Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/20—Cooling circuits not specific to a single part of engine or machine
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P7/00—Controlling of coolant flow
  • F01P7/14—Controlling of coolant flow the coolant being liquid
  • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P2060/00—Cooling circuits using auxiliaries
  • F01P2060/04—Lubricant cooler
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P2060/00—Cooling circuits using auxiliaries
  • F01P2060/08—Cabin heater

Definitions

• Control system for a thermal regulation means of a motor vehicle cooling circuit and method for controlling said control system
• the present invention relates to the field of cooling circuits of a propulsion means of a motor vehicle, and in particular of a heat engine.
• the invention relates to thermal regulation of the cooling circuit in order to improve the efficiency of the engine and to reduce fuel consumption.
• the heat present in the heat transfer fluid is intended to transfer heat to the engine oil through a fluid / oil exchanger and thus to reduce the fuel consumption through the reduction friction in the heat engine, and secondly, to transfer heat to the passenger compartment of the vehicle through a heater to warm the cabin and allow demisting the windshield.
• the object of the invention is a method of controlling a means for thermally regulating a cooling fluid circulating in a cooling circuit of an internal combustion engine of a motor vehicle under the action of a pump. of circulation.
• Said cooling circuit comprises a first branch containing an engine cooling radiator, a second branch containing a fluid - motor oil exchanger to be traversed by the engine oil and a third branch containing a heater for heating the passenger compartment of the engine. motor vehicle .
• Said thermal fluid control means comprises a fluid inlet connected to a cooling fluid inlet at the outlet of the engine and a first, second and third fluid outlet respectively connected to the first, second and third branches of the cooling circuit.
• the control method determines the operating mode in summer or winter mode of the thermal control means and the opening or closing of the third branch is controlled as a function of the comparison of the difference between the value of the temperature of the fluid in question. upstream of the heater and the value of the fluid temperature at the output of the internal combustion engine with a fourth threshold value.
• the measured value of the outside temperature is compared with a first threshold value.
• the opening of the second branch is ordered in summer or winter mode when the temperature of the fluid output from the internal combustion engine is greater than or equal to a second threshold value.
• the thermal regulation means is a multichannel valve provided with a body and at least one plug rotatably mounted inside said body about an axis coaxial with the fluid inlet and capable of sealing in whole or in part each of the fluid outlets according to its angular position.
• the position of displacement of the valve plug of the second branch is between [- 10%; -35%] of its maximum displacement range
• the position of movement of the valve plug of the second branch is between [-5%; 30%>] of its maximum displacement range.
• the opening or closing of the first branch is controlled as a function of the value of the temperature of the fluid leaving the engine.
• the cooling fluid flows. through the third branch and when the difference between the temperature of the fluid upstream of the heater and the temperature of the fluid at the outlet of the internal combustion engine is greater than or equal to the fourth threshold value, the fluid outlet connected to the third branch is closed.
• the opening and closing of the third branch is controlled as a function of the temperature of the fluid at the outlet of the internal combustion engine and the temperature upstream of a turbine of the engine.
• the invention relates to a control system for a means of thermal regulation of a cooling fluid flowing in a cooling circuit of an internal combustion engine of a motor vehicle under the action a circulation pump.
• Said cooling circuit comprises a first branch containing an engine cooling radiator, a second branch containing a fluid - motor oil exchanger to be traversed by the engine oil and a third branch containing a heater for heating the passenger compartment of the engine. motor vehicle.
• Said thermal fluid control means comprises a fluid inlet connected to a cooling fluid inlet at the outlet of the engine and a first, second and third fluid outlet respectively connected to the first, second and third branches of the cooling circuit.
• the control system comprises a control module of the thermal regulation means comprising a module for determining the operating mode in summer or winter mo of the thermal regulation means and a control module for opening or closing the third branch. according to the value of the temperature of the fluid at the outlet of the internal combustion engine and the value of the temperature of the fluid upstream of the heater.
