A control method, system, and hybrid vehicle for a hybrid electric vehicle

Abstract

This invention discloses a control method, system, and hybrid vehicle for a hybrid electric vehicle. The method includes: real-time acquisition of engine-related operating parameters within a current operating mode; wherein the current operating mode is one of N operating modes divided according to engine operating conditions, where N≥6 and is a positive integer; each operating mode is configured with its own cooperative control strategy and jump condition set; the engine-related operating parameters are verified by calling the current jump condition set corresponding to the current operating mode; if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is controlled according to the cooperative control strategy in the target operating mode.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle technology, and more particularly to a control method, system, and hybrid vehicle for a hybrid vehicle. Background Technology

[0002] Hybrid vehicles are typically equipped with two power sources: an engine and a drive motor. They rely on the coordinated output of these two power sources to achieve driving.

[0003] Conventional hybrid vehicles generally adopt a control approach centered on vehicle energy management. They mainly divide the basic drive modes such as pure electric and hybrid based on the vehicle's required torque, the state of charge of the power battery, and fuel economy indicators. Throughout the process, they prioritize the optimal energy consumption by allocating the output power of the engine and drive motor to meet the energy distribution needs of the entire vehicle, while ignoring the constraints of their own operating conditions such as engine temperature control, emissions, fault protection, and on-board diagnostics.

[0004] Therefore, existing technologies only focus on optimizing the vehicle's power output and energy consumption to control the power distribution between the engine and the drive motor. They lack a global control scheme based on the engine's own operating conditions, which can easily lead to an imbalance between the engine's operating state and the vehicle's driving conditions, significantly reducing the smoothness of the vehicle's ride. Summary of the Invention

[0005] To address or partially address the technical problem that existing technologies focus solely on optimizing vehicle power output and energy consumption to control power distribution between the engine and drive motor, lacking a global control scheme based on the engine's own operating conditions, this invention provides a control method, system, and hybrid vehicle for hybrid vehicles. It divides the engine into at least six operating modes according to different operating conditions, each paired with its own independent collaborative control strategy and jump condition set. Status judgment is completed based on relevant engine operating parameters, shifting the focus from vehicle energy management to engine lifecycle management. This improves engine operational reliability, vehicle emission compliance, and overall vehicle ride comfort throughout the entire lifecycle.

[0006] To address the aforementioned technical problems, a first aspect of the present invention discloses a control method for a hybrid vehicle, the method comprising: Within the current operating mode, relevant engine operating parameters are collected in real time; wherein, the current operating mode is one of N operating modes divided according to engine operating conditions, where N≥6 and is a positive integer; each operating mode is configured with its own cooperative control strategy and jump condition set; The engine-related operating parameters are verified by calling the current jump condition set corresponding to the current working mode; If the engine's relevant operating parameters meet any of the jump conditions in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode.

[0007] Optionally, the engine-related operating parameters include one or more of the following: engine status, catalyst temperature, engine fault level, OBD (On-Board Diagnostics) diagnostic request, idle emission request, and vehicle power supply status. The N operating modes include: initial mode, warm-up mode, idle mode, OBD diagnostic mode, torque limiting protection mode, and normal operating mode.

[0008] Optionally, if the current operating mode is the initial mode, and if the engine-related operating parameters satisfy any jump condition within the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the initial mode, if the vehicle power supply status is powered on and the engine status changes from stopped to running, the initial mode is switched to the heating mode. In the heating mode, the clutch is disengaged, the starter motor is turned on, and the engine is controlled to operate at a preset fixed torque and a preset fixed speed.

[0009] Optionally, if the current operating mode is the heating mode, and if the engine-related operating parameters satisfy any jump condition within the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the warming mode, if the idle speed discharge request is received, the warming mode is switched to the idle speed mode; in the idle speed mode, the clutch is disengaged and the engine is controlled to run at the target idle speed. In the heating mode, if no idle emission request is received and the catalyst temperature reaches the first set temperature threshold, the heating mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, and the engine torque is prohibited from being limited. The output torque of the engine and the drive motor is coordinated and distributed with the goal of optimizing the overall energy consumption of the vehicle.

[0010] Optionally, if the current operating mode is the idling mode, and if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the idle mode, if the idle emission request is not received or the idle emission request reception times out, the idle mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, the engine torque is restricted, and the output torque of the engine and drive motor is coordinated to optimize the overall energy consumption of the vehicle.

