Multi point injected natural gas

Converted dual fuel engines mix the natural gas with combustion air just before it enters the cylinder. This is done under moderate pressure, slightly higher than the boost pressure from turbocharger. Automatic adjustment of beginning and duration of gas admission provides desired gas volume and optimal flushing and cooling of cylinder by flow of filling air. Individual cylinder timing control enables steady engine operation.

Main features

  • Gas injection by electromagnetic valves
  • Each cylinder controlled individually
  • Precise timing
  • Quantity of gas (duration of gas valve opening) depends on required output and speed
  • Full electronic control
  • Equalisation of exhaust temperatures
  • Safety monitoring system

Components

  • Gas electromagnetic valves
  • Gas valve control unit
  • Gas train
  • Engine automatic control unit
  • Safety elements

Scheme

System Scheme [PDF, 56 kB]

Extent of modification

Installation of gas electromagnetic valves on each cylinder head or intake manifold

Connection of gas valves to gas supply via electronically controlled gas train

Additional pressure- and temperature- sensors (if necessary)

Magnetic pick-ups on camshaft and flywheel (where applicable)

Liquid fuel delivery blocking device

Electronic control unit

Safety explosion covers

Gas safety monitoring system

Advantages

Avoids gas losses to exhaust manifold

Gas is introduced to combustion space only, which limits risk of uncontrolled explosions

Enables higher liquid fuel substitute by gas

Engine's suitability

CES system has been developed for conversion of naturally aspirated and supercharged engines with speed below 1.000 rpm and output higher than 0,5 MW.

GEV animation [GIF]