• control module for opening and closing the third branch comprises means for comparing the temperature difference between the fluid temperature upstream of the heater and the temperature of the fluid at the outlet of the internal combustion engine. with a fourth threshold value.
• the module for determining the mode of operation in summer or winter mode of the thermal regulation means comprises means for comparing the measured value of the outside temperature with a first threshold value.
• control system comprises a control module for opening the second branch, in summer or winter mo, when the temperature of the fluid at the outlet of the internal combustion engine is greater than or equal to one. second threshold value.
• control system comprises a control module for opening or closing the first branch as a function of the value of the temperature of the fluid leaving the engine.
• control system includes a noise management module related to the boiling of the coolant at the turbocharger of the internal combustion engine, said means for controlling the opening or closing of the third engine. branch containing the heater according to the temperature of the fluid at the outlet of the internal combustion engine and the temperature upstream of the engine turbine.
• Figure 1 is a schematic view of a thermal control system of a cooling circuit according to the invention
• FIG. 2 shows in detail a control system of the thermal regulation system according to FIG. 1;
• FIG. 4 represents another mode of implementation of the method according to the invention.
• FIG. 5 represents a diagram illustrating the sequencing of the openings and closures of the channels for the heat transfer fluid flow in each of the branches of the cooling circuit according to the modes of implementation of the thermal regulation system according to the invention.
• a thermal control system 1, referenced 1 as a whole, is intended to be integrated in a motor vehicle comprising a cooling circuit 2 of an internal combustion engine 3.
• the cooling circuit 2 is traversed by a coolant or cooling fluid, for example water containing an antifreeze, which circulates in a closed circuit under the action of a circulation pump 4 and serves the purpose of partly to cool or heat the internal combustion engine 3, and secondly, to heat the passenger compartment of the motor vehicle (not shown).
• a coolant or cooling fluid for example water containing an antifreeze
• the cooling circuit 2 comprises a first branch 2a containing a cooling radiator 5 of the internal combustion engine 3, a second branch 2b containing the internal combustion engine 3, disposed in parallel with the first branch 2a and a third branch 2c containing a heater 6, for heating the passenger compartment of the vehicle.
• the second branch 2b comprises an exchanger 7 fluid-engine oil to be traversed by the engine oil and the cooling fluid and to heat or cool the engine oil.
• the branches 2a, 2b, 2c of the cooling circuit 2 are interconnected by a thermal regulation means 8 of the fluid comprising a fluid inlet 8a connected to the output of the internal combustion engine 3 and three outlets 8b, 8c, 8d. fluid corresponding respectively to the first, second and third branches 2a, 2b, 2c.
• the thermal control means 8 may be, for example, a multi-way valve.
• the opening and closing of the channels of the thermal regulation means 8 are controlled by a control system 10 making it possible to control the distribution of the cooling fluid in the three branches 2a, 2b, 2c of the cooling circuit 2.
• the multi-way valve may be a rotary valve in that it comprises a body having an axial inlet and a plurality of radial outlets, namely one for the first branch 2a, one for a second branch 2b for bypassing the heat exchangers on air, and finally one for the third branch 2c.
• the body of such a rotary valve may be a cylindrical inside which is rotatably mounted, about an axis coaxial with the fluid inlet, a plug shaped so that it closes all or part of each output according to its angular position.
• FIG. 5 represents a flow diagram of the heat transfer fluid in each of the branches of the cooling circuit, according to the rotational range of the movable bushel between its extreme positions [-50%; 50%].
• the diagram illustrated in FIG. 5 represents, on the ordinate, the ratio of opening R in percentage and on the abscissa, the position of the valve Pv in percentage in SUMMER mode and in WINTER mode.
• the thermal regulation means 8 allow a variation of the permeability of each branch between a zero value and a maximum value.
• the maximum values of the first, second and third branches 2a, 2b and 2c are respectively 400 mm 2 , 150 mm 2 and 200 mm 2 .
• the multichannel valve can be a valve comprising a plurality of movable plugs, each of which can be dedicated to one of the branches 2a, 2b or 2c, and controlled separately from at least one other.
