CN115056623B - Mechanical control system and control method of rear movable lifting bridge - Google Patents
Mechanical control system and control method of rear movable lifting bridge Download PDFInfo
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- CN115056623B CN115056623B CN202210879319.0A CN202210879319A CN115056623B CN 115056623 B CN115056623 B CN 115056623B CN 202210879319 A CN202210879319 A CN 202210879319A CN 115056623 B CN115056623 B CN 115056623B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/052—Pneumatic spring characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/20—Spring action or springs
- B60G2500/202—Height or leveling valve for air-springs
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Abstract
本申请公开了一种后活动提升桥的机械控制系统及控制方法，涉及车辆控制技术领域，所述机械控制系统还包括第一溢流阀和第二溢流阀，所述空气悬架电磁阀的第一气口通过气管依次连接于第一溢流阀和承载气囊，所述静断机构的第一供气接口通过气管连接至第二气口，所述静断机构的第二供气接口通过气管连接至第一气口；所述承载气囊和举升气囊具有相同的最大工作压力值；所述空气悬架电磁阀出气的气压值大于溢流阈值，所述溢流阈值大于最大工作压力值；且空气悬架电磁阀工作时满足静断机构的两个供气接口的工作气压差。本申请的机械控制系统及控制方法，采用气路机械式静断机构控制方案，简化了控制程序，系统可靠性高。
The present application discloses a mechanical control system and control method for a rear movable lifting axle, which relates to the field of vehicle control technology. The mechanical control system also includes a first overflow valve and a second overflow valve. The first air port of the air suspension solenoid valve is connected to the first overflow valve and the load-bearing airbag in sequence through an air pipe. The first air supply interface of the static break mechanism is connected to the second air port through an air pipe, and the second air supply interface of the static break mechanism is connected to the first air port through an air pipe. The load-bearing airbag and the lifting airbag have the same maximum working pressure value. The air pressure value of the air suspension solenoid valve outlet is greater than the overflow threshold, and the overflow threshold is greater than the maximum working pressure value. When the air suspension solenoid valve is working, it satisfies the working air pressure difference of the two air supply interfaces of the static break mechanism. The mechanical control system and control method of the present application adopt an air circuit mechanical static break mechanism control scheme, which simplifies the control procedure and has high system reliability.
Description
Technical Field
The application relates to the technical field of vehicle control, in particular to a mechanical control system and a mechanical control method of a rear movable lifting bridge.
Background
At present, the medium-long distance transport vehicle pays great attention to two indexes of load and oil consumption, namely, the vehicle is heavy in load and the vehicle is required to save oil, so that a vehicle type capable of realizing switching between a double-rear axle driving mode and a single-rear axle driving mode is designed by related technicians to meet the market demand. When the vehicle is full-loaded, the double-rear axle drive is adopted to maximize the load of the vehicle, so that the economic benefit of the operation of the whole vehicle is improved, and when the vehicle pulls some cargoes with lighter weight or half-load, the vehicle is switched to single-rear axle drive, so that the optimal load of the current drive axle is realized, the optimal driving force is achieved, and the aim of saving fuel is fulfilled.
Specifically, the dual rear axle includes a rear fixed lift axle and a rear movable lift axle, the rear movable lift axle being located rearmost of the transport vehicle. Because of the safety of driving, before the double-rear axle driving and the single-rear axle driving are switched, the following condition must be met that the air suspension can only put down or lift the rear movable lifting axle after the rear movable lifting axle is combined or disconnected with the transmission mechanism. The vehicle is characterized in that ① when the whole vehicle is fully loaded, double-rear-axle driving is adopted, in this case, the combination of the rear movable lifting axle and the transmission mechanism is realized through the static breaking mechanism (in a vehicle static state), then the suspension bearing air bag is inflated, the lifting air bag is deflated, the rear movable lifting axle descends, wheels corresponding to the rear movable lifting axle are grounded, double-rear-axle driving is realized, ② is adopted under the condition that the half load or the load of the whole vehicle does not exceed the maximum load calibrated by single-axle driving, in this case, the rear movable lifting axle and the transmission mechanism are cut off through the static breaking mechanism, the suspension bearing air bag is deflated, the lifting air bag is inflated, the wheels corresponding to the rear movable lifting axle are lifted up and suspended from the ground, and the corresponding rear wheels are lifted up and lifted from the ground, so that the single-rear-axle driving is realized.
In the related art, as shown in fig. 1, the rear movable lifting bridge mainly adopts an electric control scheme, the air processing unit is connected to the duplex electromagnetic valve through air paths, the duplex electromagnetic valve is respectively connected with two air supply interfaces of the static breaking mechanism through two air paths, the electric control unit controls the duplex electromagnetic valve, and then controls air supply of the static breaking mechanism (the static breaking mechanism is arranged between the rear movable lifting bridge and the transmission mechanism) to control the combination and disconnection of the rear movable lifting bridge and the transmission mechanism, so that the switching of two driving modes of double-bridge driving and single-bridge driving is realized. The two air supply interfaces of the static breaking mechanism are respectively a first air supply interface and a second air supply interface, when the first air supply interface is inflated and the second air supply interface is deflated, the movable lifting bridge and the transmission mechanism are cut off, and when the first air supply interface is deflated and the second air supply interface is inflated, the movable lifting bridge and the transmission mechanism are communicated.
