Failure management method for electrically controlled parking system

Abstract

The application discloses a kind of failure management methods of electric control parking system, comprising: the failure fault of electric control parking system is classified, is classified into electrical fault, sensor failure, failure fault and unexpected failure;Failure mode and effect analysis are carried out to each failure fault, and the corresponding post-processing measure of each failure fault is determined according to failure mode and effect analysis;Wherein, the post-processing measure of electrical fault includes no longer parking control;The post-processing measure of sensor failure includes no longer parking control or open loop parking control;The post-processing measure of failure fault includes parking control;The post-processing measure of unexpected failure includes parking control;Wherein, parking control is into parking brake control or release parking brake control.The failure management method of electric control parking system provided improves the availability under failure mode on the basis of guaranteeing the safety of vehicle, and optimizes the comprehensive performance of vehicle in availability and safety.

Description

Technical Field

[0001] This invention relates to the technical field of vehicle electronic parking control methods, and in particular to a failure management method for an electronic parking system. Background Technology

[0002] The electronic parking system replaces the traditional mechanical cable-operated parking mechanism, and its fault diagnosis and after-treatment are crucial for ensuring passenger safety. Failure to effectively diagnose and address the problem could lead to a misalignment between the vehicle's powertrain control and the driver's intended actions, potentially causing serious accidents and compromising passenger safety. Furthermore, while disabling certain vehicle functions is necessary to ensure safety after a fault is detected, disabling too many functions could impair vehicle usability in some situations.

[0003] The current management methods for electronic parking system failures have the following problems: the failure level classification and post-processing definitions are not detailed enough; a single post-processing is used for different degrees of failure; and in order to ensure safety in all failure modes, the most stringent post-processing method is usually used, which affects the vehicle availability when the failure is minor. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing methods for managing the failure of electronically controlled parking systems may affect vehicle availability. It provides a failure management method for electronically controlled parking systems that improves availability under failure modes while ensuring vehicle safety, thus optimizing the overall performance of the vehicle in terms of both availability and safety.

[0005] To address the aforementioned problems, this invention provides a failure management method for an electronically controlled parking system, comprising: classifying the failures of the electronically controlled parking system into electrical failures, sensor failures, unsuccessful failures, and undesirable failures; performing failure mode and effect analysis on each type of failure; and determining the corresponding post-processing measures for each type of failure based on the failure mode and effect analysis.

[0006] The post-processing measures for electrical faults include ceasing to perform parking control; the post-processing measures for sensor faults include ceasing to perform parking control or performing parking control in an open-loop manner; the post-processing measures for failed faults include performing parking control; the post-processing measures for unexpected faults include performing parking control; wherein, parking control is either entering parking brake control or releasing parking brake control.

[0007] By adopting the above scheme, the failure modes of the electronic parking system are classified, and different post-processing measures are adopted for different categories of failure modes. While ensuring vehicle safety, the availability of the vehicle under failure modes is improved, and the overall performance of the vehicle in terms of availability and safety is optimized.

[0008] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in the embodiments of the present invention includes electrical faults such as parking brake entry electrical faults and parking brake release electrical faults; failure faults such as parking brake entry failure faults and parking brake release failure faults; and unexpected faults such as unexpected parking brake entry faults and unexpected parking brake release faults.

[0009] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in the embodiment of the present invention further includes: performing failure mode and effect analysis on each type of failure, and classifying the state of the vehicle's gear shift lever when the failure occurs according to the failure mode and effect analysis, wherein the state of the gear shift lever includes the following four types.

[0010] First state: The gear shift lever is switched to the parking position. The corresponding failure faults include electrical faults in entering the parking brake, electrical faults in releasing the parking brake, sensor faults, and failure to enter the parking brake. When an electrical fault in entering the parking brake, an electrical fault in releasing the parking brake, or a sensor fault occurs, the follow-up measures include ceasing to control the entry of the parking brake. When a failure to enter the parking brake occurs, the follow-up measures include controlling the entry of the parking brake.

[0011] Second state: The gear shift lever remains in the parking position. The corresponding failure faults include unintended release of the parking brake. The follow-up measures include entering the parking brake control.