[0011] Optionally, if the current operating mode is the normal operating mode, and if the engine-related operating parameters satisfy any jump condition within the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: Within the normal operating mode, if the engine state changes from running to stopped, the normal operating mode is switched back to the initial mode; within the initial mode, the clutch is disengaged. In the normal working mode, if the OBD diagnostic request is received, the normal working mode is switched to the OBD diagnostic mode; in the OBD diagnostic mode, the clutch is disengaged, the starter motor is turned on, and the engine is controlled with the constraints that the engine output torque is less than the OBD torque threshold and the engine torque change difference is less than the OBD torque difference threshold. On-board diagnostic tests are performed on the three-way catalytic converter and oxygen sensor outside the engine and the diagnostic results are stored. In the normal operating mode, if a preset level of engine fault is received or the catalytic converter temperature is greater than or equal to a second set temperature threshold, the normal operating mode is switched to the torque limiting protection mode. In the torque limiting protection mode, the clutch is controlled to close, the engine is controlled to run within the set torque limiting threshold, and the drive motor is controlled to output torque according to the torque difference corresponding to the engine torque limiting value.

[0012] Optionally, if the current operating mode is the OBD diagnostic mode, and if the engine-related operating parameters meet any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: If no OBD diagnostic request is received in the OBD diagnostic mode, the OBD diagnostic mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, the engine torque is restricted, and the output torque of the engine and drive motor is coordinated to optimize the overall energy consumption of the vehicle.

[0013] Optionally, if the current operating mode is the torque limiting protection mode, and if the engine-related operating parameters satisfy any jump condition within the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the torque limiting protection mode, if no preset engine fault level is received and the catalyst temperature is less than the second set temperature threshold, the torque limiting protection mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, and the torque limiting of the engine is prohibited. The output torque of the engine and the drive motor is coordinated to optimize the overall energy consumption of the vehicle.

[0014] A second aspect of the present invention discloses a control system for a hybrid vehicle, the system comprising: The acquisition module is used to acquire relevant engine operating parameters in real time within the current operating mode; wherein, the current operating mode is one of N operating modes divided according to the engine operating conditions, where N≥6 and is a positive integer; each operating mode is configured with its own cooperative control strategy and jump condition set; The verification module is used to call the current jump condition set corresponding to the current working mode to verify the relevant operating parameters of the engine; The switching module is used to switch the current working mode to the target working mode corresponding to the jump condition if the engine-related operating parameters meet any jump condition in the current jump condition set, and to manage the engine according to the cooperative control strategy in the target working mode.

[0015] A third aspect of the present invention discloses a hybrid vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

[0016] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages: The present invention discloses a control method, system and hybrid vehicle for a hybrid vehicle. At least six working modes are divided according to the engine operating conditions. By collecting relevant engine operating parameters in real time, and calling the exclusive jump condition set corresponding to the current working mode to complete parameter verification, the target working mode suitable for the working condition is switched only when the corresponding jump condition is matched, and then the engine is controlled specifically relying on the collaborative control strategy supporting the target working mode. Different from the traditional control logic that divides the driving mode according to the vehicle energy demand, the technical solution of the present invention realizes the transformation of the control focus from vehicle energy management to the full life cycle management of the engine, completely covering the full life cycle scenarios of engine warm-up, fault diagnosis, torque limit protection, normal driving, and idling. Relying on the engine operating parameters, the mode jump is accurately triggered, and different control means are matched for different engine operating conditions, which can improve the operating reliability of the engine in the full life cycle scenario, the vehicle emission compliance and the vehicle ride comfort.

[0017] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are given below. Brief Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 Shows a schematic structural diagram of a hybrid vehicle according to an embodiment of the present invention; Figure 2 Shows a flowchart of a control method for a hybrid vehicle according to an embodiment of the present invention; Figure 3 Shows a switching logic diagram of each working mode according to an embodiment of the present invention; Figure 4 Shows a schematic diagram of a control system of a hybrid vehicle according to an embodiment of the present invention. Detailed Description of the Embodiments

[0019] The exemplary embodiments of the present invention will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0020] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0021] Firstly, the control method for hybrid vehicles provided in this embodiment of the invention is applied to hybrid vehicles.

