
020-9905 User Manual Q3 (Advanced 3 year old child) Rev G Page 19 of 82
© 2016 Humanetics Innovative Solutions
3.5 Abdomen Pressure Twin Sensor (APTS)
Purpose
To measure loadings on the abdomen e.g. from CRS with shields or belt loading under
submarining. Injury criteria has been set under regulation R129.
See for example
reference
7
.
Description
The sensors are polyurethane bladders closed with an aluminium cap and filled with
fluid. See figure 8. The pressure generated in the bladder is measured via a sensor in
the cap. The sensor design was developed by IFSTARR and is sold by Transpolis SAS.
The bladders come in three sizes 30, 40 and 50 mm diameter. The 40 mm diameter is
used on Q3.
Figure 8.
40 mm APTS sensor
The APTS are mounted inside a special abdomen assembly part number 020-5005. This
part has two blind holes for the sensors parallel to the lumbar spine. The APTS are
inserted aluminium cap down and the sensor cables come out through small holes at
the base on the blind holes. The bladders are put into Lycra sleeves to reduce friction
with the abdomen and held in place with Velcro at the bottom of the hole. The abdomen
assembly is delivered with foam plugs to facilitate standard certification of the abdomen
as in section 8.4. The Lycra sleeves are not used with the foam plugs.
The APTS have a higher density than the removed standard foam so there is an increase
to the abdomen of around 163 grams.
7
ECE/TRANS/WP.29/GRSP/59/Add., Report of the Working Party on Passive Safety on its fifty-ninth
session, Addendum 1. Geneva, 9-13 May 2016.