Engine Calibration Services

APR has engineered a disciplined calibration methodology that delivers world-class high quality, performance, durability and robustness while significantly reducing development time and expenditures. Starting with mean-value components, each calibration is performed in a critical order and checked against traceable systematic sign-off procedures that are designed to safeguard powertrain durability throughout its useful lifecycle. The methodology employs a custom auto-calibration toolset with both on and offline numeric optimization. APR specializes in SULEV emission standards and holds over 20 CARB exemption certifications.

Mass Airflow Sensor Transfer Function

Mean mass airflow vs. voltage

Speed throttle backflow/tuning correction

Temperature corrections

Dynamic characterization

Injector Transfer Function

Mean slope/offset including nonlinear regions

Bernoulli/tuning delta-pressure correction

Dynamic characterization

Airflow Model Calibration

Manifold filling

Cylinder charge temperature and residual mass ratio

Volumetric efficiency with EGR, VCT, variable intake geometry and forced induction

Speed-throttle characterization

Transient Fuel Calibration

Wall-wetting calibration

Lost-fuel compensation

Feed-forward calibration

Robust Air/Fuel Ratio Trajectory Calibration

Individual cylinder air/fuel ratio distribution correction

Catalyst temperature protection

Engine durability protection

MBT Spark Calibration

Torque loss sensitivity analysis from borderline requirements

Borderline Spark Calibration

Variable Soak Air, Fuel and Spark Calibrations




APR Engineering Services Engine Calibration Services Unique Calibration Services Modeling and Control System Design Services Software Services Hardware Services
Engine Calibration Services APR has engineered a disciplined calibration methodology that delivers world-class high quality, performance, durability and robustness while significantly reducing development time and expenditures. Starting with mean-value components, each calibration is performed in a critical order and checked against traceable systematic sign-off procedures that are designed to safeguard powertrain durability throughout its useful lifecycle. The methodology employs a custom auto-calibration toolset with both on and offline numeric optimization. APR specializes in SULEV emission standards and holds over 20 CARB exemption certifications.

Mass Airflow Sensor Transfer Function Mean mass airflow vs. voltage Speed throttle backflow/tuning correction Temperature corrections Dynamic characterization Injector Transfer Function Mean slope/offset including nonlinear regions Bernoulli/tuning delta-pressure correction Dynamic characterization Airflow Model Calibration Manifold filling Cylinder charge temperature and residual mass ratio Volumetric efficiency with EGR, VCT, variable intake geometry and forced induction Speed-throttle characterization Transient Fuel Calibration Wall-wetting calibration Lost-fuel compensation Feed-forward calibration Robust Air/Fuel Ratio Trajectory Calibration Individual cylinder air/fuel ratio distribution correction Catalyst temperature protection Engine durability protection MBT Spark Calibration Torque loss sensitivity analysis from borderline requirements Borderline Spark Calibration Variable Soak Air, Fuel and Spark Calibrations