CN112265439A - Electric drive system and method based on planet wheel and vehicle - Google Patents
Electric drive system and method based on planet wheel and vehicle Download PDFInfo
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- CN112265439A CN112265439A CN202011132865.5A CN202011132865A CN112265439A CN 112265439 A CN112265439 A CN 112265439A CN 202011132865 A CN202011132865 A CN 202011132865A CN 112265439 A CN112265439 A CN 112265439A
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- locking mechanism
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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
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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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- 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
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
- B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
- B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
- B60T1/062—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels acting on transmission parts
Abstract
The embodiment of the specification discloses a planet wheel-based electric drive system, a method and a vehicle, wherein the planet wheel-based electric drive system comprises: driving motor, the planet wheel transmission who contains sun gear, planet wheel, planet carrier and ring gear, decelerator and the semi-axis that connect gradually along power transmission route to and locking mechanical system, wherein: the transmission shaft of the driving motor is connected with the sun gear; the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through the half shaft; when the locking mechanism is at the first position, the locking mechanism and the gear ring are in a disengaged state, and the gear ring is in a follow-up state with the planet gear, so that no-load loss generated by the driving motor is reduced, and the safety of the electric driving system is improved.
Description
Technical Field
The specification relates to the technical field of computers, in particular to an electric drive system and method based on planet wheels and a vehicle.
Background
With the increasing popularity of electric vehicles, the safety requirements of the automobile industry on electric drive systems are increasing, and electric drive systems with separating mechanisms are coming.
For example, an electric drive system of a permanent magnet synchronous motor (i.e., an electric drive system with a release mechanism) may be used as the electric drive system of an electric vehicle. However, in the electric drive system with the permanent magnet synchronous motor, the motor and the wheels cannot be separated, and the permanent magnet synchronous motor also has drag torque and no-load back electromotive force, so that the permanent magnet synchronous motor generates brake torque and back electromotive force when the vehicle slides, so that the energy consumption of the whole electric vehicle is increased, and meanwhile, the permanent magnet synchronous motor has high rotating speed and high back electromotive force, and risks of breaking down a controller and harming the whole vehicle and personnel safety are also caused, so that the safety of the electric drive system is poor.
Disclosure of Invention
An object of an embodiment of the present description is to provide an electric drive system based on a planet wheel, a method and a vehicle, so as to solve the problem that the safety of the electric drive system is poor in the prior art.
In order to solve the above technical problem, the embodiments of the present specification are implemented as follows:
in a first aspect, embodiments of the present disclosure provide a planetary-based electric drive system, which includes: the driving mechanism comprises a driving motor, a planet gear transmission device, a speed reducing device, a half shaft and a locking mechanism, wherein the planet gear transmission device comprises a sun gear, a planet carrier and a gear ring;
the transmission shaft of the driving motor is connected with the sun gear;
the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through the half shaft;
when the locking mechanism is at the first position, the locking mechanism is in a disengagement state with the gear ring, and the gear ring is in a follow-up state with the planet gear.
In a second aspect, embodiments of the present specification provide a planetary-wheel-based electrically-driven vehicle comprising the planetary-wheel-based electrically-driven system of the first aspect.
In a third aspect, the present specification provides a method for electrically driving a vehicle based on a planetary gear, the method being applied to the electrically driven vehicle based on a planetary gear according to the second aspect, and the method including:
receiving a release instruction for the locking mechanism;
controlling the locking mechanism to be in a first position, enabling the locking mechanism to be in a disengagement state with the gear ring, and enabling the gear ring to be in a follow-up state with the planet gear;
acquiring a first rotating speed of the driving motor, wherein the first rotating speed is a speed absolute value without direction;
and if the first rotating speed is greater than a preset first target rotating speed, controlling the driving motor to execute a preset first speed control mode so as to reduce the rotating speed of the driving motor and enable a no-load loss value generated by the driving motor to be smaller than a preset no-load loss value.
