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Outline
Description
This specification is for a dual fuel Diesel / Natural Gas controller
which enables a diesel engine to be fuelled with up to 90% natural gas
and 10% diesel. The cost of fuel is often much reduced depending on the
local market and also exhaust emissions are much less, often allowing
a dual fuelled engine to operate where diesel engines are banned because
of their emissions.
Mechanical
The controller is contained in cast and machined aluminium housing with
the sealed electrical connector on the lower surface. The housing is sealed
with “O” rings and is dust and waterproof. A hose-tail connector
is provided for the Inlet Manifold Pressure.
| Size | 220 x 230 x 70 mm |
| Weight | 2.3 Kg |
| Connector Deutsch | DRC 23 |
| IMAP Hose tail | 5 mm ID hose |
| Mounting holes | 4 on 217 x 141 mm grid |
Electrical
| Signal Inputs | Range | Typical Transducer measuring range |
| Inlet Manifold Pressure (A pneumatic signal) |
0 to 250 Kpa Absolute | |
| Storage pressure Transducer | 0.5 to 4.5 Volts | 0 to 25 Mpa |
| Gas Delivery Pressure | 0.5 to 4.5 Volts | 0 to 690 Kpa Absolute |
| Inlet Manifold Temperature | 0.5 to 4.5 Volts | -100 to +100 Degrees C |
| Gas Delivery Temperature | 0.5 to 4.5 Volts | -100 to +100 Degrees C |
| Engine coolant temperature | 0.5 to 4.5 Volts | 0 to 120 Degrees C |
| Drivers demand pedal | 0.5 to 4.5 Volts | 0 to 100% |
| Engine knock | 0.5 to 4.5 Volts | Knock sensing DSP chip |
| Substitution / Storage switch | 0 to 5V | Logic level with pull up |
| Record event switch | 0 to 5V | Logic level with pull up |
| Air conditioning switch | 0 to 5V | Logic level with pull up |
| Rack Stop Switch | 0 to 5V | Logic level with pull up |
| Outputs | ||
| Proportional Gas valve | 0V to supply Volts | 10 A 0 to 10 grams per second |
Gas lockoff solenoid on / off |
Supply Voltage | 2 Amps Regulated or HP gas |
| Error LED | Supply Voltage | 1K Ohm For drivers display |
| Out of gas LED | Supply Voltage | 1K Ohm For drivers display |
| Spare | Supply Voltage | 1K Ohm For drivers display |
| “Flowing gas” LED | 0 to Supply Voltage | External current limit reqd |
| Diesel rack stop stepping motor | Supply Volts switching 1A Current limit | 2 phase Stepping motor |
| IMAP Throttle control stepping motor | Supply Volts switching 1A Current limit | 2 phase Stepping motor |
| Environment | ||
| Supply Voltage | 12 or 24 Volts (5 ma with ignition off) |
Provides power for orderly shut down. |
| Ignition switch input | 12 or 24 Volts | Provides current to gas valve and shutoff solenoid |
| Load dump over Voltage protection | 100 Volts Continuous 1000 Volts for 10 us |
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| Ambient Temperature | -20 to 50 degrees C | |
| Protection | IP 67 | |
| Mounting Location | Vehicle body or chassis |
Designed
and manufactured by: Solid State Equipment
Ltd, Lower Hutt, New Zealand
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