CN113815370B - Control method for lifting bridge of commercial vehicle air suspension system - Google Patents

Control method for lifting bridge of commercial vehicle air suspension system Download PDF

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Publication number
CN113815370B
CN113815370B CN202111129702.6A CN202111129702A CN113815370B CN 113815370 B CN113815370 B CN 113815370B CN 202111129702 A CN202111129702 A CN 202111129702A CN 113815370 B CN113815370 B CN 113815370B
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lifting
bridge
vehicle
lifting bridge
driving
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CN113815370A (en
Inventor
来玉新
邓莹
徐家明
孙建军
鲁欢
胡圣万
彭显威
郭祥靖
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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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
    • B60G17/018—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 use of a specific signal treatment or control method
    • 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
    • B60G17/018—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 use of a specific signal treatment or control method
    • B60G17/0185—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 use of a specific signal treatment or control method for failure detection
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention provides a control method of a lifting bridge of an air suspension system of a commercial vehicle, which comprises the following steps: acquiring the current running state of the vehicle, and judging whether the current state of the vehicle allows the hoisting bridge control function to be started or not; receiving an external instruction in real time; generating a lifting bridge control command according to the content of an external command on the premise that the current state of the vehicle allows the lifting bridge control function to be started; acquiring the current running state of the vehicle in real time; judging whether to enable a lifting bridge control function and the content of the lifting bridge control function to be executed according to the current running state of the vehicle, and generating a lifting bridge control command according to a judging result; and executing corresponding lifting bridge control operation according to the generated lifting bridge control command content. The control method of the lifting bridge provided by the invention has quicker response and more intelligent response.

Description

Control method for lifting bridge of commercial vehicle air suspension system
Technical Field
The invention belongs to the technical field of commercial vehicle suspension systems, and particularly relates to a control method for a lifting bridge of an air suspension system of a commercial vehicle.
Background
With the importance of commercial vehicle industry on vehicle bearing and fuel saving performance, the application of the lifting bridge function on trucks is more and more extensive, and the lifting bridge control method is also more important. The lifting bridge is an auxiliary axle which can be lifted and put down on the commercial vehicle, and can be lifted up when the vehicle is lightly loaded, so that the friction resistance between tires and the ground in the running process is reduced, and the oil consumption is reduced; when the load of the vehicle is too large, the lifting bridge is put down to bear the load, so that the bearing capacity of the vehicle is improved, the driving bridge is protected, and meanwhile, the stability of the vehicle is improved.
The existing lifting bridge function is mainly controlled based on manual commands, a driver is required to perform subjective judgment in advance, and then lifting bridge lifting and descending commands are input through a switch button, and the control method has long response time and low intellectualization
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a lifting bridge control method for an air suspension system of a commercial vehicle, which is added with an automatic lifting bridge control function on the basis of a manual lifting bridge control function.
The technical scheme adopted by the invention is as follows: a control method for a lifting bridge of an air suspension system of a commercial vehicle is characterized by comprising the following steps of: the method comprises the following steps:
step a, acquiring the current running state of the vehicle, and judging whether the current state of the vehicle allows the hoisting bridge control function to be started or not;
step b, receiving an external instruction in real time, wherein the external instruction is an input signal which is sent by an operator and is required to start a lifting bridge control function; generating a lifting bridge control command according to the content of an external command on the premise that the current state of the vehicle allows the lifting bridge control function to be started;
step c, acquiring the current running state of the vehicle in real time; on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, judging whether the lifting bridge control function is started and the lifting bridge control function content to be executed according to the current running state of the vehicle, and generating a lifting bridge control command according to a judging result;
and d, executing corresponding lifting bridge control operation according to the lifting bridge control command content generated in the step b or the step c.
In the above technical solution, in the step a, the judging conditions for allowing the boost bridge control function to be started are: the method comprises the steps that a vehicle does not receive a braking signal currently, the current speed of the vehicle is smaller than a set speed threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle is not failed currently; if either of the above-mentioned judgment conditions is not satisfied, the hoisting bridge control function is not allowed to be started.
In the above technical solution, in the step b, the external instruction refers to an input signal sent by an operator through a driving switch or a remote controller and requiring to start a lifting bridge control function, where the input signal includes a lifting bridge control lifting request signal and a lifting bridge control falling request signal.
In the above technical solution, in the step c, on the premise that the external command is not received and the current state of the vehicle allows the lifting bridge control function to be started, and the lifting bridge is determined to be in the falling state currently, if the slip rate of the current driving bridge of the vehicle is greater than the slip rate setting threshold, a lifting bridge control lifting request signal is generated.
