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In response to issues experienced on belt driven integrated starter-generator (B-ISG) projects, IP has produced a new crankshaft mounted variable pulley layout. Using a single two-position actuator and incorporating a seismic crankshaft damper the VR pulley gives the following functions and benefits.
- Approximately 2.5 x reduced electrical machine torque requirement for similar starting and re-generative braking capability
- Major reduction in belt tension requirement
- May enable robust cold-cranking and hence elimination of starter motor
- De-coupler function to improve dynamics and prevent belt squeal during engine speed transients
- A/C mode enabling electrical machine to drive A/C compressor whilst engine is stopped
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Technology
- In normal operation the drive to the pulley is via a one-way mechanism, as with many conventional de-coupler alternator drives. By engaging a simple clutch the drive is transmitted via an epicyclic mechanism containing only simple spur gears creating a ratio that can be tuned to suit specific applications.
- If the clutch is left open whilst the engine is stationary, the pulley is de-coupled from the crankshaft enabling the electrical machine to drive the A/C compressor through the belt.
Applications
- B-ISG for large engines
- Hybrid regenerative braking
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Find out more about how this works | |
