Combustion moteur

Analyseur de combustion haute précision pour la recherche, le développement, l'optimisation et le test de moteurs d'allumage, de systèmes d'échappement et de contrôle de soupapes.

Contrainte / Déformation
Contrainte / Déformation
CAN bus
CAN bus
Vidéo ultra-rapide
Vidéo ultra-rapide
Vidéo thermique
Vidéo thermique

Caractéristiques principales

  • ENTRÉES ANALOGIQUES FLEXIBLES : 8 entrées analogiques avec alimentation intégrée pour capteurs charge, tension, IEPE, déformation, couple, température,...
  • CONNEXION DIRECTE DE CAPTEURS DE VITESSE : Le système permet la connexion directe de tout type de capteurs de vitesse, tels que les encodeurs, roues dentées, capteurs à effet Hall ou inductifs, capteurs optiques,...
  • ENREGISTREMENT CAN : 1 port CAN haute vitesse est disponible pour l'acquisition directe CAN. Le logiciel Dewesoft X supporte l'OBDII, J1939 et les fichiers CAN DBC pour un paramétrage rapide.
  • HAUTE VITESSE : Amplificateur analogique haute vitesse avec convertisseur analogique-numérique 16 bits et fréquence d'échantillonnage de 1 MS/seconde par voie, idéal pour l'analyse de la combustion à haute vitesse.
  • HAUTE DYNAMIQUE : Amplificateur SIRIUS haute dynamique, de 160 dB, avec double convertisseur analogique-numérique 24 bits et fréquence d'échantillonnage de 200 kS/seconde par voie, idéal pour l'analyse de combustion sur moteurs diesel à faible vitesse.
  • EXTENSION ILLIMITÉE DES VOIES : Les systèmes d'acquisition de données peuvent être étendus indéfiniment avec des voies d'entrées analogiques, compteurs, numériques et CAN, sans aucun surcoût de licence logicielle.
  • BANCS D'ESSAIS ET COMPATIBILITÉ AVEC INCA: Le système peut envoyer les résultats d'analyse de combustion vers des bancs d'essais via protocole AK, ETAS INCA ou à des systèmes similaires via protocole CAN. L'interfaçage avec les bancs d'essais se fait via un plugin optionnel.
  • ENREGISTREMENT SYNCHRONISÉ DE SOURCES MULTIPLES : Possibilité d’acquérir de manière synchronisée des sources de données supplémentaires sur le même système (CAN, OB19, J1939, FlexRay, XCP / CCP, Vidéo, etc.).
  • COMBINAISON AVEC D'AUTRES MESURES : Le même module peut être utilisé pour l'analyse simultanée en temps réel des vibrations de torsion et de rotation, l'analyse d'ordres, la mesure de la puissance électrique, le bruit de combustion , la puissance acoustique, etc.

Application overview

Dewesoft provides a total solution for engine research, development, optimization and also for component development and testing, such as ignition systems, exhaust systems, and valve control gear.

High-end isolated SIRIUS DAQ hardware and the award-winning Dewesoft X software offer easy to use measurement and analysis. The system supports angle and time-based measurement and uses highly sophisticated algorithms for online or offline mathematics and statistics to calculate heat release and other thermodynamic parameters.

The combustion analyzer system can either be used in-car (via the INCATM interface) or it can be fully integrated into a test-bed environment. Additional synchronized acquisition from other data sources like video, GPS, CAN, FlexRay, XCP/CCP, Ethernet, can easily be combined.

In addition to combustion analysis, the same system can be used to combine other measurement applications such as hybrid vehicle testing on the powertrain, noise, and vibration measurement, all with perfect synchronization.

In-car and testbed use

For testing under the real conditions, the combustion analyzer is perfectly suited for in-car testing applications. The combination of different supported interfaces like CAN, XCP/CCP, FlexRay, any direct connection of any sensor allows acquisition of all relevant data together with the combustion cycle. The combination with INCATM via CAN interface offers a complete solution for the ECU calibration.

On the engine testbed, a combustion analyzer is a standard tool to calculate and visualize relevant physical parameters from the combustion engine and to monitor and protect the unit under the test. Different communication protocols to the control room are supported via Ethernet or RS-232 interfaces - e.g. Tornado, AVL PUMA Open. Analog output channels are of course also available.

The combustion analyzer system can be used on all types of combustion engines, such as car, truck, ship, motorcycle, power-saw, etc.

