Valve Overlap Angle on The Influence of The Exhaust

by:FLOS     2020-08-20
When you can at broadband interval, four stroke engines a work only several seconds to per stroke, such quick time often can cause lack belonging to the engine intake and exhaust don't net, influence the engine's results. Therefore, it needs through the valve at its onset or late shut, to make up for insufficient intake and exhaust don't net be short of regret. In this case, will be looking a the intake and exhaust in the same time open a moment, with gas phase on call 'valve overlap Angle'.
Valve overlap Angle of engine performance often produced great influence, so this Angle much rate should be used? We know, engine speed is high, each cylinder a work cycle to breathe in and exhaust in the absolute time likewise more short, so accomplish higher efficiency of the air, require to extend engine inhale and exhaust time. Obviously, when larger the speed, the requirements of the valve overlap greater sizing. But in low speed conditions, too much valve overlap Angle tend to make waste plenty of spilled into the inlet end, breathe in quantity may decline, airflow in cylinder will disorder, this time the ECU will because it's difficult to air/fuel ratio for accurate control, leading to the idle instability, low speed torque low. If, on one other hand, with gas institutions in low speed conditions only optimized, so you can can't in high speed higher peak power. So the engine design can pick a compromise plan, can't get into two distinctive conditions are to achieve optimal state.
So in order to solve this problem, requirements with gas phase can based the engine speed and also the different work conditions on the adjustment, everywhere speed could be the ideal into, exhaust efficiency, like is variable valve timing technology development the original intention.
Although variable valve timing technology in each manufacturer for this terms is a little different, but the realization way but quite definitely the matching. To Toyota's VVT-I technology being an example, the important principle is: the system by ECU coordination control, different parts of the engine ECU real-time sensor into the workings belonging to the report. Just like the store has quite best ECU valve timing parameters, so the eu can adjust timing institutions at any moment, which changes the valve rasing and lowering time, or perhaps in advance, or lag behind, or remain the same, this video is below for clear show the functional principle for the VVT web based.
Say simply, VVT product is in the camshaft driving end merely an associated with hydraulic institutions, so with respect to realize the camshaft in a certain vary from the point of view for this adjustment, which equivalent to the valve into the opening and shutting time is adjusted.
Most of the valve on market timing system can perform the intake valve timing in some range of stepless adjustable, and a part of the engine exhaust the door also equipped with VVT system, and further optimize the combustion ability.
The traditional VVT technology through the reasonable distribution of the valve open time can actually effectively help the engine's efficiency and fuel economy, however the technology one more have individual limitations and the bottleneck. But on this basis, through introduction of variable valve lift technology can constitution for VVT of regret, thus make the engine more smooth, natural breathing.
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