• each bushel has a neutral position corresponding to the median 0%> between two ranges of displacement varying between [-50%>; 50%>] maximum travel positions.
• the curve "Ra” in the diagram of Figure 5 relates to the permeability of the first branch 2a including the radiator 5.
• the curve "Bp” relates to the permeability of the second branch 2b bypass cooling heat exchangers.
• the curve "He” relates to the permeability of the third branch 2c including the heater 6.
• the control system 1 0 comprises an information retrieval module 1 1, in particular the temperature T fm of the fluid at the outlet of the engine. internal combustion, the temperature T fa of the fluid upstream of the heater, the external temperature T ext to the motor vehicle, the temperature T cons of the heating setpoint requested by the user of the vehicle, the temperature T fr of the fluid upstream of the radiator and the temperature T AvT upstream of the engine turbine.
• This information can be measured using temperature sensors (not shown).
• the control system 10 comprises a module 12 for controlling the thermal regulation means 8.
• the control module 12 for the thermal regulation means 8 comprises a module 1 3 for determining the operating mode of the thermal regulation means 8, it being a say an operation in summer mode, or in winter mode.
• the mode of determination module 13 comprises a comparison means (not shown) of the external temperature T Ext with a first threshold value S I.
• the first threshold value S I is, by way of non-limiting example, equal to 18 ° C.
• the winter mode is switched on.
• the external temperature T Ext is greater than or equal to the first threshold value S I
• the summer mode is switched on.
• the control system 10 comprises a module 14 for controlling the opening of the second branch 2b, in summer or winter mode, when the temperature T fm of the fluid at the outlet of the internal combustion engine is greater than or equal to a second value of threshold S2.
• the second threshold value S2 is, by way of non-limiting example, equal to 40 ° C.
• the minimum permeability of the branch 2b for bypassing the air heat exchangers, which are the radiator 5 and the heater 6, is 50 mm 2 , which represents a permeability equivalent to 1/3 of the permeability maximum of 150 mm 2 , as shown in Figure 5.
• the opening angle of the valve of the second branch 2b is proportional to the temperature T fm of the fluid at the outlet of the internal combustion engine 3 , so that the permeability of the branch 2b varies between 50 mm 2 and 150 mm 2 .
• the thermal regulation system 10 circulates the fluid in the second branch 2b, by shorting the radiator 5.
• the position of movement of the valve plug of the second branch 2b is for example between [- 10%; -20%] of the maximum opening and in winter mode, the position of movement of the valve of the second branch 2b is for example between [-5%>; 0%>] of its maximum range of movement.
• the flow rate in the branch 2a comprising the radiator 5 is zero, just like that in the branch 2c comprising the heater 6. This promotes a rapid temperature rise of the engine 3.
• the control system 10 comprises a module 15 for controlling the opening of the first branch 2a, in summer or winter mode, when the temperature T fm of the fluid at the outlet of the internal combustion engine is greater than or equal to the third value of threshold S3.
• the thermal control system circulates the cooling fluid in parallel in the first and second branches 2a, 2b.
• the third threshold value S3 is, by way of non-limiting example, equal to 90 ° C.
• the displacement position of the bushel the valve of the first branch 2a is for example between [-25%; -40%] of its movement range.
• the opening angle of the valve of the first branch 2a is for example between [10%>; 45%] of its movement range.
• the displacement position of the valve plug of the third branch 2c is between [10%; 20%] of its displacement range, in proportion to the heating requirement, which corresponds to a permeability of the second branch 2b respectively between 150 mm 2 and 50 mm 2 and a permeability of the third branch 2c between 0 mm 2 and 200 mm 2 .
• the control system 10 comprises a module 16 for controlling the opening of the third branch 2c, in winter mode, when the temperature difference between the temperature T fa of the fluid upstream of the heater 6 and the temperature T fm of the fluid at the output of the internal combustion engine 3 is greater than or equal to a fourth threshold value S4.