In the above technical solution, in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is determined to be in the lifting state at present, and if the current driving axle load of the vehicle is determined to exceed the set full load threshold, a lifting bridge control drop request signal is generated; if the drive axle load of the vehicle is found to continuously rise after the lifting axle control falling request signal is generated, and the drive axle bearing air bag air pressure rises to the set drive axle bearing air bag air pressure threshold value and the duration exceeds the set first time threshold value, generating an alarm request signal; and if the drive axle load of the vehicle is judged to be reduced after the lifting axle control falling request signal is generated, and the air pressure of the drive axle bearing air bag is reduced to be below the critical air pressure of the drive axle bearing air bag, generating the lifting axle control lifting request signal.
In the above technical solution, in the step c, on the premise that the external command is not received and the current state of the vehicle allows the lifting bridge control function to be started, and the lifting bridge is determined to be in the lifting state currently, if the driving bridge height sensor fault, the air pressure sensor fault or the electromagnetic valve fault are determined, a lifting bridge control drop request signal is generated.
In the above technical solution, in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is determined to be in the lifting state at present, if it is determined that the height change curve of the driving bridge height sensor presents a vertical severe fluctuation state, and the duration time of the vertical severe fluctuation state exceeds a set second time threshold, the vehicle is considered to enter a bump road condition, and a lifting bridge control drop request signal is generated.
In the above technical solution, in the step d, after the lifting bridge driving system receives the lifting bridge control lifting request signal, lifting bridge control lifting operation is performed; when the lifting bridge driving system receives a lifting bridge control falling request signal, lifting bridge control falling operation is executed; and after the lifting bridge driving system receives the alarm request signal, executing alarm operation.
In the above technical solution, in the step d, the lifting bridge control lifting operation specifically includes the following steps: step 1.1, controlling the lifting air bag of the lifting bridge to be inflated to a set first lifting pressure target value, transferring the axle load of the lifting bridge to the driving bridge at the moment, and controlling the driving bridge to bear the air bag to supplement air so as to keep the height of the vehicle body at a normal target height in order to prevent the height of the vehicle body from being depressed; step 1.2, controlling the lifting bridge bearing air bag to deflate to a first bearing pressure target value so that the lifting bridge bearing air bag leaves the ground; step 1.3, circularly executing the step 1.1 and the step 1.2 until the lifting air bags of the lifting bridge and the bearing air bags of the driving bridge reach set pressure target values; and 1.4, controlling the bearing air bags of the drive axle to be inflated and deflated, so that the height of the vehicle body reaches the set height of the vehicle body to ensure the ground-leaving height of the lifting axle.
In the above technical solution, in the step d, the step d of controlling the falling operation of the lifting bridge specifically includes the following steps: step 2.1, controlling the lifting air bag of the lifting bridge to deflate to a set second lifting pressure target value, transferring the axle load of the driving bridge to the lifting bridge at the moment, and simultaneously controlling the bearing air bag of the driving bridge to deflate so as to ensure that the height of the vehicle body keeps a set height target in order to prevent the height of the vehicle body from rising due to load reduction; step 2.2, controlling the lifting bridge bearing air bag to be inflated to a second bearing pressure target value of the pressure target value, so that the lifting bridge bearing air bag contacts the ground; step 2.3, circularly executing the step 2.1 and the step 2.2 until the lifting air bags of the lifting bridge and the bearing air bags of the driving bridge reach set pressure target values; and 2.4, controlling the driving axle bearing air bags and the lifting axle bearing air bags to be inflated and deflated, so that the height of the vehicle body is restored to the normal target height, and simultaneously ensuring the axle load ratio of the driving axle and the lifting axle.