[0012] Third state: The gear shift lever is switched to the non-parking position. The corresponding failure faults include electrical faults in releasing the parking brake, sensor faults, and failure to release the parking brake. When an electrical fault in releasing the parking brake occurs, the follow-up measures include ceasing to control the release of the parking brake. When a sensor fault occurs, the follow-up measures include opening the loop to control the release of the parking brake. When a failure to release the parking brake occurs, the follow-up measures include controlling the release of the parking brake.

[0013] Fourth state: The gear shift lever remains in the non-parking position. The corresponding failure faults include unintended entry into the parking brake. The follow-up measures include releasing the parking brake.

[0014] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in this embodiment includes the following steps for entering the parking brake control when a parking brake failure occurs: collecting parking control information and parking control status information, and determining whether entering the parking brake is successful or failed. Specifically, if the parking control status information indicates that the parking brake has been entered, then the parking brake control is determined to be successful; if the parking control status information indicates that the parking brake has not been entered, and the number of parking brake response attempts has reached the entry response threshold, then the parking brake control is determined to have failed; if the parking control status information indicates that the parking brake has not been entered, and the number of parking brake response attempts has not reached the entry response threshold, then the parking brake control continues.

[0015] When a parking brake release failure occurs, the parking brake release control steps include: collecting parking control information and parking control status information, and determining whether the parking brake release was successful or failed. If the parking control status information indicates that the parking brake has been released, the parking brake release control is considered successful. If the parking control status information indicates that the parking brake has not been released, and the number of parking brake release response counts has reached the release response threshold, the parking brake release control is considered failed. If the parking control status information indicates that the parking brake has not been released, and the number of parking brake release response counts has not reached the release response threshold, the parking brake release control continues.

[0016] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in the embodiment of the present invention has an entry response threshold and a release response threshold of 3 times.

[0017] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in the present invention includes the following steps for entering parking brake control when an unintended release parking brake failure occurs: collecting parking control status information and determining whether entering parking brake is successful or unsuccessful. If the parking control status information indicates that parking brake has been entered, then the entry into parking brake control is determined to be successful; if the parking control status information indicates that parking brake has not been entered, then the entry into parking brake control is determined to be unsuccessful, and post-processing measures are performed as a failure to enter parking brake.

[0018] When an unexpected parking brake failure occurs, the steps for releasing the parking brake include: collecting parking control status information and determining whether the parking brake release was successful. If the parking control status information indicates that the parking brake has been released, the parking brake release control is considered successful; if the parking control status information indicates that the parking brake has not been released, the parking brake release control continues.

[0019] According to another specific embodiment of the present invention, the failure management method of the electronic parking system disclosed in the embodiment of the present invention, when it is determined that the entry into parking brake control has failed, sets the gear shift lever to the parking position and requests the electronic parking brake system to control the parking brake.

[0020] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in the embodiment of the present invention further includes: the vehicle issuing a prompt message to remind the driver based on the failure fault and the follow-up measures; wherein the prompt message includes displaying the gear position or flashing the gear position prompt at the gear position display position on the instrument panel.

[0021] According to another specific embodiment of the present invention, the failure management method of the electronically controlled parking system disclosed in the embodiment of the present invention further includes displaying text on the dashboard to indicate the occurrence of a failure.

[0022] According to another specific embodiment of the present invention, the failure management method for the electronically controlled parking system disclosed in the embodiment of the present invention further includes issuing a warning sound as a prompt.

[0023] The beneficial effects of this invention are:

[0024] The failure management method for the electronically controlled parking system provided by this invention classifies the failure modes of the electronically controlled parking system according to its structure and failure consequences. Different post-processing measures are adopted for different categories of failure modes, improving vehicle availability under failure modes while ensuring vehicle safety, and optimizing the overall performance of the vehicle in terms of availability and safety. Furthermore, in some embodiments, based on the high or low configuration of the instrument panel, information such as text, warning sounds, and gear position displays on the instrument panel effectively reminds the driver, improving driving safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the electronic parking system.

[0026] Figure 2 A flowchart of the steps for controlling the entry into parking brake when an entry into parking brake failure occurs in the failure management method of the electronically controlled parking system provided by the present invention.

