EngMod4T Detailed Description |
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Engine Layouts The current version of the software can simulate engines ranging from 1 to 16 cylinders with the following layouts:
A large number of firing orders are included and any special requests can be accommodated. |
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Inlet Systems Most available inlet systems can be modeled, including variable length cylinder pipes. The following is a brief summary of the available inlet systems:
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Types of Inlet Ports and Cams The inlet can have from 1 to 3 inlet valves. The flow is controlled by Cd-maps depending on the amount of masking. The user can control the maps by means of multipliers or by modifying the maps using flow bench data. The software includes a valve lift curve utility to allow a quick means of generating a lift profile. Alternatively lift files generated by third party software or through measurement can be imported: 4stHEAD (of Prof Blair & Associates) static and dynamic valve lift files can be imported directly. MJPower Engineering has an economical lift profile design and measurement package available that can export a file directly into Dat4T. The timing can be specified by the following means:
The timing and the lift of the valves can be varied using VVT (variable valve timing) and/or VVL (variable valve lift). |
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Exhaust Systems The available exhaust systems fall into three main classes:
Each class can be further divided into the following types:
There are also a range of special types:
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Exhaust Ports and Cams The exhaust can have from 1 or 2 valves. The flow is controlled by Cd-maps depending on the amount of masking. The user can control the maps by means of multipliers or by modifying the maps using flow bench data. The software includes a valve lift curve utility to allow a quick means of generating a lift profile. Alternatively lift files generated by third party software or through measurement can be imported. 4stHEAD (of Prof Blair & Associates) static and dynamic valve lift files can be imported directly. MJPower Engineering has an economical lift profile design and measurement package available that can export a file directly into Dat4T. The timing can be specified by the following means:
The timing and the lift of the valves can be varied using VVT (variable valve timing) and/or VVL (variable valve lift). |
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Combustion Modeling Two types of combustion modeling is available and both are based on the typical two-zone model (a burnt and an unburnt zone):
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Turbocharger Modeling The current release allows for the modeling of a single turbocharger or parallel twin turbochargers with or without Charge air cooler (intercooler) and wastegate. Software is included to digitize the compressor and turbine characteristics.
Supercharger Modeling The current release allows for the modeling of a single supercharger with or without Charge air cooler (intercooler). Software is included to digitize the compressor characteristics. It can be either a centrifugal compressor or twin rotor type compressor (eg Roots).
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As part of the pre-processor, Dat4T, there is a utility to verify some of the design:
To use a compressor map as part of the simulation it has to be extrapolated into the surge region and to the negative (reverse) flow region. The following is an example of such a digitized and extrapolated map:
To use a turbine map as part of the simulation it has to be digitized. As it is very difficult to obtain a full turbine map, the software currently uses an approximation known as the "swallowing curve". The following is an example of such a digitized swallowing curve:
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