A rear suspension safety locking method

Abstract

The application provides a rear suspension safety locking method, relates to the technical field of new energy trucks, and comprises the following steps: when the new energy truck is started, if the cab bottom beam is clamped in the lock buckle, the height valve obtains the suspension distance between the rear suspension upper beam and the rear suspension lower beam in real time; when the suspension distance is greater than a first predetermined threshold, the buffer air bag is deflated; when the suspension distance is smaller than the first predetermined threshold, the buffer air bag is inflated until the distance between the rear suspension upper beam and the rear suspension lower beam is stable; whether the difference between the buffer distances of the two buffer rods is not greater than a second predetermined threshold is judged, if yes, the lock valve locks the cab bottom beam in the lock buckle; otherwise, no operation is performed. Through the buffer air bag and the buffer rod in the rear suspension structure, the application effectively buffers the process of lowering the carriage, effectively identifies the safety of the carriage when the carriage is lowered, locks the rear suspension under the condition of ensuring the safety of the center of gravity of the carriage, effectively prevents the cab carriage from overturning, and is high in safety.

Description

Technical Field

[0001] This invention relates to the field of new energy truck technology, and in particular, to a rear suspension safety locking method. Background Technology

[0002] Freight trucks, also known as cargo trucks or lorries, are vehicles primarily used for transporting goods, and sometimes also refer to vehicles capable of towing other vehicles. They belong to the category of commercial vehicles. They are generally classified into heavy-duty and light-duty types based on their weight. The vast majority of freight trucks are powered by diesel engines, but some light-duty trucks use gasoline, LPG, or natural gas. With the large-scale development of new energy technologies in China, some freight trucks are also using electric power or other new energy sources.

[0003] Because new energy trucks have better acceleration and deceleration performance, the requirements for shock absorption and collision protection are higher. The cabs of new energy trucks generally adopt a suspension system structure for shock absorption and collision protection. The cab suspension system includes a front suspension assembly located between the lower front part of the cab and the frame, and a rear suspension assembly located between the lower rear part of the cab and the frame. It mainly plays a role in supporting the cab, preventing rollover and anti-rollover, while attenuating the vibration and impact transmitted to the cab by uneven road surfaces during vehicle operation, guiding the vertical movement of the cab relative to the ground, limiting the cab's roll and yaw movements, and improving ride comfort.

[0004] Current rear suspension assemblies typically have multiple buffer components that can only maintain the balance and cushioning of the cab and cab after they are lowered. However, during the raising and lowering of the cab and cab, the rear suspension assembly is almost ineffective. In particular, if the cab and cab deviate from their center of gravity the moment they land on the rear suspension assembly, and the lifting cylinders close, it may cause damage to the rear suspension assembly or even the cab to overturn, resulting in personal injury and property damage.

[0005] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable rear suspension safety locking method. Summary of the Invention

[0006] The purpose of this invention is to provide a rear suspension safety locking method, which effectively buffers the descent of the cab by using a buffer airbag and buffer bar in the rear suspension structure, effectively identifies the safety of the cab when the cab is lowered, and locks the rear suspension while ensuring the safety of the cab's center of gravity, effectively preventing the cab and cab from overturning, thus ensuring high safety.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A rear suspension safety locking method is applicable to a rear suspension safety locking structure, including a rear suspension upper beam and a rear suspension lower beam, wherein the rear suspension upper beam and the rear suspension lower beam are connected by two left-right symmetrical buffer units, wherein the buffer unit includes a buffer airbag and a buffer rod; a height valve is provided at the buffer airbag, and a latch for connecting to the cab floor beam is provided on the rear suspension upper beam, wherein a locking valve is provided inside the latch;

[0009] The method includes the following steps:

[0010] S1: When the new energy truck starts, determine whether the cab floor beam is engaged in the latch. If so, proceed to step S2; otherwise, do not proceed.

[0011] S2: The height valve obtains the suspension distance between the upper and lower rear suspension beams in real time; when the suspension distance is greater than a first predetermined threshold, the buffer airbag is deflated; and when the suspension distance is less than the first predetermined threshold, the buffer airbag is inflated until the distance between the upper and lower rear suspension beams is stable.

