CN115534655A - Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof - Google Patents

Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof Download PDF

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Publication number
CN115534655A
CN115534655A CN202211158343.1A CN202211158343A CN115534655A CN 115534655 A CN115534655 A CN 115534655A CN 202211158343 A CN202211158343 A CN 202211158343A CN 115534655 A CN115534655 A CN 115534655A
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China
Prior art keywords
hydraulic
energy
pump motor
power assembly
auxiliary power
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CN202211158343.1A
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Chinese (zh)
Inventor
付胜杰
王岗宇
任好玲
缪骋
林添良
郭桐
陈其怀
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Huaqiao University
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Huaqiao University
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Priority to CN202211158343.1A priority Critical patent/CN115534655A/en
Publication of CN115534655A publication Critical patent/CN115534655A/en
Pending legal-status Critical Current

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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
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • 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
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

The invention provides an oil hybrid vehicle and a walking engineering machinery oil hybrid power system thereof, wherein when the system is in a braking working condition, an electric type based on a motor generator, a hydraulic type based on a pump motor and a combined type based on the motor generator and the pump motor are used for recovering walking braking energy, so that the large-range efficient recovery of the braking energy is realized, and the recovery efficiency of the braking energy is improved; when the system is in a driving working condition, power is provided in various forms of engine independent driving, pump motor independent driving, motor generator-pump motor independent driving, engine-pump motor combined driving, engine-motor generator-pump motor combined driving and the like, the use of the engine is reduced through various independent driving modes, and the engine stably runs in an economic working condition for a long time in various combined driving modes, so that the fuel economy of the whole vehicle is improved, and the energy-saving and emission-reducing effects are remarkable.

Description

Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof
Technical Field
The invention relates to the technical field of hybrid power systems of walking driving engineering machinery, in particular to an oil hybrid power vehicle and an oil hybrid power system of the walking engineering machinery thereof.
Background
When heavy-duty traveling engineering machinery runs under urban roads, because the whole machine is heavy in mass, large in installed power and frequent in starting and stopping, an engine is always in a low-load running state, fuel consumption is high, emission performance is poor, and meanwhile, a large amount of traveling braking kinetic energy negative loads are wasted in a heat energy form; therefore, the vehicle running driving system on the market has a start-stop system and a braking energy recovery system, the hybrid power system has an energy storage unit, a foundation is laid for energy recovery of a negative braking kinetic energy load of the running engineering machinery, and the oil hybrid power technology has the characteristics of high power density and rapid charging and discharging energy, and becomes the most effective way for realizing mechanical braking energy recovery of the running engineering machinery at present.
In the existing oil-liquid hybrid power technology, when no pressure energy exists in a high-pressure energy accumulator, a pure hydraulic starting function cannot be realized under the condition of low speed of a vehicle, and the normal operation of the vehicle is seriously influenced; in addition, the recovered braking energy in the hydraulic system can only be applied to the low-speed pure hydraulic starting function of the vehicle, and when the recovered braking energy reaches the highest pressure of the high-pressure energy accumulator, the redundant braking energy cannot be applied to a working device of the engineering machinery, so that waste is caused. In short, the existing oil hybrid power technology development is limited by the technical bottleneck of a hydraulic energy accumulator, the installed power level of a vehicle is not easy to reduce, the cost is high, the hydraulic transmission efficiency is low, the leakage and pollution of hydraulic oil are avoided, and the walking braking energy recovery efficiency is low because the hydraulic energy accumulator is low in energy density and limited in installation space and the energy storage space cannot recover more energy; meanwhile, the oil-liquid hybrid power system cannot stably adjust the economic operation of the engine for a long time due to limited energy storage, cannot reduce the power level of the engine, and has poor energy-saving and emission-reducing effects.
In view of this, the present application is proposed.
Disclosure of Invention
In view of the above, the present invention provides an oil hybrid vehicle and an oil hybrid system of a traveling engineering machine thereof, which can effectively solve the problem that the traveling braking energy recovery efficiency is low in the prior art because the hydraulic energy accumulator has low energy density and limited installation space and the energy storage space is limited and cannot recover more energy.
The invention provides an oil-liquid hybrid power system of walking engineering machinery, which comprises a vehicle control unit, a power coupling assembly, a main power assembly, a second clutch, a first auxiliary power assembly and a second auxiliary power assembly, wherein the main power assembly is connected with the second clutch;
the output shaft of the main power assembly is connected with the input shaft of the power coupling assembly, the first auxiliary power assembly is connected with the input shaft pipeline of the power coupling assembly through the second clutch, the first auxiliary power assembly is connected with the second auxiliary power assembly in parallel, the output end of the vehicle control unit is electrically connected with the control end of the main power assembly, the control end of the first auxiliary power assembly and the control end of the second auxiliary power assembly, and the input end of the vehicle control unit is used for being electrically connected with a pedal of a walking engineering machine and a sensor of the walking engineering machine;
wherein the vehicle control unit is configured to implement the following steps by executing a computer program stored therein:
when the system is detected to be in a braking state, acquiring the SOC value of a hydraulic energy accumulator and the SOC value of a storage battery of the walking engineering machinery in real time, respectively comparing the SOC value of the hydraulic energy accumulator and the SOC value of the storage battery with corresponding preset values, and generating a comparison result;
when the comparison result shows that only the hydraulic energy accumulator is in the state of energy recovery, the first auxiliary power assembly is controlled to convert the braking energy generated by the power coupling assembly into hydraulic energy and store the hydraulic energy;
when the situation that only the storage battery is in the state of energy recovery is judged according to the comparison result, the first auxiliary power assembly and the second auxiliary power are controlled to convert the braking energy generated by the power coupling assembly into electric energy and store the electric energy;
when the hydraulic energy accumulator and the storage battery are judged to be in the energy recovery available state according to the comparison result, the first auxiliary power assembly is controlled to convert the braking energy generated by the power coupling assembly into hydraulic energy and store the hydraulic energy, and when the hydraulic energy accumulator is detected to be completely recovered according to the SOC value of the hydraulic energy accumulator, the first auxiliary power assembly and the second auxiliary power assembly are controlled to convert the braking energy generated by the power coupling assembly into electric energy and store the electric energy.
