Hybrid vehicle and high-voltage battery control method and device therefor

Abstract

The application relates to a hybrid vehicle and a high-voltage battery control method and device thereof, which are applied to an HCU. The high-voltage battery control method comprises the following steps: if a predetermined condition is met when a main relay of a high-voltage battery of the hybrid vehicle is closed, a drive motor of the hybrid vehicle is controlled to make the rotation speed of the drive motor reach a first idle speed; a high-voltage disconnection instruction for disconnecting the main relay is sent to the high-voltage battery; the drive motor is controlled to make the rotation speed of the drive motor reach a second idle speed, the second idle speed being higher than the first idle speed; and the drive motor is controlled to make the drive motor output a predetermined voltage for heating the high-voltage battery. Therefore, the high-voltage battery can be heated without using the power of the high-voltage battery when the power of the high-voltage battery is low.

Description

Technical Field

[0001] This invention relates to the field of hybrid vehicle technology, and more particularly to a hybrid vehicle and its high-voltage battery control method and apparatus. Background Technology

[0002] Figure 1 This is a schematic diagram of the powertrain structure of a hybrid electric vehicle in related technologies. For example... Figure 1 As shown, the hybrid vehicle includes a high-voltage battery, an engine, a K0 clutch, a drive motor, and a gearbox. The K0 clutch is located between the engine and the drive motor. Figure 2 This is a schematic diagram of the high-voltage battery system structure. Figure 2 It is known that the high-voltage battery can provide power to the motor controller and the positive temperature coefficient (PTC) heating device used to heat the high-voltage battery, while using a DC-DC converter to power the vehicle's low-voltage battery.

[0003] If the high-voltage battery temperature is too low (e.g., below a threshold), it cannot provide power to the hybrid vehicle. Therefore, the high-voltage battery needs to be preheated to increase its temperature and thus its discharge capacity. Specifically, the high-voltage battery sends a heating request to the Hybrid Control Unit (HCU) via a Controller Area Network (CAN) message. The HCU receives the heating request and sends a closing command to the high-voltage relay and a heating command to the PTC heating device via a CAN message. The high-voltage battery closes the high-voltage relay upon receiving the closing command, and the PTC heating device begins heating the high-voltage battery. In this scenario, the high-voltage battery's own charge is used to heat itself (i.e., the high-voltage battery uses the PTC heating device to preheat itself).

[0004] As mentioned above, if the high-voltage battery temperature is too low, the high-voltage battery uses a PTC heating device to preheat itself, and the heating energy of the high-voltage battery comes from its own charge. However, in some cases, if the high-voltage battery charge is low, the high-voltage battery cannot use this low charge to heat itself using the PTC heating device (i.e., preheat the high-voltage battery). Furthermore, if the high-voltage battery temperature is too low, the high-voltage battery's allowable charging power is low, resulting in the inability to charge the high-voltage battery, which in turn prevents the high-voltage battery from providing power to the hybrid vehicle, ultimately causing the hybrid vehicle to become immobile. Summary of the Invention

[0005] The purpose of this invention is to overcome or at least mitigate the shortcomings of the prior art and to provide a hybrid electric vehicle and its high-voltage battery control method and apparatus.

[0006] According to one aspect of the present invention, a high-voltage battery control method for a hybrid electric vehicle is provided, applied to an HCU (High-Voltage Unit). The high-voltage battery control method includes: when the main relay of the high-voltage battery of the hybrid electric vehicle is closed, if a predetermined condition is met, controlling the drive motor of the hybrid electric vehicle to reach a first idle speed; sending a high-voltage disconnection command to the high-voltage battery to disconnect the main relay; controlling the drive motor to reach a second idle speed, the second idle speed being higher than the first idle speed; and controlling the drive motor to output a predetermined voltage for heating the high-voltage battery.

[0007] In one possible design, the predetermined conditions include: receiving a heating request for heating the high-voltage battery, and the charge of the high-voltage battery being less than or equal to a first calibration value.

