CN112196641A - Prediction prompting method for driving range of vehicle urea solution - Google Patents
Prediction prompting method for driving range of vehicle urea solution Download PDFInfo
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- CN112196641A CN112196641A CN202011078573.8A CN202011078573A CN112196641A CN 112196641 A CN112196641 A CN 112196641A CN 202011078573 A CN202011078573 A CN 202011078573A CN 112196641 A CN112196641 A CN 112196641A
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- urea solution
- urea
- mileage
- vehicle
- fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W2050/143—Alarm means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses a prediction and prompt method for the vehicle urea solution driving range, which is characterized in that in the normal driving process of a vehicle, the fuel quantity driving range and the urea solution quantity driving range are respectively calculated by simultaneously extracting the average fuel consumption and the average urea consumption, and the current oil tank oil quantity and the urea solution quantity of a vehicle. When the driving range of the urea solution amount is lower than the driving range of the fuel amount and the difference value reaches a certain degree, a driver or a vehicle owner is prompted to remind a user of filling enough urea solution, so that the limitation of vehicle driving caused by insufficient urea solution amount in the vehicle driving process is avoided.
Description
Technical Field
The invention belongs to the technology of diesel vehicle emission post-treatment, and particularly relates to a prediction prompting method for the driving range of a vehicle urea solution.
Background
With the continuous development and growth of automobile industry in China, the market share of commercial vehicles is also continuously promoted, and the demand and delivery of diesel engines serving as main power sources of the commercial vehicles are also increased year by year. The diesel engine has sufficient discharge capacity, excellent dynamic property and excellent fuel economy, simultaneously has high pollution to the environment, becomes the problem to be solved urgently in the vehicle emission control in China, and in order to realize the purpose of reducing pollution in the working process of the diesel engine, a reduction measure commonly adopted by manufacturers is an SCR technical route.
Selective Catalytic Reduction, SCR for short, is a technical principle of using urea solution as a reducing agent to selectively reduce nitrogen oxides in an oxygen-rich environment to generate nitrogen and water under the action of a catalyst. The urea injection in SCR adopts a closed-loop injection strategy to realize the injection control in the steady-state and transient processes of the engine, and the urea injection quantity is adjusted and optimized through the operating parameters of the engine, such as the rotating speed, the fuel injection quantity, the exhaust flow, the exhaust temperature and the like.
When the diesel engine runs, the engine can continuously discharge exhaust gas, and meanwhile, the SCR system can also spray urea solution into the exhaust pipeline to perform oxidation-reduction reaction with the exhaust gas discharged by the engine so as to remove nitrogen and oxidize the exhaust gas, thereby reducing the pollution of the exhaust gas.
Conventionally, the remaining fuel quantity and the average fuel consumption are the only determination standards for determining the allowable remaining driving mileage of a vehicle, and the latest national six standards also make relevant standards for the remaining amount of the vehicle urea solution:
when the urea liquid level is less than 10% of the urea tank capacity, the vehicle will send out an alarm signal.
When the urea level is below 2.5% of the full scale of the urea tank (different factory-calibrated thresholds may be slightly different), the primary driving inducement system is activated.
The critical driving inducement system is activated when the urea tank is empty or the liquid level is below a manufacturer specified lower limit (e.g. below 2.5% of full scale).
And the alarm system is closed only when the urea solution is added to reach the fault removing liquid level.
The fuel gauge is arranged on an instrument panel of the existing vehicle, and the average fuel consumption and the residual fuel quantity can be displayed on the fuel gauge of some vehicle types so as to inform the mileage which can be supported by the residual fuel, but the fuel gauge has larger limitations and defects. When the driver can only determine the driving range through the fuel gauge and the lack of knowledge of the residual amount of the urea solution in the SCR system can possibly cause the urea solution to be used for carrying out oxidation-reduction reaction with the exhaust gas even if the fuel is sufficient. At this time, the On-Board diagnostics (OBD) system recognizes that the SCR system of the vehicle does not have a urea solution available for injection, and the engine performance is limited (speed limit/torque limit, etc.), which affects the safe operation of the vehicle and reduces the working efficiency of the vehicle.