In a fourth aspect, embodiments of the present specification provide a storage medium. Suitable for use in a vehicle comprising a planetary-based electrically-driven vehicle as described in the second aspect, the storage medium being adapted to store computer-executable instructions. The computer executable instructions, when executed, implement the following process:
receiving a release instruction for the locking mechanism;
controlling the locking mechanism to be in a first position, enabling the locking mechanism to be in a disengagement state with the gear ring, and enabling the gear ring to be in a follow-up state with the planet gear;
acquiring a first rotating speed of the driving motor, wherein the first rotating speed is a speed absolute value without direction;
and if the first rotating speed is greater than a preset first target rotating speed, controlling the driving motor to execute a preset first speed control mode so as to reduce the rotating speed of the driving motor and enable a no-load loss value generated by the driving motor to be smaller than a preset no-load loss value.
As can be seen from the technical solutions provided in the embodiments of the present specification, the embodiments of the present specification provide an electric drive system, a method and a vehicle based on a planetary gear, where the electric drive system based on a planetary gear includes: the driving mechanism comprises a driving motor, a planet gear transmission device, a speed reducing device, a half shaft and a locking mechanism, wherein the planet gear transmission device comprises a sun gear, a planet carrier and a gear ring; a transmission shaft of the driving motor is connected with the sun gear; the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through a half shaft; when the locking mechanism is at the first position, the locking mechanism and the gear ring are in a disengaged state, and the gear ring is in a follow-up state with the planet gear. Therefore, the driving motor and the transmission system can be not completely separated physically, the function of realizing power decoupling of the driving motor can be realized, no-load loss generated by the driving motor is reduced even if the gear ring is in a follow-up state with the planet wheel, and meanwhile, the danger of high-pressure exposure of the electric driving system can be reduced to the maximum extent, and the safety of the electric driving system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a first schematic structural diagram of a planetary-wheel-based electric drive system provided in an embodiment of the present disclosure;
fig. 2 is a structural schematic diagram two of an electric drive system based on a planet wheel provided in the embodiment of the present disclosure;
fig. 3 is a first schematic flow chart of a planetary-wheel-based electric drive system provided in an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of a second electrical drive system based on a planetary gear according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the specification provides an electric driving method and device based on a planet wheel and electronic equipment.
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present specification, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any inventive step should fall within the scope of protection of the present specification.
Fig. 1 is a schematic structural diagram of a planetary-wheel-based electric drive system provided in an embodiment of the present disclosure, where the planetary-wheel-based electric drive system includes: the device comprises a driving motor 1, a planetary gear transmission device comprising a sun gear 2, a planetary gear 3, a planetary carrier 5 and a gear ring 4, a speed reducer 6, a half shaft 7 and a locking mechanism 9 which are sequentially connected along a power transmission path; wherein the content of the first and second substances,
a transmission shaft of the driving motor 1 is connected with the sun gear 2;
the planet carrier 5 is connected with a driving gear of a speed reducing device 6, and the speed reducing device 6 is connected with wheels 8 through a half shaft 7;
when the locking mechanism 9 is in the first position, the locking mechanism 9 is in a disengaged state with the ring gear 4, and the ring gear 4 is in a follow-up state with the planet gears 3.
The locking mechanism 9 may be embodied as a brake.
Specifically, a plurality of planet wheels 3 can be included in the planet wheel transmission device, the planet wheels 3 can be uniformly distributed between the sun wheel 2 and the ring gear 4 and respectively meshed with the sun wheel 2 and the ring gear 4, and the planet wheels 3 can also be arranged on the planet carrier 5. The number of the planet wheels 3 can be determined according to the requirement of the driving motor 1, the number of the planet wheels 3 can also be determined according to the size of the planet wheel transmission device and the size of the sun wheel 2, the determination method of the number of the planet wheels 3 can be various, and the determination method can be different according to different practical application scenes, and the number of the planet wheels 3 is not specifically limited in the embodiment of the specification.
The drive motor 1 can be connected to the sun gear 2, i.e. the sun gear 2 can be fixedly connected to the drive shaft of the drive motor 1.
The planet carrier 5 may be connected to a reduction gear 6, which reduction gear 6 may be connected to wheels 8 via half shafts 7. I.e. the planet carrier 5 may be fixedly connected to the output shaft of the reduction gear 6.
