CN114379308B - Lifter mode identification method of vehicle air suspension system and air suspension system - Google Patents
Lifter mode identification method of vehicle air suspension system and air suspension system Download PDFInfo
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- CN114379308B CN114379308B CN202111597103.7A CN202111597103A CN114379308B CN 114379308 B CN114379308 B CN 114379308B CN 202111597103 A CN202111597103 A CN 202111597103A CN 114379308 B CN114379308 B CN 114379308B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/052—Pneumatic spring characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
- B60G17/01908—Acceleration or inclination sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides a lifter mode identification method of a vehicle air suspension system, which detects the acceleration change of a vehicle body when the vehicle speed is 0 so as to detect whether the vehicle is on a lifter or not, and activates the lifter mode when judging that the acceleration change of the vehicle body meets the requirement. Compared with the existing lifter mode recognition method based on the height sensor, the lifter mode recognition method is faster in recognition speed, and therefore the technical problem of airbag damage after a vehicle falls to the ground from the lifter due to slow lifter mode recognition can be avoided.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a lifter mode identification method of a vehicle air suspension system and the vehicle air suspension system.
Background
Existing vehicles equipped with air suspension systems typically have a lift mode. When the vehicle is lifted by the lift, the lift mode must be turned on. The lift mode is mainly used to disable the height compensation function of the air suspension. The height compensation function is to adjust the height to the target height by means of inflation or deflation after the actual height of the air suspension exceeds the target height for a certain deviation period. Thus, when the vehicle is not dormant and the air suspension system height compensation function is not disabled, driving the vehicle to the lift and lifting the lift will cause the air suspension system to continue to vent in an effort to restore the suspension height to the target height, resulting in complete air bag evacuation. After the vehicle is completely landed, the air bag will be completely void of air for a period of time, with the consequence that the air bag will be damaged, both by the vertical load directly pressing on the air bag, and by the shear forces to which the air bag is subjected when the lift is driven out.
Therefore, there is a need for automatic identification of the lift mode of an air suspension system. In the prior art, the lifter mode of the air suspension system is identified based on the height sensor, but the problem of slow identification exists, so that when a vehicle is lifted by the lifter, the problem of air bag damage caused by slow identification still exists.
Disclosure of Invention
The invention provides a lifter mode identification method of a vehicle air suspension system and the vehicle air suspension system, which can immediately trigger a lifter mode when a vehicle is lifted by a lifter so as to avoid the technical problem of air bag damage after the vehicle falls to the ground from the lifter caused by slow lifter mode identification.
The lifter pattern recognition method of the vehicle air suspension system provided by the first aspect of the invention is executed by a controller and comprises the following steps:
when the vehicle speed is 0, detecting a lifter mode of the current round;
if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension;
and when the detection values of other vehicle body acceleration sensors are detected to be larger than the preset threshold value in the longest interval time, activating a lifter mode.
As an improvement of the above solution, the method further includes:
in the current round detection, acquiring the seat occupation information of the automobile at intervals of a preset period;
acquiring the current period seat occupying information when the current period is ended;
if the current period occupied seat information is different from the previous period occupied seat information, canceling the monitoring operation of the detection value of the vehicle body acceleration sensor in the next period;
and if the current period seat occupation information is the same as the previous period seat occupation information, monitoring the detection value of the vehicle body acceleration sensor in the next period to judge whether the detection value of the vehicle body acceleration sensor is larger than a preset threshold value.
As an improvement of the above-mentioned scheme, when the detected value of the vehicle body acceleration sensor is detected to be greater than a preset threshold value for the first time in the current round detection, calculating a tire jump speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of the impact on the vehicle body corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jump speed and each current air suspension;
and restarting the detection of the lifting mode when detecting that the detection values of other vehicle body acceleration sensors are not all larger than the preset threshold value in the longest interval time.
As an improvement of the above-mentioned aspect, the step of calculating the tire jump-down speed of the tire corresponding to the vehicle body acceleration sensor specifically includes:
acquiring a first height value through a height sensor, and differentiating the first height value to obtain the tire jumping down speed; the first height value is a height value of an air suspension of a tire corresponding to a vehicle body acceleration sensor, wherein the first detection value of the first height value is larger than a preset threshold value in current round detection.
