CN109050534A - A kind of ecology driving reminding method - Google Patents
A kind of ecology driving reminding method Download PDFInfo
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- CN109050534A CN109050534A CN201810865495.2A CN201810865495A CN109050534A CN 109050534 A CN109050534 A CN 109050534A CN 201810865495 A CN201810865495 A CN 201810865495A CN 109050534 A CN109050534 A CN 109050534A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/19—Improvement of gear change, e.g. by synchronisation or smoothing gear shift
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0604—Throttle position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The present invention relates to one of field of vehicle control ecologies to drive reminding method, and ECU is to automobile's instant velocity v, accelerator open degree, engine speed ne, acceleration a and basic shift point data handled, obtain current shift I, accelerator open degree change rate k, automotive average vehicle velocity V and speed fluctuating range Δ V；Acceleration limit value a ' is calculated to average speed V and speed fluctuating range Δ V according to fuzzy algorithmic approach, compares acceleration a and acceleration limit value a ' size, ecology is exported and drives standby signal；Meanwhile ECU first judges shift mode according to acceleration a, then obtains best shifting points, then root obtains best gear i, finally compares current shift I and best gear i, output shift standby signal；The present invention has balance driver to the shift prompt facility of dynamic property and economy demand, also there is ecology to drive prompt facility, ensure that the demand of dynamic property, reach better oil-saving effect.
Description
Technical field
The present invention relates to field of vehicle control, and specifically energy-saving driving prompts technology, to save fuel oil.
Background technique
The driving experience and driving habit of driver has a great impact to the fuel consumption of automobile, disappears to save fuel oil
Consumption drives prompt system using ecology is installed on automobile, and existing ecology drives prompt system and utilizes OBD onboard diagnostics system
System, GPS, electronic map and other sensors etc. obtain the information such as vehicle operation data and environment, by calculating, pass through language
Sound module, vision module or tactile module convey the prompt informations such as gear, speed, acceleration, idling to driver, it is proposed that drive
The person of sailing is driven in more fuel-efficient mode.Such as: a kind of base is disclosed in the document that China Patent Publication No. is CN104175875B
In the shift suggestion device and its control method of vehicle-mounted self-diagnosis system OBD, including vehicle-mounted cigarette lighter, GPS antenna, power supply mould
Block, GPS module, EEPROM, single-chip microcontroller, ELM327, car OBD interface, LCD display, wherein OBD is for obtaining speed, hair
The data such as motivation revolving speed, accelerator open degree, engine load rate, GPS is for obtaining the data such as speed, time, and single-chip microcontroller is according to obtaining
The data taken obtain road resistance coefficient and driver intention coefficient, and comprehensive road resistance coefficient and driver intention coefficient obtain
To comprehensive sexual factor, with the difference of power shifting speed and economic shift speed multiplied by comprehensive sexual factor, along with economic shift
Speed judges to best gear and makes prompt as new shift speed, and in economy shift operating condition and power shifting
Shifting points are modified under operating condition, keep shifting points more accurate, but this shift suggestion device is merely able to make shifting points
It is preferable to prompt, but prompt cannot be made for anxious acceleration, anxious this high oil consumption behavior of slowing down, it is oily to limit further saving
Consumption.
Currently, some energy-saving driving prompt systems also have the function of being prompted acceleration vehicle, but accelerate
Degree limit value is certain value, cannot be modified according to vehicle running environment dynamic, when the good time limit value of running environment can seem excessive, no
Good action can be played, when running environment is poor, limit value can seem too small again, do not have the effect of fuel-economizing not only, connect instead
Continuous prompt also will affect driver's driving experience, and this system is to make mentioning to driver according to fixed time interval
Show do not have prompt interval regulatory function, and the receptible prompt interval of each driver is different, this also affects use
Family experience.
Summary of the invention
The purpose of the present invention is to solve existing automobile energy-saving drive prompt there are the problem of, propose it is a kind of ecology drive
Reminding method according to vehicle running environment situation dynamic adjustment acceleration limit value and can adjust prompt interval, run in high oil consumption
Prompt is made when environment, further saves oil consumption.
