CN-121979176-A - Test platform and test method for steer-by-wire system

CN121979176ACN 121979176 ACN121979176 ACN 121979176ACN-121979176-A

Abstract

The invention discloses a test platform and a test method of a steering-by-wire system, wherein a fixed tool comprises an up-turning tool and a down-turning tool, the up-turning tool is used for installing a road feel simulator assembly, the down-turning tool is used for installing a line control actuator assembly, test equipment comprises a driving unit used for driving an input shaft of the road feel simulator assembly and a loading unit used for applying load to an output end of the line control actuator assembly, and a control system is respectively and electrically connected with the road feel simulator assembly and the line control actuator assembly and used for establishing a control closed loop between the road feel simulator assembly and the line control actuator assembly and sending a control instruction to the test equipment. Through the fixed frock that contains the frock that changes up and change down, the test equipment that drive and loading combine and establish control system, the mechanical installation and the automatically controlled interactive logic of drive-by-wire steering system in whole car have been reproduced, the collaborative work of drive-by-wire executor assembly and feel simulator assembly can be carried out the integration and test.

Inventors

WU WEI
LONG XINRONG
GAO WANGJIE
YAN SHUAILIN
DENG XIAOFENG
XU WEI

Assignees

杭州世宝汽车方向机有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (8)

1. The test platform of the steer-by-wire system is characterized by comprising a fixed tool, test equipment and a control system; the fixing tool comprises an up-turning tool and a down-turning tool, the up-turning tool is used for installing the road feel simulator assembly, and the down-turning tool is used for installing the line control actuator assembly; the test equipment comprises a driving unit for driving the input shaft of the road feel simulator assembly and a loading unit for applying load to the output end of the drive-by-wire actuator assembly; The control system is respectively and electrically connected with the road feel simulator assembly and the drive-by-wire actuator assembly, and is used for establishing a control closed loop between the road feel simulator assembly and the drive-by-wire actuator assembly and sending a control instruction to the test equipment.
2. The steer-by-wire system test platform of claim 1, wherein the up-conversion tooling comprises an up-conversion tooling base plate and a plurality of up-conversion mounting blocks arranged on the up-conversion tooling base plate, wherein the up-conversion mounting blocks are used for being connected with mounting points on the road feel simulator assembly; The down-turning tool comprises a down-turning tool bottom plate and a plurality of down-turning installation blocks arranged on the down-turning tool bottom plate, wherein the down-turning installation blocks are used for being connected with installation points on the line control actuator assembly.
3. The steer-by-wire system test platform of claim 1, wherein the control system injects a preset fault signal into the road feel simulator assembly and the brake-by-wire actuator assembly, the preset fault signal comprising at least one of a power interruption signal, a sensor signal interruption signal, and a control communication interruption signal.
4. The steering-by-wire system test platform of claim 1, wherein the control system comprises an angle controller and a current controller, the angle controller collects steering wheel angle signals, calculates target wheel angles according to vehicle speed and/or lateral acceleration, generates target torque instructions according to actual angle feedback of the target wheel angles and the actuator-by-wire assembly, and the current controller converts the target torque instructions into target current instructions and generates motor driving signals according to actual current feedback of the target current instructions and a motor of the actuator-by-wire assembly.
5. A test method based on the steer-by-wire system test platform of any one of claims 1-4, comprising the steps of: s1, fixing the road feel simulator assembly to a driving unit of the testing equipment through the up-transfer tool, and fixing the line control actuator assembly to a loading unit of the testing equipment through the down-transfer tool; S2, applying the same tightening torque to a fastener connecting the road feel simulator assembly and the upper rotating tool, and applying the same tightening torque to a fastener connecting the drive-by-wire actuator assembly and the lower rotating tool; S3, electrically connecting the road feel simulator assembly and the drive-by-wire actuator assembly to the control system, and establishing a control closed loop between the road feel simulator assembly and the drive-by-wire actuator assembly; S4, injecting a preset fault signal through the control system, and collecting output signals and state information of the road feel simulator assembly and the line control actuator assembly before and after fault injection; S5, under the driving and loading of the test equipment, the drive-by-wire actuator assembly is enabled to execute steering action, and output signals of the road feel simulator assembly and the drive-by-wire actuator assembly are synchronously collected.
6. The test method according to claim 5, wherein in step S3, establishing a control closed loop comprises the steps of: S31, applying simulated steering input of a driver to an input shaft of the road feel simulator assembly through the driving unit; S32, the control system collects steering wheel angle signals generated by the road feel simulator assembly; s33, the control system calculates a target wheel angle according to the steering wheel angle signal and sends a steering instruction containing the target wheel angle to the drive-by-wire actuator assembly; S34, the drive-by-wire actuator assembly executes the steering instruction and feeds back an actual steering state signal to the control system; And S35, the control system adjusts a control instruction sent to the drive-by-wire actuator assembly according to the deviation of the target wheel angle and the actual steering state signal, and generates a road feel feedback instruction sent to the road feel simulator assembly according to the feedback state of the drive-by-wire actuator assembly.
7. The method according to claim 5, wherein in step S4, the injected preset fault signal is used to simulate at least one fault condition of a main control channel interruption and an auxiliary control channel interruption of the road feel simulator assembly, and a main control channel interruption and an auxiliary control channel interruption of the drive-by-wire actuator assembly.
8. The test method according to claim 5, wherein in step S5, the collected output signals include at least a torque signal and an angle signal, and parameters for evaluating performance of the steer-by-wire are obtained based on the collected torque signal and the angle signal, the parameters including at least one of torque ripple, friction torque, steering response time, overshoot, and steady state error.

