What is the difference between i vtec and vtec

The difference between the i-VTEC and the VTEC is that the i-VTEC is an improvement of the VTEC technology with the addition of variable timing to the valve lift technology, that is, the former is relatively the subsequent improvement technology of the latter.

VTE stands for: venous thromboembolism. VTE refers to the abnormal clotting of blood in the deep veins, which makes the lumen partially or completely blocked, which is more likely to occur in the lower limbs, and 50% of the blood is easy to detach and cause pulmonary thrombosis.

These include deep vein thrombosis (DVT) and pulmonary thromboembolism (PTE), which are the third most common cardiovascular diseases after myocardial infarction and stroke, and one of the preventable causes of death in hospitalized patients.

Swelling and pain in the affected limb is the most common clinical manifestation of deep vein thrombosis (DVT).

Patients present with thrombosis associated with peripheral intravenous central venous catheter (PICC) insertion, unequal burn-out of arms and arm circumferences in both upper extremities, soreness, swelling and pain in the affected limb, or limb movement disorders; Patients with dyspnea, chest pain, cough and/or hemoptysis, cyanosis of the lips, irritability, etc., auscultation of the lungs and hearing wheezing, fine crackles or vascular bruits, alert pulmonary thromboembolism (PTE).

High-risk population: over 40 years old; Corpulent; History of venous thrombosis; Surgery; spinal cord injury; Acute ** dyeing; sedentary and prolonged standing; edema of the lower extremities; Varicosity; central venous catheterization; long-term bed rest; pregnancy, etc.

VTE preventive care.

Low risk: Basic prevention.

Intermediate: pharmacological prophylaxis and/or primary prophylaxis.

High risk: pharmacological prophylaxis combined with mechanical prophylaxis.

The VTEC is an ECU that is mechanically controlled indirectly through multiple sets of camshafts and rocker arms, and cannot achieve continuous variable timing. IVTEC is an ECU that controls the valve timing through an electromagnetic structure, and the valve timing can be continuously changed.

Engine variable valve timing technology (VVT, variable valve timing) is one of the new technologies that has been gradually applied to modern cars in recent years, the engine adopts variable valve timing technology to improve the intake charge, so that the charge coefficient increases, and the torque and power of the engine can be further improved.

Variable valve timing theory.

Proper selection of valve timing to ensure the best possible inflation efficiency v is an extremely important technical issue to improve engine performance. Analyzing the working principle of the internal combustion engine, it is not difficult to conclude that in the four periods of opening and closing of the intake and exhaust valves, the change of the delay closing angle of the intake valve has the greatest impact on the charging efficiency v.

The relationship between the effect of the change of the intake valve delay angle on the inflation efficiency v and the engine power can be further illustrated in Figure 1.

Each inflation efficiency v curve reflects the relationship between inflation efficiency v and rotational speed under a certain distribution time. For example, when the delay closing angle is 40°, the inflation efficiency v is the highest value at a speed of about 1800r min, indicating that the inertial inflation of the air flow can be best used to work at this speed.

The main difference between VTEC and IVTEC is that IVTEC is controlled by the ECU through the electromagnetic structure, which can continuously change the valve timing, while the VTEC is indirectly controlled by the ECU through multiple sets of camshafts and rocker arms, and cannot continuously change the valve timing.

The essence of these two technologies is to make the engine work in different cycle modes by changing the valve lift and phase. In the process of working, the engine can achieve high working efficiency at both low speed and high speed.

VTEC stands for Variable Valve Timing System and Electronic Valve Lift Control System. This technology is also the world's first valve control system that can simultaneously control valve opening and closing time and valve lift.

The most well-known is the VTEC engine technology used by Honda. After the engine adopts this technology, it not only changes the power parameters of the engine, but also minimizes exhaust emissions and optimizes the fuel economy of the engine when the engine is working at low speed.

IVTec is essentially an upgraded version of VTEC. On this basis, a variable timing control erection device is added. During engine operation, the overlapping time of the timing and opening of the exhaust valve is variable.

The difference between VTEC and IVTEC is that the principle shirt is not the same. 1. IVTEC is operated by ECU by using electromagnetic structure to control the valve engine timing, which can continuously change the valve engine timing; 2. VTEC is an indirect mechanical operation by ECU using several sets of engine camshafts and rocker arms; 3. Unable to achieve continuous variable engine timing; 4. The essence of these two technologies is to change the valve variable valve timing and phase to make the engine work in different cycle system modes. Actually, the I-VTEC is much worse structured than the VTEC, but it functions exactly the same.

The i-VTEC is actually an economical cam that generally opens up to 3000 rpm and saves fuel by reducing air intake. Its function is similar to that of Mazda's collapse and the creation of the Blue Sky. In order to achieve a dual-cycle rollover consisting of an Atkinson cycle and an Aalto cycle system, the Fit L15 engine added in-cylinder direct injection and i-VTEC.

Its function is worse than that of the Skyactiv, as well as Honda's machinery and Mazda's electronic control, so Honda's stability is better than Mazda's, and Honda's engine power output is better than Mazda's. Keep in mind that the effect of IVTEC is fuel efficient, and it can be turned on within 3000 rpm.

Millions of car purchase subsidies.