However, the conventional electronically controlled control scheme has the following problems:
The control method comprises the steps of a first control program and a second control program, wherein the first control program and the second control program are relatively complex, the traditional electric control scheme needs to ensure that the static breaking mechanism is disconnected or combined and then the lifting bridge is lifted and lowered, the sequence is obvious, the static breaking mechanism needs to be controlled through a duplex electromagnetic valve, two air bags are controlled through an air suspension electromagnetic valve, the electric control unit needs to send a command to the air suspension electromagnetic valve after the duplex electromagnetic valve is electrified to complete the action of the static breaking mechanism, and the two air bags are controlled to be inflated and deflated;
And if the second and the double electromagnetic valves and circuits between the double electromagnetic valves and the electric control unit fail, the system fails, and the system reliability is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a mechanical control system and a control method of a rear movable lifting bridge, and the control program is simplified by adopting a gas circuit mechanical static breaking mechanism control scheme, so that the system reliability is high.
In order to achieve the aim, the technical proposal is that a mechanical control system of a rear movable lifting bridge comprises an air suspension electromagnetic valve, a static breaking mechanism, a bearing air bag and a lifting air bag,
The mechanical control system further comprises a first overflow valve and a second overflow valve, and the air suspension electromagnetic valve comprises a first air port and a second air port for alternately discharging air and discharging air;
the first air port is sequentially connected with the first overflow valve and the bearing air bag through air pipes, and the second air port is sequentially connected with the second overflow valve and the lifting air bag through air pipes;
The first air supply interface of the static breaking mechanism is connected to the second air port through an air pipe, and the second air supply interface of the static breaking mechanism is connected to the first air port through an air pipe;
The first overflow valve and the second overflow valve have the same overflow threshold value, the backflow threshold value is zero, the bearing air bag and the lifting air bag have the same maximum working pressure value, the air pressure value of the air suspension electromagnetic valve is larger than the overflow threshold value, the overflow threshold value is larger than the maximum working pressure value, and the working air pressure difference of two air supply interfaces of the static breaking mechanism is met when the air suspension electromagnetic valve works.
On the basis of the technical scheme, the mechanical control system further comprises an air processing unit, the air processing unit is communicated to an air inlet of the air suspension electromagnetic valve through an air pipe, and the air suspension electromagnetic valve controls the airflow direction through a first air port and a second air port of the air suspension electromagnetic valve.
On the basis of the technical scheme, the mechanical control system further comprises a lifting switch and an electric control unit, wherein the lifting switch is sequentially connected with the electric control unit and the air suspension electromagnetic valve through a circuit, and sends switching instructions of a single rear axle and a double rear axle to the air suspension electromagnetic valve through the electric control unit;
When the double rear axles are switched to the single rear axle, the air suspension electromagnetic valve receives the switching instruction of the electric control unit, the first air port is used for inflating the first overflow valve, the second air port is used for deflating the outside, and when the double rear axles are switched to the double rear axles, the air suspension electromagnetic valve receives the switching instruction of the electric control unit, the first air port is used for deflating the outside, and the second air port is used for inflating the second overflow valve.
On the basis of the technical scheme, the overflow threshold is 7.3bar, the air pressure value of the air suspension electromagnetic valve is 12bar, the working air pressure difference threshold of two air supply interfaces of the static breaking mechanism is 6bar, and the maximum working pressure value inside the bearing air bag and the lifting air bag is 5.5bar;
When the air suspension electromagnetic valve works, one air port of the air suspension electromagnetic valve is deflated outwards, the other air port is inflated to one overflow valve, and the working air pressure difference of the two air supply interfaces of the static breaking mechanism is larger than 6bar.
On the basis of the technical scheme, the first overflow valve and the second overflow valve are both reflux overflow valves, when air flows from any air port of the air suspension electromagnetic valve to the overflow valve for inflating and flows to the bearing air bag or the lifting air bag, the air flow pressure is larger than an overflow threshold value, the overflow valve is conducted, when air flows from any air port of the air suspension electromagnetic valve to deflate, and when the air flows from the bearing air bag or the lifting air bag to the air suspension electromagnetic valve through the overflow valve, the air flow pressure is larger than zero, and the overflow valve is conducted.
