CN111396227A - Cold start auxiliary system, heating auxiliary control method and engineering machinery - Google Patents
Cold start auxiliary system, heating auxiliary control method and engineering machinery Download PDFInfo
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- CN111396227A CN111396227A CN202010204970.9A CN202010204970A CN111396227A CN 111396227 A CN111396227 A CN 111396227A CN 202010204970 A CN202010204970 A CN 202010204970A CN 111396227 A CN111396227 A CN 111396227A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/005—Controlling temperature of lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The invention relates to a cold start auxiliary system, which aims to solve the problem that the cold start auxiliary system of the existing engineering machinery can not improve the performance of the machine at the initial starting stage of the machine; the auxiliary system comprises a water pump heater and electric heating devices for heating hydraulic oil, a storage battery and gearbox oil, wherein each electric heating device is connected with a temperature controller, the temperature controller is connected with a mains supply, each electric heating device comprises a silicon rubber heater and a temperature sensor, and the silicon rubber heater is attached to the outer surface of a heated object container. In the invention, the commercial power is used and the heating is carried out by the silicon rubber heater, so that the low-temperature cold starting performance of the whole vehicle can be ensured, the abrasion caused by the increase of the low-temperature viscosity of oil products in the cold starting and heating processes of the whole vehicle can be avoided, the discharge of a storage battery of the whole vehicle in the low-temperature environment can be avoided, and the sufficient electric quantity of the storage battery of the whole vehicle in the low-temperature environment can.
Description
Technical Field
The present invention relates to a cold start assist system, and more particularly, to a cold start assist system, a heating assist control method, and an engineering machine.
Background
The construction machine is an outdoor operation device, and the stop state and the operation state of the construction machine are usually in the open air. In the shutdown state, the temperature of the various components on the machine tends to be the same as the environment, since the components of the machine stop working and do not generate heat. There are various fluids and components on the machine, such as engine oil, coolant, hydraulic oil, transmission oil, batteries, etc. In the case of a liquid, the viscosity is high and the fluidity is poor in the case of a low temperature state, and the performance of the battery is low in the case of a low temperature state. After the machine works for a long time, the temperature of each oil liquid, namely parts on the machine can be raised to a normal temperature level through the heat generation of the machine, but in the initial starting stage, the heat generation amount of the machine is less, each oil liquid and parts are still in a low-temperature state, the oil liquid can not exert the performance of the oil liquid, the machine can not work normally, for example, engine lubricating oil and gearbox oil can not lubricate a rotating part and a sliding part to cause great abrasion, the pressure in a hydraulic pipeline is increased due to the poor fluidity of the hydraulic oil, and the risk of pipeline burst exists. In order to cope with such a situation, it is necessary to provide a cold start assist system for the machine for heating the respective oil and the battery to assist the cold start of the machine.
The single heating of the air inlet temperature of the engine and the water temperature of the engine body can effectively improve the starting performance of the whole engine in the low-temperature environment, but the situation that the oil flow resistance of an ① hydraulic pump and a variable speed pump is too large to cause abrasion due to unsmooth oil absorption or the rupture of the pump ② oil filter of the transmission causes the explosion filter due to the too large oil viscosity in the starting and heating processes in the low-temperature environment is difficult to avoid that the cold starting performance of the whole engine is influenced due to the insufficient electric quantity of a storage battery caused by the low-temperature discharge of the storage battery in the low-temperature environment.
Disclosure of Invention
The invention provides a cold start auxiliary system, a heating auxiliary control method and engineering machinery, aiming at solving the technical problem that the cold start auxiliary system of the existing engineering machinery can not improve the performance of the machine at the initial starting stage of the machine, so as to improve the performance of the machine at the initial starting stage.
The technical scheme for realizing the purpose of the invention is as follows: the cold start auxiliary system is characterized by comprising a water pump heater, a coolant temperature sensor and an electric heating device, wherein the water pump heater is used for heating engine coolant and is connected with a temperature controller, the coolant temperature sensor is used for detecting the temperature of the engine coolant and is connected with the temperature controller, the electric heating device is used for heating the hydraulic oil and is connected with the temperature controller, the temperature controller is connected with a mains supply, the electric heating device comprises a silicon rubber heater and a temperature sensor, the temperature sensor is used for detecting the temperature of a heated object, and the silicon rubber heater is used for heating the hydraulic oil and is attached to the outer surface of a hydraulic oil tank. In the invention, the commercial power is used, the silicon rubber heater is used for heating the hydraulic oil, and the water pump heater is used for heating the engine cooling liquid, so that the low-temperature cold starting performance of the whole vehicle can be ensured, the abrasion of the engine, the hydraulic pump and the variable speed pump caused by the increase of the low-temperature viscosity of oil products in the cold starting and heating processes of the whole vehicle can be avoided, the low-temperature environment discharge of a storage battery of the whole vehicle can be avoided, and the sufficient electric quantity of the storage battery of the.