Description

Test platform and test method for steer-by-wire system Technical Field The invention relates to the technical field of automobile steering system testing, in particular to a steer-by-wire system testing platform and a testing method. Background The steer-by-wire system is used as an important development direction of an automobile steering technology, realizes electronization and intellectualization of steering transmission by canceling mechanical connection between a steering wheel and steering wheels, and provides more possibilities for whole automobile arrangement, automatic driving function expansion and personalized driving experience. However, the reliability, safety and performance consistency of steer-by-wire systems are highly dependent on the precise coordination of their electronic control and execution units, so that they must be subjected to rigorous test verification during the development and production stages. At present, a split type test method is mostly adopted for testing a steering system in industry, namely, a road feel simulator (up-turning) and a steering actuator (down-turning) are respectively and independently tested, and an integrated test platform capable of truly simulating the cooperative work and real-time interaction of the road feel simulator and the steering actuator in the whole vehicle environment is lacking. Disclosure of Invention According to the test platform and the test method for the steering-by-wire system, the mechanical installation relation and the electric control interaction logic of the steering-by-wire system in the whole vehicle are reproduced through the test equipment comprising the fixed tool, the driving and loading combination of the upper turning tool and the lower turning tool and the control system for establishing the bidirectional control closed loop, the cooperative work of the road feel simulator assembly and the steering-by-wire actuator assembly can be integrally tested, the test environment is closer to reality, and the result is more real and reliable. The technical scheme includes that the test platform of the steering-by-wire system comprises a fixed tool, test equipment and a control system, wherein the fixed tool comprises an up-turning tool and a down-turning tool, the up-turning tool is used for installing a road feel simulator assembly, the down-turning tool is used for installing a line control actuator assembly, the test equipment comprises a driving unit used for driving an input shaft of the road feel simulator assembly and a loading unit used for applying load to an output end of the line control actuator assembly, and the control system is respectively and electrically connected with the road feel simulator assembly and the line control actuator assembly and used for establishing a control closed loop between the road feel simulator assembly and the line control actuator assembly and sending a control instruction to the test equipment. Optionally, the up-transfer tool comprises an up-transfer tool bottom plate and a plurality of up-transfer mounting blocks arranged on the up-transfer tool bottom plate, wherein the up-transfer mounting blocks are used for being connected with mounting points on the road feel simulator assembly, the down-transfer tool comprises a down-transfer tool bottom plate and a plurality of down-transfer mounting blocks arranged on the down-transfer tool bottom plate, and the down-transfer mounting blocks are used for being connected with the mounting points on the line control actuator assembly. Optionally, the control system injects a preset fault signal into the road feel simulator assembly and the drive-by-wire actuator assembly, wherein the preset fault signal comprises at least one of a power interruption signal, a sensor signal interruption signal and a control communication interruption signal. Optionally, the control system comprises an angle controller and a current controller, wherein the angle controller collects steering wheel angle signals, calculates a target wheel angle according to vehicle speed and/or transverse acceleration, generates a target torque command according to actual angle feedback of the target wheel angle and the drive-by-wire actuator assembly, and converts the target torque command into a target current command and generates a motor driving signal according to actual current feedback of the target current command and a motor of the drive-by-wire actuator assembly. The invention also discloses a test method based on the test platform of the steering-by-wire system, which comprises the following steps: s1, fixing the road feel simulator assembly to a driving unit of the testing equipment through the up-transfer tool, and fixing the line control actuator assembly to a loading unit of the testing equipment through the down-transfer tool; S2, applying the same tightening torque to a fastener connecting the road feel simulator assembly and the upper rotating tool, and applying t