Hybrid system and control method, vehicle

Abstract

The application discloses a kind of hybrid power system and control method, vehicle, belong to hybrid electric vehicle technical field, including respectively with vehicle controller through control signal wire bundle connection power motor controller, power battery management system, voltage converter management system and engine management system, the power motor controller is connected with power motor inverter and power motor through control signal wire bundle, the power battery management system is connected with power battery through control signal wire bundle, the voltage converter management system is connected with voltage converter through control signal wire bundle, the engine management system is connected with engine through control signal wire bundle, the power motor inverter and power motor, power battery, voltage converter and engine are connected by high voltage wire bundle each other.The application realizes dynamic adjustment high safety margin.

Description

Technical Field

[0001] This invention discloses a hybrid power system and control method, as well as a vehicle, belonging to the field of hybrid vehicle technology. Background Technology

[0002] When a hybrid vehicle operates under full load, the efficiency of the electric motor decreases due to its operating characteristics, leading to a rapid increase in power demand and heat generation. This causes the electric motor to heat up quickly, resulting in the cooling water pump and cooling fan in the thermal management system operating at full load. This further increases the power demand, causing the battery to over-discharge. Over-discharging of the battery, in turn, leads to a rapid decrease in battery efficiency and a rapid increase in heat generation. This causes the cooling water pump and air conditioning compressor in the thermal management system to operate at full load, further increasing the power demand and leading to continued over-discharging of the battery. This shortens the battery's lifespan and increases the risk of thermal runaway. Furthermore, the engine's slow torque response results in a slow drive power response, and the insufficient drive power is borne by the electric motor, further increasing the battery's discharge power.

[0003] The time delay in signal transmission between controllers and the lack of accurate data on the power and efficiency characteristics of components in the thermal management system increase the risk of over-discharge of the power battery.

[0004] The conventional solution is to set a safety margin. If the safety margin is set too small, the risk of over-discharge of the power battery cannot be completely eliminated. If the safety margin is set too large, the battery's discharge performance cannot be fully utilized, thereby reducing the overall vehicle performance.

[0005] The power battery is passively controlled. The battery management system cannot control the output power. It can only send the upper limit of the output power to the vehicle controller, which then limits the power demand on the power battery. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention proposes a hybrid power system, control method, and vehicle, which solves the problem of how to prevent over-discharge of the power battery while fully utilizing its discharge performance when the vehicle is operating at full load or when the power battery's discharge capacity is limited, thereby ensuring the vehicle's performance.

[0007] The technical solution of the present invention is as follows:

[0008] According to a first aspect of the present invention, a hybrid power system is provided, comprising a power motor controller, a power battery management system, a voltage converter management system, and an engine management system, all connected to a vehicle controller via control signal harnesses. The power motor controller is connected to a power motor inverter and a power motor via control signal harnesses. The power battery management system is connected to a power battery via control signal harnesses. The voltage converter management system is connected to a voltage converter via control signal harnesses. The engine management system is connected to an engine via control signal harnesses. The power motor inverter, power motor, power battery, voltage converter, and engine are interconnected via high-voltage harnesses.

[0009] Preferably, the power motor controller is used to control the operation of the power motor inverter and the power motor;

[0010] The power battery management system is used to monitor the operating status of the power battery.

[0011] Preferably, it is used to control the operation of the voltage converter;

[0012] The engine management system is used to control the operation of the engine.

[0013] Preferably, it is used to exchange control information with the power motor controller, the power battery management system, the voltage converter management system, and the engine management system.

[0014] According to a second aspect of the present invention, a control method for a hybrid power system is provided, comprising:

[0015] When the vehicle controller detects that the working load of the power motor has entered the high load area, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the first adjustment strategy is executed.

[0016] When the vehicle controller detects that the output power of the voltage converter has entered the high load area, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the second adjustment strategy is executed.

[0017] When the vehicle controller detects that the cooling water temperature of the power motor exceeds the warning value and the rate of change of temperature rise exceeds the rate of change threshold, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the third adjustment strategy is executed.

[0018] When the vehicle controller detects that the maximum discharge power limit sent by the power battery to the vehicle controller will be reduced, and when it detects that the difference between the upper limit of the maximum discharge power sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the fourth adjustment strategy is executed.