As an improvement of the above solution, the step of calculating the longest interval time of the impact on the vehicle body corresponding to the other vehicle body acceleration sensor according to the maximum value of the height difference between the tire jump speed and the current air suspension, specifically includes:
the maximum interval time is calculated according to the following formula:
ΔT＝(ΔH _max +h 0 )/v
wherein DeltaT is the longest interval time, deltaH _max Is the maximum value of the height difference value between the current air suspensions, h 0 And v is the tire jumping-down speed, which is the preset relative height difference value of each supporting surface of the lifter.
As an improvement of the above-described aspect, after detecting that the detection value of the vehicle body acceleration sensor is greater than the preset threshold value for the first time in the current round detection, further comprising:
setting the position of a lifter mode mark as 1;
then, after detecting that the detection values of the other vehicle body acceleration sensors are not all greater than the preset threshold value in the longest interval time, the method further includes:
and setting the position of the lifter mode flag to be 0.
A second aspect of the invention provides a vehicle air suspension system comprising a controller configured to:
when the vehicle speed is 0, detecting a lifter mode of the current round;
if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension;
and when the detection values of other vehicle body acceleration sensors are detected to be larger than the preset threshold value in the longest interval time, activating a lifter mode.
As an improvement of the above, the controller is further configured to:
in the current round detection, acquiring the seat occupation information of the automobile at intervals of a preset period;
acquiring the current period seat occupying information when the current period is ended;
if the current period occupied seat information is different from the previous period occupied seat information, canceling the monitoring operation of the detection value of the vehicle body acceleration sensor in the next period;
and if the current period seat occupation information is the same as the previous period seat occupation information, monitoring the detection value of the vehicle body acceleration sensor in the next period to judge whether the detection value of the vehicle body acceleration sensor is larger than a preset threshold value.
As an improvement of the above, the controller is further configured to:
and restarting the detection of the lifting mode when detecting that the detection values of other vehicle body acceleration sensors are not all larger than the preset threshold value in the longest interval time.
Compared with the prior art, the lifter mode identification method of the vehicle air suspension system and the air suspension system have the following beneficial effects:
the lifter mode identification method of the vehicle air suspension system comprises the steps of detecting a lifter mode of a current round when the vehicle speed is 0; if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension; and when the detection values of other vehicle body acceleration sensors are detected to be larger than the preset threshold value in the longest interval time, activating a lifter mode. According to the invention, when the vehicle speed is 0, the vehicle body acceleration change is detected to detect whether the vehicle is on the lifter, so that when the vehicle body acceleration change is judged to meet the requirement, the lifter mode is activated. Compared with the existing lifter mode recognition method based on the height sensor, the lifter mode recognition speed is higher, so that the technical problem of air bag damage after a vehicle falls from the lifter due to slow lifter mode recognition can be avoided.
Drawings
Fig. 1 is a schematic flow chart of a lifter pattern recognition method of a vehicle air suspension system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Existing automobiles equipped with air suspension systems generally have a lifter mode that is turned on mainly when the automobile is lifted by the lifter. However, the prior art is generally based on lift pattern recognition by a height sensor. The lifter mode identification method based on the height sensor has the problem of slow identification, and can not automatically identify that the automobile is on the lifter immediately when the automobile starts to be lifted by the lifter, so that the air suspension system continuously exhausts to restore the air suspension system to the target height, and further the problem of air bag damage existing after the automobile falls to the ground from the lifter is caused.
Based on the above, the embodiment of the invention provides a lifter mode identification method of a vehicle air suspension system, so as to avoid the problems.
Referring to fig. 1, fig. 1 is a flowchart illustrating a lifter pattern recognition method of a vehicle air suspension system according to an embodiment of the present invention.
Specifically, the lifter pattern recognition method of the vehicle air suspension system comprises S110-S130:
s110, detecting a lifter mode of the current round when the vehicle speed is 0;
s120, if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jump speed of the tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of the impact of the vehicle body corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jump speed and each current air suspension;
and S130, when the detection values of other vehicle body acceleration sensors are detected to be larger than a preset threshold value in the longest interval time, activating a lifter mode.
