Control method for dynamic parking function of new energy vehicle and vehicle

Abstract

The invention discloses a control method for a dynamic parking function of a new energy vehicle. The control method comprises the steps that vehicle braking system data are collected to judge whether the dynamic parking function of a CDP is started or not; and after it is judged that the CDP dynamic parking function is started, whether the vehicle currently meets the activation condition or not is monitored in real time, and after the activation condition is met, the dynamic parking CDP function is activated, and braking pressure is generated through a hydraulic braking system to control the vehicle to be braked to the parking state. The method has the advantages that reliable starting and activating of the CDP function and automatic monitoring and testing of the CDP function are achieved through logic control, effective and reliable operation of the CDP function of the vehicle is guaranteed, meanwhile, a testing scheme of the CDP function is designed, and a reliable testing scheme is provided for normality of the CDP function.

Description

Technical Field

[0001] The present invention relates to the field of parking brakes for new energy vehicles, and particularly to a control method and a vehicle for the dynamic parking function of new energy vehicles. Background Art

[0002] As one of the additional functions of the electronic hydraulic braking system EHB, the dynamic parking function CDP can provide redundant functions for vehicle braking. CDP dynamic parking is a hydraulic parking braking method applicable to emergency situations. When the driver cannot decelerate and stop the vehicle through the brake pedal, the parking control can be achieved through the CDP function. The traditional operation method is to directly pull up the EPB switch for a long time to activate the dynamic parking system, and then enter to activate the CDP function. After the CDP function is activated, the hydraulic braking pressure is increased within a short time to achieve vehicle braking control and improve the driving safety of the vehicle in special situations.

[0003] Since the CDP parking function belongs to automatic braking after brake failure, its function control is very important. Therefore, its execution control requirements are more stringent to ensure the effective operation of the vehicle in the case of pedal brake failure. However, the existing technology does not have a reliable start activation and control design for the CDP function. Only by simply pulling down the electronic handbrake for a long time, the control logic is single, the safety control is insufficient, and there is a lack of a test scheme for its function, and it is impossible to judge the normal operation of the function. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a control method and a vehicle for the dynamic parking function of new energy vehicles, which realize the reliable start activation of the CDP function and the automatic monitoring and testing of the CDP function through logical control.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a control method for the dynamic parking function of new energy vehicles, including collecting vehicle braking system data to judge whether the CDP dynamic parking function is turned on; after judging that the CDP dynamic parking function is turned on, continuously monitor whether the vehicle currently meets the activation conditions, and after meeting the activation conditions, activate the CDP function of dynamic parking and generate braking pressure through the hydraulic braking system to control the vehicle to brake to a stop state.

[0006] Collect the states of the wire-controlled braking system WCBS and the EPB. When it is judged that the ECBS system has no fault and the EPB switch signal is normal, it is judged that the CDP dynamic parking function is turned on.

[0007] After the CDP dynamic parking function is turned on, continuously monitor the vehicle speed and the trigger state of the EPB switch. When the vehicle speed is greater than the set vehicle speed threshold and the time when the EPB switch is pulled up exceeds the time threshold, it is judged that the CDP function of dynamic parking is activated.

[0008] After the CDP function is activated, during the vehicle braking process controlled by hydraulic braking, the function exit conditions are monitored in real time. After the function exit conditions are met, the CDP function exits immediately or exits after a delay.

[0009] The CDP function exit conditions include that when the EPB switch is detected to be released, the CDP function exits immediately; if the EPB switch is detected to be continuously pulled up, then when the vehicle speed is detected to be lower than the set vehicle speed threshold, the CDP function will gradually control the hydraulic braking to release pressure and complete the parking control through the EPB when the vehicle is stationary. After the parking is completed, the CDP function is controlled to completely release pressure.

[0010] After a vehicle failure is detected, the CDP function will be degraded and the electronic parking brake system will complete the vehicle braking control; the degraded faults include any one of the following faults: the WCBS system is in an abnormal working state, wheel speed fault, ESC system fault, ABS system fault, and EPB switch fault.