The application also discloses a control method based on the mechanical control system, which comprises the following steps:
the single rear axle is switched to the double rear axles, or the double rear axles are switched to the single rear axle;
the single rear axle to dual rear axles switching comprises:
The first air port of the air suspension electromagnetic valve is used for inflating the static breaking mechanism through the second air supply port, the first air supply port of the static breaking mechanism is used for deflating the outside through the second air port, and the static breaking mechanism is communicated with the rear movable lifting bridge and the transmission mechanism;
The first air port of the air suspension electromagnetic valve is used for inflating the bearing air bag through the first overflow valve, the lifting air bag is used for deflating from the second air port through the second overflow valve, and the rear movable lifting bridge is placed down.
The switching from the dual rear axle to the single rear axle comprises:
The second air port of the air suspension electromagnetic valve inflates the static breaking mechanism through the first air supply port, the second air supply port of the static breaking mechanism deflates the outside through the second air port, and the static breaking mechanism is disconnected and then the movable lifting bridge and the transmission mechanism are moved;
The second air port of the air suspension electromagnetic valve is inflated to the lifting air bag through the second overflow valve, the bearing air bag is deflated from the first air port through the first overflow valve, and the rear movable lifting bridge is lifted.
On the basis of the technical scheme, the mechanical control system further comprises an air processing unit, the air processing unit is communicated to an air inlet of the air suspension electromagnetic valve through an air pipe, and the air suspension electromagnetic valve controls the airflow direction through a first air port and a second air port of the air suspension electromagnetic valve.
On the basis of the technical scheme, the mechanical control system further comprises a lifting switch and an electric control unit, wherein the lifting switch is sequentially connected with the electric control unit and the air suspension electromagnetic valve through a circuit, and sends switching instructions of a single rear axle and a double rear axle to the air suspension electromagnetic valve through the electric control unit;
when the single rear axle is switched to the double rear axles, the method comprises the following steps:
The lifting switch sends a switching instruction from a single rear axle to a double rear axles to the electric control unit;
the electric control unit controls the air suspension solenoid valve according to the switching instruction;
or when the double rear axle is switched to the single rear axle, the method comprises the following steps:
The lifting switch sends a switching instruction from the double rear axles to the single rear axle to the electric control unit;
the electric control unit controls the air suspension solenoid valve according to the switching instruction.
On the basis of the technical scheme, the overflow threshold is 7.3bar, the air pressure value of the air suspension electromagnetic valve is 12bar, the working air pressure difference threshold of two air supply interfaces of the static breaking mechanism is 6bar, and the maximum working pressure value inside the bearing air bag and the lifting air bag is 5.5bar;
When the air suspension electromagnetic valve works, one air port of the air suspension electromagnetic valve is deflated outwards, the other air port is inflated to one overflow valve, and the working air pressure difference of the two air supply interfaces of the static breaking mechanism is larger than 6bar.
On the basis of the technical scheme, the first overflow valve and the second overflow valve are both reflux overflow valves, when air flows from any air port of the air suspension electromagnetic valve to the overflow valve for inflating and flows to the bearing air bag or the lifting air bag, the air flow pressure is larger than an overflow threshold value, the overflow valve is conducted, when air flows from any air port of the air suspension electromagnetic valve to deflate, and when the air flows from the bearing air bag or the lifting air bag to the air suspension electromagnetic valve through the overflow valve, the air flow pressure is larger than zero, and the overflow valve is conducted.
The technical scheme provided by the application has the beneficial effects that:
The mechanical control system and the control method integrate the static breaking mechanism and the control air paths of the two air bags, reduce the original two-time electric control program (the first double electromagnetic valve and the air suspension electromagnetic valve) into one-time electric control program (the air suspension electromagnetic valve), improve the control efficiency, reduce the electric elements of the double electromagnetic valve, increase the two electromagnetic valves and integrally reduce the cost, integrate the static breaking mechanism control and the air bag control together, have quicker response, reduce the circuit, reduce the failure rate, and have more stable air path control than circuit control and high system reliability.
The key factor of the mechanical control system is that the relative magnitudes of an overflow threshold value, a working air pressure difference and a maximum working pressure value are skillfully utilized, the air pressure value of the air suspension electromagnetic valve is larger than the overflow threshold value, the overflow threshold value is larger than the maximum working pressure value, and the working air pressure difference of two air supply interfaces of the static breaking mechanism is met when the air suspension electromagnetic valve works. When the first air port of the air suspension electromagnetic valve is inflated to the static breaking mechanism through the second air supply port, the first air supply port is deflated through the second air port, the air pressure difference of the two air supply ports meets the two air supply ports of the air suspension electromagnetic valve, the static breaking mechanism is communicated with the rear movable lifting bridge and the transmission mechanism, almost simultaneously, when the first air port of the air suspension electromagnetic valve is inflated to the bearing air bag through the first overflow valve, the lifting air bag is deflated to the outside through the second overflow valve through the second air port, and the rear movable lifting bridge descends, more importantly, the air path of the static breaking mechanism is closer to the air suspension electromagnetic valve, the state switching of the static breaking mechanism is higher than the air path inflation and deflation of the two air bags, the integrated control air path automatically meets the requirements of controlling the static breaking mechanism and controlling the two air bags first, the design is ingenious, and the air path cost performance of the circuit is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an electrical control system of a prior art rear movable lift bridge;
fig. 2 is a mechanical control system of a rear movable lifting bridge according to an embodiment of the present application.