[0012] S3: Determine whether the difference in buffer distance between the two buffer bars is not greater than the second predetermined threshold. If so, the locking valve will lock the cab floor beam in the latch; otherwise, no operation will be performed.

[0013] As a preferred embodiment of the present invention, the buffer airbag is disposed between the end of the upper rear suspension beam and the end of the lower rear suspension beam; the number of height valves is also two, and the height valve includes a height rod disposed at the connection between the upper rear suspension beam and the buffer airbag and extending toward the lower rear suspension beam, and a sensing valve disposed on the lower rear suspension beam for obtaining the height of the height rod.

[0014] As a preferred embodiment of the present invention, before performing step S2, the distance L between the center point of the rear suspension upper beam and the buffer airbag is obtained;

[0015] This ensures that during step S2,

[0016] The inflation / deflation volume P of the airbag is ΔH*L / a;

[0017] Where: ΔH is the difference between the suspension spacing and the first predetermined threshold; a is the cargo loading coefficient of the truck.

[0018] As a preferred embodiment of the present invention, step S2 is specifically performed as follows:

[0019] S21: The height valve obtains the suspension distance between the end of the upper rear suspension beam and the end of the lower rear suspension beam;

[0020] S22: The airbag inflation / deflation volume is calculated based on the suspension distance;

[0021] S23: Determine whether the change in the height valve measurement reading is greater than the third predetermined threshold. If so, return to step S21; otherwise, the airbag adjustment is complete, and step S24 is executed.

[0022] S24: After both airbags are adjusted, the distance between the two ends of the upper and lower rear suspension beams is stable.

[0023] As a preferred embodiment of the present invention, during the execution of steps S21 to S23, the two buffer airbags are controlled and adjusted individually.

[0024] As a preferred embodiment of the present invention, the distance between the middle part of the lower rear suspension beam and the upper rear suspension beam is less than the distance between the end of the lower rear suspension beam and the upper rear suspension beam, so that the left and right inclined beams of the lower rear suspension beam form an inverted V-shaped component; the buffer rod is inclinedly disposed between the inclined beam and the upper rear suspension beam.

[0025] As a preferred embodiment of the present invention, before performing step S3, a second predetermined threshold is generated based on the new energy truck model.

[0026] As a preferred embodiment of the present invention, the locking valve is a hydraulic valve.

[0027] When performing step S3, if the difference in the buffer distance between the two buffer rods is not greater than the second predetermined threshold, the center of gravity shift of the cab floor beam of the new energy truck is controllable, and the cab floor beam lock and latch are fixed by the hydraulic valve, and the cab lifting cylinder is closed; otherwise, if the difference in the buffer distance between the two buffer rods is greater than the second predetermined threshold, the hydraulic valve does not work.

[0028] As a preferred embodiment of the present invention, when the new energy truck starts up during step S1, if the latch does not engage with the cab floor beam, a level one alarm is issued.

[0029] As a preferred embodiment of the present invention, when performing step S3, if the difference in the buffer distance between the two buffer rods is greater than a second predetermined threshold, a secondary alarm is issued.

[0030] The beneficial effects of the rear suspension safety locking method of the present invention are as follows:

[0031] The rear suspension structure effectively cushions the descent of the cab by using airbags and shock absorbers. It also effectively identifies the safety of the cab during descent and locks the rear suspension while ensuring the safety of the cab's center of gravity, thus effectively preventing the cab from overturning and ensuring high safety. Attached Figure Description

[0032] Figure 1 This is a flowchart illustrating a rear suspension safety locking method according to the present invention.

[0033] Figure 2 This is a schematic diagram of a rear suspension safety locking structure according to the present invention. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement of modules and structures set forth in these embodiments does not limit the scope of the invention.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0037] Techniques, methods, and systems known to a person skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the license specification.

[0038] Example 1: As Figure 1 , 2 The image shown is merely one embodiment of the present invention, a rear suspension safety locking method applicable to a rear suspension safety locking structure, including a rear suspension upper beam 1 and a rear suspension lower beam 2, the rear suspension upper beam and the rear suspension lower beam being connected by two left-right symmetrical buffer units, the buffer unit including a buffer airbag 3 and a buffer rod 4; a height valve 5 is provided at the buffer airbag 3, and a latch 6 for connecting to the cab floor beam is provided on the rear suspension upper beam 1, the latch containing a locking valve;

[0039] The method includes the following steps:

[0040] S1: When the new energy truck starts, determine whether the cab floor beam is engaged in the latch. If so, proceed to step S2; otherwise, do not proceed.