[0011] After the CDP function is turned on, the trigger state of the vehicle's brake pedal and the vehicle acceleration signal are monitored in real time. When it is detected that the vehicle's brake pedal is triggered and the vehicle acceleration signal does not change following the brake pedal, it is determined that there is a brake braking fault at this time, and the CDP function is automatically activated for braking.

[0012] After the CDP function is activated, the vehicle control unit VCU transmits the CDP function activation signal to the electronic parking brake system. The electronic parking brake system sends a dynamic braking request and a deceleration value to the wire-controlled braking system WCBS, and the hydraulic control unit HCU of the wire-controlled braking system controls the four-wheel wheel cylinders to increase pressure to achieve that the vehicle braking deceleration reaches the set threshold.

[0013] After each activation of the CDP function, the vehicle's acceleration signal, yaw rate signal, the time data required for the deceleration to reach the set threshold since activation, and the steering wheel correction angle data are collected and calculated. According to the collected and calculated results, the CDP function is evaluated and verified, and the verification result is output.

[0014] A vehicle is provided with a dynamic parking CDP function, and the dynamic parking CDP function is controlled by adopting the above-mentioned control method.

[0015] The advantages of the present invention are as follows: The reliable start and activation of the CDP function are realized through logical control, and the automatic monitoring and testing of the CDP function are realized, which ensures the effective and reliable operation of the vehicle's CDP function. At the same time, a test scheme for the CDP function is designed, which provides a reliable test scheme for the normal operation of the CDP function. Description of the Drawings

[0016] The following is a brief description of the content expressed in each drawing of the specification of the present invention and the markings in the drawings:

[0017] Figure 1 It is the internal system architecture diagram of the CDP dynamic parking function of the present invention;

[0018] Figure 2 It is the vehicle signal function diagram of the CDP dynamic parking of the present invention;

[0019] Figure 3 It is the test flow chart of the CDP dynamic parking function of the present invention. Specific Embodiments

[0020] The following further describes in detail the specific embodiments of the present invention by describing the optimal embodiments with reference to the drawings.

[0021] A control method for the dynamic parking function of a new energy vehicle provided in this embodiment realizes accurate and reliable braking control through the control strategy of the dynamic parking function. When the brake pedal of the new energy vehicle cannot provide effective braking force, a certain deceleration is provided through the dynamic parking function or the vehicle can be completely stopped within a short time, effectively reducing the collision caused by the accident or effectively avoiding the occurrence of the accident. In addition, the key points for the functional acceptance of the vehicle performance dynamic parking CDP function from the acceptance perspective are proposed, as well as the functional test plan for the actual vehicle, improving the requirements for the pre-delivery test and the post-delivery functional test evaluation of the vehicle.

[0022] The specific solution is as follows:

[0023] A control method for the dynamic parking function of a new energy vehicle in this solution is used to realize the braking control of the vehicle through the CDP function after the brake pedal braking fails, and it includes the following steps:

[0024] S1. Collect the data of the vehicle braking system to judge whether the CDP dynamic parking function is turned on;

[0025] S2. After judging that the CDP dynamic parking function is turned on, monitor in real time whether the vehicle currently meets the activation conditions;

[0026] S3. After meeting the activation conditions, activate the dynamic parking CDP function and generate braking pressure through the hydraulic braking system to control the vehicle to brake to a stop state.

[0027] In step S1, the states of the wire-controlled braking system WCBS and the EPB are collected. When it is determined that the ECBS system is fault-free and the EPB switch signal is normal, it is determined that the CDP dynamic parking function is enabled. Since the activation of the CDP function depends on the WCBS system and the EPB switch, it is necessary to determine whether both are in a normal state. If they are in a normal state, the CDP function is enabled; otherwise, the CDP function is disabled to avoid the disorder of the CDP function caused by the failure of the WCBS or the EPB switch.