Reference numeral 1, an air suspension electromagnetic valve, 11, a first air port, 12, a second air port, 2, a static breaking mechanism, 21, a first air supply interface, 22 and a second air supply interface.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. In addition, the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
As shown in FIG. 2, the application discloses an embodiment of a mechanical control system of a rear movable lifting bridge, which adopts a gas circuit mechanical static breaking mechanism control scheme, simplifies control procedures, has low gas circuit failure rate and high system reliability.
Specifically, the double rear axle comprises a rear fixed lifting axle and a rear movable lifting axle, wherein the rear movable lifting axle is positioned at the rearmost part of the transport vehicle, and the technical scheme of the application is mainly aimed at the rear movable lifting axle.
The mechanical control system of the rear movable lifting bridge comprises an air suspension electromagnetic valve 1, a static breaking mechanism 2, a bearing air bag and a lifting air bag. The mechanical control system further includes a first relief valve and a second relief valve, the first relief valve and the second relief valve being newly added unique structures of the present application. The air suspension solenoid valve 1 comprises first air ports 11 and second air ports 12 for alternately discharging air and discharging air. The first air port 11 is connected to the first overflow valve and the bearing air bag in sequence through an air pipe, and the second air port 12 is connected to the second overflow valve and the lifting air bag in sequence through an air pipe.
Specifically, the first port 11, the first relief valve and the carrier airbag form a first branch, and the second port 12, the second relief valve and the lifting airbag form a second branch. The second branch is exhausted when the first branch is inflated, and the second branch is inflated when the first branch is exhausted.
The first air supply port 21 of the static breaking mechanism 2 is connected to the second air port 12 through an air pipe, and the second air supply port 22 of the static breaking mechanism 2 is connected to the first air port 11 through an air pipe.
The first overflow valve and the second overflow valve have the same overflow threshold value, and the reflux threshold value is zero, namely, when the flow is forward, the first branch and the second branch are inflated, and the air flow pressure value is larger than the overflow threshold value, so that the normal inflation can be realized. And when the reverse flow is carried out, the first branch and the second branch are exhausted (exhausted through the first air port 11 and the second air port 12), the resistance formed by the first overflow valve and the second overflow valve is zero, and the lifting air bag and the bearing air bag can be directly exhausted.
The bearing air bag and the lifting air bag have the same maximum working pressure value, the air pressure value of the air outlet of the air suspension electromagnetic valve is larger than the overflow threshold value, the overflow threshold value is larger than the maximum working pressure value, and the working air pressure difference of the two air supply interfaces of the static breaking mechanism is met when the air suspension electromagnetic valve works, namely the actual air pressure difference of the two air supply interfaces of the static breaking mechanism is larger than the working air pressure difference threshold value of the air suspension electromagnetic valve.
In contrast, in the prior art, the electric control scheme needs to control the static breaking mechanism through the duplex electromagnetic valve and then control the two air bags through the air suspension electromagnetic valve, the control of the static breaking mechanism is mainly in an electric control mode, and the duplex electromagnetic valve and the air suspension electromagnetic valve need to control the static breaking mechanism and then control the air bags according to strict time sequence. The mechanical control system combines the two, integrates a static breaking mechanism and control air paths of two air bags, reduces the original two-time electric control program (the first double electromagnetic valve and then the air suspension electromagnetic valve) into one-time electric control program (the air suspension electromagnetic valve), improves the control efficiency, reduces the electric element of the double electromagnetic valve, increases the two electromagnetic valves, and integrally reduces the cost.
The key factor of the mechanical control system is that the relative magnitudes of an overflow threshold value, a working air pressure difference and a maximum working pressure value are skillfully utilized, the air pressure value of the air suspension electromagnetic valve is larger than the overflow threshold value, the overflow threshold value is larger than the maximum working pressure value, and the actual air pressure difference of two air supply interfaces of the static breaking mechanism is larger than the working air pressure difference threshold value when the air suspension electromagnetic valve works. When the first air port 11 of the air suspension electromagnetic valve 1 is inflated to the static breaking mechanism through the second air supply port 22, the first air supply port 21 is deflated through the second air port 12, the air pressure difference of the two air supply ports meets the two air supply ports of the static breaking mechanism, the static breaking mechanism is communicated with the rear movable lifting bridge and the transmission mechanism, almost simultaneously, when the first air port 11 of the air suspension electromagnetic valve 1 is inflated to the bearing air bag through the first overflow valve, the lifting air bag is deflated to the outside through the second overflow valve through the second air port 12, and the rear movable lifting bridge is lowered, more importantly, the air path of the static breaking mechanism is closer to the air suspension electromagnetic valve, the state switching of the static breaking mechanism is higher than the air path inflation and deflation of the two air bags, the integrated control air path automatically meets the requirements of controlling the static breaking mechanism firstly and controlling the two air bags secondly, the design is ingenious, and the circuit air path cost performance ratio is high.
