| 摘要 |
<p>The heater receives a wake signal to commence heating and determines a parameter value indicative of a flow capability of a fluid to be heated. A start-up sequence is determined and initiated based upon the parameter value. The heater may be a fuel operated heater 18 supplied with fuel from a fuel tank 16 by a pump 20 arranged to heat coolant in a fluidic circuit C of a vehicle having an engine 8 and a HEVAC system 12. The parameter value may be the temperature of the coolant or ambient air, or the viscosity of the coolant. In extreme cold conditions the engine may need preheating and the viscosity of coolant may be elevated such that the coolant flows slowly and is overheated under normal operation of the fuel operated heater. To mitigate this, in extreme cold conditions the heater may open a valve 14 and pump less fuel to the fuel operated heater so that the engine is preheated and coolant overheating is prevented. The heater system may also be used to preheat a combustion engine of a portable heater.</p> |
