TLE4963-2M datasheet(16/91 Pages) INFINEON

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XENSIV™ sensors in

hybrid powertrains

New challenges for engine sensors in

hybrid powertrains

The prospect of emissions penalties as of 1 January 2021 is

prompting many manufacturers to switch to lower-carbon

drive systems. Electric cars have become a key talking point

on everyone’s agenda – especially in California, where a

very promising startup recently (February 2020) secured a

higher market capitalization than the biggest European car

manufacturer.

But there is a wide playing field between conventional

combustion engines and all-electric cars, presenting less

radical pathways towards achieving the EU fleet-wide av-

erage emission target for new cars of 95 g CO2/km. Scaling

from models with a 12 V belt starter generator through in-

tegrated 48 V starter generators to high-power 400 V drives,

hybrid cars have the potential to drastically reduce noise in

urban areas.

Combustion engines in these hybrid cars face a number

of specific challenges when the car is being driven by the

electric motor. We will be taking a closer look at them in

this article. Time to explore the many additional functions

a single crankshaft sensor has to fulfill in a hybrid motor…

Car manufacturers across the globe are expanding their

portfolio of drive systems. Even looking beyond the fuel

cells and synthetic fuels of tomorrow, there is still a huge

number of hybrid options spanning the gap between com-

bustion engines and electric motors.

These options range from stop-start combustion engines,

where the motor shuts off for a few seconds at a red light

and then cold starts, to plug-in hybrids that can easily drive

50 kilometers in all-electric mode before the combustion

engine kicks in as the battery runs low or the vehicle is

travelling at high speeds on a highway.

Two different implementations of even the most recent

stop-start systems have already been brought to market.

In one instance, the combustion engine starts again as if it

had not been driven for an hour. The second solution mon-

itors the movement of the engine as it comes to a stop, so

when the engine starts up again, the car already knows the

position of the crankshaft and the next cylinder to be fired.

If we look at the starter generator attachment points on the

drive shaft, or the points where the clutch connects differ-

ent motors to the drive axle, we quickly see that the com-

bustion crankshaft assembly options are virtually limitless.

TLE4963-2M Datasheet(PDF) 16 Page - Infineon Technologies AG

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