The beneficial effects of the invention are as follows: the invention provides a lifting bridge control method, which is characterized in that an automatic lifting bridge control function is added on the basis of a lifting bridge manual control function, and compared with the traditional lifting bridge control method, the lifting bridge control method provided by the invention is quicker and more intelligent in response. The invention provides two control modes, is more flexible in specific application, improves the intellectualization of the control system, and ensures the safety of an automatic control system during faults by setting a manual mode. The manual lifting bridge control is carried out subjective judgment by a driver according to actual conditions, and lifting or lowering of the lifting bridge is manually controlled through a cab rocker switch or a remote controller. And the ECU recognizes the current running state and working condition through signals fed back by the vehicle sensor, and automatically lifts or lowers the lifting bridge according to the set conditions. The invention judges that if the lifting bridge is in a lifting state, when the load of the driving shaft exceeds a set full load value, the lifting bridge is automatically put down for protecting the driving shaft and ensuring the driving safety. At this time, the lifting bridge is not allowed to lift again until the driving shaft load is lower than 50% of the set full load value, so that overload protection is effectively realized. The invention judges that the system has faults such as sensor faults, electromagnetic valve faults and the like, and the lifting bridge automatically descends to prevent unknown risks. At this time, the lifting bridge is not allowed to lift again until all faults are relieved, and fault protection is effectively achieved. When the invention detects that the vehicle is on a bumpy road, the lifting bridge is automatically lowered to ensure driving comfort and operation stability. At the moment, the lifting bridge is not allowed to lift again until the vehicle is detected to recover to the normal working condition, and bad road protection is effectively realized. Under normal working conditions, the axle loads of the bearing air bags of the drive axle and the lifting axle are distributed in a set proportion value. When the insufficient driving force of the vehicle is detected, the pressure of the bearing air bag is raised, the vehicle axle load is transferred to the driving axle until the driving force reaches the set range, and driving assistance is effectively realized.
Drawings
FIG. 1 is a schematic diagram of a system logic flow according to the present invention.
Fig. 2 is a schematic view of a partial device installation of the present invention.
Wherein, 1-pressure sensor, 2-transaxle bear the weight of the gasbag, 3-lift bridge lifts the gasbag, 4-lift bridge bears the weight of the gasbag.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1, the present invention provides a control method for a lift bridge of an air suspension system of a commercial vehicle, which is characterized in that: the method comprises the following steps:
and a, acquiring the current running state of the vehicle, and judging whether the current state of the vehicle allows the hoisting bridge control function to be started or not.
Specifically, in the step a, the judging condition that the lift bridge control function is allowed to be started is as follows: the method comprises the steps that a vehicle does not receive a braking signal currently, the current speed of the vehicle is smaller than a set speed threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle is not failed currently; if either of the above-mentioned judgment conditions is not satisfied, the hoisting bridge control function is not allowed to be started.
The invention is realized based on an air suspension system (ECAS system) electronically controlled by a passenger car/truck. The ECAS system consists of ECU, air spring, height sensor, pressure sensor, solenoid valve, remote controller and control switch. The ECU receives information such as an ignition lock ON gear signal, a vehicle speed signal, a brake signal, a control command signal, a sensor signal and the like, analyzes and processes the currently known information, identifies the vehicle state, further outputs a decision command, controls the electromagnetic valve to charge and discharge the air spring through the PWM signal, and finally realizes the vehicle body height control. The lift bridge control function is one of the basic control functions of the ECAS system. The lift bridge control function is enabled when the vehicle is stationary or traveling at low speed, and the function is disabled beyond a set speed threshold (20 km/s). The lifting bridge control function comprises a lifting bridge manual control mode and a lifting bridge automatic control mode.
And b, judging whether to enter a manual control mode of the lifting bridge. Receiving an external instruction in real time, wherein the external instruction is an input signal which is sent by an operator and is required to start a control function of a lifting bridge; and generating a lifting bridge control command according to the content of the external command on the premise that the current state of the vehicle allows the lifting bridge control function to be started.
Specifically, in the step b, the external instruction refers to an input signal sent by an operator through a driving switch or a remote controller and requiring to start a lifting bridge control function, where the input signal includes a lifting bridge control lifting request signal and a lifting bridge control falling request signal. The driver carries out subjective judgment whether to need the lifting bridge state according to actual conditions, and the lifting bridge is manually controlled to lift or descend through a cab rocker switch or a remote controller. And after receiving a lifting bridge driving switch signal or a remote controller control request signal, the system enters a manual lifting bridge control mode.
And c, judging whether to enter a lifting bridge automatic control mode. Acquiring the current running state of the vehicle in real time; on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, judging whether the lifting bridge control function is started and the lifting bridge control function content to be executed according to the current running state of the vehicle, and generating a lifting bridge control command according to a judging result. On the premise that no manual control request of the lifting bridge is input, the lifting bridge is allowed to automatically control, and the condition of meeting the triggering condition of the automatic control mode of the lifting bridge is judged.
