CN113306388B - Dual-motor electro-hydraulic hybrid driving system - Google Patents
Dual-motor electro-hydraulic hybrid driving system Download PDFInfo
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- CN113306388B CN113306388B CN202110506681.9A CN202110506681A CN113306388B CN 113306388 B CN113306388 B CN 113306388B CN 202110506681 A CN202110506681 A CN 202110506681A CN 113306388 B CN113306388 B CN 113306388B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
- B60K17/105—Units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/02—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of clutch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
- B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a double-motor electro-hydraulic hybrid driving system and a control method thereof, wherein the double-motor electro-hydraulic hybrid driving system comprises the following steps: the hydraulic oil pump, hydraulic oil pump clutch, the accumulator, the overflow valve, the check valve, first motor, first clutch, first stopper, planetary gear mechanism, the second stopper, the second motor, the second clutch, gearbox input shaft hydraulic drive gear, the third clutch, the fourth clutch, gearbox output shaft hydraulic drive gear, drive control unit, the solenoid valve, drive hydraulic motor, gearbox output shaft coupling gear, the gearbox, gearbox input shaft coupling gear. The mechanical coupling relation and the power splitting principle of the planetary gear train are utilized, the clutch and the brake are combined at the same time, two groups of driving motors are adopted, and the working states of the two groups of motors are dynamically adjusted, so that the effect of greatly expanding the high-efficiency working area of the driving system under different power requirements is achieved.
Description
Technical Field
The invention relates to the field of hydraulic systems of pure electric vehicles, in particular to a dual-motor electro-hydraulic hybrid driving system.
Background
On the occasions of frequent heavy load starting, heavy load climbing, frequent heavy load starting and stopping and non-road heavy load low-speed running working conditions, or vehicles with hydraulic operation equipment on the vehicles, the pure electric vehicles often have the following problems in the working scene as above: 1. the starting power is insufficient, and a larger driving motor or a gearbox with more gears is usually equipped for normal starting; 2. when heavy load climbing is carried out and gear shifting is carried out, power interruption easily generates slope slipping risk; 3. when the operation hydraulic system works, an additional motor is required to be arranged for driving the hydraulic pump, and the system is complex and high in cost. The more typical vehicles are: mine/construction site heavy-duty dump trucks, high-power sanitation vehicles (washing and sweeping, water sprinkling, high-pressure cleaning, fog gun dust removal), concrete mixing transport vehicles, fire trucks and the like. To summarize, the demand characteristics for these vehicles or scenarios are:
1. a hydraulic system is required to participate in power distribution when hydraulic operation is required;
2. a low-speed operation mode (the running and the operation can coexist), low speed and frequent start and stop;
3. the method has the advantages that the peak driving torque compensation is needed when the vehicle starts or runs on a slope with great resistance, and the motor or the gearbox cannot be infinitely increased;
4. the power is not interrupted or is interrupted less, so that the drive failure is prevented;
5. the heavy-load starting is stable, and the anti-slope-slipping capability is strong;
6. motor and transmission size reduction, improvement load factor and efficiency, but drive capability can not be reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a dual-motor electro-hydraulic hybrid driving system which is high in system integration level, high in load rate and high in driving failure risk.
In order to achieve the purpose, the system of the double-motor electro-hydraulic hybrid drive comprises the following components:
the double-motor electro-hydraulic hybrid driving system is mainly characterized by comprising a first motor, a second motor, a planetary wheel mechanism, a gearbox input shaft, a hydraulic oil tank, a hydraulic oil pump clutch, an overflow valve, a one-way valve, an energy accumulator, an electromagnetic valve, a first clutch, a first brake, a second clutch, a gearbox input shaft hydraulic driving gear, a third clutch, a fourth clutch, a gearbox output shaft hydraulic driving gear, a driving control unit, a driving hydraulic motor, a gearbox output shaft coupling gear, a gearbox and a gearbox input shaft coupling gear,
the first motor is connected with a sun gear of the planetary gear mechanism through a clutch, the second motor is connected with a gear ring, and the planet carrier is connected with an input shaft of the gearbox; the hydraulic oil pump pass through the hydraulic oil pump clutch and be connected with first motor, the fluid input port of hydraulic oil pump is connected to hydraulic tank, the input of the delivery port department overflow valve of hydraulic oil pump is parallelly connected with the input of check valve, the energy storage ware of the delivery port department of check valve is parallelly connected with the input of solenoid valve, but the delivery outlet of two tee bend solenoid valves drives hydraulic oil pump or operation hydraulic pressure execution unit through the unilateral to two control mechanism exclusiveness bits and provides hydraulic power, wherein the pressure pulsation impact in the energy storage ware buffering hydraulic circuit, form gradual change controllable and steady hydraulic power output with hydraulic oil pump.
