TLE4963-2M datasheet(20/91 Pages) INFINEON

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XENSIV™ sensors in

hybrid powertrains

Breakdown of position errors by category

Systematic errors are compensated for by the engine con-

trol unit and are not included in the above list. They include

signal propagation delays, which are already accounted for

in the control unit’s timer.

All of the components listed above result in a random error,

which at best resolves itself but, at worst, can represent a

massive fault. To meet the accuracy requirements of to-

day’s systems, modern sensors allow switching thresholds

to be individually set. The module manufacturer can do this

at relatively low cost by individually calibrating the switch-

ing point of the module at the end of the production pro-

cess. It can also be done on the dry engine itself at a slightly

higher cost.

The benefit for the car manufacturer here is that the cali-

bration also compensates for their own production toler-

ances. In contrast, the tier 1 supplier can only compensate

for the module itself; the OEM’s installation error is not

mitigated at all.

A cost-benefit analysis for the required tolerances and

resulting calibration cost is advisable.

The actual calibration process is very simple:

At a mid-point in the switching threshold, suitable systems

are used to measure the misalignment between the me-

chanical center of the tooth and the actual electrical edge.

After this, the systematic errors are subtracted and the

remaining offset is programed and permanently stored in

the sensor as the programmable switching threshold.

As shown in figure 6, this method can be used to eliminate

nearly all sources of error and improve the overall accuracy

from ±0.6° camshaft to ±0.1° camshaft.

Summary

The combustion engine has had its day. From 2020 to 2025,

all major car manufacturers worldwide will develop and

launch their last hybrid platforms. After this, even the last

remaining development engineers working on combustion

engines and possibly also transmissions will have to find

a new home in the emerging fields of fuel cell, battery and

electric drive technologies.

The combustion engines developed today will be around

for several decades to come. As such, it is vital that the

technology used in these models is reliable, long-lasting,

and up to date. Luckily, the challenges that hybrid engines

and, in particular, crankshaft and camshaft sensors face in

these systems are already known and being successfully

addressed by Infineon.

Overview of Infineon XENSIV™

crankshaft sensors

› TLE4929C-XAx – first-generation low-jitter, Hall-based

crankshaft sensor.

› TLE4929C-XVA – second generation includes several

further crankshaft protocols (by number 14) and a time

watchdog to overcome start-up vibrations. In addition,

this device is available with nickel plating for the first

time.

› TLE4929C-XHA – third generation includes an additional

dedicated hybrid watchdog and a new calibration feature

to meet increased absolute phase accuracy requirements.

TLE4963-2M Datasheet(PDF) 20 Page - Infineon Technologies AG

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