阅读说明：本技术 一种卡车行车抖动检测装置 (Truck driving shake detection device ) 是由 何海浪 史季青 黄森 任国涛 于 2020-06-01 设计创作，主要内容包括：本发明涉及一种卡车行车抖动检测装置,包括检测装置、抖动模拟装置和多个车轮驱动装置；所述抖动模拟装置包括实验平台和设置在实验平台上的多个举升装置,多个举升装置与试验车辆固定连接；所述检测装置包括车架抖动检测装置和车轮径向跳动检测装置；所述车架抖动检测装置包括振动检测分析仪和与振动检测分析仪电连接的转速振动传感器和多个加速度振动传感器,多个加速度振动传感器分别设置于驾驶室悬置、前桥、后桥和传动轴上,转速振动传感器设置于发动机机壳上,本申请具有检测分析车辆抖动原因的功能。(The invention relates to a truck driving jitter detection device, which comprises a detection device, a jitter simulation device and a plurality of wheel driving devices, wherein the detection device comprises a plurality of wheel driving devices; the shaking simulation device comprises an experiment platform and a plurality of lifting devices arranged on the experiment platform, and the plurality of lifting devices are fixedly connected with the test vehicle; the detection device comprises a frame shake detection device and a wheel radial run-out detection device; frame shake detection device includes vibration detection analysis appearance and the rotational speed vibration sensor and a plurality of acceleration vibration sensor of being connected with vibration detection analysis appearance electricity, and a plurality of acceleration vibration sensors set up respectively on driver's cabin suspension, front axle, rear axle and transmission shaft, and rotational speed vibration sensor sets up on engine housing, and this application has the function of detection and analysis vehicle shake reason.)

1. The utility model provides a truck driving shake detection device which characterized in that: the device comprises a detection device, a shake simulation device and a plurality of wheel driving devices;

the shaking simulation device comprises an experiment platform and a plurality of lifting devices arranged on the experiment platform, and the plurality of lifting devices are fixedly connected with the test vehicle;

the detection device comprises a frame shake detection device and a wheel radial run-out detection device;

the vehicle frame shake detection device comprises a vibration detection analyzer, a rotating speed vibration sensor and a plurality of acceleration vibration sensors, wherein the rotating speed vibration sensor and the acceleration vibration sensors are electrically connected with the vibration detection analyzer, the acceleration vibration sensors are respectively arranged on a cab suspension, a front axle, a rear axle and a transmission shaft, and the rotating speed vibration sensors are arranged on an engine shell.

2. The truck driving jitter detection device of claim 1, wherein: lifting fixtures are fixedly arranged on the lifting devices and detachably and fixedly connected with the vehicle.

3. The truck driving jitter detection device of claim 1, wherein: the wheel driving device comprises a driving motor and a driving wheel arranged on a driving shaft of the driving motor, and a height adjusting device is arranged between the driving motor and the experiment platform.

4. The truck driving jitter detection device of claim 1, wherein: the wheel radial runout detection device comprises a contact wheel, a displacement sensor and a telescopic rod arranged between the contact wheel and the displacement sensor, wherein the telescopic rod is fixedly arranged on an experiment platform.

5. The truck driving jitter detection device of claim 1, wherein: the wheel radial run-out detection device comprises a first laser displacement sensor and a second laser displacement sensor, wherein the first laser displacement sensor is vertically arranged, and the second laser displacement sensor is horizontally arranged.

6. The truck driving jitter detection device of claim 1, wherein: the experiment platform is provided with a plurality of dovetail grooves, and the lifting device is provided with a base corresponding to the dovetail grooves.

7. The truck driving jitter detection device of claim 3, wherein: the height adjusting device comprises a supporting rod, one end of the supporting rod is hinged to the experiment platform, the other end of the supporting rod is fixedly connected with the driving motor, and a fixing device is arranged between the supporting rod and the experiment platform.

Technical Field

The invention relates to the technical field of automobile NVH, in particular to a truck driving jitter detection device.

Background

NVH performance of a truck is one of important indexes concerned by customers, the riding comfort is reduced due to the shaking problem of a whole truck, how to efficiently solve the shaking problem of the whole truck during running is a difficult problem faced by current engineers, the previous diagnosis for the shaking problem during running is mostly based on subjective evaluation and experience, a sample piece is replaced in frequent road tests, blindness and uncertainty exist in the process of solving the shaking problem, the road tests are often long in period, more interference is caused to other introduced matters, the diagnosis and reason search for the shaking problem are inaccurate, and the period for solving the problem is long.

