Delphi Bi-State Real-Time Damping Monotube

The Delphi Bi-state Real-time Damping (BSRTD) Monotube System is a semiactive, two-position damping control system that responds in real time to road and driving conditions, based on input from sensors that monitor body and wheel motions. Vehicle speed, steering angle, and braking are also used as inputs.

This production-proven system consists of four two-position monotube shock absorbers with internal solenoid valve and optional lift capability, four motion sensors, and a controller. Optional features can include a steering sensor and a driver preference switch.

Features	Benefits
Production-proven system	High reliability and maintenance free
Automatic, continuous control of body modes	Increased maximum damping forces for high levels of body motion and wheel control
Full-car modal control (heave/pitch/transient roll)	Reduced minimum damping forces for improved isolation and smoothness
Wide range of rebound and jounce damping capability	Tailors ride and handling for multipurpose vehicles
Standard monotube damper configuration: 46 mm piston/50 mm reservoir Internal solenoid valve Optional hydraulic rebound cutoff Airlift configuration available Dead-length minimization Air/oil separation Ring mount or bayonet electrical connection capability	Provides packaging ease: packages in place of most conventional passive shock absorbers Compatible with leveling control systems Offers high reliability and durability with simplified design
Independent damping control at each corner Optional anticipatory control of transient driver-induced handling maneuvers	Increases damping at corner when needed to control body motions Enhances vehicle handling and stability Extends limits of vehicle performance
Extensive error detection and diagnostic capability	Reduces warranty impact

Typical Applications

The Delphi Bi-state Real-time Damping Monotube System is designed for up-level sport utility vehicles, as well as luxury automobile platforms with shock absorber suspension systems. An optional lift capability feature is available.

Performance Advantages

Delphi's Bi-state Real-time Damping Monotube System offers a high level of durability, premium ride, and distinctive handling—all performed automatically. BSRTD technology delivers a ride with very little heave, roll, or pitch motion. It also offers nearly instantaneous suspension response to vehicle wheel and body movement.

Operating Conditions

Dampers: -40° to 125°C
Sensors and optional compressor module: -40° to 105°C
Electronic Control Unit: -40° to 85°C

Specifications

Parameters	Requirements
Wheel-to-body position sensor	Driven by system controller Ratiometric analog output signal Supports ride control and leveling systems Underbody and wheel well packaging capability
Electronic Control Unit	In-vehicle or underbody packaging potential Stand-alone ECU with capability to integrate other chassis control functions
Bi-state monotube damper	Standard monotube package: 11.5 mm rod 46 mm bore 50 mm reservoir Driven by system controller Packages in existing suspension system
Optional leveling compressor module	Underbody and engine compartment packaging capability High-pressure capability available Integrates with existing sensors and controller Requires vehicle power and relay/fusing
Control system loop time	Approximately 2 msec

The Delphi Advantage

Delphi uses its knowledge of complete vehicle systems to offer manufacturers a full array of advanced vehicle dynamics, from individual components to completely integrated systems. Delphi offers innovations in controlled suspension, braking, front and rear steering, as well as coordinated engine torque management control. Delphi's innovative advanced vehicle dynamics also include: collision avoidance, rollover prevention, skid reduction, and reduced turning radius. Delphi's understanding of these functions can help vehicle manufacturers avoid costly trial-and-error processes. Delphi engineers work closely with vehicle manufacturers to help them achieve distinctive ride and handling characteristics for their vehicle programs that enhance performance and customer enthusiasm. Delphi offers its technical centers and manufacturing sites from North America to China to help provide personalized customer service and timely product delivery.

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Ride Control

Delphi Bi-state Real-time (BSRTD) Damping Monotube System