CN115949519B - Fuel evaporation diagnosis control method and system based on target path and vehicle - Google Patents
Fuel evaporation diagnosis control method and system based on target path and vehicle Download PDFInfo
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- CN115949519B CN115949519B CN202310000238.3A CN202310000238A CN115949519B CN 115949519 B CN115949519 B CN 115949519B CN 202310000238 A CN202310000238 A CN 202310000238A CN 115949519 B CN115949519 B CN 115949519B
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 138
- 239000000446 fuel Substances 0.000 title claims abstract description 129
- 230000008020 evaporation Effects 0.000 title claims abstract description 121
- 238000001704 evaporation Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000009825 accumulation Methods 0.000 claims abstract description 14
- 238000012163 sequencing technique Methods 0.000 claims description 2
- 238000002405 diagnostic procedure Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 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
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- Combined Controls Of Internal Combustion Engines (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
The invention discloses a fuel evaporation diagnosis control method, a system and a vehicle based on a target path, which acquire navigation information based on the target path between a starting point and a destination according to the current position information of the starting point and the position information of the destination input by a user; determining a fuel evaporation diagnosis operation interval on a target path according to the navigation information and the preset fuel evaporation diagnosis duration; after receiving the fuel evaporation diagnosis request, when the vacuum degree accumulation is needed, sending a fuel evaporation diagnosis vacuum degree accumulation instruction to an engine management system, and when the vehicle reaches the starting position of the fuel evaporation diagnosis operation interval, if the vehicle speed is smaller than a preset fuel evaporation diagnosis vehicle speed threshold value, sending a fuel evaporation diagnosis starting instruction to the engine management system. The invention can improve the diagnosis efficiency and the diagnosis completion rate of the fuel evaporation diagnosis system and reduce the ineffective triggering frequency of the fuel evaporation diagnosis.
Description
Technical Field
The invention belongs to the field of engine control, and particularly relates to a target path-based fuel evaporation diagnosis control method, a target path-based fuel evaporation diagnosis control system and a vehicle.
Background
In gasoline vehicles, it is desirable to monitor the integrity of the vehicle fuel vapor diagnostic system to prevent fuel vapors in the vehicle from leaking into the atmosphere and contaminating the atmosphere. Typically, a fuel vapor leakage diagnostic system is comprised of an engine, an engine management system, and fuel vapor related components. The fuel evaporation diagnosis control method comprises the following steps: and after the engine management system judges that the current engine operation condition and the vehicle running state meet the triggering conditions of fuel evaporation diagnosis according to the set established program, the engine management system can enter the fuel evaporation diagnosis process by adjusting the actions of related components of fuel evaporation and controlling the engine operation condition.
The fuel evaporation diagnosis principle is divided into a positive pressure type and a negative pressure type. The negative pressure type system is required to diagnose by means of a vacuum source formed by the operation of the engine; positive pressure systems typically require the configuration of specific positive pressure components. Meanwhile, in order to improve the reliability of fuel evaporation diagnosis, the fuel evaporation is prevented from being aggravated by fluctuation of the fuel level, the whole vehicle is required to be in a low-speed running or stopping working condition in the diagnosis process, and certain requirements are met on the diagnosis duration (namely, the duration of the vehicle maintains the low-speed or stopping working condition). Therefore, the current fuel evaporation diagnosis needs to enter the fuel evaporation diagnosis process after the engine operation condition and the vehicle running state meet the triggering condition of the fuel evaporation diagnosis, and once the operation condition of the engine or the vehicle running state changes to cause the diagnosis condition not to be met, the diagnosis is stopped, and in one driving cycle, the incomplete diagnosis is triggered again when the next condition is met, or the diagnosis is stopped after a certain number of attempts.
CN109281759a discloses a system and a method for diagnosing oil tank leakage by adopting a pressure sensor, which improves the diagnosis speed after diagnosis triggering and improves the applicability to idle start-stop vehicles by arranging a vacuum degree maintaining module and a waiting module. It still needs to wait for the vehicle speed to be below a threshold or for the engine to enter a start-stop state; meanwhile, the running state of the vehicle in the duration of the diagnosis requirement after entering the fuel evaporation diagnosis process cannot be judged, the situation that a certain diagnosis is triggered for a plurality of times due to incomplete diagnosis can possibly occur in actual driving, the diagnosis efficiency is reduced, and the fuel consumption, the emission and the drivability are adversely affected due to special air inlet, fuel injection and ignition settings of an engine in the diagnosis process.
