CN113815370A - 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 PDFInfo
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- CN113815370A CN113815370A CN202111129702.6A CN202111129702A CN113815370A CN 113815370 A CN113815370 A CN 113815370A CN 202111129702 A CN202111129702 A CN 202111129702A CN 113815370 A CN113815370 A CN 113815370A
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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
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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
- 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
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention provides a method for controlling a lifting axle 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 lifting axle control function to be started or not; receiving an external instruction in real time; generating a lifting bridge control command according to the external instruction content 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 a lifting axle control function and the content of the lifting axle control function to be executed are started or not according to the current running state of the vehicle, and generating a lifting axle control command according to a judgment 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 is quicker and more intelligent in response.
Description
Technical Field
The invention belongs to the technical field of commercial vehicle suspension systems, and particularly relates to a control method for a lifting axle of a commercial vehicle air suspension system.
Background
With the emphasis of the commercial vehicle industry on vehicle bearing and fuel saving performance, the application of the lifting axle function on the truck becomes more and more extensive, and the lifting axle control method becomes more important. The lifting axle is an auxiliary axle capable of being 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 driving process is reduced, and the oil consumption is reduced; when the vehicle load is too large, the lifting axle is put down to bear the load, the vehicle bearing capacity is improved, the drive axle is protected, and meanwhile the vehicle stability is improved.
The existing lifting bridge functions are mainly controlled based on manual commands, a driver needs to make subjective judgment in advance, and then lifting and descending commands of the lifting bridge are input through a switch button, and the control method is long in response time and insufficient in intellectualization
Disclosure of Invention
The invention aims to solve the defects of the background technology, and provides a control method of a lifting bridge of an air suspension system of a commercial vehicle.
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: the method comprises the following steps:
step a, acquiring the current running state of a vehicle, and judging whether the current state of the vehicle allows starting a control function of a lifting axle;
step b, receiving an external instruction in real time, wherein the external instruction is an input signal which is sent by an operator and requires starting a control function of the lifting bridge; generating a lifting bridge control command according to the external instruction content 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 axle control function to be started, judging whether the lifting axle control function and the content of the lifting axle control function to be executed are started or not according to the current running state of the vehicle, and generating a lifting axle control command according to a judgment 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 determination condition for allowing the hoisting bridge control function to be enabled is: the vehicle does not receive the brake signal currently, the current speed of the vehicle is smaller than a set speed set threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle does not break down currently; and if any one of the judgment conditions is not met, the control function of the lift bridge is not allowed to be started.
In the above technical solution, in the step b, the external instruction refers to an input signal which is sent by an operator through a driving switch or a remote controller and requires to start a control function of the hoist bridge, and the input signal includes a hoist bridge control lifting request signal and a hoist bridge control falling request signal.
In the above technical solution, in the step c, on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be enabled, it is determined that the lifting axle is currently in the falling state, and if the current drive axle slip ratio of the vehicle is greater than the slip ratio setting threshold, a lifting axle control lifting request signal is generated.
In the above technical solution, in the step c, on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be enabled, it is determined that the lifting axle is currently in the lifting state, and if it is determined that the current drive shaft load of the vehicle exceeds the set full load threshold, a lifting axle control falling request signal is generated; if after the lifting axle control falling request signal is generated, judging that the load of a driving shaft of the vehicle continues to rise, and when the air pressure of a driving axle bearing air bag rises to a set air pressure threshold value of the driving axle bearing air bag and the duration time exceeds a set first time threshold value, generating an alarm request signal; and if the load of the driving shaft of the vehicle is reduced and the air pressure of the driving axle bearing air bag is reduced to be lower than the critical air pressure of the driving axle bearing air bag after the lifting axle control falling request signal is generated, generating a lifting axle control lifting request signal.
In the above technical solution, in the step c, on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be enabled, it is determined that the lifting axle is currently in the lifting state, and if it is determined that the drive axle height sensor, the air pressure sensor or the electromagnetic valve is in failure, a lifting axle control falling request signal is generated.
In the above technical solution, in the step c, on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be enabled, it is determined that the lifting axle is currently in the lifting state, and if it is determined that the height variation curve of the drive axle height sensor shows the vertical severe fluctuation state, and the duration of the vertical severe fluctuation state exceeds a set second time threshold, it is determined that the vehicle enters the bumpy road condition, and a lifting axle control falling request signal is generated.
