CN111780828B - Method for calculating actual fuel percentage of fuel tank - Google Patents
Method for calculating actual fuel percentage of fuel tank Download PDFInfo
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- CN111780828B CN111780828B CN202010559022.7A CN202010559022A CN111780828B CN 111780828 B CN111780828 B CN 111780828B CN 202010559022 A CN202010559022 A CN 202010559022A CN 111780828 B CN111780828 B CN 111780828B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
-
- 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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/0321—Fuel tanks characterised by special sensors, the mounting thereof
- B60K2015/03217—Fuel level sensors
Abstract
The invention relates to the technical field of methods for calculating the fuel quantity of an automobile fuel tank, in particular to a method for calculating the actual fuel percentage of a fuel tank. When the fuel quantity Temp4 of the fuel tank detected by the fuel quantity sensor of the automobile is larger than the critical value B, the fuel quantity value A in the fuel tank after the refueling and the actual fuel quantity B in the fuel tank in the current driving cycle are estimated, and the actual fuel percentage P of the fuel tank is calculated according to A and Bfuellevel(ii) a The critical value b is a set value which is smaller than the oil quantity value a at the full stop position of the oil quantity sensor and is larger than the oil quantity value c at the full grid position of the oil quantity sensor; the refueling refers to a fuel adding process from refueling of a fuel tank to automatic gun jumping. The method estimates the extra fuel quantity value exceeding the full stop position of the fuel quantity sensor after each refueling, can more accurately reflect the actual fuel quantity condition in the fuel tank compared with the prior art, and sequentially calculates the actual fuel percentage of the fuel tank, so that the condition that the fuel percentage is continuously maintained at 100 percent can not occur, and the fuel condition can be more accurately reflected.
Description
Technical Field
The invention relates to the technical field of methods for calculating the fuel quantity of an automobile fuel tank, in particular to a method for calculating the actual fuel percentage of a fuel tank.
Background
An automobile fuel oil tank is generally provided with an oil quantity sensor, a controller receives a signal value of the oil quantity sensor, a read signal is converted into the oil quantity of the oil tank according to the characteristics of the sensor, and then the oil quantity is fed back to an automobile instrument for oil quantity display.
The fuel quantity calculation directly influences the subjective feeling of a driver, and particularly, when the control is inaccurate at critical points, such as a maximum fuel quantity position, a minimum fuel quantity position and vehicle running fluctuation, the fuel quantity display is influenced. The oil tank volume and the oil quantity sensor have certain deviation, and a certain volume space exists beyond the measuring range of the oil quantity sensor. If the fuel is filled beyond the range of the fuel quantity sensor but not beyond the maximum volume of the fuel tank, the phenomenon that the pointer of the meter does not drop when the vehicle runs for a long time can occur, the reason is that the fuel consumption is the fuel quantity beyond the fuel quantity sensor in the running process, the fuel meter display always is a full grid, the general algorithm of the meter display is that the fuel quantity drops to below 90% and then drops to a grid, and if the extra fuel quantity beyond the range of the fuel quantity sensor is too much, the situation that the vehicle runs for hundreds of kilometers can occur. If the oil quantity outside the measuring range of the oil quantity sensor can be estimated and the percentage of the oil quantity is calculated, the current oil quantity can be accurately displayed, the display of the meter can be reduced as soon as possible, and the influence on a driver can be avoided.
Disclosure of Invention
The invention aims to solve the technical problems mentioned in the background technology and provide a method for calculating the actual fuel percentage of a fuel tank.
The technical scheme of the invention is as follows: a method for calculating the actual fuel percentage of a fuel tank is characterized by comprising the following steps: when the fuel quantity Temp4 of the fuel tank detected by the fuel quantity sensor of the automobile is larger than the critical value B, the fuel quantity value A in the fuel tank after the refueling and the actual fuel quantity B in the fuel tank in the current driving cycle are estimated, and the actual fuel percentage P of the fuel tank is calculated according to A and Bfuellevel(ii) a The critical value b is a set value which is smaller than the oil quantity value a at the full stop position of the oil quantity sensor and is larger than the oil quantity value c at the full grid position of the oil quantity sensor; the refueling refers to a fuel adding process from refueling of a fuel tank to automatic gun jumping.