• the fourth threshold value S4 is, by way of non-limiting example equal to 60 ° C.
• the opening angle of the valve of the third branch 2c is proportional to the temperature T cons of the heating setpoint requested by the user of the vehicle.
• the position of displacement of the valve of the third branch is, for example, between [10%; 20%>] of its range of displacement which corresponds approximately to a permeability of the branch 2c between 0 and 200 mm 2 .
• the position of displacement of the valve of the third branch 2c is, for example, between [10%>;15%>] its movement range, which corresponds to approximately at a permeability of the branch 2c of between 0 and 100 mm 2 .
• the third branch 2c containing the heater 6 By partially opening the third branch 2c containing the heater 6, it avoids the risk of thermal shock due to a large temperature difference between the cooling fluid at the outlet of the engine 3 and the cooling fluid in the third branch 2c. Once the risk of thermal shock has been eliminated, the third branch 2c can be fully opened.
• a fifth threshold value S5 is, by way of non-limiting example, equal to 20 ° C.
• the displacement position of the valve plug of the third branch 2c is, for example, between [0%; 10%] of its displacement weight which corresponds to a permeability of the first and third branches 2a and 2c respectively zero, while maintaining a fluid flow in the second branch 2b corresponding to the maximum permeability of 150 mm 2
• the control system 10 In summer mode, when the temperature T fm of the fluid at the outlet of the internal combustion engine 3 is greater than or equal to a sixth threshold value S6, the control system 10 circulates the cooling fluid in the third branch 2c in addition to the first branch 2a including the radiator 5.
• the sixth threshold value S6 is, by way of non-limiting example equal to 1 10 ° C.
• the displacement position of the valve plug of the first branch 2a is, for example, between [-40%; -50%>] of its range of displacement which corresponds to a maximum permeability of the first branch 2a of 400 mm 2 .
• the opening of the third branch 2c containing the heater may be possible in the event of a specific need for engine cooling which results in an increase in the flow of liquid from the engine. cooling that passes through it.
• the displacement position of the valve plug is, for example, between [-40%; -50%] of its range of displacement which corresponds to a maximum permeability of the first branch 2a of 400 mm 2 and a permeability of the third branch 2c between 0 and 100 mm 2 .
• the occasional need for cooling can be easily identified by the engine mapping which incorporates the values of engine speed and engine torque parameters requiring improved cooling.
• the opening of the third branch 2c containing the heater may be possible in case of occasional need to deglaze the evaporator of the air conditioning system which is downstream of the heater according to the direction of flow of the heater. the air of the heater, ventilation and air conditioning of the vehicle.
• the displacement position of the valve of the third branch 2c is, for example, between [-40%>;-50%>] of its range of movement corresponding to the permeability between 100 mm 2 and 200 mm 2 for the branch 2c containing the heater, according to the heating requirement, and a maximum permeability of 400 mm 2 for the branch 2a containing the radiator 5.
• the displacement position of the valve of the third branch is, for example, between [-40%>;-45%>] of its range of displacement corresponding to the permeability between 0 and 100 mm 2 for the branch 2c containing the heater and a maximum permeability of 400 mm 2 for the branch 2a containing the radiator 5.
• the reduction of the fluid flow in the heater 6 makes it possible to limit the thermal shock.
• a seventh threshold value S7 is, by way of non-limiting example, equal to 80 ° C.
• the displacement position of the valve plug is, for example, between [-30%; -40%] of its range of displacement corresponding to the zero permeability for the third branch 2c and a permeability of between 25 mm 2 and 400 mm 2 for the first branch 2a containing the radiator 5.
• the control system 10 also comprises a module 17 for noise management related to the boiling of the coolant at the turbocharger (not shown) of the internal combustion engine 3.
• the turbocharger is cooled by the coolant circulating through the cooling circuit 2.
• the coolant temperature at the turbocharger T AvT can exceed the value of the boiling temperature of the coolant and thus generate air bubbles which will propagate in the cooling circuit 2.
