling a vehicle (8), comprising: a motor (12); a first motor / generator (14); a second motor / generator (16); and a single-stage, widely branched, electrically variable transmission (18) comprising the following: a drive element (52); a stationary element (54); a gear train (44); a torque transmission device (56); a compound planetary gear assembly (20) comprising a ring gear structure (24), a first sun gear element (26-1, 126-1, 226-1, 326-1), a second sun gear element (26-2, 126-2, 226-2, 326-2), a support structure (28), and a double pinion assembly comprising a first pinion gear (30-1, 130-1, 330-1) meshing with the first sun gear element and a second pinion gear (30-2, 130-2, 330-2) meshing with the first pinion gear (30-1, 130-1, 330-1) and the ring gear structure (24); and a highest numerical translation ratio of approximately 4 to 1 and a lowest numerical translation ratio of approximately 0.7 to 1; where: The composite planetary gear arrangement (20) comprises a first node (32-1), a second node (32-2), a third node (32-3) and a fourth node (32-4), wherein the first, second, third and fourth nodes (32-1, 32-2, 32-3, 32-4) have at least a gear ratio of 3 to 1 between the torque transmission device (56) and the output element (52); the second motor / generator (16) is functionally connected via the transmission train (44) to the compound planetary gear assembly (20) at the first node (32-1); the output element (52) is functionally connected to the composite planetary gear assembly (20) at the second node (32-2); the motor (12) is functionally connected to the composite planetary gear assembly (20) at the third node (32-3); the first motor / generator (14) is functionally connected at the fourth node (32-4) to the composite planetary gear assembly (20); The torque transmission device (56) can be engaged to ground the third node (32-3) to the stationary element (54); and each of the first and second motors / generators (14, 16) uses non-rare earth magnets.

The invention discloses a hybrid power coaxial reversal helicopter transmission system, which belongs to the field of gear transmission and comprises an engine, a generator, a motor, a reversing subsystem, a coaxial reversal subsystem, a tail transmission subsystem and the like. The engine and the generator are connected through the parallel shaft speed reducer and connected to the first reversing subsystem through the friction clutch, and the reversing subsystem is connected to the coaxial reversing subsystem through the duplicate gear. The coaxial reversal subsystem adopts coaxial face gear transmission and comprises an upper face gear, a lower face gear, a left input straight gear, a right input straight gear and an idle gear. The motor is connected to the second reversing subsystem through a parallel shaft speed reducer and then connected to the coaxial reverse subsystem through a duplicate gear. And the power of the engine and the motor is converged through the coaxial reversal subsystem and is supplied to the coaxial reversal rotor wing for flight. And meanwhile, the output power of the motor is connected to the tail rotor through the reversing subsystem. The coaxial face gear transmission is adopted, torque from different power sources can be effectively transmitted to the main rotor wing or the tail rotor wing according to requirements, and better torque distribution is provided.

The utility model relates to the technical field of tractor power assemblies, in particular to an efficient tractor CVT power assembly. Comprising an engine, a generator, a driving motor and a gearbox, the output end of the engine is in transmission connection with a driving shaft, a generator rotor is coaxially and fixedly connected with an input shaft, the end, close to the driving shaft, of the input shaft is in acceleration transmission connection with the driving shaft through a first planetary gear set, and the end, away from the driving shaft, of the input shaft is in transmission connection with a PTO shaft; an output shaft is arranged on the driving motor, and a transmission shaft in transmission fit with the output shaft is arranged on the gearbox. Through the structure, the driving shaft and the generator input shaft are in accelerated transmission through the first planetary gear set, the mode that the driving shaft and the generator input shaft are directly, coaxially and fixedly connected is eliminated, and compared with a transmission power assembly, under the condition that the rotating speed of the driving shaft is the same, the rotating speed of the input shaft in the device is higher; in other words, the power generation efficiency of the generator is higher, and power output by the engine driving shaft is fully utilized.