Disclosure of Invention

In order to solve the above problems in the background art, the present invention provides a truck driving shake detection apparatus having a function of detecting and analyzing a cause of vehicle shake.

The invention is realized by the following technical scheme:

a truck driving shake detection device comprises a detection device, a shake simulation device and a plurality of wheel driving devices;

the shaking simulation device comprises an experiment platform and a plurality of lifting devices arranged on the experiment platform, and the plurality of lifting devices are fixedly connected with the test vehicle;

the detection device comprises a frame shake detection device and a wheel radial run-out detection device;

the vehicle frame shake detection device comprises a vibration detection analyzer and a plurality of acceleration vibration sensors electrically connected with the vibration detection analyzer, wherein the acceleration vibration sensors are respectively arranged on a cab suspension, a front axle, a rear axle, an engine shell and a transmission shaft.

As a further description of the invention: lifting fixtures are fixedly arranged on the lifting devices and detachably and fixedly connected with the vehicle.

As a further description of the invention: the wheel driving device comprises a driving motor and a driving wheel arranged on a driving shaft of the driving motor, and a height adjusting device is arranged between the driving motor and the experiment platform.

As a further description of the invention: the wheel radial runout detection device comprises a contact wheel, a displacement sensor and a telescopic rod arranged between the contact wheel and the displacement sensor, wherein the telescopic rod is fixedly arranged on an experiment platform.

As a further description of the invention: the wheel radial run-out detection device comprises a first laser displacement sensor and a second displacement sensor, wherein the first laser displacement sensor is vertically arranged, and the second displacement sensor is horizontally arranged.

As a further description of the invention: the experiment platform is provided with a plurality of dovetail grooves, and the lifting device is provided with a base corresponding to the dovetail grooves.

As a further description of the invention: the height adjusting device comprises a supporting rod, one end of the supporting rod is hinged to the experiment platform, the other end of the supporting rod is fixedly connected with the driving motor, and a fixing device is arranged between the supporting rod and the experiment platform.

Compared with the prior art, the invention has the following beneficial technical effects:

1. when the device is used for carrying out a detection test, a plurality of lifting devices are utilized to lead the front wheels of the vehicle to be grounded and fixed, and the rear wheels to be suspended, so as to start the detection test on the vehicle; for the artificial subjective judgment that the vehicle does not shake, determining that the running shake is not directly related to a transmission system and a rear axle driving part, directly utilizing a frame shake detection device to detect the frame shake of the vehicle, and further detecting the cause of the vehicle shake through the frame shake detection device; if the vehicle is judged to have shake by human subjectivity, the wheel radial run-out device is used for detecting the wheel radial run-out of the vehicle, and the vehicle radial run-out detection device is used for further detecting the cause of the vehicle shake; in the two detection processes, vehicle shaking data are acquired by the corresponding acceleration vibration sensors and are transmitted to the vibration detection analyzer, so that shaking reasons of the vehicle are detected and analyzed step by step, and finally the shaking reasons of the vehicle are found out.

2. The positioning platform is provided with a plurality of dovetail grooves which are in sliding clamping connection with the base of the lifting device, the base can be arranged in different dovetail grooves according to the sizes of different vehicles, and the lifting device can slide in the same dovetail groove, so that the applicability of the device is improved.

Drawings

FIG. 1 is a schematic view of a portion of the structure of the present invention;

FIG. 2 is a schematic view of the front axle and the lifting device of the present invention;

FIG. 3 is a schematic view of the rear axle of the present invention connected to a lifting device;

FIG. 4 is a schematic view of the wheel runout detecting apparatus of the present invention configured as a contact type displacement sensor;

FIG. 5 is a schematic view of a wheel drive apparatus according to the present invention;

fig. 6 is a schematic view of a wheel radial runout detecting apparatus according to the present invention, which is configured as a laser displacement non-contact type sensor.