It should be noted that the vehicle air suspension system should include a suspension height sensor for detecting the height of the air suspension and a vehicle body acceleration sensor for detecting the acceleration of the vehicle body so that the controller can learn the vehicle body height change and the vehicle body acceleration change. For an air suspension system adopting a semi-active suspension sensor, a scheme of 4-height sensors and 3-acceleration sensors is generally adopted, and the scheme specifically comprises a left front suspension height sensor, a right front suspension height sensor, a left rear suspension height sensor, a right rear suspension height sensor, a left front vertical acceleration sensor, a right front vertical acceleration sensor and a right front vertical acceleration sensor. Each sensor is communicated with the controller, each sensor can acquire data at a preset interval period, and the controller can actively acquire the state data of the vehicle body from each detection sensor.
It will be appreciated that the vehicle body acceleration sensor may be used to detect the state of motion of the vehicle body and sometimes also the state of motion of the front wheels in the vertical direction. In consideration of the impact characteristics of the vehicle on the lifter, the embodiment of the invention selects the vehicle body acceleration sensor to detect the motion gesture of the vehicle body in the cycle time, so that whether the vehicle is on the lifter can be rapidly identified.
Specifically, in the embodiment of the present invention, the tire jump speed is understood to be the speed at which the distance between the vehicle body and the tire is pulled apart, and it is understood that when the vehicle is lifted by the lifter, the height of the vehicle body relative to the chassis is also raised, and at this time, the distance between the vehicle body and the tire is pulled up, so in the embodiment of the present invention, the tire jump speed of the tire corresponding to the vehicle body acceleration sensor is calculated and considered as the lifting speed of the lifter to lift the vehicle.
Further, as for the air suspension system of the semi-active suspension sensor, it has vehicle body acceleration sensors arranged at the left front side member, the right front side member, and the right rear side member. In the Y-side view of the vehicle, the vehicle body acceleration sensor is located close to the tire in the same direction. Therefore, each vehicle body acceleration sensor can find its corresponding tire.
Specifically, the height of the air suspension in the embodiment of the present invention refers to the distance from the wheel center to the wheel arch, which can be obtained by a height sensor, and since the height sensor is in the prior art, the detailed description thereof will not be repeated here.
Further, in the implementation of the maximum value of the height difference between the air suspensions, after the heights of the air suspensions are obtained through the height sensors, the height difference between the air suspensions is calculated, and the maximum value of the difference is selected as the maximum value of the height difference between the air suspensions.
Specifically, when the vehicle speed is detected to be 0, the controller starts to detect the lifter mode, and when the detection value of the first vehicle body acceleration sensor is detected to be larger than a preset threshold value during detection, the vehicle body is judged to be greatly rocked, and the current vehicle is initially considered to be on the lifter. Since the vehicle body is subject to the shake, which may be caused by the sudden removal of the vehicle or heavy goods from the trunk, etc., in order to prevent erroneous determination, it is necessary to further determine whether or not the detection value of the other vehicle body acceleration sensor is also greater than a preset threshold value in the time when the vehicle body is subjected to the impact.
Based on the technical scheme provided by the embodiment, the vehicle acceleration change is detected when the vehicle speed is 0 so as to detect whether the vehicle is on the lifter, so that when the vehicle acceleration change is judged to meet the requirement, the lifter mode is activated, and compared with the existing lifter mode identification method based on the height sensor, the lifter mode identification speed is faster, and the technical problem of air bag damage after the vehicle falls from the lifter due to slow lifter mode identification can be avoided.
Based on the solution provided by the foregoing embodiment, in an alternative implementation, after step S120, the method further includes S140:
and S140, restarting the detection of the lifting mode when detecting that the detection values of other vehicle body acceleration sensors are not all larger than a preset threshold value in the longest interval time.
It will be appreciated that when the detected value of the other vehicle body acceleration sensor is not greater than the preset threshold value within the longest interval time, it is indicated that the current vehicle may be or that heavy goods suddenly move out of the trunk or the like to cause vehicle body shake. At this point, the lifter mode need not be activated.
Based on the solution provided by the foregoing embodiment, in an optional implementation manner, the method further includes:
in the current round detection, acquiring the seat occupation information of the automobile at intervals of a preset period;
acquiring the current period seat occupying information when the current period is ended;
if the current period occupied seat information is different from the previous period occupied seat information, canceling the monitoring operation of the detection value of the vehicle body acceleration sensor in the next period;
and if the current period seat occupation information is the same as the previous period seat occupation information, monitoring the detection value of the vehicle body acceleration sensor in the next period to judge whether the detection value of the vehicle body acceleration sensor is larger than a preset threshold value.
