CN109084016A - A kind of DCT speed changer double pump system, control method and automobile - Google Patents
A kind of DCT speed changer double pump system, control method and automobile Download PDFInfo
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- CN109084016A CN109084016A CN201811168252.XA CN201811168252A CN109084016A CN 109084016 A CN109084016 A CN 109084016A CN 201811168252 A CN201811168252 A CN 201811168252A CN 109084016 A CN109084016 A CN 109084016A
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- oil
- pressure
- pump
- accumulator
- low pressure
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0034—Accumulators for fluid pressure supply; Control thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of DCT speed changer double pump system, control method and automobile, to solve the problems, such as that DCT transmission pressure system is because hydraulic system energy consumption caused by a mechanical oil pump is larger in the prior art.The DCT speed changer double pump system, comprising: controller；The driving motor being connect with the controller；Low pressure fuel pump is driven by the driving motor；High-pressure oil pump is driven by the driving motor；The low pressure fuel pump and the high-pressure oil pump operate in the same direction and at the same speed；Cooling and lubricating oil circuit is supplied by the low pressure fuel pump；First check valve is mounted on the outlet end of the high-pressure oil pump；The high voltage control oil circuit and accumulator being arranged in parallel, the high voltage control oil circuit and the accumulator are mounted on the outlet end of first check valve；Accumulator control valve, one end are arranged between first check valve and the high-pressure oil pump by oil circuit, and the other end is connected to by oil circuit with the first oil sump to the high-pressure oil pump fuel feeding.
Description
Technical field
The present invention relates to transmission control field, specifically a kind of DCT speed changer double pump system, control method and automobile.
Background technique
For DCT transmission pressure system as one of main energy consumption of speed changer, energy consumption is always that transmission design is opened
Send out the emphasis of concern.For hydraulic system, power consumption can be simply understood as with the product of system pressure and flow at just
Than.Power source of the oil pump as hydraulic system, energy consumption height are directly related to the energy consumption of hydraulic system, and DCT becomes at present
Fast device is relied on generally by a mechanical oil pump has started operating to be driven to hydraulic system fuel feeding, in order to send out mechanical oil pump
Meet the use demand of speed changer under the motivation slow-speed of revolution, it usually needs design larger displacement oil pump.For single in the prior art
For mechanical oil pump, the maximum pressure demand (high voltage control oil circuit) and maximum stream flow demand of maximum power dissipation and hydraulic system
The product of (cooling and lubricating oil circuit) is directly proportional.
Hydraulic system demand predominantly shift, the high voltage control demand of clutch operating and the low-pressure high-flowrate of cooling and lubricating
Demand, a mechanical oil pump need high pressure and high flow capacity operating condition necessarily occur to meet system.
Summary of the invention
The purpose of the present invention is to provide a kind of DCT speed changer double pump system, control method and automobiles, to solve existing skill
The DCT transmission pressure system problem larger because of hydraulic system energy consumption caused by a mechanical oil pump in art.
The technical solution of the present invention is as follows:
The present invention provides a kind of DCT speed changer double pump systems, comprising: controller；
The driving motor being connect with the controller；
Low pressure fuel pump is driven by the driving motor；
High-pressure oil pump is driven by the driving motor；The low pressure fuel pump and the high-pressure oil pump operate in the same direction and at the same speed；
Cooling and lubricating oil circuit is supplied by the low pressure fuel pump；
First check valve is mounted on the outlet end of the high-pressure oil pump；
The high voltage control oil circuit and accumulator being arranged in parallel, the high voltage control oil circuit and the accumulator are mounted on described first
The outlet end of check valve；
Accumulator control valve, one end are arranged between first check valve and the high-pressure oil pump by oil circuit, the other end
It is connected to by oil circuit with the first oil sump to the high-pressure oil pump fuel feeding；
The controller is used to determine the current operating condition of DCT speed changer according to the kinetic parameter of vehicle, and according to the DCT
The current operating condition of speed changer controls the driving motor and drives the low pressure fuel pump and the high pressure oil with different revolving speeds
Pump, the hydraulic oil for pumping out the low pressure fuel pump is to the cooling and lubricating oil circuit fuel feeding；And pump out the high-pressure oil pump
Hydraulic oil to the high voltage control oil circuit and the accumulator fuel feeding or passes through the accumulator control by first check valve
Valve processed is back in first oil sump.
Preferably, the system also includes: for detecting the pressure-detecting device of the oil pressure in the accumulator, the pressure
Force checking device is connect with the controller, and the controller is specifically used for:
When the kinetic parameter according to vehicle determines that the current operating condition of the DCT speed changer keeps off driving cycle for band, control
It makes the driving motor and the low pressure fuel pump and the high-pressure oil pump is driven with the first revolving speed, make the low pressure fuel pump to described cold
But lubricant passage way carries out fuel feeding, and the oil pressure of the accumulator detected according to the pressure-detecting device, to the accumulator control
The open and-shut mode of valve processed is controlled, and the hydraulic oil for pumping out the high-pressure oil pump is by first check valve to high voltage control
Oil circuit and the accumulator fuel feeding are back in first oil sump by the accumulator control valve；
When the kinetic parameter according to vehicle determines that the current operating condition of the DCT speed changer is that gear switches operating condition, control
The driving motor is made to be greater than the second revolving speed of first revolving speed and drive the low pressure fuel pump and the high-pressure oil pump, makes institute
It states low pressure fuel pump and fuel feeding is carried out to the cooling and lubricating oil circuit, and control the accumulator control valve and open, make the high pressure oil
The hydraulic oil pumped out is back in first oil sump by the accumulator control valve；
Wherein, it is back in first oil sump in the hydraulic oil that the high-pressure oil pump pumps out by the accumulator control valve
When, the output oil pressure of the also described high-pressure oil pump of the controller is reduced to minimum output oil pressure, and the control accumulator pair
The high voltage control oil circuit fuel feeding.