Description of the reference numerals

1. A detection device; 11. a vehicle frame shake detection device; 111. a vibration analyzer; 112. an acceleration vibration sensor; 12. a wheel runout detecting device; 121. a contact wheel; 122. a displacement sensor; 123. a telescopic rod; 124. a first laser displacement sensor; 125. a second laser displacement sensor; 21. an experimental platform; 211. a dovetail groove; 22. a lifting device; 221. lifting the clamp; 3. a wheel driving device.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 5, a truck driving shake detection device includes a detection device, a shake simulation device, and a plurality of wheel drive devices.

The shaking simulation device comprises an experiment platform and a plurality of lifting devices arranged on the experiment platform, and the plurality of lifting devices are fixedly connected with the test vehicle. The lifting device is fixedly provided with a lifting clamp which is detachably and fixedly connected with the vehicle. A plurality of dovetail grooves are formed in the positioning platform, and bases are arranged on the lifting device corresponding to the dovetail grooves. Specifically, the plurality of dovetail grooves are parallel to each other, four lifting devices are arranged, and two lifting devices are in a group and are positioned in the same dovetail groove.

The detection device comprises a frame shake detection device, the frame shake detection device comprises a vibration detection analyzer and a plurality of acceleration vibration sensors electrically connected with the vibration detection analyzer, and the acceleration vibration sensors are respectively arranged on a cab suspension, a front axle, a rear axle, an engine shell and a transmission shaft. Specifically, two front suspension parts of a cab are respectively provided with an acceleration vibration sensor, two rear suspension parts of the cab are respectively provided with an acceleration vibration sensor, the left end and the right end of a front axle are respectively provided with an acceleration vibration sensor, the left end and the right end of a rear axle are respectively provided with an acceleration vibration sensor, and an engine shell and a transmission shaft hook are respectively provided with an acceleration vibration sensor.

The detection device further comprises a wheel radial runout detection device, the wheel radial runout detection device is arranged to be a contact type displacement sensor and comprises a contact wheel, a displacement sensor and a telescopic rod arranged between the contact wheel and the displacement sensor, and the telescopic rod is fixedly arranged on the ground. Or the wheel radial run-out detection device is a laser displacement non-contact sensor and comprises a first laser displacement sensor which is vertically arranged and a second laser displacement sensor which is horizontally arranged. Specifically, two decorative patterns in the middle of the contact wheel butt car tire tread when using, produced displacement will transmit displacement sensor when the wheel shakes, and the telescopic link is the type that resets by oneself.

The wheel driving device comprises a driving motor and a driving wheel arranged on a driving shaft of the driving motor, and the driving motor and the experiment platform are provided with height adjusting devices. The wheel driving device comprises a driving motor and a driving wheel arranged on a driving shaft of the driving motor, and the driving motor and the experiment platform are provided with height adjusting devices.

The specific implementation manner of this embodiment: a method for detecting the running shake of a truck,

s1: arranging test points, and arranging information acquisition at the test points of the vehicle; specifically, acceleration sensors are arranged on the left end and the right end of a front shaft of the truck, a cab suspension, the left side and the right side of a rear axle, a transmission shaft hanger, a transmission and an engine, and a rotating speed sensor is arranged on a flywheel shell.

S2: mounting a vehicle frame, and mounting a vehicle to the testing device; after the front wheel positioning parameters are ensured to meet the design requirements, the front axle and the rear axle of the vehicle are lifted by utilizing the lifting device, the wheel driving device is in contact with the vehicle, the motor of the wheel driving device does not work, the vehicle is started by a driver, the test hot car is carried out for 2 minutes, and the deformation of the stationary wheels is eliminated.

S3: the test working condition is used for testing the vehicle shaking, and the test working condition comprises the following steps:

s31, vehicle frame shaking subjective detection, and vehicle shaking state is judged by human subjectivity; specifically, for a jittering vehicle, a lifting device is utilized to lift a rear wheel about 3cm away from the ground, a front wheel is grounded and fixed, the vehicle is started, for the vehicle with the shaking phenomenon, the gear where the shaking phenomenon is located is fixed, for the new vehicle which is off-line, a direct gear and an overdrive gear are selected, the vehicle is tested at a constant speed of 30km/h, 40km/h, 50km/h, 60km/h, 70km/h, 80km/h, 90km/h and 100km/h respectively, each vehicle speed is kept for 15s, vibration data is recorded, a driver carries out synchronous subjective evaluation on the shaking in the vehicle, if there is no shudder at each vehicle speed, it can be determined that the travel vehicle speed shudder has no direct relationship to the drive train and rear drive section, then, the vehicle shake is objectively determined in S32, and if there is a shake, the cause of the vehicle shake is detected in S33.

