Operation Section
1
–
27
9. VARIOUS TYPES OF CONTROL
9.1 Outline
z This system effects fuel injection quantity and injection timing control more appropriately than the mechanical governor and timer
used in the conventional injection pump. The engine ECU performs the necessary calculations in accordance with the sensors installed
on the engine and the vehicle. It then controls the timing and duration of time in which current is applied to the injectors, in order to
realize both optimal injection and injection timing.
9.2 Fuel Injection Rate Control Function
z Pilot injection control injects a small amount of fuel before the main injection.
9.3 Fuel Injection Quantity Control Function
z The fuel injection quantity control function replaces the conventional governor function. It controls the fuel injection to an optimal
injection quantity based on the engine speed and accelerator position signals.
9.4 Fuel Injection Timing Control Function
z The fuel injection timing control function replaces the conventional timer function. It controls the injection to an optimal timing based
on the engine speed and the injection quantity.
9.5 Fuel Injection Pressure Control Function (Rail Pressure Control Func-
tion)
z The fuel injection pressure control function (rail pressure control function) controls the discharge volume of the pump by measuring
the fuel pressure at the rail pressure sensor and feeding it back to the ECU. It effects pressure feedback control so that the discharge
volume matches the optimal (command) value set in accordance with the engine speed and the injection quantity.
To Next Page
Loading...