In the above technical solution, in the step d, after the hoist bridge driving system receives the hoist bridge control lifting request signal, the hoist bridge control lifting operation is executed; when the lifting bridge driving system receives a lifting bridge control falling request signal, the lifting bridge control falling operation is executed; and when the lifting bridge driving system receives the alarm request signal, executing alarm operation.
In the above technical solution, in the step d, the step of controlling the lifting operation by the lifting bridge specifically includes the following steps: step 1.1, controlling a lifting air bag of a lifting bridge to inflate to a set first lifting pressure target value, transferring the axle load of the lifting bridge to a driving axle at the moment, and controlling a bearing air bag of the driving axle to inflate to keep the height of the automobile body at a normal target height in order to prevent the height of the automobile body from being lowered; step 1.2, controlling the lifting bridge bearing air bag to deflate to a first bearing pressure target value, and enabling the lifting bridge bearing air bag to leave the ground; step 1.3, circularly executing the step 1.1 and the step 1.2 until the lifting air bag of the lifting bridge, the bearing air bag of the lifting bridge and the bearing air bag of the drive axle reach a set pressure target value; and step 1.4, controlling the drive axle bearing air bag to inflate and deflate so that the height of the vehicle body reaches the set height of the vehicle body to ensure the ground clearance of the lift axle.
In the above technical solution, in the step d, the operation of controlling the falling of the lifting bridge specifically includes the following steps: step 2.1, controlling the lifting bridge lifting air bag to deflate to a set second lifting pressure target value, transferring the axle load of the drive axle to the lifting bridge at the moment, and controlling the driving axle bearing air bag to deflate to enable the height of the vehicle body to be kept at the set height target in order to prevent the height of the vehicle body from rising caused by load reduction; step 2.2, controlling the lifting bridge bearing air bag to inflate to a second bearing pressure target value of the pressure target value, and enabling the lifting bridge bearing air bag to contact the ground; step 2.3, circularly executing the step 2.1 and the step 2.2 until the lifting air bag of the lifting bridge, the bearing air bag of the lifting bridge and the bearing air bag of the drive axle reach a set pressure target value; and 2.4, controlling the drive axle bearing air bag and the lifting axle bearing air bag to inflate and deflate, so that the height of the vehicle body is recovered to a normal target height, and simultaneously ensuring the axle load proportion of the drive shaft and the lifting shaft.
The invention has the beneficial effects that: the invention provides a control method of a lifting bridge, which is characterized in that an automatic lifting bridge control function is added on the basis of a manual lifting bridge control function. The invention provides two control modes, which are more flexible in specific application, improve the intelligence of the control system and ensure the safety of the automatic control system when the automatic control system fails by setting the manual mode. The manual lifting bridge is controlled by a driver to carry out subjective judgment according to actual conditions, and the lifting bridge is manually controlled to rise or fall through a cab rocker switch or a remote controller. The automatic lifting bridge is controlled, the ECU identifies the current running state and working condition through signals fed back by a vehicle sensor, and the lifting bridge is automatically lifted or lowered according to set conditions. According to the invention, if the lifting bridge is in the lifting state, when the load of the driving shaft exceeds the set full load value, the lifting bridge is automatically put down for protecting the driving shaft and ensuring the driving safety. At the moment, the lifting bridge is not allowed to be lifted again until the load of the driving shaft is lower than 50% of the set full-load value, and overload protection is effectively realized. According to the invention, the system is judged to have faults such as sensor faults, electromagnetic valve faults and the like, and the lifting bridge is automatically lowered so as to prevent unknown risks. At the moment, the lifting bridge is not allowed to be lifted again until all faults are relieved, and fault protection is effectively realized. When the invention detects that the vehicle is on a bumpy road surface, the lifting bridge is automatically lowered to ensure the driving comfort and the operation stability. At the moment, the lifting bridge is not allowed to be lifted again until the vehicle is detected to recover to a normal working condition, and the bad road protection is effectively realized. Under normal working conditions, the axle load of the drive axle and the load-bearing air bag of the lift axle are distributed in a set proportion value. When the driving force of the vehicle is detected to be insufficient, the pressure of the lifting bearing air bag is reduced, the axle load of the vehicle is transferred to the drive axle until the driving force reaches a set range, and driving assistance is effectively achieved.
