Hydraulic drive type four-wheel-drive vehicle emission inspection bench

Abstract

The invention discloses a hydraulic drive type four-wheel-drive vehicle emission inspection bench, which is arranged in a pit, and comprises a fixed chassis dynamometer, front wheels of a four-wheel-drive vehicle are arranged on the fixed chassis dynamometer, and the fixed chassis dynamometer is used for simulating the speed and load of the vehicle actually running on a road; the movable chassis dynamometer is arranged in parallel relative to the fixed chassis dynamometer, and the rear wheels of the four-wheel drive vehicle are arranged on the movable chassis dynamometer and used for simulating the speed and load of the vehicle actually running on the road; a driving execution part of the linear moving assembly is connected with the movable chassis dynamometer, and the movable chassis dynamometer is moved to adjust the distance between the movable chassis dynamometer and the fixed chassis dynamometer; the two chassis dynamometers are arranged to apply loads to the front wheels and the rear wheels of the four-wheel-drive vehicle respectively, so that emission of the four-wheel-drive vehicle using the device can be detected by adopting a simple working condition method, and the accuracy of emission result detection of the four-wheel-drive vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle detection, in particular to a hydraulically driven four-wheel drive vehicle emission inspection platform. Background Art

[0002] The simple operating condition emission testing equipment used by existing motor vehicle emission testing agencies is not suitable for emission testing of four-wheel drive vehicles. This is because under this method, the front and rear wheel speeds of the four-wheel drive vehicle are inconsistent, which will cause the vehicle to enter the four-wheel drive state, causing the vehicle to move, interfering with the test results, and possibly damaging the vehicle. Therefore, four-wheel drive vehicles usually need to use the dual idle operating condition method for exhaust gas testing.

[0003] Due to the significant differences between the simple operating condition method and the dual idle method in many aspects such as test methods and testing equipment, the emission test results obtained by the two have large errors and cannot be used for unified quantitative calculations, resulting in the inability to effectively control the pollution emissions of four-wheel drive vehicles. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulically driven four-wheel drive vehicle emission test bench, which is equipped with two sets of chassis dynamometers to apply loads to the front and rear wheels of the four-wheel drive vehicle respectively, so as to solve the technical problems existing in the prior art.

[0005] To solve the above technical problems, the present invention specifically provides the following technical solutions: a hydraulically driven four-wheel drive vehicle emission test bench, arranged in a pit, comprising:

[0006] A fixed chassis dynamometer is fixedly arranged in the pit, and the front wheels of the four-wheel drive vehicle are placed on the fixed chassis dynamometer to simulate the actual speed and load of the vehicle traveling on the road; a mobile chassis dynamometer is movably arranged in the pit and arranged parallel to the fixed chassis dynamometer, and the rear wheels of the four-wheel drive vehicle are placed on the mobile chassis dynamometer to simulate the actual speed and load of the vehicle traveling on the road; a linear moving component is arranged in the pit, and the driving actuator of the linear moving component is connected to the mobile chassis dynamometer, and the mobile chassis dynamometer is moved to adjust the distance between the mobile chassis dynamometer and the fixed chassis dynamometer; a limit component is arranged in the pit, and the limit component can impose restrictions on the mobile chassis dynamometer after the mobile chassis dynamometer moves to fix the mobile chassis dynamometer.

[0007] Furthermore, it also includes a pit frame and a first support plate arranged on the surface of the pit frame, the pit frame is arranged in the pit, and the first support plate and the ground around the pit are at the same horizontal plane; the first support plate is provided with a first through hole and a second through hole at positions corresponding to the fixed chassis dynamometer and the mobile chassis dynamometer, respectively, so that the front wheels and rear wheels of the four-wheel drive vehicle can contact the fixed chassis dynamometer and the mobile chassis dynamometer respectively; and the size of the second through hole is set to: have space for the mobile chassis dynamometer to move.