Preferably, the system also includes:
High-pressure safety valve, one end are arranged between the outlet end of the high-pressure oil pump and first check valve by oil circuit,
The other end is connected to by oil circuit with first oil sump；
Low-pressure safety valve, one end are connected to by oil circuit with the input end of the low pressure fuel pump, the other end pass through oil circuit with it is described
The outlet end of low pressure fuel pump is connected to；
When the high-pressure safety valve is greater than the first predetermined difference value for the difference between its input pressure and out oil pressure, conducting
Connection between the outlet end of the high-pressure oil pump and first oil sump；The low-pressure safety valve is used in its input pressure
Out the difference between oil pressure be greater than the second predetermined difference value when, be connected the low pressure fuel pump outlet end and the low pressure fuel pump
Input end.
Preferably, the system also includes:
First filter is arranged in the input end of the low pressure fuel pump and carries out the second oily bottom of fuel feeding to the low pressure fuel pump
Between shell；
The cooler and the second filter being successively set between the outlet end of the low pressure fuel pump and the cooling and lubricating oil circuit.
Preferably, the system also includes:
Cooler by-passing valve, one end are connected between the cooler and the outlet end of the low pressure fuel pump, the other end and institute
State the connection of cooling and lubricating oil circuit；
The cooler by-passing valve be used for its input pressure and out the difference of oil pressure be greater than third predetermined difference value when, conducting institute
State low pressure fuel pump outlet end and the cooling and lubricating oil circuit.
Preferably, the system also includes:
Current limliting oil duct, one end are connected to the outlet end of the low pressure fuel pump, and the other end is connected to first oil sump, described
Restricted orifice is set in current limliting oil duct；
Second one-way valve is installed in the current limliting oil duct, and the hydraulic oil for pumping out the low pressure fuel pump flows into institute
It states in the first oil sump.
Preferably, to the high-pressure oil pump carry out fuel feeding the first oil sump and to the second oil sump of the low pressure fuel pump
For same oil sump, or, first oil sump and second oil sump are two oil sumps with different capabilities.
Preferably, the oil pump capacity of the high-pressure oil pump is less than the oil pump capacity of the low pressure fuel pump, the high-pressure oil pump
It is electronic pump with the low pressure fuel pump, the operating oil pressure of the high-pressure oil pump is located at 60bar between 70bar, the low pressure
The operating oil pressure of oil pump is 5bar.
According to another aspect of the present invention, the present invention also provides a kind of automobiles, including above-mentioned DCT speed changer double pump system
System.
According to another aspect of the present invention, it the present invention also provides a kind of control method of DCT speed changer double pump system, answers
For above-mentioned DCT speed changer double pump system, which comprises
Obtain the kinetic parameter of vehicle；
According to the kinetic parameter, the current operating condition of DCT speed changer is determined；
The driving motor is controlled according to the current operating condition of the DCT speed changer, and the low pressure oil is driven with different revolving speeds
Pump and the high-pressure oil pump, the hydraulic oil for pumping out the low pressure fuel pump is to the cooling and lubricating oil circuit fuel feeding；And make described
The hydraulic oil that high-pressure oil pump pumps out to the high voltage control oil circuit and the accumulator fuel feeding or is led to by first check valve
The accumulator control valve is crossed to be back in first oil sump.
Preferably, the controller is specifically used for:
When the current operating condition for determining DCT speed changer is band gear driving cycle, the driving motor is controlled with first turn
Speed drives the low pressure fuel pump and the high-pressure oil pump, makes the low pressure fuel pump to the cooling and lubricating oil circuit fuel feeding, and according to
The oil pressure for the accumulator that pressure-detecting device detects controls the open and-shut mode of the accumulator control valve, makes described
The hydraulic oil that high-pressure oil pump pumps out to high voltage control oil circuit and the accumulator fuel feeding or passes through institute by first check valve
Accumulator control valve is stated to be back in first oil sump；
When the current operating condition for determining DCT speed changer is that gear switches operating condition, the driving motor is controlled to be greater than institute
The second revolving speed for stating the first revolving speed drives the low pressure fuel pump and the high-pressure oil pump, makes the low pressure fuel pump to the cooling profit
Lubricating oil road fuel feeding, and control the accumulator control valve and open, the hydraulic oil for pumping out the high-pressure oil pump passes through the accumulation of energy
Device control valve is back in first oil sump；
Wherein, it is back in first oil sump in the hydraulic oil that the high-pressure oil pump pumps out by the accumulator control valve
When, the output oil pressure for also controlling the high-pressure oil pump is reduced to minimum output oil pressure, and the control accumulator to the height
Voltage-controlled liquefaction road fuel feeding.
