Search

CN-115508110-B - Shaft coupling dynamometer and whole vehicle testing method

CN115508110BCN 115508110 BCN115508110 BCN 115508110BCN-115508110-B

Abstract

The invention discloses a shaft coupling dynamometer and a whole vehicle testing method, the shaft coupling dynamometer comprises a rack, the dynamometer is arranged on the rack, the dynamometer is connected with a hub wheel shaft of a tested vehicle through a connecting flange and used for transmitting rotation of the hub wheel shaft of the tested vehicle into the dynamometer, a steering load system used for applying load force to steering operation and correcting operation of the tested vehicle is arranged on the rack, the steering load system is provided with a directional wheel mechanism, an axis of a directional wheel in the directional wheel mechanism is positioned on a vertical middle plane of the dynamometer, the vertical middle plane of the dynamometer is a plane along the vertical direction and passing through the axis of the connecting flange, and in the steering process of the tested vehicle, a motion track of the directional wheel mechanism of the shaft coupling dynamometer is a circular arc track, and the circle center of the steering motion track of the hub. The shaft coupling dynamometer disclosed by the invention overcomes the limitation of site conditions and improves the testing effect.

Inventors

  • ZHU ENPENG
  • WANG ZHUO
  • WANG LEI

Assignees

  • 北京经纬恒润科技股份有限公司

Dates

Publication Date
20260505
Application Date
20221027

Claims (9)

