Hybrid systems, control methods, and hybrid vehicles

Abstract

This application discloses a hybrid power system, control method, and hybrid vehicle, belonging to the field of automotive electronics technology. The system includes an engine, an electric motor, a transmission, wheels, a transmission protection module, and a controller. The engine and transmission input shafts are connected, as are the electric motor and transmission input shafts. The transmission output shaft is connected to the wheel axles via a differential. The transmission protection module sends a power limiting signal to the controller when the transmission is in a first operating state. In the first operating state, the power system parameters corresponding to the hybrid power system are greater than a first parameter threshold, and the duration reaches a first duration. The controller controls the output power of the engine and electric motor based on the power limiting signal. The solution provided in this application can effectively protect the transmission and prevent damage under heavy load conditions.

Description

Technical Field

[0001] This application relates to the field of automotive electronics technology, and in particular to a hybrid power system, control method, and hybrid vehicle. Background Technology

[0002] A dedicated hybrid transmission (DHT) is a highly integrated hybrid powertrain that combines an engine, an electric motor, and a multi-speed transmission.

[0003] In related technologies, during the control process of hybrid vehicles, under heavy load conditions, the maximum output torque and speed of the electric motor and engine may exceed the maximum limit that the transmission can withstand, thereby causing damage to the transmission. Summary of the Invention

[0004] This application provides a hybrid power system, a control method, and a hybrid vehicle, the technical solutions of which are as follows.

[0005] On one hand, embodiments of this application provide a hybrid power system, the system including an engine, an electric motor, a transmission, wheels, a transmission protection module, and a controller;

[0006] The engine is connected to the input shaft of the gearbox, the electric motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the wheel axle of the wheel via a differential.

[0007] The transmission protection module is used to send a power limiting signal to the controller when the transmission is in a first operating state; in the first operating state, the power system parameters corresponding to the hybrid power system are greater than a first parameter threshold and the duration reaches a first duration.

[0008] The controller is used to control the output power of the engine and the electric motor based on the power limiting signal.

[0009] On the other hand, embodiments of this application provide a control method for a hybrid power system, the system including an engine, an electric motor, a transmission, wheels, a transmission protection module, and a controller;

[0010] The engine is connected to the input shaft of the gearbox, the electric motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the wheel axle of the wheel via a differential.

[0011] The method includes:

[0012] When the transmission is in the first operating state, the transmission protection module sends a power limiting signal to the controller; in the first operating state, the power system parameters corresponding to the hybrid power system are greater than the first parameter threshold and the duration reaches the first duration.

[0013] Based on the power limiting signal, the controller controls the output power of the engine and the electric motor.

[0014] On the other hand, embodiments of this application provide a hybrid vehicle that includes a hybrid power system as described above.

[0015] In this embodiment, a transmission protection module is set to detect the working state of the transmission. When the transmission is in a first working state, that is, when the power system parameters corresponding to the hybrid system are greater than the first parameter threshold and the duration reaches the first duration, the transmission protection module sends a power limiting signal to the controller. The controller controls the output power of the engine and the electric motor according to the power limiting signal, thereby effectively limiting the output power of the engine and the electric motor and avoiding transmission damage under heavy load conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a hybrid power system provided in an exemplary embodiment of this application is shown;

[0018] Figure 2 This invention provides a structural block diagram of a transmission protection module according to an exemplary embodiment of the present application.

[0019] Figure 3 This application illustrates a flowchart of a method for determining the operating state of a transmission according to an exemplary embodiment.

[0020] Figure 4 A flowchart illustrating the adjustment of the output power of the engine and the electric motor provided in an exemplary embodiment of this application is shown;

[0021] Figure 5 A flowchart of a control method provided in an exemplary embodiment of this application is shown. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0025] It should be understood that although the terms first, second, etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, a first parameter may also be referred to as a second parameter, and similarly, a second parameter may also be referred to as a first parameter. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0026] First, a brief introduction to the terms used in the embodiments of this application:

[0027] Transmission: The full name is automotive transmission, a key component of a vehicle's powertrain, located between the engine and the drive wheels. The transmission adjusts the torque and speed output of the engine or electric motor by changing gear engagement according to driving conditions and needs, adapting to different driving situations such as starting, accelerating, climbing hills, or high-speed cruising. Furthermore, by properly adjusting the engine or electric motor to operate within its optimal speed range, the transmission helps improve fuel efficiency, thereby saving energy.

