Method and system for dynamically adjusting DCDC power supply of new energy automobile

Abstract

The invention discloses a method and a system for dynamically adjusting a DCDC power supply of a new energy automobile, and relates to the technical field of power supply adjustment. The method comprises the steps of establishing a time reference consistent with a control period, synchronously collecting and updating a sliding window, performing window preprocessing and working condition recognition, generating comprehensive scheduling parameters, performing parameter layer adjustment based on the comprehensive scheduling parameters, performing vehicle type level parameter centralized management and online correction, performing abnormal trigger protection, performing grading derating and performing safety disposal. Through unification of time marks and complete sets of data, lightweight scheduling parameter driving, segmented compensation penetration and threshold hysteresis control, sudden change response acceleration, cross-temperature zone consistency improvement, stability and thermal safety collaboration and reduction of mass production operation and maintenance cost are realized.

Description

Technical Field

[0001] This invention relates to the field of power supply regulation technology, specifically to a method and system for dynamic regulation of DC-DC power supply in new energy vehicles. Background Technology

[0002] The on-board DC power converter in new energy vehicles is located between the high-voltage battery and the low-voltage power network, undertaking the tasks of stabilizing and supplying power to critical loads. In actual operation, vehicles frequently experience start-stop, rapid acceleration, regenerative braking, and periodic engagement and disengagement of electrical accessories, resulting in rapid changes and uncertainties on the load side. Simultaneously, the external ambient temperature and the internal temperature of the devices vary greatly under conditions such as cold start, prolonged high load, altitude, and seasonal changes, leading to sensor drift, temperature-dependent device parameter shifts, and thermal hysteresis. Traditional solutions often rely on simple feedforward with fixed-parameter voltage outer loop and current inner loop, which is prone to overshoot, secondary backtracking, and excessively long recovery times during transient phases. Regarding temperature compensation, common segmented corrections tend to produce discontinuities or abrupt slope changes at segment boundaries, resulting in insufficient consistency across temperature zones. In terms of stability and thermal safety management, current limiting and reference rate of change control are often independent of loop damping adjustments, failing to make coordinated decisions when multiple risks such as phase degradation, load oscillation, and thermal margin convergence occur simultaneously, leading to delayed or excessive derating. Furthermore, existing methods generally lack synchronous sampling and sliding window mechanisms that are strictly aligned with the control cycle, resulting in insufficient data completeness, time consistency, and anomaly traceability, which further affects the accuracy of operating condition identification and parameter scheduling. Parameter management for mass production of multiple vehicle models is also relatively fragmented, with window length, weight, threshold, and correction coefficients difficult to be uniformly controlled and gradually released at the vehicle level. The ability to roll back and audit online adjustments is limited, increasing operational risks.

[0003] Based on the above situation, there is an urgent need for a method that, without changing the basic control topology, can use sampling and windows consistent with the control cycle as the data base, set lightweight but quantifiable scheduling parameters for the three key contradictions of sudden change responsiveness, temperature-induced continuity, and stability derating coordination, and achieve coordinated responses of feedforward, proportional, integral, and derivative through parameter layer adjustment, while realizing the continuity correction of the starting point and slope and smooth transition of segment boundaries in temperature segment compensation; in order to ensure stability, consistency, and safety under complex operating conditions and the entire life cycle. Summary of the Invention

[0004] Based on the shortcomings of the prior art described above, the purpose of this invention is to provide a dynamic adjustment method and system for DC-DC power supply in new energy vehicles to solve the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for dynamic adjustment of DC-DC power supply in new energy vehicles, comprising: S1: Establish a time reference consistent with the control cycle, synchronously collect output voltage, output current, battery side voltage, vehicle operating conditions and ambient temperature, and update the sliding window according to the control cycle; S2: Preprocess and identify the operating conditions of the data within the sliding window, and generate a set of comprehensive scheduling parameters for drive control within the same sliding window. The comprehensive scheduling parameters include at least the impulse follower, the temperature hysteresis flow, and the stability drop risk. The impulse follower is used to characterize the intensity of the sudden change and the energy flow direction, the temperature hysteresis flow is used to characterize the temperature hysteresis and thermal hysteresis, and the stability drop risk is used to characterize the stability risk and thermal safety margin. S3: While maintaining the basic control structure of the voltage outer loop and current inner loop unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient servo adjustment of feedforward, proportional, integral and derivative functions according to impulse servo momentum; correction of the starting point, slope and segment boundary transition of temperature segment compensation according to temperature hysteresis continuity; and coordinated stability and derating control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk. S4: Centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; S5: When undervoltage, overvoltage, overcurrent, temperature exceeding the limit, or timing abnormality occurs, protection and derating strategies are executed first, the dynamic scheduling of integrated scheduling parameters is frozen, and the process enters the safety handling procedure.

[0006] The present invention is further configured such that, in S1, a unified time scale consistent with the control cycle is established using the vehicle-side master clock, and the output voltage, output current, battery-side voltage, vehicle operating parameters and ambient temperature are synchronously sampled at the unified trigger edge of each control cycle. The window length is a preset number of control cycles, and the sampling frequency is greater than or equal to 1kHz.

[0007] The present invention is further configured such that, in S2, the data within the sliding window is preprocessed and the operating condition is identified, including: Perform a completeness check on the data for each control cycle within the window. If any channel is missing for a single time, the most recent valid value will be used as a short-term replacement and a replacement mark will be added. Amplitude limiting and de-glitching are performed on the data of each channel, and time alignment between channels is completed. The ambient temperature of the low-speed quantity is aligned with that of the high-speed quantity using either hold or slight interpolation. Perform physical consistency checks, including at least the basic constraints of voltage, current and power relationships, and mark samples that do not meet the consistency requirements as abnormal and exclude them; A sudden change judgment threshold is set based on the change amplitude of the output current and the equivalent index on the load side between adjacent samples. Combined with the rising or falling direction of the battery side voltage, it is identified as acceleration, regeneration or start-stop conversion. When the change amplitude is continuously lower than the threshold and the duration reaches the set value, it is identified as steady state, and the operating condition label and intensity level are output.

[0008] The present invention is further configured such that, in S2, the impulse-momentum is synthesized by the maximum adjacent change amplitude of the output current within the window and the maximum adjacent change amplitude of the equivalent index on the load side according to a preset ratio. The thermal hysteresis throughput is a composite of the hysteresis quantity, which is the difference between the estimated internal temperature of the device and the external temperature, calculated from the average power consumption and the external temperature within the window, and the thermal hysteresis quantity characterized by the sample distance between the heating path and the cooling path at a fixed error threshold, according to a preset ratio. The risk of stabilization is synthesized by the phase degradation indicator obtained from the sequential relationship between the peak voltage ripple and the peak current ripple, the backlash measure obtained from the amplitude ratio of the second peak to the first peak of the same step response, and the thermal margin measure obtained from the safety belt of the internal temperature relative to the upper limit of the thermal limit, according to a preset ratio.

