A high-efficiency water-cooling system for high-temperature vibration testing of electric vehicle batteries

Abstract

This invention discloses a high-efficiency water-cooling system for high-temperature vibration testing of electric vehicle batteries. It includes a support body with a heating chamber fixed at the center of its upper surface. A loading unit is installed inside the heating chamber, suspended directly above a carrier plate, and a horizontally positioned water-cooling plate is mounted on the lower surface of the loading unit. Multiple cooling channels are parallel to each other within the water-cooling plate, and multiple cooling units are evenly distributed within each cooling channel. In this invention, the water-cooling plate maintains constant contact with the vehicle battery. Multiple cooling channels are connected in parallel within the water-cooling plate, each capable of delivering coolant. Each cooling channel contains multiple flow chambers, the size of which can be adjusted by the deformation of a baffle plate, thereby regulating the coolant flow rate in each cooling channel. This allows the water-cooling plate to rapidly cool and dissipate heat from high-heat areas.

Description

Technical Field

[0001] This invention belongs to the field of vibration testing technology, specifically a high-efficiency heat dissipation water cooling system for high-temperature vibration testing of electric vehicle batteries. Background Technology

[0002] Electric vehicle batteries are currently tested for thermal stability and durability in experiments to verify the risk of thermal runaway, lifespan degradation, fatigue, or damage at high temperatures. Traditional high-temperature vibration tests typically use heating chambers to conduct high-temperature tests on the battery, while an additional water-cooling system needs to rapidly cool the battery under specified conditions to prevent test runaway. However, most water-cooling systems use fixed flow channel designs (such as serpentine or parallel straight channels), resulting in excessively uniform coolant flow distribution within or between channels. This makes it difficult to quickly cool high-heat areas of the battery, and the static flow channels cannot dynamically adjust the cooling intensity of local areas according to real-time temperature changes on the battery surface. High-heat areas do not receive additional coolant flow, leading to heat accumulation and a continuous rise in temperature, creating a safety hazard. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency heat dissipation water cooling system for high-temperature vibration testing of electric vehicle batteries, comprising a support body, a heating box fixed at the center of its upper end face, a vibration table provided on the lower end face of the heating box, and a carrier plate provided inside the heating box;

[0004] The heating box is equipped with a loading unit, which is suspended above the carrier plate. A horizontally arranged water-cooled plate is installed on the lower end of the loading unit. A circulating pump is installed outside the heating box. The inlet and outlet of the circulating pump are connected to the water-cooled plate through liquid guide pipes.

[0005] The water-cooled plate has multiple cooling channels arranged in parallel inside, and multiple cooling units are evenly distributed in each cooling channel.

[0006] Furthermore, as a preferred embodiment, a transfer fixture is vertically and slidably connected through the middle of the heating box. The upper end face of the transfer fixture is fixed to the carrier plate, and its lower end face is connected to the vibration output end of the vibration table.

[0007] Furthermore, as a preferred embodiment, the loading unit includes two side transfer frames arranged symmetrically on the left and right sides. Each side transfer frame is vertically fixed inside the heating box. A horizontally arranged beam is vertically slidably connected between the two side transfer frames. Multiple loading rods are vertically fixed on the lower end face of the beam, and a fixing plate is arranged parallel to the lower end face of the beam. The lower end of each loading rod is connected to the fixing plate.

[0008] A connecting plate is horizontally arranged between the fixing plate and the beam frame, and a shock-absorbing spring is vertically connected to the fixing plate;

[0009] A shaft column is vertically fixed to the middle of the lower end face of the fixing plate, and the lower end of the shaft column is fixed to the water-cooling plate.

[0010] Furthermore, as a preferred embodiment, a loading cylinder is vertically mounted on the side transfer frame, and the output end of the loading cylinder is connected to the beam frame.

[0011] Furthermore, as a preferred embodiment, the water-cooled plate is symmetrically provided with flow cavities that vertically connect each of the cooling channels, and liquid inlets and liquid outlets are respectively provided outside the two flow cavities;

[0012] The cooling channel has multiple flow guide cavities distributed in it, and each flow guide cavity is arranged in a corresponding manner to a cooling unit. The flow guide cavity is constructed into a circular structure, and the inner wall of the flow guide cavity is symmetrically connected with a baffle plate. An air bladder is arranged between the baffle plate and the flow guide cavity.

