Range-extending power generation control device and method for range-extending vehicle

Abstract

The invention discloses a range-extending power generation control device and method for a range-extending vehicle, and the method comprises the steps: enabling the vehicle to enter a mute mode when responding to a mute instruction, enabling a range extender to operate at an NVH optimized working condition point through responding to a first torque request and a first rotating speed request, and enabling the range extender to operate at an NVH optimized working condition point; meanwhile, the range extender is controlled to be switched to a sub-mode in a mute mode according to the current electric quantity state of the battery; and when the mute instruction is not responded, the vehicle enters a normal mode, the range extender is made to operate at the minimum oil consumption rate working condition point by responding to the second torque request and the second rotating speed request, and meanwhile the range extender is controlled to be switched to a sub-mode in the normal mode according to the current electric quantity state of the battery. The problems of high noise and poor user experience caused by neglecting the NVH demand in the power generation control of the existing extended-range automobile are solved, and meanwhile, the low oil consumption demand and battery protection are considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile power generation control, and particularly relates to a range extending power generation control device and method for a range extending vehicle. BACKGROUND

[0002] With the popularity of pure electric vehicles, the problem of short driving range gradually becomes an important constraint factor for users. As a plug-in hybrid vehicle developed on the basis of pure electric vehicles, the range extending vehicle extends the driving range by adding a range extender, and becomes an important vehicle model to solve the problem, but there are still user experience related optimization points in actual application.

[0003] The range extending vehicle refers to a plug-in hybrid vehicle that adds a range extender composed of an engine and a generator directly connected to the engine on the basis of a pure electric vehicle. The range extender can charge the power battery or directly drive the motor, thereby increasing the driving range of the vehicle. The range extender is a key component of energy control of the range extending vehicle, and NVH (Noise, Vibration, Harshness) is an important index for measuring the sound quality performance of noise and vibration during vehicle driving.

[0004] The existing power generation control method of the range extending vehicle takes the oil-electricity conversion efficiency as the control core. On the range extender MAP scanning point, the lowest fuel consumption rate working condition point under each working condition is selected as the running curve to realize the goal that the range extender of the range extending vehicle has the highest power generation efficiency and the best fuel consumption performance under different power demands.

[0005] However, it is found in research that the existing power generation control method of the range extending vehicle only focuses on the oil-electricity conversion efficiency and fuel consumption, ignores the demand and requirement of NVH, and causes the range extender to generate a large noise in actual operation, which causes some customer groups sensitive to noise to be annoyed, causes the user to have sensitive anxiety to the sound, and reduces the user experience. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a range extending power generation control device and method for a range extending vehicle, which solves the problem that the existing range extending vehicle power generation control ignores the demand of NVH, causes a large noise, and has poor user experience by setting two sets of range extender running curves of silent mode and normal mode, multiple control modules cooperative response instructions, and sub-mode adaptive adjustment based on the state of electricity, and simultaneously considers the low fuel consumption demand and battery protection.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: In a first aspect, the application provides a range-extending power generation control method for a range-extending vehicle, comprising: when responding to a mute instruction, the vehicle enters a mute mode, and the range-extender is operated at an NVH optimization operating point by responding to a first torque request and a first rotating speed request, while the range-extender is switched to a sub-mode in the mute mode according to the current state of charge of the battery; When the mute instruction is not responded to, the vehicle enters a normal mode, and the range-extender is operated at a minimum fuel consumption rate operating point by responding to a second torque request and a second rotating speed request, while the range-extender is switched to a sub-mode in the normal mode according to the current state of charge of the battery. The sub-modes in the mute mode and the normal mode are classified into a pure electric mode, a balance mode, a compensation mode, and a forced mode.

[0008] As a further technical solution, the mute instruction follows a CAN protocol and relies on real-time communication between the first control module and the second control module, the third control module, and the fourth control module, and the communication data between the first control module and the second control module, the third control module, and the fourth control module is collected by a T-BOX and uploaded to the cloud.

[0009] As a further technical solution, the mute instruction is divided into two types, namely a control instruction received from a terminal device or a voice instruction received from a driver, and the control instruction of the terminal device has a higher priority than the voice instruction of the driver, while a mutual exclusion mechanism is preset, and when the control instruction of the terminal device is responded to, the voice instruction is temporarily shielded until the response to the control instruction of the terminal device is completed.