Preferably, the method further comprises the following steps:
when the system is detected to be in a driving state, acquiring the SOC value of a hydraulic energy accumulator and the SOC value of a storage battery of the walking engineering machinery in real time, respectively comparing the SOC value of the hydraulic energy accumulator and the SOC value of the storage battery with corresponding preset values, and generating a comparison result;
when the comparison result is judged that only the hydraulic accumulator is in the releasable state, controlling the first auxiliary power assembly to drive the power coupling assembly to rotate;
when only the storage battery is judged to be in a dischargeable state according to the comparison result, the second auxiliary power assembly is controlled to drive the power coupling assembly to rotate;
and when the hydraulic accumulator is judged not to be in a dischargeable state and the storage battery is judged not to be in a dischargeable state according to the comparison result, the main power assembly is controlled to drive the power coupling assembly to rotate.
Preferably, the power coupling assembly comprises a torque coupler, a gearbox, a drive axle, and drive wheels;
an output shaft of the main power assembly is connected with an input shaft of the torque coupler, a first output shaft of the torque coupler is connected with an input shaft of the gearbox, a second output shaft of the torque coupler is connected with an input shaft of the first auxiliary power assembly, an output shaft of the gearbox is connected with the drive axle, and the drive axle is connected with the driving wheel.
Preferably, the vehicle control system further comprises a brake device configured on the driving wheel, and the output end of the vehicle control unit is electrically connected with the control end of the brake device.
Preferably, the main power assembly comprises an engine and a first clutch, an output shaft of the engine is connected with an input shaft of the torque coupler through the first clutch, and an output end of the vehicle control unit is electrically connected with a control end of the first clutch.
Preferably, the first auxiliary power assembly comprises a second clutch, a second hydraulic pump motor, a hydraulic oil tank, a one-way valve, a two-position two-way electromagnetic directional valve and a hydraulic accumulator;
the second output shaft of the torque coupler is connected with the second hydraulic pump motor through the second clutch, the low-pressure oil path of the second hydraulic pump motor is connected with the hydraulic oil tank, the high-pressure oil path of the second hydraulic pump motor is connected with the hydraulic accumulator through the two-position two-way electromagnetic directional valve and the one-way valve, the second hydraulic pump motor and the second auxiliary power assembly are connected in parallel, and the output end of the whole vehicle controller is electrically connected with the control end of the second clutch, the control end of the second hydraulic pump motor and the control end of the two-position two-way electromagnetic directional valve.
Preferably, the second auxiliary power assembly includes a first hydraulic pump motor, a motor generator, and a storage battery, the first hydraulic pump motor is coaxially connected with the motor generator, the motor generator is electrically connected with the storage battery, and an output end of the vehicle control unit is electrically connected with a control end of the first hydraulic pump motor.
Preferably, the hydraulic pump further comprises a first overflow valve, a first interface of the first overflow valve is connected with the hydraulic oil tank, and a second interface of the first overflow valve is connected with the second hydraulic pump motor.
Preferably, the hydraulic control system further comprises a second overflow valve, a first interface of the second overflow valve is connected with the hydraulic oil tank, and a second interface of the first overflow valve is connected with the hydraulic accumulator.
The invention also provides an oil hybrid power vehicle which comprises a vehicle body and the oil hybrid power system of the walking engineering machinery, wherein the oil hybrid power system of the walking engineering machinery is configured on the vehicle body.
In summary, the oil hybrid vehicle and the oil hybrid power system of the traveling engineering machinery thereof provided by the embodiment can efficiently recover braking energy in a large range through a reasonable energy recovery strategy in a braking working condition; in the driving working condition, the use of the engine can be reduced or the operation of the engine at an economic working point can be stably adjusted for a long time through a reasonable driving strategy, the fuel economy of the whole vehicle is greatly improved, and the energy-saving and emission-reducing effects are obvious; therefore, the problem that the walking braking energy recovery efficiency is low in the prior art because the hydraulic energy accumulator is low in energy density and limited in installation space and the energy storage space is limited and more energy cannot be recovered in the oil-liquid hybrid power system is solved.
