Introduction
In the second part of this series, we introduced the principal standardized tests used to evaluate the performance of the Electronic Stability Control (ESC) system and discussed their role in assessing vehicle dynamic behavior. However, the results of these tests are only valid and reliable when the vehicle’s dynamic data are measured and recorded with a high degree of accuracy.
For this reason, automotive proving grounds, vehicle manufacturers, and developers of safety systems rely on advanced measurement, data acquisition, and analysis equipment. These technologies enable precise evaluation of ESC performance, detailed investigation of vehicle behavior during various driving maneuvers, and comprehensive analysis of control algorithm performance.
This article introduces the principal equipment used in ESC testing—including INS/GNSS systems, steering robots, pedal robots, data acquisition (DAQ) systems, CAN bus analysis tools, and other specialized measurement equipment—and explains the role of each in the evaluation of Electronic Stability Control performance.
Measurement, Data Acquisition, and Performance Evaluation Equipment for Electronic Stability Control (ESC)
The reliability of dynamic vehicle test results depends not only on the execution of the test maneuvers but also on the accuracy of the measurement equipment. During standardized tests, vehicle dynamic parameters are recorded with very high precision and high sampling rates, allowing the actual vehicle behavior to be compared with the expected performance.
Today, automotive manufacturers, proving grounds, research laboratories, and safety system developers employ a combination of advanced technologies, including inertial navigation systems, vehicle control robots, data acquisition systems, and CAN network analysis tools. These instruments enable accurate measurement of vehicle dynamic variables and detailed evaluation of control system performance under real driving conditions.
- Inertial Navigation System and Global Navigation Satellite System (INS/GNSS)
The most important equipment used in ESC testing is the Inertial Navigation System (INS), which is typically integrated with a Global Navigation Satellite System (GNSS) receiver. The combination of these two technologies enables highly accurate measurement and estimation of vehicle motion, even during aggressive driving maneuvers.
The INS consists of precision gyroscopes and accelerometers that measure the vehicle’s angular velocity and linear acceleration. The GNSS receiver provides information on vehicle position, speed, and trajectory using satellite signals. By combining data from both systems through sensor fusion, highly accurate and stable estimates of vehicle motion are obtained.
The principal parameters measured or estimated by an INS/GNSS system include:
- Three-dimensional vehicle position
- Longitudinal and lateral velocity
- Longitudinal acceleration
- Lateral acceleration
- Yaw rate
- Roll rate and pitch rate
- Roll angle and pitch angle
- Sideslip angle (typically estimated)
- Vehicle trajectory
In professional vehicle testing, positioning accuracy typically reaches centimeter-level precision through RTK-GNSS (Real-Time Kinematic GNSS) technology. Sampling rates generally range from 100 Hz to 1000 Hz, making these systems well suited for analyzing rapid dynamic maneuvers.
- Steering Robot
A steering robot is one of the most important pieces of equipment used in standardized vehicle testing. Mounted directly on the steering wheel, it can apply steering inputs with extremely high precision according to the steering profiles specified by international test standards.
Because no human driver can repeatedly perform the same maneuver with identical steering angle, steering rate, and timing, the use of a steering robot is essential for achieving repeatable results in many standardized tests.
The primary capabilities of steering robots include:
- Precise steering angle control
- Accurate steering rate control
- Automatic execution of standardized steering profiles
- Excellent repeatability
- Elimination of driver-induced variability
AB Dynamics is one of the world’s leading manufacturers of steering robots, and its systems are widely used by automotive manufacturers and accredited proving grounds around the world.
- Pedal Robot
To ensure identical initial conditions for every test, pedal robots are used to control the accelerator, brake, and, in some applications, the clutch pedal.
The primary functions of these systems include:
- Maintaining a constant initial vehicle speed
- Applying precise brake inputs
- Executing standardized acceleration and deceleration profiles
- Eliminating driver-related variability
The combination of a steering robot and a pedal robot ensures that every test begins under identical conditions and can be repeated with a very high degree of consistency.
- Data Acquisition System (DAQ)
All information collected from sensors, INS/GNSS systems, and the vehicle’s internal communication network must be recorded simultaneously. This function is performed by the Data Acquisition System (DAQ).
An advanced DAQ system can record hundreds of synchronized data channels at high sampling rates. The collected data are subsequently analyzed to evaluate vehicle performance and the effectiveness of the ESC system.
Commonly used DAQ platforms include:
- Dewesoft
- HBK QuantumX (formerly HBM)
- National Instruments (NI)
- imc Test & Measurement
These systems are also capable of synchronizing data from sensors, cameras, navigation systems, and the vehicle’s CAN network.
- CAN Bus Data Analysis
In addition to external measurements, valuable information can be obtained directly from the vehicle through the Controller Area Network (CAN) bus. These data provide insight into the operation of the ESC system and other Electronic Control Units (ECUs), allowing engineers to evaluate system behavior and control strategies in real time.
