Passenger car towing device performance evaluation method

Abstract

The application discloses a passenger car towing device performance evaluation method, and belongs to the technical field of trailer testing, which comprises test site, climate condition, method load and other aspects of requirements. According to the method, the test can expose the problems of deformation or even damage of the towing device of a certain vehicle model under special working conditions and secondary damage to other parts of the vehicle, so as to avoid the problems flowing into the market. Through the collection of user market complaint cases, simulation of accident vehicle towing site, multi-vehicle model benchmarking verification, a relatively comprehensive verification test working condition is formulated, including towing start impact test, deceleration belt towing test, fixed circle towing test, slope towing test, curbstone escape test and roadbed slope escape test. Through the method, the towing device of a newly launched vehicle model can be comprehensively examined, and the safety performance of the product is improved.

Description

Technical Field

[0001] This invention belongs to the field of trailer testing technology, specifically a method for evaluating the performance of a passenger vehicle traction device. Background Technology

[0002] In the automotive aftermarket, users frequently report issues with tow hook damage when towing vehicles in specific scenarios. Verifying traction strength solely through bench static tensile tests has many shortcomings, such as failing to cover the instantaneous damage to the towing device caused by dynamic impacts and failing to verify the damage to vehicle exterior parts during actual towing.

[0003] Currently, the patent system only provides design methods for traction device structures, but lacks methods for evaluating the actual performance of these designs. For products launched on the market, innovative designs must undergo rigorous verification; otherwise, they are prone to complaints, after-sales maintenance issues, and even safety accidents. Summary of the Invention

[0004] To address the above issues, this invention provides a performance evaluation method for passenger vehicle traction devices, including requirements for test sites, climate conditions, and method loads. Testing according to this method can expose problems such as traction device deformation or even damage under specific operating conditions, as well as secondary damage to other vehicle components, preventing these issues from entering the market. By collecting user complaints, simulating accident vehicle towing scenarios, and benchmarking against multiple vehicle models, a comprehensive set of verification test conditions has been established, including traction start-up impact tests, speed bump traction tests, constant circle traction tests, slope traction tests, curb escape tests, and roadbed slope escape tests. This patented method enables a comprehensive evaluation of the traction devices of newly launched vehicle models, improving product safety performance.

[0005] The technical solution of this invention is as follows: a method for evaluating the performance of a passenger vehicle traction device, comprising the following steps:

[0006] S1: Park the vehicle to be towed on a level surface, connect the rear towing device of the towing vehicle to the front towing device of the vehicle to be towed via a tow rope or tow bar, put the vehicle to be towed in neutral (N) and release the parking brake.

[0007] S2: Conduct starting impact test, speed bump traction test, fixed circle traction test, slope traction test, curbstone escape test and roadbed slope escape test on the towed vehicle;

[0008] S3: Evaluate the trailer boom or trailer rope after the test.

[0009] Furthermore, the starting impact test is as follows: the towing vehicle stops in the same direction directly in front of the towed vehicle, and before the towing rope is taut, it accelerates to 15 km / h until the towed vehicle travels at the same speed, and repeats this three times.

[0010] Furthermore, the speed bump traction test is as follows: the towing vehicle stops in the same direction directly in front of the towed vehicle, and after the towing rope is taut, it accelerates to 30 km / h, passes through a speed bump with a cross-sectional width greater than 300 mm and a height greater than 50 mm, and then stops. This process is repeated three times.

[0011] Furthermore, the fixed-circle traction test is as follows: the tractor pulls the towed vehicle along a circle with a radius of 15m in a circular square, accelerates to 30km / h, maintains it for 10s, and then coasts to a stop; the test is performed three times in the clockwise direction and three times in the counterclockwise direction.

[0012] Furthermore, the slope traction test is conducted as follows: the tractor pulls the towed vehicle up a slope with an incline of 20% and a speed of ≤10km / h. The test ends when the tractor reaches the top of the slope.

[0013] Furthermore, the curbstone traction test is conducted as follows: after placing simulated curbstones in at least two wheel travel directions, the tractor drags the towed vehicle until all wheels of the vehicle with the simulated curbstones placed on them have passed over the simulated curbstones.

