CN110126794B

CN110126794B - New energy pure electric integrated driving device and parking control strategy thereof

Info

Publication number: CN110126794B
Application number: CN201810128771.7A
Authority: CN
Inventors: 柴旭; 钟辰宇; 熊玉杰; 钱骏; 徐大陆
Original assignee: SAIC Motor Corp Ltd; Shanghai Automobile Gear Works
Current assignee: Shanghai Automobile Industry (group) Co; Shanghai Automobile Gear Works
Priority date: 2018-02-08
Filing date: 2018-02-08
Publication date: 2020-06-09
Anticipated expiration: 2038-02-08
Also published as: CN110126794A

Abstract

The utility model provides a new forms of energy electricelectric moves integral type drive arrangement and parking control strategy thereof, includes: by the housing part that PEU end cover, PEU gear-box casing, motor gear-box casing and end cover assembly fixed connection constitute in proper order to and set gradually PEU spare part, EPP, mechanical parking mechanism, input shaft and the parking motor in the housing part, wherein: the EPP is connected with the speed reducer and used for collecting a finished automobile signal, an EPP signal, a PEU signal and an EPB signal and then outputting the signals to the VCU, and the EPP is connected with the VCU and used for receiving an execution command of parking or unlocking. The invention has high fault-tolerant rate and strict logic, avoids unexpected high-speed forced parking condition and ensures the parking safety of a driver.

Description

New energy pure electric integrated driving device and parking control strategy thereof

Technical Field

The invention relates to the technology in the field of pure electric vehicles, in particular to a new energy pure electric integrated driving device and a parking control strategy thereof.

Background

As the next development direction of the automobile, the related technology is mature day by day, and the rotating speed of the motor is higher and higher, so that the new energy automobile becomes one of the development directions. Inputting high rotating speed is a new requirement for a new energy reduction gearbox. A driving device on the market adopts a reduction gearbox and a motor in a split type and adopts a spline to transmit torque. The disadvantages are large volume and poor performance at high rotational speeds.

Aiming at the EPB (electronic parking brake) system which is mature day by day, a reduction gearbox needs to be provided with a parking mechanism to meet the requirements of regulations, otherwise, the whole vehicle cannot use the EPB. The large volume of the PEU (power control unit) and the reduction box are supplied separately, and the external dimensions of the PEU (power control unit) have to be increased to ensure the output power of the inverter and the motor, which leads to the increase of the overall occupied space of the driving system and contradicts to the guarantee of the occupied space of the automobile as much as possible. In particular, since the rear wheel position of the automobile does not have a space for arranging an electric drive system having a large size, such as a front engine room, it is not possible to arrange such an electric drive system for driving the rear wheels, and the arrangement of the drive system must be designed separately, which leads to an increase in cost. And the integration of the whole vehicle subsystem is not facilitated.

Disclosure of Invention

Aiming at the defects that the structure is huge, the PEU system cannot be inherited, and the transmission efficiency is low in the prior art, the invention provides the new energy pure electric integrated driving device and the parking control strategy thereof, which have the advantages of high fault tolerance rate and strict logic, avoid the unexpected high-speed forced parking condition and ensure the parking safety of a driver.

The invention is realized by the following technical scheme:

the invention comprises the following steps: by the housing part that PEU end cover, PEU gear-box casing, motor gear-box casing and end cover assembly fixed connection constitute in proper order to and set gradually PEU spare part, EPP (electron parking drive arrangement), machinery parking mechanism, input shaft and parking motor in the housing part, wherein: the EPP is connected with a control end of a parking motor and outputs a parking or unlocking instruction, an output end of the parking motor is connected with a mechanical parking mechanism, the EPP is connected with a reduction gearbox and outputs a finished automobile signal, an EPP signal, a PEU signal and an EPB signal to a VCU (finished automobile controller) after acquiring the finished automobile signal, the EPP signal, the PEU signal and the EPB signal, and the EPP is connected with the VCU and receives an execution instruction of parking or unlocking.

Mechanical parking mechanism include worm gear, pawl and ratchet, wherein: the worm gear drives the pawl to park the pawl in the ratchet wheel to achieve parking or drives the pawl to pull the pawl out of the ratchet wheel to achieve unlocking.