[0028] An engine is a machine that converts the heat energy generated by burning fuel into mechanical energy. It plays a central role in various vehicles and mechanical equipment, such as automobiles, motorcycles, ships, airplanes, and generators. The main function of an engine is to provide power and drive the movement of vehicles or machines.

[0029] Engine Control Unit (ECU): Responsible for controlling and managing all critical functions of the engine to ensure efficient, clean, and safe operation under various conditions. The ECU monitors the engine's operating status by receiving signals from various sensors and then adjusts key parameters such as fuel injection, ignition timing, idle speed, and emission control based on this information.

[0030] Electric motor: As an important component of a vehicle's powertrain, it works in conjunction with an internal combustion engine (usually a gasoline or diesel engine) to provide power to the vehicle. In situations requiring additional power, such as acceleration or hill climbing, the electric motor can assist the internal combustion engine in providing more torque and power, thereby improving vehicle performance. In some hybrid systems, the electric motor can independently drive the vehicle for short distances in pure electric mode, typically at low speeds or when stationary, to reduce fuel consumption and emissions.

[0031] The Motor Controller Unit (MCU) is responsible for controlling the operating status of the electric motor, including starting, stopping, and adjusting its speed and torque. By receiving commands from the Vehicle Control Unit (VCU) and status information from the motor and battery, the MCU precisely controls the motor's power electronics, such as the inverter, to adjust the motor's current and voltage, thereby achieving precise control of the motor.

[0032] Hybrid systems are systems that use two or more energy sources simultaneously to power a vehicle. In the automotive industry, the most common hybrid systems combine an internal combustion engine (usually a gasoline or diesel engine) and an electric motor. These systems are designed to improve fuel efficiency, reduce emissions, and provide better driving performance.

[0033] Please refer to Figure 1 The diagram illustrates a schematic representation of a hybrid power system provided in an exemplary embodiment of this application. The system includes an engine 101, an electric motor 102, a gearbox, wheels 111, a gearbox protection module, and a controller.

[0034] Indicative, such as Figure 1 As shown, engine 101 is connected to the input shaft 105 of the gearbox, electric motor 102 is connected to the input shaft 105 of the gearbox, and the output shaft 107 of the gearbox is connected to the wheel axle 110 of wheel 111 through differential 109.

[0035] Optionally, the input shaft 105 and output shaft 107 of the transmission are connected via an input shaft drive gear 104 and an output shaft driven gear 108. Optionally, the output shaft 107 of the transmission is connected to the differential 109 via an output shaft gear set 106.

[0036] Optionally, a clutch 103 is designed on the input shaft 105 of the gearbox, on the side closer to the engine 101.

[0037] The transmission protection module is used to send a power limiting signal to the controller when the transmission is in the first operating state; in the first operating state, the power system parameters corresponding to the hybrid system are greater than the first parameter threshold and the duration reaches the first duration.

[0038] Optionally, during the operation of a hybrid vehicle, the powertrain parameters in the hybrid system can typically be detected in real time using vehicle sensors.

[0039] Optionally, a hybrid system refers to a system that uses two or more energy sources to provide power in a vehicle. The hybrid energy sources are usually an engine and an electric motor.

[0040] Optionally, the powertrain parameters include at least engine parameters and electric motor parameters. Engine parameters may include engine power, torque, speed, and displacement; electric motor parameters may include power, torque, and speed.

[0041] Optionally, the first parameter threshold may include maximum power, maximum torque, maximum speed, etc. Optionally, the first parameter threshold can be determined based on the actual design and testing conditions of the hybrid system.

[0042] Optionally, in the first operating state, the power system parameters are greater than a first parameter threshold, and the duration reaches a first duration. That is, the first operating state refers to a high-load operating state. For example, the power system parameters are greater than the first parameter threshold for a duration of 1 minute.