Further based on the fuel level sensor full position fuel level value a and the extra fuel level learned value Temp3 stored in ROM after the last refuelingn-1Estimating the oil mass value A in the oil tank after the oiling; the last refueled extra fuel amount learned value Temp3n-1The set oil mass value exceeding the oil mass value a at the full stop position of the oil mass sensor in the oil tank after the last oiling is carried out; n being indicative of the number of refuellingNatural number, and n is more than or equal to 2.
Further learning the value Temp3 according to the extra fuel amount after the last refuelingn-1Estimating the fuel quantity value a at the full stop position of the fuel quantity sensor and accumulating the fuel consumption Temp2 after the refuelingnAnd estimating the current actual fuel quantity B of the fuel tank.
Further actual fuel percentage PfuellevelThe calculation method comprises the following steps:
wherein: pfuellevel-actual fuel percentage;
Temp3n-1-the last refueled extra fuel learn value;
Temp2n-accumulating fuel consumption after the refueling;
a-oil quantity value at full stop position of oil quantity sensor;
C1-maximum value of the extra fuel quantity learning value allowed in the fuel tank;
a is the estimated value of the oil quantity in the oil tank after the oil is added;
and B is the estimated value of the oil quantity of the current oil tank after the oil is filled at this time.
Further, when n is more than or equal to 3, the extra fuel amount learning value Temp3 stored in ROM after the last refuelingn-1The calculation method comprises the following steps:
wherein: temp3n-1-the last refueled extra fuel learn value;
Temp2n-1-accumulating fuel consumption after last refuelling;
Temp3n-2-the learned value of the amount of additional fuel after last refueling;
a-oil quantity value at full stop position of oil quantity sensor;
c is the oil quantity value at the full grid position of the oil quantity sensor;
C2-maximum step size of extra fuel quantity learn value correction.
Further, when n is 2, that is, the extra fuel amount learned value Temp3 after the first fueling1The setting value is between 10L and 15L.
Further, when the fuel quantity Temp4 of the fuel tank detected by the fuel quantity sensor of the automobile is less than or equal to a critical value b, taking Temp4 as the current actual fuel quantity in the fuel tank; actual fuel percentage PfuellevelThe calculation method comprises the following steps:
wherein: pfuellevel-actual fuel percentage;
temp4 — fuel tank level detected by fuel level sensor;
a-oil quantity value at full stop position of oil quantity sensor;
Temp3n-1-the last refueled extra fuel learn value;
C1-maximum value of extra fuel quantity learning value allowed in the fuel tank.
After the current oil quantity Temp4 in the oil tank is read by a further oil quantity sensor, the oil quantity sensor needs to be electrically diagnosed and rationalized, and if the diagnosis result proves that the oil quantity sensor has no fault, the actual fuel percentage P is carried outfuellevelCalculating (1); and if the diagnosis result shows that the oil quantity sensor has a fault, reading the current oil quantity Temp4 in the oil tank again for judgment.
The method for electrically diagnosing the oil quantity sensor further comprises the following steps: reading a voltage signal of the oil mass sensor, and judging that an electrical fault exists when the voltage value of the sensor exceeds a set limit value or is lower than the set limit value;
the method for carrying out rationality diagnosis on the oil quantity sensor comprises the following steps: collecting the accumulated fuel consumption Temp2 after the refuelingnIf Temp2nGreater than the maximum volume of the calibrated fuel tank and the driving cycleIf no oiling signal exists, the oil mass sensor is considered to be in fault; otherwise, the oil quantity sensor is proved to be normal.
Further, when the Temp4 detected by the fuel sensor gradually decreases from b to less than c with the consumption of the fuel of the automobile, the fuel quantity learning flag Temp1 is set to 0, and the extra fuel quantity learning value Temp3 after the current refueling is startednAccording to the accumulated fuel consumption Temp2 after the refuelingnThe oil quantity value a at the full stop position of the oil quantity sensor, the oil quantity value c at the full grid position of the oil quantity sensor and the extra oil quantity learning value Temp3 after last oilingn-1Calculate Temp3nTemp3nStored in the ROM for subsequent calculation, and after completion, the oil amount learning flag Temp1 is set to 1 and stored in the ROM.
