CN105015364A - Driving control method and device of four-wheel electric vehicle - Google Patents
Driving control method and device of four-wheel electric vehicle Download PDFInfo
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Abstract
The invention provides a driving control method and device of a four-wheel electric vehicle. The driving control method comprises the following steps: the current driving mode of the four-wheel electric vehicle is determined, wherein the driving modes comprise a forced single-motor driving mode, a preferential single-motor driving mode and a four-wheel driving mode; if the current driving mode of the four-wheel electric vehicle is the forced single-motor driving mode, a whole-vehicle controller controls one motor to participate in driving, and the other motor is in a non-operating state; if the current driving mode of the four-wheel electric vehicle is the preferential single-motor driving mode, when the driving request torque does not exceed the torque of the rear motor, the whole-vehicle controller controls the rear motor to participate in driving, and the front motor is in the non-operating state; the front motor only participates in driving when the four-wheel electric vehicle sharply accelerates; if the current driving mode of the four-wheel electric vehicle is the four-wheel driving mode, the whole-wheel controller controls the front motor and the rear motor to participate in driving simultaneously, and the torque is distributed to the front motor and the rear motor according to the distribution of front loads and rear loads.
Description
Technical field
The present invention relates to Control of Electric Vehicles field, particularly relate to a kind of four-drive electric car drived control method and device.
Background technology
Along with modern society is to the increase of the idea of environmental protection, electronlmobil is accepted by increasing popular.It is power that electronlmobil refers to vehicle power, drives wheels travel with motor, meets the vehicle of arteries of communication, legislative control on safety requirements.Due to less relative to orthodox car to environmental concerns, its prospect is extensively had an optimistic view of.
For pure electric automobile, the rear-guard of single motor or precursor vehicle is adopted to be subject to the restriction of tire adhesion force, acceleration capability is difficult to reach target requirement, so arrange before and after generally taking that motor (double-motor) carries out four wheel drive, such entire car controller just needs reasonably to distribute front and back wheel current moment.
In the prior art, entire car controller distributes the current moment of front and back wheel mainly based on following 2 considerations: 1. Energy Angle, elec. vehicle limits by battery technology at present, continual mileage is general shorter, energy-conservation comparatively traditional vehicle requires higher, if use 4 wheel driven pattern to be certain to improve power consumption reduce continual mileage, so need output torque before and after reasonable distribution to improve drive system combined efficiency always.2. performance perspective: four-wheel drive system is commonly used to high performance vehicle, high performance vehicle moment of torsion is all larger, moves during acceleration after center of gravity, and full car weight amount will move to rear axle, causes front axle load to reduce.Even if the car of f-w-d also can skid on good road surface, four wheel drive distributes moment before wheel generation slipping in good time can ensure wheel acceleration capability.When the automobile generation tire slipping that two-wheeled (front-wheel or trailing wheel) drives time, the moment of engine can only be reduced, and the automobile of four wheel drive just distributes each wheel moment automatically by electronic system, can more prevent the situation of tyre skidding from occurring by actv..
Based on above-mentioned consideration, referring again to traditional 4 wheel driven vehicle, so 4 wheel driven pure electric automobile can have 3 kinds of 4 wheel driven types: AWD, 4 wheel driven, in good time 4 wheel driven when holding concurrently.
AWD: front and back wheel maintains four wheel drive pattern forever, during traveling, output torque presses fixed allocation proportional distribution in front and back wheel.It is handling and travel tracking that full-time driving has good driving, shortcoming be when at the uniform velocity travelling before and after motor to be all in Smaller load work area combined efficiency low, economy is bad.
4 wheel driven when holding concurrently: by chaufeur according to surface conditions, whether enter 4 wheel driven by model selection, shortcoming is that chaufeur will have certain experience and just can grasp switching time.
In good time 4 wheel driven: adopt the vehicle in good time driven, which kind of drive pattern it selects by conputer controlled, normal road surface generally adopts two drivings, if road surface is bad or drive wheel skids, controller automatically can be measured to exist side by side and distribute to other two-wheeled by engine output torque, be switched to four wheel drive state, handle simple.Its shortcoming needs to increase road conditions to detect relevant sensor, and the complicated immediate reaction of controller algorithm is comparatively slow, lacks Driving.