[0008] Furthermore, the mobile chassis dynamometer is arranged in a carrying frame, and the driving actuator of the linear moving assembly is connected to the carrying frame; the size of the second through hole is set to: have space for the carrying frame to move; the surface of the carrying frame is covered with a second support plate, and the second support plate is provided with a third through hole that allows the rear wheels of the four-wheel drive vehicle to contact the mobile chassis dynamometer; the size of the second support plate is set to: when the mobile chassis dynamometer moves to the maximum distance and minimum distance between itself and the fixed chassis dynamometer, the second support plate can cover the second through hole; the second support plate is located above the first support plate, and the two are in contact.

[0009] Furthermore, at least two sets of tracks are laid on the bottom surface of the pit along the moving direction of the mobile chassis dynamometer, and the bottom of the supporting frame is provided with rollers that can roll along the tracks, and at least two of the rollers are correspondingly provided for each set of tracks.

[0010] Furthermore, the linear moving component is an electric hydraulic rod, which is horizontally arranged along the moving direction of the mobile chassis dynamometer, and the two ends of the electric hydraulic rod are respectively connected to the fixed chassis dynamometer and the supporting frame.

[0011] Furthermore, an operating platform is provided on the surface of the first support plate, and the operating platform is communicatively connected to the electro-hydraulic support rod to adjust the telescopic distance of the electro-hydraulic support rod.

[0012] Furthermore, the limiting assembly includes two symmetrically arranged groups of slide grooves, and pulleys are respectively arranged in the slide grooves; the two groups of slide grooves are respectively symmetrically arranged on both sides of the length direction of the pit frame, and the slide grooves are located within the moving stroke range of the mobile chassis dynamometer, and the pulleys are symmetrically arranged on both sides of the mobile chassis dynamometer; the slide grooves are concave grooves, and the pulleys are stuck in the slide grooves.

[0013] Furthermore, the bottom of the chute is a rack structure, and the outer ring of the pulley is a gear ring structure that can engage with the rack structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The hydraulically driven four-wheel drive vehicle emission test bench provided by the present invention is equipped with two sets of chassis dynamometers, which respectively apply loads to the front and rear wheels of the four-wheel drive vehicle. After using this device, the four-wheel drive vehicle can use a simple working condition method to test emissions, thereby improving the accuracy of the emission test results of the four-wheel drive vehicle.

[0016] At the same time, by selecting and activating one of the chassis dynamometers for testing two-wheel drive vehicles, the device can meet the emission testing requirements of all vehicles under the simple working condition method, thus solving the problem of accuracy in measuring regional emission pollution under the condition of consistent measurement methods.

[0017] There are two sets of chassis dynamometers, one set is fixed and the other is mobile. One of the sets of chassis dynamometers can be used to test four-wheel drive vehicles with different wheelbases. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0019] Figure 1 This is a structural schematic diagram of a hydraulically driven four-wheel drive vehicle emission test bench according to the present invention;

[0020] Figure 2 This is a structural diagram of a mobile chassis dynamometer;

[0021] Figure 3 It is a cross-sectional view of the interior of the inspection station;

[0022] Figure 4 It is a structural diagram of the pulley and chute.

[0023] The numbers in the figure represent the following:

[0024] 1-Fixed chassis dynamometer, 2-Mobile chassis dynamometer, 3-First support plate, 4-Second support plate, 5-Operating table, 6-Pit frame, 7-Loading frame, 8-Roller, 9-Track, 10-Electric hydraulic rod, 11-Slide, 12-Pulley, 13-Rack structure, 14-Gear ring structure, 15-First through hole, 16-Second through hole, 17-Third through hole. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1 and Figure 2 As shown, the present invention provides an implementation of a hydraulically driven four-wheel drive vehicle emission inspection bench. The device is arranged in a pit and specifically includes the following structure.