And a Hall sensor connected with the VCU is arranged in the worm gear, and the sensor detects the corner position and outputs the corner position to the VCU.

The VCU carries out parking judgment and unlocking judgment according to a finished automobile signal acquired by EPP (electric power unit), and outputs the judged parking or unlocking execution instruction to EPP (electronic programmable processing), PEU (personal electronic unit) and EPB (electronic programmable board) respectively, and then judges whether parking or unlocking is successful or not according to the EPP signal, the PEU signal and the EPB signal fed back by the EPP.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a flow chart illustrating a parking control method according to the present invention;

FIG. 3 is a schematic flow chart of an embodiment parking unlock process;

in the figure: the device comprises a PEU end cover 1, a PEU spare part 2, an insulating block 3, an EPP4, an input shaft 5, a motor rotor assembly 6, an end cover assembly 7, an inner water jacket 8, a motor stator 9, a motor reduction gearbox shell 10, a mechanical parking mechanism 11 and a PEU reduction gearbox shell 12.

Detailed Description

As shown in fig. 1, the present embodiment includes: by the housing part that PEU end cover 1, PEU reducing gear box casing 12, motor reducing gear box casing 10 and end cover assembly 7 fixed connection constitute in proper order to and set up PEU spare part 2, EPP4, mechanical parking mechanism 11, input shaft 5 and the parking motor in the housing part in proper order, wherein:

the parking motor includes: a motor stator 9 with an inner water jacket 8 and a motor rotor assembly 6 arranged in the motor stator 9.

The VCU performs parking determination and unlocking determination according to a vehicle signal acquired by the EPP, respectively outputs a determined parking or unlocking execution instruction to the EPP, the PEU, and the EPB, and then determines whether parking or unlocking is successful according to the EPP signal, the PEU signal, and the EPB signal fed back by the EPP.

The whole vehicle signal comprises: the system comprises a brake pedal opening signal, an accelerator opening signal, a whole vehicle running speed and a whole vehicle gear signal;

the EPP signal comprises: a worm gear and worm position signal of the mechanical parking mechanism and a parking motor working signal.

The PEU signal includes: motor speed signal, motor output torque signal, motor temperature signal.

The EPB signal comprises: a brake disc rotation speed signal and a brake shoe position signal.

The parking judgment means that: the VCU judges that a driver has the intention of starting a parking mode through the collected parking gear signals or the whole vehicle power-off signals, the VCU compares the running speed of the whole vehicle collected by the whole vehicle speed sensor with a set vehicle speed threshold value when the parking is allowed, and when the speed of the whole vehicle is smaller than the vehicle speed threshold value, the VCU judges that a parking instruction is effective.

The unlocking judgment is as follows: the VCU judges that the driver has the intention of parking unlocking through the collected D gear or R gear signals, and at the moment, the VCU sends an unlocking instruction to the EPP through the CAN bus.

The executing instruction of parking or unlocking, namely the VCU sends a parking instruction to the EPP through the CAN bus, the EPP sends the parking instruction to the parking motor after receiving a finished automobile signal, the parking motor starts to start to drive a worm gear of the mechanical parking mechanism, and the worm gear drives the pawl to park into the ratchet wheel through driving the pawl to complete a parking task; or:

after receiving a finished automobile signal, the EPP issues an unlocking instruction to the parking motor, the parking motor starts to start to drive a worm gear of the mechanical parking mechanism, and the worm gear pulls out the pawl from the ratchet wheel through driving the pawl to complete an unlocking task. At the moment, a Hall sensor inside a worm and gear matched with the parking motor CAN detect the corner position, when the corner position meets the requirement, EPP CAN make the parking motor stop working and feed back the unlocking completed signal to VCU through a CAN bus.

