11
TEBS E
Workshop notes
186
11.4 Tests / Simulations
What is to be tested? What must be done?
Response time test
Response time < 0.44 s.
There are no requirements for the trailer regarding actuating
time.
Regulations:
98/12/EC Annex III
ECE R 13, Annex 6
With CTU: Preparations
•
Set LSV to ‘laden’.
•
If necessary, set the brake close.
Power consumption by ABS - equivalent actuations
Based on the number of equivalent actuations (n
e
) from the
ABS certificate (§ 2.5), there must still be pressure in the
cylinder for a 22.5 % deceleration at the last brake actuation.
Disc brake:
n
e
_EC = 11 actuations
n
e
_ECE = 12 actuations
Drum brake:
n
e
_EC = 11 actuations
n
e
_ECE = 13 actuations
Regulation:
98/12/EC Annex XIV
•
Fill the trailer reservoir to 8 bar.
•
At the yellow coupling head with 6.5 bar, brake with the
number n
e
.
•
Shut off the supply.
•
During the last actuation, maintain pressure and measure
the cylinder pressure.
Power consumption by spring-type brake actuator
Demonstrate whether the parking brake of the unhitched
vehicle can be released at least three times.
Regulations:
98/12/EG Annex V, § 2.4
ECE R 13, Annex 8, § 2.4
•
Support axle(s) with spring-type brake actuator on blocks.
•
Charge the trailer to 6.5 bar supply pressure (7.5 bar for
ECE acceptance).
•
Unhitch the vehicle.
•
Release automatic braking (black button).
•
Vent and charge air into the parking brake system (spring-
type brake actuator) three times by pressing the red but-
ton.
•
It must still be possible to turn the wheels with spring-type
brake actuators.
Start of braking of spring-type brake actuators
Demonstrate that the start of braking of spring-type brake
actuators is not greater than the supply pressure after 4 com-
plete actuations.
Regulations:
98/12/EG Annex V, § 2.5
ECE R 13, Annex 8, § 2.5
•
Turn ignition off.
•
Support axle(s) with spring-type brake actuator on blocks.
•
Shut off the supply.
•
Charge the trailer to 6.5 bar supply pressure (7 bar for
ECE acceptance).
•
Vent and charge air into the parking brake system (spring-
type brake actuator) by pressing the red button until a
wheel with a spring-type brake actuator can no longer be
turned.
•
Measure the supply pressure.
•
Charge the trailer back up to 6.5 bar reservoir pressure
(7 bar for ECE acceptance).
•
Use coupling head to completely actuate 4 times.
•
Measure the supply pressure.
The reservoir pressure at the start of braking of the spring-
type brake actuators must be less than the supply pressure
after 4 complete actuations.
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