Furthermore, the cold start auxiliary system also comprises an electric heating device which is used for heating engine lubricating oil and is connected with the temperature controller, and a silicon rubber heater of the electric heating device is attached to the outer surface of the engine lubricating oil pan.
Furthermore, the cold start auxiliary system further comprises an electric heating device which is used for heating the gearbox oil and is connected with the temperature controller, and a silicon rubber heater of the electric heating device is attached to the outer surface of the gearbox bottom shell.
Furthermore, the cold start auxiliary system also comprises an electric heating device which is used for heating the storage battery and is connected with the temperature controller, and a silicon rubber heater of the electric heating device is attached to the outer surface of the storage battery.
Further, in the cold start auxiliary system, a switch is arranged on a connecting circuit between the water pump heater and the silicone rubber heater of each electric heating device and the temperature controller.
The technical scheme for realizing the purpose of the invention is as follows: the heating auxiliary control method for the cold start auxiliary system is characterized in that the temperature of each heated oil is obtained, when the temperature of the heated oil is lower than a preset temperature, a temperature controller controls a heater corresponding to the heated oil to be in a heating mode, and the heating mode power Q1: q1 ═ CM Δ T + KA Δ T; wherein C is the specific heat capacity of the oil, M is the mass of the heated oil, Delta T is the difference between the target temperature of the heated oil and the ambient temperature, K is the heat exchange coefficient of the heated oil and the environment, and A is the heat exchange area of the heated oil and the environment. Further, when the temperature of the heated oil is higher than the preset temperature, the temperature controller controls the heater corresponding to the heated oil to be in a heat preservation mode, and the power of the heat preservation mode is as follows: q2 ═ KA Δ T.
In the heating auxiliary control method, the cold start auxiliary system further comprises an electric heating device for heating engine lubricating oil, an electric heating device for heating gearbox oil and an electric heating device for heating a storage battery, and each electric heating device is connected with a temperature controller; when the temperatures of the engine cooling liquid and the hydraulic oil are respectively higher than the corresponding preset values, the temperature controller controls the corresponding electric heating devices to independently heat the engine lubricating oil, the gearbox oil and the storage battery until the temperatures of all heated objects reach the preset values.
The technical scheme for realizing the purpose of the invention is as follows: provided is a construction machine characterized by having the aforementioned cold start assist system.
Compared with the prior art, the invention has the advantages that: the low-temperature cold starting performance of the whole vehicle can be ensured, the abrasion of an engine, a hydraulic pump and a variable speed pump caused by the increase of the low-temperature viscosity of oil products in the cold starting and heating processes of the whole vehicle can be avoided, the low-temperature environment discharge of a storage battery of the whole vehicle can be avoided, and the sufficient electric quantity of the storage battery of the whole vehicle in the low-temperature environment is ensured.
Drawings
FIG. 1 is a schematic diagram of a cold start assist system for a loader of the present invention.
Part names and serial numbers in the figure:
the system comprises a storage battery 1, a storage battery temperature sensor 2, a storage battery heater 3, a gearbox oil temperature sensor 4, a gearbox oil heater 5, a gearbox 6, a hydraulic oil temperature sensor 7, a hydraulic oil heater 8, a hydraulic oil tank 9, an engine lubricating oil heater 10, a coolant temperature sensor 11, an engine water outlet 12, an engine water inlet 13, an engine 14, a water pipe 15, a coolant heater 16, a cable 17, a first mechanical temperature control sensor 18, a second temperature sensor 19, a mechanical temperature control switch group 20, an air switch 21, a temperature controller 22 and a mains supply 23.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
As shown in fig. 1, the cold start assist system in this embodiment is a cold start assist system of a loader. The loader is provided with an engine 14, a hydraulic oil tank 9 for containing hydraulic oil, a gearbox 6, a storage battery 1 and the like. The cold start auxiliary system comprises an engine coolant electric heating device, an engine lubricating oil electric heating device, a hydraulic oil electric heating device, a gearbox oil electric heating device, a storage battery electric heating device, a temperature controller 22 and an air switch 21.