[0013] Furthermore, as a preferred embodiment, the cross-section of the baffle plate is arc-shaped, and multiple airflow pipes are pre-embedded in the water-cooled plate, with each airflow pipe connected to two airbags in the guide cavity.

[0014] Furthermore, as a preferred embodiment, the cooling unit includes a heat-conducting column, which is vertically fixed in a water-cooling plate. A heat-conducting plate is coaxially fixed to the lower end face of the heat-conducting column. A positioning groove is provided in the water-cooling plate at each heat-conducting column. A threaded cooling pipe coaxially sleeved with the heat-conducting column is provided in the positioning groove. A central channel is vertically provided in the middle of the heat-conducting column.

[0015] The water-cooled plate has multiple internal flow channels that are perpendicular to the cooling channel. The internal flow channels are located on one side of the heat-conducting column, and the water-cooled plate has an exhaust channel on the other side of the heat-conducting column.

[0016] Furthermore, as a preferred embodiment, the inner flow channels located on both sides of the heat-conducting column are connected to the corresponding drainage channels, and the circulating pump device is connected to each inner flow channel through a circulation pipe.

[0017] Furthermore, as a preferred embodiment, a sealing cavity is provided above the interior of the heat-conducting column, an adjusting tube is slidably connected inside the sealing cavity, a side hole is provided on the side wall of the adjusting tube, the liquid inlet end of the threaded cooling tube is connected to one side of the sealing cavity, and its liquid outlet end is connected to the drain channel through a bypass channel.

[0018] A valve shaft is fixed inside the heat-conducting column, and the valve shaft is in sliding engagement with the end of the regulating tube;

[0019] The heat-conducting column has an annular overflow chamber, which is connected to the central channel. An L-shaped channel is provided on one side of the overflow chamber, which is connected to the drain channel.

[0020] Furthermore, as a preferred embodiment, both the bypass channel and the L-shaped channel are configured as unidirectional channels; a connecting rod is vertically slidably connected inside the heat-conducting column, the lower end of the connecting rod is connected to the regulating pipe, and an electromagnetic controller is provided outside the water-cooling plate, one end of the electromagnetic controller being fixed to the connecting rod.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] In this invention, the electric vehicle battery can undergo high-temperature vibration testing within a heating chamber. A water-cooled plate is horizontally positioned within the heating chamber via a loading unit, maintaining constant contact with the battery to provide cooling during the high-temperature vibration test. The water-cooled plate contains multiple cooling channels connected in parallel series, each capable of supplying coolant. Each channel contains multiple flow chambers, the size of which can be adjusted by the deformation of a baffle plate, thereby regulating the coolant flow rate in each channel. This allows the water-cooled plate to rapidly cool high-heat areas. Furthermore, each flow chamber contains a heat-conducting column, each capable of providing varying intensities of heat conduction and cooling at different points, further enhancing rapid heat conduction and cooling of high-heat areas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of the heating box in this invention;

[0025] Figure 3 This is a schematic diagram of the water-cooled plate in this invention;

[0026] Figure 4 This is a schematic diagram of the loading unit in this invention;

[0027] Figure 5 This is a schematic diagram of the flow guiding cavity in this invention;

[0028] Figure 6 This is a schematic cross-sectional view of the water-cooled plate in this invention;

[0029] Figure 7 This is a schematic cross-sectional view of the heat-conducting pillar in this invention;

[0030] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point A in the middle;