Preferably, the system is controlled according to the state of the third clutch and the fourth clutch, the power of the hydraulic motor is respectively coupled from the input shaft of the gearbox or the output shaft of the gearbox through two groups of coupling gears, and the two groups of clutches cannot be combined simultaneously in the driving process.
Preferably, the drive control unit realizes the control function of the drive motor, the clutch, the brake and the electromagnetic valve, and can be matched with a gearbox system or other systems of the vehicle to complete the logic control function of a power system.
Preferably, the system has three types of motor driving modes, and realizes the expansion of the high-efficiency power working area of the driving system through the strategy control of the driving control unit according to the working principle of the planetary gear train mechanism, so as to form 2 single motor driving modes and 1 double motor driving mode.
Preferably, the system has two hydraulic coupling modes, namely a driving hydraulic mode and a working hydraulic mode, by controlling the hydraulic oil pump and the solenoid valve, 2 hydraulic coupling modes are formed.
Preferably, the system has eight modes that hydraulic power participates in driving, and 8 modes that hydraulic power participates in driving are formed through state control and use working conditions of the double clutches, specifically: the system comprises a front-end motor linkage mode, a rear-end output linkage mode, a starting auxiliary mode, a gear shifting auxiliary mode, an anti-slope-slipping auxiliary mode, a parking mode, a limp mode and an isolation mode.
By adopting the dual-motor electro-hydraulic hybrid driving system, the comprehensive economic performance of the vehicle is improved; through hydraulic power coupling, the vehicle starting or passing capacity is improved, the stable starting capacity of the vehicle is improved, gear shifting power interruption is compensated, gear shifting feeling is optimized, and the hydraulic anti-slope-slipping capacity is increased; after the electro-hydraulic power is mixed, the capacity of a motor or a speed changer can be properly reduced, and the size and the cost of an electric power system are reduced; the two groups of motors have certain driving capability compensation, so that the complete failure risk of a driving system is reduced; the hydraulic system can convert the power of the motor and transmit the power to the output shaft end of the gearbox, so that the risk of complete failure of the drive after the failure of the speed change system is reduced, and a hydraulic crawling drive function can be executed; the vehicle hydraulic system is designed and controlled in an integrated mode, so that the vehicle hydraulic system is multifunctional, and the system integration level is improved.
Drawings
Fig. 1 is a dual-motor electro-hydraulic hybrid driving system of a dual-motor electro-hydraulic hybrid driving system and a control method thereof according to the present invention.
Reference numerals:
1, a hydraulic oil tank assembly;
2, a hydraulic oil pump;
3 hydraulic oil pump clutch;
4, an energy storage device;
5, an overflow valve;
6, a one-way valve;
7 a first motor;
8 a first clutch;
9 a first brake;
10 a planetary wheel mechanism;
11 a second brake;
12 a second motor;
13 a second clutch;
14 gearbox input shaft hydraulic drive gear;
15 a third clutch;
16 a fourth clutch;
17 hydraulic drive gear of gearbox output shaft;
18 a drive control unit;
19 an electromagnetic valve;
20 driving a hydraulic motor;
21 a gearbox output shaft coupling gear;
22 a gearbox;
the gearbox input shaft 23 couples the gears.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The invention relates to a dual-motor electro-hydraulic hybrid driving system which comprises a first motor, a second motor, a planetary wheel mechanism, a transmission input shaft, a hydraulic oil tank, a hydraulic oil pump clutch, an overflow valve, a one-way valve, an energy accumulator, an electromagnetic valve, a first clutch, a first brake, a second clutch, a transmission input shaft hydraulic driving gear, a third clutch, a fourth clutch, a transmission output shaft hydraulic driving gear, a driving control unit, a driving hydraulic motor, a transmission output shaft coupling gear, a transmission and a transmission input shaft coupling gear,
the first motor is connected with a sun gear of the planetary gear mechanism through a clutch, the second motor is connected with a gear ring, and the planet carrier is connected with an input shaft of the gearbox; the hydraulic oil pump pass through the hydraulic oil pump clutch and be connected with first motor, the fluid input port of hydraulic oil pump is connected to hydraulic tank, the input of the delivery port department overflow valve of hydraulic oil pump is parallelly connected with the input of check valve, the energy storage ware of the delivery port department of check valve is parallelly connected with the input of solenoid valve, but the delivery outlet of two tee bend solenoid valves drives hydraulic oil pump or operation hydraulic pressure execution unit through the unilateral to two control mechanism exclusiveness bits and provides hydraulic power, wherein the pressure pulsation impact in the energy storage ware buffering hydraulic circuit, form gradual change controllable and steady hydraulic power output with hydraulic oil pump.