[0028] After the CDP function is enabled, the CDP function needs to be controlled to be activated only when the brake pedal braking fails or cannot meet the requirements. Therefore, it is necessary to judge the activation conditions. In step S2, after the CDP dynamic parking function is enabled, the vehicle speed and the trigger state of the EPB switch are monitored in real time. When the vehicle speed is greater than the set vehicle speed threshold and the EPB switch has been pulled up for more than the time threshold, it is determined that the dynamic parking CDP function is activated. When the vehicle speed is too low or the EPB switch has been pulled up for less than the time threshold, the CDP function is not enabled at this time because the braking demand is very small when the vehicle speed is too low. The CDP function is activated only when the EPB switch is triggered when the vehicle speed meets certain requirements. Since the EPB switch is the parking brake switch, in order to avoid incorrect braking caused by accidental triggering, it is required that the EPB switch be pulled up for a set time length, which can avoid the error of the EPB in a short time, thereby improving the accuracy and reliability of the activation of the CDP function.

[0029] After the CDP function is activated, the vehicle will be braked hydraulically through the WCBS. After the braking is completed, the function needs to be exited, and the function exit conditions are set. The CDP function will be exited after the braking exit conditions are met. After the CDP function is activated and the vehicle braking process is controlled hydraulically, the function exit conditions are monitored in real time. When the function exit conditions are met, the CDP function will be exited immediately or after a delay.

[0030] Among them: The CDP function exit conditions include that when it is detected that the EPB switch is released, the CDP function will exit immediately; if it is detected that the EPB switch is continuously pulled up, then when it is detected that the vehicle speed is lower than the set vehicle speed threshold, the CDP function will gradually control the hydraulic braking to release pressure and complete the parking control through the EPB when the vehicle is stationary. After the parking is completed, the CDP function is controlled to completely release pressure. Since the CDP function brakes hydraulically through the WCBS system, it is necessary to release the pressure after the braking is completed. However, in order to ensure parking after braking, it is necessary to control the vehicle to park through the EPB after the braking reaches a vehicle speed lower than the set speed. After the parking is completed, the CDP function is exited after the hydraulic pressure is released. At this time, the CDP function completes the braking.

[0031] In this embodiment, to ensure the reliability of the CDP function, after a vehicle fault is detected, the CDP function will be degraded and the EPB will complete the vehicle braking control; the degraded faults include any one of the following faults: the WCBS system is in an abnormal working state, wheel speed fault, ESC system fault, ABS system fault, and EPB switch fault. After the CDP function is degraded, the hydraulic braking is no longer triggered, and the EPB completes the vehicle dynamic braking.

[0032] In a preferred embodiment of the present application, after the CDP function is enabled, the triggering state of the vehicle's brake pedal and the vehicle acceleration signal are monitored in real time. When it is detected that the vehicle's brake pedal is triggered and the vehicle acceleration signal does not change following the brake pedal, it is determined that there is a brake braking fault at this time, and the CDP function is automatically activated for braking. By collecting the state of the brake pedal and the acceleration and deceleration changes corresponding to the current vehicle speed, it is determined whether the vehicle brakes according to the requirements of the brake pedal. If there is no deceleration or the deceleration does not reach the set deceleration requirement after the brake pedal is depressed, it is determined that there is a fault in the brake for braking. At this time, if it is detected that the brake pedal is continuously triggered, the CDP function is actively activated, and the hydraulic braking WCBS system is controlled through the CDP function to achieve braking control. At the same time, a reminder of the braking system fault and braking using the CDP function is issued through the instrument to remind the user of the vehicle state at this time. The CDP function is continuously activated only when the brake pedal is continuously depressed. When the brake pedal changes from being depressed to not being depressed, the CDP function is controlled to exit at this time, and the braking control of the CDP function ends.

[0033] When braking control is performed through the CDP, hydraulic braking is utilized. That is, after the CDP function is activated, the vehicle controller VCU transmits the CDP function activation signal to the electronic parking brake system. The electronic parking brake system sends a dynamic braking request and a deceleration value to the wire-controlled braking system WCBS, and the hydraulic control unit HCU of the wire-controlled braking system controls the four-wheel wheel cylinders to increase pressure to achieve a vehicle braking deceleration reaching the set threshold.

[0034] After the CDP function is activated, the pressure of the braking hydraulic pressure is achieved through hydraulic braking to reach the pre-set calibration, thereby achieving the pre-set deceleration value. The braking deceleration is adjusted and controlled by adjusting the hydraulic braking force of the hydraulic braking. Generally, the braking deceleration is required to be greater than or equal to 0.6g.

