Range-extended diesel engine regeneration and whole vehicle power cooperative control method and system

Abstract

The invention discloses a cooperative control method for regeneration of an extended-range diesel engine and power of a whole vehicle, and relates to the technical field of power control of extended-range vehicles. The technical problems that regeneration triggering of an existing extended-range diesel engine is disjointed with the whole vehicle state, a regeneration process monitoring mechanism is lacked, no regeneration failure recording and counting function exists, and no closed-loop processing strategy exists after regeneration failure exists are solved. The method comprises the steps that a regeneration request condition is set according to regeneration related parameters, when the regeneration request condition meets a preset ECU regeneration requirement, an ECU sends a regeneration request signal to a VCU, a VCU regeneration precondition is set according to engine working condition parameters, and when the VCU regeneration precondition meets a preset regeneration precondition, it is judged that VCU regeneration is triggered; the VCU adjusts the power take-off mode and sends a regeneration permission signal to the ECU. The invention further discloses an extended range diesel engine regeneration and whole vehicle power cooperative control system. Regeneration triggering of the extended-range diesel engine is associated with the whole vehicle state, and regeneration effectiveness is improved.

Description

Technical Field

[0001] This invention relates to the field of range-extended vehicle power control technology, and more specifically, to a method and system for coordinated control of range-extended diesel engine regeneration and vehicle power. Background Technology

[0002] The core functions of range-extended diesel engines, such as DPF regeneration, need to be strictly matched with the speed and torque range (typically 1200-2500 rpm, torque of 30-400 N·m during driving regeneration, and torque of 30-80 N·m during parking regeneration), battery SOC (20%-80%), and vehicle power requirements (output power < 70% of rated power). At the same time, they rely on stable power generation to support the regeneration temperature.

[0003] Existing technologies have five major drawbacks: First, regeneration triggering is disconnected from the vehicle's overall status; the ECU requests regeneration based solely on single conditions such as carbon load, making it prone to failure due to insufficient power generation. Second, there is a lack of a regeneration process monitoring mechanism, preventing timely termination of regeneration when power generation is abnormal, leading to component wear. Third, there is no function for recording and statistically analyzing regeneration failures, making fault tracing difficult. Fourth, there is no closed-loop handling strategy after regeneration failure; the regeneration request while parked is unclear, and prolonged neglect can easily lead to serious malfunctions. For example, in one range-extended vehicle, the lack of timely intervention after regeneration failure resulted in a DPF blockage rate of 80% and a DPF ineffective regeneration rate of 40%, increasing maintenance costs threefold. Fifth, during vehicle operation, the limited regeneration power means that the vehicle's power performance or power generation needs cannot perfectly match the regeneration power, leading to mutual interference. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and system for coordinated control of range-extended diesel engine regeneration and vehicle power, which addresses the shortcomings of the existing technology. This method and system solves the technical problems of existing range-extended diesel engine regeneration triggering being disconnected from the vehicle status, lacking a regeneration process monitoring mechanism, lacking regeneration failure recording and statistical functions, and lacking a closed-loop processing strategy after regeneration failure.

[0005] The present invention discloses a method for coordinated control of range-extended diesel engine regeneration and vehicle power, wherein the method is as follows: Step 1: Obtain regeneration-related parameters, set regeneration request conditions according to the regeneration-related parameters, and when the regeneration request conditions meet the preset ECU regeneration requirements, the ECU sends a regeneration request signal to the VCU and proceeds to Step 2. Step 2: Obtain engine operating parameters, set VCU regeneration preconditions according to the engine operating parameters, and when the VCU regeneration preconditions meet the preset regeneration preconditions, determine that VCU regeneration is triggered and proceed to Step 3. Step 3: The VCU adjusts the power output mode and sends a regeneration permission signal to the ECU; Step 4: When the ECU receives the regeneration permission signal, it starts the regeneration function, and the VCU dynamically monitors the engine operating parameters; Step 5: Set regeneration anomaly handling conditions according to the engine operating parameters. When the regeneration anomaly handling conditions meet the preset regeneration anomaly handling requirements, the VCU sends a prohibition signal to the ECU, and the ECU executes a stop regeneration operation. Step 6: The VCU outputs a regeneration error message; Step 7: After completing regeneration, the ECU sends a regeneration success signal to the VCU and clears the relevant regeneration records.

