Vehicle-mounted suspension state measurement device and method

Abstract

The present invention discloses a vehicle-mounted suspension state measurement device and method. It includes a main body structure for connecting to the vehicle suspension and installing a detection unit; a detection unit for detecting the strain data of the vehicle suspension; a signal processing unit for processing the strain data; an operation unit for determining the force information of the vehicle suspension based on the processed strain data; and a network unit for synchronously converting the force information and sending it to the chassis CAN network. The present invention obtains the local force state and strain state of the suspension through the detection unit arranged on the main body structure, processes and calculates the detected data through the processing unit and the operation unit, thereby obtaining the force information of the vehicle suspension, and packaging it and sending it to the chassis network for the chassis domain control system to call. The device has a simple structure, reasonable design, convenient measurement, and strong versatility, which solves the problem that the user's vehicle suspension force and displacement information cannot be obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobiles, and in particular relates to a device and method for measuring the state of a vehicle suspension. Background Art

[0002] Intelligent, by-wire chassis require data on the suspension's force and motion states. This data provides information on vehicle and tire forces, center of mass height, and other factors for evaluating the vehicle's driving environment. Currently, suspension state measurement is primarily performed using specialized equipment such as six-component wheel center force data collectors and cable-type distance measurement tools. These six-component force data collectors and cable-type displacement sensors are primarily used by automakers for road data collection. However, due to their complex structure, these devices are not suitable for mass-production installation on customer vehicles. Summary of the Invention

[0003] The purpose of the present invention is to solve the deficiencies in the above-mentioned background technology and to provide a vehicle-mounted suspension state measuring device and method.

[0004] The technical solution adopted by the present invention is: a vehicle-mounted suspension state measuring device, comprising a main body structure for connecting with the vehicle suspension and installing a detection unit;

[0005] A detection unit, used to detect strain data of a vehicle suspension;

[0006] A signal processing unit, used for processing strain data;

[0007] a computing unit, configured to determine force information of a vehicle suspension based on the processed strain data;

[0008] The network unit is used to synchronously convert the force information and send it to the chassis CAN network.

[0009] Furthermore, the main body structure includes a main connecting plate, a ball pin seat, a front connecting plate and a rear connecting plate, and the ball pin seat, the front connecting plate and the rear connecting plate are respectively fixed to the three sides of the main connecting plate. A ball pin is installed on the ball pin seat, and the ball pin is used to connect to the vehicle suspension steering knuckle. A first hinge is provided on the front connecting plate, and a second hinge is provided on the rear connecting plate. The first hinge and the second hinge are used for respectively rigidly connecting to the vehicle body.

[0010] Furthermore, the front connecting plate includes an integrally connected connecting section and an articulated sleeve, one end of the connecting section is fixed to the main connecting plate, the first hinge is installed in the articulated sleeve, and the axis of the articulated sleeve is parallel to the main connecting plate.

[0011] Furthermore, one end of the rear connecting plate is fixedly connected to the main connecting plate, and the other end is provided with a hinge hole, the second hinge is installed in the hinge hole, and the axis of the hinge hole is perpendicular to the main connecting plate.

[0012] Furthermore, the front connecting plate and the rear connecting plate are both provided with long waist-shaped holes, and the front connecting plate and the rear connecting plate can slide on the main connecting plate through the long waist-shaped holes to adjust the elongation.

[0013] Furthermore, the detection unit includes three ceramic piezoelectric chips and a strain sensor. The three ceramic piezoelectric chips are installed inside the ball pin seat and are arranged orthogonally to each other. The ceramic piezoelectric chips are used to measure the force transmitted to the ball pin seat by the ball pin; the strain sensor is installed on the front connecting plate, and the strain sensor is used to measure the strain force of the hinge sleeve on the front connecting plate that is sleeved with the first hinged part.

[0014] Furthermore, the signal processing unit includes a voltage acquisition module, a voltage amplification module, a current acquisition module and an analog-to-digital conversion module. The voltage acquisition module receives data measured by the ceramic piezoelectric chip, the voltage amplification module amplifies the data received by the voltage acquisition module, the current acquisition module receives data measured by the strain sensor, and the analog-to-digital conversion module performs analog-to-digital conversion on the data output by the voltage amplification module and the current acquisition module and sends it to the operation unit.