[0043] In some embodiments, the transmission protection module obtains the power system parameters corresponding to the hybrid system from the vehicle sensors in real time, and compares the power system parameters with a first parameter threshold. If the power system parameters are greater than the first parameter threshold and the duration reaches a first duration, the transmission protection module can confirm that the transmission is in a first working state, and then send a power limiting signal to the controller.

[0044] Optionally, the power limiting signal may include the parameter type of the power system parameter, the parameter exceeding value of the power system parameter, the current power system parameter, etc., which are not limited in this embodiment.

[0045] The controller is used to control the output power of the engine and electric motor based on the power limit signal.

[0046] In some embodiments, upon receiving a power limiting signal from the transmission protection module, the controller needs to immediately control the output power of the engine and electric motor according to the power limiting signal, thereby changing the operating state of the transmission.

[0047] Optionally, the controller in the hybrid system is divided into an engine controller and an electric motor controller, with the engine corresponding to the engine controller and the electric motor corresponding to the electric motor controller. In one possible implementation, the transmission protection module can send power limiting signals to both the engine controller and the electric motor controller.

[0048] Optionally, the engine's output power refers to its output torque and output speed. Alternatively, the electric motor's output power refers to its output torque and output speed.

[0049] In one possible implementation, while the controller is reducing the output power of the engine and electric motor, the transmission protection module still needs to continuously acquire powertrain parameters in real time and determine the transmission's operating status based on these parameters. When the transmission is not in its primary operating state, the controller does not need to control the engine and electric motor output power based on the power limiting signal; it only needs to respond normally to the driver's pedal signals, steering angle signals, and shift signals, etc.

[0050] In summary, in this embodiment of the application, by setting a transmission protection module to detect the working state of the transmission, and when the transmission is in the first working state, that is, when the power system parameters corresponding to the hybrid power system are greater than the first parameter threshold and the duration reaches the first duration, the transmission protection module sends a power limiting signal to the controller. The controller controls the output power of the engine and the electric motor according to the power limiting signal, thereby effectively limiting the output power of the engine and the electric motor and avoiding transmission damage under high load conditions.

[0051] Please refer to Figure 2 This illustrates a structural block diagram of a transmission protection module provided in an exemplary embodiment of this application. Figure 2 As shown, the transmission protection module 200 includes a signal detection unit 201, a working condition identification unit 202, and a power limiting unit 203.

[0052] The signal detection unit 201 is used to acquire the power system parameters corresponding to the hybrid power system and send the power system parameters to the operating condition identification unit 202.

[0053] In some embodiments, during the operation of a hybrid vehicle, the signal detection unit in the transmission protection module is responsible for detecting the powertrain parameters in the hybrid system in real time through vehicle sensors.

[0054] Optionally, powertrain parameters may include at least one of engine speed, torque, and vehicle speed.

[0055] In one possible implementation, the signal detection unit can be used to acquire a first rotational speed and a first torque on the input shaft of the gearbox.

[0056] Optionally, the first rotational speed can be measured by a speed sensor mounted on the gearbox input shaft, and the first torque can be measured by a torque sensor mounted on the gearbox input shaft.

[0057] In one possible implementation, the signal detection unit can also be used to acquire a second rotational speed and a second torque on the output shaft of the gearbox.

[0058] Optionally, the second speed can be measured by a speed sensor mounted on the gearbox output shaft, and the second torque can be measured by a torque sensor mounted on the gearbox output shaft.

[0059] In one possible implementation, the signal detection unit can also be used to acquire a third torque on the wheel axle and the vehicle speed.

[0060] Optionally, the third torque can be measured by a torque sensor mounted on the wheel axle, and the vehicle speed can be measured by a speed sensor mounted on the wheel axle.

[0061] In some embodiments, considering the possibility of sensor failure during signal measurement, the signal detection unit can also perform mutual calculation and verification of the first speed, second speed, first torque, second torque, and third torque based on the torque conversion relationship and speed conversion relationship between the input shaft, output shaft, and wheel shaft, so as to avoid signal acquisition errors.

[0062] In one possible implementation, after obtaining the first rotational speed and first torque on the input shaft of the transmission, the second rotational speed and second torque on the output shaft, the third torque on the wheel axle and the vehicle speed, the signal detection unit can send the various parameter values ​​to the operating condition identification unit.