The judgment of whether parking or unlocking is successful refers to the following steps: a position sensor positioned in a worm gear of the parking mechanism feeds back the angle condition to the VCU to detect the corner position, when the corner position meets the requirement, the EPP CAN make the parking motor stop working and feed back the parking completion signal to the VCU through a CAN bus; when the speed of the whole vehicle exceeds the threshold value of the parking allowable speed, the VCU sends a standby signal to the EPP after receiving a signal of engaging the P gear, the parking gear is in a standby mode, and at the moment, the VCU sends a parking instruction to the EPB system to start the electronic brake, so that the whole vehicle starts to decelerate. The speed sensor feeds back the speed of the whole vehicle to the VCU, when the speed of the whole vehicle is reduced to be below a parking required speed threshold value, the VCU sends out an instruction again to require the parking to start, at the moment, when the vehicle is switched to a forward gear or a reverse gear, the instruction requiring the speed reduction of the whole vehicle is cancelled, and when the EPB cannot work, the parking is not effective; preferably, when the EPP checks that any information of the whole vehicle sent by the CAN bus cannot be read, the information is read again to check whether packet loss continues. If the three cycles still cannot be read, the VCU is fed back to prompt a driver to brake by a foot brake. And starting the parking motor when the brake sensor feeds back that the brake is applied.

When the EPP receives an unlocking instruction of the whole vehicle, whether the rotating speed of a driving motor of the whole vehicle and the rotating speed of a driving wheel can be obtained or not is checked. And starting the parking motor for reverse rotation as long as one group is available. And if the signals cannot be acquired, checking the validity and the working state of the EPB signal of the electronic hand brake. When the EPB is effective, the parking motor can still be directly started for reverse rotation. When the EPB has no signal or does not work, a driver is prompted to implement a foot brake, and the parking motor is reversed after the foot brake is implemented. A Hall sensor in a worm gear of the parking motor feeds back the parking to the controller and then completes the whole parking work; preferably, when the EPP checks that any information of the whole vehicle sent by the CAN bus cannot be read, the information is read again to check whether packet loss continues. And if the three cycles still cannot be read, the VCU is fed back to prompt the driver to restart the vehicle.

The vehicle speed threshold value is as follows: when the speed of the vehicle is greater than the threshold value and the P gear is engaged, the whole vehicle does not execute a parking instruction, and the damage to a parking mechanism caused by impact force generated by parking when the speed of the vehicle is too high is avoided.

The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The utility model provides a pure electronic integral type drive arrangement of new forms of energy which characterized in that includes: by the power control unit end cover, power control unit gear box casing, motor gear box casing and the housing part that the end cover assembly fixed connection constitutes in proper order to and set gradually power control unit spare part, electron parking drive arrangement, machinery parking mechanism, input shaft and parking motor in the housing part, wherein: the electronic parking driving device is connected with a control end of a parking motor and outputs a parking or unlocking instruction, an output end of the parking motor is connected with a mechanical parking mechanism, the electronic parking driving device is connected with a reduction gearbox and outputs a finished automobile signal, an EPP signal, a PEU signal and an EPB signal to a VCU after acquiring the finished automobile signal, the EPP signal, the PEU signal and the EPB signal, and the electronic parking driving device is connected with the VCU and receives a parking or unlocking execution instruction;

the EPP signal comprises: a worm gear and worm position signal and a parking motor working signal of the mechanical parking mechanism;

the PEU signal includes: a motor rotating speed signal, a motor output torque signal and a motor temperature signal;

2. The pure electric integrated driving device of new forms of energy of claim 1, characterized in that, mechanical parking mechanism include worm gear, pawl and ratchet, wherein: the worm gear drives the pawl to park the pawl in the ratchet wheel to achieve parking or drives the pawl to pull the pawl out of the ratchet wheel to achieve unlocking.

3. The new-energy pure electric integrated driving device as claimed in claim 2, wherein a hall sensor connected with the VCU is arranged in the worm gear, and the hall sensor detects a rotation angle position and outputs the rotation angle position to the VCU.

4. A parking control method based on the new-energy pure electric integrated driving device of any one of claims 1-3 is characterized in that a VCU performs parking judgment and unlocking judgment according to a whole vehicle signal acquired by an electronic parking driving device, and outputs a judged parking or unlocking execution instruction to the electronic parking driving device, a power control unit and an EPB respectively, and then judges whether parking or unlocking is successful according to an EPP signal, a PEU signal and an EPB signal fed back by the electronic parking driving device;

the whole vehicle signal comprises: the opening degree signal of a brake pedal, the opening degree signal of an accelerator, the running speed of the whole vehicle and the gear signal of the whole vehicle.

