Predictive Regeneration Control Method and System for Aftertreatment of Diesel Engines in Heavy-Duty Commercial Vehicles

Abstract

This invention provides a predictive regeneration control method and system for aftertreatment systems in heavy-duty commercial vehicle diesel engines. By integrating high-precision map data, engine load prediction, and intelligent decision-making mechanisms, and leveraging the exhaust temperature under high engine load, the system initiates regeneration in advance while the vehicle is in motion, reducing carbon load. During regeneration, the in-cylinder braking function must be deactivated, and the driver must be alerted to maintain continuous driving to prevent regeneration from being interrupted due to stopping or engine shutdown. After regeneration is complete, normal driving resumes. This invention aims to achieve precise prediction and efficient management of aftertreatment regeneration, reducing the number of regeneration cycles and fuel injection volume to meet increasingly stringent emission regulations and economic market demands, thereby improving vehicle fuel economy and transportation efficiency.

Description

Technical Field

[0001] This invention proposes a predictive regenerative control method and system for aftertreatment of diesel engines in heavy-duty commercial vehicles, relating to the field of emission and economic control technology for heavy-duty commercial vehicles. Background Technology

[0002] With increasing global awareness of environmental protection and the promotion of the dual carbon goals of "carbon peaking and carbon neutrality," the emissions and economic efficiency of heavy-duty commercial vehicles, as a crucial component of the transportation sector, are receiving increasing attention. Heavy-duty commercial vehicles operate under complex conditions and carry heavy loads, resulting in emissions of pollutants such as nitrogen oxides (NOx) and particulate matter (PM) that severely impact the environment. The diesel particulate filter (DPF), as a vital component of the China VI diesel engine aftertreatment system, plays a crucial role in intercepting and treating particulate matter such as soot and ash in exhaust gases, thereby reducing PM content. Therefore, the regenerative control of commercial vehicle aftertreatment systems is particularly important.

[0003] Following the release of the China VI emission standard for commercial vehicle diesel engines, the regeneration control of the engine aftertreatment system has become increasingly important, directly impacting engine emissions quality. With the development of high-precision mapping and predictive control technologies, their integration into engine regeneration control makes regeneration more intelligent and accurate. In existing technologies, a common method is to trigger aftertreatment regeneration during vehicle operation when the carbon load reaches a certain value. However, under the complex and variable operating conditions of commercial vehicles, traditional regeneration strategies rely on DPF (Dielectric Power Filter) clogging monitoring, initiating the regeneration process only when the carbon load reaches a set threshold.

[0004] Existing aftertreatment regeneration control methods for commercial vehicle engines suffer from problems such as slow response and low regeneration efficiency, specifically manifested as follows:

[0005] 1. Simply selecting carbon load as the post-treatment regeneration condition without considering the vehicle's future driving conditions to select an appropriate regeneration time results in a delayed regeneration process, and requires additional fuel injection to increase and maintain the post-treatment temperature, which is detrimental to the overall vehicle economy.

[0006] 2. When the engine aftertreatment regeneration is triggered in congested national highways or complex mountain road conditions, multiple braking calls are required, especially when the engine cylinder braking is called, which causes the regeneration process to be interrupted. At this time, the carbon load is still high, which easily leads to frequent regeneration triggers and low regeneration efficiency. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention aims to provide a predictive regeneration control method and system for aftertreatment systems in 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, reducing the number of regeneration cycles and fuel injection quantities to meet increasingly stringent emission regulations and economic market demands, thereby improving vehicle fuel economy and transportation efficiency. The specific technical solution is as follows:

[0008] A predictive regeneration control method for aftertreatment of diesel engines in heavy-duty commercial vehicles includes:

[0009] Forward operating condition prediction: If the average gradient of the road ahead (L kilometers) is greater than or equal to the set threshold P1 and the maximum gradient is greater than or equal to the set threshold P2, output that the operating condition ahead is mountainous; otherwise, output that it is plain or hilly.