The locking mechanism 9 may be disposed at a position capable of acting on the ring gear 4, and configured to perform, when receiving a release instruction, a release operation of the locking mechanism 9 from the ring gear 4 (even if the locking mechanism 9 is located at a first position where the locking mechanism cannot act on the ring gear 4), so that the locking mechanism 9 is in a release state from the ring gear 4, and the ring gear 4 is in a following state with the planet gears 3, thereby reducing a no-load loss generated by the driving motor 1. The no-load loss may include bearing loss of a driving motor, wind friction loss, magnetic hysteresis and eddy current loss caused by a permanent magnet rotor.
When the locking mechanism 9 performs the disengagement operation of the locking mechanism 9 and the gear ring 4, that is, the locking mechanism 9 is located at the first position, the driving motor 1 can be physically separated from the transmission system incompletely, the function of power decoupling can be realized, that is, the loss of the driving motor 1 can be avoided, and meanwhile, the driving motor 1 can be prevented from generating an excessively high back electromotive force.
For example, when the vehicle is in a coasting state, the locking mechanism 9 may perform a disengagement operation of the locking mechanism 9 from the ring gear 4, that is, the locking mechanism 9 is separated from the ring gear 4, at this time, the planetary gear transmission is in an idle state, the power of the planet carrier 5 cannot be transmitted to the sun gear 2, and the driving wheels of the driving motor 1 cannot effectively rotate, so that no-load loss of the driving motor 1 is eliminated.
In a specific embodiment, as shown in fig. 2, when the locking mechanism 9 is in the second position, the locking mechanism 9 and the ring gear 4 are in a locked state, that is, when a locking command is received, the locking mechanism 9 can be controlled to be in the second position to perform a locking operation on the ring gear 4, so that the power output by the driving motor 1 is transmitted from the planetary gear transmission to the speed reduction device 6 and then transmitted to the wheels 8 through the speed reduction device 6 and the half shafts 7 in sequence. By the locking operation of the locking mechanism 9, the control efficiency of the planetary-wheel-based electric drive system can be improved.
For example, when the vehicle is in a driving state or a capacity recovery state, the locking mechanism 9 may perform a locking operation on the ring gear 4 upon receiving a locking command, the sun gear 2 and the ring gear 4 are connected together, and the planetary gear transmission as a whole transmits the power of the carrier 5 (i.e., the power output by the driving motor 1) to the reduction gear 6, and then the reduction gear 6 transmits the power to the wheels 8.
The system gear ratio during the above power transmission may be
Where i is the system gear ratio, i25For the gear ratio of the planetary gear transmission, i0Is a main reduction ratio, z4Number of teeth, z, of ring gear 42Number of teeth of sun gear 2, z6The number of teeth, z, of the final drive 6017The number of teeth of the driving deceleration driven gear.
The reduction device 6 may comprise a final drive 601 and a differential 602, the final drive 601 may be connected with the planet carrier 5, the differential 602 may be connected with the half-shafts 7, and the half-shafts 7 may be connected with the wheels 8.
The embodiment of the specification provides a planet wheel-based electric drive system, a method and a vehicle, wherein the planet wheel-based electric drive system comprises: the driving mechanism comprises a driving motor, a planet gear transmission device, a speed reducing device, a half shaft and a locking mechanism, wherein the planet gear transmission device comprises a sun gear, a planet carrier and a gear ring; a transmission shaft of the driving motor is connected with the sun gear; the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through a half shaft; when the locking mechanism is at the first position, the locking mechanism and the gear ring are in a disengaged state, and the gear ring is in a follow-up state with the planet gear. Therefore, the driving motor and the transmission system can be not completely separated physically, the function of realizing power decoupling of the driving motor can be realized, no-load loss generated by the driving motor is reduced even if the gear ring is in a follow-up state with the planet wheel, and meanwhile, the danger of high-pressure exposure of the electric driving system can be reduced to the maximum extent, and the safety of the electric driving system is improved.
On the basis of the electric drive system provided by the above embodiment, an embodiment of the present specification provides a planet-based electric drive method, which is applied to a vehicle including the above planet-based electric drive system, as shown in fig. 3, and the method includes:
in S102, a release command for the lock mechanism 9 is received.
