EngMod4T

Detailed Description

 

 

Engine Layouts

The current version of the software can simulate engines ranging from 1 to 16 cylinders with the following layouts:

  • Inline Engine
  • Vee Engine
  • Boxer Engine

A large number of firing orders are included and any special requests can be accommodated.

 

 

 

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:

  • Separate Inlets
  • Separate inlets with a common air box
  • Manifold Inlet Systems
  • All intakes can have: Throttle valves and/or boost bottles
  • Siamesed inlet port systems

  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:

  • Valve open BTDC
  • Lobe center
  • Valve lift at TDC
  • Lift center

The timing and the lift of the valves can be varied using VVT (variable valve timing) and/or VVL (variable valve lift).

 

Exhaust Systems

The available exhaust systems fall into three main classes:

  • Single Pipe per cylinder
  • Branch manifold
  • Log manifold

Each class can be further divided into the following types:

  • Open pipe - the main or collector pipe can be configured as an open pipe
  • Box pipe - the main or collector pipe has a box or plenum in it.
  • Silencer pipe - any one of the above pipes can terminate in a silencer.

There are also a range of special types:

  • V8 and V6 - two 4into2into1/4int1 with or without balance tube and the option of a X-connection on the outlet pipes.
  • I2 or V2 - two separate pipes with balance pipe and a 2into1into2 system.
  • I4 - 4into2into1 with various connection strategies and a choice of cross connecting tubes.

 

  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:

  • Valve open BBDC
  • Lobe center
  • Valve lift at TDC
  • Lift center

The timing and the lift of the valves can be varied using VVT (variable valve timing) and/or VVL (variable valve lift).

 

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):

  • Prescribed combustion depending on user input like the Vibe (Wiebe) values and the delay and combustion duration periods.

  • Turbulent entrainment combustion which uses turbulence modeling and mass entrainment into the flame front to model the combustion process.

     

  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).

 

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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