The air-fuel mixer of the patented GTI Bi-Fuel System, located downstream
of the gas power valve, incorporates a fixed venturi design.This innovative
mixer is installed such that all of the incoming air flows through
the mixer. For engines with multiple air intake systems,one mixer is
at each of the intakes. The GTI Bi-Fuel System uses mixing devices
that do not incorporate any type of air throttle plate in their design. After
exiting the mixing device, the air-gas mixture enters the engine air-intake
manifold, and distributes the charge to each cylinder via the normal
air distribution scheme of the engine.
GAS POWER VALVE
The gas power valve, located downstream of the gas pressure regulator,
is a needle-type valve and is one of the adjustable components to
the GTI Bi-Fuel System. This device is set during the tune-in phase
of the engine conversion and sets the maximum gas flow rate to the
engine.Once set, this valve remains in a fixed position regardless
of engine load.
Note: For added flexibility
on engines that operate over a wide spectrum of load levels, an optional,
automatically actuated gas trim valve is substituted for the gas power
valve.
GAS TRAIN
Conditioning and regulating the natural gas prior to admission into
the engine is a critical part of the GTI Bi-Fuel System system. The
system “gas train ” includes a 20-micron fuel filter, a
manual shutoff valve, an electrically operated solenoid valve actuated
in the event of an emergency or for system shutdown, and a zero-pressure,
demand-type gas pressure regulator. This latter component reduces
the inlet gas pressure (1–5 psi) to roughly atmospheric pressure.
With a negative outlet pressure, the design allows the system to use
a “demand ” control scheme whereby engine intake airflow
determines the gas flow of the engine. As engine load changes, corresponding
changes in intake air volume automatically draw additional fuel into
the mixer.
CONTROL PANEL
The Control Panels are based on proven Altronic controllers and provide state-of-the-art engine control and safety shutdown
monitoring. The system is designed specifically for GTI Bi-Fuel
applications and is straight-forward and easy to operate. The panel monitors
a number of pressure and temperature points and returns the engine to
100% diesel operation should any parameter deviate from its normal range.
In addition, an hourmeter function tracks the operating hours when in Bi-Fuel
mode.
Alarms are annunciated in English-language messages (other languages
can be programmed), and the controller maintains an alarm log of the
last 100 events.
cated downstream
of the gas power valve, incorporates a fixed venturi design.This innovative
mixer is installed such that all of the incoming air flows through
the mixer. For engines with multiple air intake systems,one mixer is
at each of the intakes. The GTI Bi-Fuel System uses mixing devices
that do not incorporate any type of air throttle plate in their design. After
exiting the mixing device, the air-gas mixture enters the engine air-intake
manifold, and distributes the charge to each cylinder via the normal
air distribution scheme of the engine.
to
the GTI Bi-Fuel System. This device is set during the tune-in phase
of the engine conversion and sets the maximum gas flow rate to the
engine.Once set, this valve remains in a fixed position regardless
of engine load.
ff valve, an electrically operated solenoid valve actuated
in the event of an emergency or for system shutdown, and a zero-pressure,
demand-type gas pressure regulator. This latter component reduces
the inlet gas pressure (1–5 psi) to roughly atmospheric pressure.
With a negative outlet pressure, the design allows the system to use
a “demand ” control scheme whereby engine intake airflow
determines the gas flow of the engine. As engine load changes, corresponding
changes in intake air volume automatically draw additional fuel into
the mixer. 
of pressure and temperature points and returns the engine to
100% diesel operation should any parameter deviate from its normal range.
In addition, an hourmeter function tracks the operating hours when in Bi-Fuel
mode.