[0022] See Figure 1 This is a schematic diagram of the structure of a hybrid vehicle according to an embodiment of the present invention.

[0023] The hybrid vehicle includes: an engine 11, a transmission assembly 12, a starter motor 13, a power battery 14, a DC / DC (Direct Current to Direct Current) converter 15, and a 12V low-voltage battery 16. The transmission assembly 12 includes a clutch 121, a drive motor 122, and a transmission 123.

[0024] The engine 11 is connected in series with the drive motor 122 via the clutch 121; the gearbox assembly 12 transmits mechanical power to the wheels; the starter motor 13 is mechanically connected to the engine 11 and is used to start the engine 11; the power battery 14 is connected to the drive motor 122 and the DC / DC converter 15 respectively. The DC / DC converter 15 converts high voltage to 12V low voltage, and at the same time charges the 12V low voltage battery 16 and supplies power to the vehicle's 12V power grid. The 12V low voltage battery 16 supplies power to the starter motor 13 and all low voltage electrical equipment in the vehicle.

[0025] When clutch 121 is disengaged, power battery 14 supplies electric power to drive motor 122 to drive the wheels alone, achieving pure electric driving. When clutch 121 is engaged, engine 11 and drive motor 122 are power-coupled, and can drive together or only engine 11 can output power. When the vehicle is coasting or braking, drive motor 122 generates electricity in reverse, and the electrical energy is used to charge power battery 14. During the vehicle start-up phase, 12V low-voltage battery 16 drives starter motor 13 to ignite engine 11, and during driving, DC / DC converter continuously ensures low-voltage power supply to the vehicle.

[0026] The above is an introduction to the structure of hybrid vehicles. The following section introduces the control logic of hybrid vehicles.

[0027] like Figure 2 As shown, the control method for a hybrid vehicle provided in this embodiment of the invention includes the following steps: S201 collects relevant engine operating parameters in real time within the current operating mode.

[0028] The current working mode is one of N working modes classified according to different engine operating conditions, where N≥6 and is a positive integer.

[0029] In this embodiment, considering six categories of differentiated operating conditions—engine start-up, catalytic converter warm-up, steady-state idling, on-board fault diagnosis, high-temperature torque limiting due to faults, and normal driving—at least six operating modes are defined, including: initial mode, warm-up mode, idling mode, OBD diagnostic mode, torque limiting protection mode, and normal operating mode. The current operating mode is one of the above six operating modes.

[0030] Each working mode is configured with its own collaborative control strategy and jump condition set. The jump condition set configured for each working state includes one or more jump conditions for jumping from that working state to other working states.

[0031] Engine-related operating parameters include one or more of the following: engine status, catalytic converter temperature, engine fault level, on-board diagnostic (OBD) request, idle emission request, and vehicle power supply status.

[0032] Engine status includes: stopped state and running state. The stopped state means that the engine is not ignited and is running, while the running state means that the engine has been ignited and is running continuously.

[0033] Catalyst temperature, for example, refers to the operating temperature of the carrier of a three-way catalytic converter, which is obtained in real time by temperature sensors located at the front and rear ends of the catalytic converter.

[0034] Engine fault levels typically include Level 1 minor fault and Level 2 torque limiting fault. Once Level 2 torque limiting is triggered, the engine will perform torque limiting operations.

[0035] OBD diagnostic requests are sent from the vehicle controller to the engine controller to drive the exhaust system's three-way catalytic converter and oxygen sensor to perform fault detection and store diagnostic results.

[0036] Idle emission request refers to the command for stable low-speed operation of the engine to meet exhaust emission regulations. It is used to force the engine to maintain idle speed to ensure that exhaust emissions meet the standards.

[0037] The vehicle's power supply status includes either "powered on" or "powered off". "Powered on" indicates that the vehicle's low-voltage and high-voltage power supply circuits are connected, and the vehicle controller can normally collect signals and execute control logic. "Powered off" indicates that the vehicle's power supply circuits are disconnected, and the vehicle controller does not work.

[0038] S202, call the current jump condition set corresponding to the current working mode to verify the relevant operating parameters of the engine.

[0039] During the verification process, the corresponding parameters are called according to the jump conditions in the current jump condition set corresponding to the current working mode, so as to verify that it meets the jump conditions in the current jump condition set.