Disclosure of Invention
The invention aims to provide a fuel evaporation diagnosis control method, a system and a vehicle based on a target path, so as to improve fuel evaporation diagnosis efficiency and reduce ineffective triggering frequency of fuel evaporation diagnosis.
The invention relates to a target path-based fuel evaporation diagnosis control method, which comprises the following steps:
obtaining navigation information based on a target path between a starting point and a destination according to the current starting point position information and destination position information input by a user; the navigation information comprises traffic flow speed, driving direction information, congestion information, traffic light position information and traffic light waiting time information.
And determining a fuel evaporation diagnosis operation interval on a target path according to the navigation information and the preset fuel evaporation diagnosis duration.
After receiving a fuel evaporation diagnosis request sent by an engine management system, sending a fuel evaporation diagnosis vacuum degree accumulation instruction to the engine management system when the vacuum degree accumulation is required, so that the engine management system controls the fuel evaporation related components to carry out fuel evaporation diagnosis negative pressure vacuum degree accumulation, and sending a fuel evaporation diagnosis starting instruction to the engine management system when the vehicle reaches the starting position of the fuel evaporation diagnosis operation interval, if the vehicle speed is smaller than a preset fuel evaporation diagnosis vehicle speed threshold value, so that the engine management system controls the fuel evaporation related components to start fuel evaporation diagnosis.
Preferably, the step of determining the fuel evaporation diagnosis operation interval on the target path according to the navigation information and the preset fuel evaporation diagnosis duration comprises the following steps:
And according to the traffic light position information, the traffic light waiting time information and the congestion information, stopping the vehicle on the target path due to waiting for the traffic light or stopping the vehicle due to congestion, wherein the stopping time is longer than a position interval of a preset fuel evaporation diagnosis duration, and n position intervals and n corresponding stopping time Tc 1、Tc2、…、Tcn are obtained.
And (3) combining the n parking time periods Tc 1、Tc2、…、Tcn with the parking reasons, and carrying out weighted calculation to obtain the available diagnosis reference time of the n position interval sections.
And sequencing the n position interval sections from long to short according to the available diagnosis reference time to form a fuel evaporation diagnosis operable interval sequence.
If the highest triggering frequency of the fuel evaporation diagnosis is m and m is less than n, selecting the first m position interval sections (namely, m position interval sections with longer available diagnosis reference time) in the fuel evaporation diagnosis operable interval sequence as the fuel evaporation diagnosis operation interval on the target path.
And if the set highest triggering frequency of the fuel evaporation diagnosis is m and m is more than or equal to n, taking n position interval sections in the fuel evaporation diagnosis operable interval sequence as the fuel evaporation diagnosis operation interval on the target path.
Preferably, the method for obtaining the available diagnosis reference time of the n position interval sections by combining the n parking time periods Tc 1、Tc2、…、Tcn with the parking reasons and performing weighted calculation is as follows:
If the parking source corresponding to a certain parking duration Tc i is waiting for a traffic light, the weighting coefficient is 1, and the available diagnosis reference time of the position interval corresponding to the parking duration Tc i is equal to Tc i ×1. If the parking source corresponding to a certain parking duration Tc i is congestion, the weighting coefficient is k, and the available diagnosis reference time of the position interval corresponding to the parking duration Tc i is equal to Tc i x k. Wherein i sequentially takes all integers from 1 to n, the weighting coefficient k is related to the congestion condition, and the more serious the congestion condition is, the larger the weighting coefficient k is.
Preferably, the congestion condition is judged according to the navigation information, and the congestion condition is divided into general congestion and serious congestion. If the congestion situation is general congestion, the weighting coefficient k=1.1; if the congestion situation is severe congestion, the weighting coefficient k=1.3.
Preferably, the time Td for the current vehicle to reach the start position of the nearest fuel evaporation diagnosis operation section on the target path is determined in real time according to the vehicle flow speed, the driving direction information and the traffic light position information. When Td is less than or equal to T1, judging that vacuum degree accumulation is needed; wherein T1 represents a preset negative pressure vacuum degree accumulated maximum time.