Preferably, the oil pressure of the accumulator detected according to pressure-detecting device, the opening and closing to the accumulator control valve
State is controlled, and the hydraulic oil for pumping out the high-pressure oil pump is by first check valve to high voltage control oil circuit and described
Accumulator fuel feeding by the step that the accumulator control valve is back in first oil sump includes:
If the oil pressure for the accumulator that the pressure-detecting device detects is greater than or equal to predetermined oil pressure value, accumulator control is controlled
Valve processed is opened, and the hydraulic oil for pumping out the high-pressure oil pump is back to first oil sump by the accumulator control valve
It is interior；
If the oil pressure for the accumulator that the pressure-detecting device detects is less than predetermined oil pressure value, accumulator control valve pass is controlled
Disconnected, the hydraulic oil for pumping out the high-pressure oil pump supplies high voltage control oil circuit and the accumulator by first check valve
Oil.
The invention has the benefit that
Fuel feeding is carried out to high voltage control circuit and cooling and lubricating oil circuit respectively by two oil pumps with different displacements of control, is pressed
Pump oil control is carried out to oil pump according to cooling and lubricating oil circuit demand；Meanwhile controller controls a driving motor and is rotated, and realizes
High-pressure oil pump and low pressure fuel pump are driven simultaneously, so that maximum pressure demand and minimum that the maximum oil consumption of whole system is reduced to
The product and the minimum pressure demand of cooling and lubricating oil circuit and the sum of products of minimum discharge of flow, or be high voltage control oil circuit
Minimum pressure demand and maximum stream flow product and cooling and lubricating oil circuit minimum pressure demand and maximum stream flow product it
With can increase substantially speed changer fuel-economy performance, reduce system oil consumption.
Detailed description of the invention
Fig. 1 is the structure chart of DCT speed changer double pump system of the invention；
Fig. 2 is the flow chart of the control method of DCT speed changer double pump system of the invention；
Description of symbols: 1, driving motor；2, low pressure fuel pump；3, high-pressure oil pump；4, cooling and lubricating oil circuit；5, first is unidirectional
Valve；6, high voltage control oil circuit；7, accumulator；8, accumulator control valve；9, the first oil sump；10, high-pressure safety valve；11, low pressure
Safety valve；12, first filter；13, the second oil sump；14, cooler；15, the second filter；16, cooler by-passing valve；
17, current limliting oil duct；18, second one-way valve.
Specific embodiment
Referring to Fig.1, the present invention provides a kind of DCT speed changer double pump systems, comprising: controller；Connect with the controller
The driving motor 1 connect；Low pressure fuel pump 2 is driven by the driving motor 1；High-pressure oil pump 3 passes through the driving motor 1
Driving；The low pressure fuel pump 2 and the high-pressure oil pump 3 operate in the same direction and at the same speed；Cooling and lubricating oil circuit 4 passes through the low pressure
Oil pump 2 supplies；First check valve 5 is mounted on the outlet end of the high-pressure oil pump 3；6 He of high voltage control oil circuit being arranged in parallel
Accumulator 7, the high voltage control oil circuit 6 and the accumulator 7 are mounted on the outlet end of first check valve 5；Accumulator control
Valve 8 processed, one end by oil circuit be arranged between first check valve 5 and the high-pressure oil pump 3, the other end by oil circuit with
The first oil sump 9 connection to 3 fuel feeding of high-pressure oil pump；The controller is used to determine DCT according to the kinetic parameter of vehicle
The current operating condition of speed changer, and the driving motor 1 is controlled with difference according to the current operating condition of the DCT speed changer
Revolving speed drive the low pressure fuel pump 2 and the high-pressure oil pump 3, the hydraulic oil for pumping out the low pressure fuel pump 2 is to the cooling
4 fuel feeding of lubricant passage way；And the hydraulic oil for pumping out the high-pressure oil pump 3 is voltage-controlled to the height by first check valve 5
Liquefaction road 6 and 7 fuel feeding of the accumulator are back in first oil sump 9 by the accumulator control valve 8.
Wherein, low pressure fuel pump 2 is different with the oil pump capacity of high-pressure oil pump 3, and the oil pump capacity of low pressure fuel pump 2 is greater than high pressure oil
The oil pump capacity of pump 3.Driving motor 1 simultaneously drives low pressure fuel pump 2 and high-pressure oil pump 3, low pressure fuel pump 2 and high-pressure oil pump
3 under the driving of driving motor 1, are rotated in the same direction with same rotational speed.For the first check valve 5, it is needed
Input pressure, which is greater than oil pressure, to be connected, if its input pressure deteriorates to less than out the state of oil pressure, first is single
It can then be turned off to valve 5.
Wherein, in this application, system further include:, should for detecting the pressure-detecting device of the oil pressure in accumulator 7
Pressure-detecting device is connect with controller.Wherein, it in the application, goes when determining that the operating condition of the DCT speed changer keeps off for band
When sailing operating condition, driving motor 1 drives low pressure fuel pump 2 and high-pressure oil pump 3 with the first revolving speed, so that low pressure fuel pump 2 is to cooling and lubricating
Oil circuit 4 carries out fuel feeding, meanwhile, controller determines the liquid that high-pressure oil pump 3 pumps out according to the oil pressure that pressure-detecting device detects
The trend of pressure oil.The selection of speed of driving motor 1 is determined according to the oil mass demand of the cooling and lubricating oil circuit 4, if cooling
The oil mass demand of lubricant passage way 4 is small, then driving motor 1 is rotated with lesser revolving speed；If the oil mass of cooling and lubricating oil circuit 4 needs
Ask big, then driving motor 1 is rotated with biggish revolving speed.Specifically, the DCT is determined in the kinetic parameter according to vehicle
When the current operating condition of speed changer is band gear driving cycle, the driving motor 1 is controlled with the first revolving speed and drives the low pressure
Oil pump 2 and the high-pressure oil pump 3, and the oil pressure of the accumulator 7 detected in the pressure-detecting device be greater than or equal to it is predetermined
When oil pressure value, control accumulator control valve 8 is opened, and the hydraulic oil for pumping out the high-pressure oil pump 3 is controlled by the accumulator
Valve 8 is back in first oil sump 9, also, in the process, and controller also controls high-pressure oil pump 3 and outputs it oil pressure
It is reduced to minimum output oil pressure, meanwhile, control accumulator 7 is to 6 fuel feeding of high voltage control oil circuit, with this condition, 2 institute of low pressure fuel pump
The energy of consuming is the product of big flow and low oil pressure, and energy spent by high-pressure oil pump 3 is the product of big flow and small oil pressure.