Engine R&D

The Dewesoft combustion analyzer can perform various tasks for engine research and development:

  • Misfire and knock detection
  • Friction analysis
  • Injection and ignition analysis
  • Valve control system timing
  • Combustion noise and vibrations
  • Mechanical stress diagnosis
  • Energy balance
  • Gas exchange analysis
  • Residual gas verification
  • The exhaust gas after treatment
  • Engine mapping

Intuitive configuration

The award-winning Dewesoft X software offers easy and very intuitive configuration process. Simply define the engine type with the number of cylinders and its geometrical parameters and you are ready to measure.

The cylinder menu offers a selection of the analog channel for each cylinder and allows you to define the alignment of the cylinder angles. In the engine setup section, additional injection channels and channels for transforming any input channel to angle based measurement can be selected.

The last step is to select the angle sensor type and define the desired output resolution (down to 0.1°). The TDC (Top Dead Centre) can be detected automatically, without firing, using the maximum pressure level or optionally with a dedicated TDC sensor.

When the configuration is complete you can select your desired calculation outputs. Overall or running-average, derivation, temperature, heat release, work, power are just some of the available possibilities.


Heat release

The online heat release calculates the energy for each cycle and its related parameters. Another calculation is the exact angular progression (5, 10, 50 or 90%) of the energy. The SOC (start of combustion) and EOC (end of combustion) are calculated. All these values are based on the heat release algorithm. The software displays all these values as well as the relevant mean values like IMEPg, PMEP, and IMEPn.

All the parameters can be visualized online in a graphical or in numerical view.

Knocking detection

Knocking on spark-ignition internal combustion engines occur when combustion of the air and fuel mixture do not start off correctly. The robust knocking detection algorithm is based on comparing the signal before and after the TDC.

Combustion noise

The combustion noise option allows the measurement of the noise level caused by an internal combustion engine during operation. The combustion noise must be calculated in the time domain.

First, the value is scaled from bar to Pascal. This is followed by the U-filter, which simulates the transfer function of the engine (1. and 2. filter in the overview).

Additional math and statistics

Additional mathematics channels can be defined based on the acquired or data:

  • math formulas,
  • statistics,
  • filters (FIR, IIR, ...)
  • FFT's,
  • alarm conditions and
  • many others.

Calculated values may be used for optimization or other automated procedures. RAW data from sensors will always be stored and stayed intact. See Dewesoft X analysis for more information.

All the calculated parameters

Most of the calculated parameters are available as cylinder and engine averaged results.

Group Name Description
Pressures MAX P Peak pressure value
  MAP P Pos Peak pressure position (degrees)
  Pressure Current pressure cycle
Derivates MAX D Peak pressure derivate
  MAX D Pos Peak pressure derivate position
  Derivate Current pressure derivate
Volume Volume Cylinder volume curve
Zero correction P CORR Zero correction factor for pressures
MEP PI Work delivered over the piston over engine cycle
  PIH Work performed by cylinder gasses on the piston during the compression and expansion
  PIL Work performed by the piston during exhaust and induction
Work, power, torque Work Work [Joule]
  Power Power [kWh]
  Torque Torque [Nm]
Heat release I5, I10, I50, I90 Position at the heat release at 5, 10, 50 and 90% [deg]
  IXX Position at the heat release with user-defined % [deg]
  SOC Start of combustion [deg]
  EOC End of combustion [deg]
  TQ Heat release during combustion
  TI Integrated heat release
Knocking KF Knocking factor
Injection SOI Start of injection
  EOI End of injection


Post processing

Since all the RAW data from the sensors is stored in the data file you can apply all the mathematics easily later in post-processing.This allows delaying CPU intense calculations until after the measurement has finished.

The stored data can easily be export to a variety of formats compatible with today‘s most popular analysis software package like FlexPro®, MATLAB®, Excel®, AVL CONCERTOTM and many more. You can even export the whole measurement view to an AVI video file to create dynamic documentation or print a PDF report.

The data file can be viewed and analyzed on as many computers as needed without the need to purchase any additional software license form us. You can also distribute the data file outside of your company (e.g your customers) and anyone can view, reply and apply additional analysis. Simply let them download Dewesoft X software and open the shared data file.

Free Online Training

You can learn more about sound level measurement at Dewesoft PRO online training by navigating to the Combustion Analysis PRO training course.

Dewesoft PRO training is a free online training for measurement professionals. Learn how to measure signals, data processing and how to use Dewesoft products. Online PRO training is completely free.

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