[0008] In one possible design, the predetermined conditions further include: the hybrid vehicle is stationary; and / or the permissible charging power of the high-voltage battery is less than or equal to a second calibration value.

[0009] In one possible design, after controlling the drive motor to reach a first idle speed, the control method further includes: detecting whether a PTC heating device for heating the high-voltage battery is in a normal state; if the PTC heating device is detected to be in the normal state, sending a high-voltage disconnect command to the high-voltage battery to disconnect the main relay.

[0010] In one possible design, controlling the drive motor to output a predetermined voltage for heating the high-voltage battery includes controlling the drive motor such that it supplies the predetermined voltage to a PTC device for heating the high-voltage battery via its own power module.

[0011] According to another aspect of the present invention, a high-voltage battery control device for a hybrid electric vehicle is provided, the high-voltage battery control device comprising: a first adjustment module for controlling the drive motor of the hybrid electric vehicle to reach a first idle speed when the main relay of the high-voltage battery of the hybrid electric vehicle is closed, provided that a predetermined condition is met; a communication module for sending a high-voltage disconnection command to the high-voltage battery for disconnecting the main relay; a second adjustment module for controlling the drive motor to reach a second idle speed, the second idle speed being higher than the first idle speed; and a control module for controlling the drive motor to output a predetermined voltage for heating the high-voltage battery.

[0012] In one possible design, the predetermined conditions include: the high-voltage battery control device receiving a heating request for heating the high-voltage battery, and the charge of the high-voltage battery being less than or equal to a first calibration value.

[0013] In one possible design, the predetermined conditions further include: the hybrid vehicle is stationary; and / or the permissible charging power of the high-voltage battery is less than or equal to a second calibration value.

[0014] In one possible design, the first adjustment module is further configured to: after controlling the drive motor to reach a first idle speed, detect whether the PTC heating device for heating the high-voltage battery is in a normal state; the communication module is further configured to: if the first adjustment module detects that the PTC heating device is in the normal state, send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay.

[0015] In one possible design, the control module is configured to control the drive motor such that the drive motor supplies the predetermined voltage to the PTC device used to heat the high-voltage battery via its own power module.

[0016] According to another aspect of the present invention, a hybrid electric vehicle is provided, comprising: a high-voltage battery, a drive motor, and a high-voltage battery control device according to the above-described other aspect.

[0017] According to the hybrid electric vehicle and its high-voltage battery control method and apparatus of the present invention, when the main relay of the high-voltage battery is closed, if a predetermined condition is met (under which the high-voltage battery cannot provide power to the hybrid electric vehicle, for example, the predetermined condition may include, but is not limited to, the low charge and low temperature of the high-voltage battery), the drive motor speed is increased to a first idle speed, and the main relay of the high-voltage battery is disconnected; the drive motor speed is increased to a second idle speed higher than the first idle speed, and the drive motor outputs a predetermined voltage for heating the high-voltage battery. Therefore, compared with the prior art that uses the charge of the high-voltage battery to preheat the high-voltage battery via a PTC heating device to increase the temperature of the high-voltage battery and thus provide power to the hybrid electric vehicle, the present invention uses the predetermined voltage output by the drive motor to heat the high-voltage battery regardless of the charge of the high-voltage battery, thereby increasing the temperature of the high-voltage battery and thus providing power to the hybrid electric vehicle. This can avoid the hybrid electric vehicle becoming immobile due to the high-voltage battery's inability to provide power.

[0018] Other features and aspects of the invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of the invention together with the specification and serve to explain the principles of the invention.

[0020] Figure 1 This is a schematic diagram of the powertrain structure of a hybrid electric vehicle in related technologies.

[0021] Figure 2 This is a schematic diagram of the system structure of a high-voltage battery in related technologies.

