Engine system and control method therefor

FI3431740T3Undetermined Publication Date: 2026-07-03IHI POWER SYST CO LTD
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Patent Information

Authority / Receiving Office
FI · FI
Patent Type
Patents
Current Assignee / Owner
IHI POWER SYST CO LTD
Filing Date
2016-03-14
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Fuel gas engines face challenges in rapidly increasing power without causing knocking, due to the inability of turbochargers to follow the increased fuel gas feed rate, leading to insufficient air supply and emission regulation issues, requiring a solution to shorten power-up time while suppressing knocking.

Method used

A 4-stroke engine system with a variable intake valve timing mechanism that advances or retards the intake valve closing timing to lower the compression ratio, using a control unit to set the valve timing based on output shaft power, incorporating a torque sensor and rotational speed sensor for real-time power calculation and adjusting the valve timing to suppress knocking and improve fuel efficiency.

Benefits of technology

The system effectively shortens power-up time and suppresses knocking by lowering the compression ratio, while maintaining fuel efficiency and reducing harmful emissions, allowing the engine to operate within stricter emission regulations.

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Abstract

A fuel-air mixture of a fuel gas and air is combusted in a combustion chamber in a gas mode of a marine dual fuel engine (1). When power of the engine (1) is increased, power is calculated by a control unit (22) from data on a rotational speed and a torque measured by a rotational speed sensor (20) and a torque sensor (21) of a crankshaft (2). Advance of an opening / closing timing of an intake valve (8) is set from a first map (24) and a second map (25) on the basis of the data on the rotational speed and the power. A second electric signal of the opening / closing timing is converted into a pressure by an electropneumatic converter (27) and adjusts a movement amount of a rod using an actuator (28). A variable intake valve timing mechanism (30) is operated on the basis of the movement amount of the rod to adjust the opening / closing timing of the intake valve (8) by advancing the opening / closing timing of the intake valve (8), and control of lowering a compression ratio of a fuel-air mixture is performed. A power-up speed can be increased while preventing knocking by setting advance amount of the opening / closing timing of the intake valve (8) using the first map and the second map in which the advance amount is previously determined.
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