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

[0011] Predictive regeneration demand judgment: When the current working 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, the in-cylinder braking function is turned off and the driver is prompted to maintain continuous driving.

[0012] Predictive regeneration strategy execution: Determine the completion status of vehicle regeneration. Once regeneration is complete, restore 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 aftertreatment DPF is severely clogged, prompting the driver to choose an appropriate time to perform parking regeneration. After completion, the vehicle returns to normal driving state.

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

[0015] Preferably, the average torque required by the engine is calculated based on the average gradient of the road ahead (L km) and the total weight of the vehicle and cargo, taking into account vehicle rolling resistance, slope resistance, and wind resistance.

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

[0017] Preferably, the driver maintains a continuous driving state by providing a prompt via the instrument panel for 3 seconds.

[0018] Preferably, the exit condition of the predictive regeneration strategy is as follows: when the vehicle regeneration switch is turned off, the vehicle is stopped, the engine is turned off, or a fail-safe mechanism is activated, 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 diesel engines in heavy-duty commercial vehicles includes:

[0020] The forward operating condition prediction module is used to determine whether the average slope of the road ahead (L kilometers) is greater than or equal to the set threshold P1 and the maximum slope is greater than or equal to the set threshold P2. If so, the forward operating condition is mountainous; otherwise, the output is plain or hilly.

[0021] Engine load prediction is used to calculate the average engine torque demand. When the average engine torque demand 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 that the current working condition is predicted to be mountainous and the engine load is predicted to be high. When the set threshold T0 ≤ current carbon load < set threshold T1, the vehicle enters the driving regeneration mode, turns off the in-cylinder braking function and prompts the driver to maintain continuous driving.

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

[0024] The normal regeneration strategy execution module determines when the vehicle enters the driving regeneration mode if the set threshold T1 ≤ current carbon load < set threshold T2. If the current carbon load ≥ set threshold T2, the after-treatment DPF is severely clogged, prompting the driver to choose an appropriate time to perform parking regeneration. After completion, the vehicle returns to normal driving status.

[0025] The advantages of this invention over the prior art are as follows:

[0026] 1) This invention can combine the operating conditions of the vehicle's front end to enter the after-treatment regeneration stage in advance. By taking advantage of the high-load operating conditions of the engine, the after-treatment temperature is increased, the amount of extra fuel injection required to maintain the regeneration temperature is reduced, and the engine power reduction and fuel consumption increase caused by the clogging of the after-treatment DPF are avoided, thereby improving the emission quality.

[0027] 2) This invention can select the appropriate time to start the regeneration process and shut down functions such as in-cylinder braking in a timely manner, thereby increasing the regeneration power, extending the service life of the post-treatment DPF, reducing the replacement frequency, and lowering maintenance costs. Attached Figure Description

[0028] Figure 1 This is a flowchart of a predictive regeneration control method for aftertreatment of diesel engines in heavy-duty commercial vehicles according to the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1:

[0031] like Figure 1 As shown, ① represents the forecast of the preceding operating conditions, ② represents the forecast of the engine load, ③ represents the judgment of the anticipatory regeneration demand, ④ represents the execution and exit of the anticipatory regeneration strategy, and ⑤ represents the execution of the normal regeneration strategy.

[0032] This invention aims to establish a predictive regeneration control method for aftertreatment systems in heavy-duty commercial vehicle diesel engines. By predicting the vehicle's operating conditions, engine load, and current carbon load, the optimal timing for aftertreatment regeneration is determined, achieving efficient control of aftertreatment regeneration, reducing additional fuel injection, and contributing to improved vehicle fuel economy, regeneration efficiency, and emission quality. The specific process is as follows:

[0033] Forward driving condition prediction: By using the vehicle network data platform and the vehicle's current GPS positioning, high-precision map information of the road ahead is obtained. When the average slope of the road ahead (L kilometers) is greater than or equal to the set threshold P1 and the maximum slope is greater than or equal to the set threshold P2, the forward driving condition is output as a mountainous condition. Otherwise, the output is a plain or hilly condition.

