Voltage regulation method, device and equipment of vehicle high-voltage bus, vehicle and medium
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAOMI EV TECH CO LTD
- Filing Date
- 2026-05-20
- Publication Date
- 2026-07-14
Smart Images
Figure CN122379293A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of vehicle technology, and in particular to a method, apparatus, equipment, vehicle, and medium for voltage regulation of a vehicle high-voltage bus. Background Technology
[0002] In 800V high-voltage electric vehicles, the battery voltage drops as the SOC (State of Charge) decreases, potentially failing to continuously meet the power supply demands of the 800V high-voltage bus. To maintain the high-voltage bus at the target voltage, vehicles are typically equipped with DC-DC (Direct Current to Direct Current) boost converters to actively boost the voltage when the battery voltage is insufficient, ensuring the high-voltage load can operate normally. However, this approach increases system complexity and cost. Summary of the Invention
[0003] The first aspect of this disclosure provides a voltage regulation method for a vehicle high-voltage bus. The vehicle's high-voltage system includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. The method includes: In response to the high voltage system completing the high voltage connection, the battery voltage of the power battery and the target voltage of the high voltage bus are obtained; Based on the battery voltage and the target voltage, the first semiconductor switch is controlled in a pulse width modulation manner, so that the DC converter composed of the first semiconductor switch, the diode, the inductor and the bus capacitor operates in the corresponding mode.
[0004] A second aspect of this disclosure provides a high-voltage system for a vehicle, comprising a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. The device includes: The acquisition module is used to acquire the battery voltage of the power battery and the target voltage of the high-voltage bus in response to the high-voltage system completing the high-voltage connection; The control module is used to control the first semiconductor switch in a pulse width modulation manner according to the battery voltage and the target voltage, so that the DC converter composed of the first semiconductor switch, the diode, the inductor and the bus capacitor operates in the corresponding mode.
[0005] A third aspect of this disclosure provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method described above.
[0006] A fourth aspect of this disclosure provides a vehicle whose high-voltage system includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. The vehicle further includes a processor and a memory for storing processor-executable instructions. The processor is configured to implement the above-described method.
[0007] The fifth aspect of this disclosure provides a non-transitory computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the method described above.
[0008] This disclosure discloses a method, apparatus, device, vehicle, and medium for regulating the voltage of a vehicle's high-voltage bus. The vehicle's high-voltage system includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. In response to the high-voltage system completing the high-voltage connection, the battery voltage of the power battery and the target voltage of the high-voltage bus are obtained. Based on the battery voltage and the target voltage, the first semiconductor switch is controlled using pulse width modulation, causing the DC-DC converter composed of the first semiconductor switch, diode, inductor, and bus capacitor to operate in the corresponding mode. This disclosure achieves dynamic regulation of the high-voltage bus voltage after the high-voltage system completes the high-voltage connection, eliminating the need for an additional dedicated DC-DC converter and effectively reducing system hardware complexity and cost.
[0009] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description
[0010] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of a vehicle high-voltage system provided in one embodiment of the present disclosure; Figure 2 A flowchart of a vehicle control method provided in one embodiment of this disclosure; Figure 3 This is a schematic diagram of a process for determining a target pre-charge current according to an embodiment of the present disclosure; Figure 4 A flowchart of a vehicle control method provided in another embodiment of this disclosure; Figure 5 A flowchart of active discharge provided in one embodiment of this disclosure; Figure 6 This is a block diagram of a vehicle safety detection device provided in one embodiment of the present disclosure; Figure 7 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present disclosure; Figure 8 This is a schematic diagram of the structure of a vehicle provided in one embodiment of the present disclosure. Detailed Implementation
[0011] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.
[0012] The vehicle control method, control device, electronic device, vehicle, and storage medium of the present disclosure are described below with reference to the accompanying drawings.
[0013] Figure 1 This is a schematic diagram of a vehicle high-voltage system provided in one embodiment of the present disclosure.