In addition, control accumulator control valve 8 is closed when the oil pressure for the accumulator 7 that pressure-detecting device detects is less than predetermined oil pressure value
Disconnected, the hydraulic oil for pumping out the high-pressure oil pump 3 is by first check valve 5 to high voltage control oil circuit 6 and the accumulator 7
Fuel feeding.In this way, under such condition, energy spent by low pressure fuel pump 2 is the product of small flow and low oil pressure, high-pressure oil pump 3
Spent energy is the product of small flow and big oil pressure.
Speed changer be in gear switching operating condition when, for cooling and lubricating oil circuit 4, needed for lubricants capacity demand
Increase, therefore, becomes larger for the speed demand of driving motor 1, specially increase to the second revolving speed greater than the first revolving speed.?
Under two speed conditions, high-pressure oil pump 3 can be made to pump out a large amount of high hydraulic oil, be more than that the hydraulic oil of high voltage control oil circuit 6 needs
It asks, therefore, if in this case, the hydraulic oil that high-pressure oil pump 3 pumps out continues to supply high voltage control oil circuit 6, and it will cause energy
Waste, therefore, in this case, controller controls accumulator control valve 8 and opens, so that the hydraulic oil that high-pressure oil pump 3 pumps out is logical
The accumulator control valve 8 is crossed to be back in the first oil sump 9；Simultaneously as accumulator control valve 8 is opened, high pressure oil can be made
The outlet pressure (i.e. the inlet pressure of the first check valve 5) of pump 3 reduces, and causes the first check valve 5 to turn off, being finally reached makes high pressure
The hydraulic oil that oil pump 3 pumps out will not flow into the effect of 7 side of high voltage control oil circuit 6 and accumulator again under this operating condition.Specifically
Ground, when speed changer is in gear switching operating condition, which is specifically used for: controlling the driving motor 1 to be greater than second
Revolving speed drives the low pressure fuel pump 2 and the high-pressure oil pump 3, and control accumulator control valve 8 is opened, and pumps the high-pressure oil pump 3
Hydraulic oil out is back in first oil sump 9 by the accumulator control valve 8, realizes that oil mass recycles.Also,
Under such operating condition, it is not necessarily to be 7 fuel feeding of high voltage control oil circuit 6 and accumulator due to the hydraulic oil that high-pressure oil pump 3 pumps out, it can be right
The oil pressure of high-pressure oil pump 3 is adjusted, and the oil pressure of high-pressure oil pump 3 is made to be reduced to minimum.In this way, under this operating condition, low pressure fuel pump 2
Spent energy is the product of big flow and low oil pressure, and energy spent by high-pressure oil pump 3 is then big energy and low hydraulic
Product.
To sum up, DCT speed changer double pump system through the invention, no matter any one in the above two operating condition of speed changer
Operating condition, for high-pressure oil pump 3 and low pressure fuel pump 2, the two consumes energy the total of single lubricating oil pump respectively less than in the prior art
Energy consumption, therefore, can reduce the energy consumption of entire DCT speed changer double pump system.
In addition, referring to Fig.1, the system is also wrapped in order to improve the security performance of the DCT speed changer double pump system of the application
Include: high-pressure safety valve 10, one end by oil circuit be arranged in the high-pressure oil pump 3 outlet end and first check valve 5 it
Between, the other end is connected to by oil circuit with first oil sump 9；Low-pressure safety valve 11, one end pass through oil circuit and the low pressure
The input end of oil pump 2 is connected to, and the other end is connected to by oil circuit with the outlet end of the low pressure fuel pump 2；The high-pressure safety valve 10
When being greater than the first predetermined difference value for the difference between its input pressure and out oil pressure, going out for the high-pressure oil pump 3 is connected
Connection between mouth end and first oil sump 9；The low-pressure safety valve 11 be used for its input pressure and out oil pressure it
Between difference be greater than the second predetermined difference value when, the outlet end of the low pressure fuel pump 2 and the input end of the low pressure fuel pump 2 is connected.
When the difference between the input pressure of high-pressure safety valve 10 and out oil pressure is greater than the first predetermined difference value, show height
The pressure of the outlet end of 3 side of pressure oil pump alreadys exceed system design temperature, in order to improve the security performance of system, high-voltage safety
Valve 10 is connected, so that the high pressure oil that high-pressure oil pump 3 pumps out is partly refluxed in the first oil sump 9, reduces the outlet of high-pressure oil pump 3
The oil pressure at end；Similarly, the setting purpose of low-pressure safety valve 11 is, the pressure in the outlet end of low pressure fuel pump 2 is more than system
Design pressure, in order to improve security of system energy, after low-pressure safety valve 10 is connected, so that the oil pressure of the outlet end of low pressure fuel pump 2
Declined.