Disclosure of Invention
The invention aims to solve the technical problem of providing a prediction prompting method for the driving range of a vehicle urea solution, which can effectively predict the actual allowable range of the vehicle according to the consumption of fuel oil and the urea solution so as to remind a driver to supplement the urea solution in time and ensure the driving performance and the driving safety.
In order to solve the technical problems, the invention adopts the following technical scheme:
a prediction prompting method for the driving range of a vehicle urea solution comprises the following steps:
a. extracting the consumption of fuel oil and urea solution within a certain driving distance when the automobile normally drives;
b. b, respectively calculating the driving mileage allowed by the allowance of the fuel oil and the urea solution according to the consumption in the step a;
c. and comparing the calculated fuel oil with the allowable mileage of the residual amount of the urea solution to judge the actual allowable mileage of the vehicle so as to remind a driver of replenishing the urea solution in time.
In step b, the allowable mileage L of the remaining urea solutionaThe calculation formula of (2) is as follows: xa＝ΔVa/ΔL，La＝Va/XaIn the formula:
Xaaverage urea consumption per unit mileage is calculated;
ΔVathe consumption of urea in a urea box is a certain distance delta L of normal driving of the automobile;
Vais the rest of the urea solution in the urea box.
In step b, the allowable mileage L of the fuelfThe calculation formula of (2) is as follows: xf＝ΔVf/ΔL，Lf＝Vf/XfIn the formula:
Xfaverage fuel consumption for the unit mileage;
ΔVfthe consumption of fuel oil in an oil tank is the consumption of fuel oil in the oil tank when the automobile normally runs for a certain mileage delta L;
Vfis the residual fuel in the fuel tank.
In step c, the comparison method is as follows:
when L isa＞K·LfJudging that the residual amount of the urea solution in the urea box is enough to support the mileage of the whole consumed fuel oil;
when L isa≤K·LfWhen the running mileage is judged to be insufficient, the remaining amount of the urea solution in the urea box is judged to possibly support the running mileage of the fuel oil of the urea box, and an alarm is given to remind a driver to supplement the urea in time so as to ensure the running performance and the safety;
in the above formula, K is a margin coefficient of the vehicle type.
The value of K is 1.1.
By adopting the prediction and prompting method for the vehicle urea solution driving range, the fuel oil quantity driving range and the urea solution quantity driving range are respectively calculated by simultaneously extracting the average fuel oil consumption and the average urea consumption, and the current oil tank oil quantity of the vehicle and the urea solution quantity of the urea tank. When the driving range of the urea solution amount is lower than the driving range of the fuel amount and the difference value reaches a certain degree, a driver or a vehicle owner is prompted to remind a user of filling enough urea solution, so that the limitation of vehicle driving caused by insufficient urea solution amount in the vehicle driving process is avoided.
Detailed Description
The invention discloses a prediction prompting method of vehicle urea solution driving range, which mainly comprises the following steps: the consumption of fuel oil and urea solution within a certain mileage is collected and extracted, the average value and the allowance of the consumption are analyzed to obtain the remaining mileage allowed by the vehicle based on two required solutions, the mileage allowed by the urea allowance and the mileage allowed by the fuel oil allowance are compared, a driver is reminded to add the urea in time according to the comparison result, and the driving performance and the driving safety are guaranteed.
The specific principle of the existing diesel vehicle is that the fuel consumption in a certain mileage is calculated to obtain the average fuel consumption per kilometer, and then the fuel residual mileage is calculated by the sum of the internal capacity of the fuel tank and one of the internal capacity of the fuel tank.
The invention adopts the calculation of the mileage allowed by the fuel allowance and adds the calculation process of the mileage allowed by the urea allowance, and the specific principle is that the urea consumption within a certain mileage is calculated, the average urea solution consumption per kilometer is obtained, the mileage allowed by the urea allowance is calculated by the internal volume of the urea tank and one of the internal volume of the urea tank, the mileage allowed by the urea allowance is compared with the mileage allowed by the fuel allowance, and when the mileage allowed by the urea allowance is smaller than the mileage allowed by the fuel allowance, the system gives an alarm to remind a driver to replenish urea in time.