In the embodiment of the invention, in order to prevent misjudgment, the occupation information of the vehicle should also be judged when the vehicle speed is 0. It will be appreciated that the scene where the vehicle body has a large shake at the vehicle speed of 0 is not only a scene where the vehicle is lifted by the lifter, but also a scene where the passenger gets off after the vehicle is stopped, for example, when the vehicle is stopped on the road and a heavy passenger gets off, the vehicle body also generates a large vehicle shake. If the vehicle is still detected to be on the lifting machine through the vehicle body acceleration change of the next period, the problem of false identification exists. Therefore, the recognition of the lifter mode is not performed by using the vehicle body acceleration of the next cycle.
Based on the technical solutions provided in the foregoing embodiments, in an alternative implementation manner, for the step "calculating the tire jump speed of the tire corresponding to the vehicle body acceleration sensor" in S120, the following manner is specifically calculated:
acquiring a first height value through a height sensor, and differentiating the first height value to obtain the tire jumping down speed; the first height value is a height value of an air suspension of a tire corresponding to a vehicle body acceleration sensor, wherein the first detection value of the first height value is larger than a preset threshold value in current round detection.
In the implementation, each height sensor can monitor the height of the corresponding air suspension in real time, and the controller detects the height of the air suspension in a time period by acquiring the height of the air suspension, so as to conduct differential processing, namely the speed corresponding to the pulled-out height of the tire and the wheel arch in the time period can be obtained, and the speed is used for estimating the lifting speed of the lifting machine.
Based on the technical solutions provided in the foregoing embodiments, in an optional implementation manner, for the step S120, the "the longest interval time of the impact on the vehicle body corresponding to the other vehicle body acceleration sensor" is calculated according to the tire down-jump speed and the maximum value of the height difference between the current air suspensions, which specifically is:
the maximum interval time is calculated by the following formula:
ΔT＝(ΔH _max +h 0 )/v
wherein DeltaT is the longest interval time, deltaH _max Is the maximum value of the height difference value between the current air suspensions, h 0 And v is the tire jumping-down speed, which is the preset relative height difference value of each supporting surface of the lifter.
Exemplary, h 0 The height difference of each supporting surface of the bracket type lifter required by JT/T155 automobile lifter product standard is less than or equal to 15mm, and the invention is not limited in this way, so long as the requirement of the relative height difference of each supporting surface of the lifter product is met.
Based on the technical solution provided in the foregoing embodiment, in an optional implementation manner, after detecting that the detection value of the vehicle body acceleration sensor is greater than the preset threshold value for the first time in the current round of detection, the method further includes:
setting the position of a lifter mode mark as 1;
then, after detecting that the detection values of the other vehicle body acceleration sensors are not all greater than the preset threshold value in the longest interval time, the method further includes:
and setting the position of the lifter mode flag to be 0.
That is, in the embodiment of the present invention, the controller records the lift mode when the detection value of the first vehicle body acceleration sensor is greater than the threshold value, so as to trigger the subsequent monitoring of other vehicle body acceleration sensors.
In yet another alternative embodiment, the lift mode flag is set to 1 after the lift mode is activated.
That is, in embodiments of the present invention, the controller will record and store the lift pattern to facilitate power down memory. For example, when the vehicle is on the lifter, the vehicle is powered down, and when the vehicle is powered up next time, the vehicle is still on the lifter by acquiring the lifter mode flag bit, and at the moment, the height compensation function is not allowed to be activated, so that the controller is required to memorize the last ignition cycle to activate the lifter mode.
Accordingly, embodiments of the present invention also provide a vehicle air suspension system comprising a controller configured to:
when the vehicle speed is 0, detecting a lifter mode of the current round;
if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension;
and when the detection values of other vehicle body acceleration sensors are detected to be larger than the preset threshold value in the longest interval time, activating a lifter mode.
Specifically, the vehicle air suspension system comprises a controller, a suspension height sensor and a vehicle body acceleration sensor. The suspension height sensor and the vehicle body acceleration sensor are connected with a vehicle body.