In one embodiment, the mechanical control system further comprises an air handling unit, the air handling unit being connected to an air inlet of the air suspension solenoid valve via an air pipe, the air suspension solenoid valve controlling the flow direction of the air flow via its own first and second air ports. In the actual use process, after the air flow enters the air inlet of the air suspension electromagnetic valve, one of the first air port and the second air port is used for inflating the air bag, and the other air port is used for exhausting.
In one embodiment, the mechanical control system further comprises a lifting switch and an electric control unit, wherein the lifting switch is sequentially connected to the electric control unit and the air suspension electromagnetic valve 1 through a circuit, the lifting switch sends switching instructions of a single rear axle and a double rear axles to the air suspension electromagnetic valve 1 through the electric control unit, and the air suspension electromagnetic valve 1 controls the corresponding first air port 11 or second air port 12 to be inflated according to the switching instructions. Specifically, the single rear axle is switched to the double rear axles, the first air port 11 charges the first branch, the double rear axles are switched to the single rear axle, and the second air port 12 charges the second branch.
Compared with the prior art, the mechanical control system of the application simplifies the connecting circuit of the electric control unit, the electric control unit is respectively connected with the static breaking mechanism, the duplex electromagnetic valve and the air suspension electromagnetic valve through circuits, and the electric control unit is connected with the air suspension electromagnetic valve through only one circuit, thereby simplifying the circuits, simplifying the control program, reducing the circuit failure rate and ensuring that the air circuit control is safer and more reliable.
When the single rear axle is switched to the double rear axles, the air suspension electromagnetic valve 1 receives a switching instruction from the single rear axle to the double rear axles of the electric control unit, the first air port 11 inflates the bearing air bags through the first overflow valve, the second air port 12 deflates the outside, and the static breaking mechanism and the two air bags are controlled. Specifically, the lift bladder is deflated from the second port 12 through the second relief valve, at which time the air flow is reversed through the second relief valve, the return threshold is zero, and the second relief valve is substantially free of resistance.
When the double rear axles are switched to the single rear axle, the air suspension electromagnetic valve 1 receives a switching instruction from the double rear axles of the electric control unit to the single rear axle, the first air port 11 is used for deflating the outside, the second air port 12 is used for inflating the second overflow valve, and then the static breaking mechanism and the two air bags are controlled.
Further, the overflow threshold is 7.3bar, the air pressure value of the air suspension electromagnetic valve is 12bar, the working air pressure difference threshold of the two air supply interfaces of the static breaking mechanism 2 is 6bar, and the maximum working pressure value inside the bearing air bag and the lifting air bag is 5.5bar;
When the air suspension electromagnetic valve works, one air port of the air suspension electromagnetic valve is deflated outwards, and the other air port is inflated to one overflow valve. In the process, the working air pressure difference of the two air supply interfaces of the static breaking mechanism 2 is larger than 6bar, namely the working air pressure difference of the static breaking mechanism 2 starts to work, and the state is switched, namely the movable lifting bridge and the transmission mechanism are moved after the static breaking mechanism 2 is communicated or cut off.
In one embodiment, the first relief valve and the second relief valve are both reflux relief valves, which can meet zero reflux resistance.
When the air flow is discharged from any air port of the air suspension electromagnetic valve 1, the air flow pressure is greater than zero when the air flow flows from the bearing air bag or the lifting air bag to the air suspension electromagnetic valve 1 through the overflow valve, and the overflow valve is conducted.
The application also discloses an embodiment of a control method based on the mechanical control system, which comprises the following steps:
the single rear axle is switched to the double rear axles, or the double rear axles are switched to the single rear axle;
the single rear axle switches to the double rear axles, comprising:
The first air port 11 of the air suspension electromagnetic valve 1 inflates the static breaking mechanism 2 through the second air supply port 22, the first air supply port 21 of the static breaking mechanism 2 deflates the outside through the second air port 12, and the static breaking mechanism 2 is communicated with the movable lifting bridge and the transmission mechanism to realize double-rear-axle driving;
The first air port 11 of the air suspension electromagnetic valve 1 is inflated to the bearing air bag through the first overflow valve, the lifting air bag is deflated from the second air port 12 through the second overflow valve, the rear movable lifting bridge is lowered, and the corresponding tire of the rear movable lifting bridge is landed.
The switching from the dual rear axle to the single rear axle comprises:
the second air port 12 of the air suspension electromagnetic valve 1 inflates the static breaking mechanism 2 through the first air supply port 21, the second air supply port 22 of the static breaking mechanism 2 deflates the outside through the second air port 12, and the static breaking mechanism 2 is disconnected to movably lift the bridge and the transmission mechanism, so that the single rear axle driving is realized.