Because the driving condition of the automobile is complex, the consumption of the fuel oil and the urea solution in a certain mileage is not necessarily accurate, a certain margin is introduced in the calculation and comparison for smoothing the uncertain value, namely when the driving mileage of the urea solution is lower than the driving mileage of the fuel oil and the difference value reaches a certain degree, a driver or an owner is prompted, for example, the mileage allowed by the urea residual is less than 1.1 times the mileage allowed by the fuel oil residual, the residual amount of the urea solution in the urea tank is possibly not enough to support the driving mileage of the whole consumed fuel oil, and the alarm system is started to remind the driver to supplement the urea solution in time so as to ensure that the driving of the automobile is not limited due to the insufficient amount of the urea solution in the driving process of the automobile.
Firstly, a number of parameters are involved in the detection of the remaining mileage allowed by the amount of urea solution in a vehicle and the issuing of an alarm, the following parameters being briefly described:
ΔVfthe consumption (volume) of fuel oil in an oil tank is the consumption (volume) of the fuel oil tank when the automobile normally runs for a certain mileage Delta L;
Xfto pass through Δ VfCalculating the average fuel consumption (volume) per unit mileage with the delta L;
Lffor the residual fuel quantity V of the fuel tankfAllowed mileage
ΔVaThe consumption (volume) of the urea in the urea box is a certain mileage delta L for the normal running of the automobile
XaTo pass through Δ VaAverage urea consumption per mileage (volume) calculated from Δ L
LaThe amount V of the residual urea solution in the urea tankaThe allowed remaining range;
k is the margin coefficient of the vehicle
In order to obtain the remaining driving mileage allowed by the urea solution amount of the vehicle and remind a driver of replenishing urea in time, the specific prediction prompting method provided by the invention comprises the following steps:
extracting fuel consumption delta V before and after a driving range delta L process when an automobile normally drivesfWith urea solution consumption Δ VaAt this time, the driving mileage allowed by the remaining amount of fuel and urea is specifically analyzed:
mileage allowed by fuel remaining:
calculating average fuel oil consumption X of unit mileagef＝ΔVf/ΔL
Secondly, the fuel oil surplus V in the fuel oil tank at the moment is obtained by a fuel oil tank liquid level meterf
Calculating the driving mileage L allowed by the residual fuel quantity of the fuel tankf＝Vf/Xf
Driving mileage allowed by the remaining amount of urea solution:
calculating average urea solution consumption X of unit mileagea＝ΔVa/ΔL
Obtaining the residual amount V of the urea solution in the oil tank at the moment by an oil tank liquid level metera
Thirdly, calculating the driving mileage L allowed by the residual urea solution amount in the urea tanka＝Va/Xa
The evaluation is thus made by means of the margin factor K:
when L isa＞K·LfAnd in the process, the residual amount of the urea solution in the urea box is enough to support the mileage of the whole consumed fuel, the system does not remind, and a driver can observe the fuel gauge.
When L isa≤K·LfIn the process, the residual amount of the urea solution in the urea box may not be enough to support the mileage of the whole consumed fuel, and at the moment, the system gives an alarm to remind a driver of replenishing urea in time so as to ensure the driving performance and safety.
Taking a common diesel vehicle in the market as an example, assuming that the vehicle model margin coefficient K is 1.1, three vehicles A, B, C of the vehicle model are selected as detection samples for detection:
a: the method is used for recording the fuel consumption delta V before and after the process that the A vehicle normally runs for a certain mileage delta L-50 kmAf8.684L, urea solution consumption Δ VAa＝0.422L
1. Calculating the allowable mileage of the fuel allowance:
calculating average fuel oil consumption X of unit mileageAf＝ΔVAf/ΔL＝8.684/50＝0.1737L/km
Secondly, the fuel oil surplus V in the fuel oil tank at the moment is obtained by a fuel oil tank liquid level meterAf＝75L
Calculating the driving mileage L allowed by the residual fuel quantity of the fuel tankAf＝VAf/XAf＝431.78km
2. Calculating the allowable mileage of the urea solution:
calculating average urea solution consumption X of unit mileageAa＝ΔVAa/ΔL＝0.00844L/km
Obtaining the residual amount V of the urea solution in the urea box by a liquid level meter of the urea boxAa＝5L
Thirdly, calculating the driving mileage L allowed by the residual urea solution amount in the urea tankAa＝VAa/XAa＝592.42km
3. Introducing a margin coefficient K for comparison calculation
592.42 > 1.1X 431.78, i.e. LAa＞K·LAfAt the moment, the residual amount of the urea solution in the urea box is enough to support the mileage of the whole consumed fuel, and the system does not remind.
