Document ID: chunk:federal_register_of_legislation:F2007C00493:front:0:p16
Version: federal_register_of_legislation:F2007C00493
Segment Type: other
Provision Reference: 
Character Range: 44938–48069

BRAKE SYSTEM COMPONENTS
22.1.                                Sub-assemblies of 'Brake System' components may be 'Approved' by the 'Administrator' as part of the 'Brake System' approval process where information has been supplied in accordance with the requirements of the appropriate sub-paragraphs of clause 22.
22.2.                                'Control System'
22.2.1.                          The 'Control System' must be characterised by determining the 'Control System' ratio at not less than five points in the range of 'Control Signal' inputs at 0.2 'E' to 1.0 'E' . These points must be equally spaced except where the relationship within that range is non-linear, in which case the points must include each critical point
22.2.1.1.                    The 'Control System' ratio for each axle is Output Signal level as a percentage of 'Control Signal' level.
22.2.1.2.                    The input must be taken at the trailer coupling.
22.2.1.3.                    The output must be taken at the outlet end of the line to the service brake actuator.
22.2.2.                          The input signal strength must be the final value of the applied signal and must be applied to the 'Control System' such that it rises from zero to 65 percent of the final value in not more than 0.22 second. In the case of air 'Brake System's' the input 'Control Signal' strength (kPa) will be measured at the trailer 'Control Line' coupling.
22.2.3.                          The output signal strength must be the final value of the signal generated for control of the 'Brakes' actuator and which must be reached in not more than two seconds. The output signal strength will be measured in the actuator attached to each output having a fundamentally different relation to the input. In the case of air 'Brake Systems' a 'Control Signal' path having additional pressure limiters, relay valves or other active devices will be considered as being fundamentally different.
22.2.4.                          Time response must be measured where necessary in accordance with part 16.
22.2.5.                          Where the 'Control System' is not installed on an actual trailer, it must be installed in an essentially identical manner, in the laboratory, with all bends, fittings and worst case line lengths and representative actuator volumes installed.
22.2.6.                          For the application test, clause 16.8, the actuator displacement must be the largest volume for which the 'Control System' is designed and it may be represented by an equivalent fixed volume.
22.2.7.                          The release test, clause 16.9, must commence at an actuator displacement corresponding to the largest volume for which the 'Control System' is designed. Alternatively the actuators may be replaced by an equivalent fixed volume. The pressure 0.65 seconds after release must be 0.05 'E' (35.0 kPa) or less.
22.2.8.                          All relevant test conditions pertaining to part 10 must be complied with.
22.2.9.                          The relationship between brake actuator volume and stroke must be measured and