2 heating devices are used depending on the engines
Дополнительный обогреватель
The purpose of this heating is to raise the temperature in the passenger compartment in low temperatures to compensate for the high efficiency of the direct injection diesel engines (HDI)
An additional heating element fuelled by diesel and fitted on the engine cooling system enables the heat to be supplied to the heater matrix
The injection ECU determines the heating requirement of the passenger compartment on starting (depending on the inlet air and the engine coolant temperature)
This injection ECU controls the starting of the heating element in the following conditions
- При работающем двигателе (в течение 60 секунд)
- Частота вращения вала двигателя выше 700 об/мин
- Напряжение аккумуляторной батареи больше 12 В (positive electric balance)
- Температура охлаждающей жидкости превышает -40 °c
The additional heating control ends in conditions where the temperature allows this (see graph example below)
A: зона авторизации предподогрева
Ta: температура воздуха на впуске
Te: температура охлаждающей жидкости
Cut-off of the heating element at 79 °C coolant temperature
Re-supply of the heating element at 64 °C coolant temperature
ПримечаниеDepending on the vehicle, conditions for triggering the additional heating may be different
Управление дополнительным отопителем
1320: снятие – установка
1723: реле управления системой дополнительного обогрева
1725: дополнительный обогреватель
Система подачи топлива
The heating element is supplied with diesel by a metering pump which is controlled by pulses from the heating element and located on the heating element support
The fuel is taken from the return pipes of the injection circuit
Контур охлаждающей жидкости
Циркуляция охлаждающей жидкости обеспечивается насосом системы охлаждения
Автономный обогрев
This type of equipment is fitted to electric vehicles because no heat is given off by the motor
Passenger compartment heating and windscreen de-misting and de-icing are via a heater matrix which is identical to a combustion-engined vehicle
The heat necessary to heat the coolant circulating in this matrix, is produced by a petrol fuelled heating unit
Independent heater control
Start-up is provided by a knob or a switch
For the driver, handling is similar to a traditional vehicle with only an indicator light - located either next to the knob or on the control switch - showing that the system has been started
Система подачи топлива
The petrol supply system is composed of the following
- The tank, placed under the right rear floor, has a capacity of approximately 10 litres, is filled via the conventional opening on the right rear wing with 95 or 98 unleaded petrol
- A metering pump controlled by pulses from the heating element
Flow continuity device
A safety device preventing draining of the fuel system automatically cuts off the heating element control when the fuel level is too low
The safety device is composed of the following
- Double sensor gauge incorporating a thermistor and a switch connected to a float
- Двойное реле
Работа
- When the fuel arrives at the thermistor a warning light comes on on the instrument panel (there remain approximately 0.5 litres to be pumped from the tank)
- When the float switches on the gauge switch, the double relay then starts to operate, which automatically cuts off the heating element control
- The heating stops (even though the control knob or push button are in the Operating position) and the heating operation indicator light goes out
- Operating the control again or switching the ignition off allows the heating to be started again temporarily
Контур охлаждающей жидкости
The fluid is circulated by an electric coolant pump controlled by the heating element; it is secured to the body of the heating element