[0014] like Figure 1As shown, the high-voltage system of the vehicle in this embodiment includes: a first semiconductor switch SSR1, a power battery Bat, a diode D1, an inductor L11, a bus capacitor Cm, and a high-voltage bus. The anode of the diode D1 and the first terminal of the bus capacitor Cm are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode D1 and the first terminal of the inductor L11 are connected and then connected to the positive terminal of the power battery Bat through the first semiconductor switch SSR1. The negative terminal of the power battery Bat, the second terminal of the inductor L11, and the second terminal of the bus capacitor Cm are all connected to the negative terminal of the high-voltage bus.
[0015] like Figure 1 As shown, the high-voltage system of this embodiment further includes a second semiconductor switch SSR2 and a discharge switch K. The second semiconductor switch SSR2 is connected between the negative terminal of the power battery Bat and the negative terminal of the high-voltage bus, and the discharge switch K is connected between the positive terminal of the power battery Bat and the negative terminal of the high-voltage bus.
[0016] For example, both the first semiconductor switch SSR1 and the second semiconductor switch SSR2 are solid-state relays or electronic switches composed of power semiconductor devices such as MOSFETs and IGBTs.
[0017] like Figure 1 As shown, the high-voltage system of this embodiment further includes a measuring resistor shunt and a fuse, which are connected in series between the first semiconductor switch SSR1 and the positive terminal of the power battery. The measuring resistor shunt is used to measure the current flowing through the positive terminal of the high-voltage bus, and the fuse is used to disconnect the circuit in the event of a short circuit or severe overcurrent fault, providing hardware-level overcurrent protection to prevent device damage or thermal runaway risks.
[0018] Figure 2 This is a schematic flowchart illustrating a method for regulating the voltage of a vehicle high-voltage bus according to an embodiment of this disclosure.
[0019] It should be noted that the voltage regulation method for the vehicle high-voltage bus in this embodiment can be executed by a voltage regulation device for the vehicle high-voltage bus, which can be integrated into an electronic device, such as a vehicle controller, battery manager, or dedicated testing equipment. The electronic device includes, but is not limited to, a vehicle.
[0020] like Figure 2 As shown, the voltage regulation method for the vehicle high-voltage bus of this disclosure includes the following steps: S201, in response to the high voltage system completing the high voltage connection, obtains the battery voltage of the power battery and the target voltage of the high voltage bus.
[0021] For example, after the high-voltage system pre-charge is completed and the main circuit is established, the battery voltage Vbat of the power battery is obtained through the voltage sampling unit, and the target voltage of the high-voltage bus, such as 800, is determined according to the vehicle operating mode (such as driving, charging, energy recovery) or system control strategy. The target voltage of the high-voltage bus can be a fixed value or can be dynamically adjusted according to the load power demand, battery SOC, or thermal management status.
[0022] S202, based on the battery voltage and the target voltage, controls the first semiconductor switch in a pulse width modulation manner, so that the DC converter composed of the first semiconductor switch, diode, inductor and bus capacitor operates in the corresponding mode.
[0023] For example, when the battery voltage is detected to be lower than the target voltage, it is determined that boost operation is required. The vehicle controller controls the first semiconductor switch SSR1 to periodically turn on and off in a pulse width adjustment manner, so that the DC-DC converter operates in boost mode. When the battery voltage is detected to be equal to the target voltage, it is determined that there is no need to boost or buck the voltage. The vehicle controller controls the first semiconductor switch SSR1 to periodically turn on and off in a pulse width adjustment manner, so that the DC-DC converter works in a voltage regulation mode. If the battery voltage is detected to be greater than the target voltage, it is determined that a step-down is required. The vehicle controller controls the first semiconductor switch SSR1 to periodically turn on and off in a pulse width modulation manner, so that the DC-DC converter operates in step-down mode.
[0024] During the period when the first semiconductor switch SSR1 is turned on, the inductor L11 absorbs and stores energy from the power battery Bat. During the period when the first semiconductor switch SSR1 is turned off, the inductor L11 releases energy to the bus capacitor Cm through the diode.
