Light truck centering method

Abstract

The invention discloses a light truck centering method and belongs to the technical field of new energy automobile battery swap stations. According to the scheme, a preset centering position is set, a push plate on one side of an automobile reaches the preset centering position, preliminary correction of the whole automobile body is achieved, then, a push plate on the other side moves to the preset centering position, and the whole automobile body is corrected. According to the method, basic correction of the whole vehicle body can be achieved, then all push plates run, when each push plate feeds back to reach the clamping torque, centering of the vehicle is completed, and the method comprises the two stages of rough position centering and torque feedback centering, so that the centering precision is greatly improved. Therefore, the problem of wheel damage easily caused by an absolute distance mode for judging the walking distance in the background technology can be avoided, and the problem of overlarge vehicle centering position deviation easily caused by different gravities borne by different wheels of the vehicle in a traditional torque centering mode can also be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy vehicle battery replacement stations, and in particular relates to a light truck centering method. Background Art

[0002] At present, the commonly used wheel alignment and fixing methods in battery swap stations usually include the following two methods:

[0003] (1) Travel distance judgment: The servo mechanism starts from the initial position (zero position) and moves the set distance (working stroke). This method has high centering accuracy, but poor flexibility. The clamping position cannot be adjusted according to the specific state of the vehicle. At the same time, there is a lack of torque protection for wheel clamping, which may cause the centering push plate to damage the wheel or even cause the wheel to come out of position.

[0004] (2) Traditional torque alignment: Torque alignment is highly flexible and can be adapted to a variety of vehicle types and conditions. In torque mode, the mechanism exhibits a characteristic inversely proportional to the output torque and the operating speed. The closer the torque is to the limit value, the slower the movement speed. Due to the influence of tire pressure changes caused by light truck load, changes in the center of gravity of the vehicle, and the lubrication degree of the alignment mechanism, the speed of the two sides of the push plate in the alignment mechanism will be inconsistent, which will affect the alignment accuracy.

[0005] As for light trucks (vans), due to the cargo in the cargo compartment, in order to ensure the carrying capacity of the vehicle, the wheel layout is mostly 2 in the front and 4 in the rear. However, due to the influence of the weight of the cargo, the pressure on the rear wheels of the vehicle is greater than that on the front wheels, and the wheels will become flat to varying degrees depending on the weight and position of the cargo.

[0006] Due to the factors that may affect the light trucks, such as the large difference in front and rear wheel widths and the different degrees of wheel flatness, the above-mentioned wheel alignment method is prone to cause problems such as excessive deviation in the four-wheel alignment position and damage to the tires. Furthermore, during the battery removal process, the RGV and the body battery are also prone to problems such as being unable to properly position and contact due to deviation. In severe cases, there is a risk that the vehicle will be lifted up by the RGV. Summary of the invention

[0007] The object of the present invention is to provide a light truck centering method to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, a technical solution adopted by the present invention is: a light truck centering method, wherein a centering mechanism on a vehicle battery swapping platform is provided with a push plate capable of pushing the wheel from the outside of the wheel to a preset centering position and a standard centering position, and there is a gap between the preset centering position and the standard centering position, and the standard centering position is the position of the push plate when the vehicle is parked on the battery swapping station and can be replaced with a battery, and the push plate preferentially reaches the preset centering position, specifically comprising the following steps:

[0009] S1: Park the vehicle on the vehicle battery swap platform, and ensure that the front and rear wheels of the vehicle at the parking position can be pushed by the push plate of the centering mechanism on the vehicle battery swap platform;

[0010] S2: The two push plates corresponding to the front and rear wheels on one side of the vehicle move at the same speed until the two push plates reach a preset centering position and stop;

[0011] S3: The two push plates corresponding to the front and rear wheels on the other side of the vehicle move at the same speed until the two push plates reach a preset centering position and stop;

[0012] S4: Set the clamping torque when the push plate clamps the wheel. All push plates on both sides of the vehicle run at the same speed. When the torque fed back by each push plate reaches the clamping torque, the push plate stops until all push plates reach the clamping torque.

[0013] Preferably, before step S2, if the front and rear wheel tracks of the vehicle are different, the two push plates corresponding to the wheels with smaller wheel tracks each move a distance of half the wheel track difference first, where the wheel track is the distance between the outer sides of the outermost wheels of the front or rear wheels of the vehicle.

[0014] Preferably, before the push plate reaches the preset position, the torque limit of the operation of the push plate is constant.

[0015] Preferably, the running speed of the push plate in step S4 is lower than the running speed of the push plate before step S4.

[0016] Preferably, the distance between the preset centering position and the standard centering position is less than 20 mm.

[0017] Preferably, an error range of the standard centering position is set, and after step S4, it is necessary to detect whether the positions of all push plates are within the error range of the standard centering position.