[0034] Engine load prediction: The driver is set to maintain the vehicle's current average speed for the next L kilometers. Based on information such as the average gradient of the next L kilometers and the total weight of the vehicle and cargo, the average engine torque demand is calculated according to vehicle rolling resistance, slope resistance, and wind resistance. When the average engine torque demand is greater than or equal to a 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. The specific calculation method is as follows:

[0035] Assuming the vehicle maintains its current constant speed and neglects acceleration resistance, the average torque demand is calculated using theoretical automotive formulas. The formula is as follows:

[0036]

[0037] In the formula, T tq This is to meet the engine's torque requirements;

[0038] i gFor the gearbox speed ratio;

[0039] i0 is the rear axle speed ratio;

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

[0041] r is the tire rolling radius;

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

[0043] f is the tire rolling resistance coefficient;

[0044] Gf represents rolling resistance;

[0045] i represents the average slope over the next L kilometers;

[0046] Gi represents ramp resistance;

[0047] C D This refers to the air drag coefficient;

[0048] A represents the frontal area of ​​the entire vehicle;

[0049] u a Current vehicle speed;

[0050] Expressing wind resistance.

[0051] Predictive regeneration demand judgment: If the current working condition is predicted to be mountainous and the engine load is predicted to be high, the predictive regeneration strategy is allowed to be entered, 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 the driving regeneration mode. At the same time, the in-cylinder braking function is turned off and a prompt is given for 3 seconds. The instrument prompts the driver to maintain continuous driving state for 3 seconds to ensure a successful regeneration.

[0052] Predictive regeneration strategy execution and exit: Determine the completion status of DPF regeneration after driving. When regeneration is completed, restore the in-cylinder braking function and resume normal driving. When there is a situation where the driving regeneration switch is turned off, the vehicle is stopped, the engine is turned off, or a fault safety mechanism is activated, regeneration is interrupted, the regeneration mode is exited, the in-cylinder braking function is restored, and the normal driving state is resumed.

[0053] Normal regeneration strategy execution: When the set threshold T1 ≤ current carbon load < set threshold T2, the normal regeneration requirements are met, and the vehicle enters driving regeneration mode. When the current carbon load ≥ set threshold T2, the aftertreatment DPF is severely clogged, prompting the driver to choose an appropriate time to perform parking regeneration. 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 diesel engines in heavy-duty commercial vehicles includes:

[0056] The forward operating condition prediction module is used to determine whether the average slope of the road ahead (L kilometers) is greater than or equal to the set threshold P1 and the maximum slope is greater than or equal to the set threshold P2. If so, the forward operating condition is mountainous; otherwise, the output is plain or hilly.

[0057] Engine load prediction is used to calculate the average engine torque demand. When the average engine torque demand 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 that the current working condition is predicted to be mountainous and the engine load is predicted to be high. When the set threshold T0 ≤ current carbon load < set threshold T1, the vehicle enters the driving regeneration mode, turns off the in-cylinder braking function and prompts the driver to maintain continuous driving.

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

[0060] The normal regeneration strategy execution module determines when the vehicle enters the driving regeneration mode if the set threshold T1 ≤ current carbon load < set threshold T2. If the current carbon load ≥ set threshold T2, the after-treatment DPF is severely clogged, prompting the driver to choose an appropriate time to perform parking regeneration. After completion, the vehicle returns to normal driving status.

[0061] This invention proposes a predictive regeneration control method and system for aftertreatment systems in heavy-duty commercial vehicle diesel engines. During normal driving, when the system identifies mountainous terrain ahead and predicts a high engine load with a relatively high carbon load (not yet reaching the driving regeneration threshold), it initiates driving regeneration in advance, utilizing the exhaust temperature from the high engine load to reduce the carbon load. During regeneration, the in-cylinder braking function is deactivated, and the driver is alerted to maintain continuous driving to prevent regeneration from being interrupted due to stopping or engine shutdown. After regeneration is complete, normal driving resumes. This invention offers advantages such as improved regeneration efficiency, overall vehicle economy, and emission quality, as well as reduced overall vehicle carbon emissions and DPF maintenance costs. It enables precise prediction and efficient management of aftertreatment regeneration, reducing the number of regeneration cycles and fuel injection volume to meet increasingly stringent emission regulations and economic market demands, thereby improving vehicle fuel economy and transportation efficiency.