[0009] The present invention is further configured to perform transient follower adjustment of feedforward, proportional, integral, and derivative parameters based on the impulse follower momentum, including: In each control cycle, the impulse follower momentum is read and divided into three levels: low, medium and high according to the preset upper and lower thresholds. Entry and exit must meet the minimum duration and adopt upper and lower hysteresis. Increase the advance compensation of the feedforward branch proportionally according to the gear and set the maximum increment limit and the change slope limit; The proportional channel is raised in small steps according to the gear, with limits on the upper limit and the maximum change in a single cycle; In the intermediate and high gears, the integral channel output is compressed and the integral accumulation is limited. After exiting, it is discharged and restored at a fixed slope. Temporarily increase the differential damping at the higher settings, while maintaining the nominal or slightly increased damping at the lower and intermediate settings; The effective quantity of each channel is output after the target quantity of the gear is limited and ramped; When the impulse falls back to below the release threshold with the momentum and remains at the minimum duration, the feedforward and proportional revert to the nominal value with a fixed slope, the integral recovers with a fixed slope, and the derivative retracts in a predetermined order. If any gear is triggered again during the recovery process, the recovery will be aborted and the new gear will be executed.

[0010] The present invention is further configured to perform continuity correction on the starting point, slope, and segment boundary transition of temperature segment compensation based on the temperature hysteresis continuity, including: The ambient temperature is divided into multiple calibration temperature ranges and a transition zone is set between adjacent temperature ranges. Each range includes a starting point and slope compensation parameters. A small correction is made to the starting point of the temperature range based on the temperature hysteresis throughput. The correction amount has an upper limit and a minimum step size and changes monotonically with the temperature hysteresis throughput. When the temperature hysteresis throughput drops below the release threshold, it reverts to the nominal value with a fixed slope. Without changing the basic trend of segmentation, the slope of the temperature segment is slightly modified according to the temperature hysteresis penetration amount. The amount of modification is limited within the segment and restricted in a single cycle. Within the transition zone, a two-segment weighted smoothing method is used for the starting point and slope. The weights change continuously with temperature displacement within the transition zone, resulting in segment boundaries without steps or sharp angles. When the temperature hysteresis throughput exceeds the safety threshold, the temperature-related compensation rate of change is temporarily reduced and a freeze window is set. The freeze is lifted after the temperature drops back below the threshold and remains within the minimum duration.

[0011] The present invention is further configured to perform coordinated stability and derating control on current limiting and reference change rates according to graded thresholds based on the stabilization and derating risk level, including: The risk level is divided into three levels: normal, alarm and restricted. Upward and downward thresholds are set and upward and downward hysteresis and minimum holding time are adopted. In the normal level, the nominal current limit and reference rate of change limit are maintained. In the alarm level, the proportional channel gain is reduced, the derivative damping is increased, and the current limit upper limit and reference rate of change limit are tightened. All changes are performed on a ramp basis. In the limit level, the current limit upper limit and reference rate of change limit are further tightened and an alarm record is generated. The proportional and derivative channels converge to a conservative configuration within a safe range. Uplink handover takes effect immediately after being determined by the high threshold and enters a hold window. No rollback is triggered within the hold window. Downlink handover must meet the low threshold and minimum holding time. All restricted quantities are rolled back on a ramp basis.

[0012] The present invention is further configured such that, in S4, a parameter template library is established, and hierarchical management is carried out according to vehicle platform, hardware version, software version, ambient temperature zone and working condition type. All parameters are centrally stored and managed using immutable versions. Online correction includes preparation, replay verification, experimental verification, gray-scale release, full implementation, and observation and convergence. In the preparation stage, upper and lower bounds, minimum step size, and maximum change in a single period are set for parameters. Replay verification is based on the threshold of key indicators from multiple recent windows. Experimental verification observes key indicators within a limited time and sets the maximum allowable risk level. Gray-scale release takes effect gradually by region, vehicle series, batch, or proportion and is recorded throughout. Full implementation is uniformly switched at the control cycle boundary and the actual configuration results are transmitted back. In the observation and convergence stage, small-step fine-tuning is allowed and the adjustment range is automatically reduced when entering the alarm zone.

[0013] The present invention is further configured such that, in S5, a threshold, hysteresis, and minimum duration are set for the anomaly, and the event is determined to be valid if the conditions are met. When multiple anomalies occur concurrently, they should be handled in the following order of priority: overcurrent, overvoltage, temperature exceeding limit, undervoltage, and timing anomalies. Upon triggering a valid event, the dynamic scheduling of the integrated scheduling parameters is immediately frozen, the feedforward is cleared and increments are prohibited, the proportional, integral and derivative parameters are rolled back to the safe level, the integral enters the discharge state, the temperature segment compensation is frozen at the current segment value, and the start time of the freeze and the event type are recorded; the current limit is reduced according to the alarm level and the limit level, the current limit upper limit is lowered and the reference change rate limit is tightened and the damping is increased, the current limit upper limit and the reference change rate limit are reduced, the level can only be upgraded from low to high, and the rollback must meet the recovery conditions and hysteresis time.

[0014] This invention also provides a dynamic adjustment system for DC-DC power supply in new energy vehicles, used to implement the above-mentioned dynamic adjustment method for DC-DC power supply in new energy vehicles, comprising: Data acquisition module: Establishes a time base consistent with the control cycle, synchronously collects output voltage, output current, battery side voltage, vehicle operating conditions and ambient temperature, and updates the sliding window according to the control cycle; Parameter generation module: preprocesses and identifies the operating conditions of the data within the sliding window, and generates a set of comprehensive scheduling parameters for drive control within the same sliding window. The comprehensive scheduling parameters include at least impulse follower, temperature hysteresis penetration and stability risk. Among them, impulse follower is used to characterize the intensity of the sudden change and the energy flow direction, temperature hysteresis penetration is used to characterize temperature hysteresis and thermal hysteresis, and stability risk is used to characterize stability risk and thermal safety margin. Parameter adjustment module: While maintaining the basic control structure of the voltage outer loop and current inner loop unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient servo adjustment of feedforward, proportional, integral and derivative functions according to impulse servo momentum; correction of the starting point, slope and segment boundary transition of temperature segment compensation according to temperature hysteresis continuity; and coordinated stability and derating control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk. Management and correction module: performs centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; Anomaly Handling Module: When undervoltage, overvoltage, overcurrent, temperature exceeding limits, or timing anomalies occur, protection and derating strategies are executed first, dynamic scheduling of integrated scheduling parameters is frozen, and the system enters the safety handling process.

