Starting an engine with electromechanical valves

a technology of electromechanical valves and engine, which is applied in the direction of engine starters, electric control, machines/engines, etc., can solve the problems of engine misfire, engine emissions variation, engine operation confidence and satisfaction reduction, etc., to reduce customer confidence and satisfaction regarding vehicle operation, engine emissions variation
US20050205036A1Active Publication Date: 2005-09-22FORD GLOBAL TECH LLC
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Patent Information

Authority / Receiving Office
US ยท United States
Patent Type
Applications(United States)
Current Assignee / Owner
FORD GLOBAL TECH LLC
Publication Date
2005-09-22

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Abstract

A system and method to control engine valve timing to during the start of an internal combustion engine. Electromechanical valves are controlled in a manner to reduce engine vibration and hydrocarbon emissions during the start of an internal combustion engine. The method controls valves without an explicit four-stroke engine cycle during a start.
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Description

FIELD

[0001] The present description relates to a method for starting an internal combustion engine and more particularly to a method for controlling electromechanical intake and / or exhaust valves to improve starting of an internal combustion engine. BACKGROUND AND SUMMARY

[0002] Engine starting has a significant impact on engine emissions and driver satisfaction. Inconsistencies in audible engine sound and engine vibration transmitted through the vehicle chassis may reduce customer confidence and satisfaction regarding vehicle operation. In addition, inconsistent air-fuel mixture preparation during a start can produce variation in engine emissions. For example, hydrocarbons may be increased by rich mixtures or by excessively lean mixtures that may cause the engine to misfire.

[0003] Conventional mechanically driven valve trains operate the intake and exhaust valves based on the position and profile of lobes on a camshaft. The engine crankshaft is connected to the pistons by connect...

Claims

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