Title : Alternative warm-up procedure WLTP-08-29-rev1e by Japan OIL# 19 Title : Alternative warm-up procedure　 WLTP-08-29-rev1e by Japan Brief description EU manufacturer claimed that current WLTC based warm-up procedure takes too much time so alternative warming up method should be set. On the other hand, inappropriate alternative warm-up procedure may cause flexibility (i.e. transferring road load at low temperature vehicle condition etc.) . Hence the alternative procedure should be evaluated with a equivalency to the WLTC based warm-up cycle. Initial proposal The cycle and method of an alternative warm-up procedure should be based on each manufacture’s recommendation. The manufacturer shall show its equivalency to WLTC warm-up result to get approval by Responsible Authority in advance. When the manufacturer uses the alternative warm-up procedure, detail test condition should be reported. Vehicle representing the family defined in (3) shall be selected in the verification of equivalency and meet the criteria as below. The cycle energy demand of each applicable phases calculated according to paragraph 5 of Annex 7 of the dyno set road load value obtained by alternative warm-up procedure must be equal or higher than that of WLTC warm-up procedure. Alternative warm-up procedure family shall adopt the Road Load family.

Case 1:　 Whole WLTC cycle -> Worse case Specific phase -> Better case -> Alternative is NOT allowed Case 2:　 Whole WLTC cycle -> Worse case Specific phase -> Worse case -> Alternative is allowed Low /Mid phase are better case. All phases are worse case.