[0015] Furthermore, the operation unit includes a storage module, a micro-processing module and an IO interface. The storage unit receives and stores the data processed by the signal processing unit through the IO interface. The micro-processing module uses a transfer function to calculate the received data to obtain the force information of the vehicle suspension and outputs it to the network unit through the IO interface.

[0016] Furthermore, the network unit includes a clock synchronization module, a data receiving module, a data checking module, a data resampling module, a data compression module and a data sending module.

[0017] The clock synchronization module is used to synchronize the time between the chassis CAN network and the vehicle bus;

[0018] The data receiving module is used to receive data sent by the computing unit;

[0019] The data proofreading module is used to proofread the data of the data receiving module;

[0020] The data resampling module is used to configure the data collection frequency to the frequency required by the chassis domain system;

[0021] The data compression module is used to compress and package the data;

[0022] The data sending module is used to send the packaged data to the chassis CAN network.

[0023] A method for measuring the state of a vehicle-mounted suspension comprises installing a main structure with a detection unit between the vehicle suspension steering knuckle and the rigid body, detecting the strain data of the vehicle suspension through the detection unit, processing the strain data, determining the force information of the vehicle suspension based on the processed strain data, and synchronously converting the force information to send it to the chassis CAN network.

[0024] The beneficial effects of the present invention are:

[0025] The measurement device of the present invention uses a detection unit located on the main structure to obtain the local force and strain state of the suspension. The processing and calculation units process and calculate this data to obtain vehicle suspension force information. This information is then packaged and sent to the chassis network for access by the chassis domain control system. This device features a simple structure, rational design, convenient measurement, and strong versatility, resolving the issue of users being unable to obtain vehicle suspension force and displacement information. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the principle of the measuring device of the present invention.

[0027] Figure 2 It is a schematic diagram of the connection between the main structure of the present invention and the vehicle suspension.

[0028] Figure 3 Schematic diagram of the main structure of the present invention.

[0029] Figure 4 Schematic diagram of the installation of the piezoelectric chip of the present invention.

[0030] Figure 5 Schematic diagram of the installation of the strain sensor of the present invention.

[0031] In the figure, 1-main body structure; 1.1-main connecting plate; 1.2-ball pin seat; 1.3-front connecting plate; 1.31-connecting section; 1.32-hinge sleeve; 1.4-rear connecting plate; 1.41-hinge hole; 1.5-ball pin; 1.6-first hinge; 1.7-second hinge; 1.8-long waist hole; 2-detection unit; 2.1-ceramic piezoelectric chip; 2.2-strain sensor; 3-signal processing unit; 3.1-voltage acquisition module; 3.2-voltage amplification module; 3 .3-Current acquisition module; 3.4-Analog-to-digital conversion module; 4-Arithmetic unit; 4.1-Storage module; 4.2-Microprocessing module; 4.3-IO interface; 5-Network unit; 5.1-Clock synchronization module; 5.2-Data receiving module; 5.3-Data proofreading module; 5.4-Data resampling module; 5.5-Data compression module; 5.6-Data sending module; 6-Suspension steering knuckle; 7-Front bracket; 7.1-Front mounting point of triangle arm; 7.2-Rear mounting point of triangle arm. DETAILED DESCRIPTION

[0032] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0033] like Figure 1-5 As shown, the present invention provides a vehicle-mounted suspension state measuring device, which includes five parts, namely: a main body structure 1, a detection unit 2, a signal processing unit 3, an operation unit 4 and a network unit 5. The main body structure 1 is used to connect with the vehicle suspension steering knuckle 6 and the rigid body and is also used to install the detection unit 2. The rigid body refers to an assembly rigidly connected to the body, such as a frame assembly rigidly connected to the body, a bracket assembly rigidly fixed to the body, etc. The detection unit 2 is used to detect the strain data of the vehicle mechanism (suspension or bracket). The signal of the detection unit 2 is transmitted to the signal processing unit 3. The signal processing unit 3 processes the signal and converts the analog signal into a digital signal. The operation unit 4 receives the data of the signal processing unit and performs parameter calculation. Finally, the calculation result is transmitted to the vehicle network hub through the network unit 5.