Drawings
Fig. 1 is a schematic structural diagram of an oil-liquid hybrid power system of a traveling engineering machine according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Referring to fig. 1, a first embodiment of the present invention provides an oil-liquid hybrid power system for a traveling engineering machine, including a vehicle control unit 19, a power coupling assembly, a main power assembly, a second clutch 8, a first auxiliary power assembly, and a second auxiliary power assembly;
the output shaft of the main power assembly is connected with the input shaft of the power coupling assembly, the first auxiliary power assembly is connected with the input shaft pipeline of the power coupling assembly through the second clutch 8, the first auxiliary power assembly is connected with the second auxiliary power assembly in parallel, the output end of the vehicle control unit 19 is electrically connected with the control end of the main power assembly, the control end of the first auxiliary power assembly and the control end of the second auxiliary power assembly, and the input end of the vehicle control unit 19 is used for being electrically connected with a pedal of a walking engineering machine and a sensor of the walking engineering machine;
wherein the vehicle control unit 19 is configured to implement the following steps by executing a computer program stored therein:
when the system is detected to be in a braking state, acquiring the SOC value of a hydraulic energy accumulator and the SOC value of a storage battery of the walking engineering machinery in real time, respectively comparing the SOC value of the hydraulic energy accumulator and the SOC value of the storage battery with corresponding preset values, and generating a comparison result;
when judging that only the hydraulic energy accumulator is in an energy recovery available state according to the comparison result, controlling the first auxiliary power assembly to convert the braking energy generated by the power coupling assembly into hydraulic energy and store the hydraulic energy;
when the comparison result shows that only the storage battery is in the energy recovery available state, controlling the first auxiliary power assembly and the second auxiliary power assembly to convert the braking energy generated by the power coupling assembly into electric energy and store the electric energy;
when the hydraulic energy accumulator and the storage battery are judged to be in the state capable of energy recovery according to the comparison result, the first auxiliary power assembly is controlled to convert the braking energy generated by the power coupling assembly into hydraulic energy and store the hydraulic energy, and when the fact that the energy recovery of the hydraulic energy accumulator is finished is detected according to the SOC value of the hydraulic energy accumulator, the first auxiliary power assembly and the second auxiliary power assembly are controlled to convert the braking energy generated by the power coupling assembly into electric energy and store the electric energy.
The development of the oil hybrid power technology on the current market is limited by the technical bottleneck of a hydraulic energy accumulator, the installed power level of a vehicle is not easy to reduce, the cost is high, the hydraulic transmission efficiency is low, the leakage pollution of hydraulic oil is avoided, and the like; meanwhile, the oil hybrid power system cannot stably adjust the economic operation of the engine for a long time due to limited energy storage, cannot reduce the power level of the engine, and has poor energy-saving and emission-reducing effects.
Specifically, in this embodiment, the vehicle control unit 19 controls the element states of the oil hybrid power system of the traveling engineering machinery, so as to ensure that the oil hybrid power system of the traveling engineering machinery can operate smoothly; and the vehicle control unit 19 acquires and processes signals such as a feedback rotating speed and a feedback torque signal of the motor generator controller, a feedback rotating speed and a feedback torque signal of the engine controller, a gear signal of a gearbox, a clutch pedal opening signal, an accelerator pedal opening signal, a brake pedal opening signal, a pressure feedback signal of a pressure sensor of a hydraulic system, an SOC signal of a hydraulic accumulator, an SOC signal of a storage battery and the like, identifies the working mode of the whole vehicle and autonomously switches to a proper working condition. The power or torque of different power sources is reasonably distributed according to the whole vehicle control strategy, and the vehicle-mounted energy is optimized, so that the efficiency of the whole vehicle system is highest; meanwhile, the regenerative braking energy of the vehicle is recycled and utilized as much as possible, so that the engine always works in the high-efficiency working range of the engine, the fuel consumption of the whole vehicle is reduced, and the emission of waste gas is reduced. The vehicle control unit 19 executes a formulated control strategy, and sends control signals to the motor controller, the engine controller, the two-position two-way electromagnetic directional valve, the second clutch, the first hydraulic pump motor, the second hydraulic pump motor and the like, so that the running states of all components are controlled, the smooth running of the oil-liquid hybrid power system is ensured, and various driving and braking working modes are realized.
In this embodiment, the oil-liquid hybrid power system for the traveling engineering machinery structurally comprises a first main power unit, namely an engine, a second auxiliary power unit, namely a hydraulic pump motor, and a third auxiliary power unit, namely a motor generator, wherein energy sources of the first main power unit, the second auxiliary power unit and the third auxiliary power unit are respectively an oil tank, a hydraulic accumulator and a storage battery, and the system is further provided with a power type energy storage unit, a hydraulic accumulator and an energy type energy storage unit storage battery; when the oil-liquid hybrid power system of the walking engineering machinery is in a braking working condition, the electric type based on the motor generator, the hydraulic type based on the hydraulic pump motor and the combined type based on the motor generator and the hydraulic pump motor are used for recovering the walking braking energy, so that the large-range efficient recovery of the braking energy is realized, and the recovery efficiency of the braking energy is greatly improved. Simply speaking, the system has high energy recovery efficiency, the auxiliary power source can stably output power for a long time, the economic working point of the engine is stabilized in a peak clipping and valley filling mode, the fuel economy, the dynamic property, the controllability and other vehicle performances of the whole vehicle are greatly improved, and the energy-saving and emission-reducing effects are obvious; meanwhile, the system is safe and reliable, can efficiently recover braking energy in a large range, has high energy recovery efficiency, can stably adjust the economic operation of the engine for a long time, greatly improves the fuel economy of the vehicle, and has obvious energy-saving and emission-reducing effects. The problem of current fluid hybrid technology because of hydraulic accumulator energy storage unit energy density is low and lead to the fact the energy storage to be few and can not stably adjust engine operating point economic operation is solved to a certain extent.
In the embodiment, the hydraulic energy accumulator has high power density and is preferentially used when the vehicle starts, so that hydraulic energy recovery and electric auxiliary braking energy recovery are preferentially performed in the braking energy recovery process, and the walking engineering machinery oil-liquid hybrid power system can perform energy conversion only by controlling the first auxiliary power component to work when hydraulic energy is recovered; and when the braking energy is recovered electrically, the second auxiliary power assembly still needs the first auxiliary power assembly to provide energy, at this moment, the system needs to control the first auxiliary power assembly and the second auxiliary power assembly to work simultaneously so as to perform energy conversion, and the hydraulic energy accumulator of the first auxiliary power assembly cannot be fully stored for one-time energy recovery, so that the energy of the system is wasted to a certain extent.
