IF method and system for power machine knock control

By dynamically deactivating and reactivating cylinders based on knock