[0035] In a preferred embodiment, in order to verify the CDP function during each activation of the CDP function to the complete braking process and determine whether the function of the CDP function after activation at this time meets the design requirements, therefore, after each activation of the CDP function, the acceleration signal, yaw rate signal of the whole vehicle, the time data required for the deceleration to reach the set threshold from the start of activation, and the steering wheel correction angle data are collected and calculated. The CDP function is evaluated and verified according to the collected and calculated results, and the verification result is output. Only when the deceleration data, yaw rate signal, the time data required for the deceleration to reach the set threshold from the start of activation, and the steering wheel correction angle data during the braking process controlled by the CDP function this time all meet the preset CDP function requirements, it is determined that the CDP function is normal this time; otherwise, it is determined that the CDP function is abnormal, and the judgment result of the CDP function is displayed to the user through the instrument panel.

[0036] In a preferred embodiment, during the factory stage or the user trial stage, the vehicle can be used to activate the CDP function according to a specified mode to verify the effectiveness of the CDP function. By combining the active opening verification and the verification carried out by passive activation of the CDP function, the function verification under various conditions of the CDP function can be realized. The verification method is as follows: 1) On a high-friction road surface, with the vehicle fully loaded, the gears are in the forward gear and reverse gear respectively. At the specified vehicle speed, long-press the parking switch until the vehicle stops. The required peak deceleration should reach the specified value, and the time from pressing the parking switch to reaching the peak deceleration should be less than the calibrated value, and the yaw angle and steering wheel correction angle meet the requirements; 2) On a simulated low-friction road surface, with the vehicle fully loaded, the gear is in the forward gear. At the specified vehicle speed, long-press the parking switch until the vehicle stops. The required peak deceleration should reach the specified value, and the yaw angle and steering wheel correction angle meet the requirements; 3) On the oncoming road surface and the docking road surface, with the vehicle fully loaded, the gear is in the forward gear. At the specified vehicle speed, long-press the parking switch until the vehicle stops. The required peak deceleration should reach the specified value, and the yaw angle and steering wheel correction angle meet the requirements; 4) In the fixed-circle working condition, with the vehicle fully loaded, the gear is in the forward gear. At the specified vehicle speed, the minimum turning radius & the existing fixed-circle radius of the test site, pull up the parking button and hold it until the vehicle stops.

[0037] As Figures 1-3 shown, this embodiment proposes a control strategy, performance requirements and verification method for the dynamic parking (CDP) function of a new energy vehicle. The purpose is to propose a dynamic parking control system strategy, which is used for a new energy vehicle when the braking force is insufficient when stepping on the brake pedal. Using this dynamic parking CDP function can effectively provide a certain deceleration for the whole vehicle or can completely stop the vehicle within a short time, effectively reducing the collision caused by the accident or effectively avoiding the occurrence of the accident. In addition, the key points for the function acceptance of the dynamic parking CDP function of the whole vehicle performance from the acceptance perspective are proposed.

[0038] As Figure 1 、 2 shown, a control strategy, performance requirements and verification method for the dynamic parking (CDP) function of a new energy vehicle include various signals and modules required for the dynamic parking function: including:

[0039] 1) Wheel speed sensor signal;

[0040] 2) Voltage signal;

[0041] 3) Human-machine interface HMI / vehicle instrument signal;

[0042] 4) Body control module BCM;

[0043] 5) Vehicle control unit signal VCU;

[0044] 6) Inertial measurement unit IMU;

[0045] 7) Hydraulic control unit HCU;

[0046] 8) Wire control braking system WCBS.

[0047] Among them, WCBS is a wire control braking system, which includes an additional function of dynamic parking CDP;

[0048] The wheel speed sensor signal is used to monitor the wheel speed and slip ratio of the vehicle when the dynamic parking CDP function is activated;

[0049] The voltage signal is the working condition of the dynamic parking CDP function. When the voltage is normal, the vehicle speed is normal, and the dynamic parking CDP is in the on state, the interaction with the VCU is normal;

[0050] The human-machine interface HMI / vehicle instrument signal. The character signals of the dynamic parking CDP function are concentrated on the vehicle instrument. When CDP is activated, the text prompt "Emergency braking on" appears, and when CDP fails, the text prompt "Dynamic braking function failure" appears.

