CN101619993A - Method for measuring automotive average fuel consumption - Google Patents

Abstract

The invention provides a method for measuring automotive average fuel consumption, which comprises the following steps: acquiring fuel injection pulse signals, mileage pulse number and speed pulse signals, and calculating and obtaining consumed fuel, speed and travelled mileage according to the fuel injection pulse signals, the mileage pulse number and the speed pulse signals; judging whether the data is within an effective calculation range, and when the data is effective, performing first-order lag filter on the data value; and calculating and obtaining automotive average fuel consumption, wherein the consumed fuel value and the travelled mileage value are stored after an engine closes lighting, and are continuously accumulated and calculated after the engine relights. According to the steps, the method can analyze and judge whether input signals are effective, and ensure the data reliability of calculated average fuel consumption, and the first-order lag filter for the input signals ensures that the average fuel consumption data displayed by a meter is not continuously updated, and is convenient for a driver to observe the average fuel consumption information.

Description

The measuring method of automotive average fuel consumption

Technical field

The present invention relates to a kind of measured automobiles fuel consumption measurement method, and be particularly related to a kind of measuring method of automotive average fuel consumption.

Background technology

Current automobile instrument is except showing mileage, speed, rotating speed, temperature and oil mass information, and the driver also wonders the information except these essential informations, and so the driver just can better understand the enforcement situation of automobile.The driver wishes that automobile instrument can provide more automobile information, just more and more paid close attention to such as these enforcement information such as the outer temperature of average fuel consumption, instantaneous oil consumption, continual mileage, driving time, average velocity, fuel oil surplus and car, and be applied in more and more on the various different automobile types by the consumer.We are referred to as car running computer these running informations.They are to take all factors into consideration oil consumption, oil mass Fuel Oil Remaining, and aspect situations such as automobile enforcement average velocity and enforcement distance obtain after the algorithm of process more complicated and the processing again.So, the driver just can obtain an integrated information that automobile is overall, thereby can better driving experience enjoyment, condition of road surface and take the time.

Average fuel consumption has reflected the average fuel consumption level that is consumed under the historical distance travelled of automobile, and the driver can recognize the oil consumption situation of automobile, thereby judges the performance of automobile and estimate the excess oil mileage.Yet the needed car running computer input signal of current calculating average fuel consumption is invalid data probably, prior art can not provide analysis to vehicle signal, judge whether it can use, whether can not analyze it is consistent with actual conditions, probably cause the untrue and spillover of data, simultaneously input signal is also in continuous variation, causes that response speed is too fast to make moving variation of digital beating heart that shows on the instrument, thereby causes certain difficulty when giving driver's observation average fuel consumption information.

Summary of the invention

The present invention proposes a kind of method of measured automobiles average fuel consumption, whether it can carry out analysis and judgement to input signal effective, the data that guaranteed the calculating average fuel consumption are reliable, and input signal carried out first-order lag filtering, the average fuel consumption data that make instrument show can be broken and be beated, and make things convenient for driver's observation average fuel consumption information.

To achieve these goals, the present invention proposes a kind of method of measured automobiles average fuel consumption, and this method comprises the steps:

Gather the fuel injection pulse signal of engine management module output;

Add up according to the data of above-mentioned fuel injection pulse signal and to obtain fuel consumption;

Gather the vehicle speed pulse signal of vehicle speed sensor output;

Go out distance travelled according to above-mentioned vehicle speed pulse signal acquisition vehicle speed data and accumulation calculating;

Judge above-mentioned fuel consumption and distance travelled whether in effective computer capacity;

When above-mentioned these data are effective, above-mentioned these data values are carried out first-order lag filtering;

Relatively calculate through the value of fuel consumption of first-order lag Filtering Processing and distance travelled value above-mentioned, obtain the average oil consumption of automobile;

The wherein above-mentioned value of fuel consumption is saved after the tail-off igniting with distance travelled value, and accumulation calculating is continued in the engine back of lighting a fire again.

Further, when above-mentioned vehicle speed value judge when above-mentioned distance travelled is greater than 100m greater than zero-sum above-mentioned speed of a motor vehicle numerical value and distance travelled in effective computer capacity.

Further, the above-mentioned value of fuel consumption and distance travelled value are drawn by separately accumulator computes respectively.

Further, the capacity of the above-mentioned totalizer of fuel consumption is 100L, and the capacity of the above-mentioned totalizer of distance travelled is 1999km, when in above-mentioned two totalizers any one reaches max cap., the data of above-mentioned two totalizers be multiply by 0.5 simultaneously.

Further, when the speed of a motor vehicle was zero, above-mentioned two totalizers stopped to add up.

Further, this method more comprises by the liquid crystal electron instrument above-mentioned average oil consumption is shown with digital form.

Further, this method comprises that more above-mentioned these data zero clearings restart to calculate after pressing reset button.