[0010] As a further technical solution, when the vehicle is in the mute mode, if the current state of charge of the battery is greater than or equal to 20%, the range-extender enters the pure electric mode in the mute mode, the vehicle is powered by the power battery, and the range-extender is not started; if the current state of charge of the battery is greater than or equal to 15% and less than 20%, the range-extender is started and enters the balance mode in the mute mode, and the power generation power of the range-extender is the same as the demand power of the vehicle.

[0011] As a further technical solution, if the current state of charge of the battery is greater than or equal to 10% and less than 15%, the range-extender enters the compensation mode in the mute mode, the range-extender increases the power generation power to charge the power battery while meeting the demand power of the vehicle; and if the current state of charge of the battery is less than 10%, the range-extender enters the forced mode in the mute mode, the range-extender increases the power generation power to quickly supplement the power of the power battery, and the power output of the vehicle is limited to meet the daily driving.

[0012] As a further technical solution, when the vehicle is in the normal mode, if the current battery state of charge is greater than or equal to 20%, the range extender enters the normal mode of pure electric mode, the vehicle is powered by the power battery, and the range extender is not started; if the current battery state of charge is greater than or equal to 15% and less than 20%, the range extender is started and enters the normal mode of balance mode, and the power generation power of the range extender is the same as the demand power of the vehicle.

[0013] As a further technical solution, if the current battery state of charge is greater than or equal to 10% and less than 15%, the range extender enters the normal mode of compensation mode, the range extender increases the power generation power to charge the power battery while meeting the demand power of the vehicle; if the current battery state of charge is less than 10%, the range extender enters the normal mode of forced mode, the range extender increases the power generation power to quickly supplement the power battery, and the vehicle power output is limited to meet the daily driving.

[0014] As a further technical solution, the NVH preferred operating point is obtained by comprehensively measuring the noise and vibration data in the vehicle and combining the subjective evaluation under the dynamic state, and the minimum fuel consumption rate operating point is determined by selecting the operating point with the minimum fuel consumption rate in each operating condition on the range extender MAP scanning point.

[0015] In a second aspect, the application provides a range extending power generation control device of a range extending vehicle, comprising: a first control module and a second control module, a third control module and a fourth control module in communication connection with the first control module. The first control module is used for controlling the vehicle to enter the silent mode in response to the silent instruction, and is used for sending control instructions to the second control module, the third control module and the fourth control module; the second control module is used for responding to the control instructions sent by the first control module to control the engine to meet the power output demand; the third control module is used for responding to the control instructions sent by the first control module to start the engine or generate direct current; and the fourth control module is used for detecting the state of charge and feeding back to the first control module.

[0016] As a further technical solution, the first control module sends a first torque request and a first speed request in the silent mode, so that the range extender works based on the operating curve formed by the NVH preferred operating point; the first control module sends a second torque request and a second speed request in the normal mode, so that the range extender works based on the operating curve formed by the minimum fuel consumption rate operating point; and the first control module can respond to the control instructions of the terminal device and the voice instructions of the driver, and set the priority of the control instructions of the terminal device to be higher than that of the voice instructions.

[0017] The one or more technical solutions of the application have the following beneficial effects: 1. The application sets two sets of range extender operation curves in silent mode and normal mode, the normal mode continues the control logic with the lowest fuel consumption rate as the core, ensuring the demand for low fuel consumption of most users; the silent mode selects the NVH optimal operating point based on the comprehensive vehicle noise, vibration data and dynamic subjective evaluation, effectively solving the problem of high noise of the range extender in the prior art, relieving the anxiety of users sensitive to noise, and covering the demand of different users for vehicle economy and sound quality. Both low fuel consumption and high quality NVH performance are considered to meet the needs of multiple users.

[0018] 2. The application cooperates the first control module HCU, the second control module ECU, the third control module GCU and the fourth control module BMS, the HCU can accurately respond to the silent instruction (terminal device control instruction or driver voice instruction, and the terminal control instruction has higher priority and prevents misoperation), and controls the ECU and the GCU to adjust the range extender operating state, and the BMS detects the battery power state in real time, ensures that the mode switching logic is clear and stable, avoids instruction conflict or control failure, and improves the vehicle operation reliability.

