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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Hot water reset, also called outdoor reset (ODR), is an energy-saving automatic control algorithm for heating boilers that are typically fired with fuel oil or natural gas. A hot water reset control loop measures the outside air temperature ; this information is used to estimate demand or heating load as the outdoor temperature varies.
The light normally appears when the vehicle ignition is turned on, but the engine is not running, as it detects no oil pressure due to the oil pump not operating (the oil pump is powered off the crankshaft, so only operates when the engine is running). It normally turns off a few seconds after engine start as the oil pump starts working and ...
The switch shown to the right is intended to disable an electric fuel pump in automotive applications. This functionality is required in some vehicle racing applications, since an electric fuel pump may otherwise continue operating after a collision or rollover. If the fuel line is broken or the vehicle is inverted, fuel may be spilled ...
UK researchers at Loughborough University and the University of Sussex concluded that waste heat from light-duty vehicle engines in a steam power cycle could deliver fuel economy advantages of 6.3% – 31.7%, depending upon drive cycle, and that high efficiencies can be achieved at practical operating pressures.
Water can be introduced from the boiler or in a cold engine, steam will condense to water on the cool walls of the cylinders and can potentially hydrolock an engine. This is just as damaging as it is to internal combustion engines and in the case of a steam locomotive can be very dangerous as a broken connecting rod could puncture the firebox ...
Dieseling or engine run-on is a condition that can occur in spark-plug-ignited, gasoline-powered internal combustion engines, whereby the engine keeps running for a short period after being turned off, drawing fuel through the carburetor, into the engine and igniting it without a spark.
Wilcox's patent for a car heater, 1893. Margaret A. Wilcox (1838 – March 30, 1912) was an American mechanical engineer and inventor known for her late-nineteenth-century discoveries. The automotive heating system established the foundation for modern vehicle temperature control. She also contributed to the development of home appliance ...