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FUEL TEMPERATURE SENSOR [2 records]

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Alphabetical list of terms

Record 1 2017-12-29

English

Subject field(s)
  • Exhaust Systems (Motor Vehicles)
  • Anti-pollution Measures
CONT

The oxygen sensor(also known as an O2 sensor, lambda sensor, or EGO sensor) is one of the most critical sensors on a fuel-injected engine. It resembles a spark plug and is located in the exhaust manifold between the turbo and catalytic converter. When at operating temperature it becomes a miniature battery which generates a voltage based on the differential between the oxygen content of the exhaust gas and the oxygen content of the ambient air. By this method it measures the amount of oxygen in the exhaust stream, allowing the ECM to compensate to some degree for various fuel grades, engine wear, altitude changes, usage of oxygenated fuel, and more. Another big benefit is the ability to keep emissions of carbon monoxide, oxides of nitrogen, and unburned hydrocarbons as low as possible.

OBS

oxygen sensor: term officially approved by the Lexicon Project Committee (New Brunswick).

French

Domaine(s)
  • Échappement (Véhicules automobiles)
  • Mesures antipollution
CONT

La consommation de carburant et l'émission de gaz polluants peut être drastiquement réduite en ajustant aussi précisément que possible le mélange air/essence qui alimente le moteur. Le dosage optimum (14.7 kg d'air pour 1 kg de carburant) correspond à l'indice 1 d'un coefficient arbitrairement choisi, appelé Lambda; ce mélange est aussi appelé stœchiométrique. Afin de mesurer précisément ce dosage, un capteur d'oxygène est placé en sortie de moteur, avant le catalyseur. Ce capteur est relié au calculateur (ECU), et renseigne en permanence ce dernier sur la proportion de dioxygène (O2) à l'issue de la combustion du mélange air/essence. Si le mélange est pauvre, le dioxygène est en excès et vis versa.

OBS

capteur d'oxygène : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).

Spanish

Save record 1

Record 2 2002-09-10

English

Subject field(s)
  • Exhaust Systems (Motor Vehicles)
  • Anti-pollution Measures
OBS

Because the O2 sensor must be pre-heated to function, many newer units contain a little 12 volt heater that brings it up to temperature sooner, offering better fuel economy and driveability earlier. These sensors can be identified by the number of wires coming out of the unit. Just one wire means you don’t have a heater. Those that have three wires use one for the signal, and two for the heater circuit. Those that have four wires use one for the signal, one for the signal' s ground, and two for the heater. In this case usually the signal wire is shielded against interference, much like common television coaxial cable.

OBS

Most engines with a turbo use sensors with heaters because the turbo steals so much of the superheat energy as it uses it to pump additional air in the intake. Without the heater, the sensor should not get hot enough to give good readings, especially when the turbo is being used. The Suzuki 1.0 liter engines unfortunately do not employ a lambda sensor with a heater.

French

Domaine(s)
  • Échappement (Véhicules automobiles)
  • Mesures antipollution
OBS

Pour compléter la sonde, on peut ajouter un élément chauffant central en céramique PTC de manière à assurer une mise à température de fonctionnement plus rapide (20 à 30 secondes). Sur une sonde non chauffée, ce temps est quasiment le triple car on compte uniquement sur la température des gaz d'échappement pour porter la sonde à la température correcte. Dans ce cas, la position de la sonde sur la ligne d'échappement est encore plus délicate à déterminer. [...] La différence entre une sonde chauffée et une non chauffée se situe bien entendu dans la rapidité de mise en activité mais aussi dans la durée de vie. Ainsi les fabricants estiment la durée de vie à 80000 km pour une sonde non chauffée et à 160 000 km pour une sonde chauffée. Par ailleurs, la conception actuelle des moteurs donnant en finale de faibles débits de gaz au ralenti avec des températures basses, l'utilisation de sondes chauffées est préférable.

Spanish

Save record 2

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