A vehicle grounding monitoring and lifting method based on an air suspension system

Abstract

This invention relates to a vehicle bottoming-out monitoring and lifting method based on an air suspension system, comprising the following specific steps: S1: Determine the vehicle's motion state based on the vehicle's actual gear position and speed. If the vehicle's actual gear is P and the speed is less than a preset threshold, then the vehicle is determined to be static; S2: Identify the vehicle's motion state, determine whether the vehicle is static, whether the received height gear has decreased, whether the air suspension needs height reduction adjustment, whether the motor and solenoid valve are working properly, and whether there are no faults or overheating. If all the above conditions are met, proceed to the next step; otherwise, terminate directly. This invention has the characteristics of improving system stability and robustness, avoiding misjudgment, and ensuring vehicle safety.

Description

Technical Field

[0001] This invention relates to the field of vehicle bottoming-out monitoring technology, and in particular to a method for monitoring and lifting vehicle bottoming-out based on an air suspension system. Background Technology

[0002] With significant advancements in domestic air suspension technology and cost reductions through localization, market demand for air suspension systems has further expanded. Air suspension systems enable adjustable vehicle height, providing consumers with a more comfortable driving experience and facilitating easy entry and exit, as well as easy loading and unloading. However, adjustable vehicle height also brings some potential problems. For example, if the driver parks the vehicle over a protruding obstacle and activates the convenient entry / exit or convenient loading mode, the vehicle may run over the obstacle during the height adjustment process, potentially causing the bottom to scrape. If the driver fails to recognize this and continues driving, it could damage the vehicle's chassis, creating a safety hazard.

[0003] The existing technology uses a method that, in response to a command to lower the vehicle height, detects and compares the airbag deflation rate at a preset time in the air spring system with a preset deflation rate threshold to determine whether the vehicle is in a bottoming-out state. If the airbag deflation rate at the preset time is less than the preset threshold, it is immediately considered that the vehicle is in a bottoming-out state. However, this method has the following problems: 1. It responds to the user-triggered vehicle height lowering command, but this premise does not take into account whether the user's lowering operation command was successfully issued, nor does it take into account the actual working status of the motor and solenoid valve in the air suspension system. Suppose the user performs a lowering operation on the vehicle's large screen, but the lowering command is not issued; or the lowering command is issued normally, but the motor or solenoid valve in the air suspension system is not actually working, then it will incorrectly judge that the vehicle has entered the bottoming state; 2. Affected by many factors such as ambient temperature, vehicle load, and height sensor characteristics, the airbag deflation rate may be very low at a certain moment. Judging that the vehicle is in the bottoming state based solely on the airbag deflation rate being less than a threshold at a certain moment can easily lead to situations where the vehicle has not bottomed out but has entered the bottoming state incorrectly. The system has poor stability and robustness, affecting the user's normal use and functional experience of the air suspension system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for monitoring and lifting a vehicle undercarriage based on an air suspension system, which has the characteristics of improving system stability and robustness, avoiding misjudgment, and ensuring vehicle safety.

[0005] The technical solution adopted by this invention to solve its technical problem is: to provide a method for monitoring and lifting a vehicle undercarriage based on an air suspension system, including the following specific steps:

[0006] S1: Determine the vehicle's motion state based on its actual gear position and speed. If the vehicle's actual gear is P and its speed is less than a preset threshold, then determine that the vehicle is in a static state.

[0007] S2: Identify the vehicle's motion status, determine whether the vehicle is static, whether the height gear has been lowered, whether the air suspension needs height adjustment, whether the motor and solenoid valve are working properly, and whether there are no faults or overheating. If all of the above conditions are met, proceed to the next step; otherwise, end directly.

[0008] S3: The timer starts counting from zero and records the current air suspension height as H1, where H1 is a preset threshold.

[0009] S4: When the vehicle is determined to be static, the height setting is lowered, and the air suspension height is adjusted, a timer is started, and a preset time T is determined. While the timer is counting, the air suspension height changes. If the timer has not reached T, it is necessary to determine whether the vehicle is static and has received a lowering adjustment command. If the result is yes, the timer continues to count; otherwise, it ends directly. When the timer reaches the preset time T, the change in air suspension height controlled by lowering during the time period T is recorded as parameter H2. The height difference ΔH between height H2 and height H1 is calculated, where ΔH = H1 - H2.

[0010] S5: Determine whether ΔH is less than the preset threshold. If yes, proceed to the next step; otherwise, return to step S3.