In a preferred embodiment of the present invention, the system is configured to couple the power of the hydraulic motor from the input shaft of the transmission or the output shaft of the transmission through two sets of coupling gears according to the state control of the third clutch and the fourth clutch, and the two sets of clutches cannot be simultaneously combined during driving.
As a preferred embodiment of the invention, the drive control unit realizes the control function of the drive motor, the clutch, the brake and the electromagnetic valve, and can be matched with a gearbox system or other systems of the vehicle to complete the logic control function of a power system.
As a preferred embodiment of the invention, the system has three types of motor driving modes, and the high-efficiency power working area of the driving system is expanded by the strategy control of the driving control unit according to the working principle of the planetary gear train mechanism, so that 2 single-motor driving modes and 1 double-motor driving mode are formed.
As a preferred embodiment of the invention, the system has two hydraulic coupling modes, namely a driving hydraulic mode and a working hydraulic mode, by controlling the hydraulic oil pump and the solenoid valve, 2 hydraulic coupling modes are formed.
As a preferred embodiment of the present invention, the system has eight modes in which hydraulic power participates in driving, and forms 8 modes in which hydraulic power participates in driving through state control and use conditions of the double clutches, specifically: the system comprises a front-end motor linkage mode, a rear-end output linkage mode, a starting auxiliary mode, a gear shifting auxiliary mode, an anti-slope-slipping auxiliary mode, a parking mode, a limping mode and an isolation mode.
In a specific embodiment of the present invention, the present invention provides a dual-motor electro-hydraulic hybrid driving system and a control method thereof, including: the hydraulic control system comprises a hydraulic oil tank assembly, a hydraulic oil pump clutch, an energy accumulator, an overflow valve, a one-way valve, a first motor, a first clutch, a first brake, a planetary wheel mechanism, a second brake, a second motor, a second clutch, a gearbox input shaft hydraulic drive gear, a third clutch, a fourth clutch, a gearbox output shaft hydraulic drive gear, a drive control unit, an electromagnetic valve, a drive hydraulic motor, a gearbox output shaft coupling gear, a gearbox and a gearbox input shaft coupling gear.
The hydraulic oil tank assembly comprises the functions of heat dissipation, filtration, liquid storage, liquid supplementation and the like, provides hydraulic oil for the hydraulic oil pump, and provides a return channel for the hydraulic motor and the overflow valve.
The hydraulic oil pump is a hydraulic power source of the vehicle and is used for providing stable hydraulic power. The input port is from a hydraulic tank.
The hydraulic oil pump clutch may be referred to as C0 hereinafter. The combination or separation function can be realized through the control unit, so that the first motor is connected with the hydraulic oil pump and then transmits power or is disconnected after separation.
The energy accumulator mainly plays a role in buffering and absorbing pressure pulsation. The pressure stabilizing function is provided for a pipeline communicated with the No. 3 input port of the electromagnetic valve by being communicated in front of the No. 3 input port of the electromagnetic valve and being positioned behind the outlet of the one-way valve.
The overflow valve and the pipeline pressure protection or limit value maintaining valve are used, and the hydraulic oil is decompressed and flows back to the oil tank after exceeding the pressure limit value. The overflow valve is connected in parallel with the output port of the hydraulic oil pump, and the other end of the overflow valve is communicated with the hydraulic oil tank.