Specifically, in the step c, the triggering conditions of the automatic lifting of the lifting bridge are as follows: on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a falling state at present, and if the slip rate of the current driving bridge of the vehicle is larger than a slip rate setting threshold value, a lifting bridge control lifting request signal is generated. The purpose is to adjust the lifting bridge to a lifted state to increase the driving force of the vehicle.
The slip rate is a standard for measuring whether the vehicle needs traction assistance or not, and the slip rate is calculated according to the formula:
specifically, in the step c, when the lifting bridge is in the lifting state, any one of the following conditions is satisfied, a lifting bridge control falling request signal is automatically sent, and the lifting bridge is adjusted to the falling state.
Triggering condition one of automatic falling of lifting bridge: on the premise that no external instruction is received and the current state of the vehicle allows the control function of the lifting bridge to be started, the lifting bridge is judged to be in the lifting state at present, and if the current driving shaft load of the vehicle is judged to exceed the set full load threshold value P n When the drive axle is in a driving state, a lifting axle control falling request signal is generated, and the purpose of the drive axle control falling request signal is to automatically put down the lifting axle to share the load of the drive axle; the aim of the above-mentioned process is to automatically lower the lifting bridge if it is in the lifted state, when the drive axle load exceeds the set full load threshold, in order to protect the drive axle and to ensure the driving safety. At this time, the lifting bridge is not allowed to lift again until the driving shaft load is lower than 50% of the set full load value, and the lifting bridge driving system does not perform the lifting operation of the lifting bridge even if an external command for lifting the lifting bridge is received in the above process.
And if the drive axle load of the vehicle is found to continuously rise after the lifting axle control falling request signal is generated, and the drive axle bearing air bag air pressure rises to the set drive axle bearing air bag air pressure threshold value and the duration exceeds the set first time threshold value T0, generating an alarm request signal. The air pressure threshold of the driving axle bearing air bag is 130% of the air pressure full load value of the driving axle bearing air bag. The aim of the process is to remind the driver that the air pressure threshold of the bearing air bag of the driving axle reaches the working limit, and the load condition of the driving axle cannot be improved continuously.
And if the drive axle load of the vehicle is judged to be reduced after the lifting axle control falling request signal is generated, and the air pressure of the drive axle bearing air bag is reduced to be below the critical air pressure of the drive axle bearing air bag, generating the lifting axle control lifting request signal. The aim of the above procedure is to ensure that after the vehicle form is safe, the lifting bridge is retracted again and the load is borne by the drive axle alone again. Under normal working conditions, the axle loads of the bearing air bags of the drive axle and the lifting axle are distributed in a set proportion value. When the shortage of the driving force of the vehicle is detected, the pressure of the lifting bridge bearing air bag is reduced, and the axle load of the vehicle is transferred to the driving axle until the driving force reaches a set range.
Triggering condition II of automatic falling of the lifting bridge: on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a lifting state at present, and if the driving bridge height sensor fault, the air pressure sensor fault or the electromagnetic valve fault are judged, a lifting bridge control falling request signal is generated. The purpose of the passing process is that if the system fails, such as a sensor failure, a solenoid valve failure, etc., the lifting bridge will automatically drop to prevent unknown risks. At this time, the lifting bridge is not allowed to lift again until all faults are relieved, and even if an external instruction for lifting the lifting bridge is received in the process, the lifting bridge driving system does not execute lifting operation of the lifting bridge.
Triggering condition III of automatic falling of the lifting bridge: on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a lifting state at present, and if the fact that the height change curve of the driving bridge height sensor presents a vertical violent fluctuation state and the duration time of the vertical violent fluctuation state exceeds a set second time threshold T1 is judged, the vehicle is considered to enter a bumpy road condition, and a lifting bridge control falling request signal is generated. The purpose of the upward process is to automatically lower the lift bridge when it is detected that the vehicle is on a bumpy road, in order to ensure driving comfort and operational stability. At this time, the lifting bridge is not allowed to lift again until the vehicle is detected to return to the normal working condition, and even if an external instruction for lifting the lifting bridge is received in the process, the lifting bridge driving system does not execute the lifting operation of the lifting bridge.
And d, executing corresponding lifting bridge control operation according to the lifting bridge control command content generated in the step b or the step c.
In the above technical solution, in the step d, after the lifting bridge driving system receives the lifting bridge control lifting request signal, lifting bridge control lifting operation is performed; when the lifting bridge driving system receives a lifting bridge control falling request signal, lifting bridge control falling operation is executed; and after the lifting bridge driving system receives the alarm request signal, executing alarm operation.
