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Figure 2: Direct Acting Electronic Pressure Regulator
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It is a continuous fuel flow device. This allows the most homogeneous mixture of air and fuel to the
engine yielding optimum combustion with minimum emissions and maximum fuel economy.
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It operates on low pressure fuel from 6 to 20 inches of water of inlet pressure, no pressure
intensification system required.
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It does not wear in the case or dry fuels (NG) and it does not stick or clog due to heavy hydrocarbons
or waxes found in LPG.
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It is fast and accurate, providing precise air/flow ratio control during transients (or load acceptance).
The DEPR is a single-stage microprocessor based electromechanical fuel pressure regulator that
incorporates a high speed actuator. It communicates with the Engine Control Module (ECM) over a
Controller Area Network (CAN) link, receiving fuel pressure commands and broadcasting DEPR operating
parameters back to the ECM. The DEPR can regulate fuel pressure b/- 17 inches of water
column above the Mixer air inlet pressure, providing sufficient control authority to stall an engine either
rich or lean. When the DEPR receives an output pressure command from the ECM, the valve is internally
driven to attain targeted fuel pressure, the DEPR then closes the loop internally using a built in fuel
pressure sensor to maintain target fuel pressure/fuel flow rate, until another external command from
the ECM is received.
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