[0025] Therefore, when the vehicle is parked or the high voltage is reduced, the first semiconductor switch SSR1 is completely disconnected, achieving reliable isolation of the high-voltage circuit. During vehicle operation, the first semiconductor switch SSR1, diode D1, and inductor L11 work together to form a non-isolated Buck-Boost power converter, dynamically boosting or bucking the battery voltage of the power battery to keep the high-voltage bus voltage on the load side stably maintained within the target range (e.g., 800V±30V). This eliminates the need for an additional dedicated DC-DC converter, effectively reducing system hardware complexity and cost. Through this voltage regulation mechanism, when the battery's SOC is low and the terminal voltage is insufficient, the voltage can be automatically boosted to ensure sufficient power supply to high-voltage loads such as the electric drive, improving the overall vehicle power performance. Conversely, when the battery's SOC is high and the battery voltage is too high, buck control is implemented to effectively suppress bus overvoltage, avoiding safety risks such as device breakdown and insulation failure caused by excessive voltage, thus balancing performance, efficiency, and high-voltage safety.
[0026] Furthermore, this disclosure, through dynamic boost or buck control of the battery voltage of the power battery (Bat), can maintain a stable high-voltage bus voltage across the entire range of battery state of charge (SOC) from 0% to 100%, meeting the requirements of electric drive and charging systems for a constant high-voltage platform. This relaxes the requirements for the operating voltage window of the power battery, further reducing the design and development costs of the battery system. For example, under high SOC conditions, the battery terminal voltage may exceed the system's rated upper limit. Active buck control can effectively suppress the risk of bus overvoltage, reduce the high-voltage safety risks of the entire vehicle, and enhance system robustness. As another example, under low SOC conditions, a drop in battery voltage can easily limit the output power of the electric drive system. Maintaining a stable bus voltage through boost control can ensure the electric drive system continuously outputs high performance, improving the vehicle's acceleration and dynamic response capabilities. Moreover, under low SOC conditions, the PTC heater's output power may decrease due to insufficient bus voltage, resulting in slow heating of the cabin or battery. This disclosure, by boosting the bus voltage, ensures that the PTC receives sufficient power across the entire SOC range, significantly improving the vehicle's thermal management efficiency and user experience.
[0027] Figure 3 This is a schematic flowchart illustrating a method for regulating the voltage of a vehicle high-voltage bus according to another embodiment of this disclosure.
[0028] like Figure 3 As shown, the voltage regulation method for the vehicle high-voltage bus of this disclosure embodiment further includes: S301, when the DC converter is operating in the corresponding mode, determines the voltage deviation between the bus voltage of the high-voltage bus and the target voltage.
[0029] For example, after the DC-DC converter has entered boost, buck, or regulated mode based on the battery voltage V_bat and the target voltage V_target, the bus voltage Vact of the high-voltage bus is obtained, and the voltage deviation between the bus voltage Vact and the target voltage V_target is calculated.
[0030] S302, determine the first target duty cycle of the first semiconductor switch based on the voltage deviation.
[0031] For example, within any control cycle, the duty cycle correction amount is determined based on the voltage deviation, and the duty cycle correction amount is added to the duty cycle of the previous control cycle to obtain the first target duty cycle of the current control cycle.
[0032] For example, the process of determining the duty cycle correction is as follows: The proportional correction is obtained by multiplying the voltage deviation by a preset proportional gain; the integral correction is obtained by integrating the voltage deviation and multiplying it by a preset integral gain; the proportional correction and the integral correction are added together to obtain the duty cycle correction. Finally, this duty cycle correction is superimposed on the duty cycle of the previous control cycle to generate the first target duty cycle of the current control cycle, which is used to generate a pulse width modulation signal to drive the first semiconductor switch SSR1.
[0033] S303 controls the turning on and off of the first semiconductor switch according to the pulse width modulation signal corresponding to the first target duty cycle.
[0034] For example, after obtaining the first target duty cycle of the current control cycle, a corresponding pulse width modulation signal is generated based on the first target duty cycle of the current control cycle, and this pulse width modulation signal is applied to the driving terminal of the first semiconductor switch SSR1 to periodically control its on and off states. Within one switching cycle: When the first semiconductor switch SSR1 is turned on, the power battery supplies power to the inductor through the first semiconductor switch SSR1, the inductor current rises, and the electrical energy is stored in the form of a magnetic field. When the first semiconductor switch SSR1 is turned off, the inductor L11 generates a reverse electromotive force, causing current to freewheel through diode D1 and charge the bus capacitor on the high-voltage bus side. It should be noted that the current direction of inductor L11 does not change abruptly when the first semiconductor switch SSR1 is turned off.
