A method and system for determining chain tension in a v-type engine

Abstract

The embodiment of the application discloses a V-type engine chain tension determination method and system. The method comprises the following steps: obtaining current operation information of a V-type engine in a target vehicle; determining a current correlation coefficient between a voltage signal and chain tension under the current operation information; determining a current first chain tension based on a current first voltage signal collected by a first collection device and the current correlation coefficient, the first collection device being fixed on a lower end rail assembly of a crankshaft driving chain in the V-type engine; determining a current second chain tension based on a current second voltage signal collected by a second collection device and the current correlation coefficient, the second collection device being fixed on a left column camshaft chain rail assembly in the V-type engine; and determining a current third chain tension based on a current third voltage signal collected by a third collection device and the current correlation coefficient, the third collection device being fixed on a right column camshaft chain rail assembly in the V-type engine, so that the chain tension of the V-type engine is accurately determined.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of mechanics, and in particular to a method and system for determining the chain tension of a V-type engine. Background Technology

[0002] In a car, a V-type engine divides all cylinders into two groups, arranging adjacent cylinders at a certain angle to form a group of cylinders with an angle. Each group of cylinders is driven by a chain. However, if the chain tension exceeds its maximum capacity, chain failure can occur, such as chain breakage, guide rail breakage, or guide rail bolt breakage.

[0003] Currently, strain gauges are commonly used to measure chain tension to prevent chain failure. However, this method results in significant deviations in the measured chain tension, and these deviations are influenced by various factors such as impact, temperature changes, and data processing. Therefore, this measurement method cannot accurately determine the chain tension during engine operation, and it cannot guarantee the consistency of the measured chain tension each time. Summary of the Invention

[0004] This invention provides a method and system for determining the chain tension of a V-type engine, so as to accurately determine the chain tension of a V-type engine.

[0005] In a first aspect, embodiments of the present invention provide a method for determining the chain tension of a V-type engine, the method comprising:

[0006] Obtain the current operating information of the V-type engine in the target vehicle, wherein the current operating information includes: the current engine speed and the current engine load;

[0007] Based on the current operating information and the correlation coefficient between the voltage signal and the chain tension under each preset operating information obtained through pre-calibration, the current correlation coefficient between the voltage signal and the chain tension under the current operating information is determined;

[0008] The first acquisition device acquires the current first voltage signal and, based on the current first voltage signal and the current correlation coefficient, determines the current first chain tension corresponding to the crankshaft drive chain in the V-type engine, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine.

[0009] The current second voltage signal acquired by the second acquisition device is obtained, and the current second chain tension corresponding to the left camshaft chain in the V-type engine is determined based on the current second voltage signal and the current correlation coefficient. The second acquisition device is fixed on the left camshaft chain guide assembly in the V-type engine.

[0010] The current third voltage signal acquired by the third acquisition device is obtained, and the current third chain tension corresponding to the right camshaft chain in the V-type engine is determined based on the current third voltage signal and the current correlation coefficient. The third acquisition device is fixed on the right camshaft chain guide assembly in the V-type engine.

[0011] Secondly, embodiments of the present invention provide a V-type engine chain tension determination system, the system comprising: a V-type engine chain, a first acquisition device, a second acquisition device, a third acquisition device, and a data processor; wherein,

[0012] The data processor is used to implement the V-type engine chain tension determination method as described in any embodiment of the present invention.

[0013] The technical solution of this invention involves acquiring the current operating information of a V-type engine in a target vehicle, including the current engine speed and current engine load; determining a current correlation coefficient between the voltage signal and chain tension under the current operating information based on the current operating information and a pre-calibrated correlation coefficient between the voltage signal and chain tension under each preset operating information; acquiring a current first voltage signal acquired by a first acquisition device, and determining the current first chain tension corresponding to the crankshaft drive chain in the V-type engine based on the current first voltage signal and the current correlation coefficient, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine; acquiring a current second voltage signal acquired by a second acquisition device, and determining the current first chain tension of the V-type engine based on the current second voltage signal and the current correlation coefficient. The second acquisition device is fixed on the left-hand camshaft chain guide assembly of the V-type engine, which acquires the current third voltage signal collected by the third acquisition device. Based on the current third voltage signal and the current correlation coefficient, the current third chain tension corresponding to the right-hand camshaft chain of the V-type engine is determined. The third acquisition device is fixed on the right-hand camshaft chain guide assembly of the V-type engine. This allows for the direct use of the voltage signals corresponding to the respective chains acquired by each acquisition device and the pre-calibrated correlation coefficient between the voltage signal and the chain tension to accurately determine the chain tension of each chain. This avoids the inaccurate chain tension measurement caused by strain gauges and allows for the simultaneous determination of multiple chain tensions without interference, improving the accuracy and efficiency of chain tension determination.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of a method for determining the chain tension of a V-type engine according to Embodiment 1 of the present invention;