[0041] S2: The height valve obtains the suspension distance between the upper and lower rear suspension beams in real time; when the suspension distance is greater than a first predetermined threshold, the buffer airbag is deflated; and when the suspension distance is less than the first predetermined threshold, the buffer airbag is inflated until the distance between the upper and lower rear suspension beams is stable.

[0042] S3: Determine whether the difference in buffer distance between the two buffer bars is not greater than the second predetermined threshold. If so, the locking valve will lock the cab floor beam in the latch; otherwise, no operation will be performed.

[0043] In this invention, when the new energy truck is started, that is, when the new energy truck needs to be used, there are only two possibilities. The first is that the cab and the truck body are already in the lowered state; the second is that the cab and the truck body have been repaired and maintained, and the cab lifting cylinder needs to drive the cab and the truck body to be lowered immediately. In either case, the solution of this invention can be implemented. Therefore, when executing step S1, it can be understood that: regardless of whether the truck body is in the lowered state or the truck body structure has been repaired and lowered, there will be a certain result: the cab bottom beam is engaged in the latch.

[0044] In other words, once the cab floor beam is engaged in the latch, it can be considered that the vehicle body has been lowered onto the rear suspension assembly, and the rear suspension treatment in step S2 is performed; conversely, if the cab floor beam is not engaged in the latch, it can be considered that the vehicle body has not been lowered, and the suspension treatment step is not performed.

[0045] Then comes step S2: After the cab floor beam is engaged in the latch, the rear suspension assembly will suddenly experience additional load-bearing pressure. At this time, the cab floor beam will fall onto the rear suspension upper beam 1, and the weight of the passenger compartment will press on the rear suspension upper beam. At this time, the buffer rod will be compressed first to buffer the passenger compartment. Then, the height of the rear suspension upper beam after being pressed down (relative to the height of the rear suspension lower beam) can be determined through the height valve 5.

[0046] The first predetermined threshold refers to the distance between the upper and lower rear suspension beams when the new energy truck is stationary on a level ground and the cargo box is in the lowered state. At this time, the gravity on the upper rear suspension beam can also be considered as the standard gravity value.

[0047] If the height valve detects that the suspension distance between the upper and lower rear suspension beams is less than a first predetermined value, it indicates that the weight on the upper rear suspension beam at this point is greater than the standard weight value. In this case, the airbag needs to be inflated to push the upper rear suspension beam upward. Conversely, if the height valve detects that the suspension distance between the upper and lower rear suspension beams is greater than the first predetermined value, it indicates that the weight on the upper rear suspension beam at this point is less than the standard weight value. In this case, the airbag needs to be deflated, and the upper rear suspension beam will naturally descend.

[0048] Of course, if the height valve obtains that the suspension distance between the upper and lower rear suspension beams is equal to the first predetermined value, it means that the gravity on the upper rear suspension beam is the standard gravity value, and the airbag does not need to be inflated or deflated.

[0049] Furthermore, the inflation and deflation of the airbag is not intended to completely equalize the suspension distance between the upper and lower rear suspension beams to the first predetermined value, but rather to bring the suspension distance closer to the first predetermined value, ensuring that the upper and lower rear suspension beams maintain balance.

[0050] Understandably, step S2 is to buffer and level the carriage when it is lowered.

[0051] Finally, in step S3: After the airbags cushion and level the cargo box, if the difference in the cushioning distance between the two airbags is not greater than the second predetermined threshold, the center of gravity offset of the cab floor beam of the new energy truck is small, the center of gravity offset is controllable, the lifting cylinder is closed, and the cargo box will not overturn. At this time, the hydraulic valve completes the fixing of the cab floor beam lock and latch, and the cab floor beam of the cargo box is successfully connected to the rear suspension assembly, that is, the rear suspension is locked, and the cab lifting cylinder is closed. Conversely, if the difference in the cushioning distance between the two airbags is greater than the second predetermined threshold, the center of gravity offset of the cab floor beam of the new energy truck is large, the center of gravity offset is uncontrollable, and if the lifting cylinder is closed, there is a risk of the cargo box overturning. At this time, the hydraulic valve does not work, the lifting cylinder is not closed, and the lifting cylinder still needs to provide support for the cargo box. At this time, the lifting cylinder and the rear suspension assembly together support the cargo box, and an alarm is issued to notify safety personnel to confirm the safety of the cargo box.