[0031] In the diagram: 1. Heating box; 11. Support body; 12. Vibration table; 13. Carrier plate; 14. Adapter fixture; 15. Circulating pump device; 2. Loading unit; 21. Side-shifting frame; 22. Beam frame; 23. Loading rod; 24. Fixing plate; 25. Connecting plate; 26. Shock-absorbing spring; 27. Shaft column; 3. Water-cooled plate; 31. Flow chamber; 32. Liquid inlet; 4. Cooling channel; 41. Guide chamber; 42. Baffle plate; 43. Airbag; 44. Airflow pipe; 5. Cooling unit; 51. Heat-conducting plate; 52. Threaded cooling pipe; 53. Inner flow channel; 54. Drain channel; 6. Heat-conducting column; 61. Central channel; 62. Sealing chamber; 63. Adjusting pipe; 64. Side hole; 65. Valve shaft; 66. Overflow tank; 67. L-shaped channel; 68. Connecting rod. Detailed Implementation

[0032] Please see Figures 1-8 In this embodiment of the invention, a high-efficiency heat dissipation water cooling system for high-temperature vibration testing of electric vehicle batteries includes a support body 11, a heating box 1 fixed at the center of its upper end face, a vibration table 12 provided on the lower end face of the heating box 1, a carrier plate 13 provided inside the heating box 1, and an automobile battery being placed on the carrier plate 13. Multiple limiting grooves can be opened on the surface of the carrier plate 13, and the automobile battery is fixed by being engaged with the limiting grooves by a locking block to avoid the risk of slipping during testing.

[0033] The heating chamber 1 is equipped with a loading unit 2, which is suspended directly above the carrier plate 13. A horizontally arranged water-cooled plate 3 is installed on the lower end face of the loading unit 2. A circulating pump device 15 is installed outside the heating chamber 1. The inlet and outlet of the circulating pump device 15 are connected to the water-cooled plate 3 through liquid guide pipes. The circulating pump device 15 specifically includes a circulating pump, which is mainly used to provide power for the circulation of coolant and overcome the flow resistance of the system. It is also equipped with a liquid storage tank to contain coolant and compensate for volume changes due to thermal expansion and contraction. It can be equipped with a precision filter to effectively intercept particulate impurities in the coolant and prevent blockage inside the water-cooled plate 3. It also includes a temperature controller (e.g., a refrigeration unit) for cooling the return high temperature.

[0034] Multiple cooling channels 4 are parallel to each other in the water-cooled plate 3, and multiple cooling units 5 are evenly distributed in each cooling channel 4. Coolant is circulated in the water-cooled plate 3 to quickly cool down the car battery.

[0035] In this embodiment, a transition fixture 14 is vertically and slidably connected through the middle of the heating box 1. The upper end face of the transition fixture 14 is fixed to the carrier plate 13, and its lower end face is connected to the vibration output end of the vibration table 12.

[0036] In a preferred embodiment, the loading unit 2 includes two side transfer frames 21 arranged symmetrically on the left and right. The side transfer frames 21 are both vertically fixed inside the heating box 1. A horizontally arranged beam frame 22 is vertically slidably connected between the two side transfer frames 21. A plurality of loading rods 23 are vertically fixed on the lower end face of the beam frame 22, and a fixing plate 24 is arranged parallel to the lower end face of the beam frame 22. The lower end of each loading rod 23 is connected to the fixing plate 24.

[0037] A connecting plate 25 is horizontally arranged between the fixing plate 24 and the beam frame 22. A shock-absorbing spring 26 is vertically connected to the fixing plate 24, and the upper end of the shock-absorbing spring 26 is connected to the connecting plate 25.

[0038] A shaft column 27 is vertically fixed at the center of the lower end face of the fixed plate 24. The lower end of the shaft column 27 is fixed to the water-cooled plate 3. When the beam frame 22 slides downward, the water-cooled plate 3 below the shaft column 27 can gradually press down and contact the car battery. At this time, relative sliding occurs between the shaft column 27 and the fixed plate 24, and the shock-absorbing spring 26 is gradually stretched. When the water-cooled plate 3 and the car battery reach the specified pressure, the beam frame 22 maintains a constant position.

[0039] In this embodiment, a loading cylinder (not shown in the figure) is vertically installed on the side transfer frame 21. The output end of the loading cylinder is connected to the beam frame 22 and is used to control the vertical sliding of the beam frame 22.