B: the fuel consumption delta V before and after the process that the B vehicle normally runs for a certain mileage delta L-50 km is recorded by the same methodBfWith urea solution consumption Δ VBa
Calculated LBf＝329.96km，LBa345.62km, although L is easily obtained in this caseBa＞LBfHowever, for safety, a margin coefficient K is introduced for comparison calculation
345.62＜1.1×329.96
Namely LBa＜K·LBfAt the moment, the residual amount of the urea solution in the urea tank is possibly not enough to support the mileage of the whole consumed fuel, and the system gives an alarm to remind a driver of replenishing urea in time.
C: the fuel consumption delta V before and after the process that the C vehicle normally runs for a certain mileage delta L-50 km is recorded by the same methodCfWith urea solution consumption Δ VCa
Calculated LCf＝209.88km，LCaIntroducing a margin coefficient K for comparison calculation to obtain 129.65km
129.65＜1.1×209.88
Namely LBa＜K·LBfAt the moment, the residual amount of the urea solution in the urea box is obviously insufficient to support the mileage of the whole consumed fuel, and the system gives an alarm to remind a driver of replenishing urea in time.
It should be noted that the margin coefficient K is only a corresponding margin coefficient for a vehicle type used in the embodiment, different vehicle types have different working conditions, consumption ratios of fuel oil and urea are also different, and a value of 1.1 is not a universal coefficient, and is only referred to as an example.
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.
Claims (5)
1. A prediction prompting method for the driving range of a vehicle urea solution is characterized by comprising the following steps:
a. extracting the consumption of fuel oil and urea solution within a certain driving distance when the automobile normally drives;
b. b, respectively calculating the driving mileage allowed by the allowance of the fuel oil and the urea solution according to the consumption in the step a;
c. and comparing the calculated fuel oil with the allowable mileage of the residual amount of the urea solution to judge the actual allowable mileage of the vehicle so as to remind a driver of replenishing the urea solution in time.
2. The method for predicting and prompting the driving range of the vehicle urea solution according to claim 1, wherein the method comprises the following steps: in step b, the allowable mileage L of the remaining urea solutionaThe calculation formula of (2) is as follows: xa＝ΔVa/ΔL，La＝Va/XaIn the formula:
Xaaverage urea consumption per unit mileage is calculated;
ΔVathe consumption of urea in a urea box is a certain distance delta L of normal driving of the automobile;
Vais the rest of the urea solution in the urea box.
3. The method for predicting the driving range of the vehicle urea solution according to claim 1 or 2, wherein: in step b, the allowable mileage L of the fuelfThe calculation formula of (2) is as follows: xf＝ΔVf/ΔL，Lf＝Vf/XfIn the formula:
Xfaverage fuel consumption for the unit mileage;
ΔVfthe consumption of fuel oil in an oil tank is the consumption of fuel oil in the oil tank when the automobile normally runs for a certain mileage delta L;
Vfis the residual fuel in the fuel tank.
4. The method for predicting and prompting the driving range of the vehicle urea solution according to claim 3, wherein the method comprises the following steps: in step c, the comparison method is as follows:
when L isa＞K·LfJudging that the residual amount of the urea solution in the urea box is enough to support the mileage of the whole consumed fuel oil;
when L isa≤K·LfWhen the running mileage is judged to be insufficient, the remaining amount of the urea solution in the urea box is judged to possibly support the running mileage of the fuel oil of the urea box, and an alarm is given to remind a driver to supplement the urea in time so as to ensure the running performance and the safety;
in the above formula, K is a margin coefficient of the vehicle type.
5. The method for predicting and prompting the driving range of the vehicle urea solution according to claim 4, wherein the method comprises the following steps: the value of K is 1.1.
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| CN113187589A (en) * | 2021-04-29 | 2021-07-30 | 潍柴动力股份有限公司 | Method and device for using residual amount of urea in urea box |
| CN114115235A (en) * | 2021-10-28 | 2022-03-01 | 创泽智能机器人集团股份有限公司 | Disinfectant supplementing method, device and medium for disinfecting robot |
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Application publication date: 20210108 |