In addition, in order to improve the hydraulic accuracy for being supplied to cooling and lubricating oil circuit 4, as shown in Figure 1, the system is also wrapped
Include: first filter 12 is arranged in the input end of the low pressure fuel pump 2 and carries out the second of fuel feeding to the low pressure fuel pump 2
Between oil sump 13；The cooler 14 being successively set between the outlet end of the low pressure fuel pump 2 and the cooling and lubricating oil circuit 4
With the second filter 15.Wherein, first filter 12 carries out coarse filtration for the hydraulic oil that the second oil sump 13 provides, through too low
The low pressure oil that pressure oil pump 2 pumps out is carrying out smart filtering through the cooling of subcooler 14 and by the second filter 15, improves hydraulic
Accuracy.
Impurity excessively causes the second filter 15 that can not filter out and meets cooling and lubricating in the second filter 15 in order to prevent
The high-volume hydraulic oil that oil circuit 4 needs, referring to Fig.1, in this application, the system also includes: cooler by-passing valve 16, one
End is connected between the cooler 14 and the outlet end of the low pressure fuel pump 2, and the other end and the cooling and lubricating oil circuit 4 connect
It is logical；The cooler by-passing valve 16 be used for its input pressure and out the difference of oil pressure be greater than third predetermined difference value when, be connected
The outlet end of the low pressure fuel pump 2 and the cooling and lubricating oil circuit 4.
The setting purpose of the cooler by-passing valve 16 is, when the second filter 15 is partially blocked or is all blocked,
Not high low hydraulic oil of precision is transferred to cooling and lubricating oil circuit 4 by it, guarantees that system associated components are at lubrication shape
State.
In addition, the two can be designed as same oil for the first oil sump 9 and the second oil sump 13 in the application
Bottom case, or it is designed as the oil sump with different capabilities.It wherein, is mutually solely in the first oil sump 9 and the second oil sump 13
When erecting two oil sumps set, the capacity of the first oil sump 9 less than the second oil sump 13 capacity, as shown in Figure 1, the system
System further include: current limliting oil duct 17, one end are connected to the outlet end of the low pressure fuel pump 2, the other end and first oil sump 9
It is connected to, restricted orifice is set in the current limliting oil duct 17；Second one-way valve 18 is installed in the current limliting oil duct 17, is used for
The hydraulic oil for pumping out the low pressure fuel pump 2 flows into first oil sump 9.Since the capacity of the first oil sump 9 is smaller,
After it is 7 fuel feeding of high voltage control oil circuit 6 and accumulator, the oil mass in the first oil sump 9 is gradually decreased, and low pressure fuel pump 2 pumps out
Low pressure oil flowed into the first oil sump 9 by restricted flow passage 17, carry out supplement oil mass for the first oil sump 9.In current limliting oil
The design of metering hole in road 17, the hydraulic oil that can prevent low pressure fuel pump 2 from pumping out is excessive to be flowed into the first oil sump 9.
In addition, in this application, the high-pressure oil pump 3 and the low pressure fuel pump 2 are electronic pump, the high-pressure oil pump 3
Operating oil pressure be located at 60bar between 70bar, the operating oil pressure of the low pressure fuel pump 2 is 5bar.
For speed changer, the hydraulic oil that demand oil pressure is small but flow is big of cooling and lubricating oil circuit 4, high voltage control oil circuit 6
The hydraulic oil that demand oil pressure is big but flow is small, for needing in the prior art simultaneously for high voltage control oil circuit 6 and cutting oil
Road 4 carries out for the single mechanical oil pump of pump oil, and the maximum pressure of maximum power dissipation and hydraulic system mesohigh control oil circuit 6 needs
The product of the maximum stream flow demand of summation cooling and lubricating oil circuit 4 is proportional.And in this application, low pressure fuel pump 2 sets for huge discharge
Meter, high-pressure oil pump 3 design for small displacement, and the discharge capacity of low pressure fuel pump 2 is greater than the discharge capacity of high-pressure oil pump 3, in this way, oil pump can be avoided
Maximum pressure and maximum stream flow product big power consumption operating point.When system requirements high flow capacity, by improving 1 turn of driving motor
Speed, enable low pressure fuel pump 2 pump out meet cooling and lubricating oil circuit 4 needed for high-volume hydraulic oil；When system requirements low discharge
When, by reducing by 1 revolving speed of driving motor, low pressure fuel pump 2 is enabled to pump out small flow liquid needed for meeting cooling and lubricating oil circuit 4
Pressure oil.For system provided by the invention, the energy of system is the maximum pressure demand and minimum discharge of high voltage control oil circuit 6
Product and the minimum pressure demand of cooling and lubricating oil circuit 4 and the sum of products of minimum discharge, or be high voltage control oil circuit 6
The product of the minimum pressure demand of the product of minimum pressure demand and maximum stream flow and cooling and lubricating oil circuit 4 and maximum stream flow it
With.Therefore, by reasonably designing two oil pumps with different displacements respectively to high voltage control oil circuit 6 and cutting oil
Road 4 carries out fuel feeding, can reduce energy loss caused by a mechanical oil pump.To sum up, the present invention can increase substantially speed changer
Fuel-economy performance reduces system oil consumption.