The check valve prevents the reverse backflow or reverse pressure transmission of the hydraulic oil. The inlet is connected to the hydraulic oil pump and the direction of the liquid flow is opposite to the outlet of the hydraulic oil pump.
The first electric machine may be referred to as EM1 hereinafter. The planetary gear mechanism has two functions of an electric motor and a regenerative braking generator, and a rotor part of the planetary gear mechanism is connected with a sun gear of the planetary gear mechanism through a first clutch.
The first clutch, hereinafter may be referred to as C1. The combination or separation function can be realized through the control unit, so that the EM1 motor is connected with the sun gear of the planetary gear mechanism to transmit power or is separated to disconnect power.
The first brake may be referred to as B1. The unlocking and locking functions can be realized through the control unit, so that the free rotation and the stalling brake of the sun gear of the planetary gear mechanism are realized.
The planetary gear mechanism is a standard planetary gear transmission mechanism and comprises a sun gear, a planet gear, a gear ring and a planet carrier. The second brake, hereinafter, may be referred to as B2. The unlocking and locking functions can be realized through the control unit, so that the free rotation and the stalling brake of the gear ring of the planetary gear mechanism are realized. The second electric machine may be abbreviated as EM2 hereinafter. The planetary gear mechanism has two functions of a motor and a regenerative braking generator, and a rotor part of the planetary gear mechanism is connected with a gear ring of the planetary gear mechanism.
The second clutch, hereinafter may be referred to as C2. The combination or separation function can be realized through the control unit, so that the EM2 motor rotor is connected with a planet carrier of the planetary gear mechanism to transmit power or is disconnected after separation. When the clutch is combined, the planet carrier of the planetary gear mechanism is connected with the gear ring of the planetary gear mechanism through the EM2 motor rotor, and as a result, the sun gear, the planet carrier and the gear ring of the whole planetary gear mechanism have the same rotating speed, and the torque among the sun gear, the planet carrier and the gear ring forms a coupling relation. The gearbox input shaft hydraulically drives the gear for transmitting power from the drive hydraulic motor.
The third clutch may be referred to as C3 hereinafter. The combination or separation function can be realized through the control unit, so that the hydraulic drive power can be obtained after the hydraulic drive motor is connected with the hydraulic drive gear of the input shaft of the gearbox or the power can be disconnected after the hydraulic drive motor is separated from the hydraulic drive gear of the input shaft of the gearbox.
The fourth clutch may be referred to as C4 hereinafter. The combination or separation function can be realized through the control unit, so that the hydraulic drive power can be obtained after the hydraulic drive motor is connected with the hydraulic drive gear of the output shaft of the gearbox or the power can be disconnected after separation. The gearbox output shaft hydraulically drives a gear for transmitting power from a drive hydraulic motor, the Drive Control Unit (DCU).
Hereinafter, may be abbreviated as DCU. The master control system of the driving system can control the motor set, the brake set, the clutch set and the electromagnetic valve, and has the functions of communication and coordination control with the gearbox system and other vehicle control systems. The device can be a single function integration assembly, and can also be decomposed into sub-control units of all parts, and the functions are decomposed. The DCU has electrical connection and control relation with each motor, each brake, each clutch, the electromagnetic valve and the gearbox, namely, the function of electrical signal or power current intercommunication. The electromagnetic valve and the two-position three-way valve can realize the selection of the output direction of the input hydraulic power.
The ports 1 and 2 of the electromagnetic valve are used as hydraulic power output ports, and the port 3 is used as a hydraulic power input port. The solenoid valve has 2 kinds of connected states: the input port 3 is communicated with the output port No. 1, and the port No. 2 is closed; the input port 3 is communicated with the output port No. 2, and the port No. 1 is closed.
The hydraulic power of the No. 3 input port comes from the hydraulic oil pump through the check valve, the No. 1 output port is connected to the driving hydraulic motor, and the No. 2 output port is connected to other hydraulic execution units on the vehicle. The driving hydraulic motor outputs hydraulic power to drive a load. The motor hydraulic input pipeline is connected with the No. 1 output port of the electromagnetic valve, and the motor hydraulic output pipeline is communicated with the oil tank.