[0015] This invention provides a method and system for dynamic adjustment of DC-DC power supply in new energy vehicles. The method establishes a time reference consistent with the control cycle, synchronously collects output voltage, output current, battery-side voltage, vehicle operating parameters, and ambient temperature, and updates the sliding window according to the control cycle. It preprocesses and identifies the operating conditions within the sliding window, generating a comprehensive scheduling parameter set for drive control within the same sliding window. The comprehensive scheduling parameters include at least impulse follow-up, thermal hysteresis, and stability sag risk. Impulse follow-up characterizes the intensity of sudden changes and energy flow, thermal hysteresis characterizes temperature hysteresis and thermal hysteresis return, and stability sag risk characterizes stability risk and thermal safety margin. While maintaining voltage... Under the premise that the basic control structure of the outer loop and the inner current loop remains unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient follow-up adjustment of feedforward, proportional, integral, and derivative parameters according to impulse follow-up momentum; through-correction of the starting point, slope, and segment boundary transition of temperature segment compensation according to temperature hysteresis through-compensation; stability and derating coordinated control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk; centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; when undervoltage, overvoltage, overcurrent, temperature exceeding limit, or timing abnormality occurs, protection and derating strategies are prioritized, the dynamic scheduling of comprehensive scheduling parameters is frozen, and a safety handling process is initiated. The beneficial effects include: 1. Faster and more stable transient response: Through the coordinated adjustment of feedforward, proportional, integral and derivative driven by impulse change and momentum, the rise and recovery process is significantly shortened under sudden operating conditions such as acceleration, regeneration and start-stop, reducing overshoot and secondary peak, and improving output following and reproducibility. 2. Better consistency across temperature zones: The starting point and slope of temperature segment compensation are finely adjusted online in small steps by using the temperature hysteresis throughput, and a smooth transition is set at the segment boundary to effectively avoid the steps and abrupt slope changes caused by segment splicing, and reduce static error and jitter in the temperature scanning process. 3. More reasonable coordination between stability and rate reduction: The risk reduction measure unifies phase degradation, foldback trend and thermal margin into a single risk value. Combined with graded thresholds and upper and lower hysteresis, it realizes the linkage control of proportional and differential self-tuning and current limiting and reference change rate, avoiding lag or over-action, and suppressing oscillation and repeated switching. 4. Zero intrusion into the basic control topology: Without changing the structure of the voltage outer loop and the current inner loop, scheduling and compensation are superimposed in the parameter layer, resulting in low migration costs, controllable impact on the stability margin of existing control loops, and easy mass production deployment.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 A flowchart illustrating a dynamic adjustment method for DC-DC power supply in a new energy vehicle, as shown in an exemplary embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the structure of a dynamic adjustment system for DC-DC power supply in a new energy vehicle, as shown in an exemplary embodiment of the present invention. Detailed Implementation

[0018] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0021] Example 1: A method for dynamic adjustment of DC-DC power supply in new energy vehicles, such as Figure 1 As shown, it includes: S1: Establish a time reference consistent with the control cycle, synchronously collect output voltage, output current, battery side voltage, vehicle operating conditions and ambient temperature, and update the sliding window according to the control cycle; S2: Preprocess and identify the operating conditions of the data within the sliding window, and generate a set of comprehensive scheduling parameters for drive control within the same sliding window. The comprehensive scheduling parameters include at least the impulse follower, the temperature hysteresis flow, and the stability drop risk. The impulse follower is used to characterize the intensity of the sudden change and the energy flow direction, the temperature hysteresis flow is used to characterize the temperature hysteresis and thermal hysteresis, and the stability drop risk is used to characterize the stability risk and thermal safety margin. S3: While maintaining the basic control structure of the voltage outer loop and current inner loop unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient servo adjustment of feedforward, proportional, integral and derivative functions according to impulse servo momentum; correction of the starting point, slope and segment boundary transition of temperature segment compensation according to temperature hysteresis continuity; and coordinated stability and derating control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk. S4: Centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; S5: When undervoltage, overvoltage, overcurrent, temperature exceeding the limit, or timing abnormality occurs, protection and derating strategies are executed first, the dynamic scheduling of integrated scheduling parameters is frozen, and the process enters the safety handling procedure.

[0022] The present invention is further configured such that, in S1, a unified time scale consistent with the control cycle is established using the vehicle-side master clock, and the output voltage, output current, battery-side voltage, vehicle operating parameters and ambient temperature are synchronously sampled at the unified trigger edge of each control cycle. The window length is a preset number of control cycles, and the sampling frequency is greater than or equal to 1kHz.

[0023] Specifically, a unified timescale consistent with the control cycle is established using the vehicle-side master clock, enabling control calculations and data acquisition to run on the same time scale, avoiding timing drift and phase uncertainty caused by asynchronous acquisition and control. Subsequently, at the same trigger edge of each control cycle, output voltage, output current, battery-side voltage, vehicle operating conditions, and ambient temperature are sampled simultaneously, ensuring that each signal within the same cycle has comparable and strictly aligned time stamps, avoiding spurious correlations and misjudgments caused by sequential sampling, thereby improving the reliability of subsequent feature extraction and operating condition identification. The sliding window has a preset number of control cycles as its length and is updated at the boundary of each control cycle. This allows for rolling coverage of recent data and natural elimination of older data, making parameter estimation both real-time and noise-resistant. Aligning the window boundary with the control cycle boundary allows statistics, threshold determination, and scheduling actions to be completed within a fixed timeframe, forming a deterministic computational sequence and predictable resource usage. With a sampling frequency of at least 1,000 times per second, it can distinguish rapid changes such as vehicle start-stop, acceleration, and regeneration at the millisecond level, and provides sufficient effective samples within a single control cycle. This satisfies the need to characterize jumps and ripples, and provides high-quality, complete, and in-phase basic data for subsequent calculations of impulse-momentum, temperature hysteresis, and stability risk.

[0024] The present invention is further configured such that, in S2, the data within the sliding window is preprocessed and the operating condition is identified, including: Perform a completeness check on the data for each control cycle within the window. If any channel is missing for a single time, the most recent valid value will be used as a short-term replacement and a replacement mark will be added. Amplitude limiting and de-glitching are performed on the data of each channel, and time alignment between channels is completed. The ambient temperature of the low-speed quantity is maintained or slightly interpolated to align with the high-speed quantity. Perform physical consistency checks, including at least the basic constraints of voltage, current and power relationships, and mark samples that do not meet the consistency requirements as abnormal and exclude them; A sudden change judgment threshold is set based on the change amplitude of the output current and the equivalent index on the load side between adjacent samples. Combined with the rising or falling direction of the battery side voltage, it is identified as acceleration, regeneration or start-stop conversion. When the change amplitude is continuously lower than the threshold and the duration reaches the set value, it is identified as steady state, and the operating condition label and intensity level are output.