In one possible embodiment of the present invention, the method further comprises:
when the system is detected to be in a driving state, acquiring the SOC value of a hydraulic energy accumulator and the SOC value of a storage battery of the walking engineering machinery in real time, respectively comparing the SOC value of the hydraulic energy accumulator and the SOC value of the storage battery with corresponding preset values, and generating a comparison result;
when the comparison result shows that only the hydraulic energy accumulator is in the releasable state, controlling the first auxiliary power assembly to drive the power coupling assembly to rotate;
when the comparison result is judged that only the storage battery is in a dischargeable state, the second auxiliary power assembly is controlled to drive the power coupling assembly to rotate;
and when the hydraulic accumulator is judged not to be in a dischargeable state and the storage battery is judged not to be in a dischargeable state according to the comparison result, the main power assembly is controlled to drive the power coupling assembly to rotate.
Specifically, in this embodiment, when the oil-liquid hybrid power system of the traveling engineering machinery is in a driving working condition, the power is provided in various forms such as engine independent driving, hydraulic pump motor independent driving, motor generator-hydraulic pump motor independent driving, engine-hydraulic pump motor combined driving, engine-motor generator-hydraulic pump motor combined driving, and the like, and the use of the engine and the various combined driving modes are reduced through the various independent driving modes to realize that the engine stably runs in an economic working condition for a long time, so that the fuel economy of the whole vehicle is greatly improved, and the energy saving and emission reduction effects are remarkable.
In one possible embodiment of the invention, the power coupling assembly comprises a torque coupling 3, a gearbox 4, a drive axle 5, and drive wheels 7;
an output shaft of the main power assembly is connected with an input shaft of the torque coupler 3, a first output shaft of the torque coupler 3 is connected with an input shaft of the gearbox 4, a second output shaft of the torque coupler 3 is connected with an input shaft of the first auxiliary power assembly, an output shaft of the gearbox 4 is connected with the drive axle 5, and the drive axle 5 is connected with the drive wheel 7.
Specifically, in the present embodiment, the torque coupler 3 may be a gear type torque coupler, which may be simply understood as a clutch, but the principle structure of the gear type torque coupler is more complicated compared to that of a common clutch. The transmission 4, the transaxle 5, and the driving wheels 7 can be regarded as a power train, which is a device for transmitting power between a power source such as an engine and the driving wheels of an automobile, and the power train basically functions to receive the power of the engine and transmit the power to the driving wheels, and in addition, to increase the torque from the engine; reducing the rotational speed of the engine output; changing the rotation direction of the output rotation speed of the engine; cutting off the transmission of engine power to the driving wheels. It should be noted that, in other embodiments, other types of torque couplers may be used, which are not specifically limited herein, but these schemes are all within the protection scope of the present invention.
In a possible embodiment of the present invention, the present invention further includes a braking device 6 disposed on the driving wheel 7, and an output end of the vehicle control unit 19 is electrically connected to a control end of the braking device 6.
Specifically, in the present embodiment, the brake device 6 generates friction between the brake pad and the wheel drum or the disc, and converts kinetic energy of the vehicle during driving into heat energy to be consumed in the friction process.
In one possible embodiment of the present invention, the main power assembly includes an engine 1 and a first clutch 2, an output shaft of the engine 1 is connected with an input shaft of the torque coupler 3 through the first clutch 2, and an output end of the vehicle control unit 19 is electrically connected with a control end of the first clutch 2.
In one possible embodiment of the invention, the first auxiliary power assembly comprises a second clutch 8, a second hydraulic pump motor 9, a hydraulic oil tank 10, a one-way valve 12, a two-position two-way electromagnetic directional valve 13, and a hydraulic accumulator 15;
the second output shaft of the torque coupler 3 is connected with the second hydraulic pump motor 9 through the second clutch 8, the low-pressure oil path of the second hydraulic pump motor 9 is connected with the hydraulic oil tank 10, the high-pressure oil path of the second hydraulic pump motor 9 is connected with the hydraulic accumulator 15 through the two-position two-way electromagnetic directional valve 13 and the one-way valve 12, the second hydraulic pump motor 9 and the second auxiliary power component are connected in parallel, and the output end of the vehicle control unit 19 is electrically connected with the control end of the second clutch 8, the control end of the second hydraulic pump motor 9 and the control end of the two-position two-way electromagnetic directional valve 13.
In one possible embodiment of the present invention, the second auxiliary power assembly includes a first hydraulic pump motor 16, a motor generator 17, and a battery 18, the first hydraulic pump motor 16 is coaxially connected to the motor generator 17, the motor generator 17 is electrically connected to the battery 18, and an output terminal of the vehicle control unit 19 is electrically connected to a control terminal of the first hydraulic pump motor 16.
Specifically, in the present embodiment, the first hydraulic pump motor 16 and the second hydraulic pump motor 9 may be variable displacement hydraulic pump motors. When the second hydraulic pump motor 9 is in a pump working condition, hydraulic oil output by the hydraulic pump flows into the hydraulic accumulator 15 through the check valve 12, and the hydraulic accumulator 15 is charged; the hydraulic oil output by the hydraulic pump may also directly supply oil to the first hydraulic pump motor 16, and at this time, the first hydraulic pump motor 16 operates under the motor operating condition. When the second hydraulic pump motor 9 is in a motor working condition, the two-position two-way electromagnetic directional valve 13 is opened, and the hydraulic accumulator 15 is connected to a main oil way to supply high-pressure oil to the hydraulic motor, which is a discharging process of the hydraulic accumulator 15.