The method of the measured automobiles average fuel consumption that the present invention proposes, at first obtain the fuel injection pulse signal, with mileage umber of pulse and vehicle speed pulse signal, and calculate fuel consumption according to them, the speed of a motor vehicle and distance travelled, judge that then these data are whether in effective computer capacity, when data are effective, these data values are carried out first-order lag filtering, calculate the average oil consumption of automobile then, whether can carry out analysis and judgement to input signal according to above-mentioned steps the present invention effective, the data that guaranteed the calculating average fuel consumption are reliable, to the first-order lag filtering that input signal carries out, the average fuel consumption data that make instrument show can be broken and be beated, and make things convenient for driver's observation average fuel consumption information.

Description of drawings

Figure 1 shows that the process flow diagram of a preferred embodiment of the present invention.

The instrument that Figure 2 shows that a preferred embodiment of the present invention shows synoptic diagram.

Embodiment

In order more to understand technology contents of the present invention, especially exemplified by preferred embodiment and cooperate appended graphic being described as follows.

Please refer to Fig. 1, Figure 1 shows that the process flow diagram of a preferred embodiment of the present invention.From Fig. 1 we as can be seen, the method for the measured automobiles average fuel consumption that the present invention proposes comprises the following steps: step 100: gather the fuel injection pulse signal, mileage umber of pulse and vehicle speed pulse signal; Step 110: obtain fuel consumption according to the fuel injection pulse signal; Step 120: obtain the speed of a motor vehicle and calculate distance travelled according to the vehicle speed pulse signal; Step 130: whether judgment data is in effective computer capacity; Step 140: these data values are carried out first-order lag filtering; Step 150: calculate the average oil consumption that obtains automobile; And step 160: the output of average oil consumption is shown.

Please refer to Fig. 2 again, Figure 2 shows that the instrument of a preferred embodiment of the present invention shows synoptic diagram.

1) shows the average fuel consumption symbol

2) indication range of average fuel consumption is 0.1～99.9L/100km.

3) except 0.0～0.9L/100km, do not show " 0 " of most significant digit.

4) average fuel consumption liquid crystal display renewal frequency is per second 1 time.

5) for the first time be connected to battery or reset after, should show that "--.-L/100km " begins to calculate average fuel consumption up to instrument.

Average fuel consumption AFE (Average Fuel Economy) can calculate by following formula:

$\mathrm{AFE}(L/100\mathrm{km})=\frac{\mathrm{AFE}\_\mathrm{Fuel}\_\mathrm{Used}\left(L\right)}{\text{AFE\_Distance}\left(\mathrm{km}\right)}\×100$

$=\frac{0.000036\left(L\right)\×\mathrm{\ΣAFE}\_\mathrm{Fuel}\_\mathrm{Used}\_\mathrm{Pulse}}{\frac{1}{k}\left(\mathrm{km}\right)\×\mathrm{\ΣAFE}\_\mathrm{Dis}\tan \mathrm{ce}\_\mathrm{Pulse}}\×100$

$=\frac{\mathrm{\ΣAFE}\_\mathrm{Fuel}\_\mathrm{Used}\_\mathrm{Pulse}}{\mathrm{\ΣAFE}\_\mathrm{Dis}\tan \mathrm{ce}\_\mathrm{Pulse}}\×0.0036\×k$

Wherein AFE_Fuel_Used is fuel consumption, it draws through accumulator computes by the fuel injection pulse signal and the mileage umber of pulse of gathering, AFE_Distance is distance travelled, it draws through accumulator computes by the vehicle speed pulse signal and the mileage umber of pulse of gathering, and the k value is every kilometer umber of pulse, automobile is in driving process, because tire is in constantly cutting magnetic induction line (passing through Hall element) meeting generation pulse.Obtain after these data, we need carry out the judgement of data validity, promptly judge above-mentioned fuel consumption value and distance travelled whether in effective computer capacity, when above-mentioned these data are effective, above-mentioned these data values are carried out first-order lag filtering, avoid making that the digital beating heart that shows on the instrument is moving and changing because response speed is too fast, thereby cause certain difficulty when giving driver's observation average fuel consumption information, general is per second 1 time according to above-mentioned average fuel consumption liquid crystal display renewal frequency, more intuitively and not can be when checking the average fuel consumption data message like this owing to numeral changes the too fast too fatigue of eyes that makes, then will relatively calculate the average oil consumption of acquisition automobile through the value of fuel consumption of first-order lag Filtering Processing and distance travelled value according to above-mentioned formula.

The calculating of average fuel consumption should be satisfied following conditions just within effective computer capacity:

1) average fuel consumption begins to calculate when satisfying following all conditions:

A) distance travelled AFE_Distance＞100m (AFE_Min_Distance).

B) speed of a motor vehicle＞0km/h (AFE_Min_Speed).

