CN102879051A - Vehicle instrument fuel alarm fluctuation processing method - Google Patents
Vehicle instrument fuel alarm fluctuation processing method Download PDFInfo
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- CN102879051A CN102879051A CN2012102733296A CN201210273329A CN102879051A CN 102879051 A CN102879051 A CN 102879051A CN 2012102733296 A CN2012102733296 A CN 2012102733296A CN 201210273329 A CN201210273329 A CN 201210273329A CN 102879051 A CN102879051 A CN 102879051A
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Abstract
The invention provides a full-digital vehicle combined instrument fuel alarm fluctuation processing method based on software processing. By using different filtering schemes, signal output fluctuation influence caused by different running states of a vehicle on a fuel sensor is reduced; and accurate measurement and judgment for low-liquid-level alarm of vehicle fuel can be accurately controlled by anti-fluctuation control over a fuel meter driving motor. By the method, fluctuation of a pointer of a fuel meter can be effectively prevented; and a mis-alarm phenomenon caused by cyclic alarm of a fuel alarm lamp is avoided.
Description
Technical field
Design vehicle total digitalization instrument signal disposal route of the present invention, particularly a kind of automobile instrument fuel oil alarm fluctuation disposal route.
Background technology
Collection to each signal after the automobile instrument total digitalization greatly improves with the processing real-time, but because the realization of automobile fuel oil sensor is mainly passed through in the collection of automobile fuel gauge, its Main Function is kinetic measurement fuel oil surplus.Adopt at present the oscillating rod type Floater Structure more] with the variation of fuel liquid level, export the sampled measurements of realizing Fuel Remained and switch different resistances at thick-film resistor.Because its output signal of sensor device of this structure mainly is to switch resistance value corresponding to diverse location by the displacement of skate, the step evolution that has so just formed output resistance changes.
Because the variation of the various transport conditions of automobile can cause Oil Level to be in the continuous fluctuation, if the real-time sampling signal is not processed the fluctuation that will cause signal, thereby cause the constantly up and down fluctuation of pointer of automobile fuel gauge, and then cause the visual fatigue to driver and crew.
In order in time to remind the situation of the low liquid level of human pilot dynamic knowledge fuel oil, the full digital automobile electronic combined instrument has increased the function that low fuel liquid level is reported to the police to fuel gauge, the major way of the low liquid level fuel oil alarm of realization is realized by the fuel oil alarm lamp, its effect is the immediately shinny warning when being less than certain certain value of the amount of fuel in fuel tank, to cause driver's attention.
Fuel oil alarm point generally be located at the fuel tank maximum volume 1/8 near, because fuel tank impurities at bottom and moisture are more, when so Fuel Remained is lower than at 1/8, for engine fuel induction systems such as the fuel pump of vehicle, electric sprayers in various degree infringement is arranged, so the driver should in time refuel after finding that the fuel oil alarm lamp is reported to the police.
In addition, the phenomenon that fuel oil alarm all can be reported by mistake under a lot of conditions especially when fuel oil is near alarm set point, fuel oil alarm lamp circulation warning often occurs and separates the newspaper phenomenon.
Summary of the invention
For addressing the above problem, the present invention proposes the method that a kind of all-digital auto combination instrument fuel oil alarm fluctuation of processing based on software is processed, the signal output pulsation that at first utilizes different filters solutions minimizing fuel sensors brought by the running car different conditions affects, by the anti-fluctuation control to the fuel gauge drive motor, accurately control is to Measurement accuracy and the judgement of the low liquid level warning of vehicle fuel afterwards.
The present invention is achieved in that
At first, the fuel oil surplus is carried out repeatedly sampled measurements, and carry out filtering according to the result of sampled measurements repeatedly and calculate, provide calculated value; Wherein the algorithm that calculate to adopt of filtering is one or more the combination in amplitude limit filter method, middle position value filtering method, arithmetic mean filter method, recurrence average filter method, the way of median average filter, amplitude limit average filter method, first-order lag filter method, weighted mean filter method, Glitch Filter method and the amplitude limit Glitch Filter method.