[0063] The operating condition identification unit 202 is used to determine the operating state of the transmission based on the power system parameters.

[0064] In some embodiments, after obtaining the first rotational speed and first torque on the input shaft of the transmission, the second rotational speed and second torque on the output shaft, the third torque on the wheel axle and the vehicle speed, the operating condition identification unit can determine the operating state of the transmission based on the various parameter values.

[0065] Optionally, the situations where the powertrain parameters exceed the first parameter threshold include at least one of the following: 1) A first rotational speed on the input shaft of the transmission exceeds the first rotational speed threshold. For example, the first rotational speed on the input shaft of the transmission exceeds 4000 rpm / min; 2) A second rotational speed on the output shaft of the transmission exceeds the second rotational speed threshold. For example, the second rotational speed on the output shaft of the transmission exceeds 4000 rpm / min; 3) A first torque on the input shaft of the transmission exceeds the first torque threshold. For example, the first torque on the input shaft of the transmission exceeds 360 N; 4) A second torque on the output shaft of the transmission exceeds the second torque threshold. For example, the second torque on the output shaft of the transmission exceeds 360 N; 5) A third torque on the wheel axle exceeds the third torque threshold. For example, the third torque on the wheel axle exceeds 4000 N; 6) The vehicle speed on the wheel axle exceeds the vehicle speed threshold. For example, the vehicle speed on the wheel axle exceeds 180 km / h.

[0066] It should be noted that the threshold values ​​of each of the above parameters need to be determined based on the actual design and testing of the hybrid power system. This embodiment only uses specific values ​​as examples.

[0067] In one possible implementation, the operating condition identification unit determines the operating state of the transmission based on the power system parameters and sends the operating state determination result to the power limiting unit.

[0068] Please refer to Figure 3 The diagram illustrates a flowchart for determining the operating state of a transmission according to an exemplary embodiment of this application.

[0069] like Figure 3As shown, the operating condition identification unit first acquires the rotational speed, torque, and vehicle speed on each shaft of the transmission. Specifically, this includes the first rotational speed and first torque on the input shaft, the second rotational speed and second torque on the output shaft, and the third torque and vehicle speed on the wheel axles. It then compares the first rotational speed with a first rotational speed threshold, the second rotational speed with a second rotational speed threshold, the first torque with a first torque threshold, the second torque with a second torque threshold, the third torque with a third torque threshold, and the vehicle speed with a vehicle speed threshold. If any parameter value exceeds a threshold, the operating condition identification unit continues to monitor the duration of this excess value. By determining whether the duration reaches a first specified duration, it identifies whether the transmission is operating under heavy load. For example, if a parameter value exceeds a threshold and the duration reaches 60 seconds, the operating condition identification unit can determine that the transmission is operating under heavy load (the first operating state).

[0070] The operating condition identification unit 202 is used to determine that the transmission is in a second operating state when the power system parameters are less than the second parameter threshold and the duration reaches the second duration; wherein the second parameter threshold is less than the first parameter threshold.

[0071] In some embodiments, when the power system parameters are less than the second parameter threshold and the duration reaches the second duration, the operating condition identification unit can determine that the transmission is in the second operating state, that is, the transmission is in a normal operating state within the safe range.

[0072] Optionally, the second parameter threshold is less than the first parameter threshold. The second parameter threshold can be equal to 0.9 * the first parameter threshold. Optionally, the second duration can be equal to or greater than the first duration.

[0073] The power limiting unit 203 is used to send a power limiting signal to the controller when the transmission is in the first operating state.

[0074] In some embodiments, when the transmission is in a first operating state, the power limiting unit can send a power limiting signal to the controller until the power system parameters are less than the second parameter threshold and the duration reaches the second duration.

[0075] Optionally, the power limiting signal may include the parameter type of the power system parameter, the parameter exceeding value of the power system parameter, the current power system parameter, etc., which are not limited in this embodiment.

[0076] In one possible implementation, when the transmission is in a first operating state, the power limiting unit sends a first power limiting signal to the engine controller and a second power limiting signal to the electric motor controller, thereby the engine controller responds to the first power limiting signal and reduces the output power of the engine; and the electric motor controller responds to the second power limiting signal and reduces the output power of the electric motor.

