Diesel extended range vehicle DPF regeneration protection control method and system

Abstract

The invention relates to a diesel extended range vehicle DPF regeneration protection control method and system, and relates to the technical field of automobile and engine post-processing, and the method comprises the following steps: detecting DPF carbon load; the RCU receives the regeneration request, calculates the time length required for charging according to the current battery SOC value and the maximum SOC value, and compares the time length with the time required for regeneration; the RCU sends a regeneration permission flag bit back to the ECU, and the ECU enters a DPF regeneration mode when a preset regeneration condition is met; the ECU adjusts a fuel injection strategy according to the pre-control temperature to increase the inlet temperature of the DPF, and the RCU increases the power generation power according to the SOC value of the battery to increase the load of the engine; the RCU triggers a delay shutdown strategy, outputs a rotating speed and torque control message to control an ECU to increase the idle speed of an engine, and controls a T15 power-off engine to stop after the time is met; and after regeneration is finished, the engine quits the regeneration mode. The DPF regeneration efficiency and the fuel oil utilization rate of the diesel extended-range vehicle can be improved, and the problems of DPF blockage, frequent regeneration and over-temperature burning of the DPF caused by high-temperature shutdown in the regeneration process are solved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile and engine aftertreatment, and in particular to a DPF regeneration protection control system and method for a diesel range-extended vehicle. Background Art

[0002] In the field of traditional diesel extended-range vehicles, the diesel particulate filter (DPF) is a key exhaust after-treatment component. The stability and integrity of its regeneration process are crucial to vehicle performance and environmental efficiency. However, existing technologies have significant defects. During regeneration, if the driver stops the vehicle, the engine will immediately shut down, causing the DPF regeneration to be interrupted and unable to be fully completed. This not only causes an abnormal increase in the frequency of DPF regeneration and clogging, but also because the DPF is in a high-temperature state during regeneration, a sudden shutdown can easily cause high-temperature burning. A series of chain reactions cause the vehicle's fuel consumption to rise and the DPF's service life to be significantly shortened, seriously restricting the vehicle's overall performance and environmental benefits. It is difficult to meet today's increasingly stringent environmental regulations and users' expectations and demands for vehicle reliability. Summary of the Invention

[0003] The purpose of the present invention is to provide a DPF regeneration protection control method and system for diesel range-extended vehicles, so as to improve the DPF regeneration efficiency and fuel utilization rate of diesel range-extended vehicles, reduce the problems of DPF blockage, frequent regeneration and DPF over-temperature burning caused by high-temperature shutdown during the regeneration process.

[0004] In order to achieve the above object, the technical solution of the present invention provides a DPF regeneration protection control method for a diesel extended range vehicle, comprising the following steps:

[0005] S01, detect the DPF carbon load, when it reaches the preset value, the ECU sends a regeneration request flag;

[0006] S02, the RCU receives a regeneration request, calculates the required charging time based on the current battery SOC value and the maximum SOC value, and compares it with the required regeneration time. If the required regeneration time condition is met, S03 is executed. Otherwise, the range extender is controlled to reduce the generated power and the process returns to S02;

[0007] S03, RCU sends back the regeneration permission flag to ECU, and ECU enters DPF regeneration mode when the preset regeneration conditions are met;

[0008] In step S04, the ECU adjusts the fuel injection strategy based on the pre-controlled temperature to increase the DPF inlet temperature. It also turns on the regeneration indicator light and issues a text prompt. The RCU increases power generation based on the battery SOC value to increase engine load and improve DPF regeneration efficiency.

[0009] If the DPF carbon content is lower than the preset value in step S05, step S06 is executed. Otherwise, if the driver turns off the vehicle, the RCU triggers the delayed shutdown strategy and outputs a speed and torque control message to the ECU to increase the engine idle speed, cancel the engine torque output, and control the engine to delay shutdown while issuing a prompt message. When the time is met, the engine is shut down at step T15.