[0040] In this embodiment, the water-cooled plate 3 is symmetrically provided with flow chambers 31 that are vertically connected to each of the cooling channels 4. The two flow chambers 31 are respectively provided with inlet 32 ​​and outlet. The coolant at the inlet 32 ​​can enter the flow chamber 31 and flow into each of the cooling channels 4 through the flow chamber 31. Then it gathers in the other flow chamber 31 and is discharged from the outlet.

[0041] Multiple flow guide cavities 41 are distributed in the cooling channel 4. Each flow guide cavity 41 is arranged in a corresponding manner to a cooling unit 5. The flow guide cavity 41 is constructed into a circular structure. A flow baffle plate 42 is symmetrically connected to the inner wall of the flow guide cavity 41. An airbag 43 is arranged between the flow baffle plate 42 and the flow guide cavity 41.

[0042] In this embodiment, the flow-blocking plate 42 has an arc-shaped cross-section. Multiple airflow pipes 44 are pre-embedded in the water-cooling plate 3, and each airflow pipe 44 is connected to two airbags 43 in the flow-guiding cavity 41. It should be noted that the flow-blocking plate is made of an elastically deformable alloy material. When the airbags 43 are gradually inflated, they expand and compress the flow-blocking plate 42, causing the flow-blocking plate 42 to deform at the center of the flow-guiding cavity 41. At this time, the flow area within the flow-guiding cavity 41 gradually decreases due to the obstruction of the flow-blocking plate 42, thereby changing the cooling intensity of the flow-guiding cavity 41. The multiple flow-blocking plates 42 in the multiple flow-guiding cavities 41 can work together... The deformation causes a decrease in the coolant flow rate within the guide cavity 41, prompting the coolant to flow into the adjacent cooling channels 4. Furthermore, the guide cavities 41 in each cooling channel 4 can be flexibly adjusted as a whole through the deformation of the baffle plate 42. For example, to dissipate heat from the high-heat area in the center of the car battery and quickly suppress the temperature rise of the hot spot, the guide cavity 41 can be used to change the cooling channel 4 into a gradually narrowing channel type (the flow area of ​​the guide cavity 41 in the same cooling channel 4 gradually decreases to one side), thereby increasing the internal coolant flow rate and forming an accelerating flow to quickly carry away the accumulated heat. Conversely, it can also be changed into a gradually expanding channel type, causing the coolant to form a decelerating flow.

[0043] In a preferred embodiment, the cooling unit 5 includes a heat-conducting column 6, which is vertically fixed in the water-cooling plate 3. A heat-conducting plate 51 is coaxially fixed to the lower end face of the heat-conducting column 6. The heat-conducting plate 51 can fully contact the surface of the car battery to achieve rapid contact heat conduction and cooling. The water-cooling plate 3 has positioning grooves at each heat-conducting column. A threaded cooling pipe 52 coaxially sleeved with the heat-conducting column is provided in the positioning groove. A central channel 61 is vertically opened in the middle of the heat-conducting column 6. The surface of the heat-conducting column has threaded grooves, and the threaded cooling pipe 52 can be installed in the threaded grooves to fully contact the heat-conducting column 6 for heat conduction.

[0044] The water-cooled plate 3 has multiple internal flow channels 53 that are perpendicular to the cooling channel 4. The internal flow channels 53 are located on one side of the heat-conducting column 6, and the water-cooled plate 3 has an exhaust channel 54 located on the other side of the heat-conducting column 6.

[0045] In this embodiment, the inner flow channels 53 and the drain channels 54 located on both sides of the heat-conducting column 6 are connected to each other. The circulating pump device 15 is connected to each inner flow channel 53 through a circulating pipe (not shown in the figure). In other words, the inner flow channels 53 and the drain channels 54 can form a path for the second cooling channel, which can achieve multi-point rapid heat dissipation of the car battery by cooling the heat-conducting column 6.

[0046] In this embodiment, a sealing cavity 62 is provided above the interior of the heat-conducting column 6. An adjusting tube 63 is slidably connected inside the sealing cavity 62. A side hole 64 is provided on the side wall of the adjusting tube 63. The liquid inlet end of the threaded cooling tube 52 is connected to one side of the sealing cavity 62, and its liquid outlet end is connected to the drain channel 54 through the bypass channel 55.