Afterwards, according to calculated value and the motoring condition that filtering calculates, the fuel gauge drive motor is implemented anti-fluctuation control strategy, owing to affecting fuel oil alarm, the reason that the wrong report phenomenon occurs mainly contains following three aspects:
(1) there is born space defective in kart when design, and this causes the fuel oil box of kart that individual common feature is arranged, and that is exactly flat, length and width.And fuel sensor is a variable resistor of being controlled by the float height, and combination instrument is sampled to this resistance, drives scale corresponding to pointed.This flat fuel tank cooperates float sensor when driving because the teetertottering of oil level, and the resistance fluctuation that can cause instrument to take is very serious, causes the in the past back and forth slowly drift of pointer of instrument, and the circulation of fuel oil alarm lamp is reported to the police and separated newspaper.
(2) during parking of automobile, the parking spot place on the slope.Behind automobile flameout, can enter quick response modes from new igniting fuel gauge more like this.Response is to the corresponding scale of current fuel liquid level position in the 2S clock.Because current parking spot is on the slope, therefore in various degree higher or on the low side can appear in the resistance of fuel sensor.So just caused the fuel gauge pointer indicating position different with the last position indicated before flame-out of automobile, two of the fuel oil alarm lamp state that goes out is also probably different.
The different conditions such as (3) automobile travels for a long time on upward slope or descending in addition, anxious acceleration, zig zag also can cause the fuel liquid level drift, and wrong report appears in alarm set point.
Therefore, can adopt anti-fluctuation control strategy with the instance fuel meter drive motor:
(1) increase the fuel oil memory pattern, i.e. each automobile flameout, automobile instrument are remembered the oil mass value of last time before flame-out, after automobile is lighted a fire again, relatively currency and memory value, if difference between the two less than the threshold values of setting, then pointer fast response to memory area; If greater than this threshold values, then response is to currency fast for pointer, and described threshold values is 1/10 of Full Tanks.
(2) strengthen the fuel gauge damping, increase damping time is 2S, and namely increasing fuel gauge drive motor needed time that whenever makes a move is 2S.
(3) with separating between the newspaper point state retaining zone is set at fuel oil alarm point, the state retaining zone is 1/16 of gamut.
By repeatedly carrying out the fuel oil sampled measurements, and calculate by filtering, to greatest extent in the less vehicle traveling process owing to vehicle body rocks the inaccurate problem of the fuel measurement that causes.
Pass through again the anti-fluctuation control to the fuel gauge drive motor, can effectively eliminate the problems such as the fluctuation of fuel gauge pointer, circulation warning solution newspaper.
Increase the fuel oil memory pattern, and set threshold values, can effectively distinguish the state of automobile fuel filler front and back, also can eliminate the fuel measurement value fluctuation problem that automobile causes owing to the stop state simultaneously.
The damping of increasing fuel gauge can effectively solve the fuel gauge pointer and rock problem.
The state retaining zone that strengthens between the same solution newspaper of the fuel oil alarm point point can effectively solve fuel gauge alarm lamp circulation warning solution newspaper problem.
Above method synthesis uses and can solve to the full extent because the fuel liquid level drift causes the fuel sensor signal fluctuation, and the phenomenon of wrong report appears in the fuel oil alarm lamp.
Description of drawings
Fig. 1 is this method implementing procedure figure;
Embodiment
Below in conjunction with embodiment, this method is carried out more detailed explanation.
The fuel oil surplus is being carried out in sampled measurements and the filtering computation process, the algorithm that filtering calculate to be adopted is one or more the combination in amplitude limit filter method, middle position value filtering method, arithmetic mean filter method, recurrence average filter method, the way of median average filter, amplitude limit average filter method, first-order lag filter method, weighted mean filter method, Glitch Filter method and the amplitude limit Glitch Filter method.The specific algorithm that these filtering are calculated with and advantage as follows:
(1) limit filtration method (the title program is judged filter method again)
Rule of thumb judge, determine the maximum deflection difference value (being made as A) that double sampling allows, judge when detecting new value: if this sub-value and upper sub-value poor＜=A at every turn, then this sub-value is effective, if this sub-value is poor with upper sub-value〉A, then this sub-value is invalid, abandons this sub-value, uses sub-value and replaces this sub-value.Advantage: can effectively overcome the impulse disturbances that causes because of accidentalia.