  1. 1. A method for testing a whole vehicle is characterized by comprising a shaft coupling dynamometer, a measurement and control system and a simulation system, Wherein, the axle coupling dynamometer includes: a stand (2); The power measuring machine (1) is arranged on the rack (2), and the power measuring machine (1) is connected with a hub axle of a tested vehicle through a connecting flange and is used for transmitting the rotation of the hub axle of the tested vehicle into the power measuring machine (1); A steering load system (3) for applying a load force to a steering operation and a return operation of the vehicle under test, the steering load system (3) being provided on the stand (2); The steering load system (3) is provided with a directional wheel mechanism (11), an axis (a) of a directional wheel (112) in the directional wheel mechanism (11) is positioned on a vertical middle plane of the dynamometer (1), the vertical middle plane of the dynamometer is a plane along a vertical direction and passing through an axis (b) of the connecting flange (6), and in the steering process of the tested vehicle, the motion track of the directional wheel mechanism (11) of the shaft coupling dynamometer is an arc track, and the circle center of the motion track is the circle center of the steering motion track of the hub; the measurement and control system is provided with a measurement unit and a control unit; The simulation system is in communication connection with the measurement and control system, the simulation system can formulate control parameters according to the parameters measured by the measurement unit and transmit the control parameters to the control unit, and the control unit controls the operation of the dynamometer and the steering load system according to the control parameters, wherein the shaft coupling dynamometer is provided with at least one, and at least one shaft coupling dynamometer is in communication connection with one measurement and control system and one simulation system; Wherein, include: Obtaining the aligning moment of the tested vehicle according to the vehicle parameters of the tested vehicle, wherein the vehicle parameters at least comprise the mass, the track, the tire, the vehicle speed and the steering angle of the vehicle; Determining driving force required by a steering load system according to dynamometer parameters of the shaft-coupled dynamometer, wherein the dynamometer parameters at least comprise the mass of the dynamometer, the friction resistance of the dynamometer and the aligning moment of the tested vehicle, and the friction resistance of the dynamometer at least comprises the friction resistance of a front wheel (8) of the shaft-coupled dynamometer and the ground and the friction resistance of a directional wheel (112) and the ground; calculating the driving force required to be provided by a directional wheel driving device (12) of the shaft coupling dynamometer according to the driving force required by a steering load system, the transmission ratio of a synchronous connecting device (13) and the diameter of a directional wheel (112); And the driving force is transmitted to the directional wheel mechanism (11) through the synchronous connecting device (13), so that the shaft coupling dynamometer is driven to be aligned with the steering system of the tested vehicle.
  2. 2. The whole vehicle testing method according to claim 1, wherein the synchronous connection device (13) is located between the directional wheel drive device (12) and the directional wheel mechanism (11); the driving end of the directional wheel driving device (12) is connected with the power input end of the synchronous connecting device (13), and the power output end of the synchronous connecting device (13) is connected with the directional wheel mechanism (11); the directional wheel driving device (12) provides a load force for the directional wheel (112) of the directional wheel mechanism (11) through the synchronous connecting device (13), and the load force is used as a force for driving the hub wheel shaft of the tested vehicle to rotate and return to the normal position by the shaft coupling dynamometer.
  3. 3. The vehicle testing method of claim 2, wherein the synchronous connection means (13) Comprises a first synchronous wheel (131), a second synchronous wheel (132) and a transmission part (133); the driving end of the directional wheel driving device (12) is connected with the first synchronous wheel (131), and the central line of the driving end is coincident with the axis of the first synchronous wheel (131); The directional wheel (112) of the directional wheel mechanism (11) is connected with the second synchronous wheel (132), and the axis of the directional wheel (112) is coincident with the axis of the second synchronous wheel (132); The transmission part (133) is connected with the first synchronous wheel (131) and the second synchronous wheel (132), and the first synchronous wheel (131) and the second synchronous wheel (132) synchronously rotate through the connection of the transmission part (133).
  4. 4. The whole vehicle testing method according to claim 3, wherein the orientation wheel mechanism (11) further comprises an orientation wheel mounting frame (111) and a wheel shaft (113), and the orientation wheel (112) is rotatably arranged on the orientation wheel mounting frame (111) through the wheel shaft (113); The directional wheel (112) is provided with a rotating shaft mounting hole, and the wheel shaft (113) penetrates through the rotating shaft mounting hole and is in circumferential positioning connection with the directional wheel (112); The directional wheel mounting frame (111) is provided with a wheel shaft supporting hole, and the wheel shaft (113) is rotatably arranged in the wheel shaft supporting hole; The directional wheel mounting frame (111) is connected with the rack (2).
  5. 5. The whole vehicle testing method according to claim 1, wherein the bench (2) comprises: The support frame (7), the support frame (7) includes first support portion (71) and second support portion (72), first support portion (71) with second support portion (72) are articulated, second support portion (72) are provided with stand (73), dynamometer machine (1) set up in first support portion (71) or on second support portion (72), turn to load system (3) with first support portion (71) or second support portion (72) are connected; the shock absorber (9) is provided with a first connecting end and a second connecting end, the first connecting end is hinged with the first bracket part (71), the second connecting end is hinged with the upright post (73), and the shock absorber (9) realizes shock absorption through expansion and contraction of the shock absorber and is used for absorbing shock of the whole shaft coupling dynamometer; the roller is used for moving the rack (2) and is rotatably arranged at the bottom of the supporting frame (7); the number of the rollers is multiple, the rollers are provided with front wheels (8) close to the connecting flange (6) and rear wheels (16) close to the directional wheel mechanism (11), and the rear wheels (16) are universal wheels.
  6. 6. The whole vehicle testing method according to claim 5, further comprising a lifting mechanism (10) for lifting the rear wheel (16); The lifting mechanism (10) is arranged on one side of the rack (2) close to the directional wheel mechanism (11); The number of the lifting mechanisms (10) is two, and the lifting mechanisms are symmetrically arranged at two sides of the directional wheel mechanism (11); the lifting mechanism (10) comprises a lifting mounting seat (14) and a lifting driving device (15), the rear wheel (16) is connected with the lifting end of the lifting driving device (15), the main body structure of the lifting driving device (15) is connected with the lifting mounting seat (14), and the lifting mounting seat (14) is connected with the rack (2); the rear wheels (16) of the two lifting mechanisms (10) are equidistant from the axes of the directional wheel mechanisms (11).
  7. 7. The whole vehicle testing method according to claim 6, wherein the top surface of the lifting mounting seat (14) is connected with the main body structure of the lifting driving device (15); the lifting mounting seat (14) is provided with an avoidance through hole for the driving end of the lifting driving device (15) to pass through; The rear wheel (16) is positioned on one side of the lifting installation seat (14) back to the main body structure of the lifting driving device (15), and a wheel frame of the rear wheel (16) is fixedly connected with the driving end of the lifting driving device (15); The driving handle of the lifting driving device (15) drives the driving end of the lifting driving device (15) to move up and down along the direction vertical to the top surface of the lifting mounting seat (14) and drive the rear wheel (16) to move up and down.
  8. 8. The vehicle testing method of claim 6, wherein the front wheel (8) is located at a first bracket portion (71), and the rear wheel (16) and the lifting mechanism (10) are located at a second bracket portion (72).
  9. 9. The method for testing a complete vehicle according to claim 4, The directional wheel mechanism (11) further comprises a bearing (114), a gasket (116) and a tightening nut (115); The outer wall of the outer ring of the bearing (114) is connected with the hole wall of the wheel shaft supporting hole of the directional wheel mounting frame (111) in a matching way, and the inner wall of the inner ring of the bearing (114) is connected with the inner wall of the wheel shaft (113) in a matching way; The wheel axle (113) is provided with a shaft shoulder, one surface of the gasket (116) is in matched contact with the shaft shoulder, and the other surface of the gasket (116) is in contact with the end surface of the bearing; The directional wheel (112) and the second synchronous wheel (132) are sleeved on the wheel shaft (113), and two ends of the wheel shaft (113) are respectively locked through the tightening nuts (115).