[0034] In the above scheme, the main body structure 1 includes a main connecting plate 1.1, a ball pin seat 1.2, a front connecting plate 1.3, and a rear connecting plate 1.4. The main connecting plate 1.1 is a polygonal planar plate structure. The ball pin seat 1.2, the front connecting plate 1.3, and the rear connecting plate 1.4 are respectively fixed to the three sides of the main connecting plate 1.1 by bolts. The ball pin 1.5 is mounted on the ball pin seat 1.2, and the ball pin 1.5 is used to connect to the vehicle suspension knuckle 6. The front connecting plate 1.3 is provided with a first hinge 1.6, and the rear connecting plate 1.4 is provided with a second hinge 1.7. The first hinge 1.6 and the second hinge 1.7 are used to connect to the front mounting point 7.1 and the rear mounting point 7.2 of the vehicle's front bracket 7, respectively. The main body structure 1 is installed between the suspension knuckle 6 and the front bracket 7. The detection unit 2 on the main body structure 1 detects the force data of the suspension and the front bracket when the vehicle is running. The method is simple and easy to implement.

[0035] In the above solution, the front connecting plate 1.3 comprises an integrally connected connecting section 1.31 and an articulated sleeve 1.32. The connecting section 1.31 is an elongated strip, while the articulated sleeve 1.32 is a cylindrical structure. One end of the connecting section 1.31 is fixed to the main connecting plate 1. The first hinge 1.6 is mounted within the articulated sleeve 1.32, with the axis of the hole in the articulated sleeve 1.32 parallel to the main connecting plate 1. The rear connecting plate 1.4 is a planar plate-like structure, with one end fixedly connected to the main connecting plate 1 and the other end having an articulated hole 1.41. The second articulated member 1.7 is mounted within the articulated hole 1.41, with the axis of the articulated hole 1.41 perpendicular to the main connecting plate 1.

[0036] In the above solution, the front connecting plate 1.3 and the rear connecting plate 1.4 can be slidably adjusted on the main connecting plate 1 to adjust their extension. Specifically, long waist-shaped holes 1.8 can be provided on each of the front connecting plate 1.3 and the rear connecting plate 1.4 to adjust their extension to suit different vehicle models. Alternatively, long waist-shaped holes can be provided on the main connecting plate to adjust the extension of the front and rear connecting plates.

[0037] In the above scheme, the detection unit 2 includes three ceramic piezoelectric chips 2.1 and a three-axis strain sensor 2.2. The three ceramic piezoelectric chips 2.1 are installed inside the ball pin seat 1.2 and are arranged orthogonally to each other. The ceramic piezoelectric chips 2.1 are used to measure the force transmitted to the ball pin seat 1.2 by the ball pin 1.5. The ends of the ceramic piezoelectric chips 2.1 all protrude from the inner surface of the hole on the ball pin seat, which is convenient for contact with the ball pin and detecting the force it is subjected to. The piezoelectric chip will generate a voltage of 0.1mv to 1mv under the pressure of the ball pin, and the magnitude of the voltage is proportional to the pressure of the ball pin; the strain sensor 2.2 is installed on the hinged sleeve 1.32 on the front connecting plate 1.3. The strain sensor 2.2 is used to measure the strain force of the hinged sleeve 1.31 on the front connecting plate that is sleeved with the first hinged part 1.6, and transmit it to the signal processing unit 3 in the form of current.

[0038] In the above scheme, the signal processing unit 3 includes a voltage acquisition module 3.1, a voltage amplification module 3.2, a current acquisition module 3.3, and an analog-to-digital conversion module 3.4. The voltage acquisition module 3.1 receives data measured by the ceramic piezoelectric wafer 2.1, the voltage amplification module 3.2 amplifies the data received by the voltage acquisition module 3.1, the current acquisition module 3.3 receives data measured by the strain sensor 2.2, and the analog-to-digital conversion module 3.4 performs analog-to-digital conversion on the data output by the voltage amplification module 3.2 and the current acquisition module 3.3 and sends it to the operation unit 4. The signal processing unit has at least six groups of (positive and negative) input ports and six groups of output ports.