• the bursting of these air bubbles generates noise which may be a nuisance for the driver of the vehicle, especially if the bursting occurs in the heater 6.
• the noise management module 17 controls the opening or closing of the third branch 2c containing the heater 6 as a function of the temperature T fm of the fluid at the output of the internal combustion engine and the temperature T AvT upstream of the engine turbine. If the temperature T fm of the fluid at the outlet of the internal combustion engine is greater than the third threshold value S 3 and the temperature T AvT upstream of the engine turbine is greater than an eighth threshold value S 8, for example equal to 800 ° C, the third branch 2c containing the heater 6 is closed and the fan motor unit GMV, parallel to the radiator 5 is turned on.
• the displacement position of the valve plug is, for example, -40% of its displacement range, corresponding to the zero permeability for the third branch 2c and a maximum permeability of 400 mm 2 for the first branch 2a containing the radiator 5.
• the position of displacement of the plug of the valve is then, for example, between [-40%; -50%>] of its range of displacement corresponding to the permeability of the third branch 2c between 0 and 200 mm 2 and a maximum permeability of 400 mm 2 for the first branch 2a containing the radiator 5.
• the thermal control means 8 is mounted on the cooling circuit 2 so that at most all the branches 2a, 2b, 2c are open during a maintenance operation of the engine. Thus, it avoids the use of a bleed screw and ensures the filling of the cooling circuit by a jar 9 after each rolling cycle.
• thermal control means 8 consisting of a valve comprising a single plug, that takes an extreme position of displacement which is, for example, -50%> or + 50%> of its range of displacement , corresponding to the maximum permeability for the first branch 2a of 400 mm 2 and for the third branch 2c of 200 mm 2 .
• a way of circumventing the bushel can be used to connect the valve inlet to the 8d outlet.
• Such a means may be an actuator controlled and positioned in a connection duct from the inlet to the outlet 8d.
• each valve is then controlled to position the movable valve in its maximum open position of the associated outlet 8b, 8c or 8d.
• FIG. 3 illustrates an example of a method implemented by the thermal regulation system shown in FIG. 2.
• control system 10 After an initialization step 21 in which all the branches 2a, 2b, 2c are closed, the control system 10 performs, in the step 22, the comparison between the external temperature T Ext and the first threshold value SI, in order to determine the Summer or Winter operating mode.
• the control method 20 comprises a step 23 for comparing the temperature T fm of fluid leaving the engine with a second threshold value S2.
• a second threshold value S2 the opening angle of the valve of the second branch 2b is determined in step 24 by function of the temperature T fm of the fluid at the outlet of the internal combustion engine 3 and of a cartography C.
• the position of displacement of the valve plug of the second branch 2b is, for example, between [-5%; 0%] of its movement range.
• step 25 the temperature difference between the temperature T fa of the fluid upstream of the heater 6 and the temperature T fm of the fluid at the outlet of the internal combustion engine 3 with respect to a fourth threshold value S4.
• a fourth threshold value S4 When the difference between the temperature T fa of the fluid upstream of the heater 6 and the temperature T fm of the fluid at the outlet of the internal combustion engine 3 is less than the fourth threshold value S4, it is determined in step 26, an opening angle of the valve of the third branch 2c, for example, between [10%; 20%] of the maximum opening, thus avoiding any heat shock of the heater.
• step 27 the displacement position of the valve plug of the third branch 2c, for example, between [10%; 15%>] of its movement range.
• the opening angle of the valve of the third branch 2c is also proportional to the temperature T cons of the heating setpoint requested by the user of the vehicle.
• step 28 the temperature of the driving fluid T fm is compared with a fifth threshold value S5.
• the control system closes, in step 29, the third branch 2c containing the heater 6, to warm the engine.
• the position of movement of the valve plug of the third branch 2c for example, between [-5%; 0%>] of its movement range.
• step 30 the temperature of the driving fluid T fm is compared with a third threshold value S3.
• the control system returns to the step 23 for comparing the temperature T fm of fluid output from the engine with a second threshold value S2.