[0022] Figure 3 This is a flowchart illustrating a high-voltage battery control method for a hybrid electric vehicle according to an exemplary embodiment.

[0023] Figure 4 This is a flowchart illustrating a high-voltage battery control method for a hybrid electric vehicle according to an exemplary embodiment.

[0024] Figure 5 This is a block diagram illustrating a high-voltage battery control device for a hybrid electric vehicle according to an exemplary embodiment. Detailed Implementation

[0025] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0026] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0027] Furthermore, to better illustrate the present invention, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that the present invention can be practiced without certain specific details. In other instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order to highlight the spirit of the invention.

[0028] Figure 2 This is a schematic diagram of a high-voltage battery system used in a hybrid electric vehicle. The hybrid electric vehicle can be either a HEV or a PHEV. For example, the powertrain structure of this hybrid electric vehicle can adopt... Figure 1 Please refer to the structure shown. Figure 1 The hybrid vehicle may include a high-voltage battery, an engine, a K0 clutch, a drive motor, and a transmission. The K0 clutch is located between the engine and the drive motor. The high-voltage battery typically has a voltage of 100–400V, and the drive motor may be, for example, a P2 motor.

[0029] Please see Figure 2 The high-voltage battery system includes a main relay, a pre-charge relay, and a pre-charge resistor R. The main relay includes a main positive relay on the positive side of the high-voltage battery system and a main negative relay on the negative side of the high-voltage battery system.

[0030] The pre-charge relay controls the opening and closing of the pre-charge circuit; it connects the pre-charge circuit for self-testing before the main relay operates. The pre-charge resistor R acts as a protective resistor with current-limiting function, effectively preventing damage to other electronic components in the high-voltage battery system from the large current at the moment of power-on.

[0031] Specifically, the startup process of the high-voltage battery is as follows:

[0032] When a hybrid vehicle needs to be powered on, the high-voltage battery system is activated and enters initialization mode, undergoing a self-test. If no fault is detected, the high-voltage battery sends a pre-ready status report to the HCU, checking for sticking between the main positive and negative relays (i.e., the main positive and negative relays cannot be disconnected). If neither relay is stuck, the high-voltage battery system switches from initialization mode to standby mode. Upon receiving a high-voltage closing command from the HCU, it closes the pre-charge relay and the main negative relay for a pre-charge period, typically no more than 600ms. After pre-charging, the high-voltage battery system closes the main positive relay and simultaneously opens the pre-charge relay, completing the power-on process. At this time, the high-voltage battery system continuously supplies power to the hybrid vehicle's electrical equipment (e.g., drive motor, ignition system, air conditioning, various onboard instruments, and auxiliary electrical equipment).

[0033] like Figure 2 As shown, the high-voltage battery provides power to the drive motor controller and the PTC heating device used to heat the high-voltage battery. The motor controller is connected to the drive motor and is used to control the drive motor, which can be, for example, a P2 motor. At the same time, the high-voltage battery provides power to the low-voltage battery through a DC-DC converter to power low-voltage electrical equipment (such as vehicle lights, various vehicle instruments, control systems, small electrical appliances and other vehicle accessories). The low-voltage battery provided can be, for example, a 12V low-voltage battery.

[0034] As described in the background art, if the temperature of the high-voltage battery is too low, the high-voltage battery uses a PTC heating device to preheat itself, and the heating energy of the high-voltage battery comes from its charge. However, in some cases, if the charge of the high-voltage battery is low, the high-voltage battery cannot use this low charge to heat itself. Furthermore, if the temperature of the high-voltage battery is too low, the allowable charging power of the high-voltage battery is low, resulting in the inability to charge the high-voltage battery, which in turn prevents the high-voltage battery from providing power to the hybrid vehicle, ultimately causing the hybrid vehicle to be unable to move. In view of this, this application provides a high-voltage battery control scheme for a hybrid vehicle, which can heat the high-voltage battery to start it when the charge of the high-voltage battery is low and the allowable charging power is low, thereby providing power to the hybrid vehicle and enabling the normal operation of the hybrid vehicle.

