Speed Dependent Damping Control

Speed Dependent Damping Control (also called SD²C) was an automatic damper system installed on late-1980s and early-1990s Cadillac automobiles. This system firmed up the suspension at 25 mph (40 km/h) and again at 60 mph (97 km/h). The firmest setting was also used when starting from a standstill until 5 mph (8 km/h).

Applications:

1989–1992 Cadillac Allanté

Computer Command Ride

The semi-active suspension system was updated as Computer Command Ride in 1991. This new system included acceleration, braking rates, and lateral acceleration to the existing vehicle speed metric.

1991– Cadillac Fleetwood
1991– Cadillac Eldorado
1991– Cadillac Seville
1991– Cadillac De Ville (optional, standard for 1993)
1992– Oldsmobile Achieva SCX W41

References

Daniel Charles Ross. "Cadillac Allanté". Motor Trend (February 1989): 88–93.
Robert J. Reuter (1989-02-01). "Speed Dependent Damping for the 1989 Cadillac Allante". doi:10.4271/890178. SAE Technical Paper 890178.

Powertrain

Part of the Automobile series

Automotive engine	Petrol engine Diesel engine

Transmission	Automatic transmission Clutch Continuously variable transmission Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Electrohydraulic manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gear stick Giubo Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park by wire Preselector gearbox Semi-automatic transmission Shift by wire Torque converter Transaxle Transmission control unit Universal joint

Hybrid	Electric motor Hybrid vehicle drivetrain Electric generator Alternator

Portal Category

Automotive handling

Main topics

Spring types

Suspension types

Dependent	Beam axle De Dion tube Multi-link

Semi-independent	Twist beam

Independent	Double wishbone (Jaguar IRS) Dubonnet MacPherson strut (Chapman strut) Multi-link Sliding pillar Swing axle Trailing arm (Semi-trailing arm)

Chassis control system

Part of the Automobile series

Suspension	Anti-roll bar (sway bar) Axle Axle track Beam axle Camber angle Car handling Coil spring De Dion tube Double wishbone Hydrolastic (Hydragas) Hydropneumatic Independent suspension Leaf spring Live axle MacPherson strut Multi-link suspension Panhard rod Shock absorber Swing axle Toe angle Torsion bar Trailing arm Unsprung mass Watt's linkage Wheel alignment Wheelbase

Steering	Ackermann steering geometry Caster angle Kingpin Oversteer Power steering Rack and pinion Torque steering Understeer

Brakes	Automatic braking Anti-lock braking system Active rollover protection Brake bleeding Brake fade Brake fluid Brake lining Disc brake Drum brake Electric Park Brake Electronic brakeforce distribution Electronic stability control Engine braking Hydraulic brake Hydraulic fluid Inboard brake Parking brake Regenerative brake Vacuum servo

Roadwheels Tires (Tyres)	Alloy wheel Custom wheel Drive wheel Hubcap Outline of tires Rostyle wheel Spinner Whitewall tire Wire wheels

Portal Category

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