TE - White Papers

Sensors for the Connected Car TE AUTOMOTIVE /// White Paper Seite 8 peaks of up to 200 bar, and features a burst pressure of greater than 500 bar. Overall the sensor delivers an accuracy in the range of ±2%. The innovative semiconductor strain gage uses Krystal Bond technology to achieve its high level of robustness. As a result the sensor's proof pressure is at least twice the operating pressure, making the sensor tolerant to pressure peaks. Packaged in a steel housing the lightweight component can be used oil-submersed and functions at operating temperatures between -40 °C and 140 °C. As a safety-relevant product the sensor is automotive safety integrity level (ASIL) B ready in the standard version and can meet ASIL C if required. The sensor output can either be an analog signal or a digital SENT signal. C | Battery monitoring via Hall effect current sensing Vehicle electrification poses new challenges to managing energy flows in the car. Ensuring a suf- ficient supply of electric energy to the vehicle board net, for instance, has a high priority. Mea- suring a battery's state of charge (SOC) and state of health (SOH) is therefore a key part of battery management solutions. Informa- tion on the SOC is also needed to activate the optimal hybrid operating strategy in a hybrid vehicle. An important safety feature in vehicles with a high-voltage electrified powertrain is a battery disconnect unit (BDU), which separates the battery from the vehicle net in case of a faulty current flow. Another use case is inverter control. TE offers two current sensor versions, based either on Hall sensing only, or on Hall sensing in combination with shunt measurement. Both sensor versions measure currents between -350 amps and +350 amps (i.e. both directions of current flow during either charging or discharging). However, different current operating ranges are also possible. They are designed for integration into the BDU. The operating tem- perature is -40 °C to 85 °C for both sensor versions. Interface options include analog, SENT, LIN and CAN. If required, both sensors can be sealed to an IP rating. The coreless Hall sensor measures the current flow via an open-loop Hall principle with an accuracy of 1.75 amps +1.5 % over the complete measurement range. It has 1 ms response time at the signal out. The integrated current sensor provides a redundant measurement as it combines the Hall sensing with a precise shunt (low-resistance path). At 25 °C the integrated Hall sensor has an accuracy of 1% of the current measurement value. An additional NTC temperature measurement is part of shunt temperature compensation. This sensor is already being used within a series passenger vehicle application as part of current flow monitoring in a 48 volt mild hybridization. Integrated current sensor (l) and coreless current sensor (r)

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