Summary of the invention
From aforementioned background art, for pure electric automobile, if need the service efficiency improving drive system, then need preferentially to use two-wheel drive; If need the safety performance of raising traveling and pass through performance, then need to remain on 4 wheel driven pattern.And 3 kinds of 4 wheel driven types of the prior art: AWD, all there is defect in varying degrees in 4 wheel driven, in good time 4 wheel driven when holding concurrently.The present invention will solve 4 wheel driven pure electric automobile to accelerate, and at the uniform velocity travel, the problem that before and after under bad road conditions, how motor torque distributes, to ensure car load economy and safety performance.
For solving the problems of the technologies described above, the invention provides a kind of four-drive electric car drived control method, comprising:
Determine the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
If the current drive pattern of four-drive electric car is for forcing single motor drive mode, then vehicle control unit controls motor participates in driving, and another one motor is in off position;
If the current drive pattern of four-drive electric car is preferential single motor drive mode, then when driving request moment is no more than rear motor moment, vehicle control unit controls rear motor participates in driving, and front motor is in off position; Described front motor only participates in driving when the anxious acceleration of described four-drive electric car;
If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then before and after vehicle control unit controls, motor participates in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.
Wherein, if described four-drive electric car has a motor to break down, then described four-drive electric car adopts and forces single motor drive mode, and the normal motor of vehicle control unit controls participates in driving, and an other motor broken down is in off position.
Wherein, when the drive pattern that described four-drive electric car is current is preferential single motor drive mode, judge that described four-drive electric car is the need of entering 4 wheel driven pattern;
If judge, described four-drive electric car needs to enter 4 wheel driven pattern, then reminding user is switched to 4 wheel driven pattern or automatically switches to 4 wheel driven pattern; If judge, described four-drive electric car does not need to enter 4 wheel driven pattern, then keep current preference list motor drive mode.
Wherein, the described four-drive electric car of described judgement comprises the need of the factor entering 4 wheel driven pattern: vehicle trouble states, user model are selected, network end server road conditions judge, wheel slip monitoring.
Wherein, described user model is selected to comprise: two drive pattern, in good time 4 wheel driven pattern and real-time 4 wheel driven pattern;
User model is chosen as two when driving pattern, and preferential single motor drives, and when driving request moment is no more than current motor moment, keep single motor to drive, another one motor is in off position always; When single motor torque does not meet driving request moment, network end server is by four-drive electric car instrument or multimedia to user's pushed information, and prompting user selects 4 wheel driven pattern;
When user model is chosen as in good time 4 wheel driven, if when network end server does not have recommendation 4 wheel driven pattern or wheelslip does not occur, this pattern and two drive pattern equally preferential single motor drive; Automatically enter 4 wheel driven pattern when network end server recommendation 4 wheel driven pattern or wheel generation slippage, entire car controller according to front and back wheel load by Torque distribution to front and back motor; When no longer slippage no longer occurs network end server for recommendation 4 wheel driven pattern or wheel, time delay a period of time returns preferential single motor and drives;
When user model is chosen as real-time 4 wheel driven, entire car controller presses fore-aft loads proportional distribution moment to front and back motor.
Wherein, network end server road conditions judge to comprise:
Network end server, for four-drive electric car drive system, sets up pavement state data bank, determines whether that the road conditions of recommending described four-drive electric car to be switched to 4 wheel driven pattern judge in conjunction with real-time road congestion conditions information and Weather information.
Wherein, network end server also counting user initiatively opens the section of 4 wheel driven pattern, enters the condition of 4 wheel driven pattern as one, determines whether to recommend vehicle be switched to 4 wheel driven pattern after judging comprehensive analysis in conjunction with described road conditions.
Corresponding, the present invention also provides a kind of four-drive electric car driving control device, comprising: drive pattern selects module and drive control module;
Drive pattern selects module, for determining the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
Drive control module, for selecting the determined drive pattern of module to drive motor according to described drive pattern;
If the current drive pattern of four-drive electric car is for forcing single motor drive mode, then drive control module controls a motor and participates in driving, and another one motor is in off position;
If the current drive pattern of four-drive electric car is preferential single motor drive mode, then when driving request moment is no more than rear motor moment, drive control module controls rear motor and participates in driving, and front motor is in off position; Described front motor only participates in driving when the anxious acceleration of described four-drive electric car;
If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then drive control module control before and after motor participate in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.
