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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 and NI
9201 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 9201 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 four NI 9201 analog inputs can be assigned to the rail pressure control feedback via the
Summary of Contents for NI DIDS-2103
Page 11: ...NI DIDS 2100 Series User Manual National Instruments 11 3 2 Software...
Page 32: ...32 ni com NI DIDS 2100 Series User Manual...
Page 40: ...40 ni com NI DIDS 2100 Series User Manual 3 3 Hardware...
Page 44: ...44 ni com NI DIDS 2100 Series User Manual 3 3 3 Connecting Injectors Sensors and Actuators...
Page 174: ...174 ni com NI DIDS 2100 Series User Manual Aux PWX 2 4 See above descriptions...
Page 210: ...210 ni com NI DIDS 2100 Series User Manual 12 Connecting Port Fuel Injectors to the PFI Driver...
Page 214: ...214 ni com NI DIDS 2100 Series User Manual 16 9066 RS 232 Serial Connector to TDK Power Supply...
Page 216: ...216 ni com NI DIDS 2100 Series User Manual 8 Important Information...
Page 223: ...NI DIDS 2100 Series User Manual National Instruments 223...