[0017] Figure 2 This is an example diagram of a V-type engine chain according to Embodiment 1 of the present invention;

[0018] Figure 3 This is an example diagram of a first data acquisition device according to Embodiment 1 of the present invention;

[0019] Figure 4 This is an example diagram of a second data acquisition device according to Embodiment 1 of the present invention;

[0020] Figure 5 This is an example diagram of a third acquisition device according to Embodiment 1 of the present invention;

[0021] Figure 6 This is a flowchart of another method for determining the chain tension of a V-type engine provided in Embodiment 2 of the present invention;

[0022] Figure 7 This is an example diagram of a correlation coefficient calibration system according to Embodiment 2 of the present invention;

[0023] Figure 8 This is a schematic diagram of a V-type engine chain tension determination system provided in Embodiment 3 of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] Example 1

[0027] Figure 1 This is a flowchart of a method for determining the tension of a V-type engine chain according to Embodiment 1 of the present invention. The method for determining the tension of a V-type engine chain provided in this embodiment is applicable to situations where the chain tension in a V-type engine chain needs to be determined, and is particularly suitable for determining the tension of the tight side chain in a V-type engine chain. This method can be executed by a V-type engine chain tension determination system, which can be implemented in hardware and / or software. Figure 1 As shown, the method includes:

[0028] S110. Obtain the current operating information of the V-type engine in the target vehicle. The current operating information includes: the current engine speed and the current engine load.

[0029] The target vehicle can refer to a vehicle equipped with a V-type engine. The target vehicle also includes a V-type engine chain tension determination system. The V-type engine chain tension determination system includes a V-type engine chain, a first acquisition device, a second acquisition device, a third acquisition device, and a data processor. The data processor can be used to execute the V-type engine chain tension determination method.

[0030] Specifically, the V-type engine information collector can collect the current engine speed and current engine load of the V-type engine at the current moment, and send the collected current engine speed and current engine load to the data processor of the V-type engine chain tension determination system. Alternatively, the data processor can obtain the current operating information of the V-type engine in the target vehicle stored in the information collector, including the current engine speed and current engine load.

[0031] For example, Figure 2 An example diagram of a V-type engine chain is provided. See also... Figure 2The V-type engine chain may include crankshaft sprocket 21, crankshaft chain 22, crankshaft drive chain lower end guide rail assembly 23, left camshaft chain 24, left camshaft chain guide rail assembly 25, right camshaft chain 26, and right camshaft chain guide rail assembly 27.

[0032] S120. Based on the current operating information and the correlation coefficient between the voltage signal and the chain tension under each preset operating information obtained by pre-calibration, determine the current correlation coefficient between the voltage signal and the chain tension under the current operating information.

[0033] The preset operating information may include preset engine speed and preset engine load. The correlation coefficient can be used to characterize the weighting value between the voltage signal and chain tension. The current correlation coefficient refers to the weighting value between the voltage signal and chain tension under the current operating information. The voltage signal can refer to the voltage value.

[0034] Specifically, the correlation coefficients between voltage signals and chain tension under multiple pre-calibrated operating conditions are obtained. Based on the current operating information, the correlation coefficient between voltage signals and chain tension under pre-calibrated operating conditions consistent with the current operating information is determined, thereby determining the current correlation coefficient between voltage signals and chain tension under the current operating conditions. Furthermore, by using the pre-calibrated correlation coefficients, the consistency of the chain tension determination standard can be ensured, further improving the accuracy of chain tension determination.

[0035] For example, the correlation coefficient between the voltage signal and chain tension under each preset operating condition is pre-calibrated. A relationship curve between the voltage signal and chain tension can be determined based on the voltage signal, chain tension, and correlation coefficient. The current chain tension can then be determined using this relationship curve and the acquired current voltage signal. Simultaneously, the simulation results of chain tension calculated by Computer-Aided Engineering (CAE) during vehicle development can be verified, thus avoiding a sole reliance on CAE during chain system development. This provides more effective guidance for chain system development and more effectively mitigates chain system failures.

[0036] S130. Acquire the current first voltage signal collected by the first acquisition device, and determine the current first chain tension corresponding to the crankshaft drive chain in the V-type engine based on the current first voltage signal and the current correlation coefficient, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine.

[0037] The first acquisition device can be used to determine the voltage signal corresponding to the applied force. The current first voltage signal can refer to the voltage signal determined by the first acquisition device at the current moment based on the chain tension. The first acquisition device is fixed to the lower end guide rail assembly of the crankshaft drive chain by bracket fixing bolts. The current first chain tension can refer to the tension of the tight side of the crankshaft drive chain in a V-type engine.