The water inlet 13 of the engine is connected with the water outlet 12 of the engine through a water pipe 15, and a water pump is arranged on a circulating water path of engine cooling liquid to drive the circulation of the engine cooling liquid. The engine coolant electric heating device comprises a water pump heater 16, a coolant temperature sensor 11, a first mechanical temperature control sensor 18 for detecting the temperature of the water pump heater 16, and a first mechanical temperature control switch 161 triggered by the first mechanical temperature control sensor 18. The coolant temperature sensor 11 is used to detect the temperature of the coolant. The water pump heater and the water pump are integrally installed together, and the water pump heater 16 is connected with the temperature controller 22 after being sequentially connected with the first mechanical temperature control switch 161 and the air switch 21 in series. The first mechanical temperature control sensor 18 and the first mechanical temperature control switch 161 constitute a protection device for protecting the water pump heater 16 from overheating, and when the temperature of the water pump heater 16 reaches the temperature at which the first mechanical temperature control switch 161 is turned off (the set upper temperature limit of the water pump heater 16), the first mechanical temperature control switch 161 is turned off, otherwise, the first mechanical temperature control switch 161 is in a closed state.
The engine lubricating oil electric heating device comprises an engine lubricating oil electric heater 10, an engine lubricating oil temperature sensor 21 for detecting the temperature of engine lubricating oil, a second mechanical temperature control sensor 101 for detecting the temperature of the engine lubricating oil electric heater 10, and a second mechanical temperature control switch 102 triggered by the second mechanical temperature control sensor 101, wherein the engine lubricating oil temperature sensor 21 is connected with a temperature controller 22, and the engine lubricating oil electric heater 10 is connected with the temperature controller 22 after being sequentially connected with the second mechanical temperature control switch 102 and an air switch 21 in series. The engine lubricating oil electric heater 10 is a silicone rubber heater that is adhered to the outer surface of the bottom case of the engine 14. The second mechanical temperature control sensor 101 and the second mechanical temperature control switch 102 constitute a protection device for performing overheat protection on the engine lubricating oil electric heater 10, when the temperature of the engine lubricating oil electric heater 10 reaches the temperature at which the second mechanical temperature control switch 102 is turned off, otherwise, the second mechanical temperature control switch 102 is in a closed state.
The hydraulic oil electric heating device comprises a hydraulic oil electric heater 8, a hydraulic oil temperature sensor 7 for detecting the temperature of hydraulic oil, a third mechanical temperature control sensor 81 for detecting the temperature of the hydraulic oil electric heater 8, and a third mechanical temperature control switch 82 triggered by the third mechanical temperature control sensor 83. The hydraulic oil temperature sensor 7 is connected to a temperature controller 22. The hydraulic oil electric heater 8 is connected with the third mechanical temperature control switch 82 and the air switch 21 in series in sequence and then connected with the temperature controller 22. The hydraulic oil electric heater 10 is a silicone rubber heater, which is adhered to the outer surface of the hydraulic oil tank 9. The third mechanical temperature control sensor 81 and the third mechanical temperature control switch 82 constitute a protection device for performing overheat protection on the hydraulic oil electric heater 8, when the temperature of the hydraulic oil electric heater 8 reaches the temperature at which the third mechanical temperature control switch 82 is turned off, otherwise, the third mechanical temperature control switch 82 is in a closed state.
The gearbox oil electric heating device comprises a gearbox oil electric heater 5, a gearbox oil temperature sensor 4 used for detecting the temperature of the gearbox oil, a fourth mechanical temperature control sensor 5 used for detecting the temperature of the gearbox oil electric heater 5, and a fourth mechanical temperature control switch 52 triggered by a fourth mechanical temperature control sensor 51. The transmission oil temperature sensor 4 is connected to a temperature controller 22. The gearbox oil electric heater 5 is connected with the fourth mechanical temperature control switch 52 and the air switch 21 in series in sequence and then connected with the temperature controller 22. The gearbox oil electric heater 5 is a silicon rubber heater, and the electric heater is adhered to the outer surface of the bottom shell of the gearbox 6. The fourth mechanical temperature control sensor 51 and the fourth mechanical temperature control switch 52 form a protection device for performing overheat protection on the transmission oil electric heater 5, when the temperature of the transmission oil electric heater 5 reaches the disconnection temperature of the fourth mechanical temperature control switch 52, the fourth mechanical temperature control switch 52 is disconnected, otherwise, the fourth mechanical temperature control switch 52 is in a closed state.
