Vehicle steering test system

Overview

The system performs vehicle steering system tests with real-time data acquisition and automatic processing.

Test programmes

Steering operating force (motor vehicles)
Understeer (motor vehicles)
Vibration when leaving the steering circle (motor vehicles)
Steering operating force during continuous figure-eight turns (motor vehicles)
Steady steering circle and turning radius (motor vehicles and road trains)
Steering corridor width and turning radius (motor vehicles and road trains)
Outswing when entering the steering circle (motor vehicles and road trains)
Outswing when leaving the steering circle (motor vehicles and road trains)
Straight driving and vibration (motor vehicles and road trains)
Vehicle pulling / lateral deviation

Embedded software

Windows CE operating system with power-loss tolerance
Automatic processing after testing
Online and offline export and printing
Classified data management

The steering tests follow Basic Requirements for Automotive Steering Systems. Steady turning circle and radius, corridor width, and entering-circle outswing measurements also follow Measurement Methods for Minimum Turning Diameter, Minimum Turning Corridor Diameter and Outswing of Motor Vehicles. Vehicle lateral deviation is assessed under Test Methods for Vehicle Lateral Deviation.

Technical specifications

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Vehicle steering system test system specifications

Basic specifications

Operating temperature	-20~60 ℃
Storage temperature	-30~70 ℃
Operating humidity	10%~90%RH ( non-condensing )
Power supply	12 V DC; wide input range 8–30 V; reverse-polarity protection

Test host

Data sampling frequency	100Hz
GPS Raw update rate	100Hz
Vehicle speed measurement range	0.3~400km/h
Vehicle speed measurement accuracy	±0.1km/h
Distance measurement accuracy	±15cm (RTK mode ±2cm)
Time measurement accuracy	±0.01s
Touch display	industrial-grade touch display 7 inches , clock frequency 1GHz, backlight life 25000 hours
Analogue voltage channels	24 bit high-precision A/D converter , 4 channel , 1 channel accepts strain signals directly , the other 3 channels input range ±10V
High-speed analogue input	16 channel 16 bit high-speed AD, measures vibration signals
Frequency measurement	1 high-precision frequency measurement channel , counting , accepts input TTL quadrature pulse signal ; Measurement range : 0Hz~50kHz; 1 trigger signal channel , connects to a brake trigger switch
Hand controller	1 hand controller for remote control of the test process , allows direct operation by the driver , improves testing efficiency
Communication interface	2 channels CAN Interface , 2 channels RS232 Interface
Printer	built-in microprinter , prints test results online or offline
Data processing and storage	automatic test data processing , real-time raw data storage , storage capacity 8G
GPS	supported GPS dual-antenna high-precision heading measurement , can connect to GPS local or Qianxun base station
Expandability	Hardware expansion support , supports basic vehicle performance , handling stability , ABS testing , ride comfort testing

Steering torque, angle and vibration sensor

Angle measurement	range : ±1500°, resolution : 0.025° , accuracy : ±0.0066%FS
Torque measurement	range : ±100Nm, resolution : 0.01Nm, accuracy : ±0.3%FS
Angular velocity measurement	range : ±1000°/s, resolution : 0.05°/s, accuracy : ±0.01%FS
Three-axis vibration acceleration measurement	range : ±5g, Frequency Range 0.5~5000Hz, accuracy ±1%FS
Steering wheel diameter	approximately 350mm (450mm optional )
Encoder	encoder angle measurement , zero can be set at any position , no limit on the number of revolutions
Analogue output	three-axis vibration acceleration signal , output voltage ±10V, resolution 1/60000

Driver multi-parameter display

Display specifications	high contrast and brightness 5 inch display , Brightness 900nit, readable in sunlight , wide viewing angle , display resolution 800x480, Operating temperature -20～70℃, Operating Voltage 5～15VDC, Power consumption 3W, imported strong suction-cup mount , stable mounting , easy installation and removal ;
Functions	according to the test programme , automatically switches displayed parameters ; displays satellite count , test mode , test status indication .

Hand controller

Functions	remote triggering during testing , driver or the operator can control the test with the hand controller start and end ; during condition-triggered tests , can also be controlled with the hand controller , prepare for the test status , automatically starts and ends when conditions are met .
Contact characteristics	normally open passive contact , closes when pressed
Trigger force value	10N
Housing material	aluminium alloy
Wire	18AWG, wire length 2m
Contact endurance	one million cycles

trailer GPS Test module

Protocol output	RS232 or RS422 custom protocol output
Command output	RS422 GPS standard command output , for long-distance transmission
Output	distance pulse output (TTL signal level ) pedal input and output (TTL signal level ) PPS output (TTL signal level )
antenna	accepts single or dual antennas
Indicator LEDs	four LED indication : satellite count , operating status , radio data , Qianxun data
Communication	built-in data radio or Qianxun 4G RTK terminal
Satellite signal	Raw update frequency 10~100Hz, internal interpolated update rate 500~1000Hz
Other specifications	1.54 inches OLED display and one-button operation
Operating Voltage	12V ( wide input voltage 8~30V)

Local differential base station

Accuracy	provides the mobile station with GPS differential correction data , supported 2cm positioning accuracy
Effective communication radius	5km ( open terrain , antenna height 2 m , baud rate 9600)
Data radio	built-in data radio , Communication frequency : 380~470Mhz
Accessories	includes a high-capacity lithium battery pack , tripod ; supported 48 hours of continuous battery operation ;
Operating Voltage	12V ( wide input voltage 8~30V)

Data radio

Communication interface	1 channel RS232, default baud rate 115200 ( selectable 57600,38400, 19200, 9600,4800,2400) 1 channel CAN; communication rate : 125K, 250K, 500K, 1M adjustable ;
Carrier frequency	433MHz
Antenna connector	SMA
Display method	0.91 inch OLED
Status indicators	3 units LED ( power supply , data transmission , data reception )
Display method	0.91 inch OLED
Parameter settings	configurable address and channel , air data rate and other parameters
Supply voltage	12VDC (7~30V wide supply range )
Power consumption	About 2W
Operating temperature	-20~+60℃
Operating humidity	10–90% RH, non-condensing
Storage temperature	-30~+70℃
Overall dimensions (LWH)	110mm×58mm×30mm

Network differential base station

RTK service	supports Qianxun centimetre-level network RTK service
Multi-constellation support	supports one or multiple constellations , supports one or multiple frequencies
Differential data	obtains differential corrections over the network , supported NTRIP CLIENT Protocol
Protocol	obtains RTCM3.2/RTCM3.0/CMR/CMR+ and similar options
GNSS	GNSS differential protocol
Communication interface	RS232
Communication	industrial-grade 4G Communication , supports China Mobile / China Unicom / China Telecom /GPRS, stable data transmission
LED Status indicators	RTK and DATA
SIM card support	NANO SIM card
Operating Voltage	12V (8~30V wide input voltage ), power consumption approximately 1W
Operating temperature	-20~+60℃
Operating humidity	10–90% RH, non-condensing
Storage temperature	-30~+70℃

System configuration

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Measurement and control host	Dual-antenna host with embedded software and printer
Steering torque, angle and vibration sensor	Three-axis vibration measurement
Driver display	Multi-parameter display
Hand controller	Remote test control
Host antenna	GPS antenna
Trailer GPS module and antenna	Required for road-train testing
Local differential base station	Optional radio differential base
Radio module	Optional; antenna included
Network differential base station	Optional; 4G antenna and five-year service fee
Accessories	Power and signal cables; carrying case