[0027] Figure 3 The flowchart illustrates the steps for controlling the release of the parking brake when a failure to release the parking brake occurs in the failure management method for the electronically controlled parking system provided by this invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1: Controller; 2: Parking electromagnet; 21: Gear locking pin; 3: Parking unlocking solenoid valve; 4: Parking drive cylinder; 41: Drive piston; 42: Elastic element; 5: Control lever; 6: Parking position sensor; 7: Parking pawl; 8: Parking gear; 9: Other controllers; 10: Instrument. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0031] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0034] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0036] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0038] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] This invention provides a failure management method for an electronically controlled parking system, which is implemented through a controller in the vehicle.

[0040] To make the method of this invention clearer, the configuration of the controller-controlled electric parking system and the parking control process will be described. For example... Figure 1 As shown, the electronic parking system includes a controller 1, a parking electromagnet 2 and a parking unlock solenoid valve 3 connected to the controller 1, a parking drive cylinder 4 connected to the parking electromagnet 2 and the parking unlock solenoid valve 3, a control lever 5 connected to the parking drive cylinder 4 and a parking position sensor 6, a parking pawl 7 connected to the control lever 5, and a parking gear 8.

[0041] When controller 1 performs the parking brake (P) control, the parking electromagnet 2 is activated. The magnetic force generated by the parking electromagnet 2 lifts the gear locking pin 21, releasing the position lock of the drive piston 41 in the parking drive cylinder 4. Under the spring force of the elastic element 42 in the parking drive cylinder 4, the drive piston 41 moves in the direction of entering the parking brake (P), and pushes the parking pawl 7 into the tooth groove of the parking gear 8 through the control lever 5, thus realizing the entry of the parking brake.

[0042] When controller 1 performs the parking brake release (P) control, controller 1 controls the parking unlock solenoid valve 3 to open, supplying pressurized oil to the parking drive cylinder 4. When the oil pressure reaches the set value, the drive piston 41 in the parking drive cylinder 4 is subjected to oil pressure, overcoming the elastic force of the elastic element 42 and moving in the direction of releasing the parking brake (P). Through the control lever 5, the parking pawl 7 is pulled out of the groove of the parking gear 8, and the drive piston 41 moves to the gear locking pin 21 locking position. The gear locking pin 21 locks the position of the drive piston 41, realizing the release of the parking brake.

[0043] The parking position sensor 6 is installed on the parking drive cylinder 4 to detect the position of the drive piston 41 and feed the position signal back to the controller 1.

[0044] Specifically, controller 1 can be a transmission controller (TCU), a shift controller (SCU), or a chassis controller. The specific settings depend on the braking control method, etc. For example, if electro-hydraulic parking is used, controller 1 can be a TCU or a chassis controller; if electric motor parking is used, controller 1 can be a TCU, an SCU, or a chassis controller.

[0045] At the same time, such as Figure 1 As shown, controller 1 is also connected to other related controllers 9 via an automotive communication network, such as a CAN bus, for signal transmission. For example, in a specific embodiment employing electro-hydraulic parking control, controller 1 is specifically a TCU, and other controllers 9 include SCUs. The TCU is connected to the SCU via a CAN bus, and the SCU can transmit handle signals to the TCU to send driver commands. Controller 1 can also be connected to the automotive instrument cluster 10 (IPK) via a CAN bus, etc., to display management process-related information on the automotive instrument cluster 10, such as fault type, after-treatment status, gear information, and warning messages.

[0046] The failure management method for the electronic parking system provided by the present invention includes: firstly, classifying the failure faults of the electronic parking system according to the structure and failure consequences of the electronic parking system, into electrical faults, sensor faults, failure faults and undesirable faults; the failures caused by these faults include failure to control the entry of the parking brake (P) or failure to control the release of the parking brake (P).

[0047] Electrical faults refer to the failure of the electronic parking system caused by electrical faults in the electronic parking system. Specifically, it can be judged based on the characteristics of the control execution components (solenoid valves / electromagnets), the signals received by the interface circuit between the control execution components and controller 1, etc. If the signals received by controller 1 are not within the normal range defined by the specification, it indicates that there is a short circuit, open circuit, or drive chip failure, etc., and then it is judged that an electrical fault has occurred.

