CN107942777A - A kind of control method of engine speed indicator stability - Google Patents
A kind of control method of engine speed indicator stability Download PDFInfo
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- CN107942777A CN107942777A CN201711073079.0A CN201711073079A CN107942777A CN 107942777 A CN107942777 A CN 107942777A CN 201711073079 A CN201711073079 A CN 201711073079A CN 107942777 A CN107942777 A CN 107942777A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims description 18
- 238000013016 damping Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000875 corresponding effect Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000008450 motivation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
A kind of control method of engine speed indicator stability, it includes control unit of engine, and CAN bus, rotating speed sampling module, is characterized in that：Control unit of engine output terminal is connected by CAN bus and rotating speed sampling module with the input terminal of tach signal receiving module respectively, input terminal of the output terminal of tach signal receiving module respectively with idling mode processing unit and common-mode processing unit is connected, and the input terminal of idling mode processing unit and common-mode processing unit output terminal then with revolution counter display unit is connected.The emphasis of the present invention is that the microprocessor unit in instrument, it is tach signal receiving module first, it judges it is which kind of pattern be at this time according to the working status of present engine, it is idling mode or common-mode, so as to select to enter idling mode processing unit or common-mode processing unit, according to the filter value that present engine at the algorithm operating workflow management of lower section is rotating speed so as to drive revolution counter display unit to show.
Description
Technical field
The invention belongs to technical field of automobile electronic control, specifically a kind of control of engine speed indicator stability
Method.The invention is based on collection of simulant signal, CAN（Controller local area network）Bussing technique, data processing and driving are corresponding
Mechanism shows that engine speed indicator obtains control mode.
Background technology
Engine speed indicator obtains revolution for showing that engine is per minute, passes through CAN bus or engine speed indicator samples
Present engine rotary speed information is inputed to the Micro-processor MCV of combination instrument by circuit, and MCU turns according to pre-set engine
Control engine speed indicator is shown after obtained engine speed value is applied filtering algorithm by fast parameter list.Engine at present
It is also multimodal various that revolution counter, which obtains display format, has what traditional stepper motor drive finger was shown, also has in liquid crystal display
Directly displayed with numeral, but since the rotating speed output of engine itself is inherently continually changing, so rotating speed
Phenomena such as a degree of shake or display saltus step fluctuation can all occur in the process of running in list index, and why very here it is
More people shake at the uniform velocity travelling but panesthesia pointer within the specific limits, influence the riding experience of driver.
The content of the invention
The object of the present invention is to provide a kind of hair for being used to improve instrument cluster pointer shake or display saltus step bad phenomenon
The control method of motivation revolution counter stability.The present invention is a kind of brand-new engine speed indicator control mode, by what is collected
Actual engine speed value drives engine speed indicator to carry out corresponding actions after applying certain filtering process.Below with stepping electricity
Machine driving pointer is introduced exemplified by showing, liquid crystal display is shown similarly.Engine speed indicator is divided into according to the state of engine
Two kinds of different operating modes, one kind is idling mode, and one kind is common-mode.
The purpose of the present invention is by following technical solution to realize：A kind of controlling party of engine speed indicator stability
Method, it includes control unit of engine, CAN bus, rotating speed sampling module, revolution counter display unit, it is characterized in that：Engine
Control unit output terminal is connected by CAN bus and rotating speed sampling module with the input terminal of tach signal receiving module respectively,
Input terminal of the output terminal of tach signal receiving module respectively with idling mode processing unit and common-mode processing unit is connected
Connect, the input terminal of idling mode processing unit and common-mode processing unit output terminal then with revolution counter display unit is connected.
Present invention additionally comprises by tach signal receiving module by CAN bus or rotating speed sampling module, will currently be sent out again
Motivation rotary speed information inputs to the Micro-processor MCV of combination instrument, and MCU is according to the pre-set engine speed parameter table of comparisons
Control engine speed indicator is shown to prompt user's present engine to turn after obtained engine speed value is applied filtering algorithm
Fast information.
Idling mode processing unit and common-mode processing unit of the present invention include the following steps：
Whether detection present engine state is in idling mode, if otherwise according to common-mode filtering algorithm：Present engine
The filter value of rotating speed=[the filter value * of last engine speed（Filter constant -1 is damped under common-mode）+ currently connect
The engine speed value of receipts] filter constant is damped under/common-mode, started according to the driving of the filter value of present engine rotating speed
Machine revolution counter is shown；If so, engine speed indicator, which enters idling mode, performs next step；
Compare the filter value whether present engine tach signal is more than last engine speed, if then being filtered according to idling
Algorithm：The filter value of the filter value of present engine rotating speed=last time engine speed+（Currently received engine speed
The filter value of value-last time engine speed）Damping filter constant under/idling mode, according to the filter of present engine rotating speed
Wave number driving engine speed indicator is shown；Otherwise, then according to filtering algorithm：The filter value of present engine rotating speed=upper one
The filter value of secondary engine speed-（The filter value of last engine speed-currently received engine speed value）/ idling
Damping filter constant under pattern, drives engine speed indicator to be shown according to the filter value of present engine rotating speed.