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

Claims

1. A predictive regeneration control method for aftertreatment of diesel engines in heavy-duty commercial vehicles, characterized in that, include: Forward operating condition prediction: If the average gradient of the road ahead (L kilometers) is greater than or equal to the set threshold P1 and the maximum gradient is greater than or equal to the set threshold P2, output that the operating condition ahead is mountainous; otherwise, output that it is plain or hilly. Engine load prediction: Calculate the average engine torque demand. When the average engine torque demand is greater than or equal to the set threshold N1, output the engine load prediction as high load operation; otherwise, output medium load operation or low load operation. Predictive regeneration demand judgment: When the current working 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, the in-cylinder braking function is turned off and the driver is prompted to maintain continuous driving. Predictive regeneration strategy execution: Determine the completion status of vehicle regeneration. Once regeneration is complete, restore 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 aftertreatment DPF is severely clogged, prompting the driver to choose an appropriate time to perform parking regeneration. After completion, the vehicle returns to normal driving state.

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

3. The predictive regenerative control method for aftertreatment of heavy-duty commercial vehicle diesel engines according to claim 1, characterized in that, The average torque required by the engine is calculated based on the average gradient of the road ahead (L kilometers) and the total weight of the vehicle and cargo, taking into account vehicle rolling resistance, slope resistance, and wind resistance.

4. The predictive regenerative control method for aftertreatment of heavy-duty commercial vehicle diesel engines according to claim 3, characterized in that, The calculation of the engine's average torque requirement is based on the vehicle's current average speed.

5. The predictive regenerative control method for aftertreatment of heavy-duty commercial vehicle diesel engines according to claim 1, characterized in that, The driver is prompted to maintain continuous driving status via the instrument panel for 3 seconds.

6. The predictive regenerative control method for aftertreatment of heavy-duty commercial vehicle diesel engines according to claim 1, characterized in that, The exit condition for the predictive regeneration strategy is as follows: when the vehicle regeneration switch is turned off, the vehicle is stopped, the engine is shut down, or a fail-safe mechanism is activated, regeneration is interrupted, the regeneration mode is exited, the in-cylinder braking function is restored, and normal driving is resumed.

7. A predictive regenerative control system for aftertreatment of heavy-duty commercial vehicle diesel engines, used to execute the predictive regenerative control method for aftertreatment of heavy-duty commercial vehicle diesel engines as described in any one of claims 1-6, characterized in that, include: The forward operating condition prediction module is used to determine whether the average slope of the road ahead (L kilometers) is greater than or equal to the set threshold P1 and the maximum slope is greater than or equal to the set threshold P2. If so, the forward operating condition is mountainous; otherwise, the output is plain or hilly. Engine load prediction is used to calculate the average engine torque demand. When the average engine torque demand 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 that the current working condition is predicted to be mountainous and the engine load is predicted to be high. When the set threshold T0 ≤ current carbon load < set threshold T1, the vehicle enters the driving regeneration mode, turns off the in-cylinder braking function and prompts the driver to maintain continuous driving. The predictive regeneration strategy execution module is used to determine the completion status of vehicle regeneration. Once regeneration is complete, the in-cylinder braking function is restored, and normal driving is resumed. The normal regeneration strategy execution module determines when the vehicle enters the driving regeneration mode if the set threshold T1 ≤ current carbon load < set threshold T2. If the current carbon load ≥ set threshold T2, the after-treatment DPF is severely clogged, prompting the driver to choose an appropriate time to perform parking regeneration. After completion, the vehicle returns to normal driving status.

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