VS - Electrical Systems From Stop-Start to Hybridization

For reflex start features The reflex start is the ability to re-engage a start phase even if the engine in the process of stopping, this basically happens when a driver unexpectedly changes his mind and decides to reaccelerate before the vehicle has stopped (restart on the move). In Micro-Hybrid architectures the best in class technical option is the belt-driven machine. For stalling comfort During a conventional engine-stop event, some vibrations occurs at the very end of the stop cycle, these vibrations are transmitted by crankshaft rotational variations and in particular by a final counter rotation related to the conversion between reciprocating motion and rotational motion. Valeo StARS belt drive system is able to impose a braking force to the crankshaft and avoid this final vibration, significantly enhancing the driver Stop- Start comfort experience! Torque (Nm) 40 35 30 25 20 1000 900 800 RPM

The resistive torque varies with OEM’s applications, in order to fit to the numerous demands the stalling torque function is configured in some digital mapping tables for an optimized comfort.

Torque (Nm)

40 35 30 25 20

40

20

30

25

35

10

15

Torque (Nm) 15 10 5 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Rotor speed (rpm) 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 5

Max. Stalling power

Max. Stalling power

Min.

15 10 5 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Rotor speed (rpm)

Min.

Rotor speed (rpm)

Effect of the stalling function on a 1.6L Diesel engine Effect of the stalling function on a 1.6L Diesel engine

Min. Effect of the stalling function on a 1.6L Diesel engine 1000 900 800 Stalling ‘of Stalling ‘on 700 600 500 400 300 200 100 0 0 0.5 1 1.5 2 2.5 3 RPM Time (sec.) 1000 900 800 700 600 500 400 300 200 100 0 0 0.5 1 RPM Max. Stalling power 1000 900 800 700 600 500 400 300 200 100 0 0 0.5 1 RPM 0.5 1 1.5 2 2.5

Stalling Stalling Stalling Stalling

Stalling ‘off’ Stalling ‘on’

Effect of the stalling function on a 1.6L Diesel engine

700 600 500 400 300 200 100 0

1.5 1.5

2 2

2.5 2.5

3 3

Time (sec.) Ti e (sec.)

0

3

Time (sec.) StARS belt drive applies torque to the crankshaft for a smoother stalling phase.

31