[0048] Sensor failure refers to the failure of the electronic parking system caused by a malfunction of the parking position sensor. Specifically, it can be determined based on the characteristics of the parking position sensor and the signals received by the interface circuit between the parking position sensor and controller 1. If the sensor signal received by controller 1 is not within the normal range defined by the sensor specification, it is determined that a sensor failure has occurred.

[0049] A failure is a fault that occurs when it is determined that no electrical or sensor fault has occurred, but the control fails to engage or release the parking brake.

[0050] Unintended failures refer to the malfunction of the electronic parking system caused by unexpected abnormal operation when no electrical or sensor faults have been determined to have occurred. For example, if the vehicle's handle position and the drive piston position in the electronic parking system indicate that the vehicle is in the released parking brake state, but no parking control is performed, but the vehicle engages the parking brake, and the parking sensor position changes from the released parking brake state to the engaged parking brake state, then an unexpected failure has occurred, specifically an unexpected parking brake engagement failure; conversely, an unexpected parking brake release failure.

[0051] Software such as PLATO is used to perform Failure Mode and Effects Analysis (FMEA) on each type of failure. Based on the FMEA analysis, corresponding post-processing measures are determined for each type of failure. Post-processing measures for electrical failures include discontinuing parking control; post-processing measures for sensor failures include discontinuing parking control or implementing open-loop parking control; post-processing measures for failed failures include implementing parking control; and post-processing measures for undesired failures include implementing parking control. Parking control involves either entering the parking brake (P) or releasing the parking brake (P) control, with the specific control determined based on the vehicle's condition. Furthermore, when an electrical failure occurs, continuing parking control may render the vehicle unusable; therefore, parking control is discontinued to ensure vehicle availability.

[0052] By adopting the above scheme, the failure modes of the electronic parking system are classified according to its composition and failure consequences. Different post-processing measures are adopted for different categories of failure modes. While ensuring vehicle safety, the availability of the vehicle under failure modes is improved, and the overall performance of the vehicle in terms of availability and safety is optimized.

[0053] According to another specific embodiment of the present invention, electrical faults include electrical faults in entering the parking brake (P) and electrical faults in releasing the parking brake (P); failure faults include failures in entering the parking brake (P) and failures in releasing the parking brake (P); and undesirable faults include undesirable failures in entering the parking brake (P) and undesirable failures in releasing the parking brake (P). Wherein, an electrical fault in entering the parking brake (P) refers to an electrical fault that causes the inability to control the entry of the parking brake, and an electrical fault in releasing the parking brake (P) refers to an electrical fault that causes the inability to control the release of the parking brake.

[0054] Specifically, according to this embodiment, the failure classification of the electronically controlled parking system is shown in Table 1.

[0055] Table 1

[0056]

[0057]

[0058] According to another specific embodiment of the present invention, the failure management method further includes: performing failure mode and effect analysis (FMEA) on each type of failure, and classifying the state of the vehicle's gear shift lever when the failure occurs based on the failure mode and effect analysis, wherein the state of the gear shift lever includes the following four states.

[0059] First state: The gear shift lever is switched to Park (P). Corresponding faults include P-entry electrical fault, P-exit electrical fault, sensor fault, and P-entry failure fault. When a P-entry electrical fault, P-exit electrical fault, or sensor fault occurs, the follow-up measures include ceasing P-entry control. When a P-entry failure fault occurs, the follow-up measures include attempting P-entry control. However, when an P-exit electrical fault or sensor fault occurs, P-entry control is discontinued to ensure normal vehicle operation.

[0060] Second state: The gear shift lever remains in the parking position. The corresponding failure faults include unexpected exit from P. The follow-up measures include entering P control.

[0061] The third state: The gear shift lever is switched to non-parking gear. Corresponding failures include electrical faults in exiting Parking (P), sensor faults, and failure to exit Parking (P) faults. Specifically, when an electrical fault occurs in exiting Parking (P), the follow-up measures include ceasing P exit control; when a sensor fault occurs, the follow-up measures include opening-loop P exit control; when a failure to exit Parking (P) occurs, the follow-up measures include performing P exit control. However, in the case of a sensor fault, to ensure normal vehicle operation, open-loop P exit control is performed.