And the output shaft of the gearbox is coupled with a gear and used for coupling power from a driving hydraulic motor. The gearbox, a variable speed transmission mechanism of a vehicle, can provide power transmission or neutral gear interrupting power functions. The gearbox input shaft is coupled with a gear and is used for coupling power from a driving hydraulic motor.
The mechanical coupling relation and the power splitting principle of the planetary gear train are utilized, the clutch and the brake are combined at the same time, two groups of driving motors are adopted, and the working states of the two groups of motors are dynamically adjusted, so that the effect of greatly expanding the high-efficiency working area of the driving system under different power requirements is achieved. Meanwhile, when the torque and power required by the vehicle are small, the EM1 motor can be separated to drive the oil pump independently to drive the operation execution unit to work, and the operation requirement during low-power driving or parking is met. Moreover, through the hydraulic coupling loop, the power of the EM1 motor is amplified through the hydraulic oil pump and then transmitted to the driving system, the function of power superposition is realized, the backup power at low speed is greatly improved, and the hydraulic coupling loop can be used for power interruption compensation, slope slipping prevention, low-speed stable starting and other functions. And finally, the driving control unit is utilized to carry out logic control on the driving motor, the brake, the clutch, the electromagnetic valve and the like so as to achieve the control and coordination of system components and the performance realization of the whole system.
Fig. 1 shows a dual-motor electro-hydraulic hybrid driving system and a control method thereof according to an embodiment of the invention.
By utilizing the rotating speed constraint relation and the torque constraint relation of the planetary gear train and controlling the power control unit, 3 types (6 types) of motor driving modes can be formed:
1. mode 1: single motor driving mode-EM 1 motor driven 2 states
The hydraulic oil pump clutch is separated, the first clutch is combined, the first brake is unlocked, the second brake is locked, and the second clutch is separated; the movement and the moment between the EM1 motor and the planet carrier form a coupling relation, and the EM1 motor is input to the gearbox to execute the driving function of the whole vehicle after speed change.
The hydraulic oil pump clutch is separated, the first clutch is combined, the first brake is unlocked, the second brake is unlocked, and the second clutch is combined; the planetary wheel mechanism loses the original function, directly transmits the rotating speed and the torque, and is directly input to the gearbox by the EM1 motor to execute the driving function of the whole vehicle.
2. Mode 2: single motor driving mode-EM 2 motor driven 2 states
The first brake is locked, the second brake is unlocked, and the second clutch is separated; the movement and the moment between the EM2 motor and the planet carrier form a coupling relation, and the EM2 motor is input to the gearbox to execute the whole vehicle driving function after speed change.
The first clutch is separated, the first brake is unlocked, the second brake is unlocked, and the second clutch is combined; the planetary wheel mechanism loses the original function, directly transmits the rotating speed and the torque, and is directly input to the gearbox by the EM2 motor to execute the driving function of the whole vehicle.
3. Mode 3: dual-motor driving mode-2 states of combined driving of EM1 and EM2 motors
The hydraulic oil pump clutch is separated, the first clutch is combined, the first brake is unlocked, the second brake is unlocked, and the second clutch is separated; the movement and the torque among the EM1 motor, the EM2 motor and the planet carrier form a coupling relation, and the EM1 motor and the EM2 motor are input to the gearbox to perform the driving function of the whole vehicle after passing through the coupling relation.
The hydraulic oil pump clutch is separated, the first clutch is combined, the first brake is unlocked, the second brake is unlocked, and the second clutch is combined; the planetary wheel mechanism loses the original function, directly transmits the rotating speed and the torque, and directly performs torque superposition by the EM1 motor and the EM2 motor, and then inputs the torque to the gearbox to execute the driving function of the whole vehicle.
By controlling the control position of the solenoid valve, 2 hydraulic coupling modes can be realized: when the hydraulic oil pump provides hydraulic power, the hydraulic oil pump clutch combines, is provided power by first motor:
1. mode 1: and in a driving hydraulic mode, the control electromagnetic valve is internally communicated with No. 1 and No. 3 interfaces, a hydraulic oil pump can provide hydraulic power for driving a hydraulic motor, and a working hydraulic unit is not connected with the hydraulic power.