Specifically, for example, when the electrically driven vehicle based on the planetary gear is in a coasting state, a release instruction for the lock mechanism 9 may be received.
After receiving the release instruction for the locking mechanism 9, validity determination may be made on the release instruction, for example, validity determination may be made on the release instruction according to the speed state of the electrically driven vehicle based on the planetary wheels, whether there is a torque output demand of the drive motor 1, and if the release instruction is valid, S104 may be continuously executed.
The method for judging the effectiveness of the release instruction may be various, and may be different according to different actual application scenarios, and this is not specifically limited in the embodiment of the present specification.
In S104, the locking mechanism 9 is controlled to be in the first position, the locking mechanism 9 is in a disengaged state with the ring gear 4, and the ring gear 4 is in a follow-up state with the planetary gear.
The first position may be any position where the locking mechanism 9 cannot lock the ring gear 4.
In S106, a first rotation speed of the drive motor 1 is acquired.
The first rotation speed may be an absolute value of speed without direction.
Specifically, after the locking mechanism 9 performs the disengagement operation, the ring gear 4 starts to rotate due to the action of the planet gears 3, while the driving motor 1 still has a certain rotation speed due to its own inertia and the action given by the drive train. A first rotational speed of the drive motor 1 can be obtained.
In S108, if the first rotation speed is greater than the preset first target rotation speed, the driving motor 1 is controlled to execute a preset first speed control mode to reduce the rotation speed of the driving motor 1 so that the no-load loss value generated by the driving motor 1 is less than the preset no-load loss value.
Specifically, if the first rotational speed of the drive motor 1 is greater than a preset first target rotational speed (e.g., 50rpm), and a failure notification of the planetary-wheel-based electric drive system is not received, the drive motor 1 is controlled to execute a preset first speed control mode so that the drive motor 1 generates an appropriate torque, preventing the drive motor 1 from running to an excessively high rotational speed to generate a redundant control loss.
In addition, the first speed control mode may be various, and may be different according to different practical application scenarios, and this is not particularly limited in this embodiment of the present specification.
In addition, if a failure notification of the planet-wheel based electric drive system is received, i.e. the planet-wheel based electric drive system fails, the failure handling mode may be entered.
Further, as shown in fig. 4, after step S106 is executed, steps S112 to S122 may also be executed:
in S112, a no-load loss value corresponding to the first rotation speed is acquired.
Specifically, in practical applications, the processing manner of S112 may be various, and an alternative implementation manner is provided below, which may specifically refer to the following processing from step one to step three:
step one, determining a first torque applied to the driving motor 1 based on the number of teeth of the sun gear 2, the number of teeth of the ring gear 4 and the inherent rolling friction force of a ring gear bearing.
In particular, the number of teeth of the sun gear 2, the number of teeth of the ring gear 4 and the inherent rolling friction of the ring gear 4 bearing may be substituted into the formula in a steady state of constant speed of the planet-based electric drive system
A first torque is obtained to which the drive motor 1 is subjected (equal to the inherent rolling friction of the sun wheel 2 from the bearing), wherein,
first torque z to which the drive motor 1 is subjected2Number of teeth of sun gear 2, z4The number of teeth of the ring gear 4,
is the inherent rolling friction of the ring gear 4 bearing.
And secondly, determining the first torque as the dragging torque if the first rotating speed is greater than a preset first target rotating speed.
Specifically, when the first torque applied to the driving motor 1 is not greater than the inherent starting torque of the driving motor 1 (which is synthesized by the cogging torque of the driving motor 1, the inherent rolling friction of the motor bearing, and the like), the rotation speed of the driving motor 1 is zero.
When the dragging torque borne by the driving motor 1 is greater than the inherent starting torque of the driving motor 1, the driving motor 1 will rotate until the first rotating speed is greater than the preset first target rotating speed, at this time, the dragging torque of the driving motor 1 may be equal to the first torque, that is, if the first rotating speed is greater than the preset first target rotating speed, the first torque is determined as the dragging torque.
And step three, determining a no-load loss value based on the dragging torque and the first rotating speed.
The drag torque and the first rotational speed may be substituted into a formula
Obtaining the no-load loss value of the driving motor 1, wherein PLOSSAt the idle loss value, SPEED is the first SPEED,
in order to drive the drag torque experienced by the motor 1.
