140-3 SERIES
11-69
STRUCTURE AND FUNCTION, MAINTENANCE STANDARD OUTLINE OF CRI SYSTEM
Controls
The CRI system control of the fuel injection amount and fuel injection timing is carried out more suitably than on
the mechanical governor and timer used in conventional fuel injection pumps.
The system control carries out the necessary calculation in the ECU from the signal from the sensors installed
to the engine and machine, and controls the timing and length of time that electricity is sent to the injector so
that it can carry out the optimum fuel injection at the optimum fuel injection timing.
1. Control function for fuel injection amount
The function to control the fuel injection amount replaces the conventional function of the governor. It functions
to control the fuel injection so that the optimum fuel injection amount is injected, based on the signal from the
engine speed and accelerator angle.
2. Control function for fuel injection timing
The function to control the fuel injection timing replaces the conventional function of the timer. It functions to
control the fuel injection so that the optimum fuel injection timing is carried out, based on the signal from the
engine speed and fuel injection amount.
3. Control function for fuel injection pressure (common rail fuel pressure control function)
The function to control the fuel injection pressure (common rail fuel pressure control function) measures the fuel
pressure with the common rail fuel pressure sensor. This function feeds back to the ECU and controls the
amount of fuel discharged from the fuel supply pump.
It controls the pressure feedback so that it matches the optimum value (command value) set according to the
engine speed and fuel injection amount.
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