The utility model provides a gasoline engine generator base fixing device, which relates to the technical field of gasoline engine generators and comprises a base and a mounting frame, connecting cross beams are mounted on two sides in the base, the mounting frame is arranged in the base and located between the two connecting cross beams, and limiting mechanisms are arranged on two sides of the mounting frame. Supporting plates are mounted on the surfaces of the two ends of the mounting frame correspondingly, and through holes are formed in the two sides of the bottom of each supporting plate in a penetrating mode correspondingly. The air cylinder controls the moving plate to move into the groove, the rotary knob is rotated to control the clamping block to move, the clamping block is controlled to penetrate through the through groove to be matched with the clamping groove, the position of the moving plate in the groove can be fixed, and the mounting frame and the two connecting cross beams are connected into a whole through the limiting mechanism. The overall stability of the base can be enhanced, the position of the mounting frame is fixed, after vibration generated in the working process of the generator is transmitted to the base, the base does not deviate, and normal operation of the generator is not affected.

The utility model relates to the technical field of gasoline generators, in particular to a small general gasoline generator air filter which comprises a sealing plate, an upper cover, a first frame body, a second frame body, a base, a guide groove, an abutting frame, a side face air port, a groove, an L-shaped partition plate, an installation groove, a fixing groove, a knob bolt, a through hole and an end face air port. According to the structure, the first frame body and the second frame body are installed and detached in a sliding mode and then fixed through the knob bolt and the sealing plate, when the filter element needs to be replaced, the knob bolt is loosened, the sealing plate is taken down, and finally the second frame body is taken out in a sliding mode. According to the structure, the use number of bolts is reduced, and a sliding installation mode is provided, so that the replacement process of the filter element is simplified.

This invention discloses a method, device, vehicle, and storage medium for protecting a power battery. The method is applied to a vehicle including an engine, generator, power battery, and drive motor. It includes: activating battery protection when the actual power of the power battery is determined to be greater than or equal to a power threshold, and the actual power change rate is greater than or equal to a rate threshold; when the current operating condition is driving acceleration, controlling the generator's speed regulation power to remain constant while reducing the allowable discharge power of the power battery; when the current operating condition is regenerative braking, controlling the generator's speed regulation power to remain constant while reducing the allowable charging power of the power battery. This technical solution, based on the vehicle's current operating condition, enables advance prediction of the power battery's over-discharge and over-charge trends, controls the generator's speed regulation power to remain constant, and simultaneously corrects the allowable discharge and allowable charging power of the power battery, actively reducing the overcharge and over-discharge trends of the power battery, thereby protecting the power battery.

The embodiment of the utility model provides a range extending type power system and a vehicle, and belongs to the technical field of vehicles. The extended-range power system includes: an engine; the input end of the generator is in dynamic coupling connection with the output end of the engine, and the generator is electrically connected with the battery; the driving motor is electrically connected with the battery; the speed reducer is connected with the engine or the driving motor; the speed reducer is mounted on the bearing seat; the engine, the generator, the driving motor, the speed reducer and the bearing seat are mounted on the mounting shell; at least one of the engine, the generator, the driving motor, the speed reducer, the non-moving part of the bearing seat and the mounting shell is provided with a cavity, and a plurality of movable damping particles are arranged in the cavity. According to the embodiment of the invention, vibration and noise generated in the operation process of the extended-range power system can be reduced, and the stability of the system is improved.

A power generation system (11) comprises: information acquisition units (13), (15) that are provided with a mixed combustion engine generator (21) capable of generating power using two or more types of fuels including a first fuel (F1) and a second fuel (F2) and acquire various information including a required generated power amount for power supply and demand adjustment, a first fuel surplus amount (TS1), a second fuel surplus amount (TS2), and the actual operation results of the mixed combustion engine generator (21); a calculation unit (13) that calculates an integrated generated power amount obtained by integrating a first generated power amount and a second generated power amount; and a determination unit (13) that determines the magnitude relationship between the integrated generated power amount and the required generated power amount for power supply and demand adjustment. The control units (13), (15), (23) set an operation mode for the power supply and demand adjustment including a mixed combustion ratio (Rq2) and a power generation output when the integrated generated power amount exceeds the required generated power amount for the power supply and demand adjustment, and perform power generation control related to the mixed combustion engine generator (21) using the set operation mode for the power supply and demand adjustment.