[0035] Therefore, by adjusting the duty cycle, this disclosure can control the ratio of inductor energy storage and release in each cycle, thereby precisely adjusting the bus voltage of the high-voltage bus to stably track the target voltage.
[0036] Figure 4 A flowchart of a vehicle control method provided in another embodiment of this disclosure.
[0037] like Figure 4The vehicle control method of this disclosure includes: S401 receives a request to apply high voltage and controls the high voltage system to apply high voltage.
[0038] S402, the high-voltage system has been detected to have completed the high-voltage connection.
[0039] S403 detects the battery voltage V_bat of the power battery and the target voltage V_target of the high-voltage bus.
[0040] S404, Determine if V_bat > V_target is true. If yes, proceed to step S405; otherwise, proceed to step S406.
[0041] The S405 DC-DC converter operates in buck mode to achieve voltage reduction.
[0042] S406, Determine if V_bat = V_target is true. If yes, proceed to step S407; otherwise, proceed to step S408.
[0043] The S407 DC-DC converter operates in voltage regulation mode to achieve voltage regulation.
[0044] The S408 DC-DC converter operates in boost mode to achieve voltage boost.
[0045] S409, in any operating mode, acquires the bus voltage Vact of the high-voltage bus and performs voltage closed-loop control based on the voltage deviation between the bus voltage Vact and the target voltage V_target.
[0046] S410 enables stable control of the bus voltage of the high-voltage bus. For example, Vact = V_target ± 20V.
[0047] In one embodiment of this disclosure, upon receiving a request for high voltage reduction from a vehicle, the bus capacitor needs to be actively discharged. The process of actively discharging the bus capacitor includes: Upon receiving a request for high voltage reduction from a vehicle, the system controls the second semiconductor switch SSR2 to open. While SSR2 is open, the system controls the discharge switch K to close. While K is closed, the system controls the first semiconductor switch SSR1 to turn on and off with a second target duty cycle to actively discharge the bus capacitor Cm. Specifically, if a vehicle collision event is detected, the second target duty cycle is determined to be the first set discharge duty cycle; if no collision event is detected, the second target duty cycle is determined to be the second set discharge duty cycle. The first set discharge duty cycle is greater than the second set discharge duty cycle.
[0048] During the active discharge of the bus capacitor Cm, if the temperature of the first semiconductor switch SSR1 is higher than the set temperature threshold, the second target duty cycle is reduced, and the first semiconductor switch SSR1 is turned on and off with the reduced target duty cycle to actively discharge the bus capacitor Cm until the bus voltage of the high voltage bus is detected to drop below the set voltage threshold, then the active discharge of the bus capacitor Cm is determined to be completed.
[0049] Therefore, this disclosure allows for the adjustment of the SSR1's duty cycle according to different discharge scenarios, effectively adjusting the discharge resistor's resistance value to achieve dynamic control of the active discharge rate and complete the corresponding energy discharge task. Simultaneously, real-time monitoring of the bus voltage and the temperature of the first semiconductor switch SSR1 during discharge enables timely termination of discharge when the voltage drops to a safe threshold and automatic reduction of the duty cycle to prevent thermal damage when the temperature is too high. This balances discharge speed and system reliability, effectively improving the safety, responsiveness, and device durability of the vehicle's high-voltage system. Furthermore, the semiconductor switch SSR in this embodiment can not only be used as an electronic switch but also as a controllable power converter—by configuring different PWM control strategies, the same hardware can dynamically perform multiple functions such as pre-charging, active discharging, and current regulation at different time periods, achieving high integration and multi-functional reuse.
[0050] Figure 5 This is a flowchart of active discharge provided for one embodiment of the present disclosure.
[0051] like Figure 5 As shown, the active discharge process of this embodiment includes the following steps: S501 received a request to reduce the high voltage.
[0052] S502, after the high-voltage condition is met, disconnect SSR2.
[0053] S503, Close discharge switch K.
[0054] S504, determine whether a collision event has occurred. If yes, proceed to step S505; if no, proceed to step S507.
[0055] S505, normal discharge mode.
[0056] S506, drive SSR1 according to the first set discharge duty cycle D1.
[0057] S507, Emergency Discharge Mode.
[0058] S508 drives SSR1 according to the second set discharge duty cycle D2.