[0039] In the above scheme, the computing unit 4 includes a storage module 4.1, a microprocessor module 4.2, and an I / O interface 4.3. The storage module 4.1 includes a read-only memory (ROM) and a read-write memory (RAM). The ROM is used to load the computing program, and the RAM is used to temporarily store the computing process. The microprocessor module 4.2 is a microcomputer chip (CPU). The I / O interface 4.3 is used to communicate between input and output signals. The storage unit 4.1 receives and stores data processed by the signal processing unit 3 via the I / O interface 4.3. The microprocessor module 4.2 calculates the received data using a transfer function to obtain force information on the vehicle suspension and outputs it to the network unit 5 via the I / O interface 4.3. The microprocessor module 4.2 calculates the force and displacement information of the rigid vehicle body (such as the wheel center, swing arm, bracket attachment point, steering knuckle connection point, etc.).

[0040] The microprocessor module calculates the input shaft head piezoelectric ceramic voltage signal (U1, U2, U3), the articulation strain signal (εx, εy, εz) and the output wheel center force Fx, Fy, Fz in the form of a transfer function. F = f(u, ε). This functional relationship can be obtained through iteration using the MTS multi-channel endurance load device. The specific process is: the device is placed on the mts test equipment, the articulation position is fixed to the test bench by bolts, and a sinusoidal load Ft is applied to the three directions of the vehicle coordinates X, Y, and Z at the position of the ball pin. At the same time, the voltage signal Ut of the three piezoelectric sensors, the displacement Ut of the wheel center, and the signal εt of the three-dimensional strain measurement device are measured. The transfer function of the wheel center force and voltage signal is obtained through the z-transformation: G(s) = F(s) / U(s), F(s) and U(s) are the Laplace transforms of the force signal and voltage signal, respectively;

[0041] And the transfer function between the wheel center displacement Ut and the strain signal εt is: H(s) = U(s) / ε(s), where U(s) and ε(s) are the Laplace transforms of the displacement signal and the strain signal, respectively.

[0042] Using the same technical means, the force and displacement information of positions such as the swing arm, bracket attachment point, and steering knuckle connection point can be calculated. After the force signal and displacement signal of the wheel center are calculated, the data is packaged and sent to the chassis bus for call by the chassis domain control system.

[0043] In the above solution, the network unit 5 includes a clock synchronization module 5.1, a data receiving module 5.2, a data checking module 5.3, a data resampling module 5.4, a data compression module 5.5 and a data sending module 5.6.

[0044] The clock synchronization module 5.1 is used to synchronize the time between the chassis CAN network and the vehicle bus;

[0045] The data receiving module 5.2 is used to receive data sent by the computing unit;

[0046] The data proofreading module 5.3 is used to proofread the data of the data receiving module;

[0047] The data resampling module 5.4 is used to configure the data collection frequency to the frequency required by the chassis domain system. For example, some sampling frequencies require 100 Hz, while others require 200 Hz. Frequency configuration is performed in this module.

[0048] The data compression module 5.5 is used to compress and package the data;

[0049] The data sending module 5.6 is used to send the packaged data to the chassis CAN network.

[0050] The above solution also includes a power module for providing power to the detection unit, signal processing unit, computing unit, network unit, etc. The power module can be an independent device or a module installed in each unit.

[0051] The present invention also provides a method for measuring the state of a vehicle suspension, wherein a main body structure 1 with a detection unit 2 is installed between the vehicle suspension steering knuckle 6 and the front bracket 7, the detection unit 2 detects the strain data of the vehicle suspension, the signal processing unit 3 processes the strain data, the calculation unit 4 determines the force information of the vehicle suspension based on the processed strain data, and the network unit 5 synchronously converts the force information and sends it to the chassis CAN network. Among them, the composition structure and function of the main body structure 1, the detection unit 2, the signal processing unit 3, the calculation unit 4 and the network unit 5 are as described above and will not be repeated here. The present invention obtains the local force state and strain state of the suspension through the detection unit arranged on the main body structure, processes and calculates the detected data through the processing unit and the calculation unit, thereby obtaining the force information of the vehicle suspension, and packaging it and sending it to the chassis network for the chassis domain control system to call. The device has a simple structure, reasonable design, convenient measurement, and strong versatility, solving the problem of the user's vehicle suspension force and displacement information being unable to be obtained.