Drawings
FIG. 1 is a logic flow diagram of the system of the present invention.
Fig. 2 is a schematic view of a partial device installation of the present invention.
The air bag lifting device comprises a pressure sensor 1, a drive axle bearing air bag 2, a lifting axle lifting air bag 3 and a lifting axle bearing air bag 4.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in FIG. 1, the invention provides a control method for a lift bridge of an air suspension system of a commercial vehicle, which is characterized by comprising the following steps: 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 control function of the lifting axle to be started.
Specifically, in the step a, the judgment condition for allowing the lift bridge control function to be enabled is: the vehicle does not receive the brake signal currently, the current speed of the vehicle is smaller than a set speed set threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle does not break down currently; and if any one of the judgment conditions is not met, the control function of the lift bridge is not allowed to be started.
The invention is realized based on an air suspension system (ECAS system) of electronic control of a passenger car/truck. The ECAS system consists of an ECU, an air spring, a height sensor, a pressure sensor, an electromagnetic valve, a remote controller and a 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 current 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 control of the height of the vehicle body. The hoist bridge control function is one of the basic control functions of the ECAS system. The lift bridge control function is allowed when the vehicle is stationary or running at low speed, and the function exceeding a set speed threshold value (20km/s) is prohibited. The lift bridge control function comprises a lift bridge manual control mode and a lift bridge automatic control mode.
And b, judging whether a manual control mode of the lifting bridge is entered. Receiving an external instruction in real time, wherein the external instruction is an input signal which is sent by an operator and requires starting a control function of a lifting bridge; and generating a lifting bridge control command according to the external instruction content 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 which is sent by an operator through a driving switch or a remote controller and requires to start a control function of the lift bridge, and the input signal includes a lift bridge control lifting request signal and a lift bridge control falling request signal. The driver subjectively judges whether the required state of the lifting bridge is needed according to the actual situation, and the lifting bridge is manually controlled to rise or fall through a rocker switch of a cab or a remote controller. And when the system receives a lifting bridge driving switch signal or a remote controller control request signal, entering a manual lifting bridge control mode.
And c, judging whether to enter an automatic control mode of the lifting bridge. Acquiring the current running state of the vehicle in real time; and on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, judging whether the lifting axle control function and the content of the lifting axle control function to be executed are started or not according to the current running state of the vehicle, and generating a lifting axle control command according to the judgment result. Namely, on the premise that no manual control request of the lifting bridge is input, the lifting bridge is allowed to carry out automatic control, and the condition that the triggering condition of the automatic control mode of the lifting bridge is met is judged.
Specifically, in the step c, the triggering conditions for automatic lifting of the lift bridge are as follows: and on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, judging that the lifting axle is currently in a falling state, and if the current drive axle slip rate of the vehicle is greater than a slip rate set threshold value, generating a lifting axle control lifting request signal. The aim is to adjust the lifting bridge to the lifting state so as to increase the driving force of the vehicle.
Wherein, whether the vehicle needs the supplementary standard of traction is measured in the slip ratio, slip ratio computational formula:
specifically, in the step c, when the lifting bridge is in the lifting state, any one of the following conditions is met, a lifting bridge falling control request signal is automatically sent out, and the lifting bridge is adjusted to the falling state.
The first triggering condition for automatic falling of the lifting bridge is as follows: on the premise that an external instruction is not received and the current state of the vehicle allows the control function of the lifting axle to be started, judging that the lifting axle is in the lifting state at present, and if the current load of the driving shaft of the vehicle exceeds the set full load threshold value PnGenerating a lifting bridge control falling request signal aiming at automatically putting down a lifting bridge to share the load of a drive axle; the purpose of the above procedure is that the lift bridge if in the lifted state,when the load of the driving shaft exceeds the set full-load threshold value, the lifting axle is automatically put down for protecting the driving shaft and ensuring the driving safety. At this time, the lift bridge is not allowed to be lifted again until the load of the drive shaft is lower than 50% of the set full load value, and even if an external command requesting to lift the lift bridge is received in the process, the lift bridge drive system does not perform the lift bridge lifting operation.
