Sentences with phrase «hydraulic valve actuator»
The 6 cylinder engines have had challenges with the HVA (hydraulic valve actuators or lifters)...
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Fiat have recently (commercially available in 2009) developed the Multi-air system which using electronically controlled hydraulic actuators so that they can adjust valve duration on a stoke by stroke basis.
The MultiAir system consists of electro - hydraulic variable valve actuators filled with conventional oil, which is interposed between the camshaft and each valve.
These actuators have hydraulic pistons controlled by hydraulic solenoid valves which provide proportional control of the pistons using pulse width modulation (PWM).
The engine valve is connected to the hydraulic actuator piston.
The system comprises two rotary spool valves, two phase shifters, a single - acting spring - return hydraulic actuator for each engine valve, and a hydraulic power unit.
Master Cylinder, Power Booster, Calipers and Wheel Cylinders, Combination Valve, Metal Hydraulic Lines and Fittings, Pump Motor Assembly, Hydraulic Control Unit, Actuators, ABS Module, ABS Sensors, ABS Switches, ABS Relays
Whereas traditional VTEC operation changes valve opening duration based on higher oil pressure during high rpm operation at one side of the valvetrain's rocker arms, the Civic's i - VTEC system can switch valve timing duration at low rpm and low oil pressure using two hydraulic actuators on both sides of the intake rocker arm.
That latter engine comes standard in Trailhawk trim, and uses Fiat's MultiAir 2 technology, controlling intake valves with electro - hydraulic actuators.
In contrast to the EA211, the intake camshaft is adjusted using a high - speed hydraulic camshaft actuator with a central control valve.
Designed for their luxury vehicles, this form of variable valve timing replaces the hydraulic actuator that advances and retards the intake camshaft timing with an electric motor.