[0051] The VCU signal receives the dynamic parking CDP signal and then transmits the signal to the electronic parking brake system. The electronic parking brake system sends a dynamic braking request signal and a deceleration value to the WCBS.

[0052] The BCM body control module lights up the brake tail lamp after receiving the activation of the dynamic parking CDP function, performs parking braking after the vehicle stops, and the brake lamp goes out.

[0053] The HCU hydraulic control unit controls the pressurization of the four-wheel wheel cylinders to implement deceleration until the deceleration meets the design requirements;

[0054] The IMU inertial measurement unit can help measure the acceleration and angular velocity of the vehicle, and then determine the attitude and motion state of the vehicle.

[0055] After each activation of the CDP function, data collection is performed during the execution of the CDP function to determine whether the preset performance requirements are met during the braking process after CDP activation. The performance requirements are the CDP function conditions set by the vehicle manufacturer according to the control strategy of the CDP function. The performance requirements include but are not limited to: 1) The time from pulling up the parking switch to reaching a deceleration of 0.6g should not be greater than 600 ms.

[0056] 2) If the parking switch is released after activating the dynamic parking system, the system should immediately exit and the exit time should not be greater than 500 ms.

[0057] 3) After the vehicle stops, a maximum holding pressure time of 2 s will be provided, and the specific holding pressure time is determined by the EPB state.

[0058] In addition to verifying the CDP activation process data after each activation of the CDP function, the CDP function can also be actively turned on or activated to perform performance verification of the CDP function in different environments. This can be used for users to conduct CDP tests by themselves or for the vehicle manufacturer to perform performance tests on the CDP during factory production. The performance verification method is as follows:

[0059] 1) On a high-friction road surface, with the vehicle fully loaded, in forward and reverse gears, at the specified vehicle speed, after pressing and holding the parking switch until the vehicle stops, the required peak deceleration should reach the specified value, and the time from pressing the parking switch to reaching the peak deceleration should be less than the calibrated value, and the yaw angle and steering wheel correction angle should meet the requirements.

[0060] 2) On a simulated low-friction road surface, with the vehicle fully loaded, in the forward gear, at the specified vehicle speed, after pressing and holding the parking switch until the vehicle stops, the required peak deceleration should reach the specified value, and the yaw angle and steering wheel correction angle should meet the requirements.

[0061] 3) On a split road surface and a docking road surface, with the vehicle fully loaded, in the forward gear, at the specified vehicle speed, after pressing and holding the parking switch until the vehicle stops, the required peak deceleration should reach the specified value, and the yaw angle and steering wheel correction angle should meet the requirements.

[0062] 4) In the fixed-circle condition, with the vehicle fully loaded, in the forward gear, at the specified vehicle speed, the minimum turning radius & the existing fixed-circle radius in the test field, pull up the parking button and hold it until the vehicle stops.

[0063] As Figure 1 and Figure 2 shown, the present invention proposes a control strategy, performance requirements and verification method for the dynamic parking (CDP) function of a new energy vehicle. The control strategy is as follows:

[0064] 1) Function status switch

[0065] When the CDP function works properly, it has two states: Not_Active and Active. Not_Active means that the function does not meet the activation conditions, and Active means that the function is in the hydraulic braking state.

[0066] 2) Function activation (CDP_Available&CDP_Not_Active)

[0067] (1) The WCBS system is in a fault-free state;

[0068] (2) The EPB switch signal is normal.

[0069] If the above conditions are met, the CDP function is activated (default to the activated state).

[0070] 3) Function activation (CDP_Not_Active→CDP_Active)

[0071] (1) The driver drives the vehicle to a certain speed, and the speed needs to be greater than 5 km / h;

[0072] (2) Pull the EPB switch for a long time;

[0073] (3) The dynamic parking function is activated, and the hydraulic braking system generates braking pressure.

