Блок-схема функционирования
P: потенциометр нагрузки
1104: электромагнитный клапан опережения
1208: топливный насос высокого давления
1320: компьютер управления двигателем
Электромагнитный клапан опережения (1104)
Назначение
The advance solenoid valve allows the advance control pressure to be measured from the transfer pressure
Описание
The advance solenoid valve in the open or closed position is controlled by the injection ECU, by modification of an OCR current
The advance solenoid valve is synchronised to the engine speed except during dead centre
Электромагнитный клапан закрыт: the leak off is nil and the transfer pressure is established behind the piston which moves and increases the advance
Электромагнитный клапан открыт: the leak-off is at maximum, the pressure on the advance piston is reduced and the spring pushes back the piston by reducing the advance
Частные случаи
Принадлежность клемм разъема 2V.NR
- Контакт 1: питание
- Контакт 2: управление электромагнитным клапаном опережения
Установка
The solenoid valve is located on the rear of the injection pump, under the hydraulic head
Потенциометр нагрузки
Назначение
The purpose of the load potentiometer is to transmit to the injection ECU a voltage signal depending on the load control lever position
Описание
The potentiometer is a resistor which varies and transmits a signal depending on the injection pump load lever position
Частные случаи
Принадлежность клемм разъема 3V.NR
- Контакт 1: питание (+5 V)
- Контакт 2: сигнал
- Контакт 3: масса
Установка
The potentiometer (1) is mounted on a support (2) which in turn is mounted at the rear of the injection pump cover
The potentiometer (1) is integral with the load lever (3)
Principle of regulation of the advance
Advance regulation mapping
This mapping allows the advance applied to be determined accurately in terms of the following criteria
- Position of the load lever
- Температура охлаждающей жидкости двигателя
- Температура воздуха на впуске
- Режим работы двигателя
- Положение коленчатого вала
- Injection start signal
The ECU makes a correction depending on the engine coolant temperature
Control of the advance is by a closed loop and the advance is adjusted dynamically by using the needle lift sensor signal
Depending on the various operating parameters, the injection ECU calculates the advance required and so determines a position for the cam
Modification to the advance occurs by means of the advance solenoid control which changes the pressure operating the advance piston
The injection ECU takes account on a permanent basis of the advance measured by the needle lift sensor
If there is a discrepancy between the advance required and the advance measured, the injection ECU makes an immediate correction
1104: электромагнитный клапан опережения
1260: датчик подъема иглы форсунки
1313: датчик частоты вращения двигателя
1320: калькулятор
A: информация двигателя
P: потенциометр нагрузки