[0011] S6: Outputs the vehicle's bottoming status. If the vehicle is confirmed to be in a bottoming state, it sends a command to prohibit the air suspension from lowering the height and prompts the driver to manually raise the air suspension to the appropriate height via the central control screen.

[0012] S7: When the driver manually raises the vehicle or the air suspension system automatically raises the vehicle when starting, the central control screen will cancel the output of the vehicle bottoming status; otherwise, the central control screen will always display that the vehicle is in the bottoming status.

[0013] In step S2, the air suspension of the four wheels is monitored in real time. When the descent command is DOWN_FL, the height change of the left front (FL) is monitored during the time period T. When the descent command is DOWN_FR, the height change of the right front (FR) is monitored during the time period T. When the descent command is DOWN_FA (front axle), the height changes of the left front and right front are monitored simultaneously during the time period T. This can accurately determine the position where the vehicle bottoms out.

[0014] In the S6, once the air suspension system controller detects that the vehicle has bottomed out, it will prevent the height adjustment from being lowered. At the same time, it will transmit the bottoming out status to the central control screen via the vehicle's CAN communication. After receiving the bottoming out status sent by the air suspension controller, the central control screen will display a text reminder, and the text reminder will not be subject to any special restrictions.

[0015] In step S7, after determining whether the vehicle has triggered bottoming out or the bottoming out state has been released, i.e., after the bottoming out state has changed, the bottoming out state will be immediately stored in non-volatile memory. When the vehicle is powered on again, the state when the vehicle was powered off will be read from the memory.

[0016] When the air suspension system receives a change in the target height setting, it remembers the previous target height setting. For example, when the target height setting changes from "Standard" to "Lower", the air suspension system will remember "Standard". When the vehicle bottoms out during descent, the air suspension system will gray out "Lower" and lower settings, leaving only "Standard" and higher settings available. When it receives "Standard" and higher settings, it controls the air suspension system to raise the height. After the height increase is complete, it clears the bottoming-out status and restores the grayed-out air suspension height setting button to be selectable.

[0017] When the system detects that the vehicle is bottoming out, and monitors the vehicle's actual gear position changes from P to another gear, it indicates that the driver is preparing to start. At this time, the air suspension system will automatically raise the vehicle height to the previously memorized target height gear.

[0018] Once it is determined that the vehicle has triggered bottoming out or the bottoming out state has been resolved, i.e., the bottoming out state has changed, the bottoming out state will be immediately stored in non-volatile memory. When the vehicle is powered on again, the state when the vehicle was powered off will be read from the memory.

[0019] The system identifies the vehicle's motion state. When the vehicle is stationary, it simultaneously monitors the height descent command and the operational status of the motors and corresponding solenoid valves in the air suspension system. If all three conditions are met, a timer begins. Within a preset time period, the system monitors the height the air suspension descends according to the command. If the descent is less than or equal to a preset threshold, the vehicle is determined to be in a bottoming-out state. The air suspension height signal is processed using a low-pass filter to eliminate interference from height signal fluctuations. This method improves the stability and robustness of the air suspension system's vehicle bottoming-out detection, avoiding erroneous judgments that the vehicle has bottomed out.

[0020] By monitoring the commands for air suspension descent at each of the four wheels, the operating status of the corresponding solenoid valves, and the corresponding changes in the air suspension descent height, this method can identify which location the bottoming out occurred and alert the driver, enabling the driver to find the obstacle more quickly when getting out of the vehicle to inspect it.

[0021] Upon detecting that the vehicle has bottomed out, the system first sends a command to prevent the air suspension height from lowering further. Then, a message appears on the center console screen stating that the vehicle has bottomed out and requesting manual height adjustment. Simultaneously, the current and lower height settings are grayed out on the screen, allowing the driver to only select higher height settings to prevent accidental operation. Once the driver's lifting operation is detected, the message on the center console screen is cleared, and the height adjustment buttons are restored. This method allows the driver to clearly perceive that the vehicle has bottomed out and promptly get out to check the vehicle's condition.

[0022] If the driver fails to see the text prompt due to negligence, a lift control command will be automatically sent to the air suspension system when the driver prepares to start the vehicle. This will cause the air suspension system to automatically raise its height, clear the text prompt on the central control screen, and restore the height setting button. This method can automatically raise the vehicle's air suspension height even when the vehicle has bottomed out and there is no driver intervention, preventing damage to the vehicle chassis and ensuring driving safety.