When the load of the driving shaft is lower than 50% of the set full load value, or a system is in fault such as sensor fault, electromagnetic valve fault and the like, or the vehicle is in abnormal working conditions such as bumpy road and the like, the lifting operation of the lifting bridge is not executed even if the lifting bridge driving system receives the lifting bridge control lifting request signal.
In the above technical solution, in the step d, the lifting bridge control lifting operation specifically includes the following steps:
step 1.1, controlling the lifting air bag of the lifting bridge to be inflated to set a first lifting pressure target value P 1 lifting up At the moment, the axle load of the lifting axle is transferred to the driving axle, so that the height of the vehicle body is prevented from being depressed, and the air supplement of the bearing air bag of the driving axle is controlled, so that the height of the vehicle body is kept at the normal target height H0, and the current vehicle body target height H0 and driving comfort are kept;
step 1.2, controlling the lift bridge load bearing air bag to deflate to the first load bearing pressure target value P 1 bearer The lifting bridge bearing air bags leave the ground to achieve the lifting aim of the lifting bridge;
step 1.3, circularly executing the step 1.1 and the step 1.2 until the lifting air bags of the lifting bridge and the bearing air bags of the driving bridge reach set pressure target values;
and 1.4, controlling the driving axle bearing air bag to be inflated and deflated, so that the height of the vehicle body reaches the set height H1 of the vehicle body, and ensuring the ground-leaving height of the lifting axle. The set height H1 of the vehicle body is larger than or equal to the normal target height H0.
In the above technical solution, in the step d, the step d of controlling the falling operation of the lifting bridge specifically includes the following steps:step 2.1, controlling the lifting bridge lifting air bag to be deflated to a set second lifting pressure target value P 2 lifting up At this time, the axle load of the drive axle is transferred to the lifting axle, so as to prevent the height of the vehicle body from rising due to load reduction, and simultaneously, the air bag carried by the drive axle is controlled to be deflated, so that the height of the vehicle body is kept at a set height H1, and the current height target of the vehicle body and the driving comfort are kept.
Step 2.2, controlling the lift bridge load bearing air bag to be inflated to a second load bearing pressure target value P 2 bear the weight of The lifting bridge bearing air bags are contacted with the ground so as to achieve the goal of falling of the lifting bridge;
step 2.3, circularly executing the step 2.1 and the step 2.2 until the lifting air bags of the lifting bridge and the bearing air bags of the driving bridge reach set pressure target values;
and 2.4, controlling the driving axle bearing air bags and the lifting axle bearing air bags to be inflated and deflated, so that the height of the vehicle body is restored to the normal target height, and simultaneously ensuring the axle load ratio of the driving axle and the lifting axle.
The invention provides a lifting bridge control system of an air suspension system of a commercial vehicle, which comprises a vehicle running state identification module, a vehicle state signal processing module, a lifting bridge decision control module and a lifting bridge driving system; the output end of the vehicle running state identification module is electrically connected with the input end of the lifting bridge decision control module. The output end of the vehicle state signal processing module is electrically connected with the input end of the lifting bridge decision control module. The output end of the lifting bridge decision control module is electrically connected with the signal input end of the lifting bridge driving system.
The input signal of the vehicle running state identification module includes: ignition ON signal, vehicle speed signal, brake pedal signal, parking hand brake signal and axle difference wheel difference signal. The vehicle running state identification module makes a judgment on the running state of the vehicle based on the input signal: the vehicle is stationary, the vehicle is started, or the vehicle is traveling. The vehicle running state identification module sends the judgment result of the vehicle running state to the lifting bridge decision control module.
The input signals of the vehicle state signal processing module include: the left height signal of the driving axle, the left air bag pressure signal of the driving axle, the right air bag pressure signal of the driving axle, the lifting air bag pressure signal of the lifting axle and the bearing air bag pressure signal of the lifting axle. The vehicle state signal processing module is used for carrying out data processing on the input signals, judging the current road condition of the vehicle through calculation, calculating the current axle load and driving force of a driving axle of the vehicle, and sending the judging result of the road condition, the current axle load and driving force calculation result of the driving axle to the lifting bridge decision control module.
The input end of the lifting bridge decision control module is also electrically connected with the signal output end of the cab control switch and the signal output end of the remote controller control button. The input signals of the lifting bridge decision control module comprise output signals of a cab control switch, output signals of a remote controller control button, vehicle running state signals, road condition signals of the current position of the vehicle, current axle load of a driving axle of the vehicle and driving force data. The lifting bridge decision control module judges whether to start a lifting bridge control function or not based on the input signals, adopts a lifting bridge manual control mode or a lifting bridge automatic control mode, adopts lifting bridge control lifting operation or lifting bridge control falling operation or forbids relevant operation.
