European Customer Technology Centers - Delphi

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ECE WHSC It consists of a number of speed and power modes which cover the typical operating range of HD. The weighting factors (WF) are given for reference only. Idle mode is separated in 2 modes, mode 1 at the beginning and mode 13 at the end of the test cycle. Load, % 100 70 50 25 17/2% 24% 1/13 0 Motoring 25 Heavy Duty 2% 5 8% 10% 6% 10% 6 12 8 3 2 3% 3% 7 4 8% 5% 11 9 35 45 2% 2% 55 10 75 100 Engine Speed, % Mode Speed [%] Load WF 1) Mode length [s] Incl. 20 s ramp 0 Motoring - 24% - 1 0 0 17%/2 210 2 55 100 2% 50 3 55 25 10% 250 4 55 70 3% 75 5 35 100 2% 50 6 25 25 8% 200 7 45 70 3% 75 8 45 25 6% 150 9 55 50 5% 125 10 75 100 2% 50 11 35 50 8% 200 12 35 25 10% 250 13 0 0 17%/2 210 Sum 100% 1895 1) WF = Weighting Factor 8
ECE - WWHD General Test Sequence Heavy Duty Engine preparation, pre-test measurements, performance checks and calibration Generate engine map (max torque curve) – Generate reference test cycle Run 1 or more practice cycles as necessary to check engine/test cell/emissions systems WHTC Natural or forced engine cool-down Ready all systems for sampling and data collection Cold start exhaust emissions test 20 minutes hot soak Hot start exhaust emissions test Data collection and evaluation – Emissions calculation WHSC Preconditioning of engine and particulate system including dilution tunnel Set PM systems in by-pass mode and change dummy PM filter to weighted sampling filter. Ready all systems for sampling and data collection Exhaust emissions test within 5 min after engine shut down 9
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