The method estimates the extra fuel quantity value exceeding the full stop position of the fuel quantity sensor after each refueling, can more accurately reflect the actual fuel quantity condition in the fuel tank and sequentially calculate the actual fuel percentage of the fuel tank compared with the prior art, so that the condition that the fuel percentage is continuously maintained at 100 percent can not occur, the fuel condition can be more accurately reflected, and the method has great popularization value.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The embodiment estimates the extra fuel amount exceeding the fuel amount value a (the full stop position in the fuel amount sensor specification) of the full stop position of the fuel amount sensor after each refueling (the refueling of the embodiment refers to the fuel adding process of the fuel tank refueling to the automatic gun jump, and the actual fuel amount in the fuel tank is larger than the fuel amount value a of the full stop position of the fuel amount sensor when the fuel tank refuels to the automatic gun jump), so as to obtain the fuel amount of the refueled fuel tank, and then estimate the actual fuel amount of the fuel tank, wherein the ratio of the two is the actual fuel percentage of the current fuel tank. The oil quantity value at the full grid position of the oil quantity sensor is c (full grid position in the specification of the oil quantity sensor), the oil quantity value at the full grid position of the oil quantity sensor is a (a is larger than c), the set critical value b of the embodiment is a set value between a and c, the set value is set according to the condition of an automobile oil tank, and the critical value b can be obtained in a calibration mode. The fuel quantity sensor can accurately measure the fuel quantity in the fuel tank when the fuel quantity of the fuel tank is within the range of 0-b, and the fuel quantity sensor cannot accurately detect the fuel quantity value in the fuel tank when the fuel quantity of the fuel tank is larger than b, so that the extra fuel quantity value exceeding the fuel quantity value a of the full stop position of the fuel quantity sensor in the fuel tank needs to be estimated, and then the actual fuel percentage of the fuel tank is calculated.
When the oil quantity sensor detects the oil quantity value Temp4 of the oil tank in a certain driving cycle, after the detection is finished, fault judgment is carried out on the oil quantity sensor, and the fault judgment is divided into electrical fault judgment and rationality fault judgment. The electrical fault judgment is carried out by reading a voltage signal of the oil quantity sensor, and when the voltage value of the oil quantity sensor is not within a set limit value range, the oil quantity sensor can be judged to have an electrical fault. The rationality fault judgment method is to collect the accumulated fuel consumption Temp2 after the refuelingnIf the accumulated fuel consumption is greater than the maximum volume of fuel (a greater value may be used depending on the calibration quantity obtained from the fuel tank). The oil quantity sensor is proved to be stuck in a certain interval or a certain physical point, and a fault exists; otherwise, the oil quantity sensor is proved to be normal.
If the fuel quantity sensor has no fault, starting to compare Temp4 with a critical value b, and when the fuel quantity value Temp4 detected by the fuel quantity sensor is greater than the critical value b, calculating the actual fuel percentage according to the following formula I:
wherein: pfuellevel-actual fuel percentage;
temp4 — fuel tank level detected by fuel level sensor;
Temp3n-1-the last refueled extra fuel learn value;
Temp2n-accumulating fuel consumption after the refueling;
a-oil quantity value at full stop position of oil quantity sensor;
C1-maximum value of the extra fuel quantity learning value allowed in the fuel tank;
min is the minimum of two numbers in parentheses.
Wherein Temp3n-1Is the extra fuel amount learning value after last refueling, and can be according to the extra fuel amount learning value Temp3 after last refuelingn-2The calculation is carried out according to the following formula II:
wherein: temp3n-1-the last refueled extra fuel learn value;
Temp2n-1-accumulating fuel consumption after last refuelling;
Temp3n-2-the learned value of the amount of additional fuel after last refueling;
a-oil quantity value at full stop position of oil quantity sensor;
c is the oil quantity value at the full grid position of the oil quantity sensor;
C2the maximum step length of the correction of the extra fuel quantity learning value is set to avoid the extra fuel quantity learning value deviation caused by overlarge correction of the extra fuel quantity learning value;
abs is the absolute value of the equation in parentheses.
The above calculation is based on n ≧ 3, and when n ≧ 2, i.e., the extra-fuel amount learned value Temp3 for the first drive cycle1The set value is a set value between 10 and 15, and the set value can be calibrated according to the condition of an oil tank of the automobile.
Temp2 of the present embodimentnThe fuel consumption is accumulated after the refueling, and can be acquired according to the acquisition of an automobile controller and is a known value. Temp2nThe collection is started after the refueling signal appears, namely Temp2 is carried out after another refueling signal appearsnThe reset begins the recalculation.