[0025] Specifically, a reliable data base is first established within a sliding window aligned with the control cycle, and then reliable operating condition determinations are made based on this base. To this end, the data entering the window undergoes a homogeneity check to ensure that all channels are collected simultaneously within the same cycle and can correspond to each other. When a single missing value occurs, the most recent valid value is used as a short-term substitute to maintain sequence continuity and avoid computational interruptions caused by individual sample loss. Simultaneously, the substitute sample is labeled to facilitate differentiation in subsequent algorithms when calculating weights or confidence levels, thus ensuring both continuity and risk avoidance. Under the premise of acceptable data quality, amplitude limiting and glitch removal are performed on each channel to suppress spurious signals such as instantaneous spikes, saturation bounces, and electromagnetic interference, preventing these anomalies from being amplified under differential or extremum operators. Since there are inherent time delays in the sampling responses and transmission paths of different channels, time alignment between channels ensures that all quantities strictly correspond to the same period boundary, guaranteeing comparability. Low-speed quantities such as ambient temperature differ from high-speed voltage and current in time resolution; alignment with high-speed quantities using hold-or slight interpolation balances signal smoothness and timing consistency, avoiding spurious correlations caused by misalignment. After timing and quality shaping are completed, a physical consistency check is performed. Based on the fundamental constraints between voltage, current and power, samples that clearly violate energy conservation or directional relationships are marked as abnormal and removed. This can promptly detect hardware or cable problems such as sensor drift, reverse polarity, and range out-of-bounds, preventing abnormal samples from participating in subsequent threshold determination and parameter synthesis and contaminating the results. Based on clean and aligned data, operating condition identification is then performed. The magnitude of adjacent sample changes in output current and equivalent load-side parameters is used as a measure of abrupt changes. Upward and downward thresholds are set, along with minimum durations, to sensitively capture rapid edges of acceleration, regeneration, and start-stop transitions while suppressing noise-induced jitter. Combining the rising or falling direction of battery-side voltage effectively distinguishes between traction-side injection and regeneration-side absorption, preventing the conflation of different energy flows. When the change magnitude remains below the threshold for a period of time, it is considered a steady state, providing a stable window for subsequent parameter tuning and online correction. Finally, operating condition labels and intensity levels are output.

[0026] The present invention is further configured such that, in S2, the impulse-momentum is synthesized by the maximum adjacent change amplitude of the output current within the window and the maximum adjacent change amplitude of the equivalent index on the load side according to a preset ratio. The thermal hysteresis throughput is a composite of the hysteresis quantity, which is the difference between the estimated internal temperature of the device and the external temperature, calculated from the average power consumption and the external temperature within the window, and the thermal hysteresis quantity characterized by the sample distance between the heating path and the cooling path at a fixed error threshold, according to a preset ratio. The risk of stabilization is synthesized by the phase degradation indicator obtained from the sequential relationship between the peak voltage ripple and the peak current ripple, the backlash measure obtained from the amplitude ratio of the second peak to the first peak of the same step response, and the thermal margin measure obtained from the safety belt of the internal temperature relative to the upper limit of the thermal limit, according to a preset ratio.

[0027] Specifically, the principle of impulse servo momentum is based on a sliding window aligned with the control cycle. It extracts the maximum variation amplitude of adjacent samples of the output current within the window, and simultaneously extracts the maximum variation amplitude of adjacent samples of the equivalent load-side index. The former directly reflects the jump intensity at the power output end, while the latter characterizes the load mutation characteristics on the vehicle's drive side or power consumption side. By combining the two according to a preset ratio, information from both the power supply side and the load side can be considered in a single index. This improves sensitivity to rapid operating conditions such as acceleration, regeneration, and start-stop, while reducing the probability of misjudgment caused by single-channel noise or occasional spikes. It provides a stable and quantifiable trigger quantity for transient servoing of feedforward, proportional, integral, and derivative functions. The principle of thermal hysteresis throughput lies in comprehensively evaluating the response hysteresis of the device's internal temperature to the external temperature and the hysteresis characteristics of the temperature change path. First, the approximate value of the device's internal temperature is calculated using the average power consumption within a window and the external temperature; the difference between the internal and external temperatures characterizes the degree of hysteresis caused by thermal inertia. Second, at a fixed error threshold, the sample intervals at which heating and cooling reach this threshold are recorded to measure the path inconsistency caused by thermal hysteresis. By combining the hysteresis and hysteresis quantities according to a preset ratio, a unified measure of temperature dynamic behavior can be formed. This measure drives small-step corrections to the starting point and slope of temperature segment compensation and smooths the segment boundaries, thereby reducing steps and abrupt slope changes across temperature zones and improving temperature consistency. The principle of risk stabilization lies in unifying the multiple sources of loop stability and thermal safety-related symptoms onto a single risk scale. By comparing the relative order of voltage ripple peak value to current ripple peak value within the target frequency band, phase degradation trends can be identified; by comparing the amplitude ratio of the second peak to the first peak in the same step response, the degree of foldback and underdamping can be quantified; and by assessing the safety margin of the device's internal temperature from the thermal upper limit, the thermal margin convergence can be characterized. By synthesizing the above three items according to preset proportions and limiting them within a fixed range, a risk quantity that can be directly graded is obtained. This facilitates the implementation of proportional and differential self-tuning in conjunction with threshold, hysteresis, and ramp strategies, and also facilitates coordinated linkage with graded derating based on current limiting and reference change rate, achieving stable, timely, and non-excessive protection and recovery when multiple adverse factors are superimposed.

[0028] The present invention is further configured to perform transient follower adjustment of feedforward, proportional, integral, and derivative parameters based on the impulse follower momentum, including: In each control cycle, the impulse follower momentum is read and divided into three levels: low, medium and high according to the preset upper and lower thresholds. Entry and exit must meet the minimum duration and adopt upper and lower hysteresis. Increase the advance compensation of the feedforward branch proportionally according to the gear and set the maximum increment limit and the change slope limit; The proportional channel is raised in small steps according to the gear, with limits on the upper limit and the maximum change in a single cycle; In the intermediate and high gears, the integral channel output is compressed and the integral accumulation is limited. After exiting, it is discharged and restored at a fixed slope. Temporarily increase the differential damping at the higher settings, while maintaining the nominal or slightly increased damping at the lower and intermediate settings; The effective quantity of each channel is output after the target quantity of the gear is limited and ramped; When the impulse falls back to below the release threshold with the momentum and remains at the minimum duration, the feedforward and proportional revert to the nominal value with a fixed slope, the integral recovers with a fixed slope, and the derivative retracts in a predetermined order. If any gear is triggered again during the recovery process, the recovery will be aborted and the new gear will be executed.