Wherein, described drive pattern selects module to comprise: mode selecting unit and mode switch element;
Mode selecting unit, for determining the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
Mode switch element, when being preferential single motor drive mode for the drive pattern current at described four-drive electric car, judges that described four-drive electric car is the need of entering 4 wheel driven pattern;
If judge, described four-drive electric car needs to enter 4 wheel driven pattern, then reminding user is switched to 4 wheel driven pattern or automatically switches to 4 wheel driven pattern; If judge, described four-drive electric car does not need to enter 4 wheel driven pattern, then keep current preference list motor drive mode.
Wherein, described mode switch element comprises: the monitoring of vehicle trouble states subelement, wheel slip subelement, user model chooser unit, network service subelement, switching judging subelement;
Whether vehicle trouble states subelement exists fault for detecting four-drive electric car motor;
Wheel slip monitoring subelement is for detecting the wheel slip of four-drive electric car;
User model chooser unit is used for providing two to drive driving model in pattern, in good time 4 wheel driven and real-time 4 wheel driven 3 to user;
Network service subelement, for receiving the information of network end server; Described network end server is used for setting up pavement state data bank for four-drive electric car drive system, and determines whether to recommend user to be switched to 4 wheel driven pattern in conjunction with road congestion conditions information and Weather information;
Switching judging subelement is used for determining whether to recommend the user of described four-drive electric car be switched to 4 wheel driven pattern or automatically described four-drive electric car be switched to 4 wheel driven pattern according to above-mentioned subelement.
Wherein, described two patterns of driving are: preferential single motor drives, and when driving request moment is no more than current motor moment, keep single motor to drive, another one motor is in off position always; When single motor torque does not meet driving request moment, network end server is by four-drive electric car instrument or multimedia to user's pushed information, and prompting user selects 4 wheel driven pattern;
Described in good time 4 wheel driven is: if when network end server does not have recommendation 4 wheel driven pattern or wheelslip does not occur, this pattern and two drive pattern equally preferential single motor drive; Automatically enter 4 wheel driven pattern when network end server recommendation 4 wheel driven pattern or wheel generation slippage, entire car controller according to front and back wheel load by Torque distribution to front and back motor; When no longer slippage no longer occurs network end server for recommendation 4 wheel driven pattern or wheel, time delay a period of time returns preferential single motor and drives;
Described real-time 4 wheel driven is: entire car controller by fore-aft loads proportional distribution moment to front and back motor.
Wherein, network end server also counting user initiatively opens the section of 4 wheel driven pattern, enters the condition of 4 wheel driven pattern as one, determines whether to recommend vehicle be switched to 4 wheel driven pattern after judging comprehensive analysis in conjunction with described road conditions.
Four-drive electric car drived control method provided by the invention and device realize the 4 wheel driven function of fuel oil 4-wheel driven car by Dual-motors Driving, and by vehicle control unit controls more flexibly by Torque distribution to front and back motor, realize Torque distribution more reasonably, ensure driving safety performance.Simultaneously, four-drive electric car drived control method provided by the invention and device can also obtain the 4 wheel driven schema recommendation that network end server provides, reminding user or directly switching 4 wheel driven pattern, reduce user in bad road conditions, forget the situation of opening 4 wheel driven function, improve driving safety performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is four-drive electric car drived control method first embodiment schematic flow sheet provided by the invention;
Fig. 2 is four-drive electric car drived control method second embodiment schematic flow sheet provided by the invention;
Fig. 3 is entire car controller Torque distribution schematic flow sheet in four-drive electric car drived control method provided by the invention;
Fig. 4 is the Torque distribution schematic flow sheet of four-drive electric car drived control method provided by the invention entire car controller in a failure mode;
Fig. 5 is the Torque distribution strategy schematic diagram of four-drive electric car drived control method provided by the invention entire car controller under preferential single motor drive mode;
Fig. 6 is the Torque distribution strategy schematic diagram of four-drive electric car drived control method provided by the invention entire car controller under 4 wheel driven pattern;
Fig. 7 is that in four-drive electric car drived control method provided by the invention, drive pattern judges schematic flow sheet;
Fig. 8 is four-drive electric car driving control device first example structure schematic diagram provided by the invention;
Fig. 9 is four-drive electric car driving control device mode switch element structural representation provided by the invention;
Figure 10 is four-drive electric car configuration schematic diagram provided by the invention.