When the first hydraulic pump motor 16 is in a pump working condition, hydraulic oil output by the hydraulic pump flows into the hydraulic accumulator 15 through the one-way valve 12; the hydraulic oil output by the hydraulic pump can also be directly supplied to the second hydraulic pump motor 9, and at this time, the second hydraulic pump motor 9 operates under the motor working condition. When the first hydraulic pump motor 16 is in the motor operating mode, the motor generator 17 is directly driven to operate in the generator operating mode, and the generator charges the storage battery 18. When the motor generator 17 is in the motor operating mode, the first hydraulic pump motor 16 is directly driven to operate in the pump operating mode, which is a discharging process of the battery 18. It should be noted that, in other embodiments, other types of the first hydraulic pump motor and the second hydraulic pump motor may also be adopted, which is not limited herein, but these solutions are all within the protection scope of the present invention.
In this embodiment, when the oil-hydraulic hybrid power system of the traveling construction machine brakes, the engine 1 stops operating, the first clutch 2 is disengaged, the transmission 4 is in any gear, the second clutch 8 is engaged, and the second hydraulic pump motor 9 is connected to the power train through the torque coupler 3 to start operating in a pump working condition; the first hydraulic pump motor 16 runs under the working condition of a motor, the motor generator 17 is directly driven to run under the working condition of a generator, the hydraulic accumulator 15 is charged with energy and the storage battery 18 is charged, and the recovery of the vehicle walking braking energy is realized. When the oil-liquid hybrid power system of the walking engineering machinery is driven, the engine 1 starts to work, the first clutch 2 is combined, and the torque coupler 3 is connected into a transmission system; the second clutch 8 is combined, the second hydraulic pump motor 9 is connected into a transmission system through the torque coupler 3, the gearbox 4 is located at a certain gear, the motor generator 17 operates under the working condition of a motor to drive the first hydraulic pump motor 16 to operate under the working condition of a pump, the second hydraulic pump motor 9 operates under the working condition of a motor, the hydraulic accumulator 15 discharges energy and the storage battery 18 discharges energy, and the release of the recovered vehicle walking brake energy is achieved.
The specific working principle of the invention is as follows:
when the oil-liquid hybrid power system of the walking engineering machinery brakes, the braking force is provided by mechanical friction braking and hydraulic regenerative braking, and when the hydraulic regenerative braking participates in the braking process, the walking braking energy of the vehicle can be recovered. In the braking process of the vehicle, regenerative braking is preferentially carried out for energy recovery, mechanical friction braking is used for assisting braking, and the mechanical friction braking is directly carried out under the emergency braking condition, and the regenerative braking does not participate in the regenerative braking.
Firstly, recovering energy of the hydraulic energy accumulator alone, monitoring the SOC value of the hydraulic energy accumulator 15 by the vehicle control unit 19, and recovering hydraulic energy when the monitored SOC value is in a recoverable state; the vehicle control unit 19 collects and processes the opening degree signal of the brake pedal, determines the braking torque required by the vehicle and reasonably distributes the braking torque; the vehicle control unit 19 controls the second clutch 8 to be combined, the torque coupler 3 is connected to a transmission system, the torque of the driving wheel 7 passes through the driving axle 5, the gearbox 4, the torque coupler 3 and the second clutch 8 to drive the second hydraulic pump motor 9 to operate in a pump working condition, the hydraulic pump sucks oil from the hydraulic oil tank 10 and outputs hydraulic oil to flow into the hydraulic energy accumulator 15 through the one-way valve 12, and meanwhile regenerative braking torque is generated to decelerate the driving wheel 7, so that the kinetic energy of the vehicle is converted into hydraulic energy in the hydraulic energy accumulator 15, and the braking energy recovery process is completed. The vehicle control unit 19 controls the hydraulic pump to be in the maximum displacement, provides the maximum braking torque and rapidly recovers the braking energy, and the insufficient braking force is supplemented by mechanical friction braking, so that the braking safety is ensured.
Secondly, the storage battery is used for energy recovery alone, the vehicle control unit 19 monitors the SOC value of the storage battery 18, and when the monitored SOC value is in a recoverable state, electric energy recovery is carried out; the vehicle control unit 19 collects and processes the opening degree signal of the brake pedal, determines the braking torque required by the vehicle and reasonably distributes the braking torque; the vehicle control unit 19 controls the second clutch to be combined, the torque coupler 3 is connected to a transmission system, the torque of the driving wheel 7 passes through the drive axle 5, the gearbox 4, the torque coupler 3 and the second clutch 8 to drive the second hydraulic pump motor 9 to operate under a pump working condition, the hydraulic pump sucks oil from the hydraulic oil tank 10 and outputs hydraulic oil to be supplied to the first hydraulic pump motor 16 to operate under a motor working condition, and the hydraulic motor drives the motor generator 17 to operate under a generator working condition so as to charge the storage battery 18. The hydraulic pump generates regenerative braking torque to decelerate the drive wheel 7 so that the kinetic energy of the vehicle is converted into electric energy in the battery 18, completing the braking energy recovery process.