5. The parking control method according to claim 4, wherein the parking determination is: the VCU judges that a driver has the intention of starting a parking mode through the collected parking gear signals or the whole vehicle power-off signals, the VCU compares the running speed of the whole vehicle collected by the whole vehicle speed sensor with a set vehicle speed threshold value when the parking is allowed, and when the speed of the whole vehicle is smaller than the vehicle speed threshold value, the VCU judges that a parking instruction is effective.

6. The parking control method according to claim 4, wherein the unlock determination is: the VCU judges that the driver has the intention of parking unlocking through the collected D gear or R gear signals, and at the moment, the VCU sends an unlocking instruction to the electronic parking driving device through the CAN bus.

7. The parking control method according to claim 4, wherein the execution command of parking or unlocking is that the VCU sends a parking command to the electronic parking driving device through a CAN bus, the electronic parking driving device sends a parking command to the parking motor after receiving a finished automobile signal, the parking motor starts to start to drive a worm gear of the mechanical parking mechanism, and the worm gear drives a pawl to park in a ratchet wheel through a pawl so as to complete a parking task; or:

electronic parking drive arrangement is after accepting whole car signal, assign the unblock instruction to the parking motor, the parking motor starts to start, drive the worm gear of mechanical parking mechanism, the worm gear extracts the pawl from among the ratchet through driving the pawl, accomplish the unblock task, the inside hall sensor of worm gear that matches with the parking motor this moment CAN detect the corner position, when the corner position satisfies the requirement, electronic parking drive arrangement CAN make down and let the parking motor stop work, and give VCU through the CAN bus with the signal that the unblock was accomplished.

8. The parking control method according to claim 4, wherein the judging whether the parking or the unlocking is successful is: a position sensor positioned in a worm gear of the parking mechanism feeds back the angle condition to a VCU to detect the corner position, when the corner position meets the requirement, the electronic parking driving device CAN command the parking motor to stop working, and feeds back a parking completion signal to the VCU through a CAN bus; when the speed of the whole vehicle exceeds a threshold value of a parking allowable speed, a VCU sends a standby signal to an electronic parking driving device after receiving a signal of engaging a P gear, the parking gear is in a standby mode, the VCU sends a parking instruction to an EPB system at the moment, an electronic brake is started, the whole vehicle starts to decelerate, a speed sensor can feed the speed of the whole vehicle back to the VCU, when the speed of the whole vehicle is reduced to be below the threshold value of the parking required speed, the VCU sends an instruction again to request to start parking, at the moment, when the vehicle is switched to a forward gear or a reverse gear, an instruction of outputting the requirement of decelerating the whole vehicle is cancelled, and when the EPB cannot work; when the electronic parking driving device receives an unlocking instruction of the whole vehicle, whether the rotating speed of a driving motor of the whole vehicle and the rotating speed of a driving wheel can be detected, the parking motor can be started to rotate reversely as long as one group of the electronic parking driving device can be detected, when the electronic parking driving device cannot be detected, the validity and the working state of an EPB signal of an electronic hand brake are detected, when the EPB takes effect, the parking motor can be directly started to rotate reversely, when the EPB has no signal or does not work, a driver is prompted to implement a foot brake, the parking motor is rotated reversely after the foot brake is implemented, and the whole parking work is completed after a Hall sensor in a worm gear of the parking motor feeds back parking to a.

9. The parking control method according to claim 5, wherein the vehicle speed threshold is: when the speed of the vehicle is greater than the threshold value and the P gear is engaged, the whole vehicle does not execute a parking instruction, and the damage to a parking mechanism caused by impact force generated by parking when the speed of the vehicle is too high is avoided.

10. The parking control method according to claim 4, wherein when judging whether parking or unlocking is successful, when the electronic parking driving device checks that any information of the entire vehicle sent by the CAN bus cannot be read, the electronic parking driving device reads again and checks whether packet loss continues; and when the vehicle still cannot be read after three cycles, the VCU is fed back to prompt a driver to brake the foot, and when the brake sensor feeds back that the vehicle is braked, the parking motor is started, or the driver is prompted to restart the vehicle.