Detailed description of the invention
Four-drive electric car drived control method provided by the invention and device realize the 4 wheel driven function of fuel oil 4-wheel driven car by Dual-motors Driving, and by vehicle control unit controls more flexibly by Torque distribution to front and back motor, realize Torque distribution more reasonably, ensure driving safety performance.Simultaneously, four-drive electric car drived control method provided by the invention and device can also obtain the 4 wheel driven schema recommendation that network end server provides, reminding user or directly switching 4 wheel driven pattern, reduce user in bad road conditions, forget the situation of opening 4 wheel driven function, improve driving safety performance.
See Fig. 1, be four-drive electric car drived control method first embodiment schematic flow sheet provided by the invention, as shown in Figure 1, this four-drive electric car drived control method comprises:
Step S101, determines the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern; If the current drive pattern of four-drive electric car for forcing single motor drive mode, then performs step S102; If the current drive pattern of four-drive electric car is preferential single motor drive mode, then perform step S103 and S104; If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then perform step S105.
Step S102, the current drive pattern of four-drive electric car is for forcing single motor drive mode, and vehicle control unit controls motor participates in driving, and another one motor is in off position.
Step S103, the current drive pattern of four-drive electric car is preferential single motor drive mode, and when driving request moment is no more than rear motor moment, vehicle control unit controls rear motor participates in driving, and front motor is in off position.
Step S104, when described four-drive electric car suddenly accelerates, described front motor participates in driving.
Step S105, the current drive pattern of four-drive electric car is 4 wheel driven pattern, and before and after vehicle control unit controls, motor participates in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.
Four-drive electric car drived control method provided by the invention and device realize the 4 wheel driven function of fuel oil 4-wheel driven car by Dual-motors Driving, and by vehicle control unit controls more flexibly by Torque distribution to front and back motor, realize Torque distribution more reasonably, ensure driving safety performance.
See Fig. 2, it is four-drive electric car drived control method second embodiment schematic flow sheet provided by the invention.In the present embodiment, this four-drive electric car drived control method of description is specifically comprised:
Step S201, determines the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern; If the current drive pattern of four-drive electric car for forcing single motor drive mode, then performs step S202; If the current drive pattern of four-drive electric car is preferential single motor drive mode, then perform step S203; If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then perform step S204.
More specifically, for pure electric automobile, normal controller can drive driving request moment (speed of a motor vehicle and throttle) by resolving, then carry out Torque distribution (see Fig. 3), control front axis drive motor (front motor) and rear axis drive motor (rear motor) realizes forerunner, rear-guard and 4 wheel driven.But single in actual use motor drives acceleration capability weak so can only preferentially use single motor to drive, when throttle is larger, another one motor is exerted oneself guarantee acceleration capability.So vehicle driving patterns is divided into following 3 kinds by the present invention: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern.
Step S202, the current drive pattern of four-drive electric car is for forcing single motor drive mode, and vehicle control unit controls motor participates in driving, and another one motor is in off position.
It will be understood by those skilled in the art that, force single motor drive mode also can as electrical fault pattern, adopt the electronlmobil of Dual-motors Driving, when single motor breaks down, another normal motor (see Fig. 4 Torque distribution) can be given by entire car controller by Torque distribution.When single electrical fault, vehicle performance declines but can normally travel, and effectively can reduce the situation because electrical fault causes vehicle power to interrupt.
Step S203, the current drive pattern of four-drive electric car is preferential single motor drive mode (as shown in Figure 5), and when driving request moment is no more than rear motor moment, vehicle control unit controls rear motor participates in driving, and front motor is in off position.Front motor only participates in driving when the anxious acceleration of described four-drive electric car.
