1. No category

Twin Function Exchanger
Valeo Thermal System /R&D Advanced Development
Jose BORGES ALEJO
April 2015
April 2015 I
Context
Diesel tests approval at -7°C/ Influence of very lo w ambient temperatures
test conditions: NEDC with Serial calibration Euro 5 ; emissions measurement downstream DOC and DPF
Ambient
temperature
20°C
-7°C
Intake air
temperature
20°C
HC (g/cycle)
0.36
CO (g/cycle)
5.10
-7°C
2.86
20.20
20°C
0.6
8.56
38°C
0.36
4.69
> Heating Intake Air as a first order parameter to improve engine behaviour at cold conditions
April 2015 I
Page 2
Twin Function Exchanger
System description
Twin Function (TF) heat exchanger combines
1. Intake air temperature management by use
of recovered exhaust heat
2. Low Pressure EGR function
Coolant
valve
Air Intake Module
w/ temp.-controlled
Charge Air HEX
List of components (resulting in a ~ 2 kg weight
increase)
1.
TF-exchanger positioned in the main
exhaust line.
(in exchange with LP EGR cooler)
2.
3.
4.
Dedicated TF-exchanger bypass
Exhaust gas bypass valve
2 coolant valves
(to connect the TF-exchanger either to LT- or HT-loop)
EWP
EWP1
Exhaust gas
bypass valve
Coolant
valve
Benefit of the system
Accelerated engine warm-up based on
recovered waste heat resulting in reduced
emissions.
TFExchanger
bypass
Twin Function
Exchanger
April 2015 I
Page 3
April 2015 I