[0074] 4) Function deactivation (CDP_Active→CDP_Not_Active)

[0075] (1) If the EPB switch is released during the operation of CDP, the CDP function will immediately deactivate.

[0076] (2) When the vehicle speed is lower than 1 km / h, the CDP function will gradually release pressure and provide a 2-s pressure holding time;

[0077] (3) When the EPB completes parking or the pressure holding time exceeds 2 s, the CDP will completely release pressure.

[0078] 5) Fault degradation (CDP_Available→CDP_Not_Available)

[0079] When the following faults occur in the system, the CDP will be degraded and no longer trigger hydraulic braking, and the EPB will complete the vehicle dynamic braking.

[0080] The degradation faults mainly include:

[0081] (1) The WCBS system is in an abnormal working state;

[0082] (2) There is a wheel speed fault;

[0083] (3) ESC system fault;

[0084] (4) ABS system fault;

[0085] (5) EPB switch fault.

[0086] 6) HMI display

[0087] (1) When the CDP function is unavailable, the instrument panel will display;

[0088] (2) When the CDP function is working, the instrument panel will give a prompt.

[0089] As Figure 3 shown, the present invention proposes a method for verifying the dynamic parking (CDP) function of a new energy vehicle, including the following specific matters:

[0090] In step S101, the dynamic parking function (CDP) is default to the on state, on a high-adhesion road surface, the vehicle load is full load, the gears are forward gear and reverse gear respectively. When the forward gear reaches the specified vehicle speeds of 30 / 50 / 80 / 100 kph, long press the parking switch until the vehicle stops; when the reverse gear reaches the vehicle speed of 30 kph, long press the parking switch until the vehicle stops, its peak deceleration > 0.6g, the time from triggering the parking switch signal to reaching the peak deceleration < 1 s, the maximum yaw rate < ±3° / s; the steering wheel correction angle < ±45°; the wheels do not lock, and the vehicle remains within a 2.5-meter passage.

[0091] In step S102, the dynamic parking function (CDP) is default to the on state, on a low-adhesion road surface (snow surface, ice surface), the vehicle load is full load, the gear is forward gear. When the forward gear reaches the specified vehicle speeds of 30 / 50 kph, long press the parking switch until the vehicle stops, its peak deceleration on the snow surface > 0.15g, on the ice surface > 0.05g, the maximum yaw rate < ±5° / s; the steering wheel correction angle < ±45°; the wheels do not lock.

[0092] In step S103, the dynamic parking function (CDP) is default to the on state. For the oncoming and docking road surfaces, the vehicle load is full load, the gear is in the forward gear. When the forward gear reaches the specified vehicle speed of 50 kph, long press the parking switch until the vehicle stops. For the oncoming road surface, its peak deceleration on the snow surface > 0.35(a1 + a2)g, where a1 is the peak deceleration on the high-adhesion road surface and a2 is the peak deceleration on the low-adhesion road surface, the maximum yaw rate < ±7° / s; the steering wheel correction angle < ±45°; the wheels do not lock; for the docking road surface, high to low: the tire lock-up time caused by the WCBS system pressure control: < 0.5 s; low to high: the time for the vehicle deceleration to recover to 70% of the peak deceleration on the high-adhesion road surface after passing through the docking point ≤ 1.2 s; the maximum yaw rate < ±5° / s; the steering wheel correction angle < ±45°.

[0093] In step S104, the dynamic parking function (CDP) is default to the on state. For the fixed circle (high adhesion, snow surface, ice surface) working conditions, the vehicle load is full load, greater than 95% of the limit vehicle speed, the minimum turning radius & the existing fixed circle radius of the test site. Pull up the parking button and hold it until the vehicle stops. Its peak deceleration > 70% of the straight-line deceleration under the same road conditions, and the steering wheel correction angle < ±90°.