Preferably, the specific way of obtaining navigation information based on the target path between the starting point and the destination according to the current starting point position information and the destination position information input by the user is as follows:
The method comprises the steps that current starting point position information and destination position information input by a user are sent to a cloud server through a network, and the cloud server generates navigation information based on a target path between a starting point and a destination according to the received current starting point position information and the received destination position information and feeds the navigation information back through the network.
The target path-based fuel evaporation diagnostic control system of the present invention includes a power domain controller programmed to execute the target path-based fuel evaporation diagnostic control method described above.
The vehicle comprises the fuel evaporation diagnosis control system based on the target path.
According to the navigation information and the preset fuel evaporation diagnosis duration, the fuel evaporation diagnosis operation interval on the target path is determined, and the fuel evaporation diagnosis is carried out in the fuel evaporation diagnosis operation interval on the target path, so that the diagnosis efficiency and the diagnosis completion rate of the fuel evaporation diagnosis system are greatly improved, the ineffective triggering frequency of the fuel evaporation diagnosis is reduced, the fuel consumption and the emission of a vehicle are further reduced, and the driving performance and the comfort of the vehicle are improved.
Drawings
Fig. 1 is a diagram showing a configuration of a fuel evaporation diagnosis system based on a target path in the present embodiment.
Fig. 2 is a flowchart of a fuel evaporation diagnosis control method based on a target path in the present embodiment.
Detailed Description
As shown in fig. 1, the fuel evaporation diagnosis system based on the target path comprises a power domain controller 1, an engine management system 2, a cloud server 3 and an engine 4, wherein the power domain controller 1 and the cloud server 3 are in wireless communication through a network, the power domain controller 1 is connected with the engine management system 2 through a CAN bus, the engine management system 2 is connected with the engine 4, and the engine management system 2 controls the engine 4 to run.
The power domain controller 1 sends the current starting point position information and destination position information input by a user to the cloud server 3 through a network, and the cloud server 3 generates navigation information based on a target path between a starting point and a destination according to the received current starting point position information and destination position information and feeds the navigation information back to the power domain controller 1 through the network. Accordingly, the power domain controller 1 can obtain navigation information based on the target path between the start point and the destination based on the current start point position information and the destination position information input by the user. Meanwhile, in the running process of the vehicle, the cloud server 3 and the power domain controller 1 keep network communication, and the cloud server 3 updates navigation information in real time.
The engine management system 2 judges whether the engine needs to perform fuel evaporation diagnosis in the current driving cycle according to the regulation rule and the engine running state, and if so, sends a fuel evaporation diagnosis request to the power domain controller.
As shown in fig. 2, the fuel evaporation diagnosis control method based on the target path in the present embodiment is executed by the power domain controller 1, and specifically includes the steps of:
S1, obtaining navigation information based on a target path between a starting point and a destination according to the current starting point position information and destination position information input by a user, and then executing S2. The navigation information comprises traffic flow speed, driving direction information, congestion information, traffic light position information and traffic light waiting time information.
S2, determining a fuel evaporation diagnosis operation interval on a target path according to the navigation information and the preset fuel evaporation diagnosis duration, and then executing S3. The method comprises the following steps:
Firstly, according to traffic light position information, traffic light waiting time information and congestion information, parking due to waiting of a traffic light or parking due to congestion on a target path is estimated, and n position interval sections and corresponding n parking time Tc 1、Tc2、…、Tcn are obtained in a position interval section with parking time longer than a preset fuel evaporation diagnosis duration.
And secondly, carrying out weighted calculation on n parking time periods Tc 1、Tc2、…、Tcn combined with the parking reasons to obtain available diagnosis reference time of n position interval sections. If the parking source corresponding to a certain parking duration Tc i is waiting for a traffic light, the weighting coefficient is 1, and the available diagnosis reference time of the position interval corresponding to the parking duration Tc i is equal to Tc i ×1. If the parking source corresponding to a certain parking duration Tc i is congestion, the weighting coefficient is k, and the available diagnosis reference time of the position interval corresponding to the parking duration Tc i is equal to Tc i x k. Wherein i sequentially takes all integers from 1 to n, the weighting coefficient k is related to the congestion condition, and the more serious the congestion condition is, the larger the weighting coefficient k is. The congestion situation is judged according to the navigation information, and the congestion situation is divided into general congestion and serious congestion. If the congestion situation is general congestion, the weighting coefficient k=1.1; if the congestion situation is severe congestion, the weighting coefficient k=1.3.
