CN106926699A - The control display methods and its control system of Digital Automobile combination instrument - Google Patents
The control display methods and its control system of Digital Automobile combination instrument Download PDFInfo
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- CN106926699A CN106926699A CN201710209083.9A CN201710209083A CN106926699A CN 106926699 A CN106926699 A CN 106926699A CN 201710209083 A CN201710209083 A CN 201710209083A CN 106926699 A CN106926699 A CN 106926699A
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- 238000004364 calculation method Methods 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
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- 230000002452 interceptive effect Effects 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 6
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- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 claims description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Arrangement of adaptations of instruments
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- B60K35/29—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- B60K2360/18—
Abstract
The invention discloses the control display methods and its control system of a kind of Digital Automobile combination instrument, comprise the following steps：S1, by CAN obtain motor speed signal and gear signal；S2, analytical Calculation is carried out to the motor speed signal and gear signal that are obtained by Meter Control Unit at least obtain speed information；S3, the speed information obtained after display unit is by parsing are shown；S4, the speed information after parsing is sent to CAN, each control node for CAN is extracted；The motor speed signal and gear signal of bus transfer are carried out into calculating by Meter Control Unit process to obtain speed information, vehicle speed sensor can be given up or be used in combination with vehicle speed sensor, it is to avoid vehicle speed sensor breaks down the potential risk brought；And the control unit of combination instrument can be used as processing unit and the sending node that can be sent out as speed information, change framework of the speed in vehicle network so that control, display and the transmission more intelligence of speed information are effectively.
Description
Technical field
The present invention relates to automobile instrument technical field, more particularly to a kind of control display side of Digital Automobile combination instrument
Method and its control system.
Background technology
Automobile instrument device is the presentation of information center of automotive service state, is that driver carries out information exchange with automobile
Platform, is also one of kernel component of guarantee vehicle safety.In automobile instrument, speedometer is used to indicate vehicle
Travel speed, is must equipping for vehicle.For instrument developer, the speedometer of design must assure that operate steadily it is suitable
It is sliding, indicate promptly and accurately, and mileometer then must indicate it is accurate and reliable.With growing, the various electricity of automotive engineering
Sub- sensor, electronic control module are widely used in a variety of applications on vehicle, and the form of GES is also driven by simple mechanical flexible axle
Dynamic formula evolves as general PWM electronic signals and has the bus signals of fixed communication agreement.While the electromagnetic environment on vehicle
Also become increasingly complex, the exploitation of the variation of signal form and the electromagnetic environment of complexity to automotive speedometer proposes higher wanting
Ask, speedometer there must be the ability of more perfect Signal acquiring and processing.
For GES, in general method, vehicle speed data transmitting element can be entire car controller, abs controller,
The control unit of the detectable speed such as Tachographs, the collection of its speed all uses vehicle speed sensor, and recipient is usually to make
For the instrument of display unit or other need the control unit of speed.That is the collection of speed is all to use vehicle speed sensor, warp
Output is to entire car controller after crossing collecting unit treatment, and entire car controller to calculate that be sent to CAN after the information such as speed, rotating speed total
Line, combination instrument receives the information in bus, obtains the data such as speed, rotating speed, draws mileage by computing, then motor
And LCD display, display speed, rotating speed and mileage information, now, the sender of GES is vehicle speed sensor and vehicle control
Device processed, combination instrument is only as the recipient of information.The control strategy one of this dependence vehicle speed sensor is fragile comparing, once
Vehicle speed sensor or wheel speed sensors are broken down, and GES can be caused to obtain, and necessarily bring many potential wind
Danger；Two are, the intelligence degree of combination instrument is relatively low, it is impossible to share the operation of entire car controller and bus control unit.
Accordingly, it would be desirable to existing automobile instrument control display methods is improved, it is non-to be passed by existing speed merely
Sensor carries out Bus- Speed Monitoring, reliability is higher, it is to avoid vehicle speed sensor breaks down the potential risk brought.
The content of the invention
In view of this, the present invention provides a kind of the control display methods and its control system of automobile digitalization instrument, and it can
Speed parsing is carried out by bus message, can not merely rely on vehicle speed sensor, it is to avoid vehicle speed sensor outlet failure is brought
Potential risk.