The suspension height sensor comprises a left front suspension height sensor, a right front suspension height sensor, a left rear suspension height sensor and a right rear suspension height sensor, and the vehicle body acceleration sensor comprises a left front vertical acceleration sensor, a right front vertical acceleration sensor and a right front vertical acceleration sensor.
The controller can acquire signals of each height sensor and each vehicle body acceleration sensor so as to monitor the motion state of the vehicle.
In an alternative embodiment, the controller is further configured to:
in the current round detection, acquiring the seat occupation information of the automobile at intervals of a preset period;
acquiring the current period seat occupying information when the current period is ended;
if the current period occupied seat information is different from the previous period occupied seat information, canceling the monitoring operation of the detection value of the vehicle body acceleration sensor in the next period;
and if the current period seat occupation information is the same as the previous period seat occupation information, monitoring the detection value of the vehicle body acceleration sensor in the next period to judge whether the detection value of the vehicle body acceleration sensor is larger than a preset threshold value.
In an alternative embodiment, the controller is further configured to:
and restarting the detection of the lifting mode when detecting that the detection values of other vehicle body acceleration sensors are not all larger than the preset threshold value in the longest interval time.
The step of calculating the tire jump-down speed of the tire corresponding to the vehicle body acceleration sensor specifically comprises the following steps:
acquiring a first height value through a height sensor, and differentiating the first height value to obtain the tire jumping down speed; the first height value is a height value of an air suspension of a tire corresponding to a vehicle body acceleration sensor, wherein the first detection value of the first height value is larger than a preset threshold value in current round detection.
In an optional implementation manner, the step of calculating the longest interval time of the impact on the vehicle body corresponding to the other vehicle body acceleration sensor according to the maximum value of the height difference between the tire jump speed and each current air suspension is specifically:
the maximum interval time is calculated according to the following formula:
ΔT＝(ΔH _max +h 0 )/v
wherein DeltaT is the longest interval time, deltaH _max Is the maximum value of the height difference value between the current air suspensions, h 0 And v is the tire jumping-down speed, which is the preset relative height difference value of each supporting surface of the lifter.
In an alternative embodiment, after detecting that the detection value of the vehicle body acceleration sensor is greater than the preset threshold value for the first time in the current round of detection, the method further includes:
setting the position of a lifter mode mark as 1;
then, after detecting that the detection values of the other vehicle body acceleration sensors are not all greater than the preset threshold value in the longest interval time, the method further includes:
and setting the position of the lifter mode flag to be 0.
In another alternative embodiment, after activating the lifting mode, further comprising:
and setting the position of the lifter mode mark to be 1.
It should be noted that, the functions and principles of the lifter mode of the vehicle air suspension system provided by the embodiment of the present invention and the vehicle air suspension system provided by the foregoing embodiment are in one-to-one correspondence, and are not repeated here.
The lifter mode identification method of the vehicle air suspension system and the vehicle air suspension system provided by the invention comprise the steps of detecting the lifter mode of the current round when the vehicle speed is 0; if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension; and when the detection values of other vehicle body acceleration sensors are detected to be larger than the preset threshold value in the longest interval time, activating a lifter mode. According to the invention, the vehicle acceleration change is detected when the vehicle speed is 0 so as to detect whether the vehicle is on the lifter, so that when the vehicle acceleration change is judged to meet the requirement, the lifter mode is activated, and compared with the existing lifter mode identification method based on the height sensor, the lifter mode identification speed is faster, and the technical problem of air bag damage after the vehicle falls from the lifter due to slow lifter mode identification can be avoided.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (9)
1. A method of identifying lift modes for a vehicle air suspension system, the method performed by a controller comprising:
when the vehicle speed is 0, detecting a lifter mode of the current round;
if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension;
when the detection values of other vehicle body acceleration sensors are detected to be larger than a preset threshold value in the longest interval time, activating a lifter mode;
the step of calculating the longest interval time of the impact on the vehicle body corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and the current air suspension, specifically:
the maximum interval time is calculated according to the following formula:
ΔT=（ΔH _max +h 0 ）/v
wherein delta isTFor the longest interval, deltaH _max At the maximum of the current height differences between the air suspensions,h 0 for the preset relative height difference of each supporting surface of the lifter,vis the tire down-slip speed.
