Range extender accessory power closed-loop control method

Abstract

The invention discloses a range extender accessory power closed-loop control method. The method comprises the following steps that S1, a range extender controller generates required power generation power according to the whole vehicle power requirement; s2, according to the required power generation power, the RCU sends a torque control request and a rotating speed control request to an engine ECU and an ISG motor controller through messages; s3, according to the output power of the actual torque percentage fed back by the engine ECU and the actual generated power fed back by the ISG motor controller; and comparing the required generated power with the actual generated power, and adjusting the engine torque percentage to correct the generated power according to the compared difference power. The method has the advantages of reducing the fault false alarm rate, improving the fuel economy and the like.

Description

Technical Field

[0001] This invention relates to the field of engine control technology, and in particular to a closed-loop control method for the power of a range extender accessory. Background Technology

[0002] Currently, the accessory power of the range extender changes along with the operating conditions, causing the RCU to report faults indicating insufficient or excessive power generation, resulting in a high vehicle failure rate. Insufficient or excessive power generation from the range extender affects its actual power output and reduces fuel economy. To address this issue, this patent provides a closed-loop control method for the accessory power of the range extender.

[0003] The above background information is provided only to aid in understanding the concept and technical solution of this invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0004] The main objective of this invention is to propose a closed-loop control method for range extender accessory power that reduces false alarm rate and improves fuel economy.

[0005] Therefore, this invention proposes a closed-loop control method for the power of range extender accessories.

[0006] Preferably, the present invention may also have the following technical features:

[0007] A closed-loop control method for the power of a range extender accessory includes the following steps:

[0008] S1. The range extender controller generates the required power generation capacity based on the vehicle's power requirements.

[0009] S2. Based on the required power generation, the RCU sends torque control requests and speed control requests to the engine ECU and ISG motor controller respectively via messages.

[0010] S3. Based on the actual torque percentage output power fed back by the engine ECU and the actual power generation power fed back by the ISG motor controller, compare the required power generation power with the actual power generation power, and adjust the engine torque percentage to correct the power generation power based on the power difference.

[0011] Furthermore, in step S2, the ECU controls the engine to increase the torque to a preset torque percentage, and the ISG motor controller increases the speed to a preset speed.

[0012] Furthermore, in step S2, a demand power generation model is established based on the engine torque percentage and ISG motor speed.

[0013] Furthermore, in step S3, the engine output power is obtained based on the percentage of torque emitted by the engine, the actual output power of the generator is obtained, the required power generation is compared with the actual output power of the generator, and the difference power between the required power generation and the actual output power of the generator is calculated.

[0014] Furthermore, when the power difference is outside the preset range, the power difference is compensated by adjusting the requested torque percentage, and the engine control torque percentage is corrected for closed-loop control.

[0015] Further, in step S3, the method for correcting the power generation is to establish a torque compensation model of the difference in power and the percentage of engine torque that needs to be compensated by bench testing; based on the torque compensation model, the percentage of engine torque that needs to be compensated is determined by looking up a table according to the difference between the demand power generation and the actual power generation; the corrected engine torque percentage = the compensated torque percentage + the preset torque percentage.

[0016] Furthermore, after the engine torque percentage is corrected, the generator speed remains unchanged.

[0017] Furthermore, the actual torque percentage is transmitted to the RCU via an EEC1 message from the engine ECU.

[0018] The beneficial effects of this invention compared with the prior art include: by using the control methods of the ISG motor electronic control and the engine ECU, and by using the actual torque percentage returned by the ECU and the actual power generation returned by the ISG motor electronic control to achieve closed-loop control of the range extender accessory power, ensuring that the power generation meets the power requirements of the whole vehicle, while reducing the false alarm rate and improving fuel economy. Attached Figure Description

[0019] Figure 1 This is the control flowchart of the present invention.

[0020] Figure 2 This is a structural diagram of the present invention. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope or application of the present invention.

[0022] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0023] like Figure 1 The range extender accessory power closed-loop control method shown in Figure -2 includes the following steps:

[0024] S1. The range extender controller (RCU) generates the required power generation capacity based on the vehicle's power demand.

[0025] S2. Based on the required power generation, the RCU sends torque control requests and speed control requests to the engine ECU and ISG motor controller respectively via messages; the ECU controls the engine to increase the torque to a preset torque percentage, and the ISG motor controller increases the speed to a preset speed;

[0026] In step S2, a demand power generation model is established based on the engine torque percentage and ISG motor speed. In this way, when the RCU issues a demand power generation request, the engine and ISG motor can quickly respond to the corresponding torque percentage and speed according to the power generation model.

[0027] S3. Based on the actual torque percentage output power fed back by the engine ECU and the actual power generation power fed back by the ISG motor controller, compare the required power generation power with the actual power generation power, and adjust the engine torque percentage to correct the power generation power based on the power difference.