[0038] Specifically, the current first voltage signal acquired by the first acquisition device is obtained. The current first voltage signal is multiplied by the current correlation coefficient to obtain the multiplication result, which is then used to determine the current first chain tension corresponding to the crankshaft drive chain in the V-type engine. The advantage of this approach is that it avoids the inaccurate chain tension obtained by directly measuring with strain gauges. The acquisition device first determines the voltage signal corresponding to the chain tension, and then uses a pre-calibrated correlation coefficient between the voltage signal and the chain tension to determine the accurate chain tension. Furthermore, it can determine multiple chain tensions simultaneously without interference, further improving the accuracy and efficiency of chain tension determination.

[0039] For example, Figure 3 An example diagram of a first data acquisition device is provided. See also... Figure 3 The first data acquisition device may include a force sensor 31, a sensor bracket 32, a bracket fixing bolt 33, a sensor force application bolt 34, a cylinder 35, and a signal amplifier 36. The sensor force application bolt 34 in the first data acquisition device is fixed on the sensor bracket 32, and the force-bearing protrusion side of the force sensor 31 faces the sensor force application bolt 34, while the other side of the force sensor 31 is fixed on the cylinder 35.

[0040] S140. Acquire the current second voltage signal collected by the second acquisition device, and determine the current second chain tension corresponding to the left camshaft chain in the V-type engine based on the current second voltage signal and the current correlation coefficient, wherein the second acquisition device is fixed on the left camshaft chain guide assembly in the V-type engine.

[0041] The second acquisition device can be used to determine the voltage signal corresponding to the applied force. The current second voltage signal can refer to the voltage signal determined by the second acquisition device at the current moment based on the chain tension. The second acquisition device is fixed to the left camshaft chain guide assembly by bracket fixing bolts. The current second chain tension can refer to the tension of the tight side of the left camshaft chain in a V-type engine.

[0042] Specifically, the current second voltage signal acquired by the second acquisition device is obtained. The current second voltage signal is multiplied by the current correlation coefficient to obtain the multiplication result, and the multiplication result is determined as the current second chain tension corresponding to the left camshaft chain in the V-type engine.

[0043] For example, Figure 4 An example diagram of a second data acquisition device is provided. See also... Figure 4 The second data acquisition device may include a force sensor 41, a sensor bracket 42, a bracket fixing bolt 43, a sensor force application bolt 44, a left cylinder head 45, and a signal amplifier 46. The sensor force application bolt 44 in the second data acquisition device is fixed on the sensor bracket 42, and the force-bearing protrusion side of the force sensor 41 faces the sensor force application bolt 44, while the other side of the force sensor 41 is fixed on the left cylinder head 45.

[0044] S150. Acquire the current third voltage signal collected by the third acquisition device, and determine the current third chain tension corresponding to the right camshaft chain in the V-type engine based on the current third voltage signal and the current correlation coefficient. The third acquisition device is fixed on the right camshaft chain guide assembly in the V-type engine.

[0045] The third acquisition device can be used to determine the voltage signal corresponding to the applied force. The current third voltage signal can refer to the voltage signal determined by the third acquisition device at the current moment based on the chain tension. The third acquisition device is fixed to the right-hand camshaft chain guide assembly by bracket fixing bolts. The current third chain tension can refer to the tension of the tight side of the right-hand camshaft chain in a V-type engine.

[0046] Specifically, the current third voltage signal acquired by the third acquisition device is obtained. The current third voltage signal is multiplied by the current correlation coefficient to obtain the multiplication result, and the multiplication result is determined as the current third chain tension corresponding to the right camshaft chain in the V-type engine.

[0047] For example, Figure 5 An example diagram of a third data acquisition device is provided. See also... Figure 5 The third acquisition device may include a force sensor 51, a sensor bracket 52, a bracket fixing bolt 53, a sensor force application bolt 54, a right cylinder head 55, and a signal amplifier 56. The sensor force application bolt 54 in the third acquisition device is fixed on the sensor bracket 52, and the force-bearing protrusion side of the force sensor 51 faces the sensor force application bolt 54, while the other side of the force sensor 51 is fixed on the right cylinder head 55.

[0048] It should be noted that the force sensor in each acquisition device is used to determine the candidate voltage signal on the guide rail where each acquisition device is located, and sends the candidate voltage signal to the signal amplifier in each acquisition device; the force sensor and the signal amplifier are connected through a data transmission line; the signal amplifier in each acquisition device is used to amplify and enhance the received candidate voltage signal to obtain the amplified and enhanced current voltage signal, and sends the current voltage signal to the data processor; the signal amplifier and the data processor are connected through a data transmission line.