And finally, recovering the composite energy of the hydraulic energy accumulator and the storage battery, wherein the vehicle control unit 19 monitors the SOC value of the hydraulic energy accumulator 15 and the SOC value of the storage battery 18, and performs hydraulic-electric composite energy recovery when the monitored SOC value is in a recoverable state. And the vehicle control unit 19 acquires and processes the opening degree signal of the brake pedal, determines the braking torque required by the vehicle and reasonably distributes the braking torque. The vehicle control unit 19 controls the second clutch 8 to be combined, the torque coupler 3 is connected into a transmission system, and the vehicle control unit 19 controls the displacement of the first hydraulic pump motor 16 and the displacement of the second hydraulic pump motor 9; the torque of the driving wheel 7 drives the second hydraulic pump motor 9 to operate under a pump working condition through the driving axle 5, the gearbox 4, the torque coupler 3 and the second clutch 8, and the hydraulic pump sucks oil from the hydraulic oil tank 10 and outputs hydraulic oil to flow into the hydraulic accumulator through the one-way valve 12 to perform hydraulic energy recovery; the hydraulic pump sucks oil from the hydraulic oil tank and outputs hydraulic oil to be supplied to the first hydraulic pump motor 16 to operate under a motor working condition, the hydraulic motor drives the motor generator 17 to operate under a generator working condition, the storage battery 18 is charged, electric energy recovery is carried out, and hydraulic energy recovery and electric energy recovery are carried out synchronously.
When walking engineering machine tool fluid hybrid power system drives, drive power by engine 1 second hydraulic pump motor 9 the three power pack of motor generator 17 provides, wherein second hydraulic pump motor 9 with when motor generator 17 participated in the driving process, can carry out the release that the system has retrieved energy, and in the system driving process, the priority auxiliary power source provides power, reduces engine 1's use or avoid engine 1 works in the inefficiency district, does benefit to energy saving and emission reduction.
Firstly, the engine is driven independently, when the engine 1 is driven independently, the first clutch 2 is controlled to be combined through a clutch pedal, the torque of the engine 1 drives the driving wheel 7 to rotate through the first clutch 2, the torque coupler 3, the gearbox 4 and the driving axle 5, and the vehicle runs. The independent driving process of the engine 1 is the same as that of a traditional vehicle, and no energy-saving and emission-reducing effect is achieved; however, in the process of driving the engine 1 alone, the surplus power of the engine 1 can be recovered by a hydraulic regeneration system and stored in the hydraulic accumulator 15, so that the energy utilization rate is improved.
Secondly, the second hydraulic pump motor is driven independently, the vehicle control unit 19 monitors the SOC value of the hydraulic energy accumulator 15, after the SOC value is monitored to be in a dischargeable state, the vehicle control unit 19 collects and processes an opening signal of an accelerator pedal, and when it is determined that the regenerated driving force meets the driving force required by the vehicle, the second hydraulic pump motor 9 is driven independently. The vehicle control unit 19 controls the second clutch 8 to be combined, the torque coupler 3 is connected into a transmission system, the vehicle control unit 19 controls the two-position two-way electromagnetic directional valve 13 to be opened, hydraulic oil in the hydraulic energy accumulator 15 is supplied to the second hydraulic pump motor 9 through the two-position two-way electromagnetic directional valve 13 to run under a motor working condition, and the torque of the hydraulic motor passes through the second clutch 8, the torque coupler 3, the gearbox 4 and the drive axle 5 to drive the drive wheel 7 to rotate, so that the vehicle runs. In the process of independently driving the second hydraulic pump motor 9, the engine 1 does not work, and the vehicle achieves the effects of energy conservation and emission reduction.
And thirdly, the motor generator is driven independently, the vehicle control unit 19 monitors the SOC value of the storage battery 18, after the SOC value is monitored to be in a dischargeable state, the vehicle control unit 19 collects and processes an opening degree signal of an accelerator pedal, and when the regenerated driving force is determined to meet the driving force required by the vehicle, the motor generator 17 is driven independently. The vehicle control unit 19 controls the second clutch 8 to be combined, the torque coupler 3 is connected to a transmission system, the storage battery 18 discharges electricity to the motor generator 17 to operate under the working condition of a motor, the torque of the motor passes through the first hydraulic pump motor 16, the second hydraulic pump motor 9, the second clutch 8, the torque coupler 3, the gearbox 4 and the drive axle 5 to drive the drive wheel 7 to rotate, and the vehicle travels. In the process of driving the motor generator 17 independently, the first hydraulic pump motor 16 and the second hydraulic pump motor 9 are used as electric-hydraulic-energy conversion units, while the engine 1 does not work, so that the vehicle achieves the effects of energy conservation and emission reduction.
Finally, the combined drive includes the engine 1-the second hydraulic pump motor 9 combined drive, the engine 1-the motor generator 17-the first hydraulic pump motor 16-the second hydraulic pump motor 9 combined drive, and the motor generator 17-the first hydraulic pump motor 16-the second hydraulic pump motor 9 combined drive. The combined driving is that a plurality of power sources drive simultaneously, and the specific driving process refers to the independent driving process and is combined into a combined driving scheme with different forms. The combined driving scheme can stably adjust the economic operation of the engine 1 for a long time, and achieves the effects of energy conservation and emission reduction.