And if the driving shaft load of the vehicle is continuously increased after the lifting axle control falling request signal is generated, and the air pressure of the driving axle bearing air bag is increased to the set air pressure threshold value of the driving axle bearing air bag and the duration time exceeds the set first time threshold value T0, generating an alarm request signal. The air pressure threshold value of the drive axle bearing air bag is 130% of the air pressure full load value of the drive axle bearing air bag. The purpose of the above process is to remind the driver that the air pressure threshold of the drive axle bearing air bag reaches the working limit, and the load condition of the drive axle cannot be improved continuously.
And if the load of the driving shaft of the vehicle is reduced and the air pressure of the driving axle bearing air bag is reduced to be lower than the critical air pressure of the driving axle bearing air bag after the lifting axle control falling request signal is generated, generating a lifting axle control lifting request signal. The purpose of the above process is to retract the lift axle again after ensuring the vehicle form status to be safe, and then the drive axle alone bears the load again. Under normal working conditions, the axle load of the drive axle and the lift axle bearing air bags is distributed according to a set proportion value. When the driving force of the vehicle is detected to be insufficient, the pressure of the air bag carried by the lifting axle is reduced, and the axle load of the vehicle is transferred to the driving axle until the driving force reaches a set range.
Triggering conditions of automatic falling of the lifting bridge are as follows: and on the premise that an external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, judging that the lifting axle is currently in a lifting state, and if judging that the drive axle height sensor fails, the air pressure sensor fails or the electromagnetic valve fails, generating a lifting axle control falling request signal. The purpose of the process is that if the system fails, such as a sensor failure, an electromagnetic valve failure, etc., the lifting bridge will automatically descend to prevent unknown risks. At this time, the hoist bridge is not allowed to be hoisted again until all faults are relieved, and even if an external instruction requiring hoisting of the hoist bridge is received in the process, the hoist bridge driving system does not perform the hoist bridge hoisting operation.
Triggering conditions of automatic falling of the lifting bridge are as follows: and on the premise that an external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, judging that the lifting axle is currently in a lifting state, if the height change curve of the drive axle height sensor is judged to be in an up-down severe fluctuation state, and the duration of the up-down severe fluctuation state exceeds a set second time threshold T1, considering that the vehicle enters a bumpy road condition, and generating a lifting axle control falling request signal. The purpose of the process is to automatically lower the lifting axle when the vehicle is detected to be on a bumpy road surface in order to ensure driving comfort and operation stability. At the moment, the lifting bridge is not allowed to be lifted again until the vehicle is detected to recover to a normal working condition, and even if an external instruction requiring lifting of the lifting bridge is received in the process, the lifting bridge driving system does not execute 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 hoist bridge driving system receives the hoist bridge control lifting request signal, the hoist bridge control lifting operation is executed; when the lifting bridge driving system receives a lifting bridge control falling request signal, the lifting bridge control falling operation is executed; and when 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 has faults such as sensor faults and electromagnetic valve faults, or the vehicle is in abnormal working conditions such as a bumpy road surface, the lifting bridge driving system does not execute lifting operation of the lifting bridge after receiving a lifting bridge control lifting request signal.
In the above technical solution, in the step d, the step of controlling the lifting operation by the lifting bridge specifically includes the following steps:
step 1.1, controlling the lifting bridge to lift the air bag and inflate to the set secondPressure target value P rises at a stroke1 liftingAt the moment, the load of the lifting axle is transferred to the drive axle, and in order to prevent the height of the vehicle body from being reduced, the air supply of a drive axle bearing air bag is controlled at the same time, so that the height of the vehicle body is kept at the normal target height H0, and the current target height H0 of the vehicle body and the driving comfort are kept;
step 1.2, controlling the lift bridge bearing air bag to deflate to a first bearing pressure target value P1 carryingThe lifting bridge bearing air bag is separated from the ground so as to achieve the lifting target of the lifting bridge;
step 1.3, circularly executing the step 1.1 and the step 1.2 until the lifting air bag of the lifting bridge, the bearing air bag of the lifting bridge and the bearing air bag of the drive axle reach a set pressure target value;
and step 1.4, controlling the drive axle bearing air bag to inflate and deflate, and enabling the height of the vehicle body to reach the set height H1 of the vehicle body so as to ensure the ground clearance of the lift axle. The vehicle body set height H1 is greater than or equal to a normal target height H0.