Then, the n position interval sections are ordered from long to short according to the available diagnosis reference time, and a fuel evaporation diagnosis operable interval sequence is formed.
Finally, judging the magnitude relation between the highest triggering times m and n of the fuel evaporation diagnosis set by a user: if m is less than n, selecting the first m position interval sections in the fuel evaporation diagnosis operable interval sequence as fuel evaporation diagnosis operation intervals on the target path; and if m is more than or equal to n, taking n position interval sections in the fuel evaporation diagnosis operable interval sequence as fuel evaporation diagnosis operating intervals on the target path.
S3, judging whether a fuel evaporation diagnosis request sent by an engine management system is received, if so, executing S4, otherwise, ending.
S4, judging whether Td is less than or equal to T1, if so (namely, indicating that vacuum degree accumulation is needed), executing S5, otherwise, returning to executing S3. The Td represents the time for the current vehicle to reach the starting position of the nearest fuel evaporation diagnosis operation interval on the target path according to the vehicle flow speed, the driving direction information and the traffic light position information, and T1 represents the maximum accumulated time of the preset negative pressure vacuum degree.
S5, sending a fuel evaporation diagnosis vacuum degree accumulation instruction to the engine management system so that the engine management system controls the fuel evaporation related components to carry out fuel evaporation diagnosis negative pressure vacuum degree accumulation, and then executing S6. The method comprises the following steps: the engine management system controls the engine to enter an operating state, starts a fuel evaporation diagnosis negative pressure vacuum degree accumulation link, and maintains the idling of the engine after the required vacuum degree is reached.
S6, judging whether the vehicle reaches the initial position of the nearest fuel evaporation diagnosis operation interval on the target path, if so, executing S7, otherwise, continuing executing S6.
And S7, judging whether the vehicle speed is smaller than a preset fuel evaporation diagnosis vehicle speed threshold value, if so, executing S8, otherwise, returning to executing S3.
And S8, sending a fuel evaporation diagnosis starting instruction to the engine management system so that the engine management system controls the fuel evaporation related components to start fuel evaporation diagnosis, and ending.
The engine management system 2 performs fuel evaporation diagnosis execution and feedback according to the following strategy:
If the diagnostic process does not complete, exiting the diagnostic process, the engine management system 2 remains sending a fuel evaporation diagnostic request; if the diagnosis is completed and a fault is diagnosed, the engine management system 2 stops sending the fuel evaporation diagnosis request; if the diagnosis is completed and no fault is diagnosed, the engine management system 2 stops sending the fuel evaporation diagnosis request.
The present embodiment also provides a target path-based fuel evaporation diagnostic control system including the power domain controller 1, the power domain controller 1 being programmed to execute the target path-based fuel evaporation diagnostic control method described above.
The embodiment also provides a vehicle comprising the fuel evaporation diagnosis control system based on the target path.
Claims (7)
1. A target path-based fuel evaporation diagnostic control method, comprising:
Obtaining navigation information based on a target path between a starting point and a destination according to the current starting point position information and destination position information input by a user; the navigation information comprises traffic flow speed, driving direction information, congestion information, traffic light position information and traffic light waiting time information;
determining a fuel evaporation diagnosis operation interval on a target path according to the navigation information and a preset fuel evaporation diagnosis duration;
After receiving a fuel evaporation diagnosis request sent by an engine management system, sending a fuel evaporation diagnosis vacuum degree accumulation instruction to the engine management system when vacuum degree accumulation is required, so that the engine management system controls a fuel evaporation related component to perform fuel evaporation diagnosis negative pressure vacuum degree accumulation, and sending a fuel evaporation diagnosis starting instruction to the engine management system when a vehicle reaches a starting position of a fuel evaporation diagnosis operation interval, if the vehicle speed is smaller than a preset fuel evaporation diagnosis vehicle speed threshold value, so that the engine management system controls the fuel evaporation related component to start performing fuel evaporation diagnosis;
Wherein, according to the navigation information and the preset fuel evaporation diagnosis duration, the step of determining the fuel evaporation diagnosis operation interval on the target path comprises the following steps:
According to the traffic light position information, the traffic light waiting time information and the congestion information, stopping the vehicle on a target path due to waiting for the traffic light or stopping the vehicle due to congestion, wherein the stopping time is longer than a position interval of a preset fuel evaporation diagnosis duration, and n position interval sections and n corresponding stopping time Tc 1、Tc2、…、Tcn are obtained;
weighting calculation is carried out on n parking time periods Tc 1、Tc2、…、Tcn combined with the parking reasons to obtain available diagnosis reference time of n position interval sections;
Sequencing n position interval sections from long to short according to the available diagnosis reference time to form a fuel evaporation diagnosis operable interval sequence;
If the highest triggering frequency of the fuel evaporation diagnosis is m and m is less than n, selecting the first m position interval sections in the sequence as the fuel evaporation diagnosis operation interval on the target path;
And if the set highest triggering frequency of the fuel evaporation diagnosis is m and m is more than or equal to n, taking all n position interval sections in the sequence as the fuel evaporation diagnosis operation interval on the target path.