Specifically, the lift bridge decision control module first determines whether the vehicle state allows the enable of the allow lift bridge control function based on the input signal. The judging conditions for starting the lifting bridge control function set by the lifting bridge decision control module are as follows: the method comprises the steps that a vehicle does not receive a braking signal currently, the current speed of the vehicle is smaller than a set speed threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle is not failed currently; if either of the above-mentioned judgment conditions is not satisfied, the hoisting bridge control function is not allowed to be started.
When the lifting bridge decision control module judges that the vehicle state allows the lifting bridge control function to be started, whether an output signal of a cab control switch or an output signal of a remote controller control button is received is judged. If yes, the lifting bridge decision control module enters a lifting bridge manual control mode, if no, the meeting condition of the triggering condition of the lifting bridge automatic control mode is judged according to the vehicle state information, and if the meeting condition is met, the lifting bridge decision control module enters the lifting bridge automatic control mode.
When the lifting bridge decision control module executes a lifting bridge manual control mode, the lifting bridge decision control module executes lifting bridge control lifting operation or lifting bridge control falling operation or prohibition operation according to the content of a lifting bridge driving switch signal or a remote controller control request signal, a road condition signal of the current position of the vehicle, the current axle load of a driving axle of the vehicle and driving force data.
When the lifting bridge decision control module executes the lifting bridge automatic control mode, the lifting bridge decision control module generates lifting bridge control function content to be executed according to the current state information of the vehicle, and generates a lifting bridge control command according to the lifting bridge control function content.
Specifically, when the lifting bridge decision control module determines that the lifting bridge is currently in a falling state and the slip rate of the current driving bridge of the vehicle is greater than a slip rate set threshold, a lifting bridge control lifting request signal is generated.
Specifically, the lift axle decision control module determines that the lift axle is currently in a lifted state and that the current drive axle load of the vehicle exceeds a set full load threshold P n When the drive axle is in a driving state, a lifting axle control falling request signal is generated, and the purpose of the drive axle control falling request signal is to automatically put down the lifting axle to share the load of the drive axle; when the lifting bridge decision control module judges that the driving shaft load is not lower than 50% of the set full load value, even if an external command for lifting the lifting bridge is received, a control command for prohibiting the lifting bridge control operation from being executed is still generated and sent to the lifting bridge driving system.
If the lifting bridge decision control module generates a lifting bridge control falling request signal and the lifting bridge driving system completes executing corresponding lifting bridge falling operation, the lifting bridge decision control module judges that the driving shaft load of the vehicle continues to rise, and when the driving bridge bearing air bag air pressure rises to a set driving bridge bearing air bag air pressure threshold value and the duration exceeds a set first time threshold value T0, an alarm request signal is generated and sent to a vehicle alarm device.
And if the lifting bridge decision control module generates a lifting bridge control falling request signal and the lifting bridge driving system finishes executing the corresponding lifting bridge falling operation, the lifting bridge decision control module judges that the driving shaft load of the vehicle is found to be reduced, and the air pressure of the driving bridge bearing air bag is reduced below the critical air pressure of the driving bridge bearing air bag, then the lifting bridge control lifting request signal is generated.
Specifically, the lifting bridge decision control module determines that the lifting bridge is currently in a lifting state, and generates a lifting bridge control falling request signal when a driving bridge height sensor fails, an air pressure sensor fails or an electromagnetic valve fails. When the lifting bridge decision control module judges that the vehicle sensor has faults, even if an external instruction for lifting the lifting bridge is received, a control command for prohibiting the lifting bridge control operation is generated and sent to the lifting bridge driving system.
Specifically, the lifting bridge decision control module judges that the lifting bridge is in a lifting state currently, and judges that a height change curve of a driving bridge height sensor presents a vertical violent fluctuation state, and if the duration of the vertical violent fluctuation state exceeds a set second time threshold T1, the vehicle is considered to enter a bumpy road condition, and a lifting bridge control falling request signal is generated. When the lifting bridge decision control module judges that the vehicle is in an abnormal road condition, even if an external instruction for lifting the lifting bridge is received, a control command for prohibiting the lifting bridge control operation from being executed is still generated and sent to the lifting bridge driving system.