[0077] In some embodiments, in order to improve the rationality of control over the engine and the electric motor, when the transmission is in the first working state, the power limiting unit can first determine the parameter excess value of the power system parameters, and then determine the first power limiting value corresponding to the engine and the second power limiting value corresponding to the electric motor based on the parameter excess value and the limit value allocation condition.

[0078] For example, if the first speed of the gearbox input shaft exceeds the first speed threshold by 20N, that is, the parameter exceeds 20N, then the first power limit value and the second power limit value can be 10N respectively; or the first power limit value can be 5N, the second power limit value can be 15N, and so on.

[0079] Optionally, the limit value allocation conditions include at least one of the operating modes of the engine and the electric motor, and the remaining power of the electric motor.

[0080] Optionally, the operating modes of the engine and electric motor can be pure electric mode, engine drive mode, hybrid drive mode, auxiliary drive mode, etc. The allocation method of power limit value is different in different operating modes, and the specific allocation method can be determined according to the actual design and testing conditions.

[0081] For example, in pure electric mode, the first power limit value is 0, and the second power limit value is the parameter exceeding the limit. As another example, in hybrid drive mode, the first power limit value can be equal to 30% of the parameter exceeding the limit, and the second power limit value can be equal to 70% of the parameter exceeding the limit.

[0082] Optionally, the remaining power of the motor can be inversely proportional to the proportion of the second power limit value; the less the remaining power of the motor, the greater the proportion of the second power limit value to the parameter excess value.

[0083] For example, when the motor has 30% remaining charge, the second power limit can be equal to 60% of the parameter exceeding the limit. As another example, when the motor has 20% remaining charge, the second power limit can be equal to 75% of the parameter exceeding the limit.

[0084] In one possible implementation, when the transmission is in the first operating state, the engine is in an output limiting state. In order to effectively reduce the engine output power while ensuring driving safety, the engine controller can also be used to receive the pedal input signal and respond to the pedal input signal when the pedal input signal indicates that the pedal depth is greater than a depth threshold.

[0085] Optionally, the pedal input signals include accelerator pedal input signals and brake pedal input signals. Optionally, the pedal depth indicated by the pedal input signals can be measured by a displacement sensor mounted on the pedal.

[0086] In one possible example, the transmission is in its first operating state, the engine's output power is limited, and it is temporarily unable to respond to the pedal input signal. At this time, if an emergency braking is required due to danger, the driver may press the brake pedal to the bottom, that is, the pressing depth is greater than the depth threshold. Therefore, in order to ensure driving safety, the engine controller needs to respond to the pedal input signal.

[0087] In another possible implementation, if a brake pedal input signal is received during the process of limiting the engine's output power, and the brake pedal input signal can quickly reduce the engine's output power, then the engine controller can also respond to the brake pedal input signal.

[0088] The power limiting unit 203 is used to release the power output limitation on the engine and electric motor when the transmission is in the second operating state.

[0089] In some embodiments, after sending a power limiting signal to the controller, the transmission protection module still performs signal detection and operating condition identification in real time, so that when the transmission is in the second operating state, the power limiting unit can release the power output limitation on the engine and electric motor.

[0090] Optionally, after the output power limit is lifted, the engine and electric motor can respond normally to the driver's pedal signals, steering angle signals, and gear shift signals, etc.

[0091] Please refer to Figure 4 It illustrates a flowchart of adjusting the output power of the engine and the electric motor provided in an exemplary embodiment of this application.

[0092] like Figure 4As shown, the operating condition identification unit determines whether the transmission is operating under high torque load and high speed. When the transmission is in the second operating state, it indicates that the transmission is safe and there is no risk of damage. In this case, the signal detection unit only needs to continuously monitor the speed, torque, and vehicle speed on each shaft of the transmission. When the transmission is in the first operating state, the power limiting unit needs to send a first power limiting value to the engine controller and a second power limiting value to the electric motor, thereby adjusting the output torque and speed of the engine and electric motor to return the transmission to the second operating state.

[0093] In the above embodiments, the power system parameters are first obtained by the signal detection unit, the working condition identification unit determines the working state of the transmission, and then the power limiting unit sends a power limiting signal to the controller. This can improve the accuracy of working condition identification and power limiting, effectively control the output power of the engine and electric motor, and thus avoid damage to the transmission.