[0059] S509, determine if the temperature of SSR1 exceeds the set temperature threshold. If yes, proceed to step S510; otherwise, proceed to step S511.
[0060] S510 reduces the duty cycle D of the second target, thereby reducing the discharge power.
[0061] S511, obtain the bus voltage V_Bus and determine whether the bus voltage V_Bus < 60V is true. If yes, proceed to step S512.
[0062] S512, active discharge complete, SSR1 disconnected.
[0063] In summary, the high-voltage system of the vehicle according to the embodiments of this disclosure includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. In response to the high-voltage system completing the high-voltage connection, the battery voltage of the power battery and the target voltage of the high-voltage bus are obtained. Based on the battery voltage and the target voltage, the first semiconductor switch is controlled using pulse width modulation, causing the DC-DC converter composed of the first semiconductor switch, diode, inductor, and bus capacitor to operate in the corresponding mode. This disclosure, by reusing the first semiconductor switch, diode, inductor, and bus capacitor to form the DC-DC converter, enables dynamic adjustment of the high-voltage bus voltage after the high-voltage system completes the high-voltage connection, eliminating the need for an additional dedicated DC-DC converter and effectively reducing system hardware complexity and cost.
[0064] Figure 6 This is a block diagram of a voltage regulation device for a vehicle high-voltage bus provided in one embodiment of the present disclosure.
[0065] like Figure 6 As shown, the voltage regulation device 600 for the vehicle high-voltage bus of this embodiment includes: an acquisition module 610 and a control module 620.
[0066] The acquisition module 610 is used to acquire the battery voltage of the power battery and the target voltage of the high-voltage bus in response to the high-voltage system completing the high-voltage connection. The control module 620 is used to control the first semiconductor switch in a pulse width modulation manner according to the battery voltage and the target voltage, so that the DC converter composed of the first semiconductor switch, diode, inductor and bus capacitor operates in the corresponding mode.
[0067] In some embodiments of this disclosure, the control module 620 includes: The first control unit is used to control the first semiconductor switch in a pulse width modulation manner in response to the battery voltage being lower than the target voltage, so that the DC-DC converter operates in boost mode. The second control unit is used to control the first semiconductor switch in pulse width modulation in response to the battery voltage being equal to the target voltage, so that the DC-DC converter operates in voltage regulation mode. The third control unit is used to control the first semiconductor switch in a pulse-width modulation manner in response to the battery voltage being greater than the target voltage, so that the DC-DC converter operates in buck mode.
[0068] In some embodiments of this disclosure, the above-described apparatus further includes: The first determining module is used to determine the voltage deviation between the bus voltage of the high-voltage bus and the target voltage when the DC converter is operating in the corresponding mode. The second determining module is used to determine the first target duty cycle of the first semiconductor switch based on the voltage deviation. The control module 620 is also used to control the conduction and cutoff of the first semiconductor switch according to the pulse width modulation signal corresponding to the first target duty cycle.
[0069] In some embodiments of this disclosure, when the control module 620 is used to control the on and off of the first semiconductor switch, it includes: During the conduction of the first semiconductor switch, the inductor absorbs and stores energy from the power battery; During the period when the first semiconductor switch is turned off, the inductor releases energy to the bus capacitor through the diode.
[0070] In some embodiments of this disclosure, the second determining module includes: The first determining subunit is used to determine the duty cycle correction amount based on the voltage deviation within any control cycle. The second determining subunit is used to add the duty cycle correction amount to the duty cycle of the previous control cycle to obtain the first target duty cycle of the current control cycle.
[0071] In some embodiments of this disclosure, when the first determining subunit is used to determine the duty cycle correction amount based on the voltage deviation, it includes: Based on the voltage deviation and the proportional gain, the proportional correction amount is determined, and based on the voltage deviation and the integral gain, the integral correction amount is determined. Finally, the proportional correction amount and the integral correction amount are added together to obtain the duty cycle correction amount.