[0027] The fixed chassis dynamometer 1 is fixedly installed in the pit. During the test, the front wheels of the four-wheel drive vehicle are placed on the fixed chassis dynamometer 1 to simulate the actual speed and load of the vehicle on the road.

[0028] The fixed chassis dynamometer 1 is a common chassis dynamometer device in the prior art.

[0029] The mobile chassis dynamometer 2 is movably arranged in the pit and is arranged parallel to the fixed chassis dynamometer 1. During the inspection, the rear wheels of the four-wheel drive vehicle are placed on the mobile chassis dynamometer 2 to simulate the actual speed and load of the vehicle on the road.

[0030] The mobile chassis dynamometer 2 is a common chassis dynamometer device in the prior art.

[0031] The linear moving component is arranged in the pit. The driving actuator of the linear moving component is connected to the mobile chassis dynamometer 2. The mobile chassis dynamometer 2 is moved to adjust the distance between the mobile chassis dynamometer 2 and the fixed chassis dynamometer 1, which can adapt to the detection needs of four-wheel drive vehicles with different wheelbases.

[0032] The limiting assembly is arranged in the pit. The driving actuator of the limiting assembly can impose restrictions on the mobile chassis dynamometer 2 after the mobile chassis dynamometer 2 moves to fix the mobile chassis dynamometer 2 so that the mobile chassis dynamometer 2 maintains stability during the test to avoid shaking of the mobile chassis dynamometer 2 relative to the rear wheels of the four-wheel drive vehicle.

[0033] If the mobile chassis dynamometer 2 vibrates, the roller axes of the mobile chassis dynamometer 2 and the fixed chassis dynamometer 1 may not be parallel, aggravating the lateral friction between the tire and the roller, affecting the rotational speed consistency, and causing distortion of the test data.

[0034] In order to enable the four-wheel drive vehicle to travel and park on the inspection bench, this embodiment also provides an example of the inspection bench.

[0035] like Figure 1 and Figure 3 As shown, it includes a pit frame 6 and a first support plate 3 arranged on the surface of the pit frame 6.

[0036] The pit frame 6 is arranged in the pit, and the first support plate 3 is at the same horizontal plane as the ground around the pit. The first support plate 3 is provided with a first through hole 15 and a second through hole 16 at positions corresponding to the fixed chassis dynamometer 1 and the mobile chassis dynamometer 2, respectively, so that the front wheels and rear wheels of the four-wheel drive vehicle can contact the fixed chassis dynamometer 1 and the mobile chassis dynamometer 2, respectively.

[0037] The size of the second through hole 16 is set to have space for the mobile chassis dynamometer 2 to move.

[0038] The first support plate 3 is made of 5 mm thick threaded steel plate to increase the tension and load-bearing capacity of the steel plate, thereby preventing deformation and slipping caused by the vehicle running on the steel plate.

[0039] Specifically, the mobile chassis dynamometer 2 is disposed in the carrying frame 7 , and the driving actuator of the linear motion assembly is connected to the carrying frame 7 ; therefore, the size of the second through hole 16 is set to have space for the carrying frame 7 to move.

[0040] The surface of the supporting frame 7 is covered with a second support plate 4, which has a third through hole 17 that allows the rear wheels of the four-wheel drive vehicle to contact the mobile chassis dynamometer 2. The second support plate 4 is located above the first support plate 3, and the two are in contact.

[0041] The size of the second support plate 4 is set to be such that when the mobile chassis dynamometer 2 moves to the maximum distance and the minimum distance between the mobile chassis dynamometer 2 and the fixed chassis dynamometer 1 , the second support plate 4 can cover the second through hole 16 .

[0042] The second support plate 4 is made of 5 mm thick threaded steel plate to increase the tension and load-bearing capacity of the steel plate, thereby preventing deformation and slipping caused by the vehicle running on the steel plate.

[0043] In order to facilitate the movement of the mobile chassis dynamometer 2 , this embodiment provides the following examples.