[0094] Please refer to Figure 5 The diagram illustrates a flowchart of a control method provided in an exemplary embodiment of this application. The method is used in a hybrid power system, which includes an engine, an electric motor, a transmission, wheels, a transmission protection module, and a controller.

[0095] The engine is connected to the input shaft of the gearbox, the electric motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the wheel axle through the differential.

[0096] Step 501: When the transmission is in the first working state, a power limiting signal is sent to the controller through the transmission protection module; in the first working state, the power system parameters corresponding to the hybrid system are greater than the first parameter threshold and the duration reaches the first duration.

[0097] Optionally, during the operation of a hybrid vehicle, the powertrain parameters in the hybrid system can typically be detected in real time using vehicle sensors.

[0098] Optionally, a hybrid system refers to a system that uses two or more energy sources to provide power in a vehicle. The hybrid energy sources are usually an engine and an electric motor.

[0099] Optionally, the powertrain parameters include at least engine parameters and electric motor parameters. Engine parameters may include engine power, torque, speed, and displacement; electric motor parameters may include power, torque, and speed.

[0100] Optionally, the first parameter threshold may include maximum power, maximum torque, maximum speed, etc. Optionally, the first parameter threshold can be determined based on the actual design and testing conditions of the hybrid system.

[0101] Optionally, in the first operating state, the power system parameters are greater than a first parameter threshold, and the duration reaches a first duration. That is, the first operating state refers to a high-load operating state. For example, the power system parameters are greater than the first parameter threshold for a duration of 1 minute.

[0102] In some embodiments, the hybrid system obtains the corresponding power system parameters from the vehicle sensors in real time through the transmission protection module, and compares the power system parameters with a first parameter threshold. If the power system parameters are greater than the first parameter threshold and the duration reaches a first duration, the transmission protection module can confirm that the transmission is in a first working state and then send a power limiting signal to the controller.

[0103] Optionally, the power limiting signal may include the parameter type of the power system parameter, the parameter exceeding value of the power system parameter, the current power system parameter, etc., which are not limited in this embodiment.

[0104] The transmission protection module includes a signal detection unit, an operating condition identification unit, and a power limiting unit. In one possible implementation, the hybrid system can first obtain the corresponding power system parameters through the signal detection unit and send the power system parameters to the operating condition identification unit. Then, based on the power system parameters, the operating condition identification unit determines the operating state of the transmission. Subsequently, when the transmission is in its first operating state, the power limiting unit sends a power limiting signal to the controller.

[0105] Step 502: Based on the power limit signal, control the output power of the engine and the electric motor through the controller.

[0106] In some embodiments, upon receiving a power limiting signal from the transmission protection module, the hybrid system controls the output power of the engine and electric motor according to the power limiting signal through the controller, thereby changing the operating state of the transmission.

[0107] Optionally, the engine corresponds to an engine controller, and the electric motor corresponds to an electric motor controller. In one possible implementation, the transmission protection module can send power limiting signals to both the engine controller and the electric motor controller.

[0108] Optionally, the engine's output power refers to its output torque and output speed. Alternatively, the electric motor's output power refers to its output torque and output speed.

[0109] In one possible implementation, while the controller is reducing the output power of the engine and electric motor, the hybrid system can continue to acquire powertrain parameters in real time through the transmission protection module and determine the transmission's operating status based on these parameters. When the transmission is not in its primary operating state, the controller does not need to control the output power of the engine and electric motor based on the power limiting signal; it only needs to respond normally to the driver's pedal signals, steering angle signals, and shift signals, etc.

[0110] In summary, in this embodiment of the application, by setting a transmission protection module to detect the working state of the transmission, and when the transmission is in the first working state, that is, when the power system parameters corresponding to the hybrid power system are greater than the first parameter threshold and the duration reaches the first duration, the transmission protection module sends a power limiting signal to the controller. The controller controls the output power of the engine and the electric motor according to the power limiting signal, thereby effectively limiting the output power of the engine and the electric motor and avoiding transmission damage under high load conditions.