It is proposed by the present invention it is a kind of ecology drive reminding method the technical solution adopted is that: by ECU obtain vehicle it is instantaneous
Speed v, accelerator open degree θ, engine speed ne, acceleration a and substantially shift gears point data, comprising the following steps:
Step 1:ECU handles data, obtains automobile current shift I, accelerator open degree change rate k, automotive average vehicle
Fast V and speed fluctuating range Δ V；
Step 2:ECU calculates average speed V and speed fluctuating range Δ V according to fuzzy algorithmic approach, obtains dynamic and adds
Speed limit a '；
Step 3:ECU compares acceleration a and the size of acceleration limit value a ' goes to step 4 as a > a '；As a≤a '
When, then it is current for ecological driving condition；
Step 4:ECU obtains the time prompting interval that ecology drives through man-machine interaction device；
Step 5:ECU judges whether to drive standby signal to voice prompting device and visual cues device output ecology.
Further, while step 2 to step 5, ECU first judges shift mode according to acceleration a, then obtains best
Then shifting points obtain best gear i according to best shifting points, finally carry out the current shift I and best gear i
Compare, if I ≠ i, obtain shift prompt time prompting interval, according to shift prompt time prompting interval judge whether to
Voice prompting device and visual cues device output shift standby signal.
Further, when ecology drives standby signal and shift standby signal prompts simultaneously, shift standby signal is excellent
First.
The technical effect that the present invention has are as follows:
1. demand of the present invention according to acceleration and accelerator open degree change rate identification driver to dynamic property, in conjunction with automobile
Power shifting point and economic shift point data, obtain best shifting points, and obtain best gear and be prompted to driver, to help
Driver is helped rationally to shift gears.Both it ensure that demand of the driver to dynamic property, and also improved economy.With balance driver couple
The shift prompt facility of dynamic property and economy demand also there is ecology to drive prompt facility.
2. the present invention can according to automobilism environmental aspect dynamic adjustment acceleration limit value, using based on average speed and
The fuzzy algorithmic approach dynamic modification acceleration limit value of speed amplitude of variation.Apply biggish acceleration limit when running environment is preferable
System, applies lesser constraint when running environment is poor, to reach better oil-saving effect, keeps the drive manner of driver more raw
State.
3. HMI man-machine interaction device provided by the invention, driver can adjust the interval of prompt according to own situation, allow and drive
The person of sailing adjusts the prompt interval of voice prompting device and visual cues device, provides better user experience.
Detailed description of the invention
Fig. 1 is that a kind of ecology of the present invention drives the structural block diagram that the ecology that reminding method uses drives suggestion device；
Fig. 2 is the flow chart that a kind of ecology of the present invention drives reminding method.
Specific embodiment
The present invention is to drive suggestion device based on ecology shown in FIG. 1 to be carried out, and ecology drives suggestion device by CAN
Analyzer 1, basic shifting points memory 2, acceleration transducer 3, HMI man-machine interaction device 4, integrated shift prompt and ecology drive
The ECU (hereinafter referred to as ECU) 5, voice prompting device 6 and visual cues device 7 of algorithm is prompted to form.
Wherein, CAN analyzer 1 uses commercially available II CAN analyzer of CANalyst-, and there are two port, one end passes through and whole
The onboard diagnostic system of vehicle is connected, and a variety of data can be obtained from vehicle CAN bus, and the other end passes through RS232 serial ports and ECU 5 pairs
To communication, the data that will acquire are sent to ECU 5.CAN analyzer 1 can obtain vehicle disclosed in vehicle factor from CAN bus
Operation data, in the present invention, CAN analyzer 1 acquisition speed v, accelerator open degree θ and engine speed neThree parameters.Base
This shifting points memory 2 selects eeprom chip and 5 one-way communication of ECU, has automobile power shifting points and economic shifting points
Data, power shifting point and economic shifting points are referred to as basic shifting points.The output end connection ECU's 5 of acceleration transducer 3
Input terminal, acceleration transducer 3 obtain pickup a in real time and are output to ECU 5, and acceleration transducer 3 selects included conditioning
The triaxial acceleration module ADXL335 of circuit, output digit signals, is directly welded on ECU 5, and ECU 5 is real-time from pin
Obtain acceleration information.HMI man-machine interaction device 4 is connected by data line with ECU 5, and driver passes through rotation HMI human-computer interaction
The knob of device 4 adjusts output electric current, and ECU 5 judges to prompt interval desired by driver according to the size of electric current, when a current is large,
The desired prompt interval of driver is small, and when electric current is small, the desired prompt interval of driver is big.5 pairs of ECU acquisition data into
Row processing, output shift prompt information and ecology drive prompt information, these prompt informations include speech prompt information and vision
Prompt information.The output end of ECU 5 is separately connected voice prompting device 6 and visual cues device 7, and voice prompting device 6 receives ECU's 5
Speech prompt information prompts driver's shift and ecology to drive, and voice prompting device 6 uses SYN6288TTS voice module, it is logical
It crosses UART asynchronous serial communication interface and ECU 5 is communicated.Visual cues device 7 receives the visual cues information of ECU 5, and display is current
Gear and best gear, and prompt driver's ecology drive, and visual cues device 7 uses USART serial ports screen, it passes through RS232
Serial ports and ECU 5 are communicated.