[0035] Figure 3 This is a flowchart illustrating a high-voltage battery control method for a hybrid electric vehicle according to an exemplary embodiment. This high-voltage battery control method can be applied to the HCU (Hybrid Control Unit) of a hybrid electric vehicle. That is, the HCU can use the high-voltage battery control method of this embodiment to heat the high-voltage battery of the hybrid electric vehicle.

[0036] like Figure 3 As shown, the battery control method may include the following steps.

[0037] In step S31, if the predetermined conditions are met when the main relay of the high-voltage battery is closed, the drive motor is controlled to reach the first idle speed.

[0038] In this embodiment, the predetermined condition is used to describe the condition that the high-voltage battery cannot heat itself with a low amount of electricity, and can be specifically designed in the actual implementation.

[0039] In one possible implementation, the aforementioned predetermined conditions may include: Condition 1, the HCU receives a heating request for heating the high-voltage battery; Condition 2, the charge of the high-voltage battery is less than or equal to a first calibration value. If both Condition 1 and Condition 2 are satisfied, it can be determined that the predetermined conditions are met. In this case, the high-voltage battery has a heating requirement and cannot use its low charge to heat itself.

[0040] In this embodiment, the charge of the high-voltage battery can be characterized by its actual charge, i.e., the remaining charge in the high-voltage battery. The first calibration value is typically determined flexibly by the designer based on the actual charge of the battery when the vehicle is not operating normally, and can be expressed as a percentage of the actual charge to the rated charge. For example, if the actual charge of the high-voltage battery is less than or equal to 5%, the charge can be considered to be less than or equal to the first calibration value.

[0041] In one possible implementation, the predetermined conditions may further include condition three and / or condition four. Condition three: the hybrid vehicle is stationary; condition four: the permissible charging power of the high-voltage battery is less than or equal to the second calibration value.

[0042] The second calibration value is an empirical value determined by the designers based on the actual physical state of the high-voltage battery. When the allowable charging power of the high-voltage battery is less than or equal to the second calibration value, it is determined that the high-voltage battery cannot be charged. Under predetermined conditions, including condition four, the high-voltage battery has a heating requirement and cannot use its own low power to heat itself, nor can it charge itself to increase its power through a charger or other methods.

[0043] In this embodiment of the application, for step S31 above, the HCU can control the drive motor to reach the first idle speed in the following manner: send a neutral command to the gearbox with the target gear as neutral to switch the gear to neutral; send an engagement command to the clutch to fully engage the clutch; send a control mode command to the drive motor to put the drive motor's operating mode in speed control mode and a first idle speed command to indicate that the target speed is the first idle speed, so that the speed of the drive motor increases from zero to the first idle speed.

[0044] The transmission can detect whether the current gear is in neutral upon receiving a neutral command. If the current gear is detected to be in neutral, the transmission will send feedback to the HCU indicating that the current gear is in neutral. Conversely, if the current gear is not detected to be in neutral, the transmission will shift the current gear to neutral and send feedback of the neutral status to the HCU.

[0045] As described above, the HCU can send the aforementioned control mode command to the drive motor, and the drive motor, in response to receiving the control mode command, puts itself into speed control mode. Furthermore, the HCU also sends the aforementioned first idle speed command to the drive motor, and the drive motor, in response to receiving the first idle speed command, increases its speed from zero to the first idle speed. It should be understood that when the drive motor's speed reaches the first idle speed, the HCU can send a control mode command to the drive motor to put its operating mode into standby mode. Accordingly, the drive motor, in response to receiving the control mode command, puts itself into standby mode.

[0046] The above-described method for controlling the drive motor to reach the first idle speed is merely an example. This embodiment is not limited to this. Those skilled in the art should be able to use other related technologies in the prior art to make the drive motor reach the first idle speed.

