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A hydraulic multi-mode variable valve drive system

A multi-mode, valve technology, applied in the direction of engine components, machines/engines, non-mechanical actuated valves, etc., to achieve the effect of independent and flexible value selection

Inactive Publication Date: 2019-11-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no variable valve drive system that can meet the above requirements

Method used

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  • A hydraulic multi-mode variable valve drive system
  • A hydraulic multi-mode variable valve drive system
  • A hydraulic multi-mode variable valve drive system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] figure 1 is a schematic diagram of the hydraulic multi-mode variable valve actuation system. figure 2 It is a schematic diagram of the mode switch in four-stroke mode. image 3 is a schematic diagram of the mode switch spool. Figure 4 are the A-A and G-G cross-sections of the mode switcher. Figure 5 to Figure 9 They are schematic diagrams of the B-B section, C-C section, D-D section, E-E section and F-F section of the mode switcher in the four-stroke mode. This hydraulic multi-mode variable valve drive system mainly includes a low pressure source 1, a cam 2, a plunger pump 3, an oil delivery check valve 4, a mode switch 5, an oil drain valve 6 and a valve driver 7. The mode switch 5 has a spool 5a and a case 5b. The casing 5b is provided with an oil supply port 5IN, an oil discharge port 5OUT and a drive port 5A, and the valve core 5a is provided with a two-stroke oil drain groove 5a1, a four-stroke oil drain groove 5a2, an oil supply groove 5a3, a two-stroke dri...

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Abstract

A hydraulic multi-mode variable valve drive system belongs to the field of engine valve drive. It mainly includes low pressure source, oil delivery check valve, cam, plunger pump, valve driver, oil drain valve, mode switcher. The mode switch includes a spool provided with a two-stroke oil drain groove, a four-stroke oil drain groove, an oil supply groove, a two-stroke drive groove and a four-stroke drive groove, and a casing provided with an oil supply port, an oil drain port and a drive port. By controlling the axial position of the spool of the mode switch, the switch between the four-stroke mode and the two-stroke mode can be realized; in cooperation with the camshaft phasing mechanism, the switch between the driving mode and the braking mode can be realized; by controlling the oil drain valve The opening and closing state of the piston pump can realize flexible variable valve events; according to the four-stroke mode and the two-stroke mode of the model, the time when the plunger pump starts to supply oil and starts to drain is flexibly selected, and the values ​​of the above parameters are no longer affected by the cam. Line restrictions.

Description

technical field [0001] The invention relates to a hydraulic multi-mode variable valve drive system, which belongs to the field of engine valve drive. Background technique [0002] The increasingly stringent laws and regulations on energy saving, emission reduction and vehicle safety are driving the rapid development of new engine technologies. Because of their potential to improve engine performance, technologies such as variable valve, variable stroke number, cylinder deactivation, auxiliary braking, variable combustion mode, and variable compression ratio have received extensive attention. The research trend at home and abroad is to study the synergistic effect of these technologies on engine performance. Obviously, it is not feasible to apply the existing execution systems of various technologies to the engine at the same time. All these technologies can be realized by the combination of electronically controlled fuel injection technology and sufficiently flexible variab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L9/02F01L13/06F01L9/10F01L9/40
CPCF01L13/06F01L9/10
Inventor 崔靖晨隆武强王阳
Owner DALIAN UNIV OF TECH