2) when satisfying following any condition, average fuel consumption should show "--.-L/100km ".

A) distance travelled AFE_Distance≤100m (AFE_Min_Distance).

B) speed of a motor vehicle=0km/h (AFE_Min_Speed).

C) there be not (open circuit or short circuit) in vehicle speed signal.

3) calculating of average fuel consumption should be satisfied per second 4 times.

Fuel consumption AFE_Fuel_Used and distance travelled AFE_Distance algorithm should satisfy:

1) fuel consumption AFE_Fuel_Used and distance travelled AFE_Distance will begin later on to calculate from automotive ignition.

2) fuel consumption AFE_Fuel_Used and distance travelled AFE_Distance draw by separately accumulator computes respectively, the capacity of two totalizers should satisfy:

A) totalizer of fuel consumption AFE_Fuel_Used satisfies 100L (AFE_Fuel_Accum).

B) totalizer of distance travelled AFE_Distance satisfies 1999km (AFE_Distance_Accum).

3) when in two totalizers any one reaches its maximal value, two totalizers should be multiply by 0.5 (AFE_Scale) simultaneously, prevent that data from overflowing the miscount that causes.

4) during the speed of a motor vehicle=0km/h (AFE_Min_Speed), fuel consumption AFE_Fuel_Used and distance travelled AFE_Distance should stop to add up.

After instrument was closed igniting, above-mentioned these data should be saved, shown average fuel consumption zero clearing, and liquid crystal display displays "--.-L/100km " shows when instrument begins to calculate average fuel consumption and promptly lights a fire again closes prefiring average fuel consumption.By after the reset button (more than or equal to 0.8 second) of instrument, above-mentioned data should zero clearing with often, the average fuel consumption zero clearing, liquid crystal display displays "--.-L/100km " begin to calculate average fuel consumption up to instrument.

In sum, the method of the measured automobiles average fuel consumption that the present invention proposes, at first obtain the fuel injection pulse signal, with mileage umber of pulse and vehicle speed pulse signal, and calculate fuel consumption according to them, the speed of a motor vehicle and distance travelled, judge that then these data are whether in effective computer capacity, when data are effective, these data values are carried out first-order lag filtering, calculate the average oil consumption of automobile then, whether effective, the data that guaranteed to calculate average fuel consumption are reliable if can carry out analysis and judgement to input signal according to above-mentioned steps the present invention, the first-order lag filtering that input signal is carried out, the average fuel consumption data that make instrument show can be broken and be beated, and make things convenient for driver's observation average fuel consumption information.

Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.

Claims (7)

1. the method for a measured automobiles average fuel consumption is characterized in that this method comprises the steps:

Gather the fuel injection pulse signal of engine management module output;

Add up according to the data of above-mentioned fuel injection pulse signal and to obtain fuel consumption;

Gather the vehicle speed pulse signal of vehicle speed sensor output;

Go out distance travelled according to above-mentioned vehicle speed pulse signal acquisition vehicle speed data and accumulation calculating;

Judge above-mentioned fuel consumption and distance travelled whether in effective computer capacity;

When above-mentioned these data are effective, above-mentioned these data values are carried out first-order lag filtering;

Relatively calculate through the value of fuel consumption of first-order lag Filtering Processing and distance travelled value above-mentioned, obtain the average oil consumption of automobile;

The wherein above-mentioned value of fuel consumption is saved after the tail-off igniting with distance travelled value, and accumulation calculating is continued in the engine back of lighting a fire again.

2. the method for measured automobiles average fuel consumption according to claim 1, it is characterized in that when above-mentioned vehicle speed value judge when above-mentioned distance travelled is greater than 100m greater than zero-sum above-mentioned speed of a motor vehicle numerical value and distance travelled in effective computer capacity.

3. the method for measured automobiles average fuel consumption according to claim 1 is characterized in that the above-mentioned value of fuel consumption and distance travelled value are drawn by separately accumulator computes respectively.

4. the method for measured automobiles average fuel consumption according to claim 3, the capacity that it is characterized in that the above-mentioned totalizer of fuel consumption is 100L, the capacity of the above-mentioned totalizer of distance travelled is 1999km, when in above-mentioned two totalizers any one reaches max cap., the data of above-mentioned two totalizers be multiply by 0.5 simultaneously.

5. the method for measured automobiles average fuel consumption according to claim 3 is characterized in that above-mentioned two totalizers stop to add up when the speed of a motor vehicle is zero.

6. the method for measured automobiles average fuel consumption according to claim 1 is characterized in that this method more comprises by the liquid crystal electron instrument above-mentioned average oil consumption is shown with digital form.

7. the method for measured automobiles average fuel consumption according to claim 1 is characterized in that this method comprises that more above-mentioned these data zero clearings restart to calculate after pressing reset button.

Images