[0047] Because the clutch fully engages in response to the fully engaged engagement command received during the control process of the drive motor reaching the first idle speed, the drive motor can output torque to the engine to drag the engine speed from zero to a threshold speed below the first idle speed. When the engine speed is higher than this threshold speed, the engine starts (ignites) and enters the running state. The HCU can send an idle speed control command to the engine to run at idle speed and a first idle speed command to indicate that the target speed is the first idle speed. In response to receiving the idle speed control command and the first idle speed command, the engine adjusts its speed to the first idle speed.

[0048] In this embodiment, since the drive motor is controlled to be in standby mode when the speed of the drive motor reaches the first idle speed, and the drive motor is only in a powered state and does not perform other actions in standby mode, the power consumption of the drive motor can be reduced.

[0049] In step S32, a high-voltage disconnection command is sent to the high-voltage battery to disconnect the main relay.

[0050] Continuing with the high-voltage battery control method described above, step S32 is executed. The high-voltage disconnect command is used to disconnect the main positive relay and the main negative relay of the high-voltage battery, thereby disconnecting the high-voltage battery from the power supply to the load.

[0051] After receiving a high-voltage disconnection command, the high-voltage battery disconnects the main positive relay and the main negative relay. Since the high-voltage battery is in a high-voltage disconnection state, the hybrid vehicle does not receive power from the high-voltage battery.

[0052] Step S33: Control the drive motor to reach a second idle speed, which is higher than the first idle speed.

[0053] In this embodiment of the application, controlling the drive motor to reach the second idle speed can be achieved through the following process: sending a second idle speed command to the engine to indicate that the target speed is the second idle speed, controlling the engine speed to reach the second idle speed, and in this process, the engine drags the drive motor to reach the second idle speed.

[0054] The above-described method for controlling the drive motor to reach the second idle speed is merely an example. This embodiment is not limited to this, and those skilled in the art should be able to use other related technologies to make the drive motor reach the second idle speed.

[0055] Step S34: Control the drive motor to output a predetermined voltage for heating the high-voltage battery.

[0056] In one possible implementation, controlling the drive motor to output a predetermined voltage can be achieved by sending a constant-voltage inverter mode control command to the drive motor, causing the drive motor to supply the predetermined voltage to the PTC heating device used to heat the high-voltage battery via its own power module. Optionally, the drive motor provides the predetermined voltage to the PTC device via its own IGBT module, and the predetermined voltage is typically a constant voltage.

[0057] The high-voltage battery control method and apparatus of this application, when the main relay of the high-voltage battery is closed, if a predetermined condition is met, causes the speed of the drive motor to reach a first idle speed and disconnects the main relay of the high-voltage battery; causes the speed of the drive motor to reach a second idle speed higher than the first idle speed, and causes the drive motor to output a predetermined voltage for heating the high-voltage battery. Therefore, compared with the prior art that uses the charge of the high-voltage battery to preheat the high-voltage battery via a PTC heating device to increase the temperature of the high-voltage battery and thus provide power to the hybrid vehicle, the present invention uses the predetermined voltage output by the drive motor to heat the high-voltage battery regardless of the charge of the high-voltage battery, thereby increasing the temperature of the high-voltage battery and thus providing power to the hybrid vehicle. This can avoid the hybrid vehicle being unable to move due to the high-voltage battery being unable to provide power to the hybrid vehicle.

[0058] Furthermore, since the high-voltage battery control method for hybrid electric vehicles in this embodiment can be implemented using existing components of the hybrid electric vehicle without adding any additional components, it does not increase the cost of the hybrid electric vehicle and is easy to implement.

[0059] In one possible implementation, after executing step S31, the high-voltage battery control method may further include: detecting whether the PTC heating device used to heat the high-voltage battery is in a normal state; if the PTC heating device is detected to be in the normal state, then executing step S32 to send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay.

