Document ID: chunk:federal_register_of_legislation:F2006L03060:body:0:p17
Version: federal_register_of_legislation:F2006L03060
Segment Type: other
Provision Reference: 
Character Range: 46349–49255

+ P2 + … etc

where :

e is values of 'E' in the range 0.2 - 1.0

C is the ratio of output to input signal strength for the 'Control System' for the 'Axle' concerned

T is the 'Brakes' output torque per unit input signal to the 'Brakes' actuator from the 'Control System' for the 'Axle' concerned

R is the rolling radius of the tyre on the wheel

P is the static load on the 'Axle' concerned

1,2, etc are subscripts referring to a particular 'Axle'.

38.4.1.4.1.              The calculated 'ERC' corresponding to a 'Control Signal' of 1.0 'E' shall be not less than 0.45. 38.4.1.5 The provisions of clause 38.3.3.5 (computer simulation allowed) also apply to clause 38.4.1 (service effectiveness calculation).

38.4.2.                          Service Brake Fade Calculation

The 'Service Brake System' shall be considered to have sufficient brake fade resistance to meet the requirements of this Rule if the fade resistance of the individual axles rated according to the dynamometer test in clause 38.3.8 and clause 38.3.10, or the road fade test in clause 38.3.2 and clause 38.3.4 is greater than the requirement of clause 38.2.2.5 (distribution of effort).

38.4.3.                          'Emergency Brake System' Calculation.

The 'ERC' for the 'Emergency Brake System' shall be determined by computing the total braking force at the wheels to which emergency brakes are fitted and dividing by the 'Total Trailer Axle Load'

38.4.3.1.                    The braking force at each 'Axle' shall be calculated according to

where:

F  is the tangential force at the braked wheels on the 'Axle' concerned

A  is the input to the emergency brakes actuator

T  is the ratio of output torque to input signal for the emergency brakes

R  is the rolling radius of the tyre fitted to the wheel.

In most cases this will be the same as for the 'Foundation Brakes'.

38.4.3.1.1.              Where the actuating force is dependent on the stroke, as in the case of spring brakes, the force used in the equation above shall be that corresponding to the stroke determined from the data provided for the 'Brake Device' at the required actuating force. In the case of spring brakes the actuating force may be converted to an equivalent air pressure and actuator area so the units of the calculation are compatible.

38.4.3.2.                    The ratio of brake force to static 'Axle Load' at each 'Axle' must not exceed that specified in the data for the suspension as 'Approved' under the provision of clause 38.4.6.3. Higher values correspond to wheel skid and unrealised braking potential.

38.4.4.                          Parking Brake Calculation

38.4.4.1.                    The performance of the 'Parking Brake System 38/00' shall be determined on the basis of the characteristics of the 'Foundation Brakes' (where applicable) provided under clause 38.4.6.2 ('Foundation Brakes')