The active valve control system (AVCS) is an automobile variable valve timing technology used by Subaru. It varies the timing of the valves by using hydraulic oil pressure to rotate the camshaft, known as "phasing",[1] in order to provide optimal valve timing for engine load conditions. The system is closed loop using the camshaft sensors, crankshaft sensors, air flow meter, throttle position as well as oxygen sensors and/or Air-Fuel ratio sensors in order to calculate engine load. The ECU is programmed to operate control valves that adjust the delivery of the hydraulic pressure in order to move the camshaft into the position that will provide the engine with the best performance while meeting emissions standards.
AVCS is used on the Version 7 and up EJ207 engines, the EJ204, EJ254, EJ255, EJ257, the second generation EZ30D (2005+ in the USA market) found in the Legacy Outback, Legacy 2.0R, 3.0R and the B9 Tribeca.
A dual AVCS system phases both the intake and exhaust camshafts on the EZ36 found in the 2008+ Tribeca, 2009+ Outback 3.6R, 2009+ Legacy 3.6R, and on the 2008+ STi EJ257 (W25 heads). Dual AVCS is present on the new FA20 engines in the 2015+ WRX, Forester and BRZ and the FB20 engines in the 2012+ Impreza / Crosstrek, though they actuate with a different method than those of the older engines. Dual AVCS is also found on Japanese-spec engines, notably the late model EJ207s in the WRX STI.[1]
The activevalvecontrolsystem (AVCS) is an automobile variable valve timing technology used by Subaru. It varies the timing of the valves by using hydraulic...
The I-ActiveValve Lift System (i stands for intelligence) or i-AVLS is a valvetrain technology implemented by Subaru in the 2.5L naturally aspirated engines...
that have different controls for their actuation in different directions. A desmodromic valve is a reciprocating engine poppet valve that is positively...
An active suspension is a type of automotive suspension that uses an onboard controlsystem to control the vertical movement of the vehicle's wheels and...
The International Space Station (ISS) External Active Thermal ControlSystem (EATCS) maintains an equilibrium when the ISS environment or heat loads exceed...
2004 XT, the turbocharged version had Activevalvecontrolsystem cylinder heads. The i-AVLS (activevalve lift system) became standard on the naturally aspirated...
Active Body Control, or ABC, is the Mercedes-Benz brand name used to describe electronically controlled hydropneumatic suspension. This suspension combines...
damping was activelycontrolled by a combined power steering/suspension fluid pump and valve body that counteracted roll and pitch forces. This system of controlling...
with intake and exhaust variable valve timing (which Subaru designates as AVCS, standing for ActiveValveControlSystem), and a timing chain that replaced...
throttle valve.[citation needed] When used in conjunction with variable valve timing (VVT), variable valve lift can potentially offer infinite control over...
automatic closed-circuit systems, an electronically controlled solenoid valve injects oxygen into the loop when the controlsystem detects that the partial...
special exhaust system for ACC-equipped vehicles. The system uses an activevalve to divert exhaust between two different exhaust systems. It also has a...
heavy trucks: Traction control is available as well. Here the pneumatic brake system needs some additional valves and control logic to realize a TCS (or...
conventional traction controlsystems at the time featured only a slip control function, Mitsubishi's TCL system had an active safety function, which...
conventional fixed-wing aircraft flight controlsystem (AFCS) consists of flight control surfaces, the respective cockpit controls, connecting linkages, and the...
four valves per cylinder that were actuated by roller rocker arms. The EJ20X and EJ20Y engines were equipped with Subaru's ‘Dual ActiveValveControl System’...
Valve Corporation, also known as Valve Software, is an American video game developer, publisher, and digital distribution company headquartered in Bellevue...
was vastly increased. A solenoid controlvalve assembly integrated into the engine valley cover contains solenoid valves that provide a pressurized oil...
A fire sprinkler system is an active fire protection method, consisting of a water supply system providing adequate pressure and flowrate to a water distribution...
A control loop is the fundamental building block of controlsystems in general and industrial controlsystems in particular. It consists of the process...
the flow controlvalve (FCV). One FCV is installed for each PACK. A normally closed isolation valve prevents air from the left bleed system from reaching...
Valve (CBV) to each of the exhaust manifold tracts, in order to provide the necessary air for the combustion of the fuel. The system was controlled by...
is controlled directly or automatically by controlvalves and distributed through hoses, tubes, or pipes. Hydraulic systems, like pneumatic systems, are...
A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system. In the interest of improving...
17 March 2023. Bazigou E, Makinen T (March 2013). "Flow control in our vessels: vascular valves make sure there is no way back". Cell Mol Life Sci. 70...
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