[0060] After executing step S31, it is checked whether the PTC heating device is in a normal state. If the PTC heating device is detected to be in an abnormal state, step S32 can be skipped. This can avoid the situation where the high-voltage battery cannot be heated due to the abnormality of the PTC heating device, and the subsequent instructions cannot be executed. This can further reduce the energy consumption of the high-voltage battery.

[0061] In one possible implementation, after executing step S31, the high-voltage battery control method may further include: detecting whether the DC-DC converter is in a normal state; if the DC-DC converter is detected to be in the normal state, then executing step S32 to send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay.

[0062] In one possible implementation, after executing step S31, the high-voltage battery control method may further include: detecting whether both the PTC heating device and the DC-DC converter are in normal condition; if both are detected to be in normal condition, then executing step S32 to send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay.

[0063] Before sending a high-voltage disconnect command to the high-voltage battery, it is ensured that the PTC heating device is in normal condition to guarantee heating of the high-voltage battery, and that the DC-DC converter is in normal condition to guarantee power supply to the low-voltage power source.

[0064] In one possible implementation, detecting whether the PTC heating device is in a normal state can be achieved as follows: the HCU sends a standby mode command to the PTC heating device. After receiving the command, the PTC checks whether it is in a normal state and reports its own status back to the HCU. The HCU then checks whether the PTC heating device is in a normal state based on the status feedback.

[0065] In one possible implementation, detecting whether the DC-DC converter is in a normal state can be achieved as follows: the HCU sends a standby mode command to the DC-DC converter. After receiving the command, the DC-DC converter checks whether it is in a normal state and reports its status back to the HCU. The HCU then checks whether the DC-DC converter is in a normal state based on the status feedback.

[0066] In one possible implementation, after executing step S32, the above-mentioned high-voltage battery control method may further include: detecting the voltage of the drive motor; if the voltage of the drive motor is detected to be continuously decreasing and lower than the set voltage calibration value, determining that the high-voltage battery is in a high-voltage disconnection state, then executing step S33 to control the drive motor to reach the second idle speed.

[0067] In one possible implementation, after executing step S33, the above-mentioned high-voltage battery control method may further include: detecting the actual speed of the engine and the actual speed of the drive motor; if it is detected that the speeds of both the engine and the drive motor are close to the second idle speed (e.g., the deviation from the second idle speed is less than a set value), then step S34 is executed to control the drive motor to output a predetermined voltage for heating the high-voltage battery.

[0068] In one possible implementation, the HCU can obtain the actual speed of the drive motor by receiving, for example, a message sent by the drive motor controller, and then obtaining the actual speed of the drive motor based on the message, wherein the message may carry the current actual speed of the drive motor.

[0069] In one possible implementation, the HCU can obtain the actual engine speed by acquiring the input shaft speed obtained from the transmission input shaft speed sensor, wherein the input shaft speed is the actual engine speed.

[0070] It should be understood that the above-described methods for obtaining the actual speed of the drive motor and the actual speed of the engine are merely examples, and this embodiment is not limited thereto. Those skilled in the art should be able to use other related technologies to obtain the actual speed of the drive motor and the actual speed of the engine.

[0071] In one possible implementation, after executing step S34, the above-mentioned high-voltage battery control method may further include: detecting the output voltage of the drive motor; if the output voltage of the drive motor is detected to be stable near a predetermined value for a period of time, executing: sending a step-down control command to the DC-DC converter to provide low-voltage power using the DC-DC converter, and / or sending a heating command to the PTC heating device to heat the high-voltage battery using the PTC heating device.

[0072] In one possible implementation, after executing step S34, the high-voltage battery control method may further include: if a heating request for the high-voltage battery is not detected or an error or malfunction is detected in the drive motor, controlling the power module of the drive motor to enter a power-off process, thereby disconnecting the power module of the drive motor from the power supply of the PTC heating device and the DC-DC converter.