2. A lifter pattern recognition method of a vehicle air suspension system as claimed in claim 1, wherein said method further comprises:
in the current round detection, acquiring the seat occupation information of the automobile at intervals of a preset period;
acquiring the current period seat occupying information when the current period is ended;
if the current period occupied seat information is different from the previous period occupied seat information, canceling the monitoring operation of the detection value of the vehicle body acceleration sensor in the next period;
and if the current period seat occupation information is the same as the previous period seat occupation information, monitoring the detection value of the vehicle body acceleration sensor in the next period to judge whether the detection value of the vehicle body acceleration sensor is larger than a preset threshold value.
3. The lift pattern recognition method of a vehicle air suspension system according to claim 1, wherein when the detected value of a vehicle body acceleration sensor is detected to be greater than a preset threshold value for the first time in the current round detection, calculating a tire jump speed of a tire corresponding to the vehicle body acceleration sensor, and calculating a longest interval time after which the vehicle body corresponding to other vehicle body acceleration sensors is impacted according to the maximum value of the height difference between the tire jump speed and each current air suspension;
and restarting the detection of the lifting mode when detecting that the detection values of other vehicle body acceleration sensors are not all larger than the preset threshold value in the longest interval time.
4. The method for identifying a lift mode of a vehicle air suspension system according to claim 1, wherein said step of calculating a tire jump down speed of a tire corresponding to said vehicle body acceleration sensor comprises:
acquiring a first height value through a height sensor, and differentiating the first height value to obtain the tire jumping down speed; the first height value is a height value of an air suspension of a tire corresponding to a vehicle body acceleration sensor, wherein the first detection value of the first height value is larger than a preset threshold value in current round detection.
5. A lifter pattern recognition method of a vehicle air suspension system as claimed in claim 3, wherein after detecting that the detection value of a vehicle body acceleration sensor is greater than a preset threshold value for the first time in the current round of detection, further comprising:
setting the position of a lifter mode mark as 1;
then, after detecting that the detection values of the other vehicle body acceleration sensors are not all greater than the preset threshold value in the longest interval time, the method further includes:
and setting the position of the lifter mode flag to be 0.
6. A lifter pattern recognition method of a vehicle air suspension system as claimed in claim 1, wherein
In that, after activating the lifting mode, it further comprises:
and setting the position of the lifter mode mark to be 1.
7. A vehicle air suspension system comprising a controller configured to:
when the vehicle speed is 0, detecting a lifter mode of the current round;
if the detection value of a vehicle body acceleration sensor is detected to be larger than a preset threshold value for the first time in the current round detection, calculating the tire jumping speed of a tire corresponding to the vehicle body acceleration sensor, and calculating the longest interval time of impact on vehicle bodies corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and each current air suspension;
when the detection values of other vehicle body acceleration sensors are detected to be larger than a preset threshold value in the longest interval time, activating a lifter mode;
the step of calculating the longest interval time of the impact on the vehicle body corresponding to other vehicle body acceleration sensors according to the maximum value of the height difference between the tire jumping speed and the current air suspension, specifically:
the maximum interval time is calculated according to the following formula:
ΔT=（ΔH _max +h 0 ）/v
wherein delta isTFor the longest interval, deltaH _max At the maximum of the current height differences between the air suspensions,h 0 for the preset relative height difference of each supporting surface of the lifter,vis the tire down-slip speed.
8. The vehicle air suspension system of claim 7 wherein said controller is further configured to:
in the current round detection, acquiring the seat occupation information of the automobile at intervals of a preset period;
acquiring the current period seat occupying information when the current period is ended;
if the current period occupied seat information is different from the previous period occupied seat information, canceling the monitoring operation of the detection value of the vehicle body acceleration sensor in the next period;
and if the current period seat occupation information is the same as the previous period seat occupation information, monitoring the detection value of the vehicle body acceleration sensor in the next period to judge whether the detection value of the vehicle body acceleration sensor is larger than a preset threshold value.
9. The vehicle air suspension system of claim 7 wherein said controller is further configured to:
and restarting the detection of the lifting mode when detecting that the detection values of other vehicle body acceleration sensors are not all larger than the preset threshold value in the longest interval time.
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| CN116619965A (en) * | 2023-05-05 | 2023-08-22 | 岚图汽车科技有限公司 | Air suspension control method, device, equipment and readable storage medium |
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