2. Mode 2: in the working hydraulic mode, the control electromagnetic valve is internally communicated with No. 2 and No. 3 interfaces, the hydraulic oil pump can provide hydraulic power for the working hydraulic unit, and the driving hydraulic motor is not connected with the hydraulic power.
Through hydraulic drive function intervention and vehicle usage, 8 hydraulic power participation driving modes can be formed:
1. mode 1: front end motor linkage mode-the third clutch is engaged, the fourth clutch is disengaged; the driving hydraulic motor and the EM2 motor form torque coupling, and form vehicle driving torque together to drive the vehicle to run after passing through the gearbox, wherein the driving hydraulic motor mainly plays a role in low-speed backup power of the vehicle, and also plays a role in suppression and compensation of torque peak of the EM2 motor.
2. Mode 2: rear output linkage mode-the third clutch is disengaged and the fourth clutch is engaged; the driving hydraulic motor forms torque coupling with an output shaft of the gearbox, namely the driving hydraulic motor and the EM2 motor are coupled through torque passing through the gearbox to drive the vehicle to run together, and the driving hydraulic motor can play a role in medium/high-speed backup power of the vehicle.
3. Mode 3: in the starting auxiliary mode, the rotating speed of the hydraulic oil pump is controlled to form a very stable and smoothly-changed hydraulic driving force at the position of the driving hydraulic motor, so that the vehicle is started stably and comfortably. Meanwhile, the hydraulic motor can be jointly started with the EM2 motor to form a strong static starting torque, the starting assistance effect under extreme road conditions is achieved, and the driving hydraulic motor is free of locked rotor failure risk.
4. Mode 4: in the shift auxiliary mode, the AMT transmission can form power interruption during shifting, a transmission shaft can be completely unloaded, and in the process from power disconnection to power return, actions such as transmission clearance, transmission system elasticity, power loading and unloading mutation, synchronous combination and the like can cause large shift impact on the transmission system. The hydraulic motor is used for driving the coupling gear at the rear end of the gearbox to work, torque interruption compensation in the gear shifting process is participated, gear shifting impact strength can be reduced, and gear shifting feeling is optimized.
5. Mode 5: the anti-slope-sliding auxiliary mode is divided into two conditions of starting anti-slope-sliding and gear-shifting anti-slope-sliding. When the hydraulic motor is started statically, the hydraulic motor is driven to have larger static starting torque and the characteristic of being not afraid of locked-rotor, so that the hydraulic motor and the motor can better realize the functions of starting and slope slipping prevention. When the heavy-duty vehicle climbs a slope at a low speed, the power interruption is very dangerous, and at the moment, the power of the driving hydraulic motor can directly act on the coupling gear at the rear end of the gearbox, so that the power output is compensated to a greater extent, and the function of shifting and preventing the vehicle from sliding down the slope is formed.
6. Mode 6: in the parking mode, the third clutch and the fourth clutch are combined simultaneously, and the transmission system movement interference can be formed through the gearbox, so that the effect of parking the transmission system is achieved.
7. Mode 7: limp home mode-when a certain motor of the vehicle loses power or the transmission system fails, the power for driving the hydraulic motor can be connected into the transmission system through the clutch, and low-speed driving crawling is realized.
8. Mode 8: in the isolation mode, the third clutch and the fourth clutch are simultaneously separated, and the driving hydraulic motor is isolated from the transmission system and does not participate in the transmission of the rotating speed and the torque.