[0073] Figure 4 This is a flowchart illustrating a high-voltage battery control method for a hybrid electric vehicle according to an exemplary embodiment. This high-voltage battery control method can be used in, for example... Figure 1 The hybrid vehicle shown includes the following processes:

[0074] In step S40, if the key to the hybrid vehicle is detected to be inserted into the ON position, a system error is checked. If no system error is detected, step S41 is executed; if a system error is detected, step S49 is executed.

[0075] In step S41, the HCU sends a high-voltage closing command to the high-voltage battery to close the main relay (including the pre-charging process) to start the high-voltage battery.

[0076] After receiving the high-voltage closing command, the high-voltage battery executes the high-voltage battery startup process.

[0077] In step S42, the HCU detects whether the following four conditions are met: a: the charge of the high-voltage battery is less than or equal to the first calibration value; b: the hybrid vehicle is stationary; c: the allowable charging power of the high-voltage battery is less than or equal to the second calibration value; d: the high-voltage battery has a heating request. If all four conditions are met, S43 is executed; otherwise, S49 is executed.

[0078] In step S43, the HCU controls both the engine and the drive motor to reach the first idle speed.

[0079] In step S44, the HCU sends standby mode commands to the DC-DC and PTC heating devices respectively.

[0080] After receiving the standby mode command, the DC-DC and PTC heating devices check whether their own status is normal and report their status to the HCU. The HCU checks whether the status feedback of the DC-DC and PTC is normal. If the status feedback of both the DC-DC and PTC heating devices is normal, S45 is executed.

[0081] In step S45, the HCU sends a high-voltage disconnect command to the high-voltage battery and detects the voltage of the drive motor. If the voltage of the drive motor drops and is lower than the set voltage calibration value, it determines that the high-voltage battery is in a high-voltage disconnect state and continues to execute S46.

[0082] In step S46, the HCU controls the speed of both the engine and the drive motor to increase from the first idle speed to the second idle speed.

[0083] In step S47, the HCU sends a constant voltage inverter mode control command to the drive motor to control the IGBT module of the drive motor to output a constant voltage.

[0084] In step S48, the HCU sends a buck control command to the DC-DC converter and a heating command to the PTC heating device. The hybrid vehicle continues to operate during this stage.

[0085] In step S49, the HCU detects that there is no heating request from the high-voltage battery or detects an error or malfunction in the drive motor, and the IGBT module controlling the drive motor enters the power-off process.

[0086] Figure 5 This is a block diagram illustrating a high-voltage battery control device for a hybrid electric vehicle (HEV or PHEV) according to an exemplary embodiment. The HEV includes a high-voltage battery, an engine, a drive motor, and a clutch disposed between the engine and the drive motor. Figure 5 As shown, the high-voltage battery control device 500 may include a first adjustment module 510, a communication module 520, a second adjustment module 530, and a control module 540.

[0087] A first adjustment module 510 is used to control the drive motor of the hybrid vehicle to reach a first idle speed when the main relay of the high-voltage battery is closed, provided that predetermined conditions are met. A communication module 520 is used to send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay. A second adjustment module 530 is used to control the drive motor to reach a second idle speed, which is higher than the first idle speed. A control module 540 is used to control the drive motor to output a predetermined voltage for heating the high-voltage battery.

[0088] In one possible implementation, the predetermined conditions include: the high-voltage battery control device receiving a heating request for heating the high-voltage battery, and the charge of the high-voltage battery being less than or equal to a first calibration value.

[0089] In one possible implementation, the predetermined conditions further include: the hybrid vehicle is stationary; and / or the permissible charging power of the high-voltage battery is less than or equal to a second calibration value.

[0090] In one possible implementation, the first adjustment module 510 is further configured to: after controlling the drive motor to reach a first idle speed, detect whether the PTC heating device for heating the high-voltage battery is in a normal state; the communication module 520 is further configured to: if the first adjustment module detects that the PTC heating device is in the normal state, send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay.