The combined driving process of the motor generator 17, the first hydraulic pump motor 16 and the second hydraulic pump motor 9 is analyzed in detail, the vehicle control unit 19 monitors SOC values of the hydraulic accumulator 15 and the battery 18, after monitoring that the SOC value of the hydraulic accumulator 15 is in a dischargeable state and the SOC value of the battery 18 is in a dischargeable state, the vehicle control unit 19 collects and processes an accelerator pedal opening degree signal, and performs combined driving when determining that the regenerative driving force meets the driving force required by the vehicle. The vehicle control unit 19 controls the second clutch 8 to be combined, the torque coupler 3 is connected to a transmission system, and hydraulic oil in the hydraulic accumulator 15 is supplied to the second hydraulic pump motor 9 through the two-position two-way electromagnetic directional valve 13 to operate under a motor working condition; meanwhile, the storage battery 18 discharges electricity to the motor generator 17 to operate under the working condition of an electric motor, the motor machine drives the first hydraulic pump motor 16 to operate under the working condition of a pump, the hydraulic pump absorbs oil from the hydraulic oil tank 10 and outputs hydraulic oil to the second hydraulic pump motor 9 to operate under the working condition of a motor, and finally the torque of the hydraulic motor drives the driving wheel 7 to rotate through the second clutch 8, the torque coupler 3, the gearbox 4 and the driving axle 5, so that the vehicle travels. In the combined driving process of the motor generator 17, the first hydraulic pump motor 16 and the second hydraulic pump motor 9, the engine 1 does not work, and the vehicle achieves the effects of energy conservation and emission reduction.
In a possible embodiment of the present invention, the hydraulic pump further includes a first overflow valve 11, a first port of the first overflow valve 11 is connected to the hydraulic oil tank 10, and a second port of the first overflow valve 11 is connected to the second hydraulic pump motor 9.
Specifically, in this embodiment, the first overflow valve 11 plays a role of overload protection for the first auxiliary power assembly, and can be used as a safety valve.
In one possible embodiment of the present invention, the hydraulic control system further includes a second relief valve 14, a first port of the second relief valve 14 is connected to the hydraulic oil tank 10, and a second port of the first relief valve 11 is connected to the hydraulic accumulator 15.
Specifically, in this embodiment, the second relief valve 14 controls the maximum operating pressure of the hydraulic accumulator 15 by a relief pressure, and may be used as a relief valve.
In summary, the optimal energy recovery scheme in the braking condition of the oil-liquid hybrid power system of the walking engineering machinery is hydraulic-electric type composite energy recovery, and the hydraulic energy recovery and the electric energy recovery are performed in sequence, and the specific process is as follows: because the hydraulic energy accumulator 15 has high power density and is preferentially used when the vehicle starts, hydraulic energy recovery is preferentially performed and braking energy is recovered electrically in an auxiliary manner in the braking energy recovery process, so that the torque of the driving wheel 7 drives the second hydraulic pump motor 9 to operate under the pump working condition through the driving axle 5, the gearbox 4, the torque coupler 3 and the second clutch 8, and the hydraulic pump sucks oil from the hydraulic oil tank 10 and outputs hydraulic oil to flow into the hydraulic energy accumulator 15 through the one-way valve 12 to perform hydraulic energy recovery. After the hydraulic accumulator 15 finishes charging, the hydraulic pump absorbs oil from the hydraulic oil tank 10 and outputs hydraulic oil to be supplied to the first hydraulic pump motor 16 to operate under a motor working condition, and the hydraulic motor drives the motor generator 17 to operate under a generator working condition, so that the storage battery 18 is charged and electric energy recovery is performed; therefore, in the optimal hydraulic-electric composite energy recovery scheme, the braking energy can be efficiently recovered in a large range, and the energy recovery efficiency is improved. The optimal power scheme in the driving working condition of the oil-liquid hybrid power system of the walking engineering machinery is that a driving mode is reasonably selected according to the driving torque required by a vehicle, and when the regenerated driving force meets the driving requirement, the independent driving mode of the second hydraulic pump motor 9, the independent driving mode of the motor-generator 17 or the combined driving mode of the motor-generator 17, the first hydraulic pump motor 16 and the second hydraulic pump motor 9 is selected; when the regenerative drive power does not satisfy the drive request, selecting the engine 1-the second hydraulic pump motor 9 combined drive mode or the engine 1-the motor generator 17-the first hydraulic pump motor 16-the second hydraulic pump motor 9 combined drive mode; therefore, the use of the engine 1 is reduced or the operation of the engine 1 at an economic working point is stably adjusted for a long time, the fuel economy of the whole vehicle is greatly improved, and the effects of energy conservation and emission reduction are remarkable.
In short, the walking engineering machinery oil-liquid hybrid power system can efficiently recover braking energy in a large range through a reasonable energy recovery strategy under the braking working condition; in a driving working condition, the use of the engine 1 can be reduced or the operation of the engine at an economic working point can be stably adjusted for a long time through a reasonable driving strategy, the fuel economy of the whole vehicle is greatly improved, and the energy-saving and emission-reducing effects are obvious.
The second embodiment of the invention provides an oil hybrid vehicle, which comprises a vehicle body and the oil hybrid power system of the walking engineering machinery, wherein the oil hybrid power system of the walking engineering machinery is configured on the vehicle body.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.