[0040] See Figure 3 This is a logic diagram for switching between various working modes. Each of the six listed working modes has its own set of transition conditions.

[0041] The initial mode has a first jump condition 1 in its jump condition set.

[0042] The first jump condition 1 is used to trigger the engine to jump from the initial mode to the warm-up mode. Specifically, this occurs when the vehicle is powered on and the engine changes from a stopped state to a running state. Specifically, when the vehicle is powered on and the engine has just started running, it indicates that the catalytic converter temperature has not yet reached the ignition temperature for efficient exhaust gas purification (i.e., the first temperature threshold), and the pollutant conversion capacity is insufficient. Therefore, it is necessary to jump to the warm-up mode to quickly increase the catalytic converter temperature.

[0043] The set of jump conditions corresponding to the heating mode includes the second jump condition 2 and the sixth jump condition 6.

[0044] The second jump condition 2 is used to trigger the engine to switch from warm-up mode to idle mode. Specifically, it involves receiving an idle emission request while the engine is running. The idle emission request triggers the engine to maintain idle speed to complete exhaust emission testing and ensure that emission indicators meet regulatory limits.

[0045] The sixth jump condition is used to trigger the engine to jump from the warm-up mode to the normal operating mode. Specifically, it occurs when the engine is running and no idle emission request is received, and the catalytic converter temperature reaches the first set temperature threshold. When the engine has no idling requirement and the catalytic converter temperature reaches the first set temperature threshold, it indicates that the catalytic converter has a stable and efficient exhaust gas purification capability, and there is no need for continuous warm-up; the engine is capable of normal operation.

[0046] The set of jump conditions corresponding to the idle mode includes a third jump condition, 3.

[0047] The third jump condition 3 is used to trigger the engine to jump from the idle mode to the normal operating mode. Specifically, when the engine is in the running state, the idle emission request is not received or the idle emission request reception times out (the request is invalidated).

[0048] The jump condition set corresponding to the OBD diagnostic mode includes the eighth jump condition, 8.

[0049] Among them, the eighth jump condition 8 is used to trigger the engine to jump from the OBD diagnostic mode to the normal operating mode, specifically: no OBD diagnostic request was received.

[0050] The set of jump conditions corresponding to the torque limiting protection mode includes the ninth jump condition, 9.

[0051] The ninth jump condition (9) triggers the engine to switch from torque-limiting protection mode to normal operating mode. Specifically, it occurs when: no preset engine fault level is received, and the catalytic converter temperature is below the second set temperature threshold. For example, the preset engine fault level is a level 2 torque-limiting fault. If no level 2 torque-limiting fault is received, it indicates that the engine has no moderate fault affecting emissions and requiring torque-limited operation, and the engine is not subject to torque limitation. The catalytic converter temperature being below the second set temperature threshold indicates that the catalytic converter has not overheated. The second set temperature threshold is greater than the first set temperature threshold.

[0052] The jump condition set corresponding to the normal working mode includes jump condition 4, jump condition 5, and jump condition 7.

[0053] The fourth jump condition 4 is used to trigger the engine to jump from normal operating mode to OBD diagnostic mode, specifically: receiving an OBD diagnostic request.

[0054] The fifth jump condition (5) is used to trigger the engine to jump from normal operating mode to torque limiting protection mode. Specifically, it occurs when a preset engine fault level is received or the catalytic converter temperature is greater than or equal to a second set temperature threshold. An example of the preset engine fault level is a level two torque limiting fault. If a level two torque limiting fault is received, it indicates that the engine has a moderate fault that affects emission performance and requires limiting output torque. The vehicle must then enter torque limiting protection mode to prevent the fault from worsening. A catalytic converter temperature greater than or equal to the second set temperature threshold indicates that the catalytic converter has not overheated, but torque limiting operation is required to reduce the catalytic converter temperature.

[0055] The seventh jump condition 7 is used to trigger the engine to jump from the normal operating mode to the initial mode, specifically: the engine state changes from the running state to the stopped state.

[0056] S203, if the engine-related operating parameters meet any of the jump conditions in the current jump condition set, switch the current working mode to the target working mode corresponding to the jump condition, and manage the engine according to the cooperative control strategy in the target working mode.

[0057] Since the current work mode is any one of the above 6 work modes, the meaning of switching between the 6 work modes will be introduced below.