The control display methods of Digital Automobile combination instrument of the invention, comprises the following steps：
S1, by CAN obtain motor speed signal and gear signal；
S2, analytical Calculation is carried out by Meter Control Unit to the motor speed signal and gear signal that are obtained at least
To speed information；
S3, the speed information obtained after display unit is by parsing are shown；
S4, the speed information after parsing is sent to CAN, each control node for CAN is extracted.
Further, also include in step 4：Speed information after treatment is simulated and is sent, it is total that steam supply Chefei accesses CAN
The control unit of line is used.
Further, speed is theoretical speed in step S2, and the calculation of theoretical speed is：
V=0.377 × R × n/ (io×ii)；
Wherein, v is speed, and unit is Km/h；
R is radius of wheel, and unit is m, and for same car, its value is fixed；
N is motor speed, and unit is r/min；
ioIt is main step-down ratio, its value is fixed；
iiIt is transmission ratio, its value is fixed.
Further, speed is actual vehicle speed in step S2, and the calculation of actual vehicle speed is：
V=0.377fa×R×n/(io×ii)+fb；
Wherein, v is speed, and unit is Km/h；
R is radius of wheel, and unit is m, and for same car, its value is fixed；
N is motor speed, and unit is r/min；
ioIt is main step-down ratio, its value is fixed；
iiIt is transmission ratio, its value is fixed；
fa、fbIt is speed correction factor and error correction values.
Further, the speed information after parsing is sent to CAN in step S4, for each control node of CAN
The step of extraction, includes：Meter Control Unit will calculate the vehicle speed value for completing and be sent to bus control unit, by bus marco
Bus transceiver is sent to after cell processing in the way of binary code stream, is sent into CAN after being converted to bus signals.
Further, the speed information after treatment is simulated in step S4 and is sent, steam supply Chefei accesses the control of CAN
The step of unit processed is used includes：
Speed information is converted to pwm signal by Meter Control Unit, the frequency f according to receiving uniti, define the speed of instrument
Than K, K=a/fi
Corresponding pwm signal transmission frequency f, f=v × K/3600 are calculated according to real-time speed information, and is simulated
Send；
Wherein, K is instrument speed ratio；
fiIt is the frequency of speed receiving unit, unit Hz；
A is the umber of pulse in each cycle, is herein pwm signal, and a is 1；
F is to be simulated the PWM signal frequency for sending, unit Hz；
The real-time speed that v is calculated for instrument, unit K m/h.
The invention also discloses a kind of for realizing that the control system of the control display methods of automobile digitalization instrument includes：
Motor speed collector, for gathering motor speed signal；
Gear signal collector, the gear signal for gathering automobile；
Bus control unit, motor speed signal and gear signal, motor speed collector and gear are received by bus
The signal output part of signal picker is connected with bus control unit；
Meter Control Unit, for receiving motor speed signal and gear signal that bus control unit obtained and carrying out
Analytical Calculation, obtains vehicle speed mileage information, and Meter Control Unit forms interactive connection with bus control unit；
Display unit, is connected with the output end of Meter Control Unit
Further, Meter Control Unit includes：
Data processing unit, for obtaining speed information to motor speed signal and gear signal analytical Calculation, and is used for
Simulation sends data operation；
Bus interactive unit, interconnects, with bus control unit for receiving the collection that bus control unit is transmitted
The speed information obtained through data processing unit is simultaneously fed back to bus interactive unit by signal；
Simulation transmitting element, the control unit signal for accessing CAN non-with automobile is connected to be sent to automobile speed
Information；
Data processing unit is connected with bus interactive unit and the simulation equal signal of transmitting element.
Beneficial effects of the present invention：The control display methods and control system of automobile digitalization instrument of the invention, by instrument
Table control unit and bus message carry out serial communication, by Meter Control Unit by the motor speed signal and shelves of bus transfer
Position signal carries out calculating treatment and obtains speed information, can give up vehicle speed sensor or is used in combination with vehicle speed sensor, it is to avoid speed
The potential risk that sensor failure brings；And the control unit of combination instrument can be used as processing unit and can conduct
The sending node that speed information is sent out, changes framework of the speed in vehicle network, forms the intelligent portion of operation independent
Point, for automobile combination meter device provides a kind of new design so that control, display and the transmission of speed information are more
Intelligence is effectively.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the schematic flow sheet of the control display methods in the present invention；
Fig. 2 is the FB(flow block) of the control system in the present invention.