[0010] S06, after regeneration is completed, the engine exits the regeneration mode and the regeneration indicator light goes out;

[0011] S07: When the vehicle is shut down, the RCU controls T15 to power off according to the normal shutdown strategy, and the engine is shut down normally.

[0012] The technical solution of the present invention also provides a DPF regeneration protection control system for a diesel range-extended vehicle, comprising:

[0013] The range extender control unit (RCU) is used to coordinate control with the engine control unit (ECU), receive the regeneration request flag sent by the ECU, calculate the charging time based on the current battery SOC value and the maximum SOC value, and compare it with the regeneration time required. If the regeneration time requirement is met, the regeneration permission flag is sent back to the ECU. Otherwise, the range extender is controlled to reduce the power generation to reduce the battery SOC value so that the charging time meets the DPF regeneration time requirement.

[0014] The engine control unit ECU is used to detect the DPF carbon load, send a regeneration request flag when it reaches the preset value, and enter the DPF regeneration mode when it receives the RCU regeneration permission flag and meets the preset regeneration conditions. It adjusts the fuel injection strategy according to the pre-controlled temperature to increase the DPF inlet temperature, and controls the regeneration indicator light to light up and issue a text prompt. During the regeneration process, the engine idle speed and torque output are adjusted according to the control of the RCU.

[0015] Preferably, the RCU is further configured to dynamically adjust the power generation according to the battery SOC value when controlling the range extender to reduce the power generation, so as to ensure the stability and economy of the vehicle power system while meeting the DPF regeneration time condition.

[0016] Preferably, after entering the DPF regeneration mode, the ECU is further configured to dynamically adjust the fuel injection strategy according to changes in the DPF carbon load, so as to maintain the DPF inlet temperature within a preset regeneration temperature range.

[0017] Preferably, it further comprises a regeneration indicator light and a text prompt device for prompting the driver, wherein the regeneration indicator light and the text prompt device are controlled to light up and issue a prompt message respectively when the ECU enters the DPF regeneration mode.

[0018] In summary, the present invention has the following beneficial technical effects:

[0019] Significantly improve the DPF regeneration efficiency of diesel extended-range vehicles, achieve precise control through optimized control strategies, ensure efficient DPF regeneration process, and reduce regeneration time; effectively improve fuel utilization, reasonably adjust the fuel injection strategy during the regeneration process, make the engine run at the best working condition, and reduce fuel consumption; significantly reduce the risk of DPF clogging, avoid the accumulation of particulate matter caused by incomplete regeneration, and maintain DPF patency; effectively reduce the frequent DPF regeneration problem, improve regeneration quality, and extend the regeneration cycle; avoid DPF over-temperature burning caused by high-temperature shutdown during the regeneration process, and ensure sufficient cooling of the DPF through a delayed shutdown strategy, extend its service life, ensure vehicle performance and environmental benefits, and meet regulations and user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a flow chart of a DPF regeneration protection control method for a diesel range-extended vehicle according to the present invention. DETAILED DESCRIPTION

[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1:

[0023] The embodiments of the present invention disclose a DPF regeneration protection control system and method for a diesel extended-range vehicle. By cleverly utilizing the decoupling feature of the extended-range vehicle's power system, the control system is intended to significantly improve the DPF regeneration efficiency, effectively reduce DPF blockage problems caused by interruptions in the DPF regeneration process, and avoid the risk of DPF high-temperature burning caused by engine shutdown during the regeneration process, thereby effectively enhancing the safety and reliability of the vehicle during the DPF regeneration stage.

[0024] The entire system encompasses the key control units of diesel range-extended vehicles, including the range extender control unit (RCU) and the engine control unit (ECU). These two core components enable efficient collaborative control, enabling information exchange and command transmission, thereby precisely regulating various operating parameters during DPF regeneration and ensuring a smooth regeneration process.

[0025] As shown in the figure, the entire technical solution process is divided into 7 steps.