[0049] The technical solution of this invention involves acquiring the current operating information of a V-type engine in a target vehicle, including the current engine speed and current engine load; determining the current correlation coefficient between the voltage signal and chain tension under the current operating information based on the current operating information and the correlation coefficient between the voltage signal and chain tension under each preset operating information obtained through pre-calibration; acquiring the current first voltage signal collected by a first acquisition device, and determining the current first chain tension corresponding to the crankshaft drive chain in the V-type engine based on the current first voltage signal and the current correlation coefficient, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine; acquiring the current second voltage signal collected by a second acquisition device, and determining the tension of the left column convex chain in the V-type engine based on the current second voltage signal and the current correlation coefficient. The current second chain tension corresponding to the wheel axle chain is determined by the second acquisition device, which is fixed on the left-row camshaft chain guide assembly in the V-type engine. The current third voltage signal acquired by the third acquisition device is obtained, and based on the current third voltage signal and the current correlation coefficient, the current third chain tension corresponding to the right-row camshaft chain in the V-type engine is determined. The third acquisition device is fixed on the right-row camshaft chain guide assembly in the V-type engine. This allows for the direct use of the voltage signals corresponding to each chain acquired by each acquisition device, and the pre-calibrated correlation coefficient between the voltage signal and the chain tension, to accurately determine the chain tension of each chain. This avoids the inaccurate chain tension measurement caused by strain gauges, and allows for the simultaneous determination of multiple chain tensions without interference, improving the accuracy and efficiency of chain tension determination.

[0050] Based on the above technical solution, the mounting bolts in each data acquisition device pass through the corresponding sensor brackets, with a protruding length of no less than 1mm. The sensor brackets in each data acquisition device are L-shaped. The most direct force on the force sensor in each data acquisition device comes from the sensor's force-applying bolt. The flange of the sensor's force-applying bolt is circular, and an "a" is cut on the top of the flange. The cross groove is 'a'. For example, 'a' can be, but is not limited to, 2mm. Silicone sealant can be used to seal the gap between the force sensor data cable and the chain cover. The bracket fixing bolts in each acquisition device are clearance-fitted with the crankshaft drive chain lower guide rail assembly, the left camshaft chain guide rail assembly, and the right camshaft chain guide rail assembly, with a clearance of 'b' on one side. For example, 'b' can be, but is not limited to, 0.1mm. In this invention, the force sensor is separated from the guide rail by a small distance, so that the force sensor is not affected by the tangential force from the chain rotation direction or the vibration caused by the target vehicle during operation, further improving the accuracy of chain tension determination.

[0051] Example 2

[0052] Figure 6 This is a flowchart of a method for determining the chain tension of a V-type engine according to Embodiment 2 of the present invention. Based on the above embodiments, this embodiment describes in detail the calibration process of the correlation coefficient between the voltage signal and the chain tension under each preset operating condition. Explanations of terms that are the same as or corresponding to those in the above embodiments are not repeated here. Figure 6 As shown, the method includes:

[0053] S610. For each preset operating information, during each stamping operation under that preset operating information, the pressure value applied by the pressure bar controlled by the control panel is obtained. The control panel controls the pressure bar to perform the stamping operation by setting a preset initial pressure value, a preset incremental pressure value, and a preset number of pressurization cycles. The pressure value is used to characterize the chain tension.

[0054] The control panel controls the pressure bar to perform the stamping operation by setting a preset initial pressure value, a preset incremental pressure value, and a preset number of pressurization cycles. For example, if the preset initial pressure value is 20N, the preset incremental pressure value is 2N, and the preset number of pressurization cycles is 40, then the pressure value when the control panel controls the pressure bar to perform the first stamping operation is 20N; the pressure value when the control panel controls the pressure bar to perform the fifth stamping operation is 28N. When the control panel controls the pressure bar to complete the preset number of pressurization cycles (e.g., 40), the stamping operation stops, and the relevant coefficient calibration is performed under the next preset operating information.

[0055] For example, Figure 7 An example diagram of a correlation coefficient calibration system is provided. See [link / reference] Figure 7The correlation coefficient calibration system may include a press 71, a pressure rod 72, a control panel 73, a force sensor 74, a signal amplifier 75, and a data processor 76. The pressure rod 72 is located directly above the force-bearing protrusion of the force sensor 74 and is vertically fixed to the upper layer of the press 71. The control panel 73 is connected to the upper end of the pressure rod 72 and is used to control the force applied by the pressure rod 72. The force sensor 74 is fixed to the lower layer of the press 71. The signal amplifier 75 is connected to the force sensor 74 via a data transmission line. The data processor 76 is connected to the signal amplifier 75 via a data transmission line and is used to acquire the pressure value from the control panel 73 and the amplified voltage signal from the signal amplifier 75.