S32, the objective detection of vehicle shaking is carried out when the vehicle does not shake, and the method comprises the following steps:

s321, detecting radial runout of the front wheel; testing the radial run-out value of the front wheel of the vehicle, and acquiring and outputting data A1; specifically, the whole vehicle is lifted by the lifting device, the ground clearance of the wheels is ensured to be equal, the radial runout of the left wheel and the right wheel of the front wheel is detected by the displacement sensor, the displacement sensor is ensured to be vertical to the tread of the vehicle, the wheels are rotated at a constant speed, 2 patterns in the middle of the tread of the vehicle are measured, the rotation of the wheel is not less than 5 circles each time, and the displacement sensor can be a contact type sensor or a laser displacement non-contact type sensor.

S322, independently detecting the shaking of the front wheel, respectively testing the shaking states of the left front wheel and the right front wheel during rotation, and acquiring and outputting data A2; specifically, the whole vehicle is lifted by using a lifting device, an engine does not work, a transmission is in neutral gear, a wheel driving device is used for rotating a left front wheel firstly, a right front wheel is static, and the vehicle is accelerated uniformly according to 0-10 m/s; collecting vibration signals by using an acceleration sensor on the left side of a front axle, rotating a right front wheel, keeping the left front wheel static, and accelerating according to uniform acceleration; and acquiring a vibration signal by using an acceleration sensor on the right side of the front axle.

S323, integrally detecting the shaking of the front wheels, and acquiring and outputting data A3 in the integral shaking state of the left front wheel and the right front wheel during driving; specifically, the whole vehicle is lifted by a lifting device, and the left front wheel and the right front wheel of the front axle are rotated at the same time and rotate at the rotating speed of 0-10 m/s; and acquiring vibration signals by using acceleration sensors on the left side and the right side of the front axle.

S33, vehicle shaking, and vehicle shaking reason detection, wherein the method comprises the following steps:

s331, engine shake elimination detection, suspension of a rear wheel, slow acceleration of an engine from an idle speed to a rated engine speed, and collection and output of data B, wherein the data B comprises cab suspension vibration data B1, transmission shaft suspension vibration data B2, flywheel angular acceleration data B3 and rear axle left and right wheel data B4; specifically, for a jittering vehicle, a rear wheel is lifted by a lifting device, the ground clearance is about 3cm, a front wheel is grounded and fixed, the vehicle is started, the transmission is in a gear, the engine is slowly accelerated from an idle speed to a rated engine speed, and cab suspension vibration data b1, transmission shaft suspension vibration data b2, flywheel angular acceleration data b3 and rear axle left and right wheel data b4 are acquired by corresponding measuring points.

S332, vibration elimination detection of a transmission shaft, after the engine slowly accelerates from an idle speed to the rated rotation speed of the engine, the engine slides in a neutral gear, and data C are collected and output, wherein the data C comprise suspension vibration data C1 of a cab of the vehicle, hanging vibration data C2 of the transmission shaft and vibration data C3 of left and right wheels of a rear axle; specifically, the rear wheel of a jittering vehicle is lifted by a lifting device, the ground clearance is about 3cm, the front wheel is grounded and fixed, the vehicle is started, the transmission is in a gear, the engine slowly accelerates from an idle speed to a rated engine speed, then slides in a neutral gear, and suspension vibration data c1 of a vehicle cab, hanging vibration data c2 of a transmission shaft and vibration data c3 of left and right rear axle wheels are collected by corresponding measuring points.

S333, detecting the radial runout of the rear wheel and acquiring the runout data D of the rear wheel; specifically, a rear wheel is lifted by a lifting device for a vehicle which shakes, the ground clearance is about 3cm, a transmission is in a neutral gear, an engine does not work, a front wheel is grounded and fixed, the ground clearance of the wheels is guaranteed to be equal, radial jumping quantity of left and right wheels of the rear wheel is detected by using a displacement sensor, rear wheel jumping data D is collected, the displacement sensor is guaranteed to be perpendicular to a tire tread of the vehicle, the wheels are rotated at a constant speed, 2 patterns in the middle of the tire tread of the vehicle are measured, at least 5 circles of rotation of the wheels are measured every time, and the displacement sensor can be a contact type displacement sensor or a laser displacement non-contact type sensor.