The storage battery electric heating device comprises a storage battery electric heater 3, a storage battery temperature sensor 1 for detecting the temperature of the storage battery, a fifth mechanical temperature control sensor 31 for detecting the temperature of the storage battery electric heater 3, and a fifth mechanical temperature control switch 32 triggered by the fifth mechanical temperature control sensor 31. The battery temperature sensor 2 is connected to a temperature controller 22. The storage battery electric heater 3 is connected with the fifth mechanical temperature control switch 32 and the air switch 21 in series in sequence and then connected with the temperature controller 22. The battery electric heater 3 is a silicon rubber heater, which is adhered to the outer surface of the battery 1. The fifth mechanical temperature control sensor 31 and the fifth mechanical temperature control switch 32 constitute a protection device for protecting the electric storage battery heater 3 from overheating, when the temperature of the electric storage battery heater 3 reaches the temperature at which the fifth mechanical temperature control switch 32 is turned off, otherwise, the fifth mechanical temperature control switch 32 is in a closed state.
The first mechanical temperature control switch 161, the second mechanical temperature control switch 102, the third mechanical temperature control switch 82, the fourth mechanical temperature control switch 52 and the fifth mechanical temperature control switch 32 are integrated to form the mechanical temperature control switch group 20.
Each electric heater is connected with a temperature controller 22 through an independent air switch 21 by a cable 17, and the temperature controller 22 can independently control each electric heater. The temperature controller 22 is connected to a mains supply 23. The temperature controller 22 is a digital display temperature controller, and can be used to set a target temperature of each object to be heated, display a measured temperature of each object to be heated, and control heating power of each electric heater.
The electric heating device of the cold start assist system is increased or decreased depending on the arrangement of the construction machine, and for example, in a loader in which a torque converter is arranged, the cold start assist system further includes a torque converter oil heater for heating the torque converter oil. In the excavator, because transmission parts such as a gearbox are not arranged, a cold start auxiliary system in the excavator does not have a corresponding gearbox oil electric heating device. The construction machine may be a machine such as an excavator, a grader, a road roller, a milling machine, and a wide-body vehicle, in addition to a loader.
In the invention, when the loader is positioned in a low-temperature environment and needs to be heated before starting, the cold starting auxiliary system is connected to a mains supply circuit, and the temperature controller firstly heats the cooling liquid and the hydraulic oil. And during heating, the temperature of the cooling liquid and the temperature of the hydraulic oil are respectively detected through the cooling liquid temperature sensor and the hydraulic oil temperature sensor. When the detected temperature of the cooling liquid is lower than the preset target temperature of the cooling liquid, the temperature controller controls the cooling liquid electric heater 16 to heat the cooling liquid, and the cooling liquid electric heater is in a heating mode. The power of the coolant electric heater in the heating mode is as follows: q1 ═ CM Δ T + KA Δ T; wherein C is the specific heat capacity of the cooling liquid, M is the mass of the cooled liquid, Delta T is the difference between the target temperature of the cooling liquid and the ambient temperature, K is the heat exchange coefficient of the cooling liquid and the environment, and A is the heat exchange area of the cooling liquid and the environment. When the temperature of coolant reaches preset coolant target temperature, temperature controller control coolant liquid electric heater 16 automatic switch to heat preservation mode work, reduce the heating power of heater, and the heating power accessible temperature control module setting of each heater of heat preservation state, guarantee that fluid is heated to suitable temperature, avoid lasting high power heating and cause the energy extravagant, avoid the high temperature to arouse the change of oil quality, avoid the battery high temperature to cause the emergence of dangerous accidents such as conflagration. The power of the cooling liquid electric heater in the heat preservation mode is as follows: q2 ═ KA Δ T. When the oil such as engine lubricating oil, gearbox oil, hydraulic oil and the like is heated, the temperature controller controls the corresponding electric heaters in the same way as the electric heaters of the cooling liquid.
In the control process of heating oil and parts by the cold start auxiliary system, when the temperatures of the cooling liquid and the hydraulic oil reach respective set values, the temperature controller controls the corresponding electric heaters to heat the storage battery, the engine lubricating oil and the gearbox oil.