In S114, if the no-load loss value is not less than the preset no-load loss threshold value, the drive motor is controlled to execute a preset first speed control mode.
The preset first speed control mode may include one or more of a preset speed regulation control mode, a preset deceleration control mode and an Active Short Circuit (ASC) control mode, and the preset no-load loss threshold may be determined based on a preset first target rotation speed and a drag torque applied to the driving motor 1.
Specifically, the driving motor 1 is controlled to execute the preset first speed control mode, which may be that the driving motor 1 is in a stationary state or the first rotation speed of the driving motor 1 is smaller than the preset first target rotation speed, so that the no-load loss value generated by the driving motor 1 is smaller than the preset no-load loss threshold, and the optimization of the energy consumption of the whole vehicle is realized.
In S116, a lock instruction for the lock mechanism 9 is received.
Specifically, for example, when the vehicle is in a driving state or a capacity recovery state, a lock instruction for the lock mechanism 9 may be received. In addition, after receiving the locking instruction, validity judgment may also be performed on the locking instruction, and the method for judging validity may refer to the validity judgment method in the fourth S102 in the above embodiment, which is not described herein again.
In S118, the second rotation speed of the ring gear is acquired.
The second rotation speed may be an absolute speed value that does not include a direction.
In S120, if the second rotation speed is greater than the preset second target rotation speed, the driving motor 1 is controlled to execute a preset second speed control mode to change the rotation speed of the driving motor 1 and to reduce the second rotation speed of the ring gear 4 under the coupling action of the planetary gears 3.
Wherein the preset second speed control mode may include one or more of a preset speed regulation control mode and a preset acceleration control mode.
Specifically, if the second rotation speed of the ring gear 4 is greater than a preset second target rotation speed (e.g., 5rpm), and a fault notification of the electric drive system based on the planet wheel is not received, the drive motor may be controlled to execute a preset second speed control mode, and in addition, through the second speed control mode, an active synchronization function may also be implemented, so that wear of the ring gear 4 and the locking mechanism 9 is reduced, and a dynamic corresponding special effect is improved.
In addition, if a failure notification of the planet-wheel based electric drive system is received, i.e. the planet-wheel based electric drive system fails, the failure handling mode may be entered.
In S122, in the case where the second rotation speed is not greater than the preset second target rotation speed, the lock mechanism 9 is controlled to be in the second position, and the lock mechanism 9 is in the locked state with the ring gear 4.
The second position may be any position where the locking mechanism 9 can lock the ring gear 4.
Specifically, after the driving motor 1 executes the preset second speed control mode, the second rotation speed of the ring gear 4 may be indirectly controlled not to be greater than the preset second target rotation speed through the coupling action of the planet gear 3, and in the case that the second rotation speed is not greater than the preset second target rotation speed, the locking mechanism 9 may be controlled to execute the locking operation, that is, the locking mechanism 9 is controlled to be in the second position.
The embodiment of the specification provides a planet wheel-based electric drive method, which is applied to a planet wheel-based electric drive system, and the planet wheel-based electric drive system comprises: the driving mechanism comprises a driving motor, a planet gear transmission device, a speed reducing device, a half shaft and a locking mechanism, wherein the planet gear transmission device comprises a sun gear, a planet carrier and a gear ring; a transmission shaft of the driving motor is connected with the sun gear; the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through a half shaft; when the locking mechanism is at the first position, the locking mechanism and the gear ring are in a disengaged state, and the gear ring is in a follow-up state with the planet gear. Therefore, the driving motor and the transmission system can be not completely separated physically, the function of realizing power decoupling of the driving motor can be realized, no-load loss generated by the driving motor is reduced even if the gear ring is in a follow-up state with the planet wheel, and meanwhile, the danger of high-pressure exposure of the electric driving system can be reduced to the maximum extent, and the safety of the electric driving system is improved.