[0006] As a further improvement, in step one, the regeneration-related parameters include the current carbon load, regeneration-related fault codes, cumulative regeneration running time, and cumulative regeneration mileage; the regeneration request conditions are whether the current carbon load is greater than or equal to a preset carbon load threshold, whether the regeneration-related fault codes are preset trigger fault codes, whether the cumulative regeneration mileage is greater than or equal to a preset forced regeneration mileage, and whether the cumulative regeneration running time is greater than or equal to a preset forced regeneration cycle.

[0007] Furthermore, the ECU regeneration requirements are that the current carbon load is greater than or equal to the carbon load threshold, the regeneration-related fault code is a trigger fault code, the cumulative regeneration mileage is greater than or equal to the forced regeneration mileage, and the cumulative regeneration running time is greater than or equal to the forced regeneration cycle.

[0008] Furthermore, in step two, the engine operating parameters include real-time engine speed, real-time engine torque, real-time battery SOC, vehicle power output, and current power generation. The preconditions for VCU regeneration are: whether the real-time engine speed is within a preset speed standard range, whether the engine torque is within a preset torque standard range, whether the real-time battery SOC is within a preset SOC standard range, whether the vehicle power output is less than the output power threshold, whether the power generation is greater than the preset regeneration demand power threshold, and whether the current power generation is greater than or equal to the preset regeneration demand power threshold.

[0009] Furthermore, the pre-regeneration requirements are as follows: the engine real-time speed is within the standard speed range and the engine torque is within the standard torque range, the real-time battery SOC is within the standard SOC range, the vehicle power output is less than the output power threshold, and the power generation is greater than or equal to the regeneration demand power threshold.

[0010] Furthermore, in step three, the power output mode includes setting a peak power limit value for the motor, a stable engine speed value, and a stable engine torque value, and controlling the engine according to the peak power limit value, stable engine speed value, and stable engine torque value to ensure stable regeneration operation.

[0011] Furthermore, in step five, the engine operating parameters include real-time engine speed, real-time engine torque, real-time battery SOC, vehicle power output, and current power generation. The regeneration anomaly handling conditions include whether the current power generation is less than a preset minimum threshold and continues for a preset sampling time, whether the real-time engine speed is greater than a preset speed threshold, whether the engine torque is greater than a preset torque threshold, whether the real-time battery SOC is greater than a preset SOC threshold, and whether the vehicle power output is greater than a preset output power threshold. Furthermore, the regeneration anomaly handling requirements are that the current power generation is less than a preset minimum threshold, the continuous sampling time is longer, the real-time speed is greater than the speed threshold, the engine torque is greater than the torque threshold, the real-time battery SOC is greater than the SOC threshold, and the vehicle power output power is greater than the output power threshold.

[0012] Furthermore, in step five, the ECU performs the stop regeneration operation by storing the reason for exiting regeneration and the current time; accumulating the number of regeneration failures; and when the number of regeneration failures is greater than or equal to a preset failure threshold, the ECU sends a parking regeneration request signal to the VCU.

[0013] A range-extended diesel engine regeneration and vehicle power coordination control system, the system includes a VCU, used to output regeneration commands and output regeneration command signals; The vehicle's instrument panel is used to display regeneration information; The ECU is used to receive the regeneration command and apply the above-mentioned method for coordinated control of range-extended diesel engine regeneration and vehicle power to control engine regeneration and display regeneration information on the vehicle's instrument panel.

[0014] Beneficial effects The advantages of this invention are: 1. This invention acquires regeneration-related parameters and sets regeneration request conditions based on these parameters. When the regeneration request conditions meet the preset ECU regeneration requirements, the ECU sends a regeneration request signal to the VCU. It also acquires engine operating parameters and sets VCU regeneration preconditions based on these parameters. When the VCU regeneration preconditions meet the preset regeneration preconditions, VCU regeneration is triggered. This invention thus establishes a correlation between the range extender diesel engine regeneration trigger and the vehicle's overall status, improving regeneration effectiveness and increasing the regeneration temperature compliance rate.