[0023] Upon detecting a vehicle bottoming out, the system immediately stores this information in memory. This information is retained even after a power outage. When the vehicle is powered back on, the air suspension system reads the memory data. If the stored information indicates bottoming out, a text prompt will appear on the central control screen, and non-adjustable buttons will be grayed out. This immediate storage method ensures accurate identification of whether the vehicle is in a bottoming-out state after power-on in various scenarios, including normal power-off, abnormal power outage, battery power failure, or software upgrades. Furthermore, this method can be used even if bottoming out is detected but the driver is unaware and powers off the vehicle, prompting them to manually raise the air suspension upon returning to the vehicle, or automatically raising the air suspension when the driver attempts to start moving.

[0024] Beneficial effects: This invention relates to a method for monitoring and lifting a vehicle undercarriage based on an air suspension system, which has the characteristics of improving system stability and robustness, avoiding misjudgment, and ensuring vehicle safety. Attached Figure Description

[0025] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0027] The embodiments of the present invention relate to a method for monitoring and lifting a vehicle undercarriage based on an air suspension system, comprising the following specific steps:

[0028] S1: Determine the vehicle's motion state based on its actual gear position and speed. If the vehicle's actual gear is P and its speed is less than a preset threshold, then determine that the vehicle is in a static state.

[0029] S2: Identify the vehicle's motion status, determine whether the vehicle is static, whether the height gear has been lowered, whether the air suspension needs height adjustment, whether the motor and solenoid valve are working properly, and whether there are no faults or overheating. If all of the above conditions are met, proceed to the next step; otherwise, end directly.

[0030] S3: The timer starts counting from zero and records the current air suspension height as H1, where H1 is a preset threshold.

[0031] S4: When the vehicle is determined to be static, the height setting is lowered, and the air suspension height is adjusted, a timer is started, and a preset time T is determined. While the timer is counting, the air suspension height changes. If the timer has not reached T, it is necessary to determine whether the vehicle is static and has received a lowering adjustment command. If the result is yes, the timer continues to count; otherwise, it ends directly. When the timer reaches the preset time T, the change in air suspension height controlled by lowering during the time period T is recorded as parameter H2. The height difference ΔH between height H2 and height H1 is calculated, where ΔH = H1 - H2.

[0032] S5: Determine whether ΔH is less than the preset threshold. If yes, proceed to the next step; otherwise, return to step S3.

[0033] S6: Outputs the vehicle's bottoming status. If the vehicle is confirmed to be in a bottoming state, it sends a command to prohibit the air suspension from lowering the height and prompts the driver to manually raise the air suspension to the appropriate height via the central control screen.

[0034] S7: When the driver manually raises the vehicle or the air suspension system automatically raises the vehicle when starting, the central control screen will cancel the output of the vehicle bottoming status; otherwise, the central control screen will always display that the vehicle is in the bottoming status.

[0035] In step S2, the air suspension of the four wheels is monitored in real time. When the descent command is DOWN_FL, the height change of the left front (FL) is monitored during the time period T. When the descent command is DOWN_FR, the height change of the right front (FR) is monitored during the time period T. When the descent command is DOWN_FA (front axle), the height changes of the left front and right front are monitored simultaneously during the time period T. This can accurately determine the position where the vehicle bottoms out.

[0036] In the S6, once the air suspension system controller detects that the vehicle has bottomed out, it will prevent the height adjustment from being lowered. At the same time, it will transmit the bottoming out status to the central control screen via the vehicle's CAN communication. After receiving the bottoming out status sent by the air suspension controller, the central control screen will display a text reminder, and the text reminder will not be subject to any special restrictions.

[0037] In step S7, after determining whether the vehicle has triggered bottoming out or the bottoming out state has been released, i.e., after the bottoming out state has changed, the bottoming out state will be immediately stored in non-volatile memory. When the vehicle is powered on again, the state when the vehicle was powered off will be read from the memory.

[0038] When the air suspension system receives a change in the target height setting, it remembers the previous target height setting. For example, when the target height setting changes from "Standard" to "Lower", the air suspension system will remember "Standard". When the vehicle bottoms out during descent, the air suspension system will gray out "Lower" and lower settings, leaving only "Standard" and higher settings available. When it receives "Standard" and higher settings, it controls the air suspension system to raise the height. After the height increase is complete, it clears the bottoming-out status and restores the grayed-out air suspension height setting button to be selectable.

[0039] When the system detects that the vehicle is bottoming out, and monitors the vehicle's actual gear position changes from P to another gear, it indicates that the driver is preparing to start. At this time, the air suspension system will automatically raise the vehicle height to the previously memorized target height gear.