The operation principle of the invention includes：Control unit of engine EMS, the microprocessor unit of combination instrument, CAN bus
Or engine speed indicator sample circuit and revolution counter display unit；Control unit of engine drives triode by bleeder circuit
Base stage and emitter between effectively can turn on and end, the emitter of triode ground connection, the collector of triode passes through electricity
Resistance is pulled to 5-8V, and when triode ON, the collector voltage of triode is essentially identical to emitter voltage, input low level
To Micro-processor MCV；When triode ends, the collector voltage of triode is equal to pull-up voltage 5-8V, input high level
5-8V is to Micro-processor MCV.Micro-processor MCV forms the pulse signal of certain frequency, and root according to the low and high level received
Revolution counter display unit, which is directly driven, according to pre-set engine speed parameter table shows corresponding rotary speed information.
As control unit of engine supports CAN bus communication, then control unit of engine is by twisted-pair feeder with combining instrument
The MCU of table is connected, and MCU is converted into the decimal system according to the hexadecimal that control unit of engine is sent, and is multiplied by precision and obtains
Engine speed corresponding to the signal, MCU driving revolution counter display units show corresponding rotary speed information.
The emphasis of the present invention is that microprocessor unit in instrument, is tach signal receiving module first, its basis
The working status of present engine judges to be which kind of pattern be at this time, be idling mode or common-mode, so as to select
Into idling mode processing unit or common-mode processing unit, according to present engine at the algorithm operating workflow management of lower section
For rotating speed filter value so as to driving revolution counter display unit to show.
But the actual vehicle tach signal that engine exports in use fluctuates in certain scope always, with
Software block diagram toward engine speed indicator is exactly to receive tach signal to be used directly to calculate, the display of such revolution counter and pointer
Shaking always.Advantages of the present invention is that improving MCU in combination instrument corresponds to the engine rotational speed signal that receives
The improvement that software block diagram carries out, devises two kinds of different operating modes, one kind is idling mode, and one kind is common-mode.This
The design of two kinds of operating modes, can lift the stability that revolution counter is shown, what reduction revolution counter occurred in use trembles
Dynamic amplitude, allows revolution counter with smoothness run, can lift the satisfaction of client's riding experience during whole use.
Brief description of the drawings
Fig. 1 is structural principle block diagram of the present invention；
Fig. 2 is the rotating speed filtering algorithm operational flowchart of the present invention.
The present invention is described in further details by example below in conjunction with attached drawing, but following examples is only this hair
Bright example therein, does not represent the rights protection scope that is limited of the present invention, and the scope of the present invention is to weigh
Subject to sharp claim.
Embodiment
Example 1
As shown in Fig. 1-2, it includes control unit of engine, CAN bus, rotating speed sampling module；Control unit of engine is defeated
Outlet is connected by CAN bus and rotating speed sampling module with the input terminal of tach signal receiving module respectively, and tach signal connects
Receive input terminal of the output terminal of module respectively with idling mode processing unit and common-mode processing unit to be connected, idling mode
The input terminal of processing unit and common-mode processing unit output terminal then with revolution counter display unit is connected.
Tach signal is inputed to the rotating speed in MCU by revolution counter Acquisition Circuit or CAN bus by control unit of engine
Signal receiving module, it judges whether be in idling mode at this time according to the working status of present engine.There is two ways
It can be determined that whether present engine is in idling mode, a kind of EMS（Engine management control unit）CAN bus is supported to lead to
Letter, present engine state can be sent in bus for other ECU as reference by EMS, as shown in table 1 below, when MCU connects
When receiving EMS2_St_EMS=2, that is, represent that present engine is in idling mode；, can not as EMS does not support CAN bus to communicate
The corresponding state of engine is sent, can judge present engine state according to the actual conditions of engine come artificial, such as should
Engine speed value under the normal idle conditions of money engine is 750rpm, we can calibrate vehicle under idle conditions
The effective range of engine speed, such as engine minimum speed is Min, maximum speed Max under idle conditions, when combination instrument
Table detects that engine speed is more than Min and is less than Max, and the duration is in idle more than 3s, i.e. judgement present engine
Fast mode.
Table 1, EMS-CAN bus communication protocols
Such as it is currently at the filter value that engine speed value under idling mode processing unit is more than last engine speed, idling
Filtering algorithm under pattern is as follows：
The filter value of the filter value of present engine rotating speed=last time engine speed+（Currently received engine speed value-
The filter value of last engine speed）Damping filter constant under/idling mode；
Otherwise, the filtering algorithm under idling mode is as follows：
The filter value of the filter value of present engine rotating speed=last time engine speed-（The filtering of last engine speed
Value-currently received engine speed value）Damping filter constant under/idling mode.
Remarks：The scope of damping filter constant under idling mode is 1 ~ 255, it is stored in EEPROM（Electrically erasable is only
Read memory）In and can be edited, default value 5.