[0062] Fourth state: The gear shift lever remains in the non-parking position. The corresponding failure faults include unexpected P-entry faults. For the sake of normal vehicle operation, the follow-up measures include P-out control.

[0063] According to another specific embodiment of the present invention, the failure management method further includes: when a parking control failure occurs, the parking control step includes: collecting parking control information and parking control status information, and determining whether the parking control failure is successful or unsuccessful.

[0064] Specifically, in the first state, such as Figure 2 As shown, when the gear shift lever is switched to P gear, the system determines whether P is engaged based on the parking control status information collected and transmitted by the parking sensors. If the parking control status information indicates that P is engaged, the P engagement control is considered successful. If the parking control status information indicates that P is not engaged, it indicates a P engagement failure. The fault type is determined, and if it is determined to be a P engagement failure, an exit P control is performed first, followed by a P engagement control. The system then determines whether P is engaged based on the parking control information collected by the parking sensors. If the parking control status information indicates that P is engaged, the P engagement control is considered successful, the fault post-processing state is cleared, and the system enters normal operation. If the parking control status information indicates that P is not engaged, the system further determines whether the number of P engagement responses has reached the engagement response threshold based on the collected parking control information. If the number of P engagement responses reaches the engagement response threshold, the P engagement control is considered a failure. If the parking control status information indicates that P is not engaged, and the number of P engagement responses has not reached the engagement response threshold, an exit P control is performed first, followed by a P engagement control, and the P engagement response count is incremented by 1.

[0065] When a parking control failure occurs, the parking control steps include: collecting parking control information and parking control status information, and determining whether the parking control was successful or failed.

[0066] Specifically, in the third state, such as Figure 3As shown, when the gear shift lever is switched to a non-P gear, the parking control status information collected and transmitted by the parking sensor is used to determine whether P has been disengaged. If the parking control status information indicates that P has been disengaged, the P disengagement control is considered successful. If the parking control status information indicates that P has not been disengaged, it indicates that P disengagement has failed. The fault type is determined. After confirming that P disengagement has failed, a P-entry control is performed first to attempt P disengagement control. The parking control information collected by the parking sensor is used to determine whether P has been disengaged. If the parking control status information indicates that P has been disengaged, the P disengagement control is considered successful, the fault post-processing state is cleared, and normal state is entered. If the parking control status information indicates that P has not been disengaged, the number of P disengagement responses is further determined based on the collected parking control information to see if the release response threshold has been reached. If the number of P disengagement responses reaches the release response threshold, the P disengagement control is considered to have failed. If the parking control status information indicates that P has not been disengaged, and the number of P disengagement responses has not reached the release response threshold, a P-entry control is performed first, followed by a P disengagement control, and the number of P disengagement responses is incremented by 1.

[0067] Among them, collecting parking control information refers to counting the number of times the parking braking procedure occurs. Each time the P control procedure is completed, the number of P control responses is incremented by 1.

[0068] Collecting parking control status information refers to collecting information on whether the vehicle is actually in or out of the P state. For example, if the vehicle can move normally when the gear shift lever is switched to a non-parking gear, such as drive (D) or reverse (R), it indicates that it is out of the P state; if the vehicle cannot move normally, it indicates that it is not out of the P state. When the gear shift lever is switched to the parking gear (P), if the vehicle cannot move, it indicates that it is in the P state; if the vehicle can still move, it indicates that it is not in the P state.

[0069] The entry response threshold and release response threshold are determined based on the control time and specific needs, and can be set to 3, 4, 5, etc.

[0070] According to another specific embodiment of the present invention, both the entry response threshold and the release response threshold are 3 times.