The fueling signal of the present embodiment is performed as followsAnd (3) judging: when the vehicle is in a static state, subtracting the fuel level stored when the vehicle is static last time from the fuel Temp4 of the fuel tank detected by the fuel sensor, and being greater than a calibration limit value, for example, the calibration limit value is set to 4L, judging that the driving cycle has a refueling operation, for example, the fuel stored when the vehicle is static last time is 25L, the fuel monitored when the vehicle is static this time is 40L, the difference value between the fuel and the fuel last time is 15L, and is greater than the calibration limit value, judging that the refueling operation exists, setting a refueling signal to be 1, and when the refueling signal is 1, setting the Temp2nA reset is performed to start the recalculation.
If the fuel quantity sensor has no fault, when the fuel quantity value Temp4 detected by the fuel quantity sensor is less than or equal to the critical value b, the calculation of the actual fuel percentage can be carried out according to the following formula three:
wherein: pfuellevel-actual fuel percentage;
temp4 — fuel tank level detected by fuel level sensor;
a-oil quantity value at full stop position of oil quantity sensor;
Temp3n-1-the last refueled extra fuel learn value;
C1-maximum value of extra fuel quantity learning value allowed in the fuel tank.
When the fuel quantity value Temp4 detected by the fuel quantity sensor is less than or equal to the critical value b, the fuel quantity sensor can accurately detect the fuel quantity condition in the fuel tank at the moment, and an estimation is not needed.
When the fuel quantity in the fuel tank is consumed from the critical value b to the fuel quantity value c smaller than the full grid position of the fuel quantity sensor along with the consumption of the fuel in the fuel tank, the fuel quantity learning mark Temp1 is set to be 0, and the extra fuel quantity learning value Temp3 is started according to the formula twonAccording to the accumulated fuel consumption Temp2 after the refuelingnA, the oil quantity value c of the full grid position of the oil quantity sensor and the additional oil quantity learning value Temp3 after last oilingn-1Calculate Temp3nTemp3nStored in the ROM for subsequent calculation, and the oil amount learning flag Temp1 is set to 1 after completion and stored in the ROM to facilitate calculation of the extra oil amount learning value for the next driving cycle.
The present invention is described in detail below with specific examples: in this embodiment, a certain type of oil sensor is selected, the oil amount at full position C of the oil sensor is 40.7L, the oil amount at full stop position a is 43.2L, the critical value b is 42.7L, and C is set1It was 13.3L.
When an automobile loaded with the fuel quantity sensor runs, Temp4 detected by the fuel quantity sensor is 43L and is larger than a critical value b, the fuel quantity sensor is judged to be free of faults, the accumulated fuel consumption after refueling is acquired to be 3L through a controller, the driving cycle is the second refueling, the extra fuel learning value after the first refueling is given as an initial value of 10.3L, the extra fuel learning value after refueling is calculated to be 9.3L according to a formula II, the fuel percentage calculation is started according to the formula I, and the calculation result is 94%.
If the actual fuel percentage is not calculated in the embodiment, the fuel percentage displayed on the fuel gauge is 100%, since the extra fuel learning value is 9.3L, which is equivalent to the fuel amount exceeding the fuel amount value at the full-stop position of the fuel sensor at this time, and the fuel consumption of 9.3L may need several hundred kilometers, in this process, the fuel gauge always displays 100%, which is obviously inaccurate and inappropriate.
