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Basic CalibrationCustomer RequirementsThe engine’s steady state and dynamic basic calibration on the test bed provide the foundation for achieving the vehicle’s target values. The basemapping has to represent the engine physics as good as possible to avoid later calibration loops during the vehicle calibration phase. The full-load characteristic and consequently the vehicle’s performance are influenced as well as emissions and fuel consumption.
For Diesel engines additionally acoustic targets have to be taken into account. Modern Gasoline and Diesel engines offer a high number of independent calibration parameters. An optimum combination of these parameters has to be achieved, to guarantee the full potential of the technology. To deal with the high complexity, appropriate calibration methods have to be applied. Such methods have to reduce the needed calibration time and to guarantee a high test bed utilisation.
The base calibration starts very early in the calibration process when engines and components are only available in a limited number. Nevertheless it is necessary to consider possible tolerances during the base calibration phase.
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AVL Strengths- Optimum calibration of all parameters through
- AVL’s long experience in thermodynamic development
- Efficient and economic use of all test facilities based on our well-founded know-how in instrumentation development
- Application of automation methods and DoE
- Broad experience based on many successfully performed SOP-projects
- Experience with component tolerances
Customer Benefits- Full utilisation of the engine’s potential, achievement of technical targets
- Calibration with high tolerance robustness
- Time reduction by means of automated calibration methods
- Trust in AVL’s high potential of understanding manufacturer and market needs
- High quality and reproducibility under all boundary conditions
- Flexibility through a professional calibration data management
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AVL ApproachFor the best calibration of the important thermodynamic parameters AVL can perfectly utilise their long-term experience in combustion development. Additionally the know-how about modern ECUs and the experience of many SOP-projects is applied. The basic calibration is usually performed on test beds depending on the respective ECU function either steady-state or dynamic test beds are used. If the calibration is influenced by the vehicle package a verification and a fine tuning is performed in the vehicle on a chassis roller.
Standard calibration tasks are automatically calibrated on the test bed by means of automatic routines, so-called iProcedures. For complex optimisation tasks with a high number of independent parameters DoE is used. Standard measurements like WOT or mapping are performed in un-manned, automatic operation. As automated routines require highest standards with respect to accuracy, reproducibility and safety test beds are equipped with advanced test systems. |
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Services- Full load optimisation
- Charge model, torque model
- Control of variable systems (e.g. valve timing, intake system, charge motion)
- Ignition & injection mapping, including exhaust gas temperature control
- Boost control (if applicable)
- Knock detection and knock control
- Lambda control
- Robustness investigations
- Correction functions (e.g. temperature correction)
- Wall wetting model (for MPFI engines)
- Torque model
- Rail pressure, injection mapping (pre-, main-, post- injection)
- Control of variable systems (e.g. swirl)
- Full load optimisation, torque limitation
- Smoke limitation
- Boost control
- EGR control
- Temperature and altitude correction
- Basic emission calibration, including regeneration strategies (e.g. DPF)
- Robustness investigations
Tools, Methods & TechnologiesFacilities & Resources |
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