NVH

Hybrid and Electric Vehicle powertrain architecture creates unique driveline and NVH mitigation challenges due to multiple sources of transient excitation. Ricardo is well experienced in identifying and resolving these issues

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

Sound quality issues including: unexpected acoustic signature due to hybrid-specific operating modes such as electric-only operation, 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 electric motor drive systems

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