[0029] Specifically, the impulse-driven momentum is used as a unified transient intensity characterization. It is compared with preset upper and lower thresholds in each control cycle to obtain the judgment results for three levels: low, medium, and high. The minimum duration and upper / lower hysteresis for entry and exit are adopted to avoid frequent switching caused by noise and short disturbances, and to ensure that once a level is activated, it can be maintained for a sufficient duration to complete a full parameter transition, providing a stable trigger for subsequent adjustments in terms of timing. In terms of adjustment mechanism, the feedforward branch increases the advance compensation proportionally according to the gear, with the aim of offsetting the output offset caused by load change before the error accumulates significantly. The proportional channel is raised in small steps with the gear, shortening the rise time and recovery time by increasing the response gain to instantaneous deviation. At the same time, an upper limit and a maximum change in a single cycle are set to prevent overshoot amplification caused by gain jump. The integral channel is compressed and its accumulation is limited in the intermediate and high gears to suppress the secondary peak and hysteresis caused by integral ingestion during the change phase. After the change ends, it is gradually released at a fixed slope so that the steady-state error gradually returns without generating new oscillations. The differential channel temporarily increases the damping in the high gear to enhance the ability to suppress rapid changes. The low and intermediate levels maintain the nominal or slightly increased damping, thereby achieving a balance between suppressing high-frequency disturbances and maintaining noise tolerance. To ensure continuous and controllable execution, each channel does not directly use the target value of the gear position. Instead, it first undergoes amplitude limiting and ramping processing before being output to the actual channel. This "shaping" process limits the instantaneous maximum amplitude and rate of change, avoiding the impact of parameter mutations on the closed-loop phase margin and reducing the risk of command ringing caused by calculation jitter and measurement noise. Complementing this, the gear release process is configured with a clear regression trajectory: when the impulse momentum decreases to the release threshold and meets the minimum duration, the feedforward and proportional gain return to their nominal values ​​at a fixed slope, the integral gain resumes normal operation at a fixed slope, and the derivative gain withdraws the enhancement amount in a predetermined order, ensuring the system smoothly returns from a strong response state to the normal operating point. If the impulse-driven momentum exceeds the corresponding threshold again during the recovery period, it indicates a new mutation. The strategy immediately suspends the current recovery process and re-executes at the new gear. This interruption and re-entry mechanism ensures real-time performance and robustness against continuous or overlapping disturbances. This allows the entire servo chain to have sufficient agility while maintaining predictable dynamic quality through constraints such as amplitude limiting, ramping, hysteresis, and minimum duration. Ultimately, it achieves faster and more stable output following under mutation conditions, while avoiding overshoot amplification and secondary backtracking.

[0030] The present invention is further configured to perform continuity correction on the starting point, slope, and segment boundary transition of temperature segment compensation based on the temperature hysteresis continuity, including: The ambient temperature is divided into multiple calibration temperature ranges and a transition zone is set between adjacent temperature ranges. Each range includes a starting point and slope compensation parameters. A small correction is made to the starting point of the temperature range based on the temperature hysteresis throughput. The correction amount has an upper limit and a minimum step size and changes monotonically with the temperature hysteresis throughput. When the temperature hysteresis throughput drops below the release threshold, it reverts to the nominal value with a fixed slope. Without changing the basic trend of segmentation, the slope of the temperature segment is slightly modified according to the temperature hysteresis penetration amount. The amount of modification is limited within the segment and restricted in a single cycle. Within the transition zone, a two-segment weighted smoothing method is used for the starting point and slope. The weights change continuously with temperature displacement within the transition zone, resulting in segment boundaries without steps or sharp angles. When the temperature hysteresis throughput exceeds the safety threshold, the temperature-related compensation rate of change is temporarily reduced and a freeze window is set. The freeze is lifted after the temperature drops back below the threshold and remains within the minimum duration.

[0031] Specifically, an interpretable, continuous, and reversible segmented compensation framework is established in the temperature dimension. First, the ambient temperature is divided into several calibration temperature ranges. Each range has two types of compensation parameters: a starting point and a slope, used to characterize the systematic offset of devices and sensors within that temperature range. Because actual thermal processes involve response hysteresis and differences in heating and cooling paths, simple static segmentation can easily create steps or abrupt slope changes at the segment boundaries, introducing voltage fluctuations and jitter. Therefore, thermal hysteresis throughput is introduced as a measure of thermal dynamic consistency, serving as both the driving force and safety valve for overall compensation. In terms of intra-segment adjustment, a larger temperature hysteresis throughput indicates a more significant thermal hysteresis or backlash, and the correction magnitude of the starting point and slope is correspondingly increased to offset the influence of thermal history on the output. When the temperature hysteresis throughput falls below the release threshold, it indicates that the thermal dynamics are stabilizing, and the compensation returns to the nominal value at a fixed slope to prevent over-correction and parameter drift. To ensure closed-loop stability, all corrections are set with upper limits, minimum step sizes, and maximum changes per cycle, forming dual constraints of amplitude and rate, so that parameter changes have sufficient response without compromising phase and damping margins. In the transition between segments, a temperature transition zone is set and a two-segment weighted smoothing method is used. This allows the starting point and slope from the two adjacent segments to be continuously mixed according to the position of the temperature within the transition zone. The weight changes monotonically and continuously with the temperature, thus ensuring that there are no abrupt changes in the numerical values ​​at the segment boundaries. This continuous method can avoid instantaneous disturbances caused by jumps between segments, significantly improving the smoothness and consistency of the temperature scanning process. Under extreme or abnormal thermal conditions, when the temperature hysteresis throughput exceeds the safety threshold, it indicates excessive internal thermal inertia or significant differences in thermal paths. In this case, the rate of temperature-related compensation change is preferentially reduced, and the rapid adjustment channel is temporarily frozen. Once the temperature hysteresis throughput decreases and stabilizes, the freeze is lifted and the channel is gradually restored. This protective throttling mechanism prevents oscillations or secondary shocks caused by frequent corrections when thermal conditions worsen, ensuring stable and controllable output convergence across the entire temperature range and operating conditions.

[0032] The present invention is further configured to perform coordinated stability and derating control on current limiting and reference change rates according to graded thresholds based on the stabilization and derating risk level, including: The risk level is divided into three levels: normal, alarm and restricted. Upward and downward thresholds are set and upward and downward hysteresis and minimum holding time are adopted. In the normal level, the nominal current limit and reference rate of change limit are maintained. In the alarm level, the proportional channel gain is reduced, the derivative damping is increased, and the current limit upper limit and reference rate of change limit are tightened. All changes are performed on a ramp basis. In the limit level, the current limit upper limit and reference rate of change limit are further tightened and an alarm record is generated. The proportional and derivative channels converge to a conservative configuration within a safe range. Uplink handover takes effect immediately after being determined by the high threshold and enters a hold window. No rollback is triggered within the hold window. Downlink handover must meet the low threshold and minimum holding time. All restricted quantities are rolled back on a ramp basis.