[0058] In one optional implementation, the vehicle's power supply status is monitored in real time. If the vehicle's power supply is detected to be powered on, the engine is controlled to enter the initial mode. In the initial mode, the corresponding cooperative control strategy is invoked, and the following operation is performed: the clutch is disengaged to isolate the power supply. At this time, the engine is in a stopped state.

[0059] In one optional implementation, if the current operating mode is the initial mode, the engine status and the vehicle power supply status are verified using the first jump condition 1.

[0060] In the initial mode, if the vehicle power supply is in the powered-on state and the engine state changes from the stopped state to the running state, it means that the first jump condition 1 is met, and the initial mode is switched to the heating mode.

[0061] Within the heating mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to disengage, start the starter motor to act as a load motor to absorb the excess output power of the engine, and control the engine to operate at a preset fixed torque and a preset fixed speed.

[0062] Specifically, disengaging the clutch decouples the engine from the drive wheels and drive motor, isolating the engine's operating conditions from the vehicle's driving load. Since there is no external driving load constraint, the engine alone cannot simultaneously stabilize torque and speed. Therefore, the starter motor is controlled to function as a load motor, dynamically absorbing the engine's excess output power. Thus, the starter motor no longer only performs the function of engine ignition and starting, but acts as an electronic load, consuming and absorbing the engine's excess output energy to stabilize engine combustion conditions, ensure a continuous constant exhaust temperature, and accelerate the catalytic converter's temperature rise. Furthermore, controlling the engine to continuously output a fixed torque and a fixed speed allows for continuous and stable fuel combustion and the release of a constant amount of heat. With the starter motor continuously absorbing the engine's output power, the engine can maintain steady-state combustion for an extended period, with exhaust flow and temperature remaining consistently within the high-temperature range. This ensures a continuous supply of high-temperature exhaust gas to the three-way catalytic converter, thereby continuously and efficiently increasing the catalytic converter's carrier temperature, shortening the time it takes for the catalytic converter to reach ignition temperature, and significantly reducing exhaust pollutant emissions during cold starts.

[0063] In this embodiment, by constructing a warming mode, when the engine is cold-started and the catalyst has not reached the ignition temperature, the engine is forced to run at a fixed torque and a fixed speed, and the clutch is controlled to disengage to avoid power output interference. The starter motor is controlled to work as a load motor to dynamically absorb the engine's excess output power and stabilize the engine's combustion conditions. This ensures that the catalyst can reach the ignition temperature in a short time, effectively avoiding the emission deterioration caused by frequent engine start-stop, significantly reducing exhaust pollutant emissions during the cold start phase, and meeting increasingly stringent emission regulations.

[0064] In one optional implementation, if the current operating mode is the warm-up mode and the engine is still running, then it is checked whether an idle emission request has been received and / or whether the catalytic converter temperature has reached a first set temperature threshold.

[0065] If the idling emission request is received in the heating mode, it indicates that the second jump condition 2 is met, and the heating mode is switched to the idling mode.

[0066] In the idle mode, the corresponding cooperative control logic is invoked to perform the following operations: control the clutch to disengage, control the engine to run at the target idle speed, and maintain the engine in idle condition.

[0067] Within the heating mode, if no idle emission request is received and the catalytic converter temperature reaches the first set temperature threshold, it indicates that the sixth jump condition 6 is met. At this time, the catalytic converter already possesses stable and efficient exhaust gas purification capabilities, requiring no further heating, and the engine is capable of normal operation. The heating mode is then switched to the normal operation mode.

[0068] Within the normal operating mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to close, prohibit torque limiting of the engine, and collaboratively distribute the output torque of the engine and drive motor with the goal of optimizing the overall energy consumption of the vehicle.

[0069] In one optional implementation, if the current operating mode is the idle mode and the engine is still running, then it is checked whether the idle emission request has been received.

[0070] If the idle emission request is not received in the idle mode or the idle emission request reception times out (request invalidation), it indicates that the third jump condition 3 is met, and the idle mode is switched to the normal working mode.

[0071] Within the normal operating mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to close, prohibit torque limiting of the engine, and collaboratively distribute the output torque of the engine and drive motor with the goal of optimizing the overall energy consumption of the vehicle.