• the control system 10 opens, in step 34, the first branch 2a containing the radiator 5, to further cool the internal combustion engine.
• the position of displacement of the plug of the valve is, for example, between [25%; 45%] of its movement range.
• the control method 20 then comprises a step 35 for comparing the temperature T fm of fluid leaving the engine with a sixth threshold value S6.
• step 36 compares the temperature difference between the temperature T fa of the fluid upstream of the 6 and the temperature T fm of the fluid at the outlet of the internal combustion engine 3 with respect to the fourth threshold value S4.
• step 37 determines whether the difference between the temperature T fa of the fluid upstream of the heater 6 and the temperature T fm the fluid at the output of the internal combustion engine 3 is less than the fourth threshold value S4
• step 37 a position of movement of the valve plug, for example, between [10%>; 20%>] of the maximum opening and when the difference between the temperature T fa of the fluid upstream of the heater and the temperature T fm of the fluid at the outlet of the internal combustion engine is greater than or equal to the fourth threshold value S4, it is determined in step 38, a position of movement of the
• step 39 the temperature of the driving fluid T fm is compared with a seventh threshold value S7.
• the control system closes the third branch 2c containing the heater 6, in order to heat the motor and returns to the step 35 of comparing the temperature T fm of fluid output from the engine with a sixth threshold value S 6.
• the displacement position of the valve plug is, for example, between [0% o; 10% o] of its range of displacement.
• the control method comprises a step 3 1 for comparing the temperature T fm of fluid leaving the motor with a second threshold value S2.
• a second threshold value S2 the opening angle of the valve of the second branch 2b is determined in step 32 by function of the temperature T fm of the fluid at the outlet of the internal combustion engine 3 and of a cartography C.
• the position of displacement of the plug of the valve is, for example, between [- 10%; -20%] of its range of displacement.
• step 33 the temperature of the driving fluid T fm is compared with the third threshold value S3.
• the control system opens, in step 34, the first branch 2a containing the radiator and continues with the steps 35 to 39 described above.
• the position of movement of the plug of the valve is, for example, between [-25%>; -50%>] of its movement range.
• the flow rate of the circulation pump 4 increases, which favors the cooling of the internal combustion engine.
• the position of displacement of the plug of the valve is, for example, between [-40%>; -50%>] of its movement range.
• FIG. 4 illustrates a process example 40 implemented by the thermal control system shown in FIG.
• the control method 40 comprises a step 41 for comparing the temperature T fm of the fluid leaving the engine with a third threshold value S3 and a step 42 for comparing the temperature of the cooling fluid at the level of the turbocharger T AvT with a eighth threshold value S 8.
• the control method 40 actuates, in step 43, the startup of the fan motor unit GMV and closes, at step 44, the third branch 2c containing the heater 6.
• the position of displacement of the plug of the valve is, for example, -40% of its range of displacement.
• the control method 40 comprises a step 45 for comparing the temperature T fm of fluid at the motor output with a seventh threshold value S7 and a step 46 for comparing the temperature T fr of the fluid upstream of the radiator with the seventh value threshold S7.
• the control method 40 actuates, in step 47, the shutdown of the fan unit GMV and opens, in step 48, the third branch 2c containing the heater 6.
• the position of displacement of the plug of the valve is, for example, between [-40%; -50%>] of its range of displacement, preferably of -45%>.
• control method 40 is implemented when the operation of the engine stops, when the coolant no longer circulates.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Air-Conditioning For Vehicles (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)

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• 2016
  • 2016-02-29 FR FR1651664A patent/FR3048260B1/fr active Active
• 2017
  • 2017-02-23 EP EP17714844.2A patent/EP3423690B1/de active Active
  • 2017-02-23 JP JP2018545315A patent/JP6772284B2/ja active Active
  • 2017-02-23 WO PCT/FR2017/050403 patent/WO2017149225A1/fr not_active Ceased
  • 2017-02-23 CN CN201780015884.XA patent/CN108699944B/zh active Active

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