The utility model relates to the technical field of oil tanks, in particular to a breather pipe structure of an oil inlet of an oil tank of a general gasoline engine generator, which comprises an oil tank body, an oil filling pipe and a breather assembly, the oil filling pipe is fixedly connected with the oil tank body and positioned on one side of the oil tank body, and the breather assembly comprises a water accumulation tank, a first air pipe, a second air pipe, a filter component and a drainage component. The water accumulation tank is fixedly connected with the oil tank body and located on one side of the oil tank body, the two ends of the first air pipe are connected with the oil tank body and the water accumulation tank respectively, and the two ends of the second air pipe are connected with the water accumulation tank and the oil filling pipe respectively. The problems that in the prior art, due to the fact that water vapor in oil gas is liquefied when encountering cold, condensed water is formed and exists in a breather pipe, and due to the fact that a drainage mechanism is not arranged in the prior art, the condensed water easily flows into an oil tank to be mixed with oil, the fuel oil quality is reduced, and the generator performance is affected are solved.

The invention provides a P1P3-based series-parallel hybrid power system and a control method, and belongs to the technical field of hybrid electric vehicle power transmission, and the system comprises a generator which is connected with the output end of an engine and is used for converting mechanical energy of the engine into electric energy; the driving motor is used for outputting torque; the speed change mechanism comprises a power input shaft, a power output shaft, at least four planet rows arranged between the power input shaft and the power output shaft and a mode switching mechanism. Power of the generator and the driving motor is coupled through different planet rows in the speed change mechanism and is output through a power output shaft; the mode switching mechanism is used for switching working modes of the speed change mechanism so as to at least realize a pure electric driving mode, an engine direct driving mode and a hybrid driving mode; the control unit is used for controlling operation of the mode switching mechanism, the engine, the generator and the driving motor according to the vehicle operation state. The driving smoothness is improved, the power distribution is optimized, the system complexity is reduced, and the endurance mileage is increased.

The application discloses a kind of algorithm model running drive engine construction method based on knowledge graph, data source, algorithm and model are respectively configured, form data source library, algorithm library and model library, select the data source, algorithm and model needed from library, and arrange according to model running rule, obtain algorithm model running rule graph atlas.Algorithm model running rule graph atlas is parsed as triple text data, triple text data is converted into formal language text, using multi-model interactive behavior verification, if rule is unqualified, then return error prompt information through interactive interface.If it is qualified, then rule text is input into task engine generator, and algorithm model drive engine is generated by generator according to rule text.The application solves the problems of difficult arrangement of algorithm and model running mode in manufacturing environment, complicated management of running rules, low execution efficiency and the like, so as to improve production efficiency and product quality.

The application belongs to the technical field of aero-engine generator design, and particularly relates to an aero-engine built-in double-start generator and a control method thereof, wherein the aero-engine built-in double-start generator adopts a built-in double-start generator structure, reduces the volume of a single start generator, and is designed in a simplified and intensive manner, is shared with a high-pressure bearing force structure, and reduces the design and arrangement complexity of the double generator, in addition, the design is backed up by the double-start generator when being controlled, so that the reliability of starting the aero-engine can be effectively ensured, and the power demand of the aero-engine and the power supply system of the airplane can be met.

The application discloses an automobile driving system, which comprises a driving shell assembly, a controller assembly and a transmission assembly, wherein the transmission assembly comprises an engine, a generator, a driving motor and a speed reducer; the driving shell assembly comprises a main shell, a front end cover, a rear end cover and an upper cover; the main shell comprises a controller cavity, a gear cavity, a driving motor cavity and a generator cavity; the driving motor cavity and the generator cavity are located on the same side; the gear cavity is located on the opposite side of the driving motor cavity and the generator cavity; the controller cavity is located above the generator cavity and the gear cavity; the upper cover covers the controller cavity; the rear end cover covers the rear side of the driving motor cavity and the generator cavity; the speed reducer is installed in the gear cavity; the front end cover covers the front side of the gear cavity; the engine is located outside the driving shell assembly; and the engine input shaft penetrates into the front end cover and is connected with the speed reducer. The automobile driving system is highly integrated, the overall structure is compact, and the automobile driving system occupies a small space.

The utility model relates to the technical field of range extender engines, in particular to a range extender capable of improving reliability and reducing oil consumption and a range-extended vehicle. The range extender comprises an engine, a generator and a front end wheel train. The generator and the front-end wheel train are arranged at the two axial ends of a crankshaft of the engine respectively, the front-end wheel train is provided with a transmission wheel set and a crankshaft position sensor, and one belt pulley of the transmission wheel set is provided with a signal gear ring. In the application, any belt pulley in the transmission wheel set of the front wheel train is provided with the signal gear ring, and the crankshaft position sensor is aligned with the signal gear ring to detect the rotation state of the crankshaft. Therefore, on the basis that a flywheel shell structure is omitted, the signal gear ring and the front-end gear train are combined, so that the original axial length is kept, and the problem that the crankshaft position sensor is interfered by the generator is solved.