When engine condition is unsatisfactory for the decision condition of idling mode, system will immediately exit from idling mode, into normal
Operating mode, i.e. common-mode.Filtering algorithm under common-mode processing unit is as follows：
The filter value of present engine rotating speed=[the filter value * of last engine speed（Damping filtering is normal under common-mode
Number -1）+ currently received engine speed value] filter constant is damped under/common-mode.
Remarks：Damping filter constant under common-mode, it is stored in EEPROM and can be edited, and default value is
4, filtering sampling time interval is 100ms.
Example：The filter value of last engine speed is 600rpm under idling mode, and present engine tachometer value is
The filter value of present engine rotating speed can be calculated in 700rpm, the MCU inside combination instrument according to corresponding filtering algorithm
For：600+（700-600）/5=620rpm.MCU according to the pre-set engine speed parameter table of comparisons by its（Current power
The filter value of machine rotating speed）The micro-stepping number of specific stepper motor is converted into, so that Driving Stepping Motor drives pointer to be started
The corresponding instruction of machine revolution counter.Accordingly even when engine speed value is beated always, the engine after the filtering algorithm of design
Revolution counter, which can also be maintained within a certain range, avoids engine speed indicator from being fluctuated always with actual engine speed output valve.
Filtering algorithm more than under the idling mode and common-mode of design is in order to avoid engine speed indicator exists
The bad phenomenons such as the shake and saltus step that occur in operational process, so as to provide a stabilization, smooth hair for the display of revolution counter
Motivation rotary speed information is prompted, and prompts customer experience.
Engine speed parameter table of comparisons example：
| Tachometer value（rpm） | Dial plate corresponding angle（°） | Stepper motor steps（Micro-stepping） |
| 1000 | 40 | 480 |
| 2000 | 80 | 960 |
| 3000 | 120 | 1440 |
| 4000 | 160 | 1920 |
| 5000 | 200 | 2400 |
| 6000 | 240 | 2880 |
The effective indication range of engine speed indicator：0rpm ~ 6000rpm, 240 ° of corresponding angle, the precision of most of stepper motors are
1/12 °, we claim it to cry 1 micro-stepping, i.e. 1 micro-stepping is equal to 1/12 °, 1 ° of corresponding 25rpm on engine speed indicator dial plate
（6000rpm/240°）, so as to fulfill the purpose of the present invention.
Claims (3)
1. a kind of control method of engine speed indicator stability, it includes control unit of engine, CAN bus, and rotating speed is adopted
Egf block, revolution counter display unit, it is characterized in that：Control unit of engine output terminal is sampled by CAN bus and rotating speed respectively
Module is connected with the input terminal of tach signal receiving module, the output terminal of tach signal receiving module respectively with idling mode
The input terminal of reason unit and common-mode processing unit is connected, idling mode processing unit and the output of common-mode processing unit
The input terminal then with revolution counter display unit is held to be connected.
2. control method according to claim 1, it is characterized in that：By CAN bus or rotating speed sampling module, again by turning
Present engine rotary speed information is inputed to the Micro-processor MCV of combination instrument by fast signal receiving module, and MCU is according to pre-setting
The engine speed parameter table of comparisons will obtained engine speed value apply filtering algorithm after control engine speed indicator show
To prompt user's present engine rotary speed information.
3. control method according to claim 1 or 2, it is characterized in that：The idling mode processing unit and common-mode
Processing unit includes the following steps：
Whether detection present engine state is in idling mode, if otherwise according to common-mode filtering algorithm：Present engine
The filter value of rotating speed=[the filter value * of last engine speed（Filter constant -1 is damped under common-mode）+ currently connect
The engine speed value of receipts] filter constant is damped under/common-mode, started according to the driving of the filter value of present engine rotating speed
Machine revolution counter is shown；If so, engine speed indicator, which enters idling mode, performs next step；
Compare the filter value whether present engine tach signal is more than last engine speed, if then being filtered according to idling
Algorithm：The filter value of the filter value of present engine rotating speed=last time engine speed+（Currently received engine speed
The filter value of value-last time engine speed）Damping filter constant under/idling mode, according to the filter of present engine rotating speed
Wave number driving engine speed indicator is shown；Otherwise, then according to filtering algorithm：The filter value of present engine rotating speed=upper one
The filter value of secondary engine speed-（The filter value of last engine speed-currently received engine speed value）/ idling
Damping filter constant under pattern, drives engine speed indicator to be shown according to the filter value of present engine rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711073079.0A CN107942777A (en) | 2017-11-04 | 2017-11-04 | A kind of control method of engine speed indicator stability |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711073079.0A CN107942777A (en) | 2017-11-04 | 2017-11-04 | A kind of control method of engine speed indicator stability |
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| CN107942777A true CN107942777A (en) | 2018-04-20 |
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| CN201711073079.0A Withdrawn CN107942777A (en) | 2017-11-04 | 2017-11-04 | A kind of control method of engine speed indicator stability |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109774477A (en) * | 2019-01-24 | 2019-05-21 | 浙江吉利汽车研究院有限公司 | Vehicle revolving speed display control method and system, vehicle |
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