[0072] In one optional implementation, if the current working mode is the normal working mode, one or more of the following are verified: the engine status, whether a preset level of engine fault is received, whether the catalytic converter temperature is greater than or equal to a second set temperature threshold, and whether the OBD diagnostic request is received.

[0073] Within the normal operating mode, if the engine state switches from the running state to the stopped state, it indicates that the seventh jump condition 7 is met, and the normal operating mode is switched back to the initial mode.

[0074] Within the initial mode, the corresponding cooperative control logic is invoked to perform the following operation: control the clutch to disengage.

[0075] If the OBD diagnostic request is received within the normal working mode, it indicates that the fourth jump condition 4 is met, and the normal working mode is switched to the OBD diagnostic mode.

[0076] Within the OBD diagnostic mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to disengage, start the starter motor, control the engine with the engine output torque being less than the OBD torque threshold and the engine torque change difference being less than the OBD torque difference threshold as constraints, and perform on-board diagnostic testing on the three-way catalytic converter and oxygen sensor outside the engine and store the diagnostic results.

[0077] In this implementation, by configuring the OBD diagnostic mode and keeping the clutch in an open state, the engine is decoupled from the vehicle's driving load, completely isolating load disturbances caused by vehicle speed and driver operation. Dual control is implemented for engine torque, limiting the engine output torque to less than the OBD torque threshold, while also constraining the difference in engine torque variation during operation to less than the OBD torque difference threshold, forming a continuously stable detection environment. This avoids misdiagnosis of the oxygen sensor and three-way catalytic converter due to fluctuations in operating conditions, ensuring the accuracy and reliability of diagnostic results. After the diagnostic process is completed, the system can automatically switch to the standard control mode without affecting the vehicle's normal driving control.

[0078] In the normal working mode, if a preset level of engine fault is received or the catalyst temperature is greater than or equal to the second set temperature threshold, it indicates that the fifth jump condition 5 is met, and the normal working mode is switched to the torque limiting protection mode. Within the torque limiting protection mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to close, control the engine to operate within the set torque limiting threshold (i.e., perform torque limiting operation), and control the drive motor to output torque according to the torque difference corresponding to the engine torque limiting value.

[0079] In this embodiment of the invention, unlike the existing solution where torque limiting is performed unilaterally by the engine controller: the engine relies on throttle, intake and exhaust regulation, and ignition angle correction to reduce torque, which has a natural dynamic lag. Limiting torque alone will cause a sudden drop in wheel torque. The torque limiting protection mode limits engine output while the vehicle controller synchronously coordinates the drive motor to compensate for the missing torque, offsets the power drop caused by engine adjustment lag, avoids drastic fluctuations in wheel torque, effectively eliminates driving jerks, and significantly improves the smoothness of the vehicle's driving.

[0080] If the current working mode is OBD diagnostic mode, verify whether an OBD diagnostic request has been received.

[0081] If the OBD diagnostic request is not received, it means that the eighth jump condition 8 is met, and the OBD diagnostic mode is switched to the normal working mode.

[0082] Within the normal operating mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to close, prohibit torque limiting of the engine, and collaboratively distribute the output torque of the engine and drive motor with the goal of optimizing the overall energy consumption of the vehicle.

[0083] If the current operating mode is the torque limiting protection mode, check whether a preset level of engine fault is received and whether the catalytic converter temperature is less than the second set temperature threshold.

[0084] If the engine remains in operation and the set power threshold is not invoked to limit the engine, and the catalyst temperature is less than the second set temperature threshold, it indicates that the ninth jump condition 9 is met, and the torque limiting protection mode is switched to the normal operation mode.

[0085] Within the normal operating mode, the corresponding collaborative control logic is invoked to perform the following operations: control the clutch to close, prohibit torque limiting of the engine, and collaboratively distribute the output torque of the engine and drive motor with the goal of optimizing the overall energy consumption of the vehicle.

[0086] The above describes the implementation logic of the hybrid vehicle control method of the present invention.

[0087] In the technical solution of this invention, multiple control objectives can be systematically coordinated. Unlike traditional hybrid control schemes that only divide the working modes around fuel economy and vehicle torque requirements, this solution comprehensively considers all requirements such as engine start-up, emission compliance, energy consumption balance, and operational reliability. It sets up six working modes: initial, warm-up, idle, standard, OBD diagnostics, and torque limiting protection. Based on the jump logic of each mode, it simultaneously optimizes vehicle power, economy, emission indicators, diagnostic compliance, and ride smoothness, and solves various working condition defects caused by prioritizing fuel consumption reduction and energy distribution.