[0072] In some embodiments of this disclosure, the control module 620 is further configured to: In response to receiving a request for high voltage reduction from the vehicle, the second semiconductor switch is disconnected. In response to the second semiconductor switch being in the open state, the discharge switch is controlled to close; In response to the discharge switch being in the closed state, the first semiconductor switch is turned on and off with the second target duty cycle to actively discharge the load capacitor. During the active discharge of the load capacitor, the active discharge of the load capacitor is determined to be complete when the bus voltage of the high-voltage bus is detected to drop below the set voltage threshold.
[0073] In some embodiments of this disclosure, determining the second target duty cycle includes at least one of the following: In response to the detection of a vehicle collision event, the second target duty cycle is determined to be the first preset discharge duty cycle; In response to the absence of a detected vehicle collision event, the second target duty cycle is determined to be the second set discharge duty cycle; The first set discharge duty cycle is greater than the second set discharge duty cycle.
[0074] In some embodiments of this disclosure, the above-described apparatus further includes: The adjustment module is used to reduce the second target duty cycle in response to the temperature of the first semiconductor switch being higher than a set temperature threshold during the active discharge of the load capacitor.
[0075] It should be noted that for details not disclosed in the voltage regulation device for the vehicle high-voltage bus in this embodiment, please refer to the details disclosed in the voltage regulation method for the vehicle high-voltage bus in this embodiment, which will not be repeated here.
[0076] According to the voltage regulation device for a vehicle high-voltage bus according to an embodiment of this disclosure, the high-voltage system of the vehicle includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. A module acquires the battery voltage of the power battery and the target voltage of the high-voltage bus in response to the high-voltage system completing the high-voltage connection. A control module controls the first semiconductor switch using pulse width modulation based on the battery voltage and the target voltage, causing the DC-DC converter composed of the first semiconductor switch, diode, inductor, and bus capacitor to operate in the corresponding mode. This disclosure achieves dynamic regulation of the high-voltage bus voltage after the high-voltage system completes the high-voltage connection, eliminating the need for an additional dedicated DC-DC converter and effectively reducing system hardware complexity and cost.
[0077] To implement the above embodiments, this disclosure also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the method as described in any of the foregoing embodiments.
[0078] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this disclosure. The electronic device 700 can be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, vehicle, etc.
[0079] Reference Figure 7 The electronic device 700 may include one or more of the following components: processing component 702, memory 704, power component 706, multimedia component 708, audio component 710, input / output (I / O) interface 712, sensor component 714, and communication component 716.
[0080] Processing component 702 typically controls the overall operation of electronic device 700, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 702 may include one or more processors 720 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 702 may include one or more modules to facilitate interaction between processing component 702 and other components. For example, processing component 702 may include a multimedia module to facilitate interaction between multimedia component 708 and processing component 702.
[0081] Memory 704 is configured to store various types of data to support the operation of electronic device 700. Examples of such data include instructions for any application or method operating on electronic device 700, contact data, phonebook data, messages, pictures, videos, etc. Memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.
[0082] Power component 706 provides power to the various components of electronic device 700. Power component 706 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 700.
[0083] Multimedia component 708 includes a screen that provides an output interface between the electronic device 700 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation.
[0084] Audio component 710 is configured to output and / or input audio signals. For example, audio component 710 includes a microphone (MIC) configured to receive external audio signals when electronic device 700 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 704 or transmitted via communication component 716. In some embodiments, audio component 710 also includes a speaker for outputting audio signals.
[0085] I / O interface 712 provides an interface between processing component 702 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.
[0086] Sensor assembly 714 includes one or more sensors for providing status assessments of various aspects of electronic device 700. For example, sensor assembly 714 can detect the on / off state of electronic device 700, the relative positioning of components such as the display and keypad of electronic device 700, changes in the position of electronic device 700 or a component of electronic device 700, the presence or absence of user contact with electronic device 700, the orientation or acceleration / deceleration of electronic device 700, and temperature changes of electronic device 700.
[0087] Communication component 716 is configured to facilitate wired or wireless communication between electronic device 700 and other devices. Electronic device 700 can access wireless networks based on communication standards, such as WiFi (Wireless Fidelity), 4G (Fourth Generation), or 5G (Fifth Generation), or combinations thereof. In one exemplary embodiment, communication component 716 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel.
[0088] In an exemplary embodiment, the electronic device 700 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.