[0026] In step S01, the DPF carbon load is detected to have reached a preset value, meeting the carbon load condition for triggering DPF regeneration. The ECU then signals a regeneration request flag and switches to step S02. This step aims to accurately detect the carbon load so that subsequent regeneration procedures can be initiated promptly.

[0027] In step S02, after receiving the regeneration request from the ECU, the RCU calculates the required charging time based on the current battery SOC value and the maximum SOC value. It then compares the required charging time with the required regeneration time. If the required regeneration time condition is met, the system switches to step S03. Otherwise, the RCU controls the range extender to reduce the power generation and lower the battery SOC value, so that the charging time meets the DPF regeneration time condition as soon as possible. This step creates favorable conditions for DPF regeneration by rationally regulating the power generation and battery SOC value, ensuring that there is sufficient time for the regeneration process.

[0028] In step S03, the RCU sends a regeneration-enabling flag back to the ECU. The ECU then enters DPF regeneration mode if the preset regeneration conditions are met and switches to step S04. This enables effective communication and coordination between the two control units, ensuring a scientific and orderly activation of the regeneration mode.

[0029] In S04, the ECU adjusts the fuel injection strategy based on the pre-controlled temperature, raising the DPF inlet temperature. The regeneration indicator lights up, and a text message prompts, "DPF regeneration in progress, do not turn off the engine," to remind the driver not to turn off the vehicle. During this process, the RCU increases power generation based on the battery SOC value, increasing engine load and improving DPF regeneration efficiency. The process then switches to S05. This step, by optimizing the injection strategy and properly adjusting power generation, not only ensures the required temperature environment for DPF regeneration, but also improves regeneration efficiency. It also promptly informs the driver of the current vehicle status, preventing human interference with the regeneration process.

[0030] If the DPF carbon content falls below the preset value in S05, regeneration is complete and the system switches to S06. If the driver ignores the regeneration prompt and directly turns off the vehicle before regeneration is complete, regeneration is terminated and the regeneration indicator light turns off. The RCU triggers the delayed shutdown strategy, outputting a speed and torque control message to the ECU to increase the engine idle speed, cancel engine torque output, and delay engine shutdown. Simultaneously, the instrument panel displays the message "DPF cooling, shutdown in * minutes." Once the time is met, the system powers down at T15 and shuts down the engine. This process fully accounts for potential human error in real-world driving scenarios, protecting the DPF from thermal shock damage caused by sudden shutdowns through delayed shutdown and corresponding prompts.

[0031] S06, regeneration ends, the engine exits the regeneration mode, and the regeneration indicator light goes out, which indicates that a complete regeneration cycle is basically completed and the vehicle returns to normal operation.

[0032] At S07, the driver shuts down the vehicle and the RCU controls T15 to power down according to the normal shutdown strategy, shutting down the engine normally. This control system and method, through the tight logical connections between each step and a rational control strategy, comprehensively ensures the regeneration effect and service life of the DPF, improving the reliability and safety of vehicle operation.

[0033] Example 2:

[0034] The following are implementation cases in different situations based on Example 1:

[0035] 1. A range-extended vehicle triggers a DPF regeneration requirement due to DPF carbon content. The RCU calculates that the battery charge reaches the maximum SOC in 35 minutes, meeting the 25-minute DPF regeneration condition. The engine enters regeneration mode and simultaneously increases the RCU power generation and engine load, causing the engine to operate in the optimal fuel consumption and temperature control zone. At this time, due to driving requirements, the vehicle is parked, the range extender is decoupled from the drive motor, and the engine maintains optimal fuel consumption and temperature control zone operation until DPF regeneration is completed and automatically exits regeneration mode, ensuring efficient fuel utilization and DPF regeneration efficiency during the DPF regeneration process.

