Direct injection diesel engines

Abstract

A piston for a four valve direct injection diesel engine defines a combustion chamber comprising a recess (10) in the piston crown, which is rotationally symmetrical about the axis of the piston in axial cross-section and is defined by a base and a side wall. A generally conical projection (5) is upstanding from the base. The recess (10) includes a lower toroidal portion (8) and an upper portion (10), whose diameter progressively increases towards the piston crown. The upper and lower portions of the recess are separated by an annular, arcuate lip (12) extending into the recess. The included angle of the conical projection (5) is between 104 DEG and 108 DEG , the maximum depth of the recess (10) is between 13% and 22% of the diameter of the piston, the conical projection (5) merges with the base of the recess along a circular line whose diameter is between 38% and 44% of the diameter of the piston, the diameter of the lip (12) is between 54% and 59% of the diameter of the piston, the line of minimum diameter of the lip (12) is situated at a distance between 5% and 10% of the diameter of the piston from the plane of the piston crown and the diameter of the upper portion (10) of the recess increases from 54% to 59% of the diameter of the piston at the line of minimum diameter of the lip to between 72% and 76% of the diameter of the piston at the line where the side wall of the recess intersects the plane of the piston crown.

Description

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AI Technical Summary

Benefits of technology

This patented technology helps improve engines' performance without causing problems like excessive emissions or increased wear caused by particulate matter (PM) being deposited onto certain parts inside an internal combustion engine. By positioning injection holes with specific angles relative to these surfaces, it can help reduce harmful exhaust gases produced during operation while also reducing smoke production.

Problems solved by technology

Technologies described in this patented technical problem addressed in the patented text involve improving the performance of internal combustions engines while minimizing harmful emissions during operation without compromising their effectiveness due to poor atomization efficiency caused by noncircuitous sections within the combines used for each stroke cycle. Additionally, the current methods require expensive post treatment processes involving multiple steps before starting up again because they cannot fully mix fuels properly.