[0019] 3. In the silent mode and the normal mode, the application divides four sub-modes of pure electricity, balance, compensation and forced according to the battery power state, and the range extender can adaptively adjust the power generation. It not only ensures the pure electricity driving experience when the power state is sufficient, but also maintains the power balance, supplements the power or avoids the battery over-discharge when the power state is insufficient, and reasonably limits the power output in the forced mode to protect the battery, so as to balance the endurance, power performance and battery life. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the application form part of the application and serve to provide further understanding of the application. The schematic embodiments of the application and their descriptions are used to explain the application and do not constitute an improper limitation on the application.

[0021] Figure 1 The communication logic diagram of each module in the range extension power control device of the application; Figure 2 The range extender operation curve comparison schematic diagram in the silent mode and the normal mode of the application; Figure 3 The switching logic diagram of each sub-mode of the application; DETAILED DESCRIPTION It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise specified, all technical and scientific terms used in the application have the same meaning as generally understood by those skilled in the art to which the application belongs.

[0022] Example one AsFigure 1 As shown, the embodiment provides a range extender vehicle range extender power generation control device for implementing the range extender vehicle range extender power generation control method provided in embodiment two, comprising: a first control module HCU and a second control module ECU, a third control module GCU and a fourth control module BMS in communication connection with the first control module HCU.

[0023] The first control module is responsible for the start and stop of the range extender, the control of the range extender power generation, is used to control the vehicle to enter the silent mode after responding to the silent instruction, and is used to send control instructions to the second control module, the third control module. The second control module is used to respond to the control instructions sent by the first control module to control the engine to meet the power output demand, specifically: responsible for engine control, including supercharging control, throttle, VVT, etc., receiving crankshaft position sensor, camshaft position sensor, intake pressure sensor, etc. Signals, control the engine to work normally and meet the power output demand. The third control module is used to respond to the control instructions sent by the first control module, is responsible for the control of the generator, receives the HCU instruction, the internal sensor signal of the controller and the motor feedback speed signal, drives the IGBT switch to act to control the generator to run, is used to start the engine or generate direct current to meet the needs of battery charging, accessory power supply, etc. The fourth control module is used to detect the state of the electric quantity and feed back to the first control module, and control the range extender to enter different sub-modes.

[0024] In the embodiment, the first control module sends the first torque request and the first speed request in the silent mode, which can make the range extender work based on the operation curve formed by the NVH preferred working condition point; sends the second torque request and the second speed request in the normal mode, which can make the range extender work based on the operation curve formed by the lowest fuel consumption rate working condition point; and the first control module can respond to the control instructions of the terminal device and the voice instructions of the driver, and set the priority of the control instructions of the terminal device to be higher than that of the voice instructions.

[0025] Embodiment two The application provides a range extender vehicle range extender power generation control method, and the specific control method is as follows: When the first control module (HCU) responds to a mute command, it controls the vehicle to enter mute mode. In mute mode, the first control module (HCU) controls the second control module (ECU) and the third control module (GCU) to send a first torque request and a first speed request. The second control module (ECU) and the third control module (GCU) respond to the first torque request and the first speed request sent by the first control module (HCU), causing the vehicle's range extender to operate with the NVH (Noise, Vibration, and Harshness) optimal operating condition as the operating curve. At the same time, the fourth control module (BMS) detects the current battery charge status and feeds it back to the first control module (HCU). Based on the current battery charge status, the first control module (HCU) controls the range extender to switch to a sub-mode within mute mode. The sub-modes within mute mode include pure electric mode, balanced mode, compensated mode, and forced mode.

[0026] In this embodiment, the mute command follows the CAN protocol and relies on real-time communication between the first control module and the second, third, and fourth control modules. The communication data between the first control module and the second, third, and fourth control modules is collected by the T-BOX and uploaded to the cloud. Users can query the range extender's operating status and operating data through the cloud or mobile terminal.

[0027] There are two types of mute commands: control commands received from the terminal device or voice commands received from the driver. Control commands from the terminal device have higher priority than voice commands because they are usually more explicit and less prone to misoperation. A pre-set mutual exclusion mechanism is also implemented: when responding to a control command from the terminal device, the voice command is temporarily muted until the terminal device's control command response is complete. This ensures that only one type of command can be executed at a time. For example, if the driver presses the mute button, the system will immediately enter mute mode even if it is processing other voice commands. Terminal device control commands include, but are not limited to, physical buttons or large screen operations.