[0018] Preferably, a position monitoring sensor is provided on the vehicle battery exchange platform. After the vehicle is centered, the position monitoring sensor monitors the vehicle status in real time. A movement error is set, and when the vehicle movement trajectory exceeds the movement error, the position monitoring sensor provides feedback.

[0019] Preferably, the centering mechanism comprises a V-shaped centering roller, and a group of wheels away from the center of gravity of the vehicle enters the V-shaped centering roller.

[0020] Beneficial effects of the present invention: This solution sets a preset centering position so that the push plate on one side of the vehicle reaches the preset centering position, thereby achieving preliminary correction of the entire vehicle body. Then, the push plate on the other side runs to the preset centering position, thereby achieving basic correction of the entire vehicle body. Subsequently, all the push plates run, and when each push plate feedbacks the reaching of the clamping torque, the centering of the vehicle is completed. In this method, it is divided into two stages: position rough centering and torque feedback centering. In this way, it can avoid the problem of wheel damage caused by the absolute distance method of judging the walking distance in the background technology, and can also avoid the problem of excessive deviation of the vehicle centering position caused by different gravity borne by different wheels of the vehicle in the traditional torque centering method.

[0021] Among them, affected by the vehicle model, in some light trucks, due to the heavy load in the vehicle compartment, tires will be added to the rear wheels to increase the load-bearing capacity of the wheels, which will cause the wheel tracks of the front and rear wheels to be different. Therefore, in order to ensure the centering effect, before step S2, the two push plates corresponding to the small wheel track wheels need to be adjusted to move half the wheel track difference respectively.

[0022] Among them, since the feedback force of the wheel pushed by the push plate is greater, the running speed of the push plate will be relatively slower under the same power. Therefore, by setting the running speed of the push plate in step S4 to be lower than the running speed of the push plate before step S4, within a reasonable speed range, the running speeds of the four push plates can be effectively guaranteed to be relatively consistent, which can reduce the possibility of vehicle body tilting and ensure the centering effect of the vehicle.

[0023] Among them, the commonly used platform for carrying the battery locking and unlocking mechanism can have a floating error range of 35mm on the horizontal plane. Therefore, setting a 20mm spacing between the preset centering position and the standard centering position can effectively ensure smooth centering;

[0024] Among them, the V-shaped roller can effectively reduce the possibility of wheel detachment. During the operation of the push plate, a group of wheels away from the center of gravity of the vehicle are more easily pushed, resulting in inconsistent operating speeds of the front and rear wheel push plates, which makes the vehicle centering process prone to deviation and even causes wheel detachment, making it impossible to center the vehicle. Therefore, this situation can be effectively avoided by placing a group of wheels away from the center of gravity of the vehicle in the V-shaped centering roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is an operation flow chart of the method of the present invention;

[0026] Figure 2 It is a schematic diagram of the position of the push plate when the vehicle stops on the vehicle battery exchange platform in the method of the present invention;

[0027] Figure 3It is a schematic diagram of the position of the push plate performing the first step of the method of the present invention under different wheel widths of the front and rear wheels;

[0028] Figure 4 It is a schematic diagram of the position of the push plate performing the second step action under different conditions of the front and rear wheel tracks in the method of the present invention;

[0029] Figure 5 It is a schematic diagram of the position of the push plate performing the third step action under different wheel widths of the front and rear wheels in the method of the present invention;

[0030] Figure 6 It is a schematic diagram of the position of the push plate in the fourth step of the method of the present invention under different wheelbase conditions of the front and rear wheels;

[0031] 1. Vehicle battery replacement platform; 2. Wheels; 3. V-shaped rollers; 4. Push plates. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] Example:

[0034] See also Figure 1-Figure 6 A method for centering a light truck, wherein a centering mechanism on a vehicle battery swapping platform is provided with a push plate capable of pushing the wheel from the outside of the wheel to a preset centering position and a standard centering position, wherein there is a gap between the preset centering position and the standard centering position, wherein the standard centering position is the position of the push plate when the vehicle is parked on the battery swapping platform and can be used for battery swapping, and the push plate preferentially reaches the preset centering position, specifically comprising the following steps:

[0035] S1: Park the vehicle on the vehicle battery swap platform, and ensure that the front and rear wheels of the vehicle at the parking position can be pushed by the push plate of the centering mechanism on the vehicle battery swap platform ( Figure 2 );

[0036] S2: Subsequently, if the front and rear wheel tracks of the vehicle are the same, the two push plates corresponding to the front and rear wheels on one side of the vehicle move at the same speed until the two push plates reach a preset centering position and stop;

