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Method to control electromechanical valves

a technology of electromechanical valves and valves, applied in the direction of non-mechanical valves, machines/engines, valve operating means/release devices, etc., can solve the problem of electrical energy consumed in actuation of electromechanical valves, and achieve the effect of more intake turbulen

Inactive Publication Date: 2008-07-22
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]A primary advantage of the present invention is that the amount of energy utilized in actuating a valve is approximately half of prior art actuation methods.
[0009]According to an aspect of the present invention, the valve may be opened for a period of time over which the valve oscillates between a nearly open position and a nearly closed position. Compared with prior methods in which the valve is maintained in a fully open position for the entire duration of opening, the present invention provides more intake turbulence to the incoming air stream by virtue of the air being inducted past an intake valve which is at a half open position, on average.

Problems solved by technology

However, a drawback to electromechanical valves is the amount of electrical energy consumed in actuating them.

Method used

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  • Method to control electromechanical valves
  • Method to control electromechanical valves
  • Method to control electromechanical valves

Examples

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Embodiment Construction

[0018]In FIG. 1, a single cylinder 13 of an internal combustion engine 10 with an electromechanical intake valve 20 and exhaust valve 19 is shown. Engine 10 contains a piston 14 which reciprocates within cylinder 13. Intake valve 20, disposed in cylinder head 22, is opened to allow gases to communicate between the combustion chamber (the volume enclosed by cylinder 13, piston 14, and cylinder head 22) and intake port 70. When exhaust valve 19 is opened, gases are released from the combustion chamber into exhaust port 72. In the embodiment shown in FIG. 1, fuel is injected into intake port 70 by injector 16, a configuration commonly called port fuel injection. However, the present invention applies to any fuel delivery method, including direct injection, central injection, and carburetion. Intake valve 20 and exhaust valve 19 are actuated electromechanically by valve actuators 18 and 17, respectively. In a preferred embodiment, engine 10 is a spark-ignited engine, spark plug 12 initi...

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PUM

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Abstract

A system for controlling electromechanical of an internal combustion has a valve-closing electromagnet for attracting the armature coupled to the valve to close the valve, a valve-opening electromagnet for attracting the armature to open the valve, a valve-opening spring for biasing the valve open, and a valve-closing spring for biasing the valve closed. The method includes de-energizing the valve-closing electromagnet for a predetermined time, enabling the valve to oscillate by the valve springs, and then energizing the valve-closing electromagnet to close the valve. Consequently, only the valve-closing electromagnet is energized to open and close the valve. The valve biasing springs force the valve to a location at which the valve-closing electromagnet can close the valve. This provides an electrical energy over prior methods in which both the valve-opening and valve-closing electromagnets are energized to actuate the valve.

Description

BACKGROUND OF INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to a method for controlling electromechanical valves in an internal combustion engine.[0003]2. Background of the Invention[0004]An electromechanically operated poppet valve in the cylinder head of an internal combustion, as disclosed in U.S. Pat. No. 4,455,543, is actuated by energizing and de-energizing electromagnets acting upon an armature coupled to the poppet valve. Because the actuation of the electromagnets is controlled by an electronic control unit, valve opening and closing events occur independently of engine rotation. In conventional engines with camshaft actuated valves, which have timings based on engine rotation, air delivery to the cylinders is controlled by a throttle valve placed in the inlet duct of the engine. In contrast, electromechanical valves are capable of controlling air delivery based on valve timing, thereby providing a thermal efficiency improvement over ...

Claims

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Application Information

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IPC IPC(8): F01L9/04F01L9/20F02B1/12
CPCF02B1/12F01L2009/2136F01L2009/2169F01L9/20
Inventor BREHOB, DIANA D.CURTIS, ERIC WARRENSTOCKHAUSEN, WILLIAM FRANCIS
Owner FORD GLOBAL TECH LLC