[0047] A valve shaft 65 is fixed inside the heat-conducting column 6, and the valve shaft 65 is slidably engaged with the end of the regulating tube 63;

[0048] An annular overflow chamber 66 is provided inside the heat-conducting column 6. The overflow chamber 66 is connected to the central channel 61, and an L-shaped channel 67 is provided on one side of the overflow chamber 66, which is connected to the drain channel 54. The coolant transported in the inner flow channel 53 can enter the sealed cavity 62. On the one hand, it can flow directly into the central channel 61 of the heat-conducting column 6, and then into the overflow chamber 66 through the central channel 61, and finally be discharged into the drain channel 54 through the side channel 55. On the other hand, when the side hole 64 slides into the threaded cooling pipe 52, the coolant enters the threaded cooling pipe 52, flows downward in a spiral, and finally enters the drain channel 54 through the L-shaped channel 67. Therefore, two different flow paths can be formed, which can be easily adjusted according to specific heat dissipation conditions.

[0049] In this embodiment, both the bypass channel 55 and the L-shaped channel 67 are configured as unidirectional channels; a connecting rod 68 is vertically slidably connected inside the heat-conducting column 6, the lower end of the connecting rod 68 is connected to the regulating pipe 63, and an electromagnetic controller (not shown in the figure) is provided outside the water-cooled plate 3. One end of the electromagnetic controller is fixed to the connecting rod 68, and the electromagnetic controller is used to control the regulating pipe 63 to slide along its axial direction through the connecting rod 68, so that the end of the regulating pipe 63 is connected to or disconnected from the valve shaft 65;

[0050] Specifically, for rapid heat dissipation and cooling in high-temperature areas, the ends of the electromagnetic controllers controlling the regulating pipes 63 outside the multiple heat-conducting pillars 6 at key locations are disengaged from the valve shafts 65 (the ends of the remaining heat-conducting pillars 63 are in contact with and sealed to the valve shafts 65). At this time, the coolant mainly flows and circulates into the central channel 61 and the overflow tank 66. Most of the coolant in the inner flow channel 53 enters the heat-conducting pillar 6, with a small portion diverted to the threaded cooling pipes 52 outside the remaining heat-conducting pillars 6 to maintain normal heat dissipation. The electromagnetic controllers outside the heat-conducting pillars 6 adjacent to the high-temperature area can operate intermittently, causing the ends of the regulating pipes 63 to slide off the valve shafts 65, allowing for intermittent coolant replacement in the adjacent heat-conducting pillars 6. This design avoids heat saturation caused by long-term coolant stagnation, and each coolant replacement updates 20%-30% of the pipe volume, with single-point energy consumption only 1 / 6 of continuous cooling. Especially in high-temperature experiments on automotive batteries, multiple heat-conducting pillars 6 can ensure efficient cooling and heat dissipation in the core high-heat-generating areas, reducing the hotspot temperature rise rate from 8℃ / s. The temperature was reduced to 1℃ / s to ensure stable temperature rise of the car battery during the experiment.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery, characterized in that: It include support body (11), the upper end face center is fixed with heating box (1), the lower end face of heating box (1) is provided with vibration table (12), is provided with loading tray (13) in heating box (1); Loading unit (2) is provided in heating box (1), loading unit (2) is suspended in the direct upper of loading tray (13), and the lower end face of loading unit (2) is installed with horizontally arranged water cooling plate (3), and the liquid inlet end and liquid outlet end of circulating pump liquid device (15) are connected with water cooling plate (3) through liquid guide pipe respectively; Parallelly, a plurality of cooling channels (4) are arranged in water cooling plate (3), and a plurality of cooling units (5) are equidistantly distributed in each cooling channel (4); Loading unit (2) includes side shift carrier (21), which is symmetrically arranged on both sides, and the side shift carrier (21) is vertically fixed in heating box (1), and the horizontal beam (22) is vertically and slidably connected between the two side shift carriers (21), the lower end surface of the beam (22) is vertically fixed with a plurality of loading rods (23), and the lower end surface of the beam (22) is parallelly arranged with a fixed plate (24), and the lower end of each loading rod (23) is connected with the fixed plate (24); The connecting plate (25) is horizontally arranged between the fixed plate (24) and the beam (22), and the damping spring (26) is vertically connected to the fixed plate (24); The lower end surface of the fixed plate (24) is vertically fixed with a shaft column (27), and the lower end of the shaft column (27) is fixed with the water cooling plate (3); The flow cavity (31) is symmetrically arranged in the water cooling plate (3), and the flow cavity (31) is connected with each cooling channel (4), and the inlet (32) and the outlet are arranged outside the two flow cavities (31) respectively. A plurality of flow guide cavities (41) are distributed in the cooling channel (4), the flow guide cavities (41) are arranged one by one with the cooling units (5), the flow guide cavities (41) are configured as circular structure, the inner wall of the flow guide cavities (41) is symmetrically connected with the flow resistance plate (42), and the air bag (43) is arranged between the flow resistance plate (42) and the flow guide cavities (41). 2.The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery of claim 1, wherein: The middle part of the heating box (1) is vertically and slidably connected with the adapter tool (14), the upper end surface of the adapter tool (14) is fixed with the loading tray (13), and the lower end surface thereof is connected with the vibration output end of the vibration table (12). 3.The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery of claim 1, wherein: The loading cylinder is vertically arranged on the side shift carrier (21), and the output end of the loading cylinder is connected with the beam (22).