As shown in Fig. 2, a kind of ecology of the present invention drives reminding method, specific step is as follows:
Step 1:CAN analyzer 1 obtains vehicle automobile's instant velocity v, accelerator open degree θ and engine speed ne, CAN and by this
A little data are input in ECU5；Acceleration transducer 3 obtains acceleration a and is output to ECU 5 by pin；ECU 5 is by drawing
Foot obtains the basic shifting points of automobile from basic shifting points memory 2, wherein basic shifting points have been obtained by calculation simultaneously in advance
And it is stored in this shifting points memory 2.
Shifting points are divided into power shifting point, economic shifting points and comprehensive shifting points again.And every kind of shifting points are to go out in pairs
Existing, it include upshift shifting points and downshift shifting points, in order to avoid shift circulation, at same accelerator open degree θ, general downshift is changed
Catch point speed is 2-8km/h smaller than upshift shifting points speed, different according to each vehicle and service condition etc..
Power shifting point is to instigate the available shifting points played to greatest extent of the power performance of automobile, i.e., in vehicle
The maximum gear of acceleration is selected under current throttle and speed.It shifts gears by this method, then the accelerated energy of automobile is always maintained at
It is maximum.Power shifting point is generally based on engine static test data and is calculated.
According to automobile dynamics equation, for a certain accelerator open degree θ, the acceleration of automobile when speed changer n is kept off are as follows:
Similarly, speed changer is the acceleration of automobile when n+1 is kept off are as follows:
In formula, TtqFor engine torque, inFor the transmission ratio of speed changer n gear, in+1For speed changer n+1 gear transmission ratio,
i0For main reducing gear reduction ratio, ηTFor efficiency, G is the product of car mass and acceleration of gravity, and f is rolling resistance, and i is road surface
The gradient, CDFor coefficient of air resistance, A is front face area of automobile, δnFor the correction coefficient of rotating mass of n gear, δn+1For the rotation of n+1 gear
Pignus pignoris amount conversion coefficient.
It can be fitted to obtain engine torque T at accelerator open degree θtqWith engine speed neEquation:
In formula: e0,e1,e2For fitting coefficient, neFor engine speed.
Engine speed n againeMeet following relational expressions with the relationship of speed v,
In formula: r is radius of wheel.
Then, formula (3), (4) are substituted into formula (1) and (2), enabled:
Can solve to obtain speed v, i.e., in accelerator open degree θ and speed v, n gear it is identical with the acceleration that n+1 is kept off, i.e. θ with
Speed v is the power shifting point that n gear rises n+1 gear.Then take accelerator open degree θ from 0-100%, gear is gone forward side by side from a gear to top gear
The above-mentioned operation of row, can solve to obtain from low gear and be raised to the accelerator open degree θ and speed v of adjacent high gear to get to power shifting
Point data.
Economic shifting points, refer to makes automobile with fuel consumption traveling few as far as possible under conditions of guaranteeing dynamic property
Shifting points, evaluation index are oil consumption per hour.It shifts gears by this method, the fuel consumption per hour of automobile is minimum.Economic shifting points
Engine static test data are generally based on to be calculated.