[0019] When the vehicle controller detects that the engine torque response is lower than the vehicle controller's demand for engine torque, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the fifth adjustment strategy is executed.

[0020] Preferably, the first adjustment strategy includes: increasing the proportional coefficient according to the decrease in the efficiency of the power motor to dynamically increase the safety margin; the second adjustment strategy includes: increasing the proportional coefficient according to the increase in the cooling water temperature of the power motor to dynamically increase the safety margin.

[0021] Preferably, the third adjustment strategy includes: increasing the proportional coefficient according to the decrease in the maximum discharge power limit of the power battery to dynamically increase the safety margin; the fourth adjustment strategy includes: increasing the proportional coefficient according to the lag in the response of the engine torque to dynamically increase the safety margin.

[0022] Preferably, the fifth adjustment strategy includes: increasing the proportional coefficient according to the lag in the response of the engine torque to dynamically increase the safety margin, wherein the high load zone is defined as a load rate higher than 80%, the change rate threshold is 0.5℃ / s, and the safety margin threshold is 10kW.

[0023] Preferably, the safety margin is obtained by formula (1):

[0024] S = max[(DP - dp) * A, 0] (1)

[0025] Where S is the safety margin, DP is the maximum discharge power limit sent by the power battery to the vehicle controller, dp is the actual discharge power of the power battery, and A is the proportional coefficient.

[0026] According to a third aspect of the present invention, a vehicle is provided, including a hybrid power system as described in the first aspect.

[0027] The advantages of this invention compared to existing technologies are as follows:

[0028] This invention discloses a hybrid power system and control method, as well as a vehicle. The system allows the vehicle controller to exchange control information with the power motor controller, power battery management system, voltage converter management system, and engine management system. The system controls the normal operation of the vehicle by dynamically adjusting the proportional coefficient based on the power motor's operating efficiency, the voltage converter's output power, the power motor's coolant temperature changes, the changes in the maximum discharge power limit signal sent by the power battery to the vehicle controller, and the engine torque response rate, thereby dynamically increasing the safety margin. Attached Figure Description

[0029] Figure 1 This is a structural block diagram of a hybrid power system according to the present invention. Detailed Implementation

[0030] The following is based on the appendix Figure 1 Further explanation of the present invention:

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figure 1As shown, the first embodiment of the present invention provides a hybrid power system based on the prior art, including a power motor controller, a power battery management system, a voltage converter management system, and an engine management system, all connected to the vehicle controller via control signal harnesses. The power motor controller is connected to the power motor inverter and the power motor via control signal harnesses. The power battery management system is connected to the power battery via control signal harnesses. The voltage converter management system is connected to the voltage converter via control signal harnesses. The engine management system is connected to the engine via control signal harnesses. The power motor inverter, the power motor, the power battery, the voltage converter, and the engine are interconnected via high-voltage harnesses.

[0035] The aforementioned power motor controller controls the operation of the power motor inverter and the power motor; the power battery management system monitors the operating status of the power battery; the voltage converter management system controls the operation of the voltage converter; and the engine management system controls the operation of the engine. The vehicle controller exchanges control information with the power motor controller, power battery management system, voltage converter management system, and engine management system to ensure the normal operation of the vehicle.

[0036] The second embodiment of the present invention provides a control method for a hybrid power system based on the first embodiment, comprising:

[0037] When the vehicle controller detects that the working load of the power motor has entered the high load area, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the first adjustment strategy is executed.

[0038] The first adjustment strategy is to increase the proportional coefficient based on the decrease in the efficiency of the power motor, so as to dynamically increase the safety margin.

[0039] When the vehicle controller detects that the output power of the voltage converter has entered the high load area, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the second adjustment strategy is executed.

[0040] The second adjustment strategy is to increase the proportional coefficient according to the increase in the cooling water temperature of the motor, so as to dynamically increase the safety margin.

[0041] When the vehicle controller detects that the cooling water temperature of the power motor exceeds the warning value and the rate of change of temperature rise exceeds the rate of change threshold, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the third adjustment strategy is executed.

[0042] The third adjustment strategy is to increase the proportional coefficient according to the decrease in the maximum discharge power limit of the power battery, so as to dynamically increase the safety margin; the fourth adjustment strategy.

