ECU Calibration and Emissions tests on Engine Test Benches
Following to the Geneva Convention of 1979, many antipollution regulations occurred. Today, heavy-duty engine manufacturers must apply on their new engines certification tests such as EURO III, EURO IV and US Heavy Duty Transient Cycle. The implementation of normalized tests on a certification test bench is the last step of a new engine development process. Before to reach this step, the way is long and complex, as the engine control parameters are increasing due to new technologies. It is during the engine calibration step where these parameters are adjusted. To speed up this step, test centres have to optimize their work methods and their test equipments. D2T have works in that direction, offering innovating solutions to perform easily engine’s certification tests with all associated calculations.

Diesel multi-injection combustion noise evaluation
SIA 2004 International Conferences « Diesel : Today and Tomorow » The main task in diesel engine tuning is to meet the emission regulations, keeping customer’s satisfaction (fuel economy, torque, noise,…), and reducing tuning cost.
Using a standard combustion analysis tool named Osiris, a new method has been developed to adapt the calibration combustion noise criteria to multi-injection strategies on the entire engine operating range.By using multiple maximum pressure gradients and their locations in the cycle, combustion noise integration in the calibration process can be more accurate and therefore improved.
First results from automatic calibration testing are very promising.

On-line Plausibility check
Engine parameters increase make more complex engine’s tests calibration. But at the same time, engine manufacturer want to reduce the time dedicated to these tests. So, test centers must improve their productivity optimizing tests tools.
For this purpose, during the 5th cycle of conference CNAM-SIA “rational use of energy”, D2T presents its solution for on-line plausibility check applied to engine test bed.

Torque meter fitting on dynamometer shaft
Torque measurement is an essential quantity for engine and powertrain development. D2T offers solutions and systems ; safe, accurate and raceable to National Standards while using in-line torquemeter along with dynamometers.

Reducing torsional vibrations by firing order tuning on a V-engine
Torsional behaviour optimisation of high speed V-engines is possible through a smart firing order tuning choice with the use of specifically designed analysis tools. Using dummy datas of V-engine, our software Vibmot illustrates compromises to determine the best firing order depending of the most frequently used range of rotation speed. Alternative solutions which can avoid the compromise imply the use of pendulum vibration absorbers tuned on the most pre-eminent harmonics.

Scavenging test rig
D2T group has developped an hydraulic machine allowing the study of a scavenging. The hydraulic machine is cheaper than the building of a real prototype, more precise than the CFD, able to give a visualisation of the scavenging losses and allows to test very quickly a lot of configurations.

Engine scavenging optimization
In order to meet future emission standard, it is essential to improve the scavenging flow, and especially the trapping efficiency of the engines. A special test stand has been developed by D2T group to visualize and quantify the scavenging process.

Emission and consumption reduction for two-stroke gasoline engine
In order to meet future emission standard, different concepts have been implemented on a small two-stroke engine. Significant gains have been observed concerning polluant emissions as well as fuel consuption.These concepts allows small two stroke engine to meet future regulations, keeping its advantages in price and weight.

Another way for automatic ECU calibration
D2T's concept of a one CPU system for full ECU calibration. This new concept takes all benefits of recent computer improvement in order to get rid of old and heavy system architecture. Dedicated user interface and integrated command to optimisation tools and ECU application systems are merged one same CPU as automation system.

P.A.R.I.S.
Evolution of automotive diesel engines has led to the production of smaller and smaller engines with increasingly higher torque. The reduction in external dimensions means smaller flywheels, and the increase of torque rates, higher cyclic irregularities that today's flywheels even with a dual mass techniques are no longer able to cope with. The best solution to cope with these problems is a tuned rotating pendulum : P.A.R.I.S. (Pendulum Acyclism Reducer Integrates System). This vibration absorber system can be easily integrated into a standard engine flywheel.

Two complementary oil analysis systems for thermal engine development
- The SMAC from D2T and developed under French Petrol Institute (IFP) License is a measurement system of aeration based on the difference of gas compressibility and oil compressibility.
- OSA is an optical emission spectrometer and an infrared spectrometer for oil sample analysis.

Common Rail Mapping on Powertrain Test Bed
D2T has developed a mean and simple methodologies, fast and reliable to adjust the mapping strategies of the particulate filter implementation for Common Rail engines. It also validates different technological solutions that solve inherent difficulties of such depollution system.

New approach to measure instantaneous angular behaviour of a dual mass flywheel
The analysis of angular behaviour of a Dual Mass Flywheel (or any other flywheel) is very important to understand and identify noises that occur in the transmission. The reduce space between engine and gearbox doesn’t allow any complex instrumentation like the use of an encoder for instance. D2T has developped a new method to measure the angle position of the flywheel based on a system called FURD, which computes in real time the angular deviation, and make easier the friction analysis.

SMAC
Gas entrainment in engine oil circuit generates many problems. A new oil gas content measurement apparatus, the SMAC, has been developped by IFP and D2T. It is able to measure the volumetric gas to oil ratio at any point of the engine oil circuit while running, without influencing the pressure or temperature of the oil.