[0052] The present invention discloses a rear suspension safety locking method that effectively buffers the descent of the cab by using a buffer airbag and buffer rod in the rear suspension structure. It also effectively identifies the safety of the cab when the cab is lowered and locks the rear suspension while ensuring the safety of the cab's center of gravity, thus effectively preventing the cab from overturning and ensuring high safety.

[0053] Example 2: As before Figure 1 , 2 As shown, this is only one embodiment of the present invention. Based on the first embodiment, in the rear suspension safety locking method of the present invention, the buffer airbag 3 is disposed between the end of the upper rear suspension beam 1 and the end of the lower rear suspension beam 2; the number of height valves 5 is also two. The height valve 5 includes a height rod disposed at the connection between the upper rear suspension beam 1 and the buffer airbag 3 and extending toward the lower rear suspension beam 2, and a sensing valve disposed on the lower rear suspension beam 2 for obtaining the height of the height rod.

[0054] Furthermore, before executing step S2, the distance L between the center point of the rear suspension upper beam and the buffer airbag is obtained;

[0055] This ensures that during step S2,

[0056] The inflation / deflation volume P of the airbag is ΔH*L / a;

[0057] Where: ΔH is the difference between the suspension spacing and the first predetermined threshold; a is the cargo loading coefficient of the truck.

[0058] In this invention, when performing step S2, the specific steps are as follows:

[0059] S21: The height valve obtains the suspension distance between the end of the upper rear suspension beam and the end of the lower rear suspension beam;

[0060] S22: The airbag inflation / deflation volume is calculated based on the suspension distance;

[0061] S23: Determine whether the change in the height valve measurement reading is greater than the third predetermined threshold. If so, return to step S21; otherwise, the airbag adjustment is complete, and step S24 is executed.

[0062] S24: After both airbags are adjusted, the distance between the two ends of the upper and lower rear suspension beams is stable.

[0063] Of course, during steps S21 to S23, the two airbags are controlled and adjusted separately.

[0064] Example 3: As before Figure 1 , 2 As shown, this is merely one embodiment of the present invention. Based on any of the above embodiments, in a rear suspension safety locking method of the present invention, the distance between the middle part of the rear suspension lower beam 2 and the rear suspension upper beam 1 is less than the distance between the end of the rear suspension lower beam 2 and the rear suspension upper beam 1, so that the left and right inclined beams of the rear suspension lower beam 2 form an inverted V-shaped component; the buffer rod 4 is inclinedly disposed between the inclined beam and the rear suspension upper beam 1.

[0065] Furthermore, before executing step S3, a second predetermined threshold is generated based on the new energy truck model.

[0066] In this invention, the locking valve is a hydraulic valve.

[0067] When performing step S3, if the difference in the buffer distance between the two buffer rods is not greater than the second predetermined threshold, the center of gravity shift of the cab floor beam of the new energy truck is controllable, and the cab floor beam lock and latch are fixed by the hydraulic valve, and the cab lifting cylinder is closed; otherwise, if the difference in the buffer distance between the two buffer rods is greater than the second predetermined threshold, the hydraulic valve does not work.

[0068] Finally, when performing step S1, if the latch does not engage with the cab floor beam when the new energy truck starts, a level one alarm will be issued.

[0069] When performing step S3, if the difference in buffer distance between the two buffer rods is greater than the second predetermined threshold, a level two alarm will be issued.

[0070] The present invention discloses a rear suspension safety locking method that effectively buffers the descent of the cab by using a buffer airbag and buffer rod in the rear suspension structure. It also effectively identifies the safety of the cab when the cab is lowered and locks the rear suspension while ensuring the safety of the cab's center of gravity, thus effectively preventing the cab from overturning and ensuring high safety.