[0036] 2. A range-extended vehicle triggers a DPF regeneration requirement due to DPF carbon content. The RCU calculates that the battery charge reaches the maximum SOC in 35 minutes, meeting the 25-minute DPF regeneration condition. The engine enters regeneration mode and simultaneously increases the power generation and engine load, allowing the engine to operate in the optimal fuel consumption and temperature control zone. At this time, the driver ignores the regeneration prompt and stops the vehicle, decoupling the range extender from the drive motor. The RCU controls the ECU to increase the engine idle speed, allowing the DPF temperature to drop to a safe temperature at the optimal rate before controlling the T15 power-off and engine shutdown. This avoids the problem of DPF overheating and burning caused by high-temperature shutdown during the regeneration process, effectively extending the DPF service life.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or 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 DPF regeneration protection control method for a diesel range-extended vehicle, characterized in that: The following steps are involved: S01, detect the DPF carbon load, when it reaches the preset value, the ECU sends a regeneration request flag; S02, the RCU receives a regeneration request, calculates the required charging time based on the current battery SOC value and the maximum SOC value, and compares it with the required regeneration time. If the required regeneration time condition is met, S03 is executed. Otherwise, the range extender is controlled to reduce the generated power and the process returns to S02; S03, RCU sends back the regeneration permission flag to ECU, and ECU enters DPF regeneration mode when the preset regeneration conditions are met; In step S04, the ECU adjusts the fuel injection strategy based on the pre-controlled temperature to increase the DPF inlet temperature. It also turns on the regeneration indicator light and issues a text prompt. The RCU increases power generation based on the battery SOC value to increase engine load and improve DPF regeneration efficiency. If the DPF carbon content is lower than the preset value in step S05, step S06 is executed. Otherwise, if the driver turns off the vehicle, the RCU triggers the delayed shutdown strategy and outputs a speed and torque control message to the ECU to increase the engine idle speed, cancel the engine torque output, and control the engine to delay shutdown while issuing a prompt message. When the time is met, the engine is shut down at step T15. S06, after regeneration is completed, the engine exits the regeneration mode and the regeneration indicator light goes out; S07: When the vehicle is shut down, the RCU controls T15 to power off according to the normal shutdown strategy, and the engine is shut down normally.

2. A system using the DPF regeneration protection control method for a diesel range-extended vehicle according to claim 1, characterized in that: include: The range extender control unit (RCU) is used to coordinate control with the engine control unit (ECU), receive the regeneration request flag sent by the ECU, calculate the charging time based on the current battery SOC value and the maximum SOC value, and compare it with the regeneration time required. If the regeneration time requirement is met, the regeneration permission flag is sent back to the ECU. Otherwise, the range extender is controlled to reduce the power generation to reduce the battery SOC value so that the charging time meets the DPF regeneration time requirement. The engine control unit ECU is used to detect the DPF carbon load, send a regeneration request flag when it reaches the preset value, and enter the DPF regeneration mode when it receives the RCU regeneration permission flag and meets the preset regeneration conditions. It adjusts the fuel injection strategy according to the pre-controlled temperature to increase the DPF inlet temperature, and controls the regeneration indicator light to light up and issue a text prompt. During the regeneration process, the engine idle speed and torque output are adjusted according to the control of the RCU.

3. A DPF regeneration protection control system for a diesel range-extended vehicle according to claim 2, characterized in that: When controlling the range extender to reduce the generated power, the RCU is also used to dynamically adjust the generated power according to the battery SOC value, so as to ensure the stability and economy of the vehicle power system while meeting the DPF regeneration time condition.

4. A DPF regeneration protection control system for a diesel range-extended vehicle according to claim 1, characterized in that: After entering the DPF regeneration mode, the ECU is further configured to dynamically adjust the fuel injection strategy according to changes in the DPF carbon load to maintain the DPF inlet temperature within a preset regeneration temperature range.

5. A DPF regeneration protection control system for a diesel range-extended vehicle according to claim 1, characterized in that: It also includes a regeneration indicator light and a text prompt device for prompting the driver. The regeneration indicator light and the text prompt device are controlled to light up and send prompt information respectively when the ECU enters the DPF regeneration mode.

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