According to another aspect of the present invention, the present invention also provides a kind of automobiles, including above-mentioned DCT speed changer double pump system
System.
According to another aspect of the present invention, referring to Fig. 2, the present invention also provides a kind of controls of DCT speed changer double pump system
Method processed, applied to above-mentioned DCT speed changer double pump system, which comprises
Step 1, the kinetic parameter of vehicle is obtained.
Step 2, the current operating condition of DCT speed changer is determined according to the kinetic parameter of the vehicle.
The kinetic parameter of vehicle includes the current vehicle speed and gas pedal aperture of vehicle, and controller can be transmission control
Unit TCU, pre-selection is stored between the current operating condition of current vehicle speed, gas pedal aperture and speed changer in the controller
Mapping table can be true by searching information corresponding with current vehicle speed and gas pedal aperture in the mapping table
The fixed current operating condition.
Step 3, the driving motor 1 is controlled according to the current operating condition of the DCT speed changer to drive with different revolving speeds
The low pressure fuel pump 2 and the high-pressure oil pump 3 are moved, the hydraulic oil for pumping out the low pressure fuel pump 2 is to the cooling and lubricating oil circuit 4
Fuel feeding；And the hydraulic oil for pumping out the high-pressure oil pump 3 by first check valve 5 to 6 He of high voltage control oil circuit
7 fuel feeding of accumulator is back in first oil sump 9 by the accumulator control valve 8.
Specifically, controlling the driving when the current operating condition for determining DCT speed changer is that gear switches operating condition
Motor 1 drives the low pressure fuel pump 2 and the high-pressure oil pump 3, and the storage detected according to pressure-detecting device with the first revolving speed
The oil pressure of energy device 7, controls the open and-shut mode of the accumulator control valve 8, the hydraulic oil for pumping out the high-pressure oil pump 3
It is returned by first check valve 5 to high voltage control oil circuit 6 and 7 fuel feeding of the accumulator or by the accumulator control valve 8
It flow in first oil sump 9；
When the current operating condition for determining DCT speed changer is band gear driving cycle, the driving motor 1 is controlled to be greater than institute
The second revolving speed for stating the first revolving speed drives the low pressure fuel pump 2 and the high-pressure oil pump 3, and controls the accumulator control valve 8
It opens, the hydraulic oil for pumping out the high-pressure oil pump 3 is back in first oil sump 9 by the accumulator control valve 8；
Wherein, first oil sump is back to by the accumulator control valve 8 in the hydraulic oil that the high-pressure oil pump 3 pumps out
It when in 9, also controls the high-pressure oil pump 3 and outputs it oil pressure and be reduced to minimum output oil pressure, and the control accumulator 7 is right
6 fuel feeding of high voltage control oil circuit.
Specifically, the oil pressure of the accumulator 7 detected according to pressure-detecting device, to opening for the accumulator control valve 8
Closed state is controlled, and the hydraulic oil for pumping out the high-pressure oil pump 3 is by first check valve 5 to high voltage control oil circuit 6
Include: with 7 fuel feeding of accumulator or by the step that the accumulator control valve 8 is back in first oil sump 9
If the oil pressure for the accumulator 7 that the pressure-detecting device detects is greater than or equal to predetermined oil pressure value, accumulator is controlled
Control valve 8 is opened, and the hydraulic oil for pumping out the high-pressure oil pump 3 is back to first oil by the accumulator control valve 8
In bottom case 9；
If the oil pressure for the accumulator 7 that the pressure-detecting device detects is less than predetermined oil pressure value, accumulator control valve 8 is controlled
Shutdown, the hydraulic oil for pumping out the high-pressure oil pump 3 is by first check valve 5 to high voltage control oil circuit 6 and the accumulation of energy
7 fuel feeding of device.
In driving motor 1 in the first revolving speed rotary course, high-pressure oil pump 3 and high voltage control oil is connected in the first check valve 5
The fuel feeding of 3 pairs of the two of high-pressure oil pump is realized in connection between road 6 and accumulator 7；In the process, low pressure fuel pump 3 is with biggish
Flow carries out fuel feeding to cooling and lubricating oil circuit 4.
The control method of the above-mentioned DCT speed changer double pump system of the present invention, controller have different rows by control two
The oil pump of amount carries out fuel feeding to high voltage control circuit 6 and cooling and lubricating oil circuit 4 respectively, can be according to high voltage control oil circuit 6 and cold
But 4 demand of lubricant passage way carries out pump oil control to oil pump；Meanwhile controller controls a driving motor 1 and is rotated, realization pair
High-pressure oil pump 3 and low pressure fuel pump 2 drive simultaneously, so that the maximum oil consumption of whole system is the maximum pressure of high voltage control oil circuit 6
The product of demand and minimum discharge and the minimum pressure demand of cooling and lubricating oil circuit 4 and the sum of products of minimum discharge, Huo Zhewei
The minimum pressure demand of the product and cooling and lubricating oil circuit 4 of the minimum pressure demand of high voltage control oil circuit 6 and maximum stream flow and most
The sum of products of big flow can increase substantially speed changer fuel-economy performance, reduce system oil consumption.