[0028] In this embodiment, as Figure 2 As shown, the X-axis represents the range extender's operating speed (rpm), the Y-axis represents the range extender's torque (Nm), the black line represents the constant fuel-to-electric conversion rate (kWh / L) curve, the white line represents the constant power curve, and the red line represents the range extender's lowest fuel consumption rate operating curve. The yellow line represents the operating curve based on the optimal NVH (Noise, Vibration, and Harshness) operating point. The optimal NVH operating point is obtained by comprehensively measuring in-vehicle noise and vibration data and combining it with subjective evaluation under dynamic conditions. The lowest fuel consumption rate operating point is determined by selecting the operating point with the lowest fuel consumption rate under each operating condition from the range extender's MAP (Modular Mapping) scan points.

[0029] The specific engine parameters corresponding to the optimal NVH operating point are shown in the table below:

[0030] In the present embodiment, when the vehicle is in the silent mode, if the current state of charge of the battery is greater than or equal to 20%, the range extender enters the silent mode pure electric mode, the vehicle is powered by the power battery, and the range extender is not started; if the current state of charge of the battery is greater than or equal to 15% and less than 20%, the range extender is started and enters the silent mode balance mode, and the power generation power of the range extender is the same as the demand power of the vehicle, and the battery charge is maintained in balance.

[0031] If the current state of charge of the battery is greater than or equal to 10% and less than 15%, the range extender enters the silent mode compensation mode, the range extender increases the power generation power, charges the power battery while meeting the demand power of the vehicle; if the current state of charge of the battery is less than 10%, the range extender enters the silent mode forced mode, at this time the battery charge is low, the battery discharge is limited, the range extender increases the power generation power as much as possible to quickly supplement the power battery charge, the vehicle power output is limited and cannot meet the high power output, only meets the daily driving.

[0032] When the first control module HCU does not respond to the silent instruction, the vehicle is controlled to enter the normal mode, in the normal mode, the first control module HCU controls the second control module ECU and the third control module GCU (sends the second torque request and the second speed request) respectively, the second control module ECU and the third control module GCU respond to the second torque request and the second speed request sent by the first control module HCU, so that the range extender of the vehicle works at the lowest fuel consumption rate operating point as the operating curve, at the same time, the fourth control module BMS detects the current state of charge of the battery and feeds back to the first control module HCU, and according to the current state of charge of the battery, the range extender is controlled to switch to the sub-mode in the normal mode. Among them, the sub-mode in the normal mode is the same as the silent mode, and is also divided into pure electric mode, balance mode, compensation mode and forced mode.

[0033] In the present embodiment, when the vehicle is in the normal mode, if the current state of charge of the battery is greater than or equal to 20%, the range extender enters the normal mode pure electric mode, the vehicle is powered by the power battery, and the range extender is not started; if the current state of charge of the battery is greater than or equal to 15% and less than 20%, the range extender is started and enters the normal mode balance mode, and the power generation power of the range extender is the same as the demand power of the vehicle, and the battery charge is maintained in balance.

[0034] If the current battery state of charge is greater than or equal to 10% and less than 15%, the range extender enters a compensation mode in the normal mode, the range extender increases the power generation to charge the power battery while meeting the vehicle demand power; if the current battery state of charge is less than 10%, the range extender enters a forced mode in the normal mode, the range extender increases the power generation to quickly supplement the power battery, and the vehicle power output is limited to meet the daily driving.

[0035] The sub-mode exits and enters in reverse, only the threshold is different, which is not described here, and is specifically as shown in Figure 3 .

[0036] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A range-extending power generation control method for a range-extending vehicle, characterized by, Comprise: When responding to the mute instruction, the vehicle enters the mute mode, and the range extender is operated at the NVH optimized working point by responding to the first torque request and the first rotating speed request, and the range extender is switched to the sub-mode in the mute mode according to the current state of charge of the battery; When not responding to the mute instruction, the vehicle enters the normal mode, and the range extender is operated at the minimum fuel consumption rate working point by responding to the second torque request and the second rotating speed request, and the range extender is switched to the sub-mode in the normal mode according to the current state of charge of the battery; The sub-modes in the mute mode and the normal mode are divided into a pure electric mode, a balance mode, a compensation mode and a forced mode.