The second air port 12 of the air suspension electromagnetic valve 1 is inflated to the lifting air bag through the second overflow valve, the bearing air bag is deflated from the first air port 11 through the first overflow valve, the rear movable lifting bridge is lifted, the tires corresponding to the rear movable lifting bridge are suspended from the ground, the load of the vehicle is met, and the abrasion and the oil consumption of the corresponding tires are reduced.
The control method of the mechanical control system integrates the static breaking mechanism and the control air paths of the two air bags, reduces the original two-time electric control program (the first double electromagnetic valve and the air suspension electromagnetic valve) into one-time electric control program (the air suspension electromagnetic valve), improves the control efficiency, reduces the electric elements of the double electromagnetic valve, increases the two electromagnetic valves, and integrally reduces the cost.
The control method of the mechanical control system is characterized in that the relative magnitudes of an overflow threshold value, a working air pressure difference and a maximum working pressure value are ingeniously utilized, the air pressure value of the air outlet of the air suspension electromagnetic valve is larger than the overflow threshold value, the overflow threshold value is larger than the maximum working pressure value, and the actual air pressure difference of two air supply interfaces of the static breaking mechanism is larger than the working air pressure difference threshold value when the air suspension electromagnetic valve works. When the first air port 11 of the air suspension electromagnetic valve 1 is inflated to the static breaking mechanism through the second air supply port 22, the first air supply port 21 is deflated through the second air port 12, the air pressure difference of the two air supply ports meets the two air supply ports of the static breaking mechanism, the static breaking mechanism is communicated with the rear movable lifting bridge and the transmission mechanism, almost simultaneously, when the first air port 11 of the air suspension electromagnetic valve 1 is inflated to the bearing air bag through the first overflow valve, the lifting air bag is deflated to the outside through the second overflow valve through the second air port 12, and the rear movable lifting bridge is lowered, more importantly, the air path of the static breaking mechanism is closer to the air suspension electromagnetic valve, the state switching of the static breaking mechanism is higher than the air path inflation and deflation of the two air bags, the integrated control air path automatically meets the requirements of controlling the static breaking mechanism firstly and controlling the two air bags secondly, the design is ingenious, and the circuit air path cost performance ratio is high.
In one embodiment, the mechanical control system further comprises an air handling unit, the air handling unit being connected to an air inlet of the air suspension solenoid valve via an air pipe, the air suspension solenoid valve controlling the flow direction of the air flow via its own first and second air ports. In the actual use process, after the air flow enters the air inlet of the air suspension electromagnetic valve, one of the first air port and the second air port is used for inflating the air bag, and the other air port is used for exhausting.
In one embodiment, the mechanical control system further comprises a lifting switch and an electric control unit, wherein the lifting switch is sequentially connected to the electric control unit and the air suspension electromagnetic valve 1 through a circuit, the lifting switch sends switching instructions of a single rear axle and a double rear axles to the air suspension electromagnetic valve 1 through the electric control unit, and the air suspension electromagnetic valve 1 controls the corresponding first air port 11 or second air port 12 to be inflated according to the switching instructions. Specifically, the single rear axle is switched to the double rear axles, the first air port 11 charges the first branch, the double rear axles are switched to the single rear axle, and the second air port 12 charges the second branch.
When the single rear axle is switched to the double rear axles, the method comprises the following steps:
The lifting switch sends a switching instruction from a single rear axle to a double rear axles to the electric control unit;
the electronic control unit controls the air suspension solenoid valve 1 according to the switching instruction so as to further carry out subsequent control.
Or when the double rear axle is switched to the single rear axle, the method comprises the following steps:
The lifting switch sends a switching instruction from the double rear axles to the single rear axle to the electric control unit;
the electronic control unit controls the air suspension solenoid valve 1 according to the switching instruction so as to further carry out subsequent control.
In one embodiment, the overflow threshold is 7.3bar, the air pressure value of the air outlet of the air suspension electromagnetic valve is 12bar, the working air pressure difference threshold of the two air supply interfaces of the static breaking mechanism 2 is 6bar, and the maximum working pressure value inside the bearing air bag and the lifting air bag is 5.5bar;
when the air suspension electromagnetic valve works, one air port of the air suspension electromagnetic valve is deflated outwards, the other air port is inflated to one overflow valve, the working air pressure difference of two air supply interfaces of the static breaking mechanism 2 is larger than 6bar, namely the static breaking mechanism 2 enters a working state, state switching is carried out, and the movable lifting bridge and the transmission mechanism are moved after the static breaking mechanism 2 is communicated or cut off.
In one embodiment, the first relief valve and the second relief valve are both reflux relief valves, which can meet zero reflux resistance.