Specific embodiment
Fig. 1 is the schematic flow sheet of the control display methods in the present invention, and Fig. 2 is the flow of the control system in the present invention
Block diagram, as shown in the figure：The control display methods of the Digital Automobile combination instrument of the invention of the present embodiment, including following step
Suddenly：
S1, motor tach signal and gear signal that electric automobile is obtained by CAN；
S2, analytical Calculation is carried out by Meter Control Unit to the motor speed signal and gear signal that are obtained at least
To speed information；Wherein, Meter Control Unit is carried out after the next motor speed signal of bus transfer and gear signal is derived from
Inter-process is calculated, and is computed that the transport condition parameters such as vehicle speed value, mileage value and tachometer value can be obtained；
S3, the speed information obtained after display unit is by parsing are shown；Display unit is instrument board, is passed through
LCD display is shown；
S4, the speed information after parsing is sent to CAN, each control node for CAN is extracted；Step 3 and
Step 4 is the step of being completely independent, and individually can be carried out respectively, can also be carried out simultaneously, and step 4 is again by Meter Control Unit
Realize, the vehicle speed value and mileage information obtained after Meter Control Unit is by parsing are fed back in bus, in bus network
Other control nodes (such as entire car controller, ABS) extract.
In the present embodiment, also include in step 4：Speed information after treatment is simulated and is sent, steam supply Chefei accesses
The control unit of CAN is used.Such as EPS (electronic power assist steering), when it is not included in vehicle CAN network framework,
It can not access CAN, need to obtain GES by analog signal.I.e. step 4 is divided into carry out speed information transmission
CAN is sent and simulation sends two modules, and the two forwarding steps can be carried out simultaneously, and can also stagger the time respectively is carried out.This reality
Apply in example, speed is theoretical speed in step S2, the calculation of theoretical speed is：
V=0.377 × R × n/ (io×ii)；
Wherein, v is speed, and unit is Km/h；
R is radius of wheel, and unit is m, and for same car, its value is fixed；
N is motor speed, and unit is r/min；
ioIt is main step-down ratio, its value is fixed；
iiIt is transmission ratio, its value is fixed.
In the present embodiment, for an automobile, its radius of wheel R is known, the gearratio i of main reducing gearoAnd
The gearratio i of the speed changer corresponding to each geariIt is to determine, these numerical value can set in instrument program, when knowing
When road gear signal, corresponding gearratio is also known that, so, when Meter Control Unit obtains motor by bus
After rotating speed and gear signal, you can calculate theoretical speed according to above-mentioned formula.
In the present embodiment, speed is actual vehicle speed in step S2, and the calculation of actual vehicle speed is：
V=0.377fa×R×n/(io×ii)+fb；
Wherein, v is speed, and unit is Km/h；
R is radius of wheel, and unit is m, and for same car, its value is fixed；
N is motor speed, and unit is r/min；
ioIt is main step-down ratio, its value is fixed；
iiIt is transmission ratio, its value is fixed；
fa、fbIt is speed correction factor and error correction values.
In normal vehicle operation, tire periphery is not preferable circle, there is certain rich bent deformation, and main deceleration
The transmission efficiency of device, speed changer etc. is not up to 100% so that actual vehicle speed is simultaneously not equal to theoretical speed, therefore, the meter of actual vehicle speed
Calculation will be deformed on the basis of theoretical speed, increase speed amendment, fa、fbIt is speed correction factor and error correction values, its
Value can be obtained in the later stage by testing, and be written in the program of combination instrument afterwards.During experiment, in different speed sections, such as 0~
60Km/h, 60~100Km/h, 100~140Km/h etc., an actual vehicle speed V is measured using GPS test car speed systemsa, while
Read the actual vehicle speed V in vehicle CAN busb, by VaAnd VbContrasted, determined the speed correction factor under different speed sections
faWith error correction values fbSo that Vb=Va。
In the present embodiment, the speed information after parsing is sent to CAN in step S4, for each control of CAN
The step of Node extraction, includes：Meter Control Unit will calculate the vehicle speed value for completing and be sent to bus control unit, by bus
Bus transceiver is sent in the way of binary code stream after control unit treatment, sends total to CAN after being converted to bus signals
In line；I.e. when CAN transmission is carried out, Meter Control Unit will calculate the vehicle speed value for completing and be sent to bus control unit,
Bus control unit generation CAN frames go forward side by side line position filling, addition CRC check, response detection etc. operation after with binary code stream
Mode is sent on bus transceiver, is sent in bus after being converted to bus signals.