Step S204, the current drive pattern of four-drive electric car is 4 wheel driven pattern (as shown in Figure 6), and before and after vehicle control unit controls, motor participates in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.Rear motor and front motor moment make a concerted effort to equal driving request moment.
Further, also comprise after described step S203:
Step S205, when the drive pattern that described four-drive electric car is current is preferential single motor drive mode, judges that described four-drive electric car is the need of entering 4 wheel driven pattern; If judge, described four-drive electric car needs to enter 4 wheel driven pattern, then perform step S206, reminding user is switched to 4 wheel driven pattern or automatically switches to 4 wheel driven pattern; If judge, described four-drive electric car does not need to enter 4 wheel driven pattern, then perform step S207, keeps current preference list motor drive mode.
More specifically, described judgement four-drive electric car comprises the need of the factor entering 4 wheel driven pattern: vehicle trouble states, user model are selected, network end server road conditions judge, wheel slip monitoring.Whether vehicle trouble states monitoring mainly detects dual-motor drive system and breaks down, and is switched to another one motor drives when one of them motor abnormality, reduces vehicle and runs out of steam because of electrical fault.Wheel slip monitoring has generally been come by the controller (as ABS) gathering vehicle wheel rotational speed.It specifically judges that flow process as shown in Figure 7.
Further, the user model described in the present embodiment is selected to comprise: two drive pattern, in good time 4 wheel driven pattern and real-time 4 wheel driven pattern.Specific as follows:
User model is chosen as two when driving pattern, and preferential single motor drives, and when driving request moment is no more than current motor moment, keep single motor to drive, another one motor is in off position always; When single motor torque does not meet driving request moment, network end server is by four-drive electric car instrument or multimedia to user's pushed information, and prompting user selects 4 wheel driven pattern; When anxious acceleration, another one motor just participates in driving the acceleration capability ensureing to travel.
When user model is chosen as in good time 4 wheel driven, if when network end server does not have recommendation 4 wheel driven pattern or wheelslip does not occur, this pattern and two drive pattern equally preferential single motor drive; Automatically enter 4 wheel driven pattern when network end server recommendation 4 wheel driven pattern or wheel generation slippage, entire car controller according to front and back wheel load by Torque distribution to front and back motor; When no longer slippage no longer occurs network end server for recommendation 4 wheel driven pattern or wheel, time delay a period of time returns preferential single motor and drives.
When user model is chosen as real-time 4 wheel driven, entire car controller presses fore-aft loads proportional distribution moment to front and back motor, to improve vehicle safety energy and to pass through performance.
Further, the network end server road conditions described in the present embodiment judge to comprise:
Network end server, for four-drive electric car drive system, sets up pavement state data bank, determines whether that the road conditions of recommending described four-drive electric car to be switched to 4 wheel driven pattern judge in conjunction with real-time road congestion conditions information and Weather information.Preferably, network end server also counting user initiatively opens the section of 4 wheel driven pattern, enters the condition of 4 wheel driven pattern as one, determines whether to recommend vehicle be switched to 4 wheel driven pattern after judging comprehensive analysis in conjunction with described road conditions.When it will be appreciated by persons skilled in the art that the pure electric automobile provided in the embodiment of the present invention needs to do information interaction with network end server, pure electric automobile should be furnished with corresponding communication module to complete the information interaction with network end server.
Four-drive electric car drived control method provided by the invention realizes the 4 wheel driven function of fuel oil 4-wheel driven car by Dual-motors Driving, and by vehicle control unit controls more flexibly by Torque distribution to front and back motor, realize Torque distribution more reasonably, ensure driving safety performance.Simultaneously, four-drive electric car drived control method provided by the invention can also obtain the 4 wheel driven schema recommendation that network end server provides, reminding user or directly switching 4 wheel driven pattern, reduce user in bad road conditions, forget the situation of opening 4 wheel driven function, improve driving safety performance.
Corresponding, the present invention also provides a kind of four-drive electric car driving control device, and this four-drive electric car driving control device can realize aforesaid four-drive electric car drived control method.