[0028] In step S3, the engine output power is obtained based on the percentage of torque emitted by the engine, and the actual output power of the generator is obtained. The required power generation is compared with the actual output power of the generator. If the difference in power is too large, it will cause a false alarm. Therefore, when the power difference is outside the preset range, the power difference is compensated by adjusting the requested torque percentage. This eliminates the need for complex calculations of accessory power consumption, thereby ensuring that the actual power generation covers the accessory power consumption, greatly reducing the deviation between the required power generation and the actual power generation, lowering the false alarm rate, and improving fuel economy. In this embodiment, the current torque percentage of the engine is received, the required power generation is calibrated with the actual power generation, and the engine control torque percentage is corrected for closed-loop control. During the conversion of engine output power to range extender generator output power, some power is consumed by accessories. If the power consumed by accessories is too large, it will lead to a false alarm.

[0029] In step S3, the method for correcting the power generation is to establish a torque compensation model based on the percentage of engine torque needed to compensate for the power difference through bench testing. Based on this model, the percentage of engine torque that needs to be compensated is determined by looking up a table according to the power difference between the required and actual power generation. The corrected engine torque percentage = compensated torque percentage + the percentage of engine torque in step S2 when the ECU responds to the required power generation (preset torque percentage). In other words, when the compensated torque percentage is increased, the generator speed remains the same as the engine speed corresponding to the required power generation; that is, only the engine torque percentage is adjusted, while the generator speed remains unchanged.

[0030] Preferably, the actual torque percentage is transmitted to the RCU via an EEC1 message from the engine ECU.

[0031] Technical principle: The range extender assembly uses a control method where the engine ECU responds to RCU messages for torque control, and the ISG motor electronic control responds to RCU for speed control. It corrects the current power generation based on the power generation power in a closed loop, receives the current torque percentage of the engine, calibrates the required power generation power with the actual power generation power of the generator, and corrects the engine control torque percentage for closed-loop control, including changes in accessory power. This ensures that the power generation power meets the vehicle's power requirements, while reducing false alarm rates and improving fuel economy.

[0032] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0033] Although exemplary embodiments of the invention have been described and illustrated, those skilled in the art will understand that various changes and substitutions can be made thereto without departing from the spirit of the invention. Furthermore, many modifications can be made to adapt specific situations to the doctrine of the invention without departing from the central concepts of the invention described herein. Therefore, the invention is not limited to the specific embodiments disclosed herein, but may include all embodiments and equivalents that fall within the scope of the invention.

Claims

1. A closed-loop control method for the power of a range extender accessory, characterized in that: Includes the following steps: S1. The range extender controller generates the required power generation capacity based on the vehicle's power requirements. S2. Based on the required power generation, the RCU sends torque control requests and speed control requests to the engine ECU and ISG motor controller respectively via messages. S3. Based on the actual torque percentage output power fed back by the engine ECU and the actual power generation power fed back by the ISG motor controller, compare the required power generation power with the actual power generation power, and adjust the engine torque percentage to correct the power generation power based on the power difference.

2. The range extender accessory power closed-loop control method as described in claim 1, characterized in that: In step S2, the ECU controls the engine to increase the torque to a preset torque percentage, and the ISG motor controller increases the speed to a preset speed.

3. The range extender accessory power closed-loop control method as described in claim 1, characterized in that: In step S2, a demand power generation model is established based on the engine torque percentage and ISG motor speed.

4. The range extender accessory power closed-loop control method as described in claim 1, characterized in that: In step S3, the engine output power is obtained based on the percentage of torque emitted by the engine, the actual output power of the generator is obtained, the required power generation is compared with the actual output power of the generator, and the difference power between the required power generation and the actual output power of the generator is calculated.

5. The range extender accessory power closed-loop control method according to claim 1, characterized in that: When the power difference is outside the preset range, the power difference is compensated by adjusting the requested torque percentage, and the engine control torque percentage is corrected for closed-loop control.

6. The range extender accessory power closed-loop control method according to claim 1, characterized in that: In step S3, the method for correcting the power generation is to establish a torque compensation model for the difference in power and the percentage of engine torque that needs to be compensated by bench testing. Based on the torque compensation model, the percentage of torque that the engine needs to compensate is determined by referring to a table based on the difference between the required power generation and the actual power generation. Corrected engine torque percentage = compensated torque percentage + preset torque percentage.

7. The range extender accessory power closed-loop control method according to claim 6, characterized in that: After the engine torque percentage is corrected, the generator speed remains unchanged.

8. The range extender accessory power closed-loop control method according to claim 1, characterized in that: The actual torque percentage is transmitted to the RCU via the EEC1 message from the engine ECU.

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