[0056] S620. During each stamping operation, the current voltage signal sent by the signal amplifier is acquired. The current voltage signal is obtained by the signal amplifier amplifying and enhancing the alternative voltage signal collected by the force sensor.

[0057] Among them, the alternative voltage signal can refer to the voltage signal directly collected by the force sensor.

[0058] S630. Based on each pressure value and the current voltage signal corresponding to each stamping operation, determine the correlation coefficient between the voltage signal and the chain tension under the preset operating information.

[0059] Once the correlation coefficient between the voltage signal and the chain tension under each preset operating condition is determined, the correlation coefficient can be pre-stored in the data processor of the V-type engine chain tension determination system so that it can be directly called when the chain tension needs to be determined, thereby improving the efficiency of chain tension determination.

[0060] For example, each data acquisition device can be configured with its own signal amplifier, meaning each device can be installed on the target vehicle, and the data connection cable between the signal amplifier and the data processor can be led out from the cover and sealed. Alternatively, all data acquisition devices can share a single signal amplifier, meaning each device can be installed on the target vehicle, and the data connection cable between the shared signal amplifier and the force sensor can be led out from the cover and sealed.

[0061] S640. Obtain the current operating information of the V-type engine in the target vehicle. The current operating information includes: current engine speed and current engine load.

[0062] S650. Based on the current operating information and the correlation coefficient between the voltage signal and the chain tension under each preset operating information obtained through pre-calibration, determine the current correlation coefficient between the voltage signal and the chain tension under the current operating information.

[0063] S660. Acquire the current first voltage signal collected by the first acquisition device, and determine the current first chain tension corresponding to the crankshaft drive chain in the V-type engine based on the current first voltage signal and the current correlation coefficient, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine.

[0064] S670. Acquire the current second voltage signal collected by the second acquisition device, and determine the current second chain tension corresponding to the left camshaft chain in the V-type engine based on the current second voltage signal and the current correlation coefficient, wherein the second acquisition device is fixed on the left camshaft chain guide assembly in the V-type engine.

[0065] S680. Acquire the current third voltage signal collected by the third acquisition device, and determine the current third chain tension corresponding to the right camshaft chain in the V-type engine based on the current third voltage signal and the current correlation coefficient. The third acquisition device is fixed on the right camshaft chain guide assembly in the V-type engine.

[0066] The technical solution of this invention, for each preset operating information, acquires the pressure value of the pressure bar applied by the control panel during each stamping operation. The control panel controls the pressure bar to perform the stamping operation based on a preset initial pressure value, a preset incremental pressure value, and a preset number of pressurization cycles. The pressure value characterizes the chain tension. During each stamping operation, the current voltage signal sent by the signal amplifier is acquired. The current voltage signal is obtained by amplifying and enhancing the candidate voltage signal collected by the force sensor. Based on each pressure value and the current voltage signal corresponding to each stamping operation, the correlation coefficient between the voltage signal and the chain tension under the preset operating information is determined. After the correlation coefficient between the voltage signal and the chain tension under each preset operating information is determined, it can be pre-stored in the data processor of the V-type engine chain tension determination system so that it can be directly called when chain tension needs to be determined, further improving the efficiency of chain tension determination.

[0067] Based on the above technical solution, S630 may include: substituting each pressure value and the current voltage signal corresponding to each stamping operation into the least squares method to determine the relationship parameter; determining the difference between each pressure value and the relationship parameter; dividing each difference and the current voltage signal corresponding to each stamping operation to obtain the division result, and determining the division result as the correlation coefficient between the voltage signal and the chain tension under the preset operating information.

[0068] The formula for determining the correlation coefficient between the voltage signal and the chain tension is as follows:

[0069]

[0070] It can refer to the correlation coefficient between the voltage signal and the chain tension. This could refer to obtaining the pressure value applied by the pressure bar controlled by the control panel during each stamping operation. This could refer to acquiring the current voltage signal sent by the signal amplifier during each stamping operation. This could refer to relational parameters. Each data acquisition device needs to undergo pre-calibration. Generally, for the same vehicle model, the correlation coefficient between the voltage signal and chain tension is the same under each preset operating condition. However, differences may exist. Therefore, to ensure the accuracy of chain tension determination, the correlation coefficient between the voltage signal and chain tension can be calibrated for each vehicle.

[0071] The following is an embodiment of a V-type engine chain tension determination system provided by the present invention. This device and the V-type engine chain tension determination method described in the above embodiments belong to the same inventive concept. For details not described in detail in the embodiment of the V-type engine chain tension determination system, please refer to the embodiment of the V-type engine chain tension determination method described above.