Claims (12)
1. a kind of DCT speed changer double pump system characterized by comprising controller；
The driving motor (1) being connect with the controller；
Low pressure fuel pump (2) is driven by the driving motor (1)；
High-pressure oil pump (3) is driven by the driving motor (1)；The low pressure fuel pump (2) and the high-pressure oil pump (3) are same
To and synchronized operating；
Cooling and lubricating oil circuit (4) is supplied by the low pressure fuel pump (2)；
First check valve (5), is mounted on the outlet end of the high-pressure oil pump (3)；
The high voltage control oil circuit (6) and accumulator (7) being arranged in parallel, the high voltage control oil circuit (6) and the accumulator (7) peace
Mounted in the outlet end of first check valve (5)；
Accumulator control valve (8), one end by oil circuit be arranged first check valve (5) and the high-pressure oil pump (3) it
Between, the other end is connected to by oil circuit with the first oil sump (9) to the high-pressure oil pump (3) fuel feeding；
The controller is used to determine the current operating condition of DCT speed changer according to the kinetic parameter of vehicle, and according to the DCT
The current operating condition of speed changer controls the driving motor (1) and drives the low pressure fuel pump (2) and described with different revolving speeds
High-pressure oil pump (3), the hydraulic oil for pumping out the low pressure fuel pump (2) is to cooling and lubricating oil circuit (4) fuel feeding；And make described
The hydraulic oil that high-pressure oil pump (3) pumps out is by first check valve (5) to the high voltage control oil circuit (6) and the accumulator
(7) it fuel feeding or is back in first oil sump (9) by the accumulator control valve (8).
2. system according to claim 1, which is characterized in that the system also includes: for detecting the accumulator (7)
The pressure-detecting device of interior oil pressure, the pressure-detecting device are connect with the controller, and the controller is specifically used for:
When the kinetic parameter according to vehicle determines that the current operating condition of the DCT speed changer keeps off driving cycle for band, control
It makes the driving motor (1) and the low pressure fuel pump (2) and the high-pressure oil pump (3) is driven with the first revolving speed, make the low pressure oil
Pump the accumulator (7) that (2) carry out fuel feeding, and detect according to the pressure-detecting device to the cooling and lubricating oil circuit (4)
Oil pressure controls the open and-shut mode of the accumulator control valve (8), and the hydraulic oil for pumping out the high-pressure oil pump (3) is logical
First check valve (5) is crossed to control to high voltage control oil circuit (6) and the accumulator (7) fuel feeding or by the accumulator
Valve (8) is back in first oil sump (9)；
When the kinetic parameter according to vehicle determines that the current operating condition of the DCT speed changer is that gear switches operating condition, control
The driving motor (1) is made to be greater than the second revolving speed of first revolving speed and drive the low pressure fuel pump (2) and the high pressure oil
It pumps (3), makes the low pressure fuel pump (2) to cooling and lubricating oil circuit (4) fuel feeding, and control the accumulator control valve (8) and open
It opens, the hydraulic oil for pumping out the high-pressure oil pump (3) is back to first oil sump by the accumulator control valve (8)
(9) in；
Wherein, first oil is back to by the accumulator control valve (8) in the hydraulic oil that the high-pressure oil pump (3) pumps out
When bottom case (9) is interior, the output oil pressure that the controller also controls the high-pressure oil pump (3) is reduced to minimum output oil pressure, and
The accumulator (7) is controlled to high voltage control oil circuit (6) fuel feeding.
3. system according to claim 1, which is characterized in that the system also includes:
High-pressure safety valve (10), one end are arranged by oil circuit in the outlet end of the high-pressure oil pump (3) and described first unidirectional
Between valve (5), the other end is connected to by oil circuit with first oil sump (9)；
Low-pressure safety valve (11), one end are connected to by oil circuit with the input end of the low pressure fuel pump (2), and the other end passes through oil circuit
It is connected to the outlet end of the low pressure fuel pump (2)；
When the high-pressure safety valve (10) is greater than the first predetermined difference value for the difference between its input pressure and out oil pressure,
The connection between the outlet end of the high-pressure oil pump (3) and first oil sump (9) is connected；The low-pressure safety valve (11) is used
When the difference between its input pressure and out oil pressure is greater than the second predetermined difference value, going out for the low pressure fuel pump (2) is connected
The input end at mouth end and the low pressure fuel pump (2).
4. system according to claim 1, which is characterized in that the system also includes:
First filter (12) is arranged in the input end of the low pressure fuel pump (2) and carries out fuel feeding to the low pressure fuel pump (2)
The second oil sump (13) between；
The cooler (14) that is successively set between the outlet end of the low pressure fuel pump (2) and the cooling and lubricating oil circuit (4) and
Second filter (15).
5. system according to claim 4, which is characterized in that the system also includes:
Cooler by-passing valve (16), one end are connected between the cooler (14) and the outlet end of the low pressure fuel pump (2),
The other end is connected to the cooling and lubricating oil circuit (4)；
The cooler by-passing valve (16) is used to lead in its input pressure and when the difference of oil pressure is greater than third predetermined difference value out
Lead to outlet end and the cooling and lubricating oil circuit (4) of the low pressure fuel pump (2).
6. system according to claim 1, which is characterized in that the system also includes:
Current limliting oil duct (17), one end are connected to the outlet end of the low pressure fuel pump (2), the other end and first oil sump
(9) it is connected to, restricted orifice is set in the current limliting oil duct (17)；
Second one-way valve (18) is installed in the current limliting oil duct (17), hydraulic for pumping out the low pressure fuel pump (2)
Oil flows into first oil sump (9).
