performance traction control (ptc)

PERFORMANCE TRACTION CONTROL

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Performance Traction Control(PTC)Stability Margin Improvement

Maximum Longitudinal Acceleration

Controlled Drifting

Certifiable as ISO 26262.

The Performance Traction Control algorithm gives more control and feeling to the driver without compromising safety.It allows to relax the intervention of the stability control without compromising the stability and the safety of the vehicle.

Our Performance Traction Control maximizes the performance in every driving condition giving the vehicle the maximum available acceleration in exiting turns.When used for fun it keeps the vehicle easy to drive and safe even in the most accentuated drifting maneuvers.

Side-Slip Angle (beta) Estimator(SSE 2.0)Our Side-Slip angle Estimator (SSE 2.0) is a software algorithm ready to be integrated in any ECU.

This algorithm runs in Real-Time on a fraction of the resources already available on modern ECUs (15% CPU occupation on Infineon TC1767) and uses exclusively the data already available on the vehicle CANBus.

It is insensitive to different tire sizes, tire conditions, environmental (grip) conditions.

It is certifiable as ISO 26262.


Features•No Additional Sensors: works with CANBus data @ 50Hz or 100Hz

•Robust (insensitive) to Tire Wear and Temperature

•Works in any handling and road conditions

•Available for 2WD and 4WD and 4 wheel steering vehicles

•Wheel Speed

•Front Steer Angle (and rear steer angle when available)

•Ax; Ay; Yaw Rate

Technical Data•ZERO response Lag

•Maximum estimation Error on Wet / Dry conditions: 0.4° RMS

•Maximum estimation Error on Snow / Ice: 1.1° RMS

•Vehicle Speed: from 10 to 300 km/h

The sideslip angle estimator uses only the informations already available on the vehicle’s CANBus.

This is important because it means that it does not require any additional hardware: this is just a pure software implementation.

Our algorithm has been integrated in the controls of thousands of production cars ranging from two to four wheel drive and from two to four wheel steering

vehicles.You can find a full description of the SideSlip Angle Estimator algorithm in a

separate presentation.

• PTC 0

• PTC 1

• PTC 2

• PTC 3

PTC comes in 4 configurations

PTC 0 : Δ slipprovides the Δ slip to be added to the reference signal

Performance Traction Control + Traction

Control ECUReference Slip

Traction ControlReference Slip

Vehicle CANBus

Δ Slip

The PTC 0 configuration provides the Delta Slip value to be added to the available reference slip signal.The new reference signal will be the sum of the two and will be used as the new reference for the Traction Control System.

PTC 1 : direct Slip Reference Signalmaximum leeway for PTC to improve the performance

Performance Traction Control ECU

Vehicle CANBus

Reference Slip Traction Control

The PTC 1 configuration provides the input Slip Reference Signal directly to the traction control loop. This solution ensures additional leeway for PTC to improve the performance.

PTC 2 : Reference Engine Torque signalbypass the slip control loop


Vehicle CANBus

Reference Engine Torque

The PTC 2 provides the Reference Engine Torque signal in input to the engine control loop. PTC 2 bypasses the slip control loop and directly generates the desired reference signal.

PTC 3 : Reference Engine Torque + Throttle signalbypass the slip control loop and assures the maximum performance


Vehicle CANBus

Reference Engine Torque

Throttle

The PTC 3 provides both the Reference Engine Torque signal and the Throttle signal as input to the engine control loop.This configuration ensures the maximum potential performance.

•Data Collection

•Identification of the SideSlip Angle Estimator

•Calibration of the Performance Traction Control

•Validation of the PTC on the simulator

•Validation on the real vehicle

Workflow


Workflow Step 1Data Collection

The First Step in the workflow is about collecting vehicle data on different grip conditions, tire sizes, driving style and sideslip angles.

Since this step is costly and time consuming if performed on a test track, we established a partnership with VI-grade to integrate their simulator in the

process.In this way most of the required tests can be performed on the VI-grade

Dynamic Simulator.The use of the Simulator ensures more repeatability of the tests and easier

setups, savings in testing times and costs.On the Simulator it is possible to carry-out the frequency sweep steer test,

the steady state maneuvers, launch control and ABS maneuvers

Workflow Step 2SideSlip Angle Estimator

The Second Step is the Identification of the mathematical model for the SideSlip Angle Estimator.

This step is basically a training of our nonlinear models and it’s carried-out on our proprietary Computing Cluster.

We consider this stage done when the performance estimation is generalized and stabilized across all the different working conditions.

Workflow Step 3PTC Calibration

The Third Step in our workflow is the calibration of the Performance Traction Control algorithm.This step is typically performed in simulation.

Thanks to our partnership with VI-grade we can develop seamlessly using the VI-CarRealTime vehicle models. In this way we can analyze the robustness to the different working conditions of a given calibration setup in a controlled environment while saving time and lowering testing costs.

Workflow Step 4PTC Validation on Simulator

The Fourth Step is the validation on the simulator in a much wider range of driving conditions.

By using the Simulator, it is possible to reduce the number of tests to be performed on the test track by more than 50%.

In this phase the simulator allows the pilot, professional and non professional, the opportunity to test safely the vehicle in drifting conditions

and give important feedback about the performance and feeling.

Workflow Step 5PTC Validation on Vehicle

The fifth and final step is performed on the real vehicle: here we drive the system on the test track with professional drivers and check that the performance and the feelings transmitted by the vehicle will fulfill the customer’s requirements and expectations.

Now the Performance Traction Control is ready to be embedded in the vehicle’s ECU and go to production.

Addfor s.r.l.www.add-for.com

P.zza Solferino 7Torino 10121 (TO) - Italy

performance traction control (ptc)

Automotive