By adopting the dual-motor electro-hydraulic hybrid driving system, the comprehensive economic performance of the vehicle is improved; through hydraulic power coupling, the vehicle starting or passing capacity is improved, the stable starting capacity of the vehicle is improved, gear shifting power interruption is compensated, gear shifting feeling is optimized, and the hydraulic anti-slope-slipping capacity is increased; after the electro-hydraulic power is mixed, the capacity of a motor or a speed changer can be properly reduced, and the size and the cost of an electric power system are reduced; the two groups of motors have certain driving capability compensation, so that the complete failure risk of a driving system is reduced; the hydraulic system can convert the power of the motor and transmit the power to the output shaft end of the gearbox, so that the risk of complete failure of the drive after the failure of the speed change system is reduced, and a hydraulic crawling drive function can be executed; the vehicle hydraulic system is designed and controlled in an integrated mode, so that the vehicle hydraulic system is multifunctional, and the system integration level is improved.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (6)
1. A dual-motor electro-hydraulic hybrid driving system is characterized by comprising a first motor, a second motor, a planetary wheel mechanism, a gearbox input shaft, a hydraulic oil tank, a hydraulic oil pump clutch, an overflow valve, a one-way valve, an energy accumulator, an electromagnetic valve, a first clutch, a first brake, a second clutch, a gearbox input shaft hydraulic drive gear, a third clutch, a fourth clutch, a gearbox output shaft hydraulic drive gear, a drive control unit, a drive hydraulic motor, a gearbox output shaft coupling gear, a gearbox and a gearbox input shaft coupling gear,
the first motor is connected with a sun gear of the planetary gear mechanism through a clutch, the second motor is connected with a gear ring, and the planet carrier is connected with an input shaft of the gearbox; the hydraulic oil pump is connected with the first motor through a hydraulic oil pump clutch, an oil input port of the hydraulic oil pump is connected to the hydraulic oil tank, an input end of an overflow valve at an output port of the hydraulic oil pump is connected with an input end of a one-way valve in parallel, an energy accumulator at the output port of the one-way valve is connected with an input port of an electromagnetic valve in parallel, an output port of the two-position three-way electromagnetic valve can drive the hydraulic oil pump or an operation hydraulic execution unit to provide hydraulic power in an exclusive mode through a one-way two-position control mechanism, wherein the energy accumulator buffers pressure pulsation impact in a hydraulic loop and forms gradual change controllable and stable hydraulic power output with the hydraulic oil pump.
2. The dual-motor electro-hydraulic hybrid driving system as claimed in claim 1, wherein the system is controlled according to the states of the third clutch and the fourth clutch, the power of the hydraulic motor is coupled from the input shaft of the gearbox or the output shaft of the gearbox through two groups of coupling gears, and the two groups of clutches cannot be combined simultaneously in the driving process.
3. The dual-motor electro-hydraulic hybrid driving system as claimed in claim 1, wherein the driving control unit implements control functions of the driving motor, the clutch, the brake and the solenoid valve, and can cooperate with a transmission system or other systems of the vehicle to implement logic control functions of a power system.
4. The dual-motor electro-hydraulic hybrid driving system according to claim 1, wherein the system has three types of motor driving modes, and the expansion of the high-efficiency power working area of the driving system is realized through the strategy control of the driving control unit according to the working principle of a planetary gear train mechanism, so that 2 types of single-motor driving modes and 1 type of dual-motor driving modes are formed.
5. The dual-motor electro-hydraulic hybrid driving system according to claim 1, wherein the system has two hydraulic coupling modes, namely a driving hydraulic mode and a working hydraulic mode, by controlling the hydraulic oil pump and the solenoid valve.
6. The dual-motor electro-hydraulic hybrid driving system as claimed in claim 1, wherein the system has eight modes in which hydraulic power participates in driving, and forms 8 modes in which hydraulic power participates in driving through state control and use conditions of a dual clutch, specifically: the system comprises a front-end motor linkage mode, a rear-end output linkage mode, a starting auxiliary mode, a gear shifting auxiliary mode, an anti-slope-slipping auxiliary mode, a parking mode, a limping mode and an isolation mode.
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| JP2001200920A (en) * | 2000-01-17 | 2001-07-27 | Honda Motor Co Ltd | Control device for hybrid vehicle |
| CN104442371A (en) * | 2014-12-02 | 2015-03-25 | 吉林大学 | Power transmission system of power split hydraulic hybrid loader |
| CN104763804A (en) * | 2015-04-22 | 2015-07-08 | 福建工程学院 | Centralized drive type pure electric vehicle power system |
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| CN106965671A (en) * | 2016-10-27 | 2017-07-21 | 蔚来汽车有限公司 | Pure electric automobile is with two shift transmission power assemblies |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200920A (en) * | 2000-01-17 | 2001-07-27 | Honda Motor Co Ltd | Control device for hybrid vehicle |
| CN104442371A (en) * | 2014-12-02 | 2015-03-25 | 吉林大学 | Power transmission system of power split hydraulic hybrid loader |
| CN104763804A (en) * | 2015-04-22 | 2015-07-08 | 福建工程学院 | Centralized drive type pure electric vehicle power system |
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