7. system according to claim 4, which is characterized in that the high-pressure oil pump (3) are carried out with the first oily bottom of fuel feeding
Shell (9) and be same oil sump to the second oil sump (13) of the low pressure fuel pump (2), or, first oil sump (9) and institute
Stating the second oil sump (13) is two oil sumps with different capabilities.
8. system according to claim 1, which is characterized in that the oil pump capacity of the high-pressure oil pump (3) is less than described low
The oil pump capacity of pressure oil pump (2), the high-pressure oil pump (3) and the low pressure fuel pump (2) are electronic pump, the high-pressure oil pump
(3) operating oil pressure is located at 60bar between 70bar, and the operating oil pressure of the low pressure fuel pump (2) is 5bar.
9. a kind of automobile, which is characterized in that including the described in any item DCT speed changer double pump systems of claim 1 to 8.
10. a kind of control method of DCT speed changer double pump system is applied to the described in any item DCT speed changes of claim 1 to 7
Device double pump system, which is characterized in that the described method includes:
Obtain the kinetic parameter of vehicle；
According to the kinetic parameter, the current operating condition of DCT speed changer is determined；
It is described low with different revolving speed drivings that the driving motor (1) is controlled according to the current operating condition of the DCT speed changer
Pressure oil pump (2) and the high-pressure oil pump (3), the hydraulic oil for pumping out the low pressure fuel pump (2) is to the cooling and lubricating oil circuit (4)
Fuel feeding；And the hydraulic oil for pumping out the high-pressure oil pump (3) by first check valve (5) to the high voltage control oil circuit
(6) it and the accumulator (7) fuel feeding or is back in first oil sump (9) by the accumulator control valve (8).
11. control method according to claim 10, which is characterized in that the controller is specifically used for:
When the current operating condition for determining DCT speed changer is band gear driving cycle, the driving motor (1) is controlled with first
Revolving speed drives the low pressure fuel pump (2) and the high-pressure oil pump (3), makes the low pressure fuel pump (2) to the cooling and lubricating oil circuit
(4) fuel feeding, and the oil pressure of the accumulator (7) detected according to pressure-detecting device, the opening and closing to the accumulator control valve (8)
State is controlled, and the hydraulic oil for pumping out the high-pressure oil pump (3) is by first check valve (5) to high voltage control oil circuit
(6) it and the accumulator (7) fuel feeding or is back in first oil sump (9) by the accumulator control valve (8)；
When the current operating condition for determining DCT speed changer is that gear switches operating condition, the driving motor (1) is controlled to be greater than
Second revolving speed of first revolving speed drives the low pressure fuel pump (2) and the high-pressure oil pump (3), makes the low pressure fuel pump (2)
To cooling and lubricating oil circuit (4) fuel feeding, and the accumulator control valve (8) unlatching is controlled, pumps out the high-pressure oil pump (3)
Hydraulic oil be back in first oil sump (9) by the accumulator control valve (8)；
Wherein, first oil is back to by the accumulator control valve (8) in the hydraulic oil that the high-pressure oil pump (3) pumps out
When bottom case (9) is interior, the output oil pressure for also controlling the high-pressure oil pump (3) is reduced to minimum output oil pressure and the accumulator
(7) to high voltage control oil circuit (6) fuel feeding.
12. according to the method for claim 11, which is characterized in that the accumulator (7) detected according to pressure-detecting device
Oil pressure, the open and-shut mode of the accumulator control valve (8) is controlled, the hydraulic oil for pumping out the high-pressure oil pump (3)
To high voltage control oil circuit and the accumulator fuel feeding or pass through the accumulator control valve (8) by first check valve (5)
The step being back in first oil sump (9) includes:
If the oil pressure for the accumulator (7) that the pressure-detecting device detects is greater than or equal to predetermined oil pressure value, accumulation of energy is controlled
Device control valve (8) is opened, and the hydraulic oil for pumping out the high-pressure oil pump (3) is back to institute by the accumulator control valve (8)
It states in the first oil sump (9)；
If the oil pressure for the accumulator (7) that the pressure-detecting device detects is less than predetermined oil pressure value, accumulator control is controlled
Valve (8) shutdown, the hydraulic oil for pumping out the high-pressure oil pump (3) is by first check valve (5) to high voltage control oil circuit (6)
With the accumulator (7) fuel feeding.
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| CN201811168252.XA CN109084016B (en) | 2018-10-08 | 2018-10-08 | DCT transmission double-pump system, control method and automobile |
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| CN201811168252.XA CN109084016B (en) | 2018-10-08 | 2018-10-08 | DCT transmission double-pump system, control method and automobile |
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| CN113565948B (en) * | 2021-06-18 | 2023-09-12 | 东风汽车集团股份有限公司 | Cooling and lubricating system of hybrid gearbox and hybrid vehicle |
| WO2023001924A1 (en) * | 2021-07-22 | 2023-01-26 | Mercedes-Benz Group AG | Supply device for supplying a drive unit of a motor vehicle, method for operating a supply device of this type, and motor vehicle |
| CN115574078A (en) * | 2022-12-08 | 2023-01-06 | 盛瑞传动股份有限公司 | Oil path control device, oil path system and vehicle |
| CN116538291A (en) * | 2023-05-08 | 2023-08-04 | 蜂巢传动科技邳州有限公司 | Control method of gearbox electrohydraulic control system |
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