[0072] Example 3

[0073] Figure 8 This is a schematic diagram of a V-type engine chain tension determination system provided in Embodiment 1 of the present invention. The V-type engine chain tension determination system provided in this embodiment is applicable to determining the chain tension in a V-type engine chain. Figure 8 As shown, the V-type engine chain tension determination system includes: a V-type engine chain 81, a first acquisition device 82, a second acquisition device 83, a third acquisition device 84, and a data processor 85.

[0074] The data processor 85 is used to acquire the current operating information of the V-type engine in the target vehicle, including the current engine speed and current engine load. The data processor 85 is also used to determine the current correlation coefficient between the voltage signal and chain tension under the current operating information based on the current operating information and the correlation coefficient between the voltage signal and chain tension under each preset operating information obtained through pre-calibration. Furthermore, the data processor 85 is used to acquire the current first voltage signal collected by the first acquisition device 82, and based on the current first voltage signal and the current correlation coefficient, determine the current first chain tension corresponding to the crankshaft drive chain in the V-type engine. The first acquisition device 82 is fixed within the V-type engine. On the lower end guide rail assembly of the crankshaft drive chain; a data processor 85 is used to acquire the current second voltage signal acquired by the second acquisition device 83, and determine the current second chain tension corresponding to the left camshaft chain in the V-type engine based on the current second voltage signal and the current correlation coefficient, wherein the second acquisition device 83 is fixed on the left camshaft chain guide rail assembly in the V-type engine; the data processor 85 is used to acquire the current third voltage signal acquired by the third acquisition device 84, and determine the current third chain tension corresponding to the right camshaft chain in the V-type engine based on the current third voltage signal and the current correlation coefficient, wherein the third acquisition device 84 is fixed on the right camshaft chain guide rail assembly in the V-type engine.

[0075] The technical solution of this invention involves acquiring the current operating information of a V-type engine in a target vehicle, including the current engine speed and current engine load; determining the current correlation coefficient between the voltage signal and chain tension under the current operating information based on the current operating information and the correlation coefficient between the voltage signal and chain tension under each preset operating information obtained through pre-calibration; acquiring the current first voltage signal collected by a first acquisition device, and determining the current first chain tension corresponding to the crankshaft drive chain in the V-type engine based on the current first voltage signal and the current correlation coefficient, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine; acquiring the current second voltage signal collected by a second acquisition device, and determining the tension of the left column convex chain in the V-type engine based on the current second voltage signal and the current correlation coefficient. The current second chain tension corresponding to the wheel axle chain is determined by the second acquisition device, which is fixed on the left-row camshaft chain guide assembly in the V-type engine. The current third voltage signal acquired by the third acquisition device is obtained, and based on the current third voltage signal and the current correlation coefficient, the current third chain tension corresponding to the right-row camshaft chain in the V-type engine is determined. The third acquisition device is fixed on the right-row camshaft chain guide assembly in the V-type engine. This allows for the direct use of the voltage signals corresponding to each chain acquired by each acquisition device, and the pre-calibrated correlation coefficient between the voltage signal and the chain tension, to accurately determine the chain tension of each chain. This avoids the inaccurate chain tension measurement caused by strain gauges, and allows for the simultaneous determination of multiple chain tensions without interference, improving the accuracy and efficiency of chain tension determination.

[0076] Based on the above technical solution, the V-type engine chain includes: crankshaft sprocket, crankshaft chain, crankshaft drive chain lower end guide rail assembly, left camshaft chain, left camshaft chain guide rail assembly, right camshaft chain, and right camshaft chain guide rail assembly.

[0077] Based on the above technical solution, the first acquisition device 82 includes: a force sensor, a sensor bracket, a bracket fixing bolt, a sensor force application bolt, a cylinder block, and a signal amplifier; the second acquisition device 83 includes: a force sensor, a sensor bracket, a bracket fixing bolt, a sensor force application bolt, a left cylinder head, and a signal amplifier; the third acquisition device 84 includes: a force sensor, a sensor bracket, a bracket fixing bolt, a sensor force application bolt, a right cylinder head, and a signal amplifier; wherein, the first acquisition device 82 is fixed to the lower end guide rail assembly of the crankshaft drive chain by the bracket fixing bolt; the second acquisition device 83 is fixed to the left camshaft chain guide rail assembly by the bracket fixing bolt; and the third acquisition device 84 is fixed to the right camshaft chain guide rail assembly by the bracket fixing bolt.

