Electro-hydraulic fully variable air distribution device and control method

Abstract

The invention discloses an electro-hydraulic fully variable air distribution device and a control method, and belongs to the technical field of engine air valves. The electro-hydraulic fully variable air distribution device comprises a buffer control valve, a lift range control valve, a low-pressure oil box, a filter, a hydraulic motor, an energy accumulator, an overflow valve, a solenoid directional valve, an electro-hydraulic fully variable air distribution executor, an electronic control system, and attached components like an oil pipe. A high-pressure oil port, a lift range control port, a buffer control oil port, a cylinder body orifice and five hydraulic cavities (A, B, C, D and E) are formed in the electro-hydraulic fully variable air distribution executor, and by controlling pressure of hydraulic oil in the five hydraulic cavities, movement like the opening and seating of one engine air valve can be realized. By changing power losing and power obtaining hours of a two-position three-way valve, the lift range control valve and the buffer control valve, the opening phase and the opening lift range of the engine air valve can be changed, and soft adjustment on the lift range and the phase of the air valve, and the duration of the opening of the air valve are realized, so that fully variable movement of the air valve is realized.

Description

technical field [0001] The invention belongs to the technical field of engine air valves, and in particular relates to an electro-hydraulic fully variable air distribution device and a control method. Background technique [0002] With the increasing severity of world environmental problems and international energy crisis, it has seriously threatened the sustainable development of human society. With the rapid development of the internal combustion engine industry, people's demand for oil resources is increasing day by day, and the resulting problems such as environmental pollution and energy shortages have also followed one after another. Energy saving and environmental protection have become two important issues that the internal combustion engine industry has to face. question. In order to effectively solve these two problems, countries all over the world have higher and higher requirements for improving engine economy and controlling harmful emissions. Saving fuel and c...

AI Technical Summary

Problems solved by technology

The camless variable valve train developed at this stage has obvious advantages in gas distribution compared with the traditional valve train, but in these camless variable valve trains, the electromagnetic drive method is difficult to meet the high-pressure intake air and valve opening at the same time. According to the requirements of closing frequency and lift, electric drive has strict requirements on sealing, while the fully variable valve drive device driven by electro-hydraulic can break through the restriction of cam profile, realize the flexible adjustment of valve lift and phase, and improve the performance of the engine. The overall performance, so the electro-hydraulic drive is the easiest way to achieve

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