TLE4963-2M datasheet(18/91 Pages) INFINEON

18 / 91 page

XENSIV™ sensors in

hybrid powertrains

fications to the architecture of a combustion engine. All it

requires is a slightly larger starter battery and starter motor

and modifications to the software in the controller.

Diagram of the crankshaft coming to rest when ignition is

shut off [1]

Figures 2 and 3 show how the disengaged crankshaft

comes to a stop when the ignition is turned off as well as

the quickest possible start for an Otto engine when com-

pressed air is still in the cylinder (known as a direct start).

Diagram showing how a crankshaft starts turning again

after a direct start [1]

Vibrations while stationary

Modern cars carry out a range of self-diagnostic checks

as soon as the driver’s door is opened. This reduces the

amount of time it takes for a warning lamp to light up. A lot

of other things can happen, however, from the moment the

car door is opened to the time the car pulls away. The car

can be loaded, for example, or children have to be buckled

into their seats. As such, it is completely normal for the car

to rock slightly while stationary. These slight movements

travel through the drive wheels, transmission and clutch

and cause the crankshaft trigger wheel to turn. In some un-

fortunate situations, this can result in the crankshaft sensor

picking up a valid magnetic signal.

To overcome this issue, an algorithm has been implement-

ed in the sensor to delete calibration data generated before

the engine is switched on.

If we take just a brief look at the wide range of hybrid archi-

tectures, it quickly becomes clear that this add-on function

will help car manufacturers to identify and ignore any

inaccurate calibration data.

Signal output by the crankshaft sensor when a car is

being loaded

As figure 4 shows, we can draw several conclusions from

the sensor’s output signals over time. Firstly, we can see

that the nominal rotational speed was not reached as soon

as the sensor was activated. Consequently, the calibration

data gathered up to the time where the nominal rotational

speed was achieved can be reset without difficulty. Sec-

ondly, we see that this procedure can be repeated multiple

times if the sensor does not identify a tooth for a certain

period of time.

Hybrid algorithm

A new function is required for a “big” plug-in hybrid solu-

tion. To correctly identify the position of the crankshaft

trigger wheel, an algorithm has been implemented in the

sensor that detects slower, sub-nominal crankshaft rota-

tion and, in conjunction with other monitoring functions,

prevents incorrect calibrations. New calibration data is only

accepted when the system is operating normally.

TLE4963-2M Datasheet(PDF) 18 Page - Infineon Technologies AG

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