[0078] Based on the above technical solution, the mounting bolts in each data acquisition device pass through the corresponding sensor brackets, with a protruding length of no less than 1mm. The sensor brackets in each data acquisition device are L-shaped. The most direct force on the force sensor in each data acquisition device comes from the sensor's force-applying bolt. The flange of the sensor's force-applying bolt is circular, and an "a" is cut on the top of the flange. The cross groove is 'a'. For example, 'a' can be, but is not limited to, 2mm. Silicone sealant can be used to seal the gap between the force sensor data cable and the chain cover. The bracket fixing bolts in each acquisition device are clearance-fitted with the crankshaft drive chain lower guide rail assembly, the left camshaft chain guide rail assembly, and the right camshaft chain guide rail assembly, with a clearance of 'b' on one side. For example, 'b' can be, but is not limited to, 0.1mm.

[0079] Based on the above technical solutions, the sensor force bolt in the first acquisition device 82 is fixed on the sensor bracket, and the force-bearing protrusion of the force sensor faces the sensor force bolt, while the other side of the force sensor is fixed on the cylinder block; the sensor force bolt in the second acquisition device 83 is fixed on the sensor bracket, and the force-bearing protrusion of the force sensor faces the sensor force bolt, while the other side of the force sensor is fixed on the left cylinder head; the sensor force bolt in the third acquisition device 84 is fixed on the sensor bracket, and the force-bearing protrusion of the force sensor faces the sensor force bolt, while the other side of the force sensor is fixed on the right cylinder head.

[0080] Based on the above technical solution, the force sensor in each acquisition device is used to determine the candidate voltage signal on the guide rail where each acquisition device is located, and send the candidate voltage signal to the signal amplifier in each acquisition device; the force sensor and the signal amplifier are connected through a data transmission line; the signal amplifier in each acquisition device is used to amplify and enhance the received candidate voltage signal to obtain the amplified and enhanced current voltage signal, and send the current voltage signal to the data processor 85; the signal amplifier and the data processor 85 are connected through a data transmission line.

[0081] Based on the above technical solution, the system further includes: a correlation coefficient calibration system; wherein, the correlation coefficient calibration system may include a press, a pressure bar, a control panel, a force sensor, a signal amplifier, and a data processor 85. The pressure bar is located directly above the force-bearing convex bulge of the force sensor and is vertically fixed to the upper layer of the press; the control panel is connected to the upper end of the pressure bar and is used to control the pressure bar to apply force; the force sensor is fixed to the lower layer of the press; the signal amplifier is connected to the force sensor via a data transmission line. The data processor 85 is connected to the signal amplifier via a data transmission line and is used to acquire the pressure value from the control panel and the amplified voltage signal from the signal amplifier.

[0082] Based on the above technical solution, the correlation coefficient calibration process includes: using a correlation coefficient calibration system, for each preset operating information, during each stamping operation under that preset operating information, the pressure value applied by the pressure bar controlled by the control panel is obtained. The control panel controls the pressure bar to perform the stamping operation through preset initial pressure values, preset incremental pressure values, and preset number of pressurization cycles. The pressure value is used to characterize the chain tension. During each stamping operation, the current voltage signal sent by the signal amplifier is obtained. The current voltage signal is obtained by amplifying and enhancing the alternative voltage signal collected by the force sensor. Based on each pressure value and the current voltage signal corresponding to each stamping operation, the correlation coefficient between the voltage signal and the chain tension under that preset operating information is determined.

[0083] Based on the above technical solution, a correlation coefficient calibration system can be used to substitute each pressure value and the current voltage signal corresponding to each stamping operation into the least squares method to determine the relationship parameters; determine the difference between each pressure value and the relationship parameters; divide each difference and the current voltage signal corresponding to each stamping operation to obtain the division result, and determine the division result as the correlation coefficient between the voltage signal and the chain tension under the preset operating information.

[0084] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0085] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for determining the chain tension of a V-type engine, characterized in that, include: Obtain the current operating information of the V-type engine in the target vehicle, wherein the current operating information includes: the current engine speed and the current engine load; Based on the current operating information and the correlation coefficient between the voltage signal and the chain tension under each preset operating information obtained through pre-calibration, the current correlation coefficient between the voltage signal and the chain tension under the current operating information is determined; The first acquisition device acquires the current first voltage signal and, based on the current first voltage signal and the current correlation coefficient, determines the current first chain tension corresponding to the crankshaft drive chain in the V-type engine, wherein the first acquisition device is fixed on the lower end guide rail assembly of the crankshaft drive chain in the V-type engine. The current second voltage signal acquired by the second acquisition device is obtained, and the current second chain tension corresponding to the left camshaft chain in the V-type engine is determined based on the current second voltage signal and the current correlation coefficient. The second acquisition device is fixed on the left camshaft chain guide assembly in the V-type engine. The current third voltage signal acquired by the third acquisition device is obtained, and the current third chain tension corresponding to the right camshaft chain in the V-type engine is determined based on the current third voltage signal and the current correlation coefficient. The third acquisition device is fixed on the right camshaft chain guide assembly in the V-type engine.