The invention discloses a hybrid power system, a control method, a vehicle-mounted controller, a control system and an automobile. The system comprises an engine, a generator, a driving motor, a first transmission assembly, a second transmission assembly and a wheel end transmission assembly. The engine is connected with the generator through a first transmission shaft. The driving motor is connected with the wheel end transmission assembly through a second transmission shaft. The wheel end transmission assembly is used for being connected with wheels. The first transmission assembly is arranged between the first transmission shaft and the second transmission shaft, and a first clutch is arranged on the first transmission assembly; the second transmission assembly is arranged between the first transmission shaft and the second transmission shaft, and a second clutch is arranged on the second transmission assembly; the first transmission assembly and the second transmission assembly are different in speed ratio. According to the system, parallel hybrid driving of two gears can be achieved, a wider speed ratio selection range can be provided, an engine can more reasonably operate in a high-efficiency interval, and the dynamic property and economical efficiency of the whole vehicle are improved.

The invention provides a gearbox matching method and device, electronic equipment and a storage medium. The gearbox matching method comprises the steps that at least one piece of engine MAP data and at least one piece of generator MAP data are acquired; according to the at least one engine MAP data and the at least one generator MAP data, generating at least one gearbox MAP; and according to the at least one gearbox MAP, an engine and a generator which meet preset conditions are determined to form a target gearbox, so that the target gearbox outputs high generating capacity at a low fuel consumption rate. It can be understood that through the method provided by the embodiment of the invention, the matching effect of the engine and the generator can be visually checked, so that the generating capacity result of different engine-generator combinations can be quickly obtained, the matching result of the engine and the generator can be quickly obtained, the construction period is shortened, and the working efficiency is improved.

The invention discloses a heat dissipation structure for an eddy current system and an aircraft, the eddy current system comprises an engine, a generator and a controller, the heat dissipation structure comprises a supporting structure, the supporting structure is used as a structure support and divides a power cabin into a cold end side and a hot end side, a cold end part of the engine is arranged on the cold end side, a hot end part of the engine is arranged on the hot end side, and the supporting structure is used for supporting the engine; the controller is arranged on the cold end side; the lubricating oil system is arranged on the cold end side and used for leading lubricating oil as cooling liquid to the controller, the engine and the generator and returning the lubricating oil; the air inlet system is arranged in the power cabin and is used for introducing external air into the power cabin; the air cooling channel is arranged at the bottom of the power cabin and used for feeding air from the front end of the power cabin and exhausting air from the rear end of the power cabin, and the heat dissipation structure of the lubricating oil system is arranged in the air cooling channel; a fan is arranged in the air cooling channel and used for adjusting the rotating speed in a matched mode according to the temperature of the lubricating oil in the heat dissipation structure or the temperature of the lubricating oil entering the heat dissipation structure so that the temperature of the lubricating oil in the heat dissipation structure can be within a preset range.

The present invention improves the portability of an engine generator / welder equipped with a compressor, and improves the maintainability of the compressor.　An engine generator / welder equipped with a compressor comprises: an engine; a power generator driven by the engine; the compressor for using compressed air; a first housing accommodating the engine and the power generator; and a second housing accommodating the compressor. The first housing has a connection space for detachably connecting the second housing.

The application provides a hydraulic motor control circuit, which comprises a hydraulic motor, an engine generator and a battery power supply group, and further comprises a first relay, a second relay and a contactor; the contact of the contactor is attracted or disconnected to control the start or stop of the hydraulic motor; the contact of the second relay is attracted or disconnected to control the contact of the contactor; the contact of the first relay is attracted or disconnected to control the contact of the second relay; when the engine generator is not working, the contact of the first relay is attracted under the action of the battery power supply group, the contact of the second relay is disconnected, the contact of the contactor is disconnected, and the hydraulic motor cannot work; when the engine generator is working, the first relay opens the overvoltage protection, the contact of the first relay is disconnected, the contact of the second relay is attracted, the contact of the contactor is attracted, and the hydraulic motor is powered and starts to work. The application can ensure that the hydraulic motor does not excessively consume the battery power.