Seating Buffer Type Electromagnetic Fully Variable Valve Control Method

A valve and variable technology, applied in the direction of electrical control, engine control, fuel injection control, etc., can solve problems such as the inability to restrict the valve seating speed, the difficulty of precise valve control, and the harsh working environment of the valve

Active Publication Date: 2021-09-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electromagnetic fully variable valve is a camless structure, and the valve seating speed cannot be constrained by the cam profile.
In the entire electromagnetic drive valve mechanism, the movement of the valve is controlled by the engine management control system in real time. However, due to the harsh working environment of the valve, it is very difficult to accurately control the valve. It is necessary to use an external device to effectively cushion the seat.

Method used

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  • Seating Buffer Type Electromagnetic Fully Variable Valve Control Method
  • Seating Buffer Type Electromagnetic Fully Variable Valve Control Method
  • Seating Buffer Type Electromagnetic Fully Variable Valve Control Method

Examples

Experimental program
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Embodiment Construction

[0016] combine figure 1 , a seat buffer type electromagnetic fully variable valve control system, including a variable damping buffer device 40, an electronic control unit 10, a main control circuit 20, and a linear actuator 30.

[0017] The variable damping buffer device 40 includes a casing, a piston, a coil, and a piston rod. The magneto-rheological fluid is arranged in the casing, the piston is arranged in the casing, and the piston rod is connected to the piston and an external air valve.

[0018] The electronic control unit 10 includes an ECU12, and two current sensing modules electrically connected to the ECU12, a displacement sensing module 14 and a drive circuit 15, and the first current sensing module 13 is also connected to the coil and the solenoid valve in the variable damping buffer device 40. The second current sensing module 11 is also electrically connected to the linear actuator, and the displacement sensing module 14 is also electrically connected to the lin...

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PUM

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Abstract

The present invention provides a seat buffer type electromagnetic fully variable valve control method, and implements the following steps for the rapid deceleration stage and stable seat stage of the valve: in the rapid deceleration stage, collect the peak velocity of the valve, the deceleration distance of the valve, and preset the valve Rapid deceleration target speed, the ECU calculates the damping force generated by the variable damping buffer device according to different peak speeds to change the speed of the valve, periodically collects the real-time speed of the valve, if the real-time speed of the valve is equal to the preset target speed of rapid deceleration of the valve, cancel Generate electromagnetic force; in the stable seating stage: collect the distance between the valve and the valve seat, if it is within the preset range, the ECU will reduce the voltage of the main control circuit of the variable damping buffer device to zero.

Description

technical field [0001] The invention relates to an internal combustion engine technology, in particular to a seat buffer type electromagnetic fully variable valve control system and method. Background technique [0002] It is one of the frontiers of engine design and electronic control technology research using electromagnetic fully variable valves. The engine uses electromagnetic fully variable valves, and the intake valve and exhaust valve are fully flexibly controlled by the engine electronic control unit to realize the independent and continuous adjustment of the engine valve lift, valve opening and closing angle and its motion law. One of the main problems it faces is that the valve seating is difficult to achieve "soft landing", resulting in valve seating shock, resulting in loud noise and reducing the life of the valve and valve seat ring, and even causing violent rebound of the valve, affecting the timely closing of the valve , resulting in difficulty in starting th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L9/20F01L9/40F01L13/00F02D13/02F02D41/00F01L9/21F01L9/26
CPCF01L13/00F02D13/02F01L2009/2103F01L2009/2151F01L9/40F01L9/20Y02T10/12
Inventor 刘梁朱祥彬徐照平郭贺
Owner NANJING UNIV OF SCI & TECH
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