According to automobile theory, an accelerator open degree θ, when n is kept off, the engine fuel consumption data that can be obtained according to test is quasi-
Conjunction obtains engine oil consumption characteristic Q hourlynWith engine speed neEquation:
In formula: A1,B1,C1For fitting coefficient.
Similarly, fuel consumption Q when available accelerator open degree θ, n+1 are kept offn+1Fit equation:
In formula: A2,B2,C2For fitting coefficient.
Formula (4) are substituted into formula (6), (7), are enabled:
Qn=Qn+1 (8)
It can solve to obtain speed v, i.e., in accelerator open degree θ and speed v, n keeps off, i.e. θ and vehicle identical with the oil consumption that n+1 is kept off
Fast v is the economic shifting points that n gear rises n+1 gear.Then take accelerator open degree θ from 0-100%, gear is carried out from a gear to top gear
Above-mentioned operation, can solve to obtain from low gear and be raised to the accelerator open degree θ and speed v of adjacent high gear to get to economic shifting points
Data.
Comprehensive shifting points refer to both in view of dynamic property also allows for the shifting points of economy, are anticipated in real time according to driver
Figure and road conditions balance between dynamic property and economy, and it is comprehensive that ECU 5 can call basic shifting points to be calculated in real time
Close shifting points.Shifting points determine that automobile is advanced with higher dynamic property, or with the advance of preferable fuel economy.Certain
Driving conditions under, the transmission ratio of speed changer is smaller, and gear value is higher, and the fuel economy of automobile is better, the economic row of automobile
It sails all in high gear.Therefore, periodically, the shift speed under economic model is lower for accelerator open degree one, and automobile is enable to rise up into as soon as possible
High gear.But gear is higher, transmission ratio is smaller, and the torque of transmission output shaft is lower, suddenly accelerates or climbs in needs
When be possible to the situation for torque deficiency occur, need at this time lower gear travel.In this case, when accelerator open degree one
Fixed, shift speed is higher, travels automobile in lower gear, improves dynamic property.
The data that the processing of step 2:ECU 5 is got, it is flat to obtain automobile current shift I, accelerator open degree change rate k, automobile
Equal vehicle velocity V and speed fluctuating range Δ V.
In manual gear vehicle, current shift I can be obtained by way of calculating.Specifically, turning first with engine
Fast neIt is calculate by the following formula to obtain theoretical transmission ratio I with speed vg,
Then ECU 5 by transmission ratio Ig respectively with each gear transmission ratio i of speed changernMake difference and take absolute value, takes most
The corresponding gear of small absolute value is as current shift I, each gear transmission ratio i of speed changernIt is pre-filled in ECU 5:
I=min | Ig-in|} (10)
In formula: 1≤n≤nmax, nmaxFor the gear number of speed changer.
Such as: a kind of vehicle of 6 gear manual gears, it is known that the transmission ratio i of actual each gear of speed changernSuch as following table
Shown in 1, if the I being calculated by formula (9)gIt is 0.82, the absolute value of the difference by comparing to obtain 0.82 and 0.794
Minimum, then gear I at this time is 0.794, and corresponding is 6 gears.
Table 1
| Gear value | inValue |
| 1 | 5.441 |
| 2 | 2.839 |
| 3 | 1.721 |
| 4 | 1.223 |
| 5 | 1 |
| 6 | 0.794 |
Accelerator open degree change rate k indicates that driver steps on the throttle the urgent degree of pedal, has reacted driver to dynamic property
Demand, demand of the bigger driver of aperture change rate to dynamic property is higher, obtains throttle to the derivation of time t by accelerator open degree θ
Aperture change rate:
Average speed V is the ratio of most nearby two minutes automobile forward travel distance S and time (120s), speed fluctuating range Δ
V is the maximum value V of speed in most nearby two minutesmaxWith minimum value VminDifference.Record most nearby two minutes in real time ECU 5
Vehicle speed data first integrates automobile's instant velocity v, obtains two minutes distance S to advance, and obtain the max speed by comparing
VmaxWith minimum vehicle velocity Vmin, then average speed V and speed fluctuating range Δ V is calculated in (11), (12) formula according to the following formula；
Δ V=Vmax-Vmin。 (12)
Step 3:ECU 5 judges shift mode according to acceleration a.Not according to driver's driving style and road conditions
Together, in driving procedure, demand of the driver to vehicle dynamic quality and fuel economy is changing always.Driver is sometime
Best fuel economy may be pursued, it is also possible to pursue best dynamic property, it is also possible to all to fuel economy and dynamic property
There is certain demand.Therefore the present invention provides power shifting mode, economic shift mode and comprehensive shift modes drives to meet
The demand for the person of sailing, and which kind of mode is judged as according to acceleration a.