[0044] like Figure 2 and Figure 3 As shown, at least two sets of tracks 9 are laid on the bottom of the pit along the moving direction of the mobile chassis dynamometer 2, and rollers 8 that can roll along the tracks 9 are provided at the bottom of the supporting frame 7, and at least two rollers 8 are correspondingly provided for each set of tracks 9.

[0045] The track 9 is an I-shaped track 9 , and the material is steel; the roller 8 is a double-sided structure, so that the roller 8 can be stuck on the track 9 .

[0046] This embodiment provides the following examples for the linear motion component.

[0047] The linear moving component is an electric hydraulic rod 10 , which is horizontally arranged along the moving direction of the mobile chassis dynamometer 2 , and the two ends of the electric hydraulic rod 10 are respectively connected to the fixed chassis dynamometer 1 and the carrying frame 7 .

[0048] The electric hydraulic support adopts a reciprocating electric cylinder with a thrust of 1 ton and a stroke of 1.1 meters. It can achieve high-precision control with an accuracy of 0.02mm, meeting the requirements of vehicle inspection with a wheelbase of 2300-3400mm.

[0049] Furthermore, an operating platform 5 is provided on the surface of the first support plate 3 , and the operating platform 5 is communicatively connected to the electro-hydraulic support rod to adjust the telescopic distance of the electro-hydraulic support rod.

[0050] Based on the manually measured axle spacing between the front and rear wheels of the vehicle, the operator sets the required movement distance and direction on the display screen. Pressing the "Start" button controls the extension and retraction distance of the electro-hydraulic struts, driving the load-bearing frame 7 to move, thereby enabling the front and rear wheels of the four-wheel drive vehicle to stop and rotate simultaneously on the fixed chassis dynamometer 1 and the mobile chassis dynamometer 2.

[0051] The operating console 5 also has a power switch button, a "stop" button and an "emergency" button to ensure safe use of the equipment.

[0052] This embodiment provides the following examples for the limiting component.

[0053] like Figure 3 and Figure 4 As shown, the limiting assembly includes two symmetrically arranged groups of slide grooves 11, and pulleys 12 are respectively arranged in the slide grooves 11; the two groups of slide grooves 11 are respectively symmetrically arranged on both sides of the length direction of the pit frame 6, and the slide grooves 11 are located within the moving stroke range of the mobile chassis dynamometer 2, and the pulleys 12 are symmetrically arranged on both sides of the mobile chassis dynamometer 2; the slide grooves 11 are concave grooves, and the pulleys 12 are stuck in the slide grooves 11.

[0054] The position of the pulley 12 is limited by the slide groove 11 so that the roller axes of the mobile chassis dynamometer 2 and the fixed chassis dynamometer 1 are kept parallel to each other, thereby preventing the roller axis of the mobile chassis dynamometer 2 from deflecting.

[0055] At the same time, the clamping structure between the roller 8 and the track 9 further enhances the limiting effect on the mobile chassis dynamometer 2 .

[0056] Furthermore, the bottom of the slide 11 is a rack structure 13, and the outer ring of the pulley 12 is a gear ring structure 14 that can engage with the rack structure 13. Through the engagement structure of the two, the movement accuracy of the pulley 12 relative to the slide 11 can be controlled, and when the electric hydraulic rod 10 stops extending and retracting, the structures that engage the electric hydraulic rod 10 and the gear ring and rack cooperate with each other to limit the movement of the mobile chassis dynamometer 2 along the extension and retraction direction of the electric hydraulic rod 10, thereby fixing the mobile chassis dynamometer 2.