Claims (9)
1. The cold start auxiliary system comprises a water pump heater, a coolant temperature sensor and an electric heating device, wherein the water pump heater is used for heating engine coolant and is connected with a temperature controller, the coolant temperature sensor is used for detecting the temperature of the engine coolant and is connected with the temperature controller, the electric heating device is used for heating hydraulic oil and is connected with the temperature controller, the temperature controller is connected with a mains supply, the electric heating device comprises a silicon rubber heater and a temperature sensor, the temperature sensor is used for detecting the temperature of a heated object, and the silicon rubber heater is used for heating the hydraulic oil and is attached to the outer surface of a hydraulic oil tank.
2. The cold start assist system of claim 1 further comprising an electrical heating device for heating engine oil and connected to the temperature controller, the electrical heating device having a silicone rubber heater attached to an outer surface of an engine oil sump.
3. The cold start assist system as claimed in claim 1, further comprising an electric heater connected to the temperature controller for heating the transmission oil, the silicone rubber heater of the electric heater being attached to an outer surface of the transmission case.
4. The cold start assist system as claimed in claim 1, further comprising an electric heating device for heating the secondary battery and connected to said temperature controller, the silicone rubber heater of the electric heating device being attached to an outer surface of the secondary battery.
5. The cold start assist system according to any one of claims 1 to 4, wherein a switch is provided on a connection circuit between the water pump heater and the silicone rubber heater of each electric heating device and the temperature controller.
6. A heating assist control method for the cold start assist system as set forth in claim 1, wherein the temperature of each heated oil is obtained, and when the temperature of the heated oil is lower than a preset temperature, the temperature controller controls a heater corresponding to the heated oil to be in a heating mode, and the heating mode power Q1: q1 ═ CM Δ T + KA Δ T;
wherein C is the specific heat capacity of the oil, M is the mass of the heated oil, Delta T is the difference between the target temperature of the heated oil and the ambient temperature, K is the heat exchange coefficient of the heated oil and the environment, and A is the heat exchange area of the heated oil and the environment.
7. The heating auxiliary control method according to claim 6, wherein when the temperature of the heated oil is higher than a preset temperature, the temperature controller controls a heater corresponding to the heated oil to be in a heat preservation mode, and the heat preservation mode power is as follows: q2 ═ KA Δ T.
8. The heating assist control method according to claim 6 or 7, wherein the cold start assist system further includes an electric heating device for heating engine lubricating oil, an electric heating device for heating transmission oil, and an electric heating device for heating the storage battery, each of the electric heating devices being connected to the temperature controller; when the temperatures of the engine cooling liquid and the hydraulic oil are respectively higher than the corresponding preset values, the temperature controller controls the corresponding electric heating devices to independently heat the engine lubricating oil, the gearbox oil and the storage battery until the temperatures of all heated objects reach the preset values.
9. A working machine characterized by having a cold start assist system as set forth in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010204970.9A CN111396227A (en) | 2020-03-23 | 2020-03-23 | Cold start auxiliary system, heating auxiliary control method and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010204970.9A CN111396227A (en) | 2020-03-23 | 2020-03-23 | Cold start auxiliary system, heating auxiliary control method and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN111396227A true CN111396227A (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010204970.9A Withdrawn CN111396227A (en) | 2020-03-23 | 2020-03-23 | Cold start auxiliary system, heating auxiliary control method and engineering machinery |
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| Country | Link |
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| CN (1) | CN111396227A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177786A (en) * | 2020-08-19 | 2021-01-05 | 潍柴动力股份有限公司 | Large-cylinder-diameter engine unit system and control method |
| CN112648265A (en) * | 2021-01-05 | 2021-04-13 | 中联重科土方机械有限公司 | Heating system for hydraulic system, heating control method and excavator |
| RU2766651C1 (en) * | 2021-06-07 | 2022-03-15 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Ярославский государственный технический университет" ФГБОУВО "ЯГТУ" | Truck reduction drive oil heater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177786A (en) * | 2020-08-19 | 2021-01-05 | 潍柴动力股份有限公司 | Large-cylinder-diameter engine unit system and control method |
| CN112177786B (en) * | 2020-08-19 | 2022-11-29 | 潍柴动力股份有限公司 | Large-cylinder-diameter engine unit system and control method |
| CN112648265A (en) * | 2021-01-05 | 2021-04-13 | 中联重科土方机械有限公司 | Heating system for hydraulic system, heating control method and excavator |
| CN112648265B (en) * | 2021-01-05 | 2023-11-21 | 中联重科土方机械有限公司 | Heating system for hydraulic system, heating control method and excavator |
| RU2766651C1 (en) * | 2021-06-07 | 2022-03-15 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Ярославский государственный технический университет" ФГБОУВО "ЯГТУ" | Truck reduction drive oil heater |
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