Embodiments of the present disclosure provide a planetary-wheel-based electrically-driven vehicle including the above-mentioned planetary-wheel-based electrically-driven system, where the planetary-wheel-based electrically-driven system includes: the device comprises a driving motor 1, a planet wheel transmission device comprising a sun wheel 2, a planet wheel 3 and a gear ring 4, a speed reducing device 6, a half shaft 7 and a locking mechanism which are sequentially connected along a power transmission path;
a transmission shaft of the driving motor 1 is connected with the sun gear 2;
the planet carrier 5 of the planet wheel 3 is connected with a driving gear of a speed reducing device 6, and the speed reducing device 6 is connected with a wheel 8 through a half shaft 7;
when the locking mechanism 9 is in the first position, the locking mechanism 9 is in a disengaged state with the ring gear 4, and the ring gear 4 is in a follow-up state with the planet gears 3.
When the locking mechanism 9 is in the second position, the locking mechanism 9 and the gear ring 4 are in a locked state, and the power output by the driving motor 1 is transmitted to the speed reduction device 6 through the planetary gear transmission device and is transmitted to the wheels 8 through the speed reduction device 6 and the half shafts.
The reduction device 6 comprises a final drive 601 and a differential 602, the final drive 601 being connectable to the planet carrier 5, the differential 602 being connectable to the half-shafts 7, the half-shafts 7 being connectable to the wheels 8.
Further, the electrically driven vehicle based on a planetary gear includes the electrically driven method based on a planetary gear, which may perform the third embodiment or the fourth embodiment described above, the method including:
receiving a release instruction for the lock mechanism 9;
controlling the locking mechanism 9 to be in a first position, the locking mechanism 9 and the gear ring 4 to be in a disengaged state, and the gear ring 4 to be in a follow-up state with the planet wheel 3;
acquiring a first rotating speed of the driving motor 1, wherein the first rotating speed is a speed absolute value without direction;
and if the first rotating speed is greater than a preset first target rotating speed, controlling the driving motor 1 to execute a preset first speed control mode so as to reduce the rotating speed of the driving motor 1, so that the no-load loss value generated by the driving motor 1 is smaller than a preset no-load loss value.
Optionally, the method further comprises:
receiving a lock instruction for the lock mechanism 9;
acquiring a second rotating speed of the gear ring 4, wherein the second rotating speed is a speed absolute value without direction;
if the second rotating speed is greater than a preset second target rotating speed, controlling the driving motor 1 to execute a preset second speed control mode so as to change the rotating speed of the driving motor 1 and reduce the second rotating speed of the gear ring 4 under the coupling action of the planet wheel 3;
and controlling the locking mechanism 9 to be in a second position under the condition that the second rotating speed is not greater than a preset second target rotating speed, wherein the locking mechanism 9 and the gear ring 4 are in a locking state.
Optionally, if the first rotation speed is greater than a preset first target rotation speed, controlling the driving motor 1 to execute a preset first speed control mode, including;
acquiring a no-load loss value corresponding to the first rotating speed;
and if the no-load loss value is not less than a preset no-load loss value threshold value, controlling the driving motor 1 to execute a preset first speed control mode.
Optionally, the obtaining of the no-load loss value corresponding to the first rotation speed includes:
determining a first torque to which the drive motor 1 is subjected based on the number of teeth of the sun gear 2, the number of teeth of the ring gear 4, and the inherent rolling friction of the ring gear 4 bearing;
determining the first torque as a drag torque if the first rotational speed is greater than the preset first target rotational speed;
determining the no-load loss value based on the drag torque and the first rotational speed.
Optionally, the preset first speed control mode includes one or more of a preset speed regulation control mode, a preset deceleration control mode and an active short circuit control mode.
Optionally, the preset second speed control mode comprises one or more of a preset speed regulation control mode and a preset acceleration control mode.
The embodiment of the specification provides a planetary wheel-based electric drive vehicle, and the planetary wheel-based electric drive system comprises: the driving mechanism comprises a driving motor, a planet gear transmission device, a speed reducing device, a half shaft and a locking mechanism, wherein the planet gear transmission device comprises a sun gear, a planet carrier and a gear ring; a transmission shaft of the driving motor is connected with the sun gear; the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through a half shaft; when the locking mechanism is at the first position, the locking mechanism and the gear ring are in a disengaged state, and the gear ring is in a follow-up state with the planet gear. Therefore, the driving motor and the transmission system can be not completely separated physically, the function of realizing power decoupling of the driving motor can be realized, no-load loss generated by the driving motor is reduced even if the gear ring is in a follow-up state with the planet wheel, and meanwhile, the danger of high-pressure exposure of the electric driving system can be reduced to the maximum extent, and the safety of the electric driving system is improved.