[0057] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A hydraulically driven four-wheel drive vehicle emission test bench, arranged in a pit, characterized in that: include: A fixed chassis dynamometer (1) is fixedly arranged in the pit, and the front wheels of the four-wheel drive vehicle are placed on the fixed chassis dynamometer (1) to simulate the actual speed and load of the vehicle on the road; A mobile chassis dynamometer (2) is movably arranged in the pit and arranged in parallel with the fixed chassis dynamometer (1). The rear wheels of the four-wheel drive vehicle are placed on the mobile chassis dynamometer (2) to simulate the actual speed and load of the vehicle when traveling on the road. A linear moving assembly is arranged in the pit, wherein a driving actuator of the linear moving assembly is connected to the mobile chassis dynamometer (2) and moves the mobile chassis dynamometer (2) to adjust the distance between the mobile chassis dynamometer (2) and the fixed chassis dynamometer (1); A limiting component is arranged in the pit, and the limiting component can impose a limit on the mobile chassis dynamometer (2) after the mobile chassis dynamometer (2) moves, so as to fix the mobile chassis dynamometer (2).

2. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 1, characterized in that: It also includes a pit frame (6) and a first support plate (3) arranged on the surface of the pit frame (6), the pit frame (6) is arranged in the pit, and the first support plate (3) is at the same level as the ground around the pit; A first through hole (15) and a second through hole (16) are respectively formed on the first support plate (3) at positions corresponding to the fixed chassis dynamometer (1) and the mobile chassis dynamometer (2), so that the front wheels and rear wheels of the four-wheel drive vehicle can respectively contact the fixed chassis dynamometer (1) and the mobile chassis dynamometer (2); The size of the second through hole (16) is set to have space for the mobile chassis dynamometer (2) to move.

3. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 2, characterized in that: The mobile chassis dynamometer (2) is arranged in a carrying frame (7), and the driving actuator of the linear motion assembly is connected to the carrying frame (7); The size of the second through hole (16) is set to have space for the carrying frame (7) to move; The surface of the load-bearing frame (7) is covered with a second support plate (4), and the second support plate (4) is provided with a third through hole (17) that enables the rear wheel of the four-wheel drive vehicle to contact the mobile chassis dynamometer (2); The size of the second support plate (4) is set so that when the mobile chassis dynamometer (2) moves to the maximum distance and the minimum distance between the mobile chassis dynamometer (2) and the fixed chassis dynamometer (1), the second support plate (4) can cover the second through hole (16); The second support plate (4) is located above the first support plate (3), and the two are in contact with each other.

4. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 3, characterized in that: At least two groups of tracks (9) are laid on the bottom surface of the pit along the moving direction of the mobile chassis dynamometer (2); rollers (8) capable of rolling along the tracks (9) are provided at the bottom of the supporting frame (7); and at least two rollers (8) are correspondingly provided for each group of tracks (9).

5. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 1, characterized in that: The linear moving component is an electric hydraulic rod (10), which is horizontally arranged along the moving direction of the mobile chassis dynamometer (2), and the two ends of the electric hydraulic rod (10) are respectively connected to the fixed chassis dynamometer (1) and the supporting frame (7).

6. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 5, characterized in that: An operating platform (5) is provided on the surface of the first support plate (3), and the operating platform (5) is communicatively connected to the electro-hydraulic support rod to adjust the telescopic distance of the electro-hydraulic support rod.

7. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 1, characterized in that: The limiting assembly comprises two sets of symmetrically arranged sliding grooves (11), and pulleys (12) respectively arranged in the sliding grooves (11); The two groups of chutes (11) are symmetrically arranged on both sides of the length direction of the pit frame (6), and the chutes (11) are located within the moving range of the mobile chassis dynamometer (2), and the pulleys (12) are symmetrically arranged on both sides of the mobile chassis dynamometer (2); The sliding groove (11) is a concave groove, and the pulley (12) is clamped in the sliding groove (11).

8. The hydraulically driven four-wheel drive vehicle emission test bench according to claim 7, characterized in that: The bottom of the chute (11) is a rack structure (13), and the outer ring of the pulley (12) is a gear ring structure (14) capable of meshing with the rack structure (13).

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