[0091] In one possible implementation, the control module 540 is configured to control the drive motor such that the drive motor supplies the predetermined voltage to a PTC device for heating the high-voltage battery via its own power module.

[0092] In one possible implementation, the high-voltage battery control device 500 described above can be installed in a hybrid vehicle (not shown).

[0093] In one possible implementation, the high-voltage battery control device 500 described above can be installed in the HCU (not shown) of a hybrid vehicle.

[0094] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0095] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-voltage battery control method for a hybrid electric vehicle, applied to a hybrid power control unit (HCU), characterized in that, The high-voltage battery control method includes: When the main relay of the high-voltage battery of the hybrid vehicle is closed, if a predetermined condition is met, the drive motor of the hybrid vehicle is controlled to reach the first idle speed. Send a high-voltage disconnect command to the high-voltage battery to disconnect the main relay; Control the drive motor to reach a second idle speed, the second idle speed being higher than the first idle speed; and The drive motor is controlled to output a predetermined voltage for heating the high-voltage battery.

2. The high-voltage battery control method according to claim 1, characterized in that, The predetermined conditions include: A heating request is received for heating the high-voltage battery, and the charge of the high-voltage battery is less than or equal to a first calibration value.

3. The high-voltage battery control method according to claim 2, characterized in that, The predetermined conditions also include: The hybrid vehicle is stationary; and / or The permissible charging power of the high-voltage battery is less than or equal to the second calibration value.

4. The high-voltage battery control method according to any one of claims 1-3, characterized in that, After controlling the drive motor to reach a first idle speed, the high-voltage battery control method further includes: Check whether the PTC heating device used to heat the high-voltage battery is in normal working order; If the PTC heating device is detected to be in the normal state, a high-voltage disconnection command is sent to the high-voltage battery to disconnect the main relay.

5. The high-voltage battery control method according to any one of claims 1-3, characterized in that, Controlling the drive motor to output a predetermined voltage for heating the high-voltage battery includes: The drive motor is controlled so that it supplies the predetermined voltage to the PTC device used to heat the high-voltage battery via its own power module.

6. A high-voltage battery control device for a hybrid electric vehicle, characterized in that, The high-voltage battery control device includes: The first adjustment module is used to control the drive motor of the hybrid vehicle to reach a first idle speed if a predetermined condition is met when the main relay of the high-voltage battery of the hybrid vehicle is closed. The communication module is used to send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay; The second adjustment module is used to control the drive motor to achieve a second idle speed, which is higher than the first idle speed; and A control module is used to control the drive motor to output a predetermined voltage for heating the high-voltage battery.

7. The high-voltage battery control device according to claim 6, characterized in that, The predetermined conditions include: The high-voltage battery control device receives a heating request for heating the high-voltage battery, and the charge of the high-voltage battery is less than or equal to a first calibration value.

8. The high-voltage battery control device according to claim 7, characterized in that, The predetermined conditions also include: The hybrid vehicle is stationary; and / or The permissible charging power of the high-voltage battery is less than or equal to the second calibration value.

9. The high-voltage battery control device according to any one of claims 6-8, characterized in that, The first adjustment module is further configured to: after controlling the drive motor to reach a first idle speed, detect whether the PTC heating device for heating the high-voltage battery is in normal condition; The communication module is also configured to send a high-voltage disconnection command to the high-voltage battery to disconnect the main relay if the first adjustment module detects that the PTC heating device is in the normal state.

10. The high-voltage battery control device according to any one of claims 6-8, characterized in that, The control module is configured as follows: The drive motor is controlled so that it supplies the predetermined voltage to the PTC device used to heat the high-voltage battery via its own power module.

11. A hybrid electric vehicle, characterized in that, include: A high-voltage battery, a drive motor, and a high-voltage battery control device according to any one of claims 6-10.

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