See Fig. 8, be four-drive electric car driving control device first example structure schematic diagram provided by the invention, as shown in Figure 8, this four-drive electric car driving control device comprises: drive pattern selects module 1 and drive control module 2;
Drive pattern selects module 1, for determining the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
Drive control module 2, for selecting the determined drive pattern of module 1 to drive motor according to described drive pattern.More specifically, if the current drive pattern of four-drive electric car is for forcing single motor drive mode, then drive control module controls a motor and participates in driving, and another one motor is in off position; If the current drive pattern of four-drive electric car is preferential single motor drive mode, then when driving request moment is no more than rear motor moment, drive control module controls rear motor and participates in driving, and front motor is in off position; Described front motor only participates in driving when the anxious acceleration of described four-drive electric car; If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then drive control module control before and after motor participate in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.
More specifically, this drive pattern selects module 1 to comprise: mode selecting unit 11 and mode switch element 12.
Mode selecting unit 11, for determining the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern.
Mode switch element 12, when being preferential single motor drive mode for the drive pattern current at described four-drive electric car, judges that described four-drive electric car is the need of entering 4 wheel driven pattern.If judge, described four-drive electric car needs to enter 4 wheel driven pattern, then reminding user is switched to 4 wheel driven pattern or automatically switches to 4 wheel driven pattern; If judge, described four-drive electric car does not need to enter 4 wheel driven pattern, then keep current preference list motor drive mode.
Further, described mode switch element 12 Main Basis vehicle trouble states, user model selection, the judgement of webserver road conditions, wheel slip are monitored 4 aspects and are judged whether to need to be switched to 4 wheel driven pattern.Therefore, mode switch element 12(described in this is as shown in Figure 9) comprising: the monitoring of vehicle trouble states subelement 121, wheel slip subelement 122, user model chooser unit 123, network service subelement 124, switching judging subelement 125.Concrete:
Whether vehicle trouble states subelement 121 exists fault for detecting four-drive electric car motor; Be switched to another one motor to drive when one of them motor abnormality, reduce vehicle and run out of steam because of electrical fault.
Wheel slip monitoring subelement 122 is for detecting the wheel slip of four-drive electric car; Slip rate monitoring has generally been come by the controller (as ABS) of the rotating speed gathering wheel.
User model chooser unit 123 drives driving model in pattern, in good time 4 wheel driven and real-time 4 wheel driven 3 for providing two to user.Described in preceding method embodiment, so-called two patterns of driving refer to: preferential single motor drives, and when driving request moment is no more than current motor moment, keep single motor to drive, another one motor is in off position always; When single motor torque does not meet driving request moment, network end server is by four-drive electric car instrument or multimedia to user's pushed information, and prompting user selects 4 wheel driven pattern;
So-called 4 wheel driven in good time refers to: if when network end server does not have recommendation 4 wheel driven pattern or wheelslip does not occur, this pattern and two drive pattern equally preferential single motor drive; Automatically enter 4 wheel driven pattern when network end server recommendation 4 wheel driven pattern or wheel generation slippage, entire car controller according to front and back wheel load by Torque distribution to front and back motor; When no longer slippage no longer occurs network end server for recommendation 4 wheel driven pattern or wheel, time delay a period of time returns preferential single motor and drives;
So-called 4 wheel driven in real time refers to: entire car controller by fore-aft loads proportional distribution moment to front and back motor.
Network service subelement 124, for receiving the information of network end server; Described network end server is used for setting up pavement state data bank for four-drive electric car drive system, and determines whether to recommend user to be switched to 4 wheel driven pattern in conjunction with road congestion conditions information and Weather information.Preferably, network end server also counting user initiatively opens the section of 4 wheel driven pattern, enters the condition of 4 wheel driven pattern as one, determines whether to recommend vehicle be switched to 4 wheel driven pattern after judging comprehensive analysis in conjunction with described road conditions.
Switching judging subelement 125, recommends the user of described four-drive electric car be switched to 4 wheel driven pattern or automatically described four-drive electric car be switched to 4 wheel driven pattern for determining whether according to above-mentioned subelement.