[0111] The solutions shown in the above embodiments of this application can be applied to hybrid vehicles. Specifically, this application also provides a hybrid vehicle that includes the hybrid system shown in the various embodiments described above.

[0112] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0113] The above are merely optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hybrid power system, characterized in that, The system includes an engine, an electric motor, a gearbox, wheels, a gearbox protection module, and a controller; The engine is connected to the input shaft of the gearbox, the electric motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the wheel axle of the wheel via a differential. The transmission protection module is used to send a power limiting signal to the controller when the transmission is in a first operating state; in the first operating state, the power system parameters corresponding to the hybrid power system are greater than a first parameter threshold and the duration reaches a first duration. The controller is used to control the output power of the engine and the electric motor based on the power limiting signal.

2. The hybrid power system according to claim 1, characterized in that, The transmission protection module includes a signal detection unit, a working condition identification unit, and a power limiting unit; The signal detection unit is used to acquire the power system parameters corresponding to the hybrid power system and send the power system parameters to the operating condition identification unit. The operating condition identification unit is used to determine the operating state of the transmission based on the power system parameters. The power limiting unit is used to send the power limiting signal to the controller when the transmission is in the first operating state.

3. The hybrid power system according to claim 2, characterized in that, The powertrain parameters include at least one of engine speed, torque, and vehicle speed; The signal detection unit is used for: Obtain the first rotational speed and the first torque on the input shaft of the gearbox; Obtain the second rotational speed and the second torque on the output shaft of the gearbox; Obtain the third torque on the wheel axle and the vehicle speed.

4. The hybrid power system according to claim 3, characterized in that, The situation where the power system parameter is greater than the first parameter threshold includes at least one of the following: The first rotational speed on the input shaft of the transmission is greater than a first rotational speed threshold. The second rotational speed on the output shaft of the transmission is greater than a second rotational speed threshold. The first torque on the input shaft of the transmission is greater than a first torque threshold. The second torque on the output shaft of the transmission is greater than a second torque threshold. The third torque on the wheel axle is greater than the third torque threshold. The vehicle speed on the wheel axle is greater than the vehicle speed threshold.

5. The hybrid power system according to claim 2, characterized in that, The controller includes an engine controller and an electric motor controller; The power limiting unit is used to send a first power limiting signal to the engine controller and a second power limiting signal to the electric motor controller when the transmission is in the first operating state. The engine controller is used to reduce the output power of the engine in response to the first power limiting signal; The motor controller is used to reduce the output power of the motor in response to the second power limiting signal.

6. The hybrid power system according to claim 5, characterized in that, The power limiting unit is also used for: When the transmission is in the first operating state, it is determined that the parameters of the power system exceed the specified values. Based on the parameter exceedance value and the limit value allocation condition, a first power limit value corresponding to the engine and a second power limit value corresponding to the electric motor are determined. The limit value allocation condition includes at least one of the operating modes of the engine and the electric motor, and the remaining power of the electric motor.

7. The hybrid power system according to claim 5, characterized in that, When the gearbox is in the first operating state The engine controller is used to receive pedal input signals; The engine controller is also configured to respond to the pedal input signal when the pedal input signal indicates that the pedal depth is greater than a depth threshold.

8. The hybrid power system according to claim 2, characterized in that, The operating condition identification unit is used to determine that the transmission is in a second operating state when the power system parameter is less than the second parameter threshold and the duration reaches the second duration; wherein the second parameter threshold is less than the first parameter threshold; The power limiting unit is used to release the output power limitation on the engine and the electric motor when the transmission is in the second operating state.

9. A control method, characterized in that, The method is used in a hybrid power system, the system including an engine, an electric motor, a transmission, wheels, a transmission protection module, and a controller; The engine is connected to the input shaft of the gearbox, the electric motor is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the wheel axle of the wheel via a differential. The method includes: When the transmission is in the first operating state, the transmission protection module sends a power limiting signal to the controller; in the first operating state, the power system parameters corresponding to the hybrid power system are greater than the first parameter threshold and the duration reaches the first duration. Based on the power limiting signal, the controller controls the output power of the engine and the electric motor.

10. A hybrid vehicle, characterized in that, The hybrid vehicle includes the hybrid system as described in any one of claims 1 to 8.

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