[0071] This invention is not limited to the specific embodiments described above, and various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of this invention should be included within the scope of protection of this invention.

Claims

1. A rear suspension safety locking method, characterized in that: It is suitable for a rear suspension safety locking structure, which comprises a rear suspension upper beam (1) and a rear suspension lower beam (2), the rear suspension upper beam and the rear suspension lower beam are connected through two left-right symmetrical buffer units, the buffer unit comprises a buffer air bag (3) and a buffer rod (4); the buffer air bag (3) is provided with a height valve (5), the rear suspension upper beam (1) is provided with a lock catch (6) for connecting with the cab bottom beam, and the lock catch is provided with a locking valve; The method comprises the following steps: S1: When the new energy truck starts, it is judged whether the lock catch is clamped with the cab bottom beam, if yes, step S2 is executed; otherwise, no operation is performed; S2: The height valve obtains the suspension distance between the rear suspension upper beam and the rear suspension lower beam in real time; when the suspension distance is greater than a first predetermined threshold, the buffer air bag is deflated; and when the suspension distance is less than the first predetermined threshold, the buffer air bag is inflated until the distance between the rear suspension upper beam and the rear suspension lower beam is stable; S3: It is judged whether the difference between the buffer distances of the two buffer rods is not greater than a second predetermined threshold, if yes, the locking valve locks the cab bottom beam in the lock catch; otherwise, no operation is performed.

2. The method of claim 1, wherein: The buffer air bag (3) is arranged between the end of the rear suspension upper beam (1) and the end of the rear suspension lower beam (2); the number of the height valves (5) is also two, the height valve (5) comprises a height rod arranged at the connection between the rear suspension upper beam (1) and the buffer air bag (3) and extending towards the rear suspension lower beam (2), and a sensing valve arranged on the rear suspension lower beam (2) for obtaining the height of the height rod.

3. The method of claim 2, wherein: Before step S2 is executed, the distance L between the center point of the rear suspension upper beam and the buffer air bag is obtained; When step S2 is executed, The inflation and deflation amount P of the buffer air bag is ΔH*L / a; Wherein: ΔH is the difference between the suspension distance and the first predetermined threshold; a is the truck load coefficient value.

4. The method of claim 3, wherein: When step S2 is executed, specifically: S21: The height valve obtains the suspension distance between the end of the rear suspension upper beam and the end of the rear suspension lower beam; S22: The buffer air bag calculates the inflation and deflation amount according to the suspension distance; S23: It is judged whether the change value of the height valve measurement reading is greater than a third predetermined threshold, if yes, return to step S21; otherwise, the buffer air bag is adjusted, and step S24 is executed; S24: After both buffer air bags are adjusted, the distance between the two ends of the rear suspension upper beam and the rear suspension lower beam is stable.

5. The method of claim 4, wherein: When steps S21 to S23 are executed, the two buffer air bags are controlled and adjusted separately.

6. The method of claim 2, wherein: The distance between the middle of the rear suspension lower beam (2) and the rear suspension upper beam (1) is less than the distance between the end of the rear suspension lower beam (2) and the rear suspension upper beam (1), so that the left and right two inclined beams of the rear suspension lower beam (2) form an inverted V-shaped member; the buffer rod (4) is inclinedly arranged between the inclined beam and the rear suspension upper beam (1).

7. A rear suspension safety locking method according to claim 6, characterized in that: Before step S3 is executed, the second predetermined threshold is generated according to the new energy truck model.

8. The method of claim 7, wherein: The locking valve is a hydraulic valve, In the execution step S3, if the difference of the buffer distances of the two buffer rods is not greater than the second predetermined threshold, the cab bottom beam gravity center of the new energy truck is controllable, the fixing of the cab bottom beam lock and the lock catch is completed through the hydraulic valve, and the cab lifting cylinder is closed; otherwise, if the difference of the buffer distances of the two buffer rods is greater than the second predetermined threshold, the hydraulic valve does not work.

9. The method of claim 1, wherein: In the execution step S1, when the new energy truck starts, if the lock catch does not have the cab bottom beam clamped in, a first level alarm is sent.

10. The method of claim 1, wherein: In the execution step S3, if the difference of the buffer distances of the two buffer rods is greater than the second predetermined threshold, a second level alarm is sent.

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