It will be appreciated by those skilled in the art that, four-drive electric car driving control device provided by the invention can be implemented on existing four-drive electric car, the upgrading gone out on entire car controller software is unexpected, also needs to increase network service subelement, in order to the information interaction with network end server.As shown in Figure 10, entire car controller 3 is the four-drive electric car driving control device that the embodiment of the present invention provides, network service subelement 124 as a functional module of entire car controller 3 in order to the information interaction with network end server 4.For part four-drive electric car, in its entire car controller 10, be integrated with network service subelement, therefore do not needed again extra adding hardware, and only need upgrade to software.
Four-drive electric car driving control device provided by the invention realizes the 4 wheel driven function of fuel oil 4-wheel driven car by Dual-motors Driving, and by vehicle control unit controls more flexibly by Torque distribution to front and back motor, realize Torque distribution more reasonably, ensure driving safety performance.Simultaneously, four-drive electric car driving control device provided by the invention can also obtain the 4 wheel driven schema recommendation that network end server provides, reminding user or directly switching 4 wheel driven pattern, reduce user in bad road conditions, forget the situation of opening 4 wheel driven function, improve driving safety performance.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (12)
1. a four-drive electric car drived control method, is characterized in that, comprising:
Determine the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
If the current drive pattern of four-drive electric car is for forcing single motor drive mode, then vehicle control unit controls motor participates in driving, and another one motor is in off position;
If the current drive pattern of four-drive electric car is preferential single motor drive mode, then when driving request moment is no more than rear motor moment, vehicle control unit controls rear motor participates in driving, and front motor is in off position; Described front motor only participates in driving when the anxious acceleration of described four-drive electric car;
If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then before and after vehicle control unit controls, motor participates in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.
2. four-drive electric car drived control method as claimed in claim 1, it is characterized in that, if described four-drive electric car has a motor to break down, then described four-drive electric car adopts and forces single motor drive mode, the normal motor of vehicle control unit controls participates in driving, and an other motor broken down is in off position.
3. four-drive electric car drived control method as claimed in claim 1, is characterized in that, when the drive pattern that described four-drive electric car is current is preferential single motor drive mode, judging that described four-drive electric car is the need of entering 4 wheel driven pattern;
If judge, described four-drive electric car needs to enter 4 wheel driven pattern, then reminding user is switched to 4 wheel driven pattern or automatically switches to 4 wheel driven pattern; If judge, described four-drive electric car does not need to enter 4 wheel driven pattern, then keep current preference list motor drive mode.
4. four-drive electric car drived control method as claimed in claim 1, it is characterized in that, the described four-drive electric car of described judgement comprises the need of the factor entering 4 wheel driven pattern: vehicle trouble states, user model are selected, network end server road conditions judge, wheel slip monitoring.
5. four-drive electric car drived control method as claimed in claim 4, is characterized in that, described user model is selected to comprise: two drive pattern, in good time 4 wheel driven pattern and real-time 4 wheel driven pattern;
User model is chosen as two when driving pattern, and preferential single motor drives, and when driving request moment is no more than current motor moment, keep single motor to drive, another one motor is in off position always; When single motor torque does not meet driving request moment, network end server is by four-drive electric car instrument or multimedia to user's pushed information, and prompting user selects 4 wheel driven pattern;
When user model is chosen as in good time 4 wheel driven, if when network end server does not have recommendation 4 wheel driven pattern or wheelslip does not occur, this pattern and two drive pattern equally preferential single motor drive; Automatically enter 4 wheel driven pattern when network end server recommendation 4 wheel driven pattern or wheel generation slippage, entire car controller according to front and back wheel load by Torque distribution to front and back motor; When no longer slippage no longer occurs network end server for recommendation 4 wheel driven pattern or wheel, time delay a period of time returns preferential single motor and drives;
When user model is chosen as real-time 4 wheel driven, entire car controller presses fore-aft loads proportional distribution moment to front and back motor.
6. four-drive electric car drived control method as claimed in claim 4, is characterized in that, network end server road conditions judge to comprise:
Network end server, for four-drive electric car drive system, sets up pavement state data bank, determines whether that the road conditions of recommending described four-drive electric car to be switched to 4 wheel driven pattern judge in conjunction with real-time road congestion conditions information and Weather information.
