Dãn cách tên bằng dấu phẩy(,).
Thảo luận trong 'Động cơ' bắt đầu bởi lieukhai, 4/4/15.
các bác cho em hỏi ngoài loại động cơ vvt-i ra thì còn nhiều lại vvt khác phải không ạ?
Chỉ có loại là VVT-i và VVT không có i thôi bác ạ. Bác đã tìm hiểu về VVT đến đâu rồi?
- Công nghệ VVT-i: Variable Valve Timing with Inteligent - Tiếng Việt là công nghệ "biến đổi thời điểm góc mở/đóng xup pap thông minh"
- Cùng công nghệ này nhưng các hãng khác nhau lại có tên gọi và ký hiệu khác nhau.
Ví dụ: Toyota: VVT-i; Honda: VTEC; Mitsubishi: MiVEC; Hyundai: VVT;
Còn cũng công nghệ này trên xe BMW lại ký hiệu:VANOS (Variable Onckenwellen Steuerung)...
- Nếu áp dung trên cả 2 trục cam hút và xả thi có ký hiệu: DUAL VVT-i.
- Nếu kết hợp cả công nghệ nâng hành trình xup pap thì ký hiệu: VVTL-i (Variable Valve Timing and lift - Inteligent).
Here is list of manufacturers and their respective VVT technologies:
Alfa Romeo - CVVT, Double continuous variable valve timing, used on inlet and exhaust valves on Twin Spark engine
BMW - VALVETRONIC, VANOS and 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.
VALVETRONIC - Provides continuously variable lift for the intake valves; used in conjunction with Double VANOS.
Fiat "StarJet" FIRE-based engine.
BMW/PSAPeugeot Citroën - CVVT , Continuous variable valve timing
Chrysler - Dual VVT, dual Variable Valve Timing. Used on Chrysler GEMA "World" engine. Varies valve timing through the use of concentric camshafts developed by Mechadyne enabling dual-independent inlet/exhaust valve adjustment on the 2008 Dodge Viper.
Daihatsu - DVVT, Dynamic variable valve timing
Ford - VVT, Variable valve timing. Varies valve timing by rotating the camshaft.
General Motors - VVT, Variable valve timing, Varies valve timing continuously throughout the RPM range for both intake and exhaust. DCVCP (Double Continuous Variable Cam Phasing) - Varies intake and exhaust camshaft timing continuously with hydraulic vane type phaser.
Kia - CVVT, Continuous variable valve timing
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. i-VTEC does not necessarily have two sets of cam lobes like 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.
Hyundai - CVVT, Continuous variable valve timing - provides continuous variable valve timing on Intake, Fuel System and Exhaust all independently controlled
Mazda - S-VT - The ECU calculates intake timing and actuates an oil control valve to modulate oil pressure on intake camshaft.
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.
MG Rover - VVC, Variable Valve Control
Nissan - CVTCS, Continuous Variable Valve Timing Control System. The ECU adjusts the engine's timing continuously. 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.
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.
Toyota - VVT - Toyota introduced VVT in the 1992 Corolla GT,
VVT-i Variable Valve Timing with intelligence Continuously varies the timing of the intake camshaft, or both the intake and exhaust camshafts (depending on application), and VVTL-i, Variable Valve Timing with Lift and Intelligence continuously varies the timing of the intake valves. Varies duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
Volvo - CVVT, Continuous variable valve timing
Wolkswagen Group - 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.