Heavy-duty commercial vehicle diesel engine type post-processing predictive regeneration control method and system

Abstract

According to the diesel engine type post-processing predictive regeneration control method and system for the heavy-duty commercial vehicle, through fusion of high-precision map data, engine load prediction and an intelligent decision-making mechanism, by means of the high-load exhaust temperature of an engine, driving regeneration is started in advance, the carbon load is reduced, and in the regeneration process, the carbon load is reduced; the in-cylinder braking function needs to be closed, a driver is reminded to keep the continuous driving state, it is avoided that regeneration quits due to parking or engine flameout, and the normal driving state is recovered after regeneration is completed. The invention aims to realize accurate prediction and efficient management of post-treatment regeneration, reduce regeneration times and fuel injection quantity so as to meet increasingly strict emission regulation requirements and economic market demands, and improve fuel economy and transportation efficiency of vehicles.

Description

Technical Field

[0001] The present invention provides a predictive regeneration control method and system for aftertreatment of a heavy-duty commercial vehicle diesel engine, and relates to the technical field of emission and economy control of heavy-duty commercial vehicles. Background Art

[0002] With the increasing global awareness of environmental protection and the promotion of the dual carbon goals of "carbon peak and carbon neutrality", heavy-duty commercial vehicles, as an important part of the transportation sector, are increasingly attracting attention for their emissions and economy. Heavy-duty commercial vehicles have complex operating conditions and heavy loads, and the pollutants they emit, such as nitrogen oxides (NOx) and particulate matter (PM), have a serious impact on the environment. As an important component of the National VI diesel engine after-processor, the particulate filter DPF plays a key role in intercepting and treating particulate matter such as carbon soot and ash in the exhaust gas, thereby reducing the PM content in the exhaust gas. Therefore, the regeneration control of the commercial vehicle after-treatment system is particularly important.

[0003] With the release of the China VI diesel standard for commercial vehicles, regeneration control of the engine aftertreatment system has become increasingly important, directly affecting the engine's emission quality. With the development of high-precision maps and predictive control technologies, their integration into engine regeneration control has made regeneration more intelligent and accurate. In existing technologies, a common method is to trigger after-treatment driving regeneration when the carbon load reaches a certain value during vehicle driving. Under the complex and changing driving conditions of commercial vehicles, traditional regeneration strategies rely on DPF clogging monitoring, and the regeneration process is not initiated until the carbon load reaches a set threshold.

[0004] The existing commercial vehicle engine aftertreatment regeneration control method has problems such as delayed response and low regeneration efficiency, which are specifically manifested as follows:

[0005] 1. The carbon load is the sole choice of after-treatment regeneration condition, without considering the vehicle's future driving conditions to select the appropriate regeneration timing. This results in a delayed regeneration process and requires additional fuel injection to increase and maintain the after-treatment temperature, which is detrimental to vehicle economy.

[0006] 2. When triggering engine after-treatment regeneration in congested national highways or complex mountainous road conditions, multiple braking calls are required, especially when calling the engine cylinder brake, which causes the regeneration process to be interrupted. At this time, the carbon load is still at a high level, which makes it easy to trigger regeneration frequently and the regeneration efficiency is low. Summary of the Invention

[0007] To address the shortcomings of the existing technology, the present invention aims to provide a predictive regeneration control method and system for aftertreatment of heavy-duty commercial vehicle diesel engines. By integrating high-precision map data, engine load prediction, and intelligent decision-making mechanisms, it aims to achieve accurate prediction and efficient management of aftertreatment regeneration, reduce the number of regenerations and fuel injection volume, meet increasingly stringent emission regulations and economic market demands, and improve vehicle fuel economy and transportation efficiency. The specific technical solution is as follows:

[0008] A predictive regeneration control method for aftertreatment of a heavy-duty commercial vehicle diesel engine, comprising:

[0009] Forecast of the working condition ahead: If the average slope of the L kilometers ahead is ≥ the set threshold P1 and the maximum slope is ≥ the set threshold P2, the operating condition ahead is output as a mountainous condition; otherwise, it is output as a plain or hilly condition.

[0010] Engine load prediction: Calculates the average engine torque requirement. When the average engine torque requirement is greater than or equal to the set threshold N1, the engine load prediction is output as high load operation; otherwise, it is output as medium load operation or low load operation.

[0011] Predictive regeneration demand judgment: If the forward operating condition is predicted to be mountainous and the engine load is predicted to be high, and the set threshold T0 ≤ current carbon load < set threshold T1 is met, the vehicle enters driving regeneration mode, disables the in-cylinder braking function, and prompts the driver to maintain continuous driving;

[0012] Predictive regeneration strategy execution: Determine the completion status of driving regeneration. When regeneration is complete, restore the in-cylinder braking function and resume normal driving.