In the above technical solution, in the step d, the operation of controlling the falling of the lifting bridge specifically includes the following steps: step 2.1, controlling the lifting air bag of the lifting bridge to deflate to set a second lifting pressure target value P2 liftingAnd at the moment, the axle load of the drive axle is transferred to the lifting axle, and in order to prevent the height of the vehicle body from rising due to the reduction of the load, the air of the load-bearing air bag of the drive axle is controlled to be deflated, so that the height of the vehicle body is kept at the set height H1, and the current vehicle body height target and the driving comfort are kept.
Step 2.2, controlling the lifting bridge bearing air bag to inflate to a second bearing pressure target value P2 carryingThe lifting bridge bearing air bag is made to contact the ground so as to achieve the aim of falling of the lifting bridge;
step 2.3, circularly executing the step 2.1 and the step 2.2 until the lifting air bag of the lifting bridge, the bearing air bag of the lifting bridge and the bearing air bag of the drive axle reach a set pressure target value;
and 2.4, controlling the drive axle bearing air bag and the lifting axle bearing air bag to inflate and deflate, so that the height of the vehicle body is recovered to a normal target height, and simultaneously ensuring the axle load proportion of the drive shaft and the lifting shaft.
The invention provides a lifting axle control system of a commercial vehicle air suspension system, which comprises a vehicle running state identification module, a vehicle state signal processing module, a lifting axle decision control module and a lifting axle driving system, wherein the vehicle running state identification module is used for identifying the vehicle running state of a vehicle; 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 hoisting bridge decision control module is electrically connected with the signal input end of the hoisting bridge driving system.
The input signal of the vehicle driving state recognition module comprises: ignition ON signal, vehicle speed signal, brake pedal signal, parking hand brake signal, axle difference wheel difference signal. The vehicle running state identification module judges the running state of the vehicle based on the input signal: vehicle stationary, vehicle start, or vehicle driving. And the vehicle running state identification module sends the judgment result of the vehicle running state to the lifting bridge decision control module.
The input signal of the vehicle state signal processing module comprises: a drive axle left height signal, a drive axle left air bag pressure signal, a drive axle right air bag pressure signal, a lifting axle lifting air bag pressure signal and a lifting axle bearing air bag pressure signal. 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, calculating the current axle load and driving force of a driving shaft of the vehicle and sending the judgment result of the road condition, the current axle load and the driving force calculation result of the driving shaft 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, current road condition signals of the vehicle, current axle load of a driving shaft 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 signal, adopts a lifting bridge manual control mode or a lifting bridge automatic control mode, and adopts a lifting bridge to control lifting operation or control falling operation or forbids execution of related operation.
Specifically, the lift axle decision control module first determines whether the vehicle state allows the lift axle enable control function to be enabled based on the input signal. The judgment condition for starting the control function of the hoisting bridge set by the decision control module of the hoisting bridge is as follows: the vehicle does not receive the brake signal currently, the current speed of the vehicle is smaller than a set speed set threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle does not break down currently; and if any one of the judgment conditions is not met, the control function of the lift bridge is not allowed to be started.
When the lifting bridge decision control module judges that the vehicle state allows starting the function of allowing the lifting bridge to be controlled, whether an output signal of a cab control switch or an output signal of a remote controller control button is received is judged. If the trigger 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 forbidding operation according to lifting bridge driving switch signal or remote controller control request signal content selection, current road condition signal of the vehicle, current axle load of a driving shaft of the vehicle and driving force data.
When the lifting bridge decision control module executes the automatic control mode of the lifting bridge, the lifting bridge decision control module generates the control function content of the lifting bridge to be executed according to the current state information of the vehicle, and generates a control command of the lifting bridge according to the control function content of the lifting bridge.
Specifically, the lift axle decision control module generates a lift axle control lifting request signal when judging that the lift axle is currently in a falling state and the current drive axle slip rate of the vehicle is greater than a slip rate set threshold.
Specifically, the decision control module of the lifting axle judges that the lifting axle is currently in a lifting state and the current load of a driving shaft of the vehicle exceeds a set full load threshold value PnGenerating a lifting bridge control falling request signal aiming at automatically putting down a lifting bridge to share the load of a drive axle; and when the decision control module of the hoisting bridge judges that the load of the driving shaft is not lower than 50% of the set full load value, even if an external instruction requiring hoisting of the hoisting bridge is received, a control command forbidding execution of control operation of the hoisting bridge is generated and sent to a driving system of the hoisting bridge.