2. The method according to claim 1, characterized in that, The V-type engine chain includes: crankshaft sprocket, crankshaft chain, crankshaft drive chain lower end guide rail assembly, left camshaft chain, left camshaft chain guide rail assembly, right camshaft chain, and right camshaft chain guide rail assembly.

3. The method according to claim 2, characterized in that, The first data acquisition device includes: a force sensor, a sensor bracket, bracket fixing bolts, a sensor force application bolt, a cylinder, and a signal amplifier; The second data acquisition device includes: a force sensor, a sensor bracket, bracket fixing bolts, a sensor force application bolt, a left cylinder head, and a signal amplifier; The third data acquisition device includes: a force sensor, a sensor bracket, bracket fixing bolts, a sensor force application bolt, a right cylinder head, and a signal amplifier; wherein... The first acquisition device is fixed to the lower end guide rail assembly of the crankshaft drive chain by bracket fixing bolts; The second acquisition device is fixed to the left-side camshaft chain guide assembly by bracket fixing bolts; The third acquisition device is fixed to the right-side camshaft chain guide assembly by bracket fixing bolts.

4. The method according to claim 3, characterized in that, The mounting bolts of each data acquisition device pass through the corresponding sensor bracket, with the exposed length not less than 1mm.

5. The method according to claim 3, characterized in that, In the first acquisition device, the sensor force bolt is fixed on the sensor bracket, and the force-bearing protrusion of the force sensor faces the sensor force bolt, while the other side of the force sensor is fixed on the cylinder. In the second acquisition device, the sensor force bolt is fixed on the sensor bracket, and the force-bearing protrusion side of the force sensor faces the sensor force bolt, while the other side of the force sensor is fixed on the left cylinder head. The sensor force bolt in the third acquisition device is fixed on the sensor bracket, and the force-bearing protrusion of the force sensor faces the sensor force bolt, while the other side of the force sensor is fixed on the right cylinder head.

6. The method according to claim 3, characterized in that, The force sensor in each acquisition device is used to determine the alternative voltage signal on the guide rail where each acquisition device is located, and sends the alternative voltage signal to the signal amplifier in each acquisition device; the force sensor and the signal amplifier are connected through a data transmission line; The signal amplifier in each acquisition device is used to amplify and enhance the received candidate voltage signal to obtain the amplified and enhanced current voltage signal, and send the current voltage signal to the data processor; the signal amplifier and the data processor are connected through a data transmission line.

7. The method according to claim 1, characterized in that, The calibration process for the correlation coefficient between the voltage signal and chain tension under each preset operating condition includes: For each preset operating information, during each stamping operation under that preset operating information, the pressure value applied by the pressure bar controlled by the control panel is obtained. The control panel controls the pressure bar to perform the stamping operation through a preset initial pressure value, a preset incremental pressure value, and a preset number of pressurization cycles. The pressure value is used to characterize the chain tension. During each stamping operation, the current voltage signal sent by the signal amplifier is acquired. The current voltage signal is obtained by the signal amplifier amplifying and enhancing the alternative voltage signal collected by the force sensor. Based on each pressure value and the current voltage signal corresponding to each stamping operation, the correlation coefficient between the voltage signal and the chain tension is determined under the preset operating information.

8. The method according to claim 7, characterized in that, The pressure bar is located directly above the force-receiving protrusion of the force sensor, and the pressure bar is vertically fixed to the upper layer of the press. The control panel is connected to the upper end of the pressure bar and is used to control the pressure bar to apply force. The force sensor is fixed to the lower layer of the press. The signal amplifier is connected to the force sensor via a data transmission line.

9. The method according to claim 7, characterized in that, Based on each pressure value and the current voltage signal corresponding to each stamping operation, determine the correlation coefficient between the voltage signal and the chain tension under the preset operating information, including: Substitute each pressure value and the current voltage signal corresponding to each stamping operation into the least squares method to determine the relationship parameters; Determine the difference between each pressure value and the relationship parameter; Divide each difference by the current voltage signal corresponding to each stamping operation to obtain the division result, and determine the division result as the correlation coefficient between the voltage signal and the chain tension under the preset operating information.

10. A V-type engine chain tension determination system, characterized in that, The system includes: a V-type engine chain, a first data acquisition device, a second data acquisition device, a third data acquisition device, and a data processor; The data processor is used to implement the method for determining the chain tension of a V-type engine as described in any of claims 1-9.

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