Vehicle-mounted suspension state measuring device and method

Abstract

The invention discloses a vehicle-mounted suspension state measuring device and method. The device comprises a body structure which is used for being connected with a vehicle suspension and installing a detection unit; the detection unit is used for detecting strain data of the vehicle suspension; the signal processing unit is used for processing the strain data; the arithmetic unit is used for determining stress information of the vehicle suspension according to the processed strain data; and the network unit is used for synchronously converting the stress information and sending the stress information to a chassis CAN network. The local stress state and strain state of the suspension are obtained through the detection unit arranged on the body structure, detected data are processed and calculated through the processing unit and the arithmetic unit, and therefore stress information of the vehicle suspension is obtained, packaged and sent to a chassis network to be called by a chassis domain control system. The device is simple in structure, reasonable in design, convenient to measure and high in universality, and solves the problem that stress and displacement information of a vehicle suspension of a user cannot be acquired.

Description

Technical Field

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

[0002] The intelligent wire-controlled chassis needs to obtain the force state and suspension motion state data of the suspension, so as to obtain information such as the force on the vehicle and tires, the height of the vehicle's center of mass, etc., in order to evaluate the vehicle's driving environment. At present, the suspension state measurement is mainly measured by special equipment such as the wheel center six-component force collector and the pull-wire distance measurement tool. The six-component force data collector and the pull-wire displacement sensor are mainly used by automobile manufacturers for road spectrum data collection. Due to the complex structure of the device, it is not suitable for mass equipment on user vehicles. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of 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, used for connecting with the vehicle suspension and installing a detection unit;

[0005] A detection unit, used for detecting strain data of a vehicle suspension;

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

[0007] A calculation unit, used for determining force information of the vehicle suspension according to 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, wherein 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 arranged on the front connecting plate, and a second hinge is arranged on the rear connecting plate, and 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 strain sensors. 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 articulated 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 them to the operation unit.

[0015] Furthermore, the computing unit includes a storage module, a micro-processing module and an IO interface. The storage unit receives and stores data processed by the signal processing unit through the IO interface. The micro-processing module calculates the received data using a transfer function to obtain 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 checking module is used to check 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 suspension comprises installing a main body structure with a detection unit between a vehicle suspension steering knuckle and a rigid body, detecting strain data of the vehicle suspension through the detection unit, processing the strain data, determining force information of the vehicle suspension according to the processed strain data, and synchronously converting the force information and sending it to a chassis CAN network.

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

[0025] The measuring device of the present invention obtains the local stress 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 packs and sends it to the chassis network for the chassis domain control system to call. The device has a simple structure, reasonable design, convenient measurement, strong versatility, and solves the problem that the user's vehicle suspension force and displacement information cannot be obtained. 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 It is a schematic diagram of the main body structure of the present invention.

[0029] Figure 4 It is a schematic diagram of the installation of the piezoelectric chip of the present invention.

[0030] Figure 5 This is a 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-micro-processing 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 specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but 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 can 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 knuckle 6 and the rigid body and 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 connected to the body, etc.; the detection unit 2 is used to detect the strain data of the vehicle mechanism (suspension or bracket), and 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, and finally transmits the calculation result 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 installed on the ball pin seat 1.2. The ball pin 1.5 is used to connect with the vehicle suspension knuckle 6. The front connecting plate 1.3 is provided with a first hinge 1.6. 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 with the front mounting point 7.1 of the triangle arm and the rear mounting point 7.2 of the front bracket 7 of the vehicle. The main body structure 1 is installed between the suspension knuckle 6 and the front bracket 7. The force data of the suspension and the front bracket when the vehicle is running are detected by the detection unit 2 on the main body structure 1. The method is simple and easy to implement.