The speed information after treatment is simulated in the present embodiment, in step S4 is sent, steam supply Chefei accesses CAN
Control unit include the step of use：
Speed information is converted to pwm signal by Meter Control Unit, the frequency f according to receiving uniti, define the speed of instrument
Than K, K=a/fi
Corresponding pwm signal transmission frequency f, f=v × K/3600 are calculated according to real-time speed information, and is simulated
Send；
Wherein, K is instrument speed ratio；
fiIt is the frequency of speed receiving unit, unit Hz；
A is the umber of pulse in each cycle, is herein pwm signal, and a is 1；
F is to be simulated the PWM signal frequency for sending, unit Hz；
The real-time speed that v is calculated for instrument, unit K m/h.
That is, when being simulated transmission, speed information is converted to pwm signal and is transmitted by Meter Control Unit, now, root
According to the frequency of receiving unit, the speed ratio of instrument is defined, be simulated and send.Wherein, instrument speed ratio refers to that vehicle often travels 1 kilometer
Corresponding pwm signal umber of pulse, then according to the frequency of receiving unit, calculates instrument speed ratio, due to a by K=a/fi formula
It is the umber of pulse in each cycle, is herein pwm signal, a is 1, so instrument speed is than K=1/fi, afterwards, so that it may according to real-time
Speed calculates corresponding PWM frequency, and is simulated transmission according to formula f=v × K/3600；The PWM that instrument is directly exported
Signal, is influenceed by vehicle complex electromagnetic environment, and waveform can all have a fluctuation, and pwm signal transmission unlike CAN signal
Transmission has very strong fault-tolerance and jamproof ability like that, therefore, it is necessary to be resisted in the output design of pwm signal
Interference is processed, and is no longer repeated herein.
The invention also discloses a kind of for realizing that the control system of the control display methods of automobile digitalization instrument includes：
Motor speed collector, for gathering motor speed signal；Motor speed collector is speed probe；
Gear signal collector, the gear signal for gathering automobile；Gear signal is switching signal, can be believed by gear
Number sensor collection, such as using the Hall approach switch sensor collection gear signal of Hall effect；
Bus control unit, motor speed signal and gear signal, motor speed collector and gear are received by bus
The signal output part of signal picker is connected with bus control unit；Bus control unit is PLC, with receive,
Transmission and process performance；The signal transmission that motor speed collector and gear signal collector are gathered to bus control unit,
Then transmitted to Meter Control Unit through bus control unit and processed；
Meter Control Unit, for receiving motor speed signal and gear signal that bus control unit obtained and carrying out
Analytical Calculation, obtains vehicle speed mileage information, and Meter Control Unit forms interactive connection with bus control unit；Meter Control Unit
PLC is similarly, dissection process can be carried out to the signal for receiving, the process of dissection process is prior art, herein no longer
Repeat；
Display unit, is connected with the output end of Meter Control Unit；Display unit is the LCD display on instrument board.
In the present embodiment, Meter Control Unit includes：
Data processing unit, for obtaining speed information to motor speed signal and gear signal analytical Calculation, and is used for
Simulation sends data operation；
Bus interactive unit, interconnects, with bus control unit for receiving the collection that bus control unit is transmitted
The speed information obtained through data processing unit is simultaneously fed back to bus interactive unit by signal；
Simulation transmitting element, the control unit signal for accessing CAN non-with automobile is connected to be sent to automobile speed
Information；
Data processing unit is connected with bus interactive unit and the simulation equal signal of transmitting element.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to skill of the invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, it all should cover at this
In the middle of the right of invention.
Claims (8)
1. a kind of control display methods of Digital Automobile combination instrument, it is characterised in that：Comprise the following steps：
S1, by CAN obtain motor speed signal and gear signal；
S2, analytical Calculation is carried out to the motor speed signal and gear signal that are obtained by Meter Control Unit at least obtain car
Fast information；
S3, the speed information obtained after display unit is by parsing are shown；
S4, the speed information after parsing is sent to CAN, each control node for CAN is extracted.
2. the control display methods of automobile digitalization instrument according to claim 1, it is characterised in that：In the step 4
Also include：Speed information after treatment is simulated and is sent, the control unit that steam supply Chefei accesses CAN is used.
3. the control display methods of automobile digitalization instrument according to claim 1, it is characterised in that：In the step S2
Speed is theoretical speed, and the calculation of the theoretical speed is：
V=0.377 × R × n/ (io×ii)；
Wherein, v is speed, and unit is Km/h；
R is radius of wheel, and unit is m, and for same car, its value is fixed；
N is motor speed, and unit is r/min；
ioIt is main step-down ratio, its value is fixed；
iiIt is transmission ratio, its value is fixed.