[0037] If the front and rear wheel tracks of the vehicle are different, the two push plates corresponding to the wheels with smaller wheel tracks will first move half the distance of the wheel track difference ( Figure 3 ), then the two push plates corresponding to the front and rear wheels on one side of the vehicle move at the same speed until the two push plates reach the preset centering position and stop ( Figure 4 ), the wheelbase is the distance between the outer sides of the outermost wheels of the front or rear wheels of the vehicle;

[0038] S3: The two push plates corresponding to the front and rear wheels on the other side of the vehicle move at the same speed until the two push plates reach the preset centering position and stop ( Figure 5 );

[0039] S4: Set the clamping torque when the push plate clamps the wheel. All push plates on both sides of the vehicle run at the same speed. When the torque feedback from each push plate reaches the clamping torque, the push plate stops until all push plates reach the clamping torque ( Figure 6 );

[0040] S5: Set the error range of the standard centering position and detect whether the positions of all push plates are within the error range of the standard centering position before the battery replacement process can be carried out.

[0041] Before the push plate reaches the preset position, the torque limit of the operation of the push plate is constant.

[0042] The running speed of the push plate in step S4 is lower than the running speed of the push plate before step S4.

[0043] Among them, the distance between the preset centering position and the standard centering position is less than 20 mm. Specifically, in a commonly used platform carrying a battery locking and unlocking mechanism, there may be a floating error range of 35 mm on the horizontal plane. Therefore, setting a distance of 20 mm between the preset centering position and the standard centering position can effectively ensure smooth centering.

[0044] Among them, a position monitoring sensor is arranged on the vehicle battery exchange platform. After the vehicle is centered, the position monitoring sensor monitors the vehicle status in real time. A movement error is set, and when the vehicle movement trajectory exceeds the movement error, the position monitoring sensor provides feedback.

[0045] Among them, the centering mechanism includes a V-shaped centering roller, and a group of wheels away from the center of gravity of the vehicle enters the V-shaped centering roller. This is because during the operation of the push plate, the group of wheels away from the center of gravity of the vehicle is more easily pushed, which leads to inconsistent running speeds of the front and rear wheel push plates, making the vehicle centering process prone to deviation and even causing the wheels to detach, making it impossible to center the vehicle. Therefore, this situation can be effectively avoided by placing the group of wheels away from the center of gravity of the vehicle in the V-shaped centering roller.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for centering a light truck, characterized in that: The centering mechanism on the vehicle battery swapping platform is provided with a push plate capable of pushing the wheel from the outside of the wheel to a preset centering position and a standard centering position. There is a gap between the preset centering position and the standard centering position. The standard centering position is the position of the push plate when the vehicle is parked on the battery swapping station and can be replaced. The push plate preferentially reaches the preset centering position. The centering method specifically includes the following steps: S1: Park the vehicle on the vehicle battery swap platform, and ensure that the front and rear wheels of the vehicle at the parking position can be pushed by the push plate of the centering mechanism on the vehicle battery swap platform; S2: The two push plates corresponding to the front and rear wheels on one side of the vehicle move at the same speed until the two push plates reach a preset centering position and stop; S3: The two push plates corresponding to the front and rear wheels on the other side of the vehicle move at the same speed until the two push plates reach a preset centering position and stop; S4: Set the clamping torque when the push plate clamps the wheel. All push plates on both sides of the vehicle run at the same speed. When the torque fed back by each push plate reaches the clamping torque, the push plate stops until all push plates reach the clamping torque.

2. A light truck centering method according to claim 1, characterized in that: Before step S2, if the front and rear wheel tracks of the vehicle are different, the two push plates corresponding to the wheels with smaller wheel tracks each move a distance equal to half of the wheel track difference, where the wheel track is the distance between the outer sides of the outermost wheels of the front or rear wheels of the vehicle.

3. A light truck centering method according to claim 2, characterized in that: Before the push plate reaches the preset position, the torque limit of the push plate is constant.

4. A light truck centering method according to claim 3, characterized in that: The running speed of the push plate in step S4 is lower than the running speed of the push plate before step S4.

5. A light truck centering method according to claim 1, characterized in that: The distance between the preset centering position and the standard centering position is less than 20 mm.

6. A light truck centering method according to claim 1, characterized in that: The error range of the standard centering position is set. After step S4, it is necessary to detect whether the positions of all push plates are within the error range of the standard centering position.

7. A light truck centering method according to claim 1, characterized in that: The vehicle battery exchange platform is provided with a position monitoring sensor, and after the vehicle is centered, the position monitoring sensor monitors the vehicle status in real time; a movement error is set, and when the vehicle movement trajectory exceeds the movement error, the position monitoring sensor provides feedback.

8. A light truck centering method according to claim 2, characterized in that: The centering mechanism comprises a V-shaped centering roller, and a group of wheels away from the center of gravity of the vehicle enters the V-shaped centering roller.

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