Claims (10)

1. The walking engineering machinery oil-liquid hybrid power system is characterized by comprising a vehicle control unit, a power coupling assembly, a main power assembly, a second clutch, a first auxiliary power assembly and a second auxiliary power assembly;
the output shaft of the main power assembly is connected with the input shaft of the power coupling assembly, the first auxiliary power assembly is connected with the input shaft pipeline of the power coupling assembly through the second clutch, the first auxiliary power assembly is connected with the second auxiliary power assembly in parallel, the output end of the vehicle control unit is electrically connected with the control end of the main power assembly, the control end of the first auxiliary power assembly and the control end of the second auxiliary power assembly, and the input end of the vehicle control unit is electrically connected with a pedal of a walking engineering machine and a sensor of the walking engineering machine;
wherein the vehicle control unit is configured to implement the following steps by executing a computer program stored therein:
when the system is detected to be in a braking state, acquiring the SOC value of a hydraulic energy accumulator and the SOC value of a storage battery of the walking engineering machinery in real time, respectively comparing the SOC value of the hydraulic energy accumulator and the SOC value of the storage battery with corresponding preset values, and generating a comparison result;
when the comparison result shows that only the hydraulic energy accumulator is in the state of energy recovery, the first auxiliary power assembly is controlled to convert the braking energy generated by the power coupling assembly into hydraulic energy and store the hydraulic energy;
when the comparison result shows that only the storage battery is in the energy recovery available state, controlling the first auxiliary power assembly and the second auxiliary power assembly to convert the braking energy generated by the power coupling assembly into electric energy and store the electric energy;
when the hydraulic energy accumulator and the storage battery are judged to be in the state capable of energy recovery according to the comparison result, the first auxiliary power assembly is controlled to convert the braking energy generated by the power coupling assembly into hydraulic energy and store the hydraulic energy, and when the fact that the energy recovery of the hydraulic energy accumulator is finished is detected according to the SOC value of the hydraulic energy accumulator, the first auxiliary power assembly and the second auxiliary power assembly are controlled to convert the braking energy generated by the power coupling assembly into electric energy and store the electric energy.
2. The traveling construction machine oil hybrid power system according to claim 1, further comprising:
when the system is detected to be in a driving state, acquiring the SOC value of a hydraulic energy accumulator and the SOC value of a storage battery of the walking engineering machinery in real time, respectively comparing the SOC value of the hydraulic energy accumulator and the SOC value of the storage battery with corresponding preset values, and generating a comparison result;
when the comparison result is judged that only the hydraulic accumulator is in the releasable state, controlling the first auxiliary power assembly to drive the power coupling assembly to rotate;
when the comparison result is judged that only the storage battery is in a dischargeable state, the second auxiliary power assembly is controlled to drive the power coupling assembly to rotate;
and when the hydraulic accumulator is judged not to be in a dischargeable state and the storage battery is judged not to be in a dischargeable state according to the comparison result, the main power assembly is controlled to drive the power coupling assembly to rotate.
3. The mobile work machine oil-hybrid power system of claim 1, wherein the power coupling assembly comprises a torque coupler, a gearbox, a drive axle, and drive wheels;
an output shaft of the main power assembly is connected with an input shaft of the torque coupler, a first output shaft of the torque coupler is connected with an input shaft of the gearbox, a second output shaft of the torque coupler is connected with an input shaft of the first auxiliary power assembly, an output shaft of the gearbox is connected with the drive axle, and the drive axle is connected with the driving wheel.
4. The oil-liquid hybrid power system of walking engineering machinery according to claim 3, further comprising a brake device configured on the driving wheel, wherein an output end of the vehicle controller is electrically connected with a control end of the brake device.
5. The walking engineering machinery oil-liquid hybrid power system according to claim 3, wherein the main power assembly comprises an engine and a first clutch, an output shaft of the engine is connected with an input shaft of the torque coupler through the first clutch, and an output end of the vehicle control unit is electrically connected with a control end of the first clutch.
6. The walking engineering machine oil hybrid power system of claim 3, wherein the first auxiliary power assembly comprises a second hydraulic pump motor, a hydraulic oil tank, a one-way valve, a two-position two-way electromagnetic directional valve, and a hydraulic accumulator;
the second output shaft of the torque coupler is connected with the second hydraulic pump motor through the second clutch, the low-pressure oil path of the second hydraulic pump motor is connected with the hydraulic oil tank, the high-pressure oil path of the second hydraulic pump motor is connected with the hydraulic accumulator through the two-position two-way electromagnetic directional valve and the one-way valve, the second hydraulic pump motor and the second auxiliary power assembly are connected in parallel, and the output end of the whole vehicle controller is electrically connected with the control end of the second clutch, the control end of the second hydraulic pump motor and the control end of the two-position two-way electromagnetic directional valve.
7. The mechanical oil-water hybrid power system for walking engineering according to claim 1, wherein the second auxiliary power assembly comprises a first hydraulic pump motor, a motor-generator, and a battery, the first hydraulic pump motor is coaxially connected to the motor-generator, the motor-generator is electrically connected to the battery, and an output end of the vehicle control unit is electrically connected to a control end of the first hydraulic pump motor.
8. The walking engineering machinery oil-liquid hybrid power system according to claim 6, further comprising a first overflow valve, wherein a first port of the first overflow valve is connected to the hydraulic oil tank, and a second port of the first overflow valve is connected to the second hydraulic pump motor.
9. The walking engineering machinery oil-liquid hybrid power system according to claim 6, further comprising a second overflow valve, wherein a first port of the second overflow valve is connected to the hydraulic oil tank, and a second port of the first overflow valve is connected to the hydraulic accumulator.
10. The oil hybrid vehicle is characterized by comprising a vehicle body and the traveling engineering machinery oil hybrid system according to any one of claims 1 to 9, wherein the traveling engineering machinery oil hybrid system is configured on the vehicle body.
CN202211158343.1A 2022-09-22 2022-09-22 Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof Pending CN115534655A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211158343.1A CN115534655A (en) 2022-09-22 2022-09-22 Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211158343.1A CN115534655A (en) 2022-09-22 2022-09-22 Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof

Publications (1)

Publication Number Publication Date
CN115534655A true CN115534655A (en) 2022-12-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211158343.1A Pending CN115534655A (en) 2022-09-22 2022-09-22 Oil hybrid vehicle and traveling engineering machinery oil hybrid system thereof

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Country Link
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