[0013] Normal regeneration strategy execution: When the set threshold T1 ≤ current carbon load < set threshold T2, the vehicle enters driving regeneration mode. When the current carbon load ≥ set threshold T2, the post-treatment DPF is severely clogged, prompting the driver to choose an appropriate time for parking regeneration, and then returns to normal driving state after completion.

[0014] Preferably, the average slope is identified by obtaining high-precision map information of the road ahead through the Internet of Vehicles data platform and the vehicle's current GPS positioning.

[0015] Preferably, the average required torque of the engine is calculated based on the average slope of the next L kilometers, the total weight of the vehicle and cargo, and the vehicle's rolling resistance, slope resistance, and wind resistance.

[0016] Furthermore, the calculation of the average required engine torque is based on the current average speed of the vehicle.

[0017] Preferably, the driver maintains a continuous driving state and is prompted through the instrument panel, and the prompt time is 3 seconds.

[0018] Preferably, the exit condition of the predictive regeneration strategy is: when the driving regeneration switch is turned off, the vehicle is parked, the engine is turned off, or a safety mechanism fails, the regeneration is interrupted, the regeneration mode is exited, the in-cylinder braking function is restored, and normal driving is resumed.

[0019] A predictive regeneration control system for aftertreatment of a heavy-duty commercial vehicle diesel engine comprises:

[0020] The forward operating condition prediction module is used to determine that when the average slope of the road ahead L kilometers is ≥ the set threshold P1 and the maximum slope is ≥ the set threshold P2, the forward operating condition is output as a mountainous condition; otherwise, the forward operating condition is output as a plain or hilly condition;

[0021] Engine load prediction, used to calculate the average engine torque requirement. When the average engine torque requirement is greater than or equal to the set threshold N1, the engine load prediction is output as high load operation; otherwise, the output is medium load operation or low load operation.

[0022] The predictive regeneration demand judgment module is used to determine if the current operating condition is predicted to be mountainous and the engine load is predicted to be high, and if the set threshold value T0 ≤ current carbon load < set threshold value T1 is met, the vehicle enters driving regeneration mode, disables the in-cylinder braking function, and prompts the driver to maintain continuous driving status;

[0023] The predictive regeneration strategy execution module is used to determine the completion status of driving regeneration. When regeneration is completed, the in-cylinder braking function is restored and normal driving is resumed.

[0024] The normal regeneration strategy execution module is used to determine when the set threshold value T1 ≤ current carbon load < set threshold value T2, the vehicle enters the driving regeneration mode; when the current carbon load ≥ set threshold value T2, the post-processing DPF is seriously clogged, prompting the driver to choose an appropriate time for parking regeneration, and return to normal driving state after completion.

[0025] The beneficial effects of the present invention compared to the prior art are:

[0026] 1) The present invention can combine the vehicle's front operating conditions to enter the post-processing regeneration phase in advance. By taking advantage of the engine's high-load operating conditions, the post-processing temperature is increased, and the additional fuel injection volume required to maintain the regeneration temperature is reduced. This avoids the reduction in engine power and increased fuel consumption caused by post-processing DPF clogging, thereby improving emission quality.

[0027] 2) The present invention can select the appropriate time to start the regeneration process and shut down the in-cylinder braking function at the right time, thereby improving the primary regeneration success rate, extending the service life of the post-processing DPF, reducing the replacement frequency, and lowering the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a flowchart of a method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1:

[0031] like Figure 1 As shown in the figure, ① is the forward working condition prediction, ② is the engine load prediction, ③ is the predictive regeneration demand judgment, ④ is the predictive regeneration strategy execution and exit, and ⑤ is the normal regeneration strategy execution.

[0032] This invention aims to establish a predictive regeneration control method for aftertreatment in heavy-duty commercial vehicle diesel engines. This method determines the optimal timing for aftertreatment regeneration based on the vehicle's forward operating conditions, engine load prediction, and current carbon load. This method achieves efficient control of aftertreatment regeneration, reduces excess fuel injection volume, and contributes to improved vehicle fuel economy, regeneration efficiency, and emission quality. The specific process is as follows:

[0033] Prediction of the road ahead: The system uses the IoV data platform and the vehicle's current GPS location to obtain high-precision map information of the road ahead. If the average slope over the L kilometers ahead is ≥ the set threshold P1 and the maximum slope is ≥ the set threshold P2, the system outputs the road ahead as a mountainous condition. Otherwise, the system outputs the road ahead as a plain or hilly condition.

