Pretensioner Loading to Rear-Seat Occupants During Static and Dynamic Testing

Figures & data

Table 1. Sled test matrix^a

Dummy	Pret.	Booster
HIII3y	—	Booster with back
HIII3y	PI	Booster with back*
HIII3y	PII	Booster with back
HIII3y	PI	Booster cushion
HIII6y	—	Booster with back
HIII6y	PI	Booster with back*
HIII6y	PII	Booster with back
HIII6y	PI	Booster cushion
HIII5th		NA
HIII5th	PI	NA
HIII5th	PII	NA
HIII50th	—	NA
HIII50th	PI	NA
HIII50th	PII	NA

^aTests marked with an asterisk were repeated once.

Fig. 1. Shoulder and lap belt forces for pretensioner I and pretensioner II for the HIII3y seated on booster with a back.

Fig. 2. The Q10 test positions: (a) normal sitting posture on BC, (b) out-of-position with lap belt above the guiding loops, (c) normal sitting posture directly on the car seat, and (d) slouching posture (out-of-position) directly on the car seat.

Fig. 3. Figures show whether head excursion and loading to the neck and chest increased (arrow up) or decreased (arrow down) with a pretensioner, compared to tests without a pretensioner for child and adult ATDs. (a) Includes pretensioner I and child ATDs positioned on booster with back, (b) includes tests with pretensioner II and child ATDs positioned on booster with back, and (c) includes tests with pretensioner I and child ATDs positioned on booster without back. The circle indicates loading exceeding IARV.

Table 2. Loading to the neck and chest at pretensioner peak and at crash peak for all sled tests, difference in max head excursion relative the test without pretensioner, as a function of different ATDs and different pretensioners

			At pretensioner peak				At crash peak
			Upper Neck Tension	Upper Neck Ext.	Chest defl.	Shoulder belt force	Upper Neck Tension	Upper Neck Flexion	Chest defl.	Diff. in max head excursion relative test without pretensioner	Shoulder belt force
Dummy	Pret.	Booster	N	Nm	mm	kN	N	Nm	mm	mm	kN
IARV HIII3y			1380	17	28		1380	42	28
HIII3y	-	BCwB	-	-	-	-	587	10	28	-	2.4
HIII3y	PI	BCwB	296	8	34	2.9	512	8	28	82	2.2
HIII3y	PI	BCwB	359	7	34	2.9	521	8	30	87	2.2
HIII3y	PII	BCwB	150	5	20	1.5	519	7	30	79	2.4
HIII3y	PI	BC	121	−1	11	3.2	526	7	28	-	2.3
IARV HIII6y			1820	24	31		1820	60	31
HIII6y	-	BCwB	-	-	-	-	696	22	28		2.6
HIII6y	PI	BCwB	403	9	26	2.3	579	15	34	67	2.5
HIII6y	PI	BCwB	363	13	26	2.9	592	15	35	69	3.0
HIII6y	PII	BCwB	200	5	17	1.6	553	16	34	60	2.9
HIII6y	PI	BC	239	4	18	3.0	626	18	31	-	2.3
IARV HIII5th			2070	39	41		2070	95	41
HIII5th	-	-	-	-	-	-	870	34	26	-	3.5
HIII5th	PI	-	365	13	12	2.9	526	25	20	82	3.0
HIII5th	PII	-	197	8	8	2.0	495	23	20	85	3.1
IARV HIII50th			3290	78	50		3290	190	50
HIII50th	-	-	-	-	-	-	793	46	30	-	3.8
HIII50th	PI	-	454	12	12	2.3	511	29	28	88	3.2
HIII50th	PII	-	350	9	11	2.0	416	23	25	57	3.1

BCwB = Booster Cushion with Back.

Table 3. Loading to abdomen and chest in static pretensioner test with Q10, varying booster cushion (BC) or car seat and ATD position (normal or out-of-position)

		Abdominal pressure		Chest deflection		Belt force
		Left	Right	Lower	Upper	Shoulder	Lap
Booster	Seating position	(bar)	(bar)	(mm)	(mm)	(kN)	(kN)
BC	Normal	0.07	0.10	8	12	3.3	0.2
BC	Normal	0.08	0.13	9	13	2.9	0.1
BC	Out-of-position	0.10	0.18	6	12	2.2	0.3
Car seat	Normal	0.11	0.25	5	7	2.8	0.7
Car seat	Out-of-position	0.15	0.30	3	6	2.3	0.4