[0088] For example, existing technologies lack an independent temperature control process during the cold start phase. In pursuit of low fuel consumption, the system frequently starts and stops the engine, which can easily lead to slow catalytic converter heating, low efficiency in exhaust pollutant conversion, and deteriorated emissions performance. In this technical solution, a separate engine heating mode is set up, with mode switching determined by engine power-on. Priority is given to controlling the engine's continuous and stable operation to rapidly raise the catalytic converter temperature, placing emissions compliance requirements before energy consumption targets and avoiding cold start emissions exceeding standards at the source.

[0089] For example, when existing technologies detect secondary faults or catalytic converter overheating requiring torque limiting, they rely solely on the engine to reduce output torque without coordinating with the drive motor to compensate for the torque. This sudden change in power output results in noticeable jerking and a poor driving smoothness. In this technical solution, a torque limiting protection mode is configured. After the engine torque limiting is triggered, the vehicle controller synchronously coordinates with the drive motor to compensate for the torque, smoothly making up for the engine power shortfall, eliminating power switching shocks, and balancing equipment protection and driving experience.

[0090] For example, existing OBD diagnostic techniques lack dedicated steady-state isolation of the driving load. Continuous fluctuations in the driving load interfere with sensor sampling, causing diagnostic signal distortion and insufficient detection accuracy, making it difficult to meet the stringent regulatory requirements for on-board diagnostics. This technical solution establishes an OBD diagnostic mode, which, upon triggering, stably controls the engine to isolate the external driving load, ensuring a stable sensor sampling environment, improving diagnostic data accuracy, and meeting emission regulation compliance requirements.

[0091] Furthermore, this solution proposes a state-classification strategy centered on engine lifecycle management, breaking away from the traditional approach of dividing operating conditions in hybrid systems based on energy distribution dimensions such as pure electric and hybrid modes. It sets up multiple operating modes around the underlying constraints of engine operation, including emission temperature, emission requirements, OBD diagnostic requirements, and fault levels, thus shifting the control logic from "vehicle energy management as the core" to "engine lifecycle management as the core." Simultaneously, each mode is configured with its own dedicated transition conditions and a complete flow path for mode switching, establishing a complete closed-loop control logic framework for the engine to ensure precise and orderly mode switching.

[0092] Secondly, based on the same inventive concept as the hybrid vehicle control method provided in the first aspect of the embodiments described above, the present invention also provides a hybrid vehicle control system, see below. Figure 4 The system includes: The acquisition module 401 is used to acquire relevant engine operating parameters in real time within the current operating mode; wherein, the current operating mode is one of N operating modes divided according to the engine operating conditions, where N≥6 and is a positive integer; each operating mode is configured with its own cooperative control strategy and jump condition set; Verification module 402 is used to call the current jump condition set corresponding to the current working mode to verify the relevant operating parameters of the engine; The switching module 403 is used to switch the current working mode to the target working mode corresponding to the jump condition if the engine-related operating parameters meet any jump condition in the current jump condition set, and to manage the engine according to the cooperative control strategy in the target working mode.

[0093] It should be noted that the specific way in which each module performs operations in the control system of the hybrid vehicle provided in the embodiments of the present invention has been described in detail in the method embodiments provided in the first aspect above. The specific implementation process can be referred to the method embodiments provided in the first aspect above, and will not be described in detail here.

[0094] Thirdly, based on the same inventive concept as the control method for hybrid vehicles provided in the first aspect of the embodiments described above, the present invention also discloses a hybrid vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[0095] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0096] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A control method for a hybrid vehicle, characterized in that, The method includes: Within the current operating mode, relevant engine operating parameters are collected in real time; wherein, the current operating mode is one of N operating modes divided according to engine operating conditions, where N≥6 and is a positive integer; each operating mode is configured with its own cooperative control strategy and jump condition set; The engine-related operating parameters are verified by calling the current jump condition set corresponding to the current working mode; If the engine's relevant operating parameters meet any of the jump conditions in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode.