When the air flow is discharged from any air port of the air suspension electromagnetic valve 1, the air flow pressure is greater than zero when the air flow flows from the bearing air bag or the lifting air bag to the air suspension electromagnetic valve 1 through the overflow valve, and the overflow valve is conducted.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intervening medium, or may be in communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a mechanical control system of back activity lift bridge, contains air suspension solenoid valve, quiet disconnected mechanism, bears gasbag and lifts the gasbag, its characterized in that:
The mechanical control system further comprises a first overflow valve and a second overflow valve, and the air suspension electromagnetic valve (1) comprises a first air port (11) and a second air port (12) for alternately discharging and discharging air;
the first air port (11) is sequentially connected with the first overflow valve and the bearing air bag through air pipes, and the second air port (12) is sequentially connected with the second overflow valve and the lifting air bag through air pipes;
the first air supply interface (21) of the static breaking mechanism (2) is connected to the second air port (12) through an air pipe, and the second air supply interface (22) of the static breaking mechanism (2) is connected to the first air port through an air pipe;
The first overflow valve and the second overflow valve have the same overflow threshold value, the backflow threshold value is zero, the bearing air bag and the lifting air bag have the same maximum working pressure value, the air pressure value of the air suspension electromagnetic valve is larger than the overflow threshold value, the overflow threshold value is larger than the maximum working pressure value, and the working air pressure difference of two air supply interfaces of the static breaking mechanism is met when the air suspension electromagnetic valve works.
2. A mechanical control system of a rear mobile lift bridge as set forth in claim 1 wherein said mechanical control system further comprises an air handling unit, said air handling unit being connected by an air line to an air inlet of an air suspension solenoid valve, said air suspension solenoid valve controlling the flow direction of the air flow through its own first (11) and second (12) air ports.
3. The mechanical control system of the rear movable lifting bridge according to claim 1, wherein the mechanical control system further comprises a lifting switch and an electric control unit, wherein the lifting switch is sequentially connected with the electric control unit and the air suspension electromagnetic valve (1) through a circuit, and the lifting switch sends a switching instruction of a single rear axle and a double rear axle to the air suspension electromagnetic valve (1) through the electric control unit;
When the single rear axle is switched to the double rear axles, the air suspension electromagnetic valve (1) receives a switching instruction of the electric control unit, the first air port (11) is inflated to the first overflow valve, the second air port (12) is deflated outwards, and when the double rear axles are switched to the single rear axles, the air suspension electromagnetic valve (1) receives a switching instruction of the electric control unit, the first air port (11) is deflated outwards, and the second air port (12) is inflated to the second overflow valve.
4. A mechanical control system of a rear movable lifting bridge as claimed in claim 1, wherein the overflow threshold is 7.3bar, the air pressure value of the air suspension electromagnetic valve is 12bar, the working air pressure difference threshold of two air supply interfaces of the static breaking mechanism (2) is 6bar, and the maximum working pressure value inside the bearing air bag and the lifting air bag is 5.5bar;
When the air suspension electromagnetic valve works, one air port of the air suspension electromagnetic valve is deflated outwards, the other air port is inflated to one overflow valve, and the working air pressure difference of two air supply interfaces of the static breaking mechanism (2) is larger than 6bar.
5. A mechanical control system of a rear movable lifting bridge as set forth in claim 1, wherein the first overflow valve and the second overflow valve are reflux overflow valves, when the air flows from any air port of the air suspension electromagnetic valve (1) to the overflow valve and flows to the bearing air bag or the lifting air bag, the air flow pressure is larger than the overflow threshold value, the overflow valve is conducted, when the air flows from any air port of the air suspension electromagnetic valve (1) to the outside, the air flow pressure is larger than zero, and when the air flows from the bearing air bag or the lifting air bag to the air suspension electromagnetic valve (1) through the overflow valve, the overflow valve is conducted.
6. A control method based on the machine control system according to claim 1, characterized by comprising the steps of:
the single rear axle is switched to the double rear axles, or the double rear axles are switched to the single rear axle;
the single rear axle to dual rear axles switching comprises:
the first air port (11) of the air suspension electromagnetic valve (1) inflates the static breaking mechanism (2) through the second air supply port (22), the first air supply port (21) of the static breaking mechanism (2) deflates outwards through the second air port (12), and the static breaking mechanism (2) is communicated with the movable lifting bridge and the transmission mechanism;
a first air port (11) of the air suspension electromagnetic valve (1) inflates the bearing air bag through a first overflow valve, and the lifting air bag deflates outwards from a second air port (12) through a second overflow valve;
the switching from the dual rear axle to the single rear axle comprises:
the second air port (12) of the air suspension electromagnetic valve (1) is used for inflating the static breaking mechanism (2) through the first air supply interface (21), the second air supply interface (22) of the static breaking mechanism (2) is used for deflating the outside through the second air port (12), and the static breaking mechanism (2) is disconnected and then is movably lifted to the bridge and the transmission mechanism;
The second air port (12) of the air suspension electromagnetic valve (1) inflates the lifting air bag through the second overflow valve, the bearing air bag deflates the outside from the first air port (11) through the first overflow valve, and the rear movable lifting bridge ascends.