And the signal input end of the lifting bridge driving system receives a control signal sent by the lifting bridge decision control module, and executes corresponding lifting bridge control operation according to the content of the control signal.
The lifting bridge driving system mainly controls inflation and deflation of a driving bridge air bag serving as an air spring, a lifting bridge lifting air bag and a lifting bridge bearing air bag through driving electromagnetic valves, so that lifting and falling of the lifting bridge are realized. The lifting bridge driving system is provided with a height sensor for detecting the speed of the vehicle and an air sensor for detecting the air pressure of the air bag, so that lifting or falling operation of the lifting bridge is guaranteed to meet the vehicle body height requirement and the axle load proportion requirement of the driving axle and the lifting axle.
The invention also provides a computer readable storage medium, wherein the computer readable storage medium is stored with a commercial vehicle air suspension system lifting bridge control method program, and the commercial vehicle air suspension system lifting bridge control method program realizes the steps of the commercial vehicle air suspension system lifting bridge control method in the technical scheme when being executed by a vehicle controller.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the invention is not limited to the above-described embodiments, but many variations are possible. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention should be considered to be within the scope of the present invention.
Here, it should be noted that the description of the above technical solution is exemplary, and the present specification may be embodied in different forms and should not be construed as being limited to the technical solution set forth herein. Rather, these descriptions will be provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the invention is limited only by the scope of the claims.
The shapes, dimensions, ratios, angles, and numbers disclosed for describing aspects of the present specification and claims are merely examples, and thus, the present specification and claims are not limited to the details shown. In the following description, a detailed description of related known functions or configurations will be omitted when it may be determined that the emphasis of the present specification and claims is unnecessarily obscured.
Where the terms "comprising," "having," and "including" are used in this specification, there may be additional or alternative parts unless the use is made, the terms used may generally be in the singular but may also mean the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "one side," "another side," "one end," "the other end," etc. may be used and used in this specification to describe various components, these components and portions should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with top and bottom elements, under certain circumstances, also being interchangeable or convertible with one another; the components at one end and the other end may be the same or different in performance from each other.
In addition, when constituting the components, although not explicitly described, it is understood that a certain error region is necessarily included.
In describing positional relationships, for example, when positional sequences are described as "on," "above," "below," and "next," unless words or terms such as "just" or "directly" are used, it is also possible to include cases where there is no contact or contact between them. If a first element is referred to as being "on" a second element, it does not mean that the first element must be located above the second element in the figures. The upper and lower portions of the component will change in response to changes in the angle and orientation of the view. Thus, in the drawings or in actual construction, if it is referred to that a first element is "on" a second element, it can comprise the case that the first element is "under" the second element and the case that the first element is "over" the second element. In describing the time relationship, unless "just" or "direct" is used, a case where there is no discontinuity between steps may be included in describing "after", "subsequent" and "preceding". The features of the various embodiments of the invention may be combined or spliced with one another, either in part or in whole, and may be implemented in a variety of different configurations as will be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be finally understood that the foregoing embodiments are merely illustrative of the technical solutions of the present invention and not limiting the scope of protection thereof, and although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents may be made to the specific embodiments of the invention, and these changes, modifications or equivalents are within the scope of protection of the claims appended hereto.
What is not described in detail in this specification is prior art known to those skilled in the art.

Claims (6)

1. A control method for a lifting bridge of an air suspension system of a commercial vehicle is characterized by comprising the following steps of: the method comprises the following steps:
step a, acquiring the current running state of the vehicle, and judging whether the current state of the vehicle allows the hoisting bridge control function to be started or not;
step b, receiving an external instruction in real time, wherein the external instruction is an input signal which is sent by an operator and is required to start a lifting bridge control function; generating a lifting bridge control command according to the content of an external command on the premise that the current state of the vehicle allows the lifting bridge control function to be started;
step c, acquiring the current running state of the vehicle in real time; on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, judging whether the lifting bridge control function is started and the lifting bridge control function content to be executed according to the current running state of the vehicle, and generating a lifting bridge control command according to a judging result;
step d, executing corresponding lifting bridge control operation according to the lifting bridge control command content generated in the step b or the step c;
in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a falling state at present, and if the slip rate of the current driving bridge of the vehicle is greater than a slip rate setting threshold value, a lifting bridge control lifting request signal is generated;
in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a lifting state at present, and if the current driving shaft load of the vehicle is judged to exceed a set full load threshold value, a lifting bridge control falling request signal is generated; if the drive axle load of the vehicle is found to continuously rise after the lifting axle control falling request signal is generated, and the drive axle bearing air bag air pressure rises to the set drive axle bearing air bag air pressure threshold value and the duration exceeds the set first time threshold value, generating an alarm request signal; if the drive axle load of the vehicle is judged to be reduced after the lifting axle control falling request signal is generated, and the air pressure of the drive axle bearing air bag is reduced to be below the critical air pressure of the drive axle bearing air bag, the lifting axle control lifting request signal is generated;
in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a lifting state at present, and if the driving bridge height sensor fault, the air pressure sensor fault or the electromagnetic valve fault are judged, a lifting bridge control falling request signal is generated;
in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting bridge control function to be started, the lifting bridge is judged to be in a lifting state at present, and if the height change curve of the driving bridge height sensor is judged to be in a vertical violent fluctuation state and the duration time of the vertical violent fluctuation state exceeds a set second time threshold value, the vehicle is considered to enter a bumpy road condition, and a lifting bridge control falling request signal is generated.