[0071] According to another specific embodiment of the present invention, when an unexpected parking exit fault occurs, the parking exit control step includes: collecting parking control status information and determining whether the parking exit was successful or failed. If the parking control status information indicates that the parking exit has been completed, the parking exit control is considered successful, the fault post-processing state is lifted, and the vehicle enters a normal state. If the parking control status information indicates that the parking exit has not been completed, the parking exit control is considered failed, and corresponding post-processing measures are implemented as a parking exit failure fault. When an unexpected parking exit fault occurs, the parking exit control step includes: collecting parking control status information and determining whether the parking exit was successful. If the parking control status information indicates that the parking exit has been completed, the parking exit control is considered successful; if the parking control status information indicates that the parking exit has not been completed, the parking exit control continues until the parking exit is successful, or until a certain period of time has elapsed.

[0072] According to another specific embodiment of the present invention, for safety reasons, when performing the P-entry control step, if it is determined that the P-entry control has failed, the shift lever is placed in the parking position, and the electronic parking brake system (EPB) is requested to control the parking brake.

[0073] It should be noted that when performing the P control step, after determining that the P control is successful, it is also necessary to ensure that the gear shift lever is switched to Park (P) or Neutral (N) or that the vehicle is in another safe state before allowing the post-fault handling state to be released and the vehicle to enter normal state, in order to ensure vehicle safety. Other safe states may specifically include: the driver pressing the brake pedal, EPB being engaged, and AutoHold being activated.

[0074] Based on the above, the failure management method provided by the present invention, the failure classification of the electronically controlled parking system, and the corresponding post-processing and safety measures are shown in Table 2.

[0075] Table 2

[0076]

[0077]

[0078] According to another specific embodiment of the present invention, the failure management method further includes: the vehicle issuing a prompt message to remind the driver based on the failure fault and the follow-up measures; wherein the prompt message includes displaying the gear position or a flashing gear position prompt at the gear position display position on the instrument panel.

[0079] Specifically, vehicle dashboards can have different configurations, with the lower configuration supporting basic gear display, including P, R, N, D, S, and the specific gear in manual mode. The higher configuration supports basic gear display and can provide text prompts, sound prompts, and flashing gear indicator. Both configurations can display the gear position or provide a flashing gear indicator on the dashboard to alert the driver.

[0080] Existing failure management methods offer limited and simple interaction with the driver after a failure and subsequent handling, potentially failing to provide adequate alerts. The proposed solution effectively alerts the driver through information such as the gear position display on the dashboard.

[0081] According to another specific embodiment of the present invention, the prompting information further includes displaying text on the high-end instrument panel indicating a failure. According to another specific embodiment of the present invention, the prompting information further includes emitting a warning sound on the high-end instrument panel.

[0082] Specifically, the failure management method, post-processing measures of the electronic parking system, and vehicle warning information provided by the present invention are shown in Table 3.

[0083] Table 3

[0084]

[0085]

[0086] In Table 3, the threshold is the maximum speed at which a car can brake. The specific value varies for different vehicles and can range from 2 to 8 km / h, for example, 5 km / h.

[0087] Using the above solution, the driver is effectively alerted through text, warning sounds, gear position display, and other information on the dashboard, depending on whether the dashboard is high-end or low-end.

[0088] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A failure management method for an electronically controlled parking system, characterized in that, The failure management method includes: The failures of the electronically controlled parking system are classified into electrical faults, sensor faults, failures, and unexpected faults. Failure mode and effect analysis (FMEA) is performed on each type of failure, and post-treatment measures are determined based on the FMEA analysis; wherein, The post-fault handling measures for the electrical fault include ceasing parking control. The post-processing measures for the sensor failure include ceasing the parking control or performing the parking control in an open-loop manner; The post-processing measures for the failure include performing the parking control; The post-processing measures for the unintended fault include performing the parking control; wherein, The parking control refers to either entering parking brake control or releasing parking brake control. The electrical faults include electrical faults when engaging the parking brake and electrical faults when releasing the parking brake. The failures include failure to engage the parking brake and failure to release the parking brake. The unintended faults include unintended entry into the parking brake and unintended release of the parking brake. The failure management method further includes: performing failure mode and effect analysis on each type of failure, and classifying the state of the vehicle's gear shift lever when the failure occurs based on the failure mode and effect analysis, wherein the state of the gear shift lever includes: First state: The gear shift lever is switched to the parking position. The corresponding failures include electrical faults in the parking brake engagement, electrical faults in the parking brake release, sensor faults, and parking brake engagement failures. When the aforementioned electrical fault in the parking brake engagement, the parking brake release, or the sensor malfunction occurs, the post-processing measures include ceasing parking brake engagement control. When the failure to engage the parking brake occurs, the follow-up measures include performing the parking brake control. Second state: The gear shift lever is kept in the parking position, the corresponding failure includes the unintended release of the parking brake failure, and the post-processing measures include performing the entry into the parking brake control. Third state: The gear shift lever is switched to the non-parking position. The corresponding failures include electrical faults in the parking brake release, sensor faults, and parking brake release failures. When the aforementioned electrical fault in releasing the parking brake occurs, the post-processing measures include ceasing the control of releasing the parking brake. When the sensor malfunctions, the post-processing measures include performing the release parking brake control in an open-loop manner; When the failure to release the parking brake occurs, the follow-up measures include performing the parking brake release control. Fourth state: The gear shift lever remains in the non-parking position. The corresponding failure includes the unexpected entry into the parking brake failure. The post-processing measures include performing the parking brake release control.

