Experimental Device for Adjustment of Different Lifts and Different Angles of Engine Variable Intake Valves

Abstract

The invention discloses an experiment device for regulating different angles in a variable valve different lifting method. According to the device, a pair of air inlet cams of each cylinder can produce continuously changing different angles, so the valve lifting difference changes, eddy currents are produced and regulated, and a different angle experiment regulation system is provided for researching influences of the variable valve different lifting method on flowing characteristics of air in cylinders of an engine.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an experimental device for adjusting different lifts and different angles of variable intake valves of engines. Background technique [0002] The four-valve engine has gradually been widely used due to its obvious advantages in improving combustion compared with the two-valve engine. However, due to the symmetrical arrangement of the double intake port structure and the two cam profiles that drive the intake valves, the four-valve engine is almost the same. The two intake valves open to the same degree at the same time, so that the intake velocity and intake air volume of the two intake valves are the same at the same time, and the rotating airflow in the cross-sectional direction of the cylinder block cancels each other out, and the overall movement of the air in the cylinder is expressed as a single longitudinal direction. In the tumble flow mode, there is almost no vortex flow...

AI Technical Summary

Problems solved by technology

[0002] The four-valve engine has gradually been widely used due to its obvious advantages in improving combustion compared with the two-valve engine. However, due to the symmetrical arrangement of the double intake port structure and the two cam profiles that drive the intake valves, the four-valve engine is almost the same. The two intake valves open to the same degree at the same time, so that the intake velocity and intake air volume of the two intake valves are the same at the same time, and the rotating airflow in the cross-sectional direction of the cylinder block cancels each other out, and the overall movement of the air in the cylinder is expressed as a single longitudinal direction. In the tumble mode, there is almost no vortex, and the inability of both vortex and tumble to exist at the same time is an important factor that causes poor mixture formation and poor combustion

However, no matter whether the lift of the two intake cams is reduced at the same time or the lift of one of the intake cams is reduced in the above structure, the vortex phase obtained is still equivalent to partially closing two valves or one of the valves, and its flow capacity is higher than that of the double intake cam. The valve (or intake port) is fully open, and the high vortex intensity is obtained at the expense of the intake air flow. It is only suitable for low speed conditions. At high speeds, the intake air flow is insufficient. Two intake valves must be fully opened to ensure intake air. flow, the above mechanism cannot be used to increase the vortex

[0005] The Chinese patent with the application number 200510013859.7 discloses a device and a related method for different lifts of intake valves of internal combustion engines. It proposes a different lift technology for intake valves to solve the above technical problems. The requirements for vortex motion and flow coefficient are different under load. It is necessary to conduct tests according to the working conditions to determine the different angles of different lifts of the intake valves under different working conditions. The technical solution disclosed in this patent cannot adjust the different generation angles. Therefore, it is necessary to invent a set of engine variable intake valve different lift different angle experimental adjustment device

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