(2) middle position value filtering method
Continuous sampling N time (N gets odd number) is arranged N sampled value by size, gets intermediate value and is this effective value.
Advantage: can effectively overcome the fluctuation that causes because of accidentalia and disturb; To the variation of temperature, liquid level slowly measured parameter good filter effect is arranged.
(3) arithmetic mean filter method
Get continuously N sampled value and carry out the arithmetic mean computing, when the N value was larger: the signal smoothing degree was higher, but sensitivity is lower, the N value hour: the signal smoothing degree is lower, but sensitivity is higher, the choosing of N value: general flow, N=12; Pressure: N=4.
Advantage: be applicable to the signal that generally has random disturbance is carried out filtering, the characteristics of signal are that a mean value is arranged like this, and signal is up and down fluctuation near a certain numerical range.
(4) recurrence average filter method (claiming again the moving average filter method)
Regard a formation as getting continuously N sampled value, the length of formation is fixed as N, samples a new data at every turn and puts into tail of the queue, and throw away a secondary data of original head of the queue. and (first in first out), N in a formation data are carried out the arithmetic mean computing, just can obtain new filtering result.Choosing of N value: flow, N=12; Pressure: N=4; Liquid level, N=4 ~ 12; Temperature, N=1 ~ 4.
Advantage: PERIODIC INTERFERENCE is had good inhibiting effect, and smoothness is high, is applicable to the system of the higher-order of oscillation.
(5) the way of median average filter (claiming again anti-impulse disturbances average filter method)
Be equivalent to " middle position value filtering method "+" arithmetic mean filter method ", a continuous sampling N data are removed a maximal value and a minimum value, then calculate the arithmetic mean of N-2 data.Choosing of N value: 3 ~ 14.
Advantage: merged the advantage of two kinds of filter methods, disturbed for the accidental pulse feature that occurs, can eliminate because the caused sampled value deviation of impulse disturbances.
(6) amplitude limit average filter method
Be equivalent to " limit filtration method "+" recurrence average filter method ", the new data that at every turn samples carries out first amplitude limiting processing, sends into formation again and carries out recurrence average filtering processing.
Advantage: merged the advantage of two kinds of filter methods, disturbed for the accidental pulse feature that occurs, can eliminate because the caused sampled value deviation of impulse disturbances.
(7) first-order lag filter method
Get a=0 ~ 1, this sampled value of the *+a* filtering last time result of this filtering result=(1-a)
Advantage: PERIODIC INTERFERENCE is had good inhibiting effect, be applicable to the higher occasion of vibration frequency
(8) weighting recurrence average filter method
The improvement to the recurrence average filter method, i.e. different data constantly different power in addition, normally, more near the data of now, power obtains larger.The weight coefficient that gives new sampled value is larger, and then sensitivity is higher, but the signal smoothing degree is lower.
Advantage: be applicable to the object than the large time delay time constant, and the sampling period shorter system.
(9) Glitch Filter method
A filtering counter is set, each sampled value and current effective value is compared: if sampled value=current effective value, then counter O reset; If sampled value＜〉current effective value, counter+1 then, and whether judge counter 〉=upper limit N (overflowing); If counter overflow is then replaced this sub-value current effective value, and clear counter.
Advantage: measured parameter has preferably filter effect for changing slowly, can avoid near the repeatedly ON/OFF of the controller critical value beat or display on numerical value shake.
(10) amplitude limit Glitch Filter method
Be equivalent to " limit filtration method "+" Glitch Filter method ", first amplitude limit, after disappear and tremble.
Advantage: inherited the advantage of " amplitude limit " and " disappear and tremble ", improved some defective in " Glitch Filter method ", avoided the interference value import system.
Afterwards, according to calculated value and the motoring condition that filtering calculates, the fuel gauge drive motor is implemented anti-fluctuation control strategy:
(1) method that strengthens the fuel gauge damping solves the problem that fuel oil rocks.Increase damping time is 2S.(be exactly that motor is not walked the needed time in 1 step damping time.For example the fuel gauge maximum scale angle of release of 1 section of instrument is 90 degree, and pointer drives to the E point from the F point so needs the walking 90*12=1080 step.That is to say that pointer drives to the E the fastest time spent of point from the F point and also wants 2160S).