[0034] Engine load prediction: Assume that the driver maintains the vehicle's current average speed for the next L kilometers. Based on the average slope of the next L kilometers, the total weight of the vehicle and cargo, and other information, the average required engine torque is calculated according to the vehicle's rolling resistance, slope resistance, and wind resistance. When the average required engine torque ≥ the set threshold N1, the output engine load prediction is high load operation; otherwise, the output is medium load operation or low load operation. The specific calculation method is as follows:

[0035] Assuming that the vehicle maintains its current constant speed and ignores acceleration resistance, the average required torque is calculated according to the theoretical formula of the automobile. The calculation formula is:

[0036]

[0037] Where, T tq The engine requires torque;

[0038] i gis the transmission ratio;

[0039] i0 is the rear axle speed ratio;

[0040] η T is the mechanical efficiency of the transmission system;

[0041] r is the tire rolling radius;

[0042] G is the total weight of the vehicle and cargo, G = mg;

[0043] f is the tire rolling resistance coefficient;

[0044] Gf expresses rolling resistance;

[0045] i is the average slope ahead L kilometers;

[0046] Gi expresses the slope resistance;

[0047] C D is the air resistance coefficient;

[0048] A is the frontal area of the vehicle;

[0049] u a Current vehicle speed;

[0050] Express wind resistance.

[0051] Predictive regeneration demand judgment: If the current operating conditions are predicted to be mountainous conditions and the engine load is predicted to be high, the predictive regeneration strategy is allowed to enter, that is, the enable is triggered. Combined with the current after-treatment carbon load status, when the set threshold T0 ≤ current carbon load < set threshold T1 is met, the vehicle is allowed to enter driving regeneration mode, and the in-cylinder braking function is simultaneously disabled and a prompt is issued for 3 seconds. The instrument prompts the driver to maintain continuous driving status for 3 seconds to ensure a successful regeneration.

[0052] Predictive regeneration strategy execution and exit: Determines the completion status of DPF regeneration after driving. When regeneration is complete, the in-cylinder braking function is restored and normal driving is resumed. If the driving regeneration switch is turned off, the vehicle is parked, the engine is turned off, or a safety mechanism fails, regeneration is interrupted, regeneration mode is exited, in-cylinder braking function is restored, and normal driving is resumed.

[0053] Normal regeneration strategy execution: When the set threshold T1 ≤ current carbon load < set threshold T2, the conventional regeneration requirements are met and the vehicle enters driving regeneration mode. When the current carbon load ≥ set threshold T2, the post-processing DPF is severely clogged, prompting the driver to choose an appropriate time for parking regeneration, and after completion, the vehicle returns to normal driving state. If neither condition is met, the current normal driving state is maintained.

[0054] Example 2:

[0055] A predictive regeneration control system for aftertreatment of a heavy-duty commercial vehicle diesel engine comprises:

[0056] The forward operating condition prediction module is used to determine that when the average slope of the road ahead L kilometers is ≥ the set threshold P1 and the maximum slope is ≥ the set threshold P2, the forward operating condition is output as a mountainous condition; otherwise, the forward operating condition is output as a plain or hilly condition;

[0057] Engine load prediction, used to calculate the average engine torque requirement. When the average engine torque requirement is greater than or equal to the set threshold N1, the engine load prediction is output as high load operation; otherwise, the output is medium load operation or low load operation.

[0058] The predictive regeneration demand judgment module is used to determine if the current operating condition is predicted to be mountainous and the engine load is predicted to be high, and if the set threshold value T0 ≤ current carbon load < set threshold value T1 is met, the vehicle enters driving regeneration mode, disables the in-cylinder braking function, and prompts the driver to maintain continuous driving status;

[0059] The predictive regeneration strategy execution module is used to determine the completion status of driving regeneration. When regeneration is completed, the in-cylinder braking function is restored and normal driving is resumed.

[0060] The normal regeneration strategy execution module is used to determine when the set threshold value T1 ≤ current carbon load < set threshold value T2, the vehicle enters the driving regeneration mode; when the current carbon load ≥ set threshold value T2, the post-processing DPF is seriously clogged, prompting the driver to choose an appropriate time for parking regeneration, and return to normal driving state after completion.