Depending on the vehicle architecture and the level of access to vehicle data, the following information may be available through the CAN (Controller Area Network) bus:
- Individual wheel speeds
- Steering-wheel angle
- Yaw rate (available in some vehicles)
- Brake hydraulic pressure or brake system-related information
- ESC activation status
- ESC intervention level
- Anti-lock Braking System (ABS) status
- Traction Control System (TCS) status
- Engine torque
- Throttle position
- Longitudinal and lateral acceleration (available in some vehicles)
By comparing CAN bus data with measurements obtained from the INS/GNSS system, engineers can accurately evaluate the performance of the control algorithm, determine the onset of ESC intervention, assess braking intensity, and analyze engine torque management with a high degree of precision.
- Other Equipment Used in ESC Testing
Depending on the objectives of a development or research program, additional measurement equipment may also be employed, including:
- Wheel Force Transducers (WFTs): Used to measure the forces and moments acting on individual wheels.
- Steering Torque Sensors: Used to measure the torque applied to the steering system.
- Optical Speed Sensors: Used for highly accurate vehicle speed measurement, particularly when wheel speed measurements may be affected by tire slip.
- High-Speed Cameras: Used for visual analysis of vehicle maneuvers and dynamic behavior.
- Suspension Displacement and Ride Height Measurement Systems: Used to evaluate load transfer and body motion during advanced vehicle dynamics testing.
These instruments play a particularly important role in vehicle development programs and academic research, where detailed analysis of vehicle dynamic behavior is required.
The Role of IIHS and Euro NCAP in ESC Evaluation
A common misconception is that the Insurance Institute for Highway Safety (IIHS) performs an independent test to certify the performance of Electronic Stability Control systems. In reality, IIHS does not conduct a test equivalent to FMVSS No. 126 and does not directly certify ESC performance.
In the United States, ESC compliance is established according to the requirements of FMVSS No. 126, and manufacturers must demonstrate that their vehicles satisfy these regulatory performance criteria before entering the market. Vehicles may subsequently undergo safety evaluations conducted by IIHS.
Similarly, Euro NCAP does not perform an independent regulatory test to verify the baseline ESC performance required by UNECE Regulation No. 140. However, the presence and proper functioning of ESC are considered fundamental prerequisites for achieving high vehicle safety ratings. In recent years, Euro NCAP has increasingly focused on evaluating Advanced Driver Assistance Systems (ADAS) and their interaction with ESC during safety assessments.
Consequently, although neither IIHS nor Euro NCAP serves as the regulatory authority for ESC certification, their evaluation programs provide valuable indirect evidence of the overall integration and effectiveness of a vehicle’s active safety systems.
Conclusion
Electronic Stability Control (ESC) is one of the most important active safety technologies in modern vehicles. By combining information from multiple sensors, vehicle dynamic models, and advanced control algorithms, the system helps prevent loss of stability caused by understeer, oversteer, and tire slip. Through selective wheel braking and engine torque management, ESC generates corrective yaw moments that assist the driver in maintaining the intended vehicle path.
Given the critical role of ESC in vehicle safety, its performance must be evaluated under a wide range of driving conditions in accordance with internationally recognized standards. FMVSS No. 126 and UNECE Regulation No. 140 provide the principal regulatory framework for ESC performance evaluation, while test maneuvers such as Sine with Dwell, Double Lane Change, Fishhook, and J-Turn are widely used to assess vehicle dynamic behavior under critical driving conditions.
Accurate execution of these tests would not be possible without advanced measurement technologies. INS/GNSS systems, steering and pedal robots, data acquisition systems, force measurement instruments, and CAN bus analysis tools enable engineers to precisely measure and analyze both vehicle dynamics and ESC performance. Beyond regulatory compliance, the results of these evaluations contribute significantly to the development of safer vehicles, the refinement of control algorithms, and the reduction of traffic fatalities and serious road accidents.
Author: Zahra Shirband – International Relations Expert ISQI
References
- National Highway Traffic Safety Administration (NHTSA). Federal Motor Vehicle Safety Standard No. 126: Electronic Stability Control Systems. U.S. Department of Transportation. Available at: https://www.nhtsa.gov (Accessed August 2, 2026).
- United Nations Economic Commission for Europe (UNECE). UN Regulation No. 140: Uniform Provisions Concerning the Approval of Passenger Cars with Regard to Electronic Stability Control (ESC) Systems. Geneva, Switzerland. Available at: https://unece.org (Accessed August 2, 2026).
- International Organization for Standardization (ISO). ISO 3888-1:2018, Passenger Cars—Test Track for a Severe Lane-Change Manoeuvre—Part 1: Double Lane-Change. Geneva, Switzerland: ISO, 2018.
- Rajamani, R. Vehicle Dynamics and Control, 2nd ed. New York, NY, USA: Springer, 2012.
- Gillespie, T. D. Fundamentals of Vehicle Dynamics. Warrendale, PA, USA: SAE International, 1992.