7. The control method of the mechanical control system according to claim 6, wherein the mechanical control system further comprises an air processing unit, the air processing unit is communicated with an air inlet of the air suspension electromagnetic valve through an air pipe, and the air suspension electromagnetic valve (1) controls the air flow direction through a first air port (11) and a second air port (12) of the air suspension electromagnetic valve.
8. The mechanical control system of the rear movable lifting bridge as set forth in claim 6, wherein the mechanical control system further comprises a lifting switch and an electric control unit, wherein the lifting switch is sequentially connected with the electric control unit and the air suspension electromagnetic valve (1) through a circuit, and the lifting switch sends a switching instruction of a single rear axle and a double rear axle to the air suspension electromagnetic valve (1) through the electric control unit;
when the single rear axle is switched to the double rear axles, the method comprises the following steps:
The lifting switch sends a switching instruction from a single rear axle to a double rear axles to the electric control unit;
the electric control unit controls the air suspension electromagnetic valve (1) according to the switching instruction;
or when the double rear axle is switched to the single rear axle, the method comprises the following steps:
The lifting switch sends a switching instruction from the double rear axles to the single rear axle to the electric control unit;
The electric control unit controls the air suspension electromagnetic valve (1) according to the switching instruction.
9. A mechanical control system of a rear movable lifting bridge as claimed in claim 6, wherein the overflow threshold is 7.3bar, the air pressure value of the air suspension electromagnetic valve is 12bar, the working air pressure difference threshold of two air supply interfaces of the static breaking mechanism (2) is 6bar, and the maximum working pressure value inside the bearing air bag and the lifting air bag is 5.5bar;
When the air suspension electromagnetic valve works, one air port of the air suspension electromagnetic valve is deflated outwards, the other air port is inflated to one overflow valve, and the working air pressure difference of two air supply interfaces of the static breaking mechanism (2) is larger than 6bar.
10. A mechanical control system of a rear movable lifting bridge as set forth in claim 6, wherein the first overflow valve and the second overflow valve are reflux overflow valves, when the air flows from any air port of the air suspension electromagnetic valve (1) to the overflow valve and flows to the bearing air bag or the lifting air bag, the air flow pressure is larger than the overflow threshold value, the overflow valve is conducted, when the air flows from any air port of the air suspension electromagnetic valve (1) to the outside, the air flow pressure is larger than zero, and when the air flows from the bearing air bag or the lifting air bag to the air suspension electromagnetic valve (1) through the overflow valve, the overflow valve is conducted.
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| CN202210879319.0A CN115056623B (en) | 2022-07-25 | 2022-07-25 | Mechanical control system and control method of rear movable lifting bridge |
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| CN202210879319.0A CN115056623B (en) | 2022-07-25 | 2022-07-25 | Mechanical control system and control method of rear movable lifting bridge |
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| CN115056623B true CN115056623B (en) | 2025-06-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115519956A (en) * | 2022-10-13 | 2022-12-27 | 东风商用车有限公司 | 6X 4R tractor drive axle power system |
| CN117207731A (en) * | 2023-09-28 | 2023-12-12 | 东风商用车有限公司 | An engineering vehicle lifting axle air control system |
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| CN104044427A (en) * | 2014-07-07 | 2014-09-17 | 中国重汽集团济南动力有限公司 | Three-axle passenger car lifting bridge control system |
| CN216401103U (en) * | 2021-11-10 | 2022-04-29 | 芜湖中集瑞江汽车有限公司 | Multi-mode air suspension device |
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| JP2006248291A (en) * | 2005-03-09 | 2006-09-21 | Dora:Kk | Vehicle height adjusting device for air suspension vehicle |
| DE102010003463B4 (en) * | 2010-03-30 | 2013-11-14 | Haldex Brake Products Gmbh | Pneumatic units for air suspension systems |
| DE102011114179B4 (en) * | 2011-09-22 | 2022-08-18 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Valve device for an air suspension device of a vehicle for decoupling air spring bellows on different sides of the vehicle |
| CN108839533B (en) * | 2018-06-20 | 2023-06-23 | 东风商用车有限公司 | Mechanical air suspension control system and control method thereof |
| CN110126576B (en) * | 2019-06-20 | 2025-06-20 | 东风华神汽车有限公司 | An air control system with a lifting bridge air suspension system |
| CN112793376B (en) * | 2021-03-27 | 2025-01-28 | 山东九州汽车制造有限公司 | An air suspension air circuit control system with lifting airbag |
| CN214420167U (en) * | 2021-03-27 | 2021-10-19 | 山东九州汽车制造有限公司 | Air suspension air circuit control system with lifting air bag |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104044427A (en) * | 2014-07-07 | 2014-09-17 | 中国重汽集团济南动力有限公司 | Three-axle passenger car lifting bridge control system |
| CN216401103U (en) * | 2021-11-10 | 2022-04-29 | 芜湖中集瑞江汽车有限公司 | Multi-mode air suspension device |
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