[0040] Once it is determined that the vehicle has triggered bottoming out or the bottoming out state has been resolved, i.e., the bottoming out state has changed, the bottoming out state will be immediately stored in non-volatile memory. When the vehicle is powered on again, the state when the vehicle was powered off will be read from the memory.

Claims

1. A method for monitoring and lifting a vehicle undercarriage based on an air suspension system, characterized in that: The specific steps include the following: S1: Determine the vehicle's motion state based on its actual gear position and speed. If the vehicle's actual gear is P and its speed is less than a preset threshold, then determine that the vehicle is in a static state. S2: Identify the vehicle's motion status, determine whether the vehicle is static, whether the height gear has been lowered, whether the air suspension needs height adjustment, whether the motor and solenoid valve are working properly, and whether there are no faults or overheating. If all of the above conditions are met, proceed to the next step; otherwise, end directly. S3: The timer starts counting from zero and records the current air suspension height as H1, where H1 is a preset threshold. S4: When the vehicle is determined to be static, the height setting is lowered, and the air suspension height is adjusted, a timer is started, and a preset time T is determined. While the timer is counting, the air suspension height changes. If the timer has not reached T, it is necessary to determine whether the vehicle is static and has received a lowering adjustment command. If the result is yes, the timer continues to count; otherwise, it ends directly. When the timer reaches the preset time T, the change in air suspension height controlled by lowering during the time period T is recorded as parameter H2. The height difference ΔH between height H2 and height H1 is calculated, where ΔH = H1 - H2. S5: Determine whether ΔH is less than the preset threshold. If yes, proceed to the next step; otherwise, return to step S3. S6: Outputs the vehicle's bottoming status. If the vehicle is confirmed to be in a bottoming state, it sends a command to prohibit the air suspension from lowering the height and prompts the driver to manually raise the air suspension to the appropriate height via the central control screen. S7: When the driver manually raises the vehicle or the air suspension system automatically raises the vehicle when starting, the central control screen cancels the output of the vehicle bottoming-out status; otherwise, the central control screen always displays the vehicle bottoming-out status. In step S2, the air suspension of the four wheels is monitored in real time. When the descent command is the left front descent command DOWN_FL, the height change of the left front (FL) is monitored during the time period T. When the descent command is the right front descent command DOWN_FR, the height change of the right front (FR) is monitored during the time period T. When the descent command is the front axle descent command DOWN_FA, the height changes of both the left front and right front are monitored simultaneously during the time period T. This can accurately determine the position where the vehicle bottoms out.

2. The method for monitoring and lifting a vehicle undercarriage based on an air suspension system according to claim 1, characterized in that: In the S6, once the air suspension system controller detects that the vehicle has bottomed out, it will prevent the height adjustment from being lowered. At the same time, it will transmit the bottoming out status to the central control screen via the vehicle's CAN communication. After receiving the bottoming out status sent by the air suspension controller, the central control screen will display a text reminder, and the text reminder will not be subject to any special restrictions.

3. The method for monitoring and lifting a vehicle undercarriage based on an air suspension system according to claim 1, characterized in that: In step S7, after determining whether the vehicle has triggered bottoming out or the bottoming out state has been released, i.e., after the bottoming out state has changed, the bottoming out state will be immediately stored in non-volatile memory. When the vehicle is powered on again, the state when the vehicle was powered off will be read from the memory.

4. The method for monitoring and lifting a vehicle undercarriage based on an air suspension system according to claim 1, characterized in that: When the air suspension system receives a change in the target height setting, it remembers the previous target height setting. When the target height setting changes from "Standard" to "Lower", the air suspension system remembers "Standard". When the vehicle bottoms out during descent, the air suspension system grays out "Lower" and lower settings, leaving only "Standard" and higher settings available. When it receives "Standard" and higher settings, it controls the air suspension system to raise the height. After the height increase is complete, it clears the bottoming out status and restores the grayed-out air suspension height setting button to selectable settings.

5. A method for monitoring and lifting a vehicle undercarriage based on an air suspension system according to claim 4, characterized in that: When the system detects that the vehicle is bottoming out, and monitors the vehicle's actual gear position changes from P to another gear, it indicates that the driver is preparing to start. At this time, the air suspension system will automatically raise the vehicle height to the previously memorized target height gear.

6. The method for monitoring and lifting a vehicle undercarriage based on an air suspension system according to claim 1, characterized in that: Once it is determined that the vehicle has triggered bottoming out or the bottoming out state has been resolved, i.e., the bottoming out state has changed, the bottoming out state will be immediately stored in non-volatile memory. When the vehicle is powered on again, the state when the vehicle was powered off will be read from the memory.

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