[0094] The present invention proposes a control strategy, performance requirements and verification method for the dynamic parking (CDP) function of a new energy vehicle. The dynamic parking CDP function and its performance are now well-known to the majority of vehicle users. Generally, the dynamic parking CDP function is default to the on state when the vehicle is powered on. This article proposes a safe and reliable control strategy for the dynamic parking CDP function, which can ensure that a deceleration of more than 0.6g can be obtained in a short time under the working conditions where this function needs to be used, avoid the occurrence of some accidents, and reduce the market complaints of customers. At the same time, the performance requirement parameters of the dynamic parking CDP function are proposed, which has certain reference significance for the subsequent vehicle manufacturers to calibrate the dynamic parking CDP function. In addition, the test verification method of the dynamic parking CDP function is proposed to provide a guiding direction for the test engineers to accept this function.

[0095] Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A control method for a dynamic parking function of a new energy vehicle, characterized in that: It includes collecting vehicle braking system data to determine whether the CDP dynamic parking function is turned on; after determining that the CDP dynamic parking function is turned on, real-time monitoring of whether the vehicle currently meets the activation conditions. After the activation conditions are met, the dynamic parking CDP function is activated and braking pressure is generated through the hydraulic braking system to control the vehicle to brake to a parking state.

2. A control method for a dynamic parking function of a new energy vehicle as claimed in claim 1, characterized in that: The status of the wire control brake system WCBS and EPB is collected. When it is determined that the ECBS system has no faults and the EPB switch signal is normal, it is determined that the CDP dynamic parking function is turned on.

3. A control method for a dynamic parking function of a new energy vehicle as claimed in claim 1, characterized in that: After the CDP dynamic parking function is turned on, the vehicle speed and the triggering status of the EPB switch are monitored in real time. When the vehicle speed is greater than the set speed threshold and the EPB switch is pulled up for more than the time threshold, the dynamic parking CDP function is judged to be activated.

4. A method for controlling a dynamic parking function of a new energy vehicle according to any one of claims 1 to 3, characterized in that: After the CDP function is activated, the vehicle braking process is controlled by hydraulic braking, and the function exit conditions are monitored in real time. When the function exit conditions are met, the CDP function is exited immediately or after a delay.

5. A control method for a dynamic parking function of a new energy vehicle as claimed in claim 4, characterized in that: The exit conditions of the CDP function include: when it is detected that the EPB switch is released, the CDP function will exit immediately; if it is detected that the EPB switch is continuously pulled up, then when the vehicle speed is detected to be lower than the set speed threshold, the CDP function will gradually control the hydraulic brake pressure to release and complete parking control through EPB when the vehicle is stationary. After parking is completed, the CDP function will be controlled to completely release pressure.

6. A control method for a dynamic parking function of a new energy vehicle as claimed in claims 1 to 3, characterized in that: After a vehicle fault is detected, the CDP function will be downgraded and the EPB will complete the braking control of the entire vehicle; the downgraded faults include: the WCBS system is in an abnormal working state, wheel speed fault, ESC system fault, ABS system fault, and any of the EPB switch faults.

7. A method for controlling a dynamic parking function of a new energy vehicle according to any one of claims 1 to 3, characterized in that: After the CDP function is turned on, the trigger status of the vehicle's brake pedal and the vehicle's acceleration signal are monitored in real time. When it is detected that the vehicle's brake pedal is triggered and the vehicle's acceleration signal does not change with the brake pedal, it is judged that there is a brake failure at this time, and the CDP function is automatically activated for braking.

8. The control method for the dynamic parking function of a new energy vehicle according to any one of claims 1 to 3, characterized in that: After the CDP function is activated, the vehicle controller VCU transmits the CDP function activation signal to the electronic parking brake system. The electronic parking brake system sends a dynamic braking request and deceleration value to the wire control brake system WCBS. The HCU hydraulic control unit of the wire control brake system controls the four-wheel cylinder boost to achieve the vehicle braking deceleration reaching the set threshold.

9. A method for controlling a dynamic parking function of a new energy vehicle according to any one of claims 1 to 3, characterized in that: After each CDP function is activated, the vehicle's acceleration signal, yaw rate signal, time data required for the deceleration to reach the set threshold from the start of activation, and steering wheel correction angle data are collected and calculated. The CDP function is evaluated and verified based on the collection and calculation results, and the verification results are output.

10. A vehicle, characterized in that: The vehicle is provided with a dynamic parking CDP function, and the dynamic parking CDP function is controlled by the control method according to claims 1-9.

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