Đang tải...

Công nghệ vật liệu Hệ thống phối khí thông minh của 1 số hãng xe

Thảo luận trong 'Công nghệ mới' bắt đầu bởi phamhuy, 6/6/09.

Thành viên đang xem bài viết (Users: 0, Guests: 0)

  1. phamhuy
    Offline

    Tài xế O-H
    Expand Collapse

    Tham gia ngày:
    3/4/09
    Số km:
    2,611
    Được đổ xăng:
    546
    Mã lực:
    516
    Giới tính:
    Nam
    Xăng dự trữ:
    3,413 lít xăng
    ¯ Alfa Romeo:
    Twin Cam - some versions are equipped with Variable Valve Timing technology.
    Twin Spark - is equipped with Variable Valve Timing technology.
    JTS - is equipped with Variable Valve Timing technology, both intake and exhaust.
    ¯BMW:
    Valvetronic - Provides continuously variable lift for the intake valves; used in conjunction with Double VANOS.
    VANOS - Varies intake timing by rotating the camshaft in relation to the gear.
    Double VANOS - Continuously varies the timing of the intake and exhaust valves.
    ¯ Fiat:
    "StarJet" FIRE-based engine.
    Multiair continuously varies the timing of the inlet valve by changing oil pressure.
    Ford Variable Cam Timing - Varies valve timing by rotating the camshaft.
    Chrysler - Varies valve timing through the use of concentric camshafts developed by Mechadyne enabling dual-independent inlet/exhaust valve adjustment on the 2008 Dodge Viper.
    ¯ General Motors Corporation (GM) :
    VVT - Varies valve timing continuously throughout the RPM range for both intake and exhaust for improved performance in both overhead valve and overhead cam engine applications.
    DCVCP (Double Continuous Variable Cam Phasing) - Varies intake and exhaust camshaft timing continuously with hydraulic vane type phaser.
    Alloytec - Continuously variable camshaft phasing for inlet cams. Continuously variable camshaft phasing for inlet cams and exhaust cams (High Output Alloytec).
    ¯ Honda:
    VTEC - Varies duration, timing and lift by switching between two different sets of cam lobes.
    i-VTEC - In high-output DOHC 4 cylinder engines the i-VTEC system adds continuous intake cam phasing (timing) to traditional VTEC. In economy oriented SOHC and DOHC 4 cylinder engines the i-VTEC system increases engine efficiency by delaying the closure of the intake valves under certain conditions and by using an electronically controlled throttle valve to reduce pumping loss. In SOHC V6 engines the i-VTEC system is used to provide Variable Cylinder Management which deactivates one bank of 3 cylinders during low demand operation.
    VTEC-E - Unlike most VTEC systems VTEC-E is not a cam switching system, instead it uses the VTEC mechanism to allow for a lean intake charge to be used by closing one intake valve under certain conditions.
    ¯ Hyundai:
    MPI CVVT - Varies power, torque, exhaust system, and engine response.
    ¯ Kawasaki:
    Varies position of cam by changing oil pressure thereby advancing and retarding the valve timing, 2008 Concours 14.
    ¯ Lexus:
    VVT-iE - Continuously varies the intake camshaft timing using an electric actuator.
    ¯ Mazda:
    S-VT - Continually varies intake timing and crank angle using an oil control valve actuated by the ECU to control oil pressure.
    ¯ Mitsubishi:
    MIVEC - Varies valve timing, duration and lift by switching between two different sets of cam lobes. The 4B1 engine series uses a different variant of MIVEC which varies timing (phase) of both intake and exhaust camshafts continuously.
    ¯ Nissan:
    N-VCT - Varies the rotation of the cam(s) only, does not alter lift or duration of the valves.
    VVL - Varies timing, duration, and lift of the intake and exhaust valves by using two different sets of cam lobes.
    CVTC introduced with the HR15DE, HR16DE, MR18DE and MR20DE new engines in September 2004 on the Nissan Tiida and North American version named Nissan Versa (in 2007); and finally the Nissan Sentra (in 2007).
    VVEL introduced with the VQ37VHR Nissan VQ engine engine in 2007 on the Infiniti G37.
    ¯ Porsche:
    VarioCam - Varies intake timing by adjusting tension of a cam chain.
    VarioCam Plus - Varies intake valve timing by rotating the cam in relation to the cam sprocket as well as duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
    ¯ Proton Campro CPS:
    Varies intake valve timing and lift by switching between 2 sets of cam lobes without using rocker arms as in most variable valve timing systems. Debuted in the 2008 Proton Gen-2 CPS and the 2008 Proton Waja CPS.
    ¯ PSA Peugeot Citroen:
    CVVT - Continuous variable valve timing.
    ¯ Renault Clio 182:
    Clio Cup and Clio V6 Mk2 VVT - variable valve timing.
    ¯ Rover VVC:
    Varies timing with an eccentric disc.
    ¯ Suzuki:
    VVT - Suzuki M engine
    ¯ Subaru:
    AVCS - Varies timing (phase) with hydraulic pressure, used on turbocharged and six-cylinder Subaru engines.
    AVLS - Varies duration, timing and lift by switching between two different sets of cam lobes (similar to Honda VTEC). Used by non-turbocharged Subaru engines.
    ¯ Toyota:
    + In 1998, Toyota began offering a new technology, VVTL-i, which can alter valve lift (and duration) as well as valve timing. In the case of the 16 valve 2ZZ-GE, the engine has 2 camshafts, one operating intake valves and one operating exhaust valves. Each camshaft has two lobes per cylinder, one low rpm lobe and one high rpm, high lift, long duration lobe. Each cylinder has two intake valves and two exhaust valves. Each set of two valves are controlled by one rocker arm, which is operated by the camshaft. Each rocker arm has a slipper follower mounted to the rocker arm with a spring, allowing the slipper follower to move up and down with the high lobe without affecting the rocker arm. When the engine is operating below 6000-7000 rpm (dependent on year, car, and ECU installed), the low lobe is operating the rocker arm and thus the valves. When the engine is operating above the lift engagement point, the ECU activates an oil pressure switch which pushes a sliding pin under the slipper follower on each rocker arm. This in effect, switches to the high lobe causing high lift and longer duration.
    Toyota has now ceased production of its VVTL-i engines for most markets, because the engine does not meet Euro IV specifications for emissions. As a result, this engine has been discontinued on some Toyota models, including that of the Corolla T-Sport (Europe), Corolla Sportivo (Australia), Celica, Corolla XRS, Toyota Matrix XRS, and the Pontiac Vibe GT, all of which had the 2ZZ-GE engine fitted.
    The Lotus Elise continues to offer the 2ZZ-GE and the 1ZZ-FE engine, while the Exige offers the engine with a supercharger.
    + Dual VVT-i:

    In 1998, Dual VVT-i which adjusts timing on both intake and exhaust camshafts was first introduced on the RS200 Altezza's 3S-GE engine.
    Dual VVT-i is also found in Toyota's new generation V6 engine, the 3.5-liter 2GR-FE first appearing on the 2005 Avalon. This engine can now be found on numerous Toyota and Lexus models. By adjusting the valve timing engine start and stop occurs virtually unnoticeable at minimum compression. In addition fast heating of the catalytic converter to its light-off temperature is possible thereby reducing hydrocarbon emissions considerably.
    Toyota's UR engine V8 also use this technology. Dual VVT-i was later introduced to Toyota's latest small 4-cylinder ZR engines found in compact vehicles such as the new Toyota Corolla and Scion XD and in larger 4-cylinder AR engines found in the Camry and RAV4.
    VVT-iE uses an electric motor instead of hydraulic system to control intake valve timing offering greater precision at lower rpms and temperatures.
    + Valvematic:

    Toyota first presented details about its latest Valvematic technology in June 2007.Valvematic made its first appearance in 2007 in the Noah and later in early-2009 in the ZR engine family used on the Toyota Avensis. This system is simpler in design compared to Valvetronic and VVEL, allowing the cylinder head to remain at the same height.
    ¯ Volkswagen Group:
    VVT introduced with later revisions of the 1.8t engine, and the 30v 2.8l V6. Similar to VarioCam, the intake timing intentionally runs advanced and a retard point is calculated by the ECU. A hydraulic tensioner retards the intake timing. Most modern VW Group petrol engines now include VVT on either the inlet cam, or both inlet and exhaust cams, as in their V6, V8 and V10 engines.
    ¯ Volvo:
    CVVT.
    ¯ Yamaha:
    VCT (Variable Cam Timing) Varies position of cam thereby advancing and retarding the valve timing.
    Proton - VVT introduced in the Waja 1.8's F4P renault engine (toyota supplies the VVT to renault)
     
  2. shiva89
    Offline

    Oto-Hui
    Expand Collapse

    Tham gia ngày:
    6/6/09
    Số km:
    238
    Được đổ xăng:
    1
    Mã lực:
    31
    Xăng dự trữ:
    110 lít xăng
    mai dic lun de chu mao dẻ vay coi met lam
    tao khoa map ne(_ _!)
     
  3. phamhuy
    Offline

    Tài xế O-H
    Expand Collapse

    Tham gia ngày:
    3/4/09
    Số km:
    2,611
    Được đổ xăng:
    546
    Mã lực:
    516
    Giới tính:
    Nam
    Xăng dự trữ:
    3,413 lít xăng
    tài liệu này viết cũng dễ hiễu lắm, :d sẵng luyện anh văn chuyên ngành luôn :d
     
  4. duykhanh87
    Offline

    Tài xế O-H
    Expand Collapse

    Tham gia ngày:
    29/9/09
    Số km:
    0
    Được đổ xăng:
    0
    Mã lực:
    0
    Xăng dự trữ:
    114 lít xăng
    toan la tieng anh :7:
     

Chia sẻ trang này