When acceleration a is less than predetermined minimum a1When, the acceleration of operator demand is very low, is judged as economic shift mould
Formula；When acceleration a is greater than preset maximum value a2When, the acceleration of operator demand is very high, is judged as power shifting mode；When adding
Speed a is equal to a1、a2Or it is in a1And a2Between when, driver has certain demand to dynamic property and economy, is judged as comprehensive
Close shift mode.a1And a2It is determined according to practical effect, the present invention takes a1=0.5m/s2, a2=2m/s2。
Step 4:ECU 5 determines best shift according to the determining shift mode of step 3 and accelerator open degree θ, speed v
Point, with the best gear of determination.
In economic shift mode, the economic shifting points that ECU 5 is obtained from basic shifting points memory 2 are as best shift
Point, accelerator open degree is θ at this time and economic shift speed is vj；
In power shifting mode, ECU 5 obtains power shifting point as best shift from basic shifting points memory 2
Point, accelerator open degree is θ at this time and power shifting speed is vd；
In comprehensive shift mode, ECU 5 obtains power shifting point and economic shifting points from basic shifting points memory 2,
And use accelerator open degree change rate k as the parameter for coordinating dynamic property and economy.It is driven because accelerator open degree change rate k is illustrated
The person of sailing steps on the throttle the urgent degree of pedal, has reacted demand of the driver to dynamic property.To a certain accelerator open degree θ, synthesis is changed
Keep off a car fast vzIt is shown below:
Then correspond to different accelerator open degree θ, (14) obtain the speed v that most preferably shifts gears according to the following formulabest,
The then best shifting points under available different shift modes.
Step 5: according to current throttle aperture θ and speed v, comparing the best shift point data that step (4) obtain, obtain most
Good gear i.For example, when accelerator open degree θ is greater than the aperture θ that 2 gears rise 3 gears2-3, i.e. θ > θ2-3, speed v, which is greater than 2 gears and rises 3, to keep off a car speed
v2-3, i.e. v > v2-3, and θ < θ3-4, v < v3-4, speed and accelerator open degree at this time meets 2 gears and rises the condition of 3 gears, and is unsatisfactory for 3 gears
The condition of 4 gears is risen, then best gear should be 3 gears.Other accelerator open degrees and speed and so on.
Step 6:ECU 5 judges whether current shift is best.
The best gear i that ECU 5 obtains current shift I and step 5 that step 2 obtains is compared, if current shift I
It is not best gear i, i.e. I ≠ i then goes to step 7；If I=i stops.
Step 7:ECU 5 obtains prompt interval T.On the run, driver rotates the man-machine friendship of HMI according to oneself demand
The knob of mutual device 4, to change the electric current that man-machine interaction device 4 is exported to ECU 5, ECU 5 determines outlet chamber according to size of current
Every.Electric current is bigger, prompts to be spaced smaller, minimum 1/3min；Electric current is smaller, prompts interval bigger, is up to 1min.ECU 5
Prompt interval T (min/ times) is obtained according to following formula:
In formula: A is the electric current that man-machine interaction device 4 is output to ECU 5；AminFor minimum current；AmaxFor maximum current.Its
In, minimum current and maximum current are obtained by test.
Step 8:ECU 5 is spaced T according to prompt, judges whether to mention to voice prompting device 6 and the output shift of visual cues device 7
Show signal.The judgement whether prompted is realized by the clocking capability that ECU 5 is carried.ECU 5 often makes primary shift prompt,
Included clocking capability all restarts timing, so the result of timing is the time interval prompted apart from last time.When running to
When step 8, by the result T of shift prompt timing1Compared with being spaced T-phase with prompt, if T1>=T, then ECU 5 will export standby signal
It to voice prompting device 6 and visual cues device 7, goes to step (9), shift prompt timing is reset, and restarts timing；Otherwise, T1
< T, ECU 5 does not export standby signal, continues timing, and waiting judges next time.