[0035] In the above scheme, the front connecting plate 1.3 includes an integrally connected connecting section 1.31 and an articulated sleeve 1.32, the connecting section 1.31 is a long strip structure, 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 installed in the articulated sleeve 1.32, and the axis of the hole of the articulated sleeve 1.32 is parallel to the main connecting plate 1. The rear connecting plate 1.4 is a flat plate structure, one end of the rear connecting plate 1.4 is fixedly connected to the main connecting plate 1, and the other end is provided with an articulated hole 1.41, the second articulated member 1.7 is installed in the articulated hole 1.41, and the axis of the articulated hole 1.41 is 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 slide on the main connecting plate 1 to adjust the elongation. Specifically, the front connecting plate 1.3 and the rear connecting plate 1.4 can be provided with long waist-shaped holes 1.8, and the elongation of the front connecting plate 1.3 and the rear connecting plate 1.4 can be adjusted through the long waist-shaped holes 1.8 to adapt to different vehicle models; the long waist-shaped holes can also be provided on the main connecting plate to adjust the elongation of the front connecting plate and the rear connecting plate.

[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 contacting with the ball pin and detecting its force. 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 member 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 chip 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 them to the operation unit 4. The signal processing unit has at least 6 groups (positive and negative) of input ports and 6 groups of output ports.

[0039] In the above scheme, the operation unit 4 includes a storage module 4.1, a micro-processing module 4.2 and an IO 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 calculation program, and the RAM is used for temporary storage of the calculation process. The micro-processing module 4.2 is a micro-computing chip CPU, and the I / O interface 4.3 is used to communicate with input signals and output signals. The storage unit 4.1 receives and stores the data processed by the signal processing unit 3 through the IO interface 4.3. The micro-processing module 4.2 calculates the received data in the form of a transfer function to obtain the force information of the vehicle suspension and outputs it to the network unit 5 through the IO interface 4.3. After calculation, the micro-processing module 4.2 can obtain the force and displacement information of the rigid 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 hinge strain signal (εx, εy, εz) and the output wheel center force Fx, Fy, Fz in the form of transfer function. F = f(u, ε). This functional relationship can be obtained through iteration through the MTS multi-channel endurance load device. The specific process is: the device is placed on the mts test equipment, the hinge position is fixed to the test bench by bolts, and the sinusoidal wave load Ft in the three directions of the vehicle coordinates X, Y, and Z is applied 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-way strain measurement device are measured. The transfer function of the wheel center force and voltage signal is obtained through z transformation: G(s) = F(s) / U(s), F(s) and U(s) are the Laplace transforms of the force signal and the 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 the swing arm, bracket attachment point, steering knuckle connection point and other positions 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 the chassis domain control system to call.

[0043] In the above scheme, 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 checking module 5.3 is used to check 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. The 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 provided 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 a vehicle suspension knuckle 6 and a front bracket 7, the strain data of the vehicle suspension is detected by the detection unit 2, the strain data is processed by the signal processing unit 3, the operation unit 4 determines the force information of the vehicle suspension according to 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 operation unit 4 and the network unit 5 are as described above, and are not described repeatedly 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, and 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 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 force and displacement information of the user's vehicle suspension cannot be obtained.

[0052] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A vehicle-mounted suspension state measuring device, characterized in that: include The main body structure (1) is used to connect with the vehicle suspension and install the detection unit; A detection unit (2), used for detecting strain data of a vehicle suspension; A signal processing unit (3), used for processing strain data; A calculation unit (4), used for determining the force information of the vehicle suspension according to the processed strain data; The network unit (5) is used for synchronously converting the force information and sending it to the chassis CAN network.

2. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: 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 with a vehicle suspension knuckle (6); a first hinge (1.6) is arranged on the front connecting plate (1.3); a second hinge (1.7) is arranged on the rear connecting plate (1.4); the first hinge (1.6) and the second hinge (1.7) are used to connect with a rigid vehicle body respectively.

3. The vehicle-mounted suspension state measuring device according to claim 2 is 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.

4. The vehicle-mounted suspension state measuring device according to claim 2, characterized in that: One end of the rear connection plate (1.4) is fixedly connected to the main connection plate (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 connection plate.

5. The vehicle-mounted suspension state measuring device according to claim 2, 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 elongation.

6. The vehicle-mounted suspension state measuring device according to claim 2, characterized in that: 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; and 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.

7. 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 collected 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).

8. 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 unit (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 information to the network unit (5) via the IO interface (4.3).

9. The vehicle-mounted suspension state measuring device according to claim 1, characterized in that: The network unit (5) comprises 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 checking module (5.3) is used to check 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.

10. A method for measuring the state of a vehicle suspension, 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 according to the processed strain data, and synchronously converts the force information and sends it to the chassis CAN network.

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