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 continues to rise, the air pressure of the driving bridge bearing air bag rises to a set driving bridge bearing air bag air pressure threshold value, and the duration time 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 corresponding lifting bridge falling operation, the lifting bridge decision control module judges that the load of a driving shaft of the vehicle is reduced and the air pressure of the driving bridge bearing air bag is reduced to be lower than the critical air pressure of the driving bridge bearing air bag, and 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 if the drive axle height sensor fails, the air pressure sensor fails or the electromagnetic valve fails, a lifting bridge falling control request signal is generated. When the decision control module of the lifting bridge judges that the vehicle sensor has a fault, even if an external instruction requiring lifting of the lifting bridge is received, a control command forbidding execution of control operation of the lifting bridge is still generated and sent to a driving system of the lifting bridge.
Specifically, the lifting axle decision control module determines that the lifting axle is currently in a lifting state, determines that the height change curve of the drive axle height sensor is in an up-down severe fluctuation state, determines that the duration time of the up-down severe fluctuation state exceeds a set second time threshold T1, and determines that the vehicle enters a bumpy road condition to generate a lifting axle falling control request signal. When the decision control module of the lifting bridge judges that the vehicle is in abnormal road conditions, even if an external instruction requiring lifting of the lifting bridge is received, a control command forbidding execution of control operation of the lifting bridge is generated and sent to a driving system of the lifting bridge.
And the signal input end of the lifting bridge driving system receives the 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 is mainly used for controlling the driving bridge air bag, the lifting bridge lifting air bag and the lifting bridge bearing air bag of the air spring through a driving electromagnetic valve, so that the lifting and falling of the lifting bridge are realized. A height sensor for detecting the vehicle speed height and an air sensor for detecting the air pressure of an air bag are arranged in the lifting bridge driving system, so that the lifting or falling operation of the lifting bridge is ensured to meet the vehicle body height requirement and the axle load proportion requirement of the driving shaft and the lifting shaft.
The invention also provides a computer readable storage medium, wherein a commercial vehicle air suspension system lifting axle control method program is stored on the computer readable storage medium, and the steps of the commercial vehicle air suspension system lifting axle control method in the technical scheme are realized when the commercial vehicle air suspension system lifting axle control method program is executed by a vehicle controller.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit 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 solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are 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 present invention is limited only by the scope of the claims.
The shapes, sizes, ratios, angles, and numbers disclosed to describe aspects of the specification and claims are examples only, and thus, the specification and claims are not limited to the details shown. In the following description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present specification and claims, the detailed description will be omitted.
Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.
Further, in constituting the component, although it is 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 being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the member will change depending on the angle of view and the change in orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps. The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would 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
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the present invention, but these changes, modifications or equivalents are within the protection scope of the appended claims.
Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A control method for a lifting bridge of an air suspension system of a commercial vehicle is characterized by comprising the following steps: the method comprises the following steps:
step a, acquiring the current running state of a vehicle, and judging whether the current state of the vehicle allows starting a control function of a lifting axle;
step b, receiving an external instruction in real time, wherein the external instruction is an input signal which is sent by an operator and requires starting a control function of the lifting bridge; generating a lifting bridge control command according to the external instruction content 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 axle control function to be started, judging whether the lifting axle control function and the content of the lifting axle control function to be executed are started or not according to the current running state of the vehicle, and generating a lifting axle control command according to a judgment 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.
2. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 1, characterized in that: in the step a, the judgment condition for allowing the hoisting bridge control function to be started is as follows: the vehicle does not receive the brake signal currently, the current speed of the vehicle is smaller than a set speed set threshold, a driving shaft of the vehicle is not overloaded currently, and a sensor of the vehicle does not break down currently; and if any one of the judgment conditions is not met, the control function of the lift bridge is not allowed to be started.
3. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 1, characterized in that: in the step b, the external instruction refers to an input signal which is sent by an operator through a driving switch or a remote controller and requires starting a control function of the lifting bridge, and the input signal comprises a lifting bridge control lifting request signal and a lifting bridge control falling request signal.
4. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 1, characterized in that: in the step c, on the premise that the external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, the lifting axle is judged to be in the falling state at present, and if the current drive axle slip rate of the vehicle is greater than the slip rate set threshold, a lifting axle control lifting request signal is generated.
5. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 4, characterized in that: in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, the lifting axle is judged to be in the lifting state at present, and if the current load of the driving shaft of the vehicle is judged to exceed the set full load threshold, a lifting axle control falling request signal is generated; if after the lifting axle control falling request signal is generated, judging that the load of a driving shaft of the vehicle continues to rise, and when the air pressure of a driving axle bearing air bag rises to a set air pressure threshold value of the driving axle bearing air bag and the duration time exceeds a set first time threshold value, generating an alarm request signal; and if the load of the driving shaft of the vehicle is reduced and the air pressure of the driving axle bearing air bag is reduced to be lower than the critical air pressure of the driving axle bearing air bag after the lifting axle control falling request signal is generated, generating a lifting axle control lifting request signal.
6. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 5, characterized in that: in the step c, on the premise that an external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, the lifting axle is judged to be in the lifting state at present, and if the driving axle height sensor fault, the air pressure sensor fault or the electromagnetic valve fault is judged, a lifting axle control falling request signal is generated.
7. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 6, characterized in that: and c, judging that the lifting axle is in the lifting state at present on the premise that an external instruction is not received and the current state of the vehicle allows the lifting axle control function to be started, and if the height change curve of the drive axle height sensor is judged to be in the vertical severe fluctuation state and the duration of the vertical severe fluctuation state exceeds a set second time threshold, considering that the vehicle enters the working condition of a bumpy road surface, and generating a lifting axle control falling request signal.
8. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 7, characterized in that: in the step d, after the drive system of the lifting bridge receives the lifting bridge control lifting request signal, the lifting bridge control lifting operation is executed; when the lifting bridge driving system receives a lifting bridge control falling request signal, the lifting bridge control falling operation is executed; and when the lifting bridge driving system receives the alarm request signal, executing alarm operation.
9. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 7, characterized in that: the lifting operation controlled by the lifting bridge specifically comprises the following steps: step 1.1, controlling a lifting air bag of a lifting bridge to inflate to a set first lifting pressure target value, transferring the axle load of the lifting bridge to a driving axle at the moment, and controlling a bearing air bag of the driving axle to inflate to keep the height of the automobile body at a normal target height in order to prevent the height of the automobile body from being lowered; step 1.2, controlling the lifting bridge bearing air bag to deflate to a first bearing pressure target value, and enabling the lifting bridge bearing air bag to leave the ground; step 1.3, circularly executing the step 1.1 and the step 1.2 until the lifting air bag of the lifting bridge, the bearing air bag of the lifting bridge and the bearing air bag of the drive axle reach a set pressure target value; and step 1.4, controlling the drive axle bearing air bag to inflate and deflate so that the height of the vehicle body reaches the set height of the vehicle body to ensure the ground clearance of the lift axle.
10. The control method for the lifting bridge of the air suspension system of the commercial vehicle according to claim 7, characterized in that: the lifting bridge controlled 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, wherein the load of a drive axle shaft is transferred to the lifting bridge at the moment, and controlling the load-bearing air bag of the drive axle to deflate to keep the height of the vehicle body at the set height target in order to prevent the height of the vehicle body from rising caused by load reduction; step 2.2, controlling the lifting bridge bearing air bag to inflate to a second bearing pressure target value, and enabling the lifting bridge bearing air bag to contact the ground; step 2.3, circularly executing the step 2.1 and the step 2.2 until the lifting air bag of the lifting bridge, the bearing air bag of the lifting bridge and the bearing air bag of the drive axle reach a set pressure target value; and 2.4, controlling the drive axle bearing air bag and the lifting axle bearing air bag to inflate and deflate, so that the height of the vehicle body is recovered to a normal target height, and simultaneously ensuring the axle load proportion of the drive shaft and the lifting shaft.
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| CN202111129702.6A CN113815370B (en) | 2021-09-26 | 2021-09-26 | Control method for lifting bridge of commercial vehicle air suspension system |
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| CN202111129702.6A CN113815370B (en) | 2021-09-26 | 2021-09-26 | Control method for lifting bridge of commercial vehicle air suspension system |
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Cited By (1)
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| CN115257272A (en) * | 2022-08-09 | 2022-11-01 | 东风柳州汽车有限公司 | Control method and system for rear lifting axle of truck |
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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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Also Published As
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| CN113815370B (en) | 2023-07-25 |
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