Digital turbo MAP sensor calculates air-fuel ratio

At the Sensor+Test show next week, Infineon will present the Xensiv absolute pressure sensor series KP276. It is designed for applications such as the measurement of manifold air pressure (MAP) in aspirated or turbo (turbo MAP) diesel and gasoline engines and exhaust gas recirculation. The digital sensor covers 10 to 400kPa.

The MAP is an important parameter to calculate the air-fuel ratio provided to an engine. Precise measurement helps increase combustion efficiency and reduce harmful emissions. Manifold pressure data can be used to compute diagnostics of leakages and malfunctions of the exhaust gas recirculation valve, adds Infineon.

The Xensiv KP276 sensors have an accuracy error of 0.77 per cent (full scale span or FSS) over its lifetime, making them the most accurate digital turbo MAP sensors in Infineon’s portfolio. A 0.5 per cent FSS version which is ISO26262-ready is also planned. This will provide the analyses and documentation necessary for safety-critical applications.

Xensiv KP276 sensors integrate the signal processing for an external negative temperature co-efficient (NTC) temperature sensor. This allows them to provide both the pressure and the temperature signal on a single digital interface. The devices have a SENT interface with a short frame length of 846 micro seconds and a short NTC start-up time of typically 10 milli seconds.

The sensors are supplied in a robust SMD-8 package and are qualified for a temperature range from -40°C to 150°C and protected against aggressive media like iodine and exhaust gas condensate.

The Xensiv KP276 series is available now.

Visit Infineon at Sensor+Test 2019, Nuremberg (25 to 27 June 2019) Hall 1, Booth 429.

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