[0014] Furthermore, the simulated curbstone has dimensions of 600mm × 150mm × 200mm.

[0015] Furthermore, the roadbed slope traction test is conducted as follows: the towed vehicle is placed on a slope with an angle of 30° to 45° and a slope width of ≥1.5m, and the towed vehicle is dragged until it is pulled onto the road surface.

[0016] Furthermore, in step S3, the evaluation is as follows: the traction device cover, the traction device, and the surrounding components of the traction device are all free from detachment, damage, deformation, loosening, and cracks.

[0017] Furthermore, the length of the trailer rope is ≥5m; the length of the trailer pole is ≥1.5m.

[0018] The beneficial effects of this invention are as follows:

[0019] This invention provides a method for evaluating the performance of a passenger vehicle's traction device, including requirements for test site, climate conditions, and method load. Conducting tests according to this method can expose problems such as deformation or even damage to the traction device of a certain vehicle model under special working conditions, as well as secondary damage to other vehicle components, thus preventing these problems from entering the market. Attached Figure Description

[0020] Figure 1 This is a flowchart of the present invention.

[0021] Figure 2 This is a schematic diagram of the curbstone towing vehicle of the present invention.

[0022] Figure 3 This is a schematic diagram of the roadbed slope of the present invention being parked by a towing vehicle.

[0023] In the picture:

[0024] 1-The towed vehicle; 2-Simulated curb; 3-Roadbed slope. Detailed Implementation

[0025] It should be noted that in the description of this invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; a connection can be a mechanical connection or an electrical connection; a link can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] This invention applies to all passenger vehicles equipped with traction devices.

[0028] Preliminary preparations:

[0029] One tow rope, with a length of not less than 5m; one tow bar, with a length of not less than 1.5m; and two simulated curb stones, each measuring 600mm×150mm×200mm.

[0030] Conditions: The experiment should be conducted in rainless and snowless weather.

[0031] Load: The test load is full load.

[0032] Vehicles: Two test vehicles of the same model, one of which is a tractor and the other is a towed vehicle.

[0033] The traction device, tow rope, and tow bar were installed on the test vehicle, and the evaluation was carried out according to Table 1.

[0034] Table 1 Evaluation Content

[0035] Serial Number Evaluation content 1 Are the traction device and its cover easily observable? 2 Is it easy to open the traction device cover? 3 Is the installation and removal of the traction device simple and smooth, and is there enough space? 4 After installation, are the tow rope and tow bar prone to coming off or becoming misaligned? 5 Are there any situations during the operation that could easily cause injury?

[0036] Traction start impact test

[0037] a) Park the vehicle on a level surface, connect the rear towing device of the tractor to the front towing device of the towed vehicle with a tow rope, put the towed vehicle in neutral (N) gear, and release the parking brake.

[0038] b) The towing vehicle stops in the same direction directly in front of the towed vehicle, starts accelerating, and accelerates to 15 km / h and maintains it before the towing rope is taut, until the towed vehicle is traveling at the same speed.

[0039] c) Repeat step b) 3 times.

[0040] Speed ​​bump traction test

[0041] a) Park the vehicle on a level surface, connect the rear towing device of the tractor to the front towing device of the towed vehicle with a tow rope, put the towed vehicle in neutral (N) gear, and release the parking brake.

[0042] b) The towing vehicle stops in the same direction directly in front of the towed vehicle, starts slowly, and accelerates to 30km / h after the towing rope is straightened. Maintaining a speed of 30km / h, it passes through a speed bump with a cross-sectional width greater than 300mm and a height greater than 50mm and then stops. Repeat this process three times.

[0043] Fixed circle traction test

[0044] a) Park the vehicle on a level surface, connect the rear towing device of the tractor to the front towing device of the towed vehicle with a tow rope, put the towed vehicle in neutral (N) gear, and release the parking brake.

[0045] b) The towing vehicle slowly accelerates to 30 km / h along a 15m radius circle in the circular plaza, maintains this speed for 10 seconds, and then coasts to a stop. This process is repeated three times clockwise and three times counterclockwise.

[0046] c) After replacing the tow rope with a tow bar, repeat steps a) and b).