2. The target path-based fuel evaporation diagnosis control method according to claim 1, characterized in that: the method for obtaining the available diagnosis reference time of the n position interval sections by combining the n parking time lengths Tc 1、Tc2、…、Tcn with the parking reasons and carrying out weighted calculation is as follows:
If the parking source corresponding to a certain parking duration Tc i is waiting for a traffic light, the weighting coefficient is 1, and the available diagnosis reference time of the position interval corresponding to the parking duration Tc i is equal to Tc i x 1;
if the parking source corresponding to a certain parking duration Tc i is congestion, the weighting coefficient is k, and the available diagnosis reference time of the position interval corresponding to the parking duration Tc i is equal to Tc i x k;
wherein i sequentially takes all integers from 1 to n, the weighting coefficient k is related to the congestion condition, and the more serious the congestion condition is, the larger the weighting coefficient k is.
3. The target path-based fuel evaporation diagnosis control method according to claim 2, characterized in that:
Judging congestion conditions according to navigation information, wherein the congestion conditions are divided into general congestion and serious congestion;
if the congestion situation is general congestion, the weighting coefficient k=1.1;
If the congestion situation is severe congestion, the weighting coefficient k=1.3.
4. A target path-based fuel evaporation diagnosis control method according to any one of claims 1 to 3, characterized in that:
determining the time Td for the current vehicle to reach the starting position of the nearest fuel evaporation diagnosis operation interval on the target path in real time according to the vehicle flow speed, the driving direction information and the traffic light position information;
when Td is less than or equal to T1, judging that vacuum degree accumulation is needed; wherein T1 represents a preset negative pressure vacuum degree accumulated maximum time.
5. The target path-based fuel evaporation diagnosis control method according to claim 4, characterized in that: the specific way of obtaining navigation information based on the target path between the starting point and the destination is as follows according to the current starting point position information and the destination position information input by the user:
the method comprises the steps that current starting point position information and destination position information input by a user are sent to a cloud server (3) through a network, and the cloud server (3) generates navigation information based on a target path between a starting point and a destination according to the received current starting point position information and the received destination position information and feeds the navigation information back through the network.
6. A target path-based fuel evaporation diagnostic control system comprising a power domain controller (1), characterized in that: the power domain controller (1) is programmed to perform the target path-based fuel evaporation diagnostic control method as defined in any one of claims 1 to 5.
7. A vehicle, characterized in that: comprising a target path based fuel evaporation diagnostic control system as defined in claim 6.
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| JP3931707B2 (en) * | 2002-03-20 | 2007-06-20 | トヨタ自動車株式会社 | Abnormality diagnosis device for evaporative fuel treatment system |
| US10982607B2 (en) * | 2017-12-18 | 2021-04-20 | Ford Global Technologies, Llc | Systems and methods for vehicle fuel system and evaporative emissions system diagnostics |
| US10907563B2 (en) * | 2018-06-28 | 2021-02-02 | Ford Global Technologies, Llc | Evaporative emissions diagnostic during extended idle state |
| US10940854B2 (en) * | 2018-11-29 | 2021-03-09 | Ford Global Technologies, Llc | Systems and methods for reducing vehicle evaporative emissions |
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