2. The method as described in claim 1, characterized in that, The engine-related operating parameters include one or more of the following: engine status, catalyst temperature, engine fault level, on-board diagnostic (OBD) request, idle emission request, and vehicle power supply status. The N operating modes include: initial mode, warm-up mode, idle mode, OBD diagnostic mode, torque limiting protection mode, and normal operating mode.

3. The method as described in claim 2, characterized in that, If the current operating mode is the initial mode, and if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the initial mode, if the vehicle power supply status is powered on and the engine status changes from stopped to running, the initial mode is switched to the heating mode. In the heating mode, the clutch is disengaged, the starter motor is turned on, and the engine is controlled to operate at a preset fixed torque and a preset fixed speed.

4. The method as described in claim 2, characterized in that, If the current operating mode is the heating mode, and if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the warming mode, if the idle speed discharge request is received, the warming mode is switched to the idle speed mode; in the idle speed mode, the clutch is disengaged and the engine is controlled to run at the target idle speed. In the heating mode, if no idle emission request is received and the catalyst temperature reaches the first set temperature threshold, the heating mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, and the engine torque is prohibited from being limited. The output torque of the engine and the drive motor is coordinated and distributed with the goal of optimizing the overall energy consumption of the vehicle.

5. The method as described in claim 2, characterized in that, If the current operating mode is the idling mode, and if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the idle mode, if the idle emission request is not received or the idle emission request reception times out, the idle mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, the engine torque is restricted, and the output torque of the engine and drive motor is coordinated to optimize the overall energy consumption of the vehicle.

6. The method as described in claim 2, characterized in that, If the current operating mode is the normal operating mode, and if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: Within the normal operating mode, if the engine state changes from running to stopped, the normal operating mode is switched back to the initial mode; within the initial mode, the clutch is disengaged. In the normal working mode, if the OBD diagnostic request is received, the normal working mode is switched to the OBD diagnostic mode; in the OBD diagnostic mode, the clutch is disengaged, the starter motor is turned on, and the engine is controlled with the constraints that the engine output torque is less than the OBD torque threshold and the engine torque change difference is less than the OBD torque difference threshold. On-board diagnostic tests are performed on the three-way catalytic converter and oxygen sensor outside the engine and the diagnostic results are stored. In the normal operating mode, if a preset level of engine fault is received or the catalytic converter temperature is greater than or equal to a second set temperature threshold, the normal operating mode is switched to the torque limiting protection mode. In the torque limiting protection mode, the clutch is controlled to close, the engine is controlled to run within the set torque limiting threshold, and the drive motor is controlled to output torque according to the torque difference corresponding to the engine torque limiting value.

7. The method as described in claim 2, characterized in that, If the current operating mode is the OBD diagnostic mode, and if the engine-related operating parameters meet any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: If no OBD diagnostic request is received in the OBD diagnostic mode, the OBD diagnostic mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, the engine torque is restricted, and the output torque of the engine and drive motor is coordinated to optimize the overall energy consumption of the vehicle.

8. The method as described in claim 2, characterized in that, If the current operating mode is the torque limiting protection mode, and if the engine-related operating parameters satisfy any jump condition in the current jump condition set, the current operating mode is switched to the target operating mode corresponding to the jump condition, and the engine is managed according to the cooperative control strategy in the target operating mode, specifically including: In the torque limiting protection mode, if no preset engine fault level is received and the catalyst temperature is less than the second set temperature threshold, the torque limiting protection mode is switched to the normal operating mode. In the normal operating mode, the clutch is controlled to close, and the torque limiting of the engine is prohibited. The output torque of the engine and the drive motor is coordinated to optimize the overall energy consumption of the vehicle.

9. A control system for a hybrid vehicle, characterized in that, The system includes: The acquisition module is used to acquire relevant engine operating parameters in real time within the current operating mode; wherein, the current operating mode is one of N operating modes divided according to the engine operating conditions, where N≥6 and is a positive integer; each operating mode is configured with its own cooperative control strategy and jump condition set; The verification module is used to call the current jump condition set corresponding to the current working mode to verify the relevant operating parameters of the engine; The switching module is used to switch the current working mode to the target working mode corresponding to the jump condition if the engine-related operating parameters meet any jump condition in the current jump condition set, and to manage the engine according to the cooperative control strategy in the target working mode.

10. A hybrid vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method according to any one of claims 1-8.

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