Division 2 Testing procedure

United Kingdom

The efficiency of the alternator must be determined by doing measurements at different speeds: 1 800, 3 000, 6 000, 10 000 revolutions per minute. At each speed the alternator is charged at 50 % of the maximum load. For calculating the efficiency, a time distribution is to be 25 %, 40 %, 25 %, 10 % for respectively 1 800, 3 000, 6 000, 10 000 revolutions per minute (see the VDA approach as described in point 5.1.2 in Annex I to the Technical Guidelines).

This leads to the following formula (1):

F1 ${Δη}_{A} = \sqrt ({({0,25 * S}_{1 800})}^{2} + {({0,40 * S}_{3 000})}^{2} + {({0,25 * S}_{6 000})}^{2} + {({0,1 * S}_{10 000})}^{2})$

With:

η_Α is the efficiency of the alternator;
(η @1 800 rpm @0,5·I_N) is the efficiency of the alternator at a speed of 1 800 rpm and at a load of 50 %;
(η @3 000 rpm @0,5·I_N) is the efficiency of the alternator at a speed of 3 000 rpm and at a load of 50 %;
(η @6 000 rpm @0,5·I_N) is the efficiency of the alternator at a speed of 6 000 rpm and at a load of 50 %;
(η @10 000 rpm @0,5·I_N) is the efficiency of the alternator at a speed of 10 000 rpm and at a load of 50 %;
I_N = Current (A)

The set-up of the test bench and the testing procedure is to fulfil the precision requirements specified in ISO 8854:2012^f1.

Annotations

Textual amendments

F1: Substituted by Commission Implementing Decision of 16 July 2014 on the approval of the DENSO efficient alternator as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council and amending Commission Implementing Decision 2013/341/EU (Text with EEA relevance) (2014/465/EU).

Footnotes

f1: ISO 8854. Road vehicles — Alternators with regulators — Test methods and general requirements. Reference number ISO 8854:2012(E).