(2) increase the fuel oil memory pattern, i.e. each automobile flameout, instrument can be remembered the position that current pointer is indicated.After automobile is lighted a fire again, current sampling oil level is compared with the memory oil level.If difference between the two is less than the threshold value of certain setting, then pointer responds memory area fast.If greater than this threshold value, think that then automobile refuels.Pointer fast response arrives current sampling location.(threshold value generally be set as Full Tanks about 1/10).
(3) strengthen fuel oil alarm point with the state retaining zone of separating between the newspaper point.The current employing state of the design retaining zone is 1/16 of gamut.Even the corresponding warning step number of alarm set point was 150 steps.The gamut step number was 1080 steps, then separated the newspaper point and was 150+(1080/16)=218 steps.As shown in the table:
Claims (7)
1. automobile instrument fuel oil alarm fluctuation disposal route is characterized in that may further comprise the steps:
Step 1 is carried out repeatedly sampled measurements to the fuel oil surplus;
Step 2 is carried out filtering according to the result of sampled measurements repeatedly and is calculated, and provides calculated value;
Step 3, the calculated value that integrating step 2 obtains and motoring condition are implemented anti-fluctuation control strategy to the fuel gauge drive motor;
Step 4 provides current amount of fuel according to the controlled policy-driven fuel gauge of step 3 motor.
2. automobile instrument fuel oil alarm according to claim 1 fluctuation disposal route is characterized in that it is one or more combination in amplitude limit filter method, middle position value filtering method, arithmetic mean filter method, recurrence average filter method, the way of median average filter, amplitude limit average filter method, first-order lag filter method, weighted mean filter method, Glitch Filter method and the amplitude limit Glitch Filter method that the algorithm that adopts is calculated in filtering in the described step 2.
3. automobile instrument fuel oil alarm according to claim 1 and 2 fluctuation disposal route, it is characterized in that comprising following methods in the described step 3: automobile instrument is remembered flame-out front oil mass value last time, after automobile is lighted a fire again, compare currency and memory value, if difference between the two is less than the threshold values of setting, then pointer responds memory area fast; If greater than this threshold values, then pointer responds currency fast.
4. automobile instrument fuel oil alarm fluctuation disposal route according to claim 3 is characterized in that described threshold values is 1/10 of Full Tanks.
5. automobile instrument fuel oil alarm according to claim 1 and 2 fluctuation disposal route is characterized in that comprising in the described step 3 following methods: increasing fuel gauge drive motor needed time that whenever makes a move is 2S.
6. automobile instrument fuel oil alarm fluctuation disposal route according to claim 1 and 2 is characterized in that comprising in the described step 3 following methods: with separating between the newspaper point state retaining zone is set at fuel oil alarm point.
7. automobile instrument fuel oil alarm fluctuation disposal route according to claim 6 is characterized in that described state retaining zone is 1/16 of gamut.
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| CN103150411A (en) * | 2013-03-07 | 2013-06-12 | 东北石油大学 | Universal embedded multi-path data collector and signal collection wave filtering method |
| CN103335689A (en) * | 2013-06-08 | 2013-10-02 | 三一汽车制造有限公司 | Liquid level abnormality judgment method and device |
| CN103699791A (en) * | 2013-12-18 | 2014-04-02 | 贵阳永青仪电科技有限公司 | Analog measuring data processing method based on non-rapid variation |
| CN104344865A (en) * | 2013-07-30 | 2015-02-11 | 北汽福田汽车股份有限公司 | Automobile fuel signal processing method and automobile fuel signal processing system |
| CN104677446A (en) * | 2013-11-28 | 2015-06-03 | 北汽福田汽车股份有限公司 | Vehicle fuel meter pointer control method and system |
| CN104679803A (en) * | 2013-12-03 | 2015-06-03 | 上海移为通信技术有限公司 | Method and device for processing data outputted by oil level sensor of vehicle |
| CN105277252A (en) * | 2015-11-05 | 2016-01-27 | 北京奔驰汽车有限公司 | Automotive liquid level alarm device, automobile and automotive liquid level alarm method |
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Application publication date: 20130116 |