Division 6.2.4

The average efficiency of the control area shall be calculated as follows:

• For SR axles:

  • $${\eta }_{\mathrm{avr,mid\; speed}}=\frac{{\eta }_5+{\eta }_6}{2}$$
  • $${\eta }_{\mathrm{avr,high\; speed}}=\frac{{\eta }_8+{\eta }_9}{2}$$
  • $${\eta }_{\mathrm{avr,total}}=\frac{{\eta }_{\mathrm{avr,mid\; speed}}+{\eta }_{\mathrm{avr,high\; speed}}}{2}$$

• For HR axles:

  • $${\eta }_{\mathrm{avr,low\; speed}}=\frac{{\eta }_2+{\eta }_3}{2}$$
  • $${\eta }_{\mathrm{avr,mid\; speed}}=\frac{{\eta }_4+{\eta }_5}{2}$$
  • $${\eta }_{\mathrm{avr,total}}=\frac{{\eta }_{\mathrm{avr,low\; speed}}+{\eta }_{\mathrm{avr,mid\; speed}}}{2}$$

where:

η_{avr,low speed}

average efficiency for low speed

η_{avr,mid speed}

average efficiency for mid speed

η_{avr,high speed}

average efficiency for high speed

η_avr,total

simplified averaged efficiency for axle