Step 9:ECU 5 exports shift standby signal to voice prompting device 6 and visual cues device 7, voice prompting device 6 and view
Feel that prompting device 7 makes shift prompt.The content of prompt be step 5 as a result, i.e. prompt driver change to step 5 obtain it is best
Gear i, specific suggestion content are as follows: " i gear please be change to ".ECU 5 persistently carries out best gear judgement, only according to the tune of driver
Section prompts primary, such realization shift prompt facility according to nearest result at regular intervals.
Step 10: while step 3 to step 6 is implemented, average vehicle that ECU 5 obtains step 2 according to fuzzy algorithmic approach
Fast V and speed fluctuating range Δ V are calculated, and dynamic acceleration limit value a ' is obtained.It is defeated that fuzzy algorithmic approach sets two inputs one
Out, it inputs as average speed V and speed fluctuating range Δ V, exports as acceleration limit value a '.Average speed V and velocity perturbation width
Degree Δ V reflects road conditions, when V is larger and Δ V is smaller, illustrates that road conditions are good, driver can compare calm driving, at this time
Acceleration limit value is smaller, i.e., applies biggish limitation to acceleration, drive driver more stably, with more savings combustion
Oil realizes the purpose that ecology drives；When V is smaller and Δ V is larger, illustrate that road conditions are poor, automobile, which needs often to change speed, to be come
Changeable traffic condition is adapted to, the acceleration of automobile is generally large, and the limit value of acceleration is larger in this case, i.e., to acceleration
Apply lesser limitation, enables the driving that driver is more calm.Fuzzy algorithmic approach is formulated accordingly, and average speed V and speed are fluctuated
Amplitude, ao V as input, by average speed be divided into L (low), M (in), H (height) three-level, speed fluctuating range Δ V is also drawn
Be divided into L (low), M (in), H (height) three-level, obtain 9 fuzzy rules, judge running environment before this accordingly.Fuzzy rule root
Different acceleration limit value a ' is obtained according to different average speed V and speed fluctuating range Δ V, as judging whether driver gives birth to
State drive foundation, output result be S (small), M (in), B (big).Fuzzy reasoning table is as shown in table 2 below,
2 fuzzy reasoning table of table
When V is L and Δ V is H, acceleration limit value is B；When V is H and Δ V is L, acceleration limit value is S；Other shapes
Condition, when V is L and Δ V is L, acceleration limit value is M；When V is L and Δ V is M, acceleration limit value is M；When V is M and Δ V is L
When, acceleration limit value is S；When V is M and Δ V is M, acceleration limit value is M；When V is M and Δ V is H, acceleration limit value is
B；When V is H and Δ V is M, acceleration limit value is S；When V is H and Δ V is H, acceleration limit value is S.Specific V and Δ V
Numerical value three-level divide and acceleration limit value a ' determination it is different according to the difference of vehicle, need to according to using effect lead to
Overtesting is formulated；
Step 11:ECU 5 compares current acceleration a and acceleration limit value a ', judges whether current acceleration exceeds acceleration
Spend limit value.As a > a ', step 12 is gone to；As a≤a ', illustrating driver currently is ecological driving condition, then stops.
Step 12:ECU 5 obtains prompt interval T.Prompt interval is shift prompt facility, prompts interval T, i.e. step 7
In shift prompt and ecology drive prompt prompt interval be identical.
Step 13:ECU 5 judges whether that ecology is exported to voice prompting device 6 and visual cues device 7 drives standby signal.It needs
It is noted that shift prompt and ecology drive prompt prompt interval be identical, be T, still, shift prompt facility and
Ecology drives prompt facility and distinguishes timing, and the result of timing is T1And T2.ECU 5 often makes primary ecology and drives prompt, included
Clocking capability all restarts timing, so the result of timing is to drive the time interval of prompt apart from last time ecology.By timing
Result T2Compared with T-phase, if T2>=T, then ECU 5 will export standby signal to voice prompting device 6 and visual cues device 7, go to
Step 14, and restart timing；Otherwise, T2< T, ECU 5 does not export standby signal, and timing continues；
Step 14:ECU 5 exports ecology and drives standby signal to voice prompting device 6 and visual cues device 7, voice prompting device
6 and visual cues device 7 receive and make ecology after standby signal and drive prompt.Specific suggestion content are as follows: " asking ecological driving ". ECU
5 are persistently made whether the judgement of ecology driving, only according to the adjusting of driver, are prompted at regular intervals according to nearest result
Once, so realize that ecology drives prompt facility.