[0033] Specifically, using the risk reduction level as a unified risk characterization, multiple sources of indicators such as loop phase degradation, secondary backtracking trends, and thermal safety margins are compressed into a single scale, and three levels—normal, alarm, and limit—are set accordingly. By combining upward and downward thresholds with hysteresis and minimum hold time, the level switching is made directional and sticky, which can respond promptly when the risk rises rapidly, while avoiding frequent jitter near the boundary, ensuring that the control action has sufficient duration to complete a complete stabilization and derating process. In terms of the throttling mechanism, the normal level maintains the nominal current limit and the reference rate of change limit without interfering with the basic performance. Upon entering the alarm level, the proportional and derivative channels are first self-tuned to reduce the proportional gain and increase the derivative damping to increase the system damping and phase margin. At the same time, the upper limit of the current limit and the reference rate of change limit are tightened to reduce the excitation source in a gentle manner. All changes are shaped in a ramp manner to avoid parameter jumps that cause new disturbances. When the risk continues to rise to the limit level, the upper limit of the current limit and the reference rate of change limit are further reduced and fixed to a conservative configuration. At the same time, alarm records are generated for the operation and maintenance side to keep track and trace, thereby achieving controllable throttling and risk containment while maintaining power supply continuity. In terms of the switching strategy, uplink switching takes effect immediately once the high threshold is met and enters a hold window. During the hold window, no rollback requests are responded to, preventing the recently reduced configuration from being immediately offset by a short-term drop in risk indicators. Downlink switching must simultaneously meet the low threshold and the minimum holding time. Each restricted quantity is then gradually withdrawn to a more relaxed limit, ensuring a smooth and predictable recovery process without disrupting the established stable state. Through the synergy of risk grading, parameter self-tuning, and limit linkage, this step can achieve closed-loop control—stabilizing first and then withdrawing, reducing the limit as needed, and gradually recovering—even under multiple adverse factors. This significantly reduces the probability of oscillations and repeated switching, and improves stability and thermal safety margin under all operating conditions.

[0034] The present invention is further configured such that, in S4, a parameter template library is established, and hierarchical management is carried out according to vehicle platform, hardware version, software version, ambient temperature zone and working condition type. All parameters are centrally stored and managed using immutable versions. Online correction includes preparation, replay verification, experimental verification, gray-scale release, full implementation, and observation and convergence. In the preparation stage, upper and lower bounds, minimum step size, and maximum change in a single period are set for parameters. Replay verification is based on the threshold of key indicators from multiple recent windows. Experimental verification observes key indicators within a limited time and sets the maximum allowable risk level. Gray-scale release takes effect gradually by region, vehicle series, batch, or proportion and is recorded throughout. Full implementation is uniformly switched at the control cycle boundary and the actual configuration results are transmitted back. In the observation and convergence stage, small-step fine-tuning is allowed and the adjustment range is automatically reduced when entering the alarm zone.

[0035] Specifically, key parameters for all vehicle models and platforms are centrally managed within a template library. This is achieved by stratifying parameters according to vehicle platform, hardware version, software version, ambient temperature zone, and operating condition type, forming an inheritance relationship of "general templates—vehicle-specific templates—environment and operating condition detailed templates." This ensures that common parameters are reusable and individual parameters are covered, reducing inconsistencies and conflicts caused by decentralized calibration from the source. An immutable version management approach is adopted, generating a new version with historical records for each change, clearly defining the scope and time of effect, ensuring parameter traceability, comparability, and rollback capability, and avoiding uncontrollable risks caused by parallel editing and online "drift." The online correction process adheres to the principles of proactive risk assessment and incremental verification. During the preparation phase, upper and lower bounds, minimum step sizes, and maximum single-cycle variations are set for each parameter to be adjusted. This effectively adds a double safety barrier of amplitude and rate to the parameter tuning action, ensuring that even deviations in direction judgment will not cause sudden shocks to closed-loop stability. Replay verification utilizes real data from multiple recent sliding windows to perform threshold judgments on key indicators such as overshoot, recovery time, steady-state error, temperature fluctuations, and alarm triggering under offline conditions, intercepting obviously unqualified adjustments before they go live. Experimental verification involves online observation of a small range of objects within a limited timeframe, with a maximum permissible risk level set. Any indicator exceeding the limit is immediately withdrawn to prevent problems from spilling over. Gradual rollout is implemented by region, vehicle series, batch, or proportion, allowing for parallel comparison of new and old configurations over a period of time, facilitating the discovery of differences caused by specific operating conditions or regions. Full implementation is achieved through a unified switch at the control cycle boundary, simultaneously transmitting the actual loading results to ensure that no asynchronicity or abrupt changes are introduced at the moment of implementation. During the convergence phase, only small, incremental adjustments are allowed, and the adjustment range is automatically reduced when entering the alarm zone. Frequent oscillations are suppressed through hysteresis and ramp strategies until key indicators stabilize within the target range. Through the combination of the above-mentioned template-based management and phased deployment mechanism, a closed-loop process is achieved for parameters from formulation, verification, distribution to rollback, ensuring both operational safety and consistency while also considering the efficiency and maintainability of mass production for multiple vehicle models.

[0036] The present invention is further configured such that, in S5, a threshold, hysteresis, and minimum duration are set for the anomaly, and the event is determined to be valid if the conditions are met. When multiple anomalies occur concurrently, they should be handled in the following order of priority: overcurrent, overvoltage, temperature exceeding limit, undervoltage, and timing anomalies. Upon triggering a valid event, the dynamic scheduling of the integrated scheduling parameters is immediately frozen, the feedforward is cleared and increments are prohibited, the proportional, integral and derivative parameters are rolled back to the safe level, the integral enters the discharge state, the temperature segment compensation is frozen at the current segment value, and the start time of the freeze and the event type are recorded; the current limit is reduced according to the alarm level and the limit level, the current limit upper limit is lowered and the reference change rate limit is tightened and the damping is increased, the current limit upper limit and the reference change rate limit are reduced, the level can only be upgraded from low to high, and the rollback must meet the recovery conditions and hysteresis time.

