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Hybrid powertrain architecture creates unique driveline and NVH mitigation challenges due to multiple sources of transient excitation

Driveline Dynamics

• Clunk – caused by fast torque reversal through gear lash unwinding and winding the torsion shaft
• Torque blending (steady-state or transient) mismatch between engine and electric motor
• Transient torque blending mismatch between electric motor and friction brakes during ABS event
• Sudden drop-off of electric torque due to faulty motor, power electronics or battery

NVH Issues

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• Sound quality issues - Unexpected acoustic signature due to hybrid-specific operating modes such as electric-only operation and audible noise from motor / gears Idle rattle
• Driveline vibrations due to low-speed electric motor torque ripple

Ricardo capabilities

• Experienced Transmission & Driveline NVH problem solving (Gear whine, Gear Rattle, Gearshift Quality)
• Closely linked to Ricardo Transmission design to give proven, “real world” solutions
• Powertrain and Vehicle NVH expertise
• Supported by simulation experts in vehicle transmission, driveline, engine and whole vehicle