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62 | ni.com | NI EDIDS-2400 Series User Manual
3.4 Using DI Driver System to Control Fuel Pressure
The DI Driver System supports a common rail pressure control feature with optional NI 9758 PFI Driver (available
Optional NI 9155 Expansion Chassis
) and NI 9220 analog input modules. A typical common rail high pressure
fuel system consists of a high pressure, cam-drivven pump, connected to a fuel rail which supplies fuel to each
injector. The high pressure pump has an Inlet Metering Valve (IMV) which is a solenoid proportional valve that
meters the fuel to the inlet of the pump. The IMV is controlled with a lowside driver channel via PWM operation. The
fuel rail has a pressure sensor connected to the end, providing analog pressure feedback to the NI 9220 analog
input module for rail pressure PID control. The rail pressure PID control function generates a PWM duty cycle to
maintain a specified rail pressure setpoint.
Some common rail fuel systems will have a High Pressure Valve (HPV) on the rail as a bleed valve to provide fuel
flow through the system for stable pressure control. The HPV is also a proportional solenoid valve controlled with a
lowside driver channel via PWM operation.
Refer to the
Rail Pressure Control Setup window
for details about configuring the rail pressure control function.
Typical IMV and HPV solenoids require up to 3A continuous current operation. Therefore it is important to utilize
the LS channel locking feature which locks LS1 with LS2 and locks LS3 with LS4 via the
. The locked channel pairs can be used to operate the IMV and HPV with up to 3A continuous current. Figure
3.4.a shows an example wiring diagram for wiring an IMV to a locked LS1 and LS2 pair, and wiring a HPV to a
locked LS3 and LS4 pair.
Any of the NI 9220 analog inputs can be assigned to the rail pressure control feedback via the
Summary of Contents for NI EDIDS-2400 Series
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Page 241: ...NI EDIDS 2400 Series User Manual National Instruments 241 Aux PWX 2 4 See above descriptions...
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