S4: data statistics and evaluation analysis, and data processing and analysis to obtain the shaking reason, wherein the data processing and evaluation analysis comprises the following steps:

s41, objectively judging vehicle shaking, processing A1, A2 and A3 to obtain an objective shaking detection value a, wherein the objective shaking detection value a does not exceed the standard, the vehicle is qualified, the objective shaking detection value a exceeds the standard, and S32 is repeatedly carried out after replacing unqualified parts; specifically, the RMS of a1, a2 and A3 are counted to obtain a vehicle speed and vibration magnitude curve, namely an objective jitter detection value a, and the vehicle with the vehicle speed and vibration magnitude curve at a preset threshold is objectively judged to be that the whole vehicle is not jittered.

S42, vehicle shake detection, wherein the method for detecting the vehicle shake reason for the shaken vehicle comprises the following steps:

s421, processing data, namely processing the data B to respectively obtain comparison detection data B1 and B2, wherein both B1 and B2 exceed standards, processing B4 and B2 to obtain rear wheel shaking data f, wherein the shaking data f exceed the standards, performing rear wheel shaking correction, processing data D to calculate the radial jump amount D, and performing drive train shaking analysis if the shaking data f do not exceed the standards; specifically, acceleration waterfall graphs of acceleration, rotating speed and vibration of B4, B2, c4 and c2 are drawn, correlation data B1 and B2, B1 and B2 of acceleration of a suspension position of a cab and acceleration of a hanging measuring point of a rear axle and a transmission shaft in engine shake elimination detection and transmission shaft elimination detection are respectively solved, the 1, 2 and 3 orders of wheels of the left and right acceleration waterfall graphs of B4 and the 1 and 2 orders of B2 are judged, and if the 1, 2 and 3 orders of B4 exceed a preset threshold value, the wheels shake;

carrying out rear wheel correction, carrying out filtering processing on acceleration signals in X, Y, Z directions on the left side and the right side of b4, keeping the acceleration signals within 40Hz of low frequency, carrying out acceleration integration processing to obtain displacement signals, obtaining the magnitude of 1, 2 and 3 orders of a displacement spectrogram, solving the dynamic unbalance amount through 1-order vibration data processing of the wheel, judging whether the unbalance exceeds the standard or not, and correcting the dynamic balance of the wheel assembly if the unbalance exceeds the standard;

processing data D to calculate a radial runout amount D, filtering displacement signals X and Z-direction displacement signals tested by laser displacement and synthesizing an axis track to obtain the length a and the width b of the track, filtering displacement signals tested by contact and EMD empirical mode decomposition, combining to obtain Z-direction 2-order displacement vibration curves C1 and C2 around b4 to obtain fluctuation amounts delta C1 and delta C2, and judging whether the radial runout exceeds the standard or not according to the D value (formula-1) of the radial runout amount; if the standard exceeds the standard, the wheel assembly is replaced or the radial jump is corrected

The driveline jerk analysis includes:

s4211, c3 exceeds the standard, the engine suspension shakes, c2 exceeds the standard, the transmission shaft shakes, and c2 does not exceed the standard, and S4212 is carried out; specifically, if c3 exceeds the standard, the suspension stiffness of the engine is adjusted; c2, if the vehicle speed exceeds the standard, checking the dynamic balance and the included angle of the transmission shaft, and if the peak values of 1 step and 2 step of the transmission shaft exist at a certain vehicle speed, judging that the vibration is caused by the transmission shaft.

S4212, processing c3 to obtain c31, shaking the transmission system and shaking the cab when c31 exceeds the standard, wherein c31 does not exceed the standard; specifically, c3 is processed to obtain a vibration curve c31 of the flywheel rotation speed fluctuation and the vehicle speed, c31 exceeds a preset threshold value, the transmission system shakes, c31 does not exceed the preset threshold value, and the cab shakes.

S4222 is carried out when S422 and B1 exceed the standard and B2 does not exceed the standard; specifically, B1 is greater than 0.8, and B2 is less than 0.8, and step S4222 is performed.

S423, B1 and B2 do not exceed the standard, and the cab shakes; specifically, both B1 and B2 were less than 0.8, cab flutter.

The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.