7. four-drive electric car drived control method as claimed in claim 6, it is characterized in that, network end server also counting user initiatively opens the section of 4 wheel driven pattern, enter the condition of 4 wheel driven pattern as one, determine whether to recommend vehicle to be switched to 4 wheel driven pattern after judging comprehensive analysis in conjunction with described road conditions.
8. a four-drive electric car driving control device, is characterized in that, comprising: drive pattern selects module and drive control module;
Drive pattern selects module, for determining the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
Drive control module, for selecting the determined drive pattern of module to drive motor according to described drive pattern;
If the current drive pattern of four-drive electric car is for forcing single motor drive mode, then drive control module controls a motor and participates in driving, and another one motor is in off position;
If the current drive pattern of four-drive electric car is preferential single motor drive mode, then when driving request moment is no more than rear motor moment, drive control module controls rear motor and participates in driving, and front motor is in off position; Described front motor only participates in driving when the anxious acceleration of described four-drive electric car;
If the current drive pattern of four-drive electric car is 4 wheel driven pattern, then drive control module control before and after motor participate in driving simultaneously, and press fore-aft loads and distribute Torque distribution to front and back motor.
9. four-drive electric car driving control device as claimed in claim 8, is characterized in that, described drive pattern selects module to comprise: mode selecting unit and mode switch element;
Mode selecting unit, for determining the drive pattern that four-drive electric car is current; Described drive pattern comprises: force single motor drive mode, preferential single motor drive mode, 4 wheel driven pattern;
Mode switch element, when being preferential single motor drive mode for the drive pattern current at described four-drive electric car, judges that described four-drive electric car is the need of entering 4 wheel driven pattern;
If judge, described four-drive electric car needs to enter 4 wheel driven pattern, then reminding user is switched to 4 wheel driven pattern or automatically switches to 4 wheel driven pattern; If judge, described four-drive electric car does not need to enter 4 wheel driven pattern, then keep current preference list motor drive mode.
10. four-drive electric car driving control device as claimed in claim 9, it is characterized in that, described mode switch element comprises: the monitoring of vehicle trouble states subelement, wheel slip subelement, user model chooser unit, network service subelement, switching judging subelement;
Whether vehicle trouble states subelement exists fault for detecting four-drive electric car motor;
Wheel slip monitoring subelement is for detecting the wheel slip of four-drive electric car;
User model chooser unit is used for providing two to drive driving model in pattern, in good time 4 wheel driven and real-time 4 wheel driven 3 to user;
Network service subelement, for receiving the information of network end server; Described network end server is used for setting up pavement state data bank for four-drive electric car drive system, and determines whether to recommend user to be switched to 4 wheel driven pattern in conjunction with road congestion conditions information and Weather information;
Switching judging subelement is used for determining whether to recommend the user of described four-drive electric car be switched to 4 wheel driven pattern or automatically described four-drive electric car be switched to 4 wheel driven pattern according to above-mentioned subelement.
11. four-drive electric car driving control devices as claimed in claim 10, is characterized in that,
Described two patterns of driving are: preferential single motor drives, and when driving request moment is no more than current motor moment, keep single motor to drive, another one motor is in off position always; When single motor torque does not meet driving request moment, network end server is by four-drive electric car instrument or multimedia to user's pushed information, and prompting user selects 4 wheel driven pattern;
Described in good time 4 wheel driven is: if when network end server does not have recommendation 4 wheel driven pattern or wheelslip does not occur, this pattern and two drive pattern equally preferential single motor drive; Automatically enter 4 wheel driven pattern when network end server recommendation 4 wheel driven pattern or wheel generation slippage, entire car controller according to front and back wheel load by Torque distribution to front and back motor; When no longer slippage no longer occurs network end server for recommendation 4 wheel driven pattern or wheel, time delay a period of time returns preferential single motor and drives;
Described real-time 4 wheel driven is: entire car controller by fore-aft loads proportional distribution moment to front and back motor.
12. four-drive electric car driving control devices as claimed in claim 10, it is characterized in that, network end server also counting user initiatively opens the section of 4 wheel driven pattern, enter the condition of 4 wheel driven pattern as one, determine whether to recommend vehicle to be switched to 4 wheel driven pattern after judging comprehensive analysis in conjunction with described road conditions.
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