[0052] The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be covered by the scope of protection of the present invention. Matters not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A vehicle-mounted suspension state measuring device, characterized in that: include A main body structure (1) is used for connecting with the vehicle suspension and installing the detection unit; A detection unit (2), used for detecting strain data of a vehicle suspension; A signal processing unit (3) for processing strain data; A calculation unit (4) is used to determine the force information of the vehicle suspension based on the processed strain data; A network unit (5) is used to synchronously convert the force information and send it to the chassis CAN network; The main body structure (1) comprises a main connecting plate (1.1), a ball pin seat (1.2), a front connecting plate (1.3) and a rear connecting plate (1.4); the ball pin seat (1.2), the front connecting plate (1.3) and the rear connecting plate (1.4) are respectively fixed to three sides of the main connecting plate; a ball pin (1.5) is installed on the ball pin seat (1.2); the ball pin (1.5) is used to connect to a vehicle suspension steering knuckle (6); a first hinge (1.6) is provided on the front connecting plate (1.3); a second hinge (1.7) is provided on the rear connecting plate (1.4); the first hinge (1.6) and the second hinge (1.7) are used to connect to a rigid vehicle body respectively; The detection unit (2) comprises three ceramic piezoelectric chips (2.1) and a strain sensor (2.2). The three ceramic piezoelectric chips are mounted inside a ball pin seat (1.2) and are arranged orthogonally to each other. The ceramic piezoelectric chips (2.1) are used to measure the force transmitted from the ball pin to the ball pin seat. The strain sensor (2.2) is mounted on a front connecting plate. The strain sensor (2.2) is used to measure the strain force of an articulated sleeve on the front connecting plate that is sleeved with a first articulated member.

2. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: The front connecting plate (1.3) comprises an integrally connected connecting section (1.31) and an articulated sleeve (1.32); one end of the connecting section (1.31) is fixed to the main connecting plate; the first articulated member (1.6) is installed in the articulated sleeve (1.32); and the axis of the articulated sleeve is parallel to the main connecting plate.

3. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: One end of the rear connecting plate (1.4) is fixedly connected to the main connecting plate (1.1), and the other end is provided with a hinge hole (1.41). The second hinge member (1.7) is installed in the hinge hole, and the axis of the hinge hole is perpendicular to the main connecting plate.

4. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: The front connecting plate (1.3) and the rear connecting plate (1.4) are both provided with long waist-shaped holes (1.8), and the front connecting plate (1.3) and the rear connecting plate (1.4) can slide on the main connecting plate (1.1) through the long waist-shaped holes (1.8) to adjust the extension.

5. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: The signal processing unit (3) comprises a voltage acquisition module (3.1), a voltage amplification module (3.2), a current acquisition module (3.3) and an analog-to-digital conversion module (3.4); the voltage acquisition module (3.1) receives data measured by a ceramic piezoelectric chip; the voltage amplification module (3.2) amplifies the data acquired by the voltage acquisition module (3.1); the current acquisition module (3.3) receives data measured by a strain sensor; and the analog-to-digital conversion module (3.4) performs analog-to-digital conversion on the data output by the voltage amplification module (3.2) and the current acquisition module (3.3) and sends the data to the operation unit (4).

6. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: The operation unit (4) comprises a storage module (4.1), a micro-processing module (4.2) and an IO interface (4.3); the storage module (4.1) receives and stores data processed by the signal processing unit via the IO interface (4.3); the micro-processing module (4.2) calculates the received data using a transfer function to obtain force information of the vehicle suspension and outputs the calculated information to the network unit (5) via the IO interface (4.3).

7. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: The network unit (5) includes a clock synchronization module (5.1), a data receiving module (5.2), a data checking module (5.3), a data resampling module (5.4), a data compression module (5.5) and a data sending module (5.6). The clock synchronization module (5.1) is used to synchronize the time between the chassis CAN network and the vehicle bus; The data receiving module (5.2) is used to receive data sent by the computing unit; The data proofreading module (5.3) is used to proofread the data of the data receiving module; The data resampling module (5.4) is used to configure the data collection frequency to the frequency required by the chassis domain system; The data compression module (5.5) is used to compress and package the data; The data sending module (5.6) is used to send the packaged data to the chassis CAN network.

8. A method for measuring a vehicle-mounted suspension state based on the vehicle-mounted suspension state measuring device according to claim 1, characterized in that: A main body structure with a detection unit is installed between the vehicle suspension steering knuckle and the rigid body. The detection unit detects the strain data of the vehicle suspension, processes the strain data, determines the force information of the vehicle suspension based on the processed strain data, and synchronously converts the force information and sends it to the chassis CAN network.

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