[0037] Specifically, a triple constraint of threshold, hysteresis, and minimum duration is introduced throughout the entire process of anomaly identification, action triggering, and recovery. This first filters out instantaneous noise and short-lived disturbances, then makes a definitive judgment on persistent and sufficiently strong anomalies, thereby reducing false alarms and frequent switching. A unified priority order is set for concurrent anomalies, handling the situation with the greatest impact on system safety first, followed by voltage overruns and thermal exceedances, and then power supply insufficiency and timing anomalies. This ensures that the resources and action sequence are consistent with the risk level, avoiding mutual interruption or cancellation. Immediately freezing the integrated scheduling parameters after a valid event is triggered aims to cut off the path of fault amplification through gain scheduling such as servo and through-feed, allowing control to return to a predictable conservative state. Feedforward zeroing prevents the injection of additional energy before errors are corrected. Returning proportional, integral, and derivative parameters to safe levels rapidly increases damping, releases integral accumulation, and reduces high-frequency sensitivity, thereby suppressing overshoot and oscillation. Temperature segment compensation is frozen at the current segment value to avoid cross-segment jumps caused by parameter self-adjustment before the thermal state is stable. Simultaneously, the start time and event type of the freeze are recorded to provide a basis for subsequent traceability and recovery assessment. The derating strategy employs a tiered design with alarm and limit levels, requiring that the level can only increase and not decrease until clear recovery conditions and hysteresis times are met before rollback is permitted. The alarm level gently reduces excitation and gain by lowering the current limit upper limit, tightening the reference rate of change limit, and increasing damping, prioritizing loop stabilization. The limit level further compresses the power supply capacity, maintaining the output at more conservative boundaries when necessary to ensure rapid thermal and voltage recovery. Hysteresis and minimum holding time are set before rollback to prevent repeated crossings near the threshold that cause operational jitter. During rollback, limits are gradually released in a ramp and fixed sequence, allowing the system to smoothly transition from the protection state to normal operation. Through this closed-loop mechanism of identification, freezing, tiered derating, and conditional rollback, rapid and safe external protection under abnormal scenarios is ensured, while also maintaining controllability and predictability of the recovery process.

[0038] Example 2: Please see Figure 2 This exemplary dynamic adjustment system for DC-DC power supply in a new energy vehicle is used to implement the aforementioned dynamic adjustment method for DC-DC power supply in a new energy vehicle, comprising: Data acquisition module: Establishes a time base consistent with the control cycle, synchronously collects output voltage, output current, battery side voltage, vehicle operating conditions and ambient temperature, and updates the sliding window according to the control cycle; Parameter generation module: preprocesses and identifies the operating conditions of the data within the sliding window, and generates a set of comprehensive scheduling parameters for drive control within the same sliding window. The comprehensive scheduling parameters include at least impulse follower, temperature hysteresis penetration and stability risk. Among them, impulse follower is used to characterize the intensity of the sudden change and the energy flow direction, temperature hysteresis penetration is used to characterize temperature hysteresis and thermal hysteresis, and stability risk is used to characterize stability risk and thermal safety margin. Parameter adjustment module: While maintaining the basic control structure of the voltage outer loop and current inner loop unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient servo adjustment of feedforward, proportional, integral and derivative functions according to impulse servo momentum; correction of the starting point, slope and segment boundary transition of temperature segment compensation according to temperature hysteresis continuity; and coordinated stability and derating control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk. Management and correction module: performs centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; Anomaly Handling Module: When undervoltage, overvoltage, overcurrent, temperature exceeding limits, or timing anomalies occur, protection and derating strategies are executed first, dynamic scheduling of integrated scheduling parameters is frozen, and the system enters the safety handling process.

[0039] It should be noted that the dynamic adjustment system for DC-DC power supply in new energy vehicles provided in the above embodiments and the dynamic adjustment method for DC-DC power supply in new energy vehicles provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the dynamic adjustment system for DC-DC power supply in new energy vehicles provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the system can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for dynamically adjusting the DC-DC power supply of a new energy vehicle, characterized in that, include: S1: Establish a time reference consistent with the control cycle, synchronously collect output voltage, output current, battery side voltage, vehicle operating conditions and ambient temperature, and update the sliding window according to the control cycle; S2: Preprocess and identify the operating conditions of the data within the sliding window, and generate a set of comprehensive scheduling parameters for drive control within the same sliding window. The comprehensive scheduling parameters include at least the impulse follower, the temperature hysteresis flow, and the stability drop risk. The impulse follower is used to characterize the intensity of the sudden change and the energy flow direction, the temperature hysteresis flow is used to characterize the temperature hysteresis and thermal hysteresis, and the stability drop risk is used to characterize the stability risk and thermal safety margin. S3: While maintaining the basic control structure of the voltage outer loop and current inner loop unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient servo adjustment of feedforward, proportional, integral and derivative functions according to impulse servo momentum; correction of the starting point, slope and segment boundary transition of temperature segment compensation according to temperature hysteresis continuity; and coordinated stability and derating control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk. S4: Centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; S5: When undervoltage, overvoltage, overcurrent, temperature exceeding the limit, or timing abnormality occurs, protection and derating strategies are executed first, the dynamic scheduling of integrated scheduling parameters is frozen, and the process enters the safety handling procedure.

2. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 1, characterized in that, In S1, a unified time scale consistent with the control cycle is established using the vehicle-side master clock. At the unified trigger edge of each control cycle, the output voltage, output current, battery-side voltage, vehicle operating parameters, and ambient temperature are synchronously sampled. The window length is a preset number of control cycles, and the sampling frequency is greater than or equal to 1kHz.

3. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 1, characterized in that, In S2, the data within the sliding window is preprocessed and operating condition is identified, including: Perform a completeness check on the data for each control cycle within the window. If any channel is missing for a single time, the most recent valid value will be used as a short-term replacement and a replacement mark will be added. Amplitude limiting and de-glitching are performed on the data of each channel, and time alignment between channels is completed. The ambient temperature of the low-speed quantity is aligned with that of the high-speed quantity using either hold or slight interpolation. Perform physical consistency checks, including at least the basic constraints of voltage, current and power relationships, and mark samples that do not meet the consistency requirements as abnormal and exclude them; A sudden change judgment threshold is set based on the change amplitude of the output current and the equivalent index on the load side between adjacent samples. Combined with the rising or falling direction of the battery side voltage, it is identified as acceleration, regeneration or start-stop conversion. When the change amplitude is continuously lower than the threshold and the duration reaches the set value, it is identified as steady state, and the operating condition label and intensity level are output.

4. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 3, characterized in that, In S2, the impulse momentum is synthesized by the maximum adjacent change amplitude of the output current within the window and the maximum adjacent change amplitude of the equivalent index on the load side according to a preset ratio. The thermal hysteresis throughput is a composite of the hysteresis quantity, which is the difference between the estimated internal temperature of the device and the external temperature, calculated from the average power consumption and the external temperature within the window, and the thermal hysteresis quantity characterized by the sample distance between the heating path and the cooling path at a fixed error threshold, according to a preset ratio. The risk of stabilization is synthesized by the phase degradation indicator obtained from the sequential relationship between the peak voltage ripple and the peak current ripple, the backlash measure obtained from the amplitude ratio of the second peak to the first peak of the same step response, and the thermal margin measure obtained from the safety belt of the internal temperature relative to the upper limit of the thermal limit, according to a preset ratio.

5. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 4, characterized in that, The transient servo adjustment of feedforward, proportional, integral, and derivative functions based on the impulse servo momentum includes: In each control cycle, the impulse follower momentum is read and divided into three levels: low, medium and high according to the preset upper and lower thresholds. Entry and exit must meet the minimum duration and adopt upper and lower hysteresis. Increase the advance compensation of the feedforward branch proportionally according to the gear and set the maximum increment limit and the change slope limit; The proportional channel is raised in small steps according to the gear, with limits on the upper limit and the maximum change in a single cycle; In the intermediate and high gears, the integral channel output is compressed and the integral accumulation is limited. After exiting, it is discharged and restored at a fixed slope. Temporarily increase the differential damping at the higher settings, while maintaining the nominal or slightly increased damping at the lower and intermediate settings; The effective quantity of each channel is output after the target quantity of the gear is limited and ramped; When the impulse falls back to below the release threshold with the momentum and remains at the minimum duration, the feedforward and proportional revert to the nominal value with a fixed slope, the integral recovers with a fixed slope, and the derivative retracts in a predetermined order. If any gear is triggered again during the recovery process, the recovery will be aborted and the new gear will be executed.

6. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 4, characterized in that, Based on the temperature hysteresis penetration amount, the starting point, slope, and segment boundary transition of temperature segment compensation are corrected, including: The ambient temperature is divided into multiple calibration temperature ranges and transition zones are set between adjacent temperature ranges. Each range includes a starting point and slope compensation parameters. A small correction is made to the starting point of the temperature range based on the temperature hysteresis throughput. The correction amount has an upper limit and a minimum step size and changes monotonically with the temperature hysteresis throughput. When the temperature hysteresis throughput drops below the release threshold, it reverts to the nominal value with a fixed slope. Without changing the basic trend of segmentation, the slope of the temperature segment is slightly modified according to the temperature hysteresis penetration amount. The amount of modification is limited within the segment and restricted in a single cycle. Within the transition zone, a two-segment weighted smoothing method is used for the starting point and slope. The weights change continuously with temperature displacement within the transition zone, resulting in segment boundaries without steps or sharp angles. When the temperature hysteresis throughput exceeds the safety threshold, the temperature-related compensation rate of change is temporarily reduced and a freeze window is set. The freeze is lifted after the temperature drops back below the threshold and remains within the minimum duration.

7. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 4, characterized in that, Based on the risk level of stabilization and reduction, and according to the tiered thresholds, the current limiting and reference change rate are controlled in a coordinated manner to balance stability and reduction, including: The risk level is divided into three levels: normal, alarm and restricted. Upward and downward thresholds are set and upward and downward hysteresis and minimum holding time are adopted. In the normal level, the nominal current limit and reference rate of change limit are maintained. In the alarm level, the proportional channel gain is reduced, the derivative damping is increased, and the current limit upper limit and reference rate of change limit are tightened. All changes are performed on a ramp basis. In the limit level, the current limit upper limit and reference rate of change limit are further tightened and an alarm record is generated. The proportional and derivative channels converge to a conservative configuration within a safe range. Uplink handover takes effect immediately after being determined by the high threshold and enters a hold window. No rollback is triggered within the hold window. Downlink handover must meet the low threshold and minimum holding time. All restricted quantities are rolled back on a ramp basis.

8. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 1, characterized in that, In S4, a parameter template library is established, and it is managed hierarchically according to vehicle platform, hardware version, software version, ambient temperature zone and operating condition type. All parameters are centrally stored and managed using immutable versions. Online correction includes preparation, replay verification, experimental verification, gray-scale release, full implementation, and observation and convergence. In the preparation stage, upper and lower bounds, minimum step size, and maximum change in a single period are set for parameters. Replay verification is based on the threshold of key indicators from multiple recent windows. Experimental verification observes key indicators within a limited time and sets the maximum allowable risk level. Gray-scale release takes effect gradually by region, vehicle series, batch, or proportion and is recorded throughout. Full implementation is uniformly switched at the control cycle boundary and the actual configuration results are transmitted back. In the observation and convergence stage, small-step fine-tuning is allowed and the adjustment range is automatically reduced when entering the alarm zone.

9. The method for dynamic adjustment of DC-DC power supply in a new energy vehicle according to claim 1, characterized in that, In S5, thresholds, hysteresis, and minimum duration are set for anomalies, and events that meet the conditions are considered valid events. When multiple anomalies occur concurrently, they should be handled in the following order of priority: overcurrent, overvoltage, temperature exceeding limit, undervoltage, and timing anomalies. Upon triggering a valid event, the dynamic scheduling of the integrated scheduling parameters is immediately frozen, the feedforward is cleared and increments are prohibited, the proportional, integral and derivative parameters are rolled back to the safe level, the integral enters the discharge state, the temperature segment compensation is frozen at the current segment value, and the start time of the freeze and the event type are recorded; the current limit is reduced according to the alarm level and the limit level, the current limit upper limit is lowered and the reference change rate limit is tightened and the damping is increased, the current limit upper limit and the reference change rate limit are reduced, the level can only be upgraded from low to high, and the rollback must meet the recovery conditions and hysteresis time.

10. A dynamic adjustment system for DC-DC power supply in a new energy vehicle, used to implement the dynamic adjustment method for DC-DC power supply in a new energy vehicle as described in any one of claims 1-9, characterized in that, include: Data acquisition module: Establishes a time base consistent with the control cycle, synchronously collects output voltage, output current, battery side voltage, vehicle operating conditions and ambient temperature, and updates the sliding window according to the control cycle; Parameter generation module: preprocesses and identifies the operating conditions of the data within the sliding window, and generates a set of comprehensive scheduling parameters for drive control within the same sliding window. The comprehensive scheduling parameters include at least impulse follower, temperature hysteresis penetration and stability risk. Among them, impulse follower is used to characterize the intensity of the sudden change and the energy flow direction, temperature hysteresis penetration is used to characterize temperature hysteresis and thermal hysteresis, and stability risk is used to characterize stability risk and thermal safety margin. Parameter adjustment module: While maintaining the basic control structure of the voltage outer loop and current inner loop unchanged, parameter-level adjustment is performed based on comprehensive scheduling parameters, including: transient servo adjustment of feedforward, proportional, integral and derivative functions according to impulse servo momentum; correction of the starting point, slope and segment boundary transition of temperature segment compensation according to temperature hysteresis continuity; and coordinated stability and derating control of current limiting and reference change rate according to graded thresholds based on stabilization and derating risk. Management and correction module: performs centralized management and online correction of window length, weight, threshold, and correction coefficient at the vehicle model level; Anomaly Handling Module: When undervoltage, overvoltage, overcurrent, temperature exceeding limits, or timing anomalies occur, protection and derating strategies are executed first, dynamic scheduling of integrated scheduling parameters is frozen, and the system enters the safety handling process.

Images