[0061] The present invention proposes a predictive regeneration control method and system for after-treatment of a heavy-duty commercial vehicle diesel engine. During normal driving of the vehicle, when it is identified that the operating condition ahead is a mountainous condition, the engine load is predicted to be high, and the carbon load is high at this time (not reaching the driving regeneration threshold), the exhaust temperature of the high-load engine is used to enter driving regeneration in advance to reduce the carbon load. During the regeneration process, the in-cylinder braking function needs to be turned off and the driver is reminded. At the same time, the driver is prompted to maintain a continuous driving state to avoid exiting the regeneration due to parking or engine stalling. After the regeneration is completed, the vehicle returns to a normal driving state. The invention has the advantages of improving the regeneration efficiency, vehicle economy, and emission quality of commercial vehicles, as well as reducing vehicle carbon emissions and DPF maintenance costs. It can achieve accurate prediction and efficient management of after-treatment regeneration, reduce the number of regenerations and fuel injection volume, meet increasingly stringent emission regulations and economic market demands, and improve the fuel economy and transportation efficiency of vehicles.

[0062] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine, characterized in that: include: Forecast of the working condition ahead: If the average slope of the L kilometers ahead is ≥ the set threshold P1 and the maximum slope is ≥ the set threshold P2, the operating condition ahead is output as mountainous; otherwise, it is output as plain or hilly. Engine load prediction: Calculates the average engine torque requirement. When the average engine torque requirement is greater than or equal to the set threshold N1, the engine load prediction is output as high load operation; otherwise, it is output as medium load operation or low load operation. Predictive regeneration demand judgment: If the forward operating condition is predicted to be mountainous and the engine load is predicted to be high, and the set threshold T0 ≤ current carbon load < set threshold T1 is met, the vehicle enters driving regeneration mode, disables the in-cylinder braking function, and prompts the driver to maintain continuous driving; Predictive regeneration strategy execution: Determine the completion status of driving regeneration. When regeneration is complete, restore the in-cylinder braking function and resume normal driving. Normal regeneration strategy execution: When the set threshold T1 ≤ current carbon load < set threshold T2, the vehicle enters driving regeneration mode. When the current carbon load ≥ set threshold T2, the post-treatment DPF is severely clogged, prompting the driver to choose an appropriate time for parking regeneration, and then returns to normal driving state after completion.

2. A method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine according to claim 1, characterized in that: The average slope is identified by obtaining high-precision map information of the road ahead through the Internet of Vehicles data platform and the vehicle's current GPS positioning.

3. The method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine according to claim 1, characterized in that: The average required engine torque is calculated based on the average slope of the preceding L kilometers, the gross vehicle and cargo weight information, and the vehicle's rolling resistance, slope resistance, and wind resistance.

4. A method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine according to claim 3, characterized in that: The calculation of the average required engine torque is based on the current average vehicle speed.

5. The method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine according to claim 1, characterized in that: The driver maintains a continuous driving state and is prompted through the instrument panel, and the prompt time is 3 seconds.

6. The method for predictive regeneration control of aftertreatment of a heavy-duty commercial vehicle diesel engine according to claim 1, characterized in that: The exit conditions of the predictive regeneration strategy are: when the driving regeneration switch is turned off, the vehicle is parked, the engine is turned off, or a safety mechanism fails, regeneration is interrupted, the regeneration mode is exited, the in-cylinder braking function is restored, and normal driving is resumed.

7. A heavy-duty commercial vehicle diesel engine aftertreatment predictive regeneration control system, used to execute the heavy-duty commercial vehicle diesel engine aftertreatment predictive regeneration control method according to any one of claims 1 to 6, characterized in that: include: The forward operating condition prediction module is used to determine that when the average slope of the road ahead L kilometers is ≥ the set threshold P1 and the maximum slope is ≥ the set threshold P2, the forward operating condition is output as a mountainous condition; otherwise, the forward operating condition is output as a plain or hilly condition; Engine load prediction, used to calculate the average engine torque requirement. When the average engine torque requirement is greater than or equal to the set threshold N1, the engine load prediction is output as high load operation; otherwise, the output is medium load operation or low load operation. The predictive regeneration demand judgment module is used to determine if the current operating condition is predicted to be mountainous and the engine load is predicted to be high, and if the set threshold value T0 ≤ current carbon load < set threshold value T1 is met, the vehicle enters driving regeneration mode, disables the in-cylinder braking function, and prompts the driver to maintain continuous driving status; The predictive regeneration strategy execution module is used to determine the completion status of driving regeneration. When regeneration is completed, the in-cylinder braking function is restored and normal driving is resumed. The normal regeneration strategy execution module is used to determine when the set threshold value T1 ≤ current carbon load < set threshold value T2, the vehicle enters the driving regeneration mode; when the current carbon load ≥ set threshold value T2, the post-processing DPF is seriously clogged, prompting the driver to choose an appropriate time for parking regeneration, and return to normal driving state after completion.

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