System and method for valve seat injection

Abstract

The invention provides a system and method for valve seat injection. Methods and systems are provided for implementing fluid injection through a cylinder valve seat. The engine system may include a cylinder valve with a valve head mating with a valve seat when the valve is closed. The valve seat includes an injection orifice blocked by the valve head when the cylinder valve is closed and unblockedwhen the cylinder valve is opened.

Description

technical field [0001] The present description generally relates to methods and systems for injecting fluid into a cylinder through an orifice in a valve seat. Background technique [0002] Internal combustion engines have been designed with multi-fuel capabilities. In some cases, the injection of multiple fuels may be coordinated during the combustion cycle. Engines have, for example, utilized mixtures of ethanol and water to improve combustion efficiency and reduce emissions. Water is used to provide targeted cooling of the intake charge to increase charge density. Specifically, water has the potential to reduce nitrogen monoxide (NO) and carbon monoxide (CO) emissions in exhaust. Ignition of alcohol during combustion additionally allows for increased power output. Exhaust systems have also used fluid injection systems to inject diesel exhaust fluid into the exhaust upstream of the catalyst to reduce nitric oxide concentrations. [0003] US 9,777,646 discloses an engi...

AI Technical Summary

Problems solved by technology

In general, adding these additional injection systems increases the potential failure modes of the engine, thereby reducing engine life

Furthermore, it is costly to manufacture an engine with a secondary injection system

For example, water and / or alcohol injection systems separate from gasoline injection systems require separate flow paths, expensive components, etc.

Additionally, the injection system can add to the engine's profile and cause engine packaging issues

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