[0089] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 704 including instructions, which can be executed by a processor 720 of an electronic device 700 to perform the above-described method. For example, the computer-readable storage medium may be a read-only memory, a random access memory, a read-only optical disk, a magnetic tape, a floppy disk, and an optical data storage device, etc.
[0090] To implement the above embodiments, this disclosure also proposes a vehicle, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the method as described in any of the foregoing embodiments.
[0091] Figure 8 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this disclosure. For example, vehicle 800 can be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles.
[0092] Reference Figure 8 The vehicle 800 may include various subsystems, such as an infotainment system 810, a perception system 820, a decision control system 830, a drive system 840, and a computing platform 850. The vehicle 800 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of the vehicle 800 can be interconnected via wired or wireless means.
[0093] In some embodiments, the infotainment system 810 may include a communication system, an entertainment system, etc.
[0094] The perception system 820 may include several sensors for sensing information about the environment surrounding the vehicle 800. For example, the perception system 820 may include a global positioning system (which may be GPS, BeiDou, or other positioning systems), an inertial measurement unit (IMU), lidar, millimeter-wave radar, ultrasonic radar, and a camera device.
[0095] The decision control system 830 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.
[0096] The drive system 840 may include components that provide powered motion to the vehicle 800. In one embodiment, the drive system 840 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy.
[0097] Some or all of the functions of the vehicle 800 are controlled by a computing platform 850. The computing platform 850 may include at least one processor 851 and a memory 852, the processor 851 being able to execute instructions 853 stored in the memory 852.
[0098] Processor 851 can be any conventional processor, such as a central processing unit (CPU). Processors may also include graphics processing units (GPUs), field-programmable gate arrays (FPGAs), systems-on-chips (SoCs), application-specific integrated circuits (ASICs), or combinations thereof.
[0099] The memory 852 can be implemented by any type of volatile or non-volatile storage device or a combination thereof.
[0100] In addition to instruction set 853, memory 852 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 852 can be used by computing platform 850.
[0101] In this embodiment of the disclosure, processor 851 may execute instructions 853 to complete all or part of the steps of the above-described method embodiments.
[0102] To implement the above embodiments, this disclosure also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any of the foregoing method embodiments.
[0103] To implement the above embodiments, this disclosure also proposes a computer program product having a computer program stored thereon, which, when executed by a processor, implements the method described in any of the foregoing method embodiments.
[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0105] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0106] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.
[0107] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.
[0108] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0109] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
[0110] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0111] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.
Claims
1. A method for regulating the voltage of a vehicle's high-voltage bus, characterized in that, The vehicle's high-voltage system includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. The method includes: In response to the high voltage system completing the high voltage connection, the battery voltage of the power battery and the target voltage of the high voltage bus are obtained; Based on the battery voltage and the target voltage, the first semiconductor switch is controlled in a pulse width modulation manner, so that the DC converter composed of the first semiconductor switch, the diode, the inductor and the bus capacitor operates in the corresponding mode.
2. The method according to claim 1, characterized in that, The step of controlling the first semiconductor switch in a pulse-width modulation manner according to the battery voltage and the target voltage, so that the DC-DC converter composed of the first semiconductor switch, the diode, the inductor and the bus capacitor operates in a corresponding mode, includes: In response to the battery voltage being less than the target voltage, the first semiconductor switch is controlled by pulse width modulation to make the DC-DC converter operate in boost mode; In response to the battery voltage being equal to the target voltage, the first semiconductor switch is controlled in a pulse width modulation manner to make the DC-DC converter operate in a voltage regulation mode; In response to the battery voltage being greater than the target voltage, the first semiconductor switch is controlled by pulse width modulation to enable the DC-DC converter to operate in buck mode.
3. The method according to claim 1 or 2, characterized in that, The method further includes: When the DC-DC converter is operating in the corresponding mode, the voltage deviation between the bus voltage of the high-voltage bus and the target voltage is determined. Based on the voltage deviation, determine the first target duty cycle of the first semiconductor switch; The first semiconductor switch is controlled to turn on and off based on the pulse width modulation signal corresponding to the first target duty cycle.
4. The method according to claim 3, characterized in that, The control of turning the first semiconductor switch on and off includes: During the conduction of the first semiconductor switch, the inductor absorbs and stores energy from the power battery; During the period when the first semiconductor switch is off, the inductor releases energy to the bus capacitor via the diode.