The driving cycle of the present embodiment refers to the cycle from ignition of the automobile engine to the flameout of the automobile engine.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for calculating the actual fuel percentage of a fuel tank is characterized by comprising the following steps: when the fuel quantity Temp4 of the fuel tank detected by the fuel quantity sensor of the automobile is larger than the critical value B, the fuel quantity value A in the fuel tank after the refueling and the actual fuel quantity B in the fuel tank in the current driving cycle are estimated, and the actual fuel percentage P of the fuel tank is calculated according to A and Bfuellevel(ii) a The critical value b is a set value which is smaller than the oil quantity value a at the full stop position of the oil quantity sensor and is larger than the oil quantity value c at the full grid position of the oil quantity sensor; the refueling refers to a fuel adding process from refueling of a fuel tank to automatic gun jumping;
the fuel quantity value a is determined according to the full stop position of the fuel quantity sensor and the additional fuel quantity learning value Temp3 stored in the ROM after the last fuel fillingn-1Estimating the oil mass value A in the oil tank after the oiling; the last refueled extra fuel amount learned value Temp3n-1The set oil mass value exceeding the oil mass value a at the full stop position of the oil mass sensor in the oil tank after the last oiling is carried out; n is a natural number representing the oiling times, and n is more than or equal to 2;
learning value Temp3 according to the extra fuel amount after last refuelingn-1Estimating the fuel quantity value a at the full stop position of the fuel quantity sensor and accumulating the fuel consumption Temp2 after the refuelingnEstimating the actual oil quantity B of the current oil tank;
actual fuel percentage PfuellevelThe calculation method comprises the following steps:
wherein: pfuellevel-actual fuel percentage;
Temp3n-1-the last refueled extra fuel learn value;
Temp2n-accumulating fuel consumption after the refueling;
a-oil quantity value at full stop position of oil quantity sensor;
C1-maximum value of the extra fuel quantity learning value allowed in the fuel tank;
a is the estimated value of the oil quantity in the oil tank after the oil is added;
b is the estimated value of the oil quantity of the current oil tank after the oil is added;
when n is more than or equal to 3, the extra fuel amount learning value Temp3 stored in the ROM after the last refuelingn-1The calculation method comprises the following steps:
wherein: temp3n-1-the last refueled extra fuel learn value;
Temp2n-1-accumulating fuel consumption after last refuelling;
Temp3n-2-the learned value of the amount of additional fuel after last refueling;
a-oil quantity value at full stop position of oil quantity sensor;
c is the oil quantity value at the full grid position of the oil quantity sensor;
C2-maximum step size of extra fuel quantity learn value correction;
when n is 2, i.e., the extra fuel amount learned value Temp3 after the first fueling1The setting value is between 10 and 15.
2. A method of calculating the percentage of actual fuel in a fuel tank as claimed in claim 1, wherein: when the fuel quantity Temp4 of a fuel tank detected by a fuel quantity sensor of the automobile is less than or equal to a critical value b, taking Temp4 as the current actual fuel quantity in the fuel tank; actual fuel percentage PfuellevelThe calculation method comprises the following steps:
wherein: pfuellevel-actual fuel percentage;
temp4 — fuel tank level detected by fuel level sensor;
a-oil quantity value at full stop position of oil quantity sensor;
Temp3n-1-the last refueled extra fuel learn value;
C1-maximum value of extra fuel quantity learning value allowed in the fuel tank.
3. A method of calculating the percentage of actual fuel in a fuel tank as claimed in claim 1 or claim 2, wherein: after the oil quantity sensor reads the current oil quantity Temp4 in the oil tank, the oil quantity sensor needs to be electrically diagnosed and rationalized, if the diagnosis result proves that the oil quantity sensor has no fault, the actual fuel percentage P is carried outfuellevelCalculating (1); and if the diagnosis structure shows that the oil quantity sensor has a fault, reading the current oil quantity Temp4 in the oil tank again for judgment.
4. A method of calculating the percentage of actual fuel in a fuel tank as claimed in claim 3, wherein: the method for electrically diagnosing the oil quantity sensor comprises the following steps: reading a voltage signal of the oil mass sensor, and judging that an electrical fault exists when the voltage value of the sensor exceeds a set limit value or is lower than the set limit value;
the method for carrying out rationality diagnosis on the oil quantity sensor comprises the following steps: collecting the accumulated fuel consumption Temp2 after the refuelingnIf Temp2nIf the volume of the fuel tank is larger than the calibrated maximum volume of the fuel tank and the driving cycle does not have a fuel filling signal, the fuel quantity sensor is considered to be in fault; otherwise, the oil quantity sensor is proved to be normal.
5. A method of calculating the percentage of actual fuel in a fuel tank as claimed in claim 1, wherein: when the Temp4 detected by the fuel sensor is gradually reduced from b to less than c along with the fuel consumption of the automobile, the fuel quantity learning flag Temp1 is set to 0, and the extra fuel quantity learning value Temp3 after the current refueling is startednAccording to the accumulated fuel consumption Temp2 after the refuelingnThe oil quantity value a at the full stop position of the oil quantity sensor, the oil quantity value c at the full grid position of the oil quantity sensor and the extra oil quantity learning value Temp3 after last oilingn-1Calculate Temp3nTemp3nStored in the ROM for subsequent calculation, and after completion, the oil amount learning flag Temp1 is set to 1 and stored in the ROM.
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