Energy recovery type electric-hydraulic variable-valve control system

Abstract

The invention discloses a control system for an energy-recovery electro-hydraulic air-changeable door. The control system, which can realize the recovery of energy and recycle, comprises constant pump, one-way valve, safe valve, energy storage device, hydraulic actuator, air door, pressure test device and high-speed switch valve. The hydraulic actuator comprises oil cylinder, piston and piston bar. The constant pump inputs energy to the energy storage device. The one-way valve between the energy storage device and the hydraulic pump can prevent the pressure oil in the energy storage device returning. The high-pressure energy storage device is connected with the pressure port of three-way high-speed switch valve and the left cavity of cylinder is connected with the control port of high-speed switch valve. When the right cavity of cylinder is connected with the oil return port of high-speed switch valve, the oil return port of high-speed switch valve is connected with the low-pressure energy storage device. The energy storage device provides energy to the hydraulic actuator. As the pressure test device measures the pressure value at the outlet of energy storage device, energy is filled in the energy storage device in time so as to decrease the energy consumption of system greatly.

Description

technical field [0001] The invention relates to an internal combustion engine valve control system, in particular to an energy recovery type electro-hydraulic variable valve control system. Background technique [0002] With the improvement of people's quality of life, automobiles have become a common means of transportation in people's daily life. While bringing convenience to people, it also raises a serious problem: high energy consumption and high pollution. The power source of the car is the engine, and the engine is a machine that converts a certain form of energy into mechanical energy. Most of the engines used in modern automobiles are internal combustion engines, which are machines that convert the chemical energy of fuel combustion into thermal energy, and then convert the thermal energy into mechanical energy. To complete this energy conversion process, it generally needs to go through four processes of intake, compression, work, and exhaust. The intake and exha...

AI Technical Summary

Problems solved by technology

While bringing convenience to people, it also poses a serious problem: high energy consumption and high pollution

The camless driving mechanism can be divided into electromagnetic type and electro-hydraulic type. The electromagnetic type uses a pair of electromagnets with springs. In order to improve the frequency response of the system, the vehicle voltage needs to be greatly increased, which brings safety. At the same time, the valve seating buffer cannot be realized, and the vibration is large, which affects the life of the engine

In order to realize the valve lift closed-loop control, high-frequency precision displacement sensors and high-power electronic control devices are required, so the high cost of the system will inevitably affect market promotion.

Electro-hydraulic variable valve technology is divided into servo control, proportional control, and switch control. The variable valve technology of electro-hydraulic servo control was first realized in the laboratory, but it has been eliminated by the industry due to its high cost.

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