2. The range extending power generation control method of a range extended vehicle according to claim 1, characterized by, The mute instruction follows the CAN protocol and relies on real-time communication between the first control module and the second control module, the third control module and the fourth control module, and the communication data between the first control module and the second control module, the third control module and the fourth control module is collected by the T-BOX and uploaded to the cloud.

3. The range extending power generation control method of a range extended vehicle according to claim 1, characterized by, The mute instruction is divided into two types, which are the control instruction received by the terminal device or the voice instruction received by the driver, and the control instruction of the terminal device has higher priority than the voice instruction of the driver, and a mutual exclusion mechanism is preset, when responding to the control instruction of the terminal device, the voice instruction is temporarily shielded until the control instruction of the terminal device is responded.

4. The range extending power generation control method of a range extended vehicle according to claim 1, characterized by, When the vehicle is in the mute mode, if the current state of charge of the battery is greater than or equal to 20%, the range extender enters the pure electric mode in the mute mode, the vehicle is driven by the power battery, and the range extender is not started; if the current state of charge of the battery is greater than or equal to 15% and less than 20%, the range extender is started and enters the balance mode in the mute mode, and the power generation power of the range extender is the same as the demand power of the vehicle.

5. The range extending power generation control method of a range extended vehicle according to claim 4, characterized by, If the current state of charge of the battery is greater than or equal to 10% and less than 15%, the range extender enters the compensation mode in the mute mode, the range extender increases the power generation power to charge the power battery while meeting the demand power of the vehicle; if the current state of charge of the battery is less than 10%, the range extender enters the forced mode in the mute mode, the range extender increases the power generation power to quickly charge the power battery, and the power output of the vehicle is limited to meet the daily driving.

6. The range extending power generation control method of a range extended vehicle according to claim 1, characterized by, When the vehicle is in the normal mode, if the current state of charge of the battery is greater than or equal to 20%, the range extender enters the pure electric mode in the normal mode, the vehicle is driven by the power battery, and the range extender is not started; if the current state of charge of the battery is greater than or equal to 15% and less than 20%, the range extender is started and enters the balance mode in the normal mode, and the power generation power of the range extender is the same as the demand power of the vehicle.

7. The range extending power generation control method of a range extended vehicle according to claim 6, characterized by, If the current state of charge of the battery is greater than or equal to 10% and less than 15%, the range extender enters the compensation mode in the normal mode, the range extender increases the power generation power to charge the power battery while meeting the demand power of the vehicle; if the current state of charge of the battery is less than 10%, the range extender enters the forced mode in the normal mode, the range extender increases the power generation power to quickly charge the power battery, and the power output of the vehicle is limited to meet the daily driving.

8. The range extending power generation control method of a range extended vehicle according to claim 1, characterized by, The NVH preferred operating point is obtained by comprehensive measurement of in-vehicle noise and vibration data and subjective evaluation under dynamic conditions, and the minimum fuel consumption rate operating point is determined by selecting the operating point with the minimum fuel consumption rate under each condition on the range extender MAP.

9. A range extending electric power control device of a range extending vehicle, characterized by, Comprise: The first control module and the second control module, the third control module, the fourth control module in communication connection with it; The first control module is used for controlling the vehicle to enter the silent mode after responding to the mute instruction, and is used for sending control instructions to the second control module, the third control module; The second control module is used for responding to the control instruction sent by the first control module to control the engine to meet the power output demand; The third control module is used for responding to the control instruction sent by the first control module, and is used for starting the engine or generating direct current; The fourth control module is used for detecting the power state and feeding back to the first control module.

10. The range extending electric power control device of a range extending vehicle according to claim 9, wherein The first control module sends the first torque request and the first speed request in the silent mode, which can make the range extender work based on the operating curve formed by the NVH preferred operating point; Send the second torque request and the second speed request in the normal mode, which can make the range extender work based on the operating curve formed by the minimum fuel consumption rate operating point; and the first control module can respond to the control instruction of the terminal device and the voice instruction of the driver, and set the priority of the control instruction of the terminal device to be higher than that of the voice instruction.

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