[0015] 2. This invention adjusts the power output mode through the VCU and sends a regeneration permission signal to the ECU; when the ECU receives the regeneration permission signal, it starts the regeneration function, and the VCU dynamically monitors the engine operating parameters; this improves the effectiveness of regeneration, increases the regeneration temperature compliance rate, and establishes a sound monitoring mechanism for the regeneration process.

[0016] 3. This invention sets regeneration anomaly handling conditions based on engine operating parameters. When the regeneration anomaly handling conditions meet the preset regeneration anomaly handling requirements, the VCU sends a prohibition signal to the ECU, and the ECU executes a stop regeneration operation. The ECU executes the stop regeneration operation by storing the reason for exiting regeneration and the current time; accumulating the number of regeneration failures. When the number of regeneration failures is greater than or equal to a preset failure threshold, the ECU sends a parking regeneration request signal to the VCU, realizing the function of recording and statistically analyzing regeneration failures, making fault tracing efficient and shortening the troubleshooting time for maintenance personnel.

[0017] 4. This invention achieves closed-loop risk control by outputting regeneration abnormality warning information from the VCU and sending a parking regeneration request signal to the VCU when the ECU performs a stop regeneration operation, thus avoiding serious faults such as DPF blockage and reducing potential maintenance costs. Attached Figure Description

[0018] Figure 1 This is a flowchart of the range-extended diesel engine regeneration and vehicle power coordination control method of the present invention; Figure 2 This is a structural diagram of the range-extended diesel engine regeneration and vehicle power coordination control system of the present invention. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. See Figures 1-2 ,like Figure 1 As shown, the present invention provides a method for coordinated control of range-extended diesel engine regeneration and vehicle power, wherein the method is as follows: Step 1: Obtain regeneration-related parameters, set regeneration request conditions based on the regeneration-related parameters, and when the regeneration request conditions meet the preset ECU regeneration requirements, the ECU sends a regeneration request signal to the VCU and proceeds to Step 2.

[0020] In step one, the regeneration-related parameters include the current carbon load, regeneration-related fault codes, cumulative regeneration running time, and cumulative regeneration mileage. The regeneration request conditions are whether the current carbon load is greater than or equal to the preset carbon load threshold, whether the regeneration-related fault codes are preset trigger fault codes, whether the cumulative regeneration mileage is greater than or equal to the preset forced regeneration mileage, and whether the cumulative regeneration running time is greater than or equal to the preset forced regeneration cycle.

[0021] In this embodiment, the carbon loading threshold is 4 g / L, the trigger fault code is P2453, the forced regeneration mileage is 10,000 km, and the forced regeneration cycle is 30 days. The request signal includes the trigger reason and the current carbon loading data.

[0022] The ECU regeneration requirements are that the current carbon load is greater than or equal to the carbon load threshold, the regeneration-related fault code is a trigger fault code, the cumulative mileage of regeneration is greater than or equal to the forced regeneration mileage, and the cumulative regeneration running time is greater than or equal to the forced regeneration cycle.

[0023] Step 2: Obtain engine operating parameters, set VCU regeneration preconditions based on engine operating parameters, and determine that VCU regeneration is triggered and proceed to Step 3 when the VCU regeneration preconditions meet the preset regeneration preconditions.

[0024] In step two, the engine operating parameters include real-time engine speed, real-time engine torque, real-time battery SOC, vehicle power output, and current power generation. The preconditions for VCU regeneration are: whether the real-time engine speed is within a preset speed standard range, whether the engine torque is within a preset torque standard range, whether the real-time battery SOC is within a preset SOC standard range, whether the vehicle power output is less than the output power threshold, whether the power generation is greater than the preset regeneration power demand threshold, and whether the current power generation is greater than or equal to the preset regeneration power demand threshold. This establishes a correlation between the range-extended diesel engine regeneration trigger and the vehicle status, improving regeneration effectiveness and increasing the regeneration temperature compliance rate.