When ecology drives prompt facility and prompt facility of shifting gears is needed while being prompted, shift prompt is preferential, when completion is changed
After gear prompt, then carries out ecology and drive prompt.
Claims (9)
1. a kind of ecology drives reminding method, vehicle automobile's instant velocity v, accelerator open degree θ, engine speed n are obtained by ECUePlus
Speed a and basic shift point data, it is characterized in that the following steps are included:
Step 1:ECU handles data, obtain automobile current shift I, accelerator open degree change rate k, automotive average vehicle velocity V and
Speed fluctuating range Δ V；
Step 2:ECU calculates average speed V and speed fluctuating range Δ V according to fuzzy algorithmic approach, obtains dynamic acceleration
Limit value a '；
Step 3:ECU compares acceleration a and the size of acceleration limit value a ' goes to step 4 as a > a '；As a≤a ', then
Current is ecological driving condition；
Step 4:ECU obtains the time prompting interval that ecology drives through man-machine interaction device；
Step 5:ECU judges whether to drive standby signal to voice prompting device and visual cues device output ecology.
2. a kind of ecology according to claim 1 drives reminding method, it is characterized in that: while step 2 to step 5,
ECU first judges shift mode according to acceleration a, then obtains best shifting points, then obtains best gear according to best shifting points
The current shift I and best gear i are finally compared by i, if I ≠ i, between the time prompting for obtaining shift prompt
Every judging whether to shift gears to voice prompting device and the output of visual cues device according to the time prompting interval for prompt of shifting gears prompts to believe
Number.
3. a kind of ecology according to claim 2 drives reminding method, it is characterized in that: when ecology drives standby signal and changes
When gear standby signal prompts simultaneously, shift standby signal is preferential.
4. a kind of ecology according to claim 2 drives reminding method, it is characterized in that: current shift I=min | Ig-in
|, 1≤n≤nmax, IgIt is theoretical transmission ratio, inIt is each gear transmission ratio of speed changer, 1≤n≤nmax, nmaxTo become
The gear number of fast device.
5. a kind of ecology according to claim 2 drives reminding method, it is characterized in that: ECU judges to shift gears according to acceleration a
When mode, when acceleration a is less than predetermined minimum a1When, it is judged as economic shift mode；When acceleration a is greater than preset maximum value
a2When, it is judged as power shifting mode；When acceleration a is equal to a1、a2Or it is in a1And a2Between when, be judged as comprehensive shift mould
Formula.
6. a kind of ecology according to claim 5 drives reminding method, it is characterized in that: in economic shift mode, throttle
Aperture is θ and economic shift speed is vj；In power shifting mode, accelerator open degree is θ and power shifting speed is vd；Comprehensive
When closing shift mode, accelerator open degree is θ and comprehensive shift speedIt obtains under different shift modes
Best shifting points.
7. a kind of ecology according to claim 6 drives reminding method, it is characterized in that: according to accelerator open degree θ and speed v,
Best shifting points are compared, best gear i is obtained.
8. a kind of ecology according to claim 1 drives reminding method, it is characterized in that: ECU is according to man-machine friendship in step 4
The electric current A of mutual device obtains the time prompting interval of ecology drivingAminFor the minimum of man-machine interaction device
Electric current；AmaxFor the maximum current of man-machine interaction device.
9. a kind of ecology according to claim 1 drives reminding method, it is characterized in that: in step 2, the fuzzy algorithmic approach
It is an output that average speed V and speed fluctuating range Δ V, which are set, as two inputs, acceleration limit value a ', and average speed V is drawn
It is divided into basic, normal, high three-level, speed fluctuating range Δ V is also divided into basic, normal, high three-level, 9 fuzzy rules are obtained, according to mould
Paste rule obtains different acceleration limit value a '.
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