Based on the same technical concept, the embodiment of the present disclosure further provides a storage medium, which is suitable for an electrically driven vehicle including the planetary gear in the foregoing embodiment, and is used to store computer executable instructions, in a specific embodiment, the storage medium may be a usb disk, an optical disk, a hard disk, and the like, and when the storage medium stores the computer executable instructions, the storage medium implements the following process when being executed by a processor:
receiving a release instruction for the locking mechanism;
controlling the locking mechanism to be in a first position, enabling the locking mechanism to be in a disengagement state with the gear ring, and enabling the gear ring to be in a follow-up state with the planet gear;
acquiring a first rotating speed of the driving motor, wherein the first rotating speed is a speed absolute value without direction;
and if the first rotating speed is greater than a preset first target rotating speed, controlling the driving motor to execute a preset first speed control mode so as to reduce the rotating speed of the driving motor and enable a no-load loss value generated by the driving motor to be smaller than a preset no-load loss value.
Optionally, the storage medium stores computer-executable instructions that, when executed by the processor, further comprise:
receiving a locking instruction for the locking mechanism;
acquiring a second rotating speed of the gear ring, wherein the second rotating speed is a speed absolute value without direction;
if the second rotating speed is greater than a preset second target rotating speed, controlling the driving motor to execute a preset second speed control mode so as to change the rotating speed of the driving motor and reduce the second rotating speed of the gear ring under the coupling action of the planet gear;
and under the condition that the second rotating speed is not greater than a preset second target rotating speed, controlling the locking mechanism to be in a second position, and enabling the locking mechanism and the gear ring to be in a locking state.
Optionally, the computer-executable instructions stored in the storage medium, when executed by the processor, further include after determining whether the vehicle speed is greater than a vehicle speed threshold value:
acquiring a no-load loss value corresponding to the first rotating speed;
and if the no-load loss value is not less than a preset no-load loss threshold value, controlling the driving motor to execute a preset first speed control mode.
Optionally, the storage medium stores computer-executable instructions that, when executed by the processor, further comprise:
determining a first torque to which the drive motor is subjected based on the number of teeth of the sun gear, the number of teeth of the ring gear, and an inherent rolling friction force of the ring gear bearing;
determining the first torque as a drag torque if the first rotational speed is greater than the preset first target rotational speed;
determining the no-load loss value based on the drag torque and the first rotational speed.
Optionally, the preset first speed control mode includes one or more of a preset speed regulation control mode, a preset deceleration control mode and an active short circuit control mode.
Optionally, the preset second speed control mode comprises one or more of a preset speed regulation control mode and a preset acceleration control mode.
When the computer executable instructions stored in the storage medium provided in the embodiment of the present description are executed by the processor, the driving motor and the transmission system may not be completely physically separated, and a function of power decoupling of the driving motor may be realized, so that no-load loss generated by the driving motor is reduced even if the ring gear is in a follow-up state with the planet gear, and meanwhile, the risk of high-voltage exposure of the electric drive system may be reduced to the maximum extent, and the safety of the electric drive system may be improved.
It should be noted that the embodiment related to the storage medium in this specification and the embodiment related to the vehicle driving control method in this specification are based on the same inventive concept, and therefore specific implementation of this embodiment may refer to implementation of the foregoing corresponding vehicle driving control method, and repeated details are not repeated.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
In the 30 s of the 20 th century, improvements in a technology could clearly be distinguished between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually making an Integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Hardware Description Language), traffic, pl (core universal Programming Language), HDCal (jhdware Description Language), lang, Lola, HDL, laspam, hardward Description Language (vhr Description Language), vhal (Hardware Description Language), and vhigh-Language, which are currently used in most common. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in multiple software and/or hardware when implementing the embodiments of the present description.