5. The method according to claim 3, characterized in that, Determining the first target duty cycle of the first semiconductor switch based on the voltage deviation includes: Within any control cycle, the duty cycle correction amount is determined based on the voltage deviation; The duty cycle correction amount is added to the duty cycle of the previous control cycle to obtain the first target duty cycle of the current control cycle.
6. The method according to claim 5, characterized in that, The step of determining the duty cycle correction amount based on the voltage deviation includes: The proportional correction amount is determined based on the voltage deviation and the proportional gain. The integral correction amount is determined based on the voltage deviation and the integral gain. The duty cycle correction is obtained by adding the proportional correction to the integral correction.
7. The method according to claim 1, characterized in that, The high-voltage system further includes a second semiconductor switch and a discharge switch. The second semiconductor switch is connected between the negative terminal of the power battery and the negative terminal of the high-voltage bus, and the discharge switch is connected between the positive terminal of the power battery and the negative terminal of the high-voltage bus. The method further includes: In response to receiving a request for high voltage reduction from the vehicle, the second semiconductor switch is controlled to disconnect. In response to the second semiconductor switch being in the open state, the discharge switch is controlled to close; In response to the discharge switch being in a closed state, the first semiconductor switch is controlled to turn on and off with a second target duty cycle to actively discharge the load capacitor; During the active discharge of the load capacitor, in response to the detection that the bus voltage of the high-voltage bus has dropped below a set voltage threshold, it is determined that the active discharge of the load capacitor has been completed.
8. The method according to claim 7, characterized in that, The determination of the second target duty cycle includes at least one of the following: In response to the detection of a collision event involving the vehicle, the second target duty cycle is determined to be the first preset discharge duty cycle; In response to the absence of a detected collision event involving the vehicle, the second target duty cycle is determined to be the second preset discharge duty cycle; Wherein, the first set discharge duty cycle is greater than the second set discharge duty cycle.
9. The method according to claim 7, characterized in that, The method further includes: During the active discharge of the load capacitor, in response to the temperature of the first semiconductor switch being higher than a set temperature threshold, the second target duty cycle is reduced.
10. A voltage regulating device for a vehicle high-voltage busbar, characterized in that, The vehicle's high-voltage system includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery via the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. The device includes: The acquisition module is used to acquire the battery voltage of the power battery and the target voltage of the high-voltage bus in response to the high-voltage system completing the high-voltage connection; The control module is used to control the first semiconductor switch in a pulse width modulation manner according to the battery voltage and the target voltage, so that the DC converter composed of the first semiconductor switch, the diode, the inductor and the bus capacitor operates in the corresponding mode.
11. The apparatus according to claim 10, characterized in that, The control module includes: A first control unit is configured to control the first semiconductor switch in a pulse-width modulation manner in response to the battery voltage being less than the target voltage, so that the DC-DC converter operates in boost mode. The second control unit is configured to control the first semiconductor switch in a pulse-width modulation manner in response to the battery voltage being equal to the target voltage, so that the DC-DC converter operates in a voltage regulation mode. The third control unit is used to control the first semiconductor switch in a pulse width modulation manner in response to the battery voltage being greater than the target voltage, so that the DC-DC converter operates in buck mode.
12. An electronic device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the voltage regulation method for the high-voltage bus of a vehicle as described in any one of claims 1-9.
13. A vehicle, characterized in that, The vehicle's high-voltage system includes a first semiconductor switch, a power battery, a diode, an inductor, a bus capacitor, and a high-voltage bus. The anode of the diode and the first terminal of the bus capacitor are respectively connected to the positive terminal of the high-voltage bus. The cathode of the diode and the first terminal of the inductor are connected and then connected to the positive terminal of the power battery through the first semiconductor switch. The negative terminal of the power battery, the second terminal of the inductor, and the second terminal of the bus capacitor are all connected to the negative terminal of the high-voltage bus. The vehicle also includes: processor; Memory used to store processor-executable instructions; The processor is configured as follows: The method for regulating the voltage of the vehicle high-voltage bus as described in any one of claims 1-9.
14. A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor, enable the processor to perform a voltage regulation method for a vehicle high-voltage bus as described in any one of claims 1-9.