[0043] When the vehicle controller detects that the maximum discharge power limit sent by the power battery to the vehicle controller will be reduced, and when it detects that the difference between the upper limit of the maximum discharge power sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the fourth adjustment strategy is executed.

[0044] The fourth adjustment strategy includes: increasing the proportional coefficient based on the lag in the response of the engine torque to dynamically increase the safety margin.

[0045] When the vehicle controller detects that the engine torque response is lower than the vehicle controller's demand for engine torque, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the fifth adjustment strategy is executed.

[0046] The aforementioned high-load zone is preferably characterized by a load factor higher than 80%, a change rate threshold preferably of 0.5℃ / s, and a safety margin threshold preferably of 10kW. The safety margin is derived using formula (1):

[0047] S = max[(DP - dp) * A, 0] (1)

[0048] Where S is the safety margin, DP is the maximum discharge power limit sent by the power battery to the vehicle controller, dp is the actual discharge power of the power battery, and A is the proportional coefficient.

[0049] The third embodiment of the present invention provides a vehicle based on the first embodiment, including a hybrid power system as described in the first embodiment.

[0050] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A control method for a hybrid power system, used to control the hybrid power system, the hybrid power system comprising a power motor controller, a power battery management system, a voltage converter management system, and an engine management system respectively connected to a vehicle controller via control signal harnesses, the power motor controller being connected to a power motor inverter and a power motor via control signal harnesses, the power battery management system being connected to a power battery via control signal harnesses, the voltage converter management system being connected to a voltage converter via control signal harnesses, the engine management system being connected to an engine via control signal harnesses, and the power motor inverter, power motor, power battery, voltage converter, and engine being interconnected via high-voltage harnesses; The power motor controller is used to control the operation of the power motor inverter and the power motor. The power battery management system is used to monitor the operating status of the power battery; The voltage converter management system is used to control the operation of the voltage converter; The engine management system is used to control the engine operation; The vehicle controller is used to exchange control information with the power motor controller, the power battery management system, the voltage converter management system, and the engine management system, and is characterized by including: When the vehicle controller detects that the working load of the power motor has entered the high load area, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the first adjustment strategy is executed. When the vehicle controller detects that the output power of the voltage converter has entered the high load area, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the second adjustment strategy is executed. When the vehicle controller detects that the cooling water temperature of the power motor exceeds the warning value and the rate of change of temperature rise exceeds the rate of change threshold, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the third adjustment strategy is executed. When the vehicle controller detects that the maximum discharge power limit sent by the power battery to the vehicle controller has decreased, and when it detects that the difference between the upper limit of the maximum discharge power sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the fourth adjustment strategy is executed. When the vehicle controller detects that the engine torque response is lower than the vehicle controller's demand for engine torque, and when it detects that the difference between the maximum discharge power limit sent by the power battery to the vehicle controller and the actual discharge power of the power battery is less than the safety margin threshold, the fifth adjustment strategy is executed.

2. The control method for a hybrid power system according to claim 1, characterized in that, The first adjustment strategy includes: increasing the proportional coefficient according to the decrease in the efficiency of the power motor to dynamically increase the safety margin; the second adjustment strategy includes: increasing the proportional coefficient according to the increase in the cooling water temperature of the power motor to dynamically increase the safety margin.

3. The control method for a hybrid power system according to claim 2, characterized in that, The third adjustment strategy includes: increasing the proportional coefficient based on the decrease in the maximum discharge power limit of the power battery to dynamically increase the safety margin; the fourth adjustment strategy includes: increasing the proportional coefficient based on the lag in the response of the engine torque to dynamically increase the safety margin.

4. The control method for a hybrid power system according to claim 3, characterized in that, The fifth adjustment strategy includes: increasing the proportional coefficient based on the lag in the response of engine torque to dynamically increase the safety margin, wherein the high load zone is defined as a load rate higher than 80%, the change rate threshold is 0.5℃ / s, and the safety margin threshold is 10kW.

5. The control method for a hybrid power system according to claim 4, characterized in that, The safety margin is obtained by formula (1): S=max[(DP-dp)*A,0] (1) Where S is the safety margin, DP is the maximum discharge power limit sent by the power battery to the vehicle controller, dp is the actual discharge power of the power battery, and A is the proportional coefficient.

6. A vehicle for controlling a control method of a hybrid power system according to any one of claims 1-5.

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