FlexValve - Advanced Mechanical Continuously Variable Valve Lift System (CVVL)
Description
An advanced camshaft actuated mechanical valvetrain system that is capable of providing a wide range of fully variable valve lift characteristics.
- Incorporates DuoCam technology
- Valve lift is generated by combining two cam profiles
- Uses a single actuator (hydraulic or electric phaser) to vary the valve lift profile
Technical Benefits
- Reduced NOx emissions - via Warm Up and Keep Warm strategies
- Reduced CO2 emissions – For after treatment thermal management, reduced / no requirement for post injection
- Miller cycle
- Reduced CO2 (fuel consumption)
- Improved Performance - Increased power. Low speed torque & transient torque rise
- Benefits across the full operating map
- Internal EGR – Exhaust secondary lift strategy for effective after treatment thermal management
- Reduced CO2 (fuel consumption) - no requirement for post injection
Application Benefits
- Applicable to a wide range of engines sizes, applications and fuel types
- Integration - Retains Existing OHC / OHV architectures for simple implementation
- Reliable - Mechanical valvetrains that use well known and proven technologies
- Conventional valvetrain layout - Low design and manufacturing investment to integrate
- Low friction - conventional roller followers, no additional hydraulic pumping losses
- Simple Controls - same requirements as a conventional hydraulic cam phaser system controlled by the engines ECU
- Continuously Variable - simple calibration. Direct positional feedback for simple, low cost OBD