4. The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery according to claim 1, characterized in that: The cross section of the flow resistance plate (42) is arc-shaped structure, a plurality of airflow pipes (44) are pre-buried in the water cooling plate (3), and each airflow pipe (44) is connected with two air bags (43) in the flow guide cavities (41).

5. The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery according to claim 1, characterized in that: The cooling unit (5) comprises heat-conducting columns (6) fixed vertically in the water-cooling plate (3), the lower end surface of the heat-conducting column (6) is coaxially fixed with a heat-conducting plate (51), a positioning groove is arranged at each heat-conducting column in the water-cooling plate (3), a threaded cooling pipe (52) coaxially sleeved with the heat-conducting column is arranged in the positioning groove, and a central passage (61) is vertically arranged in the middle of the heat-conducting column (6). A plurality of inner flow channels (53) vertically distributed with the cooling channel (4) are arranged in the water-cooling plate (3), the inner flow channels (53) are arranged on one side of the heat-conducting column (6), and a discharge flow channel (54) is arranged on the other side of the heat-conducting column (6) in the water-cooling plate (3).

6. The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery according to claim 5, characterized in that: The inner flow channels (53) and the discharge flow channels (54) on both sides of the heat-conducting column (6) are connected correspondingly, and the circulating pump liquid device (15) is connected with each inner flow channel (53) through a circulating pipe.

7. The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery according to claim 5, characterized in that: A sealing cavity (62) is arranged above the heat-conducting column (6), an adjusting pipe (63) is slidably connected in the sealing cavity (62), a side hole (64) is arranged on the side wall of the adjusting pipe (63), the liquid inlet end of the threaded cooling pipe (52) is connected to one side of the sealing cavity (62), and the liquid outlet end is connected with the discharge flow channel (54) through a bypass channel (55); A valve shaft (65) is fixed in the heat-conducting column (6), and the valve shaft (65) is slidably connected with the end of the adjusting pipe (63); An annular overflow warehouse (66) is arranged in the heat-conducting column (6), the overflow warehouse (66) is connected with the central passage (61), and an L-shaped channel (67) is arranged on one side of the overflow warehouse (66), and the L-shaped channel (67) is connected with the discharge flow channel (54). 8.The high-efficiency water cooling system for high-temperature vibration test of an electric vehicle battery of claim 7, characterized in that: The bypass channel (55) and the L-shaped channel (67) are both arranged as one-way channels, a connecting rod (68) is slidably connected in the heat-conducting column (6), the lower end of the connecting rod (68) is connected with the adjusting pipe (63), and an electromagnetic controller is arranged outside the water-cooling plate (3), one end of the electromagnetic controller is fixed with the connecting rod (68).

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