Description

Shaft coupling dynamometer and whole vehicle testing method Technical Field The invention relates to the technical field of vehicle detection equipment, in particular to a shaft coupling dynamometer and a whole vehicle testing method. Background The real vehicle test can be used for verifying various performances of the whole vehicle and related parts, and can also be used for verifying whether the vehicle reaches the original design target. Conventional real vehicle power testing is performed using chassis dynamometers or rotary drum test benches. But can not really overcome the defects of chassis dynamometers, such as the problems of site requirements, larger experimental errors, incapability of realizing steering and the like. The traditional chassis dynamometer is complex to install, special decoration is needed for a test site, a vehicle steering process cannot be tested, a rotary drum test bed does not need to put too much requirements on the site, accurate detection and output of relevant parameters cannot be carried out on the vehicle steering process, repeatability is poor, and the test in the unmanned related field can be carried out by combining with hardware in-loop equipment. The ring simulation test and the vehicle finite element simulation of the vehicle are important links in the automobile research and development stage, but cannot be used for verifying various performances of the whole vehicle and related parts, and cannot replace links of the actual vehicle test, so that the actual vehicle test is still required to be performed on the trial-manufactured vehicle. Therefore, how to overcome the limitation of site conditions and improve the test effect is a problem to be solved by the person skilled in the art. Disclosure of Invention In view of the above, the invention provides a shaft coupling dynamometer, which overcomes the limitation of site conditions and improves the testing effect. The invention also provides a whole vehicle testing method. In order to achieve the above purpose, the present invention provides the following technical solutions: A shaft-coupled dynamometer, comprising: A stand; the power measuring machine is connected with a hub axle of the tested vehicle through a connecting flange and used for transmitting the rotation of the hub axle of the tested vehicle into the power measuring machine; a steering load system for applying a load force to a steering operation and a return operation of the vehicle under test, the steering load system being disposed on the stage; The steering load system is provided with a directional wheel mechanism, the axis of a directional wheel in the directional wheel mechanism is positioned on the vertical middle plane of the dynamometer, the vertical middle plane of the dynamometer is a plane along the vertical direction and passing through the axis of the connecting flange, and in the steering process of the tested vehicle, the motion track of the directional wheel mechanism of the shaft coupling dynamometer is a circular arc track, and the circle center of the circular arc track is the circle center of the steering motion track of the hub. Optionally, in the shaft coupling dynamometer, the steering load system further comprises a directional wheel driving device and a synchronous connecting device, wherein the synchronous connecting device is positioned between the directional wheel driving device and the directional wheel mechanism; the driving end of the directional wheel driving device is connected with the power input end of the synchronous connecting device, and the power output end of the synchronous connecting device is connected with the directional wheel mechanism; The directional wheel driving device provides load force for the directional wheels of the directional wheel mechanism through the synchronous connecting device, and the load force is used as a force for driving the hub wheel shaft of the tested vehicle to rotate and return through the shaft coupling dynamometer. Optionally, in the shaft coupling dynamometer, the synchronous connection device Comprises a first synchronous wheel, a second synchronous wheel and a transmission part; the driving end of the directional wheel driving device is connected with the first synchronous wheel, and the central line of the driving end coincides with the axis of the first synchronous wheel; the directional wheel of the directional wheel mechanism is connected with the second synchronous wheel, and the axis of the directional wheel is coincident with the axis of the second synchronous wheel; The transmission part is connected with the first synchronous wheel and the second synchronous wheel, and the first synchronous wheel and the second synchronous wheel synchronously rotate through the connection of the transmission part. Optionally, in the shaft coupling dynamometer, the directional wheel mechanism further comprises a directional wheel mounting frame and a wheel shaft, wherein the dir