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An oxygen sensor (or lambda sensor, where lambda refers to air–fuel equivalence ratio, usually denoted by λ) or probe or sond, is an electronic device that measures the proportion of oxygen (O 2) in the gas or liquid being analyzed. [1] It was developed by Robert Bosch GmbH during the late 1960s under the supervision of Günter Bauman. [1]
MAF sensor (idle trim) - 23 unk: Left lambda sensor: Blue shielded 24 unk: Right lambda sensor: Blue shielded 25 red/black: Sensor ground: Ground side of coolant, fuel, MAP, and TP sensors 26 green/white: Air bypass valve: 48-58Ω to pin 1 27 black/gray: Signal ground - 28 blue/gray: Air bypass valve: 48-58Ω to pin 29 29 orange: Air bypass ...
Most CO sensors are fully calibrated prior to shipping from the factory. Over time, the zero point of the sensor needs to be calibrated to maintain the long term stability of the sensor. [5] New developments include using microelectromechanical systems to bring down the costs of this sensor and to create smaller devices. Typical sensors cost in ...
Retrieved from "https://en.wikipedia.org/w/index.php?title=Lambda_probe&oldid=17306987"This page was last edited on 23 May 2005, at 02:38 (UTC). (UTC).
MAF sensor in a 2006-2015 automotive diesel engine. A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its ...
Mono-Jetronic always had adaptive closed-loop lambda control, and due to the simple engine load sensing, it is heavily dependent on the lambda sensor for correct functioning. The ECU uses an Intel 8051 microcontroller , usually with 16 KB of programme memory and without advanced on-board diagnostics (OBD-II became a requirement in model-year 1996.)
A special form of the Pirani gauge is the pulsed Pirani vacuum gauge where the sensor wire is not operated at a constant temperature, but is cyclically heated up to a certain temperature threshold by an increasing voltage ramp. When the threshold is reached, the heating voltage is switched off and the sensor cools down again.
MAP sensor data can be converted to air mass data by using a second variable coming from an IAT Sensor (intake air temperature sensor). This is called the speed-density method. Engine speed (RPM) is also used to determine where on a look up table to determine fuelling, hence speed-density (engine speed / air density).