One skilled in the art will recognize that one or more embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, one or more embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The description has been presented with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the description. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
One or more embodiments of the present description may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. One or more embodiments of the specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of this document and is not intended to limit this document. Various modifications and changes may occur to those skilled in the art from this document. Any modifications, equivalents, improvements, etc. which come within the spirit and principle of the disclosure are intended to be included within the scope of the claims of this document.
Claims (10)
1. A planetary-based electric drive system, comprising: the driving mechanism comprises a driving motor, a planet gear transmission device, a speed reducing device, a half shaft and a locking mechanism, wherein the planet gear transmission device comprises a sun gear, a planet carrier and a gear ring;
the transmission shaft of the driving motor is connected with the sun gear;
the planet carrier is connected with a driving gear of the speed reducing device, and the speed reducing device is connected with wheels through the half shaft;
when the locking mechanism is at the first position, the locking mechanism is in a disengagement state with the gear ring, and the gear ring is in a follow-up state with the planet gear.
2. The planetary-based electric drive system of claim 1, wherein when the locking mechanism is in the second position, the locking mechanism is locked with the ring gear, and power output by the drive motor is transmitted from the planetary transmission to the reduction gear, through the reduction gear and the axle shaft, and to the wheels.
3. The planetary-based electric drive system of claim 1, wherein the reduction gear includes a final drive connected to the carrier and a differential connected to the axle shafts connected to the wheels.
4. Electrically driven vehicle based on planet wheels, characterized in that it comprises an electrically driven system based on planet wheels according to any of the preceding claims 1-3.
5. An electrically-driven method based on planetary wheels, characterized in that the method is applied to the electrically-driven vehicle based on planetary wheels according to claim 4, and comprises:
receiving a release instruction for the locking mechanism;
controlling the locking mechanism to be in a first position, enabling the locking mechanism to be in a disengagement state with the gear ring, and enabling the gear ring to be in a follow-up state with the planet gear;
acquiring a first rotating speed of the driving motor, wherein the first rotating speed is a speed absolute value without direction;
and if the first rotating speed is greater than a preset first target rotating speed, controlling the driving motor to execute a preset first speed control mode so as to reduce the rotating speed of the driving motor and enable a no-load loss value generated by the driving motor to be smaller than a preset no-load loss value.
6. The method of claim 5, further comprising:
receiving a locking instruction for the locking mechanism;
acquiring a second rotating speed of the gear ring, wherein the second rotating speed is a speed absolute value without direction;
if the second rotating speed is greater than a preset second target rotating speed, controlling the driving motor to execute a preset second speed control mode so as to change the rotating speed of the driving motor and reduce the second rotating speed of the gear ring under the coupling action of the planet gear;
and under the condition that the second rotating speed is not greater than a preset second target rotating speed, controlling the locking mechanism to be in a second position, and enabling the locking mechanism and the gear ring to be in a locking state.
7. The method of claim 5, wherein if the first rotational speed is greater than a preset first target rotational speed, controlling the drive motor to execute a preset first speed control mode comprises;
acquiring a no-load loss value corresponding to the first rotating speed;
and if the no-load loss value is not less than a preset no-load loss threshold value, controlling the driving motor to execute a preset first speed control mode.
8. The method of claim 7, wherein said obtaining a no-load loss value corresponding to said first rotational speed comprises:
determining a first torque to which the drive motor is subjected based on the number of teeth of the sun gear, the number of teeth of the ring gear, and an inherent rolling friction force of the ring gear bearing;
determining the first torque as a drag torque if the first rotational speed is greater than the preset first target rotational speed;
determining the no-load loss value based on the drag torque and the first rotational speed.
9. The method of claim 5, wherein the preset first speed control mode comprises one or more of a preset throttle control mode, a preset deceleration control mode, and an active short circuit control mode.
10. The method of claim 6, wherein the preset second speed control mode comprises one or more of a preset throttle control mode and a preset accelerator control mode.
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| CN202011132865.5A CN112265439A (en) | 2020-10-21 | 2020-10-21 | Electric drive system and method based on planet wheel and vehicle |
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| CN202011132865.5A CN112265439A (en) | 2020-10-21 | 2020-10-21 | Electric drive system and method based on planet wheel and vehicle |
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