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VTEC system
The full name is a variable valve timing and lift electronic control system, which is a proprietary technology of Honda. It can adjust the valve timing and valve lift appropriately with changes in engine speed, load, and water temperature. The engine achieves maximum efficiency at both high and low speeds. In the VTEC system, there are three cam surfaces on the intake camshaft respectively, which respectively jacks up three rocker arms on the rocker arm shaft. When the engine is at low speed or low load, there is no connection between the three rocker arms. The right and left rocker arms actuate the two intake valves, respectively, so that the two have different timings and lifts to form the effect of squeezing air. At this time, the high-speed rocker in the middle does not actuate the valve, but does no effective motion on the rocker shaft. When the speed is increasing, the sensors of the engine send the monitored parameters such as load, speed, speed, and water temperature to the computer. The computer analyzes and processes this information. When it is necessary to change to the high speed mode, the computer sends a signal to open the VTEC solenoid valve, so that the pressurizing oil enters the top piston in the rocker shaft, so that the three rocker arms are connected into one, so that both valves operate in the high speed mode. When the engine speed decreases and the valve timing needs to be changed again, the computer sends out a signal again, opens the pressure of the VTEC solenoid valve, releases the pressure oil, and the valve returns to the low speed operation mode again.
VVT-i system
It is an acronym for the intelligent variable valve timing system and is Toyota's patented technology. The VVT-i system can continuously adjust the valve timing, but it cannot adjust the valve lift. Its working principle is that when the engine is switched from low speed to high speed, the electronic computer automatically presses the oil against the small turbine in the intake camshaft drive gear. Thus, under the effect of pressure, the small turbine is relative to the gear. The shell rotates a certain angle so that the camshaft rotates forward or backward within a range of 60 degrees, thereby changing the timing of the intake valve opening and achieving the purpose of continuously adjusting the valve timing.
Turbo
Turbo English name for the Turbo Charger, if you see Turbo or T in the rear of the car, generally shows that the car uses a turbocharged engine. The turbocharger is actually an air compressor that increases the amount of intake air by compressing the air. It uses the inertial impulse of the exhaust gas emitted by the engine to propel the turbine in the turbine chamber. The turbine also drives the coaxial impeller. The impeller pressures the air sent from the air filter duct to pressurize it into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase at the same time, the impeller will compress more air into the cylinder, the air pressure and density increase can burn more fuel, increase the fuel amount and adjust the engine's Speed, you can increase the engine's output power.
The biggest advantage of the turbocharger is that it can greatly increase the power and torque of the engine without increasing engine displacement. Generally speaking, the power and torque of the engine after installing the turbocharger should be increased by 20%. -30%. The disadvantage of the turbocharger is hysteresis, that is, the inertia of the impeller reacts slowly to changes in the acceleration of the throttle, so that the engine delay is increased or the output power is reduced. This may be a little unattainable for a car that suddenly accelerates or overtakes. The feeling, commonly known as "turbo-lag", needs to be overcome by reducing the gear and raising the speed.
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