2. The failure management method for the electronically controlled parking system as described in claim 1, characterized in that, When the aforementioned failure to engage the parking brake occurs, the steps for controlling the engagement of the parking brake include: Collect parking control information and parking control status information to determine whether the parking brake engagement was successful or unsuccessful. If the parking control status information indicates that parking brake has been engaged, then it is determined that parking brake control has been successfully engaged. If the parking control status information indicates that the parking brake has not been engaged, and the number of times the parking brake engagement response has reached the engagement response threshold, then it is determined that the engagement of the parking brake control has failed. If the parking control status information indicates that the parking brake has not been engaged, and the number of times the parking brake engagement response has not reached the engagement response threshold, then the parking brake engagement control will continue. When the parking brake release failure occurs, the parking brake release control steps include: Collect the parking control information and the parking control status information to determine whether the parking brake release was successful or unsuccessful. If the parking control status information indicates that the parking brake has been released, then it is determined that the parking brake release control was successful. If the parking control status information indicates that the parking brake has not been released, and the number of times the parking brake release response has reached the release response threshold, then it is determined that the parking brake release control has failed. If the parking control status information indicates that the parking brake has not been released, and the number of times the parking brake release response has not reached the release response threshold, then the parking brake release control will continue.

3. The failure management method for the electronically controlled parking system as described in claim 2, characterized in that, Both the entry response threshold and the release response threshold are 3 times.

4. The failure management method for the electronically controlled parking system as described in claim 2, characterized in that, When the aforementioned unintended release of the parking brake malfunction occurs, the steps for entering the parking brake control include: Collect the parking control status information to determine whether the parking brake engagement was successful or failed. If the parking control status information indicates that the parking brake has been engaged, then it is determined that the parking brake control has been successfully engaged. If the parking control status information indicates that the parking brake has not been engaged, it is determined that the engagement of the parking brake control has failed, and this is treated as a failure to engage the parking brake, and the post-processing measures are performed accordingly. When the aforementioned unintended parking brake activation failure occurs, the parking brake release control steps include: Collect parking control status information to determine whether the parking brake release was successful. If the parking control status information indicates that the parking brake has been released, then it is determined that the parking brake release control was successful. If the parking control status information indicates that the parking brake has not been released, then the parking brake release control will continue.

5. The failure management method for the electronically controlled parking system as described in claim 4, characterized in that, When it is determined that the entry into the parking brake control has failed, the shift lever is placed in the parking position, and the electronic parking brake system is requested to control the parking brake.

6. The failure management method for the electronically controlled parking system as described in any one of claims 1-5, characterized in that, The failure management method further includes: based on the failure and the post-processing measures, the vehicle issues a warning message to remind the driver; wherein... The prompt information includes displaying the gear position or a flashing gear position indicator in the instrument panel gear display location.

7. The failure management method for the electronically controlled parking system as described in claim 6, characterized in that, The notification message also includes displaying text on the dashboard indicating that the failure has occurred.

8. The failure management method for the electronically controlled parking system as described in claim 7, characterized in that, The notification message also includes emitting a warning sound.

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