2. A method of controlling a lift bridge of an air suspension system for a commercial vehicle as claimed in claim 1, wherein: in the step a, the judging conditions for enabling the lifting bridge control function are as follows: the method comprises the steps that a vehicle does not receive a braking signal currently, the current speed of the vehicle is smaller than a set speed threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle is not failed currently; if either of the above-mentioned judgment conditions is not satisfied, the hoisting bridge control function is not allowed to be started.
3. A method of controlling a lift bridge of an air suspension system for a commercial vehicle as claimed in claim 1, wherein: in the step b, the external instruction refers to an input signal sent by an operator through a driving switch or a remote controller and requiring to start a lifting bridge control function, and the input signal includes a lifting bridge control lifting request signal and a lifting bridge control falling request signal.
4. A method of controlling a lift bridge of an air suspension system for a commercial vehicle as claimed in claim 1, wherein: in the step d, after the lifting bridge driving system receives the lifting bridge control lifting request signal, lifting bridge control lifting operation is executed; when the lifting bridge driving system receives a lifting bridge control falling request signal, lifting bridge control falling operation is executed; and after the lifting bridge driving system receives the alarm request signal, executing alarm operation.
5. A method of controlling a lift bridge of an air suspension system for a commercial vehicle as claimed in claim 1, wherein: the lifting bridge control lifting operation specifically comprises the following steps: step 1.1, controlling the lifting air bag of the lifting bridge to be inflated to a set first lifting pressure target value, transferring the axle load of the lifting bridge to the driving bridge at the moment, and controlling the driving bridge to bear the air bag to supplement air so as to keep the height of the vehicle body at a normal target height in order to prevent the height of the vehicle body from being depressed; step 1.2, controlling the lifting bridge bearing air bag to deflate to a first bearing pressure target value so that the lifting bridge bearing air bag leaves the ground; step 1.3, circularly executing the step 1.1 and the step 1.2 until the lifting air bags of the lifting bridge and the bearing air bags of the driving bridge reach set pressure target values; and 1.4, controlling the bearing air bags of the drive axle to be inflated and deflated, so that the height of the vehicle body reaches the set height of the vehicle body to ensure the ground-leaving height of the lifting axle.
6. A method of controlling a lift bridge of an air suspension system for a commercial vehicle as claimed in claim 1, wherein: the lifting bridge control falling operation specifically comprises the following steps: step 2.1, controlling the lifting air bag of the lifting bridge to deflate to a second lifting pressure target value of the set pressure target value, transferring the axle load of the driving bridge to the lifting bridge at the moment, and simultaneously controlling the driving bridge to carry the air bag to deflate so as to ensure that the height of the vehicle body keeps a set height target in order to prevent the height of the vehicle body from rising due to load reduction; step 2.2, controlling the lifting bridge bearing air bag to be inflated to a second bearing pressure target value, so that the lifting bridge bearing air bag contacts the ground; step 2.3, circularly executing the step 2.1 and the step 2.2 until the lifting air bags of the lifting bridge and the bearing air bags of the driving bridge reach set pressure target values; and 2.4, controlling the driving axle bearing air bags and the lifting axle bearing air bags to be inflated and deflated, so that the height of the vehicle body is restored to the normal target height, and simultaneously ensuring the axle load ratio of the driving axle and the lifting axle.
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CN111422018A (en) * 2020-04-17 2020-07-17 东风商用车有限公司 Self-adaptive air suspension system of commercial vehicle and control method
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