System configuration of conventional
3. ECU and Others
Layout of Components (1HD-FTE E/G)
(1) Accelerator pedal position sensor
Detects the accelerator opening angle and the idling condition.
(2) Intake air temperature sensor
Detects the intake air temperature.
(3) Turbo pressure sensor
Detects the intake manifold pressure.
(4) Water temperature sensor
Detects the water temperature.
(5) Crankshaft position sensor
Detects the crankshaft angle reference position.
(6) Speed sensor
Mounted on the rotor cam of the pump, this sensor detects the engine speed and the cam angle of the pump.
(7) Fuel temperature sensor Detects the fuel temperature.
(1) EGR Valve (Exhaust Gas Recirculation Valve)
Control the inflow volume of the EGR gases.
(2) SPV (Spill Control Valve)
Controls the fuel injection volume.
(3) TCV (Timing Control Valve)
Controls the fuel injection timing.
3. ECU and Other parts
(1) ECU (Electronic Control Unit)
Determines the operating conditions based on the signals from various sensors and sends optimal engine control signals.
(2) EDU (radial plunger type pump only)
Amplifies the ECU signals and actuates the SPV.
Pumps and distributes fuel.
(4) Fuel filter and sedimenter
Removes foreign particles and water from fuel.
(5) Injection nozzle
Injects fuel that has been pumped by the pump.
4. Flow of fuel and signals in conventional EFI-diesel
(1) Flow of fuel
The feed pump inside the pump draws up fuel from the fuel tank into the pump. The fuel is pressurized by the pump and distributed to the injection nozzle of each cylinder. The fuel pressure causes the injection nozzle to open injecting fuel into the cylinder.
(2) Flow of signal
The ECU receives signals from various sensors in order to determine the operating conditions of the engine. Then, the ECU sends signals to control the SPV and TCV in the pump in order to achieve an optimal fuel injection volume and timing.
HINT: The fuel return circuit from the injection nozzle or injection pump is not illustrated at left, but the fuel return circuit is attached to the actual fuel system. (5/5)