4. the control display methods of automobile digitalization instrument according to claim 1, it is characterised in that：In the step S2
Speed is actual vehicle speed, and the calculation of the actual vehicle speed is：
V=0.377fa×R×n/(io×ii)+fb；
Wherein, v is speed, and unit is Km/h；
R is radius of wheel, and unit is m, and for same car, its value is fixed；
N is motor speed, and unit is r/min；
ioIt is main step-down ratio, its value is fixed；
iiIt is transmission ratio, its value is fixed；
fa、fbIt is speed correction factor and error correction values.
5. the control display methods of automobile digitalization instrument according to claim 2, it is characterised in that：In the step S4
Speed information after parsing is sent to CAN, is included the step of each control node for CAN is extracted：Instrument is controlled
Unit will calculate the vehicle speed value for completing and be sent to bus control unit, with binary code stream after bus control unit is processed
Mode is sent to bus transceiver, is sent into CAN after being converted to bus signals.
6. the control display methods of automobile digitalization instrument according to claim 5, it is characterised in that：Will place in step S4
Speed information after reason is simulated and sends, and includes the step of the control unit that steam supply Chefei accesses CAN is used：
Speed information is converted to pwm signal by Meter Control Unit, the frequency f according to receiving uniti, the speed of instrument is defined than K, K
=a/fi
Corresponding pwm signal transmission frequency f, f=v × K/3600 are calculated according to real-time speed information, and is simulated transmission；
Wherein, K is instrument speed ratio；
fiIt is the frequency of speed receiving unit, unit Hz；
A is the umber of pulse in each cycle, is herein pwm signal, and a is 1；
F is to be simulated the PWM signal frequency for sending, unit Hz；
The real-time speed that v is calculated for instrument, unit K m/h.
7. a kind of control of the control display methods for realizing the automobile digitalization instrument as described in claim 1-6 any claims
System processed, it is characterised in that：Including：
Motor speed collector, for gathering motor speed signal；
Gear signal collector, the gear signal for gathering automobile；
Bus control unit, motor speed signal and gear signal, the motor speed collector and described are received by bus
The signal output part of gear signal collector is connected with the bus control unit；
Meter Control Unit, for receiving motor speed signal and gear signal that bus control unit obtained and being parsed
Calculate, obtain vehicle speed mileage information, the Meter Control Unit is formed with the bus control unit and interconnected；
Display unit, the output end with the Meter Control Unit is connected
8. control system according to claim 7, it is characterised in that：The Meter Control Unit includes：
Data processing unit, for obtaining speed information to motor speed signal and gear signal analytical Calculation, and for simulating
Send data operation；
Bus interactive unit, interconnects, with bus control unit for receiving the collection signal that bus control unit is transmitted
And the speed information obtained through data processing unit is fed back to bus interactive unit；
Simulation transmitting element, the control unit signal for accessing CAN non-with automobile is connected to be sent to automobile speed information；
The data processing unit is connected with the bus interactive unit and the equal signal of simulation transmitting element.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107554452A (en) * | 2017-09-05 | 2018-01-09 | 深圳市路畅科技股份有限公司 | A kind of system for realizing digital vehicle instrument and vehicle device interaction |
| CN108909455A (en) * | 2018-07-20 | 2018-11-30 | 安徽江淮汽车集团股份有限公司 | Digitize speed display methods and system |
| CN109017800A (en) * | 2018-08-27 | 2018-12-18 | 汽解放汽车有限公司 | A kind of commercial vehicle vehicle speed processing device based on entire car controller |
| CN111873927A (en) * | 2020-07-10 | 2020-11-03 | 东风华神汽车有限公司 | Method and system for outputting vehicle speed by combination instrument |
| CN113442785A (en) * | 2020-03-26 | 2021-09-28 | 北京新能源汽车股份有限公司 | Method, device, vehicle and equipment for determining battery use mileage |
| CN114030356A (en) * | 2021-12-14 | 2022-02-11 | 航天科技控股集团股份有限公司 | Configuration method of speed ratio of automobile combination instrument |
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| CN111873927A (en) * | 2020-07-10 | 2020-11-03 | 东风华神汽车有限公司 | Method and system for outputting vehicle speed by combination instrument |
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