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1 intelligent variable valve timing VVT-i
VVTmdash;. I intelligent system Toyota VVT (Variable Valve Timing and Lift with intelligence) system abbreviation, is a control valve when the intake camshaft timing device, the latest Toyota car engine has been widely installed VVTmdash; i system. Toyota VVTmdash; i system continuously adjustable valve timing, when it is optimized by adjusting the valve timing camshaft rotational angle, but can not adjust the valve lift. Its working principle is: when the engine is converted from the low to the high speed, the computer is automatically machine hydraulic pressure to the turbine intake camshaft driving pinion in the gear, so that, under the effect of pressure on small turbine with respect to the gear shell certain angle of rotation, so that the cam shaft rotated forward or backward in the range of 60 degrees, thereby changing the opening timing of the intake valve, the purpose of continuous adjustment of the valve timing. Thereby improving the speed range in all power, engine fuel economy, reduce exhaust emissions.
VVT-i. The system is the abbreviation Toyota intelligent variable valve timing system. In recent decades, based on improving power, economy and reduce engine emissions requirements for cars, many countries and engine manufacturers, research institutions put a lot of manpower and material resources to carry out research and development of new technologies. At present, these new technologies and new methods, and some have been used in internal combustion engines, is in some stage of development and improvement, could become the future direction of the internal combustion engine technology.
ECM Toyota VVT-i in the various driving conditions of the engine to automatically search for a corresponding one of the engine rotational speed, intake air amount, the timing and throttle position valve optimum cooling water temperature, and controlling the camshaft timing when the hydraulic control valve, and by the respective sensors to sense the signal timing of the actual valve timing, and then performs feedback control, the error compensation system, to achieve optimum valve timing position, which can effectivelyImprove the power and performance of the car, to minimize fuel consumption and exhaust emissions.