[0047] Slope Traction Test

[0048] a) Park the vehicle on a level surface, connect the rear towing device of the tractor to the front towing device of the towed vehicle with a tow rope, put the towed vehicle in neutral (N) gear, and release the parking brake.

[0049] b) The tractor pulls the towed vehicle up a slope with an incline of 20% and a speed not exceeding 10 km / h. The test ends when the tractor reaches the top of the slope.

[0050] c) After replacing the tow rope with a tow bar, repeat steps a) and b).

[0051] Curbstone traction test

[0052] a) The towed vehicle and the simulated curb are arranged according to Figure 1 As shown, place the vehicle on the water surface, connect the front towing device of the tractor to the rear towing device of the towed vehicle with a tow rope, put the towed vehicle in neutral (N) gear, and release the parking brake.

[0053] b) The tractor slowly tows the towed vehicle until both the left and right front wheels of the towed vehicle have passed the simulated curb.

[0054] Roadbed slope escape test

[0055] a) Locate a suitable roadbed slope with a gradient ranging from 30° to 45° and a slope width of no less than 1.5m. The towed vehicle should be positioned according to... Figure 2 As shown in the diagram, connect the rear towing device of the tractor to the front towing device of the towed vehicle using a tow rope, with the towed vehicle in neutral (N) and the parking brake released.

[0056] b) The towing vehicle slowly drags the towed vehicle until it is on the road surface.

[0057] Evaluation criteria

[0058] 1. The traction device cover should not be detached, damaged, or otherwise malfunctioning.

[0059] 2. The traction device and related components should not exhibit deformation, loosening, cracks, or other malfunctions.

[0060] 3. The components around the traction device should not be deformed, damaged, or otherwise malfunctioning.

[0061] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be included within the scope of protection of the present invention. Furthermore, all content not described in detail in this specification is prior art known to those skilled in the art.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A method for evaluating the performance of a passenger vehicle's traction device, characterized in that, Includes the following steps: S1: Park the vehicle to be towed on a level surface, connect the rear towing device of the towing vehicle to the front towing device of the vehicle to be towed via a tow rope or tow bar, put the vehicle to be towed in neutral (N) and release the parking brake. S2: Conduct starting impact test, speed bump traction test, fixed circle traction test, slope traction test, curbstone escape test and roadbed slope escape test on the towed vehicle; S3: Evaluate the traction device after the test; In step S2, the starting impact test is as follows: the tractor vehicle stops in the same direction directly in front of the towed vehicle, accelerates to 15 km / h before the tow rope is taut, and continues until the towed vehicle travels at the same speed. This is repeated three times. In step S2, the speed bump traction test is as follows: the tractor vehicle stops in the same direction directly in front of the towed vehicle, accelerates to 30 km / h after the tow rope is taut, passes over a speed bump with a cross-sectional width greater than 300 mm and a height greater than 50 mm, and then stops. This is repeated three times. In step S2, the circular traction test is as follows: the tractor vehicle tows the towed vehicle along a circular plaza with a radius of 15 m, accelerates to 30 km / h, maintains this speed for 10 seconds, and then coasts to a stop. This is repeated three times clockwise and three times counterclockwise. In step S2, the slope traction test is as follows: the tractor vehicle tows the towed vehicle up a slope with an incline of 20% and a speed ≤10 km / h. The test ends when the tractor reaches the top of the slope at a speed of m / h. In step S2, the curbstone detachment test is as follows: after placing simulated curbstones in at least two wheel travel directions, the tractor drags the towed vehicle until all wheels of the placed simulated curbstones have passed over them. In step S2, the simulated curbstones are 600mm × 150mm × 200mm in size. In step S2, the roadbed slope detachment test is as follows: the towed vehicle is placed on a slope with an angle of 30° to 45° and a slope width of ≥1.5m. The tractor drags the towed vehicle until it is pulled onto the road surface. In step S3, the evaluation is as follows: the towing device cover, the towing device, and the surrounding components of the towing device are all free from detachment, damage, deformation, loosening, and cracks. In step S2, the towing rope length is ≥5m and the towing bar length is ≥1.5m.

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