[0025] In this embodiment, the standard speed range is 1200rpm-2500rpm, the standard torque range during driving regeneration is 30-400N·m, the standard torque range during parking regeneration is 30-80 N·m, the standard SOC range is 20%-80%, the output power threshold is 70% of the vehicle's rated output power, and the regeneration power demand threshold is 90% of the regeneration power demand.

[0026] The pre-regeneration requirements are: the engine real-time speed is within the standard speed range and the engine torque is within the standard torque range, the real-time battery SOC is within the standard SOC range, the vehicle power output is less than the output power threshold, and the power generation is greater than or equal to the regeneration demand power threshold.

[0027] Step 3: The VCU adjusts the power output mode and sends a regeneration permission signal to the ECU.

[0028] In step three, the power output mode includes setting the motor peak power limit, engine speed stability value, and engine torque stability value. The engine is controlled based on these values ​​to ensure stable regeneration operation. Once stable regeneration is ensured, a "regeneration permission signal" is sent to the ECU, containing the minimum power generation threshold for the regeneration process (e.g., 15kW).

[0029] Step 4: Once the ECU receives the regeneration permission signal, it initiates the regeneration function and simultaneously sends regeneration progress feedback to the VCU. The VCU dynamically monitors engine operating parameters at 100ms intervals. This improves regeneration effectiveness, increases the regeneration temperature compliance rate, and establishes a comprehensive monitoring mechanism for the regeneration process.

[0030] Step 5: Set the regeneration anomaly handling conditions according to the engine operating parameters. When the regeneration anomaly handling conditions meet the preset regeneration anomaly handling requirements, the VCU sends a regeneration prohibition signal to the ECU, and the ECU executes the regeneration stop operation. The regeneration prohibition signal indicates the reason for the stop (such as "insufficient power generation").

[0031] In step five, the engine operating parameters include real-time engine speed, real-time engine torque, real-time battery SOC, vehicle power output, and current power generation.

[0032] The regeneration anomaly handling conditions include whether the current power generation is less than a preset minimum threshold and continues for a preset sampling time, whether the real-time engine speed is greater than a preset speed threshold, whether the engine torque is greater than a preset torque threshold, whether the real-time battery SOC is greater than a preset SOC threshold, and whether the vehicle's power output is greater than a preset output power threshold. In this embodiment, the sampling time is 200ms.

[0033] The requirements for handling regeneration anomalies are: the current power generation is less than the preset minimum threshold, the sampling time is continuous, the real-time speed is greater than the speed threshold, the engine torque is greater than the torque threshold, the real-time battery SOC is greater than the SOC threshold, and the vehicle power output is greater than the output power threshold.

[0034] In step five, the ECU executes the stop regeneration operation by storing the reason for exiting regeneration and the current time; accumulating the number of regeneration failures (not reset within the same carbon load cycle); and when the number of regeneration failures is greater than or equal to a preset failure threshold, the ECU sends a parking regeneration request signal to the VCU. In this embodiment, the failure threshold is 3 times. This achieves the function of recording and statistically analyzing regeneration failures, making fault tracing efficient and shortening the troubleshooting time for maintenance personnel.

[0035] Step 6: VCU outputs a regeneration error message.

[0036] For example, if the VCU prerequisites in step two are not met, guidance information will be displayed (such as "SOC is too low, it is recommended to charge for 30 minutes and then regenerate" or "Current power demand is high, please drive gently").

[0037] For example, in step five, when receiving a parking regeneration request, the system displays "Regeneration failed 3 times, please switch to P gear to trigger parking regeneration," accompanied by a yellow light.

[0038] For example, if a parking regeneration request is not executed within 72 hours (a preset time): the VCU reports "Parking regeneration not responding" to the ECU, the ECU triggers a fault code (such as P2463), the VCU control instrument displays "DPF regeneration fault, please execute parking regeneration immediately," accompanied by flashing red lights and a buzzer alarm, while simultaneously limiting the diesel engine's maximum power to 50% of its rated power. This achieves scenario-based guidance, improving driving regeneration power and parking regeneration execution response rate. It realizes closed-loop risk control, avoids serious faults such as DPF blockage, and reduces potential maintenance costs.

[0039] Step 7: After completing regeneration, the ECU sends a regeneration success signal to the VCU and clears the relevant regeneration records.

[0040] like Figure 2 As shown, a range-extended diesel engine regeneration and vehicle power coordination control system is disclosed. This system includes: The VCU (Variable Regeneration Unit) is used to output regeneration commands and signals. The multi-unit VCU includes a SOC (State of Charge) calculation module, a long-term degradation adaptation unit, a diesel engine regeneration precondition determination unit, and a regeneration process dynamic monitoring unit. The dynamic monitoring unit collects the generator power signal in real time, compares it with the regeneration demand power threshold, and outputs a regeneration prohibition / permission command.

[0041] The vehicle instrument cluster displays regeneration information. It includes a regeneration guidance prompt unit and a fault alarm unit, supporting regeneration guidance, failure reason display, parking request prompts, and audible and visual fault alarms.

[0042] The ECU is used to receive regeneration commands and apply the aforementioned range-extended diesel engine regeneration and vehicle power coordination control method to control engine regeneration and display regeneration information on the vehicle's instrument panel.

[0043] The ECU includes a regeneration request triggering module, a regeneration execution module, and a regeneration status recording and statistics unit. The recording unit stores the reason for each regeneration exit (such as "insufficient power generation" or "excessive speed"), the failure time, and the cumulative number of times. Once a threshold is reached, a parking regeneration request is generated.

[0044] This invention achieves: 1. Dynamic monitoring of power generation during regeneration, timely termination of ineffective regeneration; 2. Accurate recording of the causes and number of regeneration failures, supporting fault tracing; 3. Active request for parking regeneration based on the number of failures, forming a closed-loop processing mechanism; 4. Forced fault alerts when parking regeneration has not been executed for an extended period, preventing the risk from escalating.

[0045] The present invention also provides two specific embodiments for ease of understanding.

[0046] Example 1: Scenario of Insufficient Regenerative Thermal Power Generation by Vehicle After a range-extended truck has traveled 800km, the ECU detects a carbon load of 11g / L and sends a regeneration request. The VCU determines that the current diesel engine speed is 2000rpm, torque is 60N·m, SOC is 70%, power output is 50%, and power generation is 18kW (regeneration requirement is 15kW), which meets the conditions and sends a permission signal. Ten minutes after regeneration begins, the vehicle climbs a hill, causing a sudden increase in power demand, and the power generation drops to 13kW for 300ms. The VCU sends a "regeneration prohibited" signal (reason: insufficient power generation). The ECU records the information and accumulates one failure, and the instrument panel displays "Regeneration paused, current power generation is insufficient, it is recommended to retry on a flat road".

[0047] Example 2: Failure Count Exceeded and Parking Regeneration Failure Scenario Similar to the aforementioned vehicle, the subsequent two regeneration attempts failed due to insufficient power generation caused by road conditions. The ECU accumulated three failures and sent a parking regeneration request. The VCU control instrument displayed "Regeneration failed 3 times, please switch to P gear to trigger parking regeneration" (yellow warning). After 72 hours, the driver did not execute the command, and the ECU triggered fault code PXXXX. The instrument displayed a red warning "DPF regeneration failure, please execute parking regeneration immediately." The buzzer sounded continuously, and the maximum power of the diesel engine was limited to 50% of the rated power until the driver executed parking regeneration and successfully completed it. The limitation was then lifted, and the record was cleared.

[0048] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for coordinated control of range-extended diesel engine regeneration and vehicle power, characterized in that, The method is as follows: Step 1: Obtain regeneration-related parameters, set regeneration request conditions according to the regeneration-related parameters, and when the regeneration request conditions meet the preset ECU regeneration requirements, the ECU sends a regeneration request signal to the VCU and proceeds to Step 2; Step 2: Obtain engine operating parameters, set VCU regeneration preconditions according to the engine operating parameters, and when the VCU regeneration preconditions meet the preset regeneration preconditions, determine that VCU regeneration is triggered and proceed to Step 3. Step 3: The VCU adjusts the power output mode and sends a regeneration permission signal to the ECU; Step 4: When the ECU receives the regeneration permission signal, it starts the regeneration function, and the VCU dynamically monitors the engine operating parameters; Step 5: Set regeneration anomaly handling conditions according to the engine operating parameters. When the regeneration anomaly handling conditions meet the preset regeneration anomaly handling requirements, the VCU sends a prohibition signal to the ECU, and the ECU executes a stop regeneration operation. Step 6: The VCU outputs a regeneration error message; Step 7: After completing regeneration, the ECU sends a regeneration success signal to the VCU and clears the relevant regeneration records.

2. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 1, characterized in that, In step one, the regeneration-related parameters include the current carbon load, regeneration-related fault codes, cumulative regeneration running time, and cumulative regeneration mileage; the regeneration request conditions are whether the current carbon load is greater than or equal to a preset carbon load threshold, whether the regeneration-related fault codes are preset trigger fault codes, whether the cumulative regeneration mileage is greater than or equal to a preset forced regeneration mileage, and whether the cumulative regeneration running time is greater than or equal to a preset forced regeneration cycle.

3. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 2, characterized in that, The ECU regeneration requirements are that the current carbon load is greater than or equal to the carbon load threshold, the regeneration-related fault code is a trigger fault code, the cumulative regeneration mileage is greater than or equal to the forced regeneration mileage, and the cumulative regeneration running time is greater than or equal to the forced regeneration cycle.

4. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 1, characterized in that, In step two, the engine operating parameters include real-time engine speed, real-time engine torque, real-time battery SOC, vehicle power output, and current power generation. The preconditions for VCU regeneration are: whether the real-time engine speed is within a preset speed standard range, whether the engine torque is within a preset torque standard range, whether the real-time battery SOC is within a preset SOC standard range, whether the vehicle power output is less than the output power threshold, whether the power generation is greater than the preset regeneration demand power threshold, and whether the current power generation is greater than or equal to the preset regeneration demand power threshold.

5. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 4, characterized in that, The pre-regeneration requirements are as follows: the engine real-time speed is within the standard speed range and the engine torque is within the standard torque range, the real-time battery SOC is within the standard SOC range, the vehicle power output is less than the output power threshold, and the power generation is greater than or equal to the regeneration demand power threshold.

6. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 1, characterized in that, In step three, the power output mode includes setting a peak power limit value for the motor, a stable engine speed value, and a stable engine torque value. The engine is controlled according to the peak power limit value, the stable engine speed value, and the stable engine torque value to ensure stable regeneration operation.

7. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 1, characterized in that, In step five, the engine operating parameters include real-time engine speed, real-time engine torque, real-time battery SOC, vehicle power output, and current power generation. The regeneration anomaly handling conditions include whether the current power generation is less than a preset minimum threshold and continues for a preset sampling time, whether the real-time engine speed is greater than a preset speed threshold, whether the engine torque is greater than a preset torque threshold, whether the real-time battery SOC is greater than a preset SOC threshold, and whether the vehicle power output is greater than a preset output power threshold.

8. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 7, characterized in that, The regeneration anomaly handling requirements are that the current power generation is less than the preset minimum threshold, the sampling time is continuous, the real-time speed is greater than the speed threshold, the engine torque is greater than the torque threshold, the real-time battery SOC is greater than the SOC threshold, and the vehicle power output is greater than the output power threshold.

9. The method for coordinated control of range-extended diesel engine regeneration and vehicle power according to claim 1, characterized in that, In step five, the ECU performs the stop regeneration operation by storing the reason for exiting regeneration and the current time; accumulating the number of regeneration failures; and when the number of regeneration failures is greater than or equal to a preset failure threshold, the ECU sends a parking regeneration request signal to the VCU.

10. A range-extended diesel engine regeneration and vehicle power coordination control system, characterized in that, The system includes a VCU, which is used to output regeneration commands and output regeneration command signals; The vehicle's instrument panel is used to display regeneration information; The ECU is used to receive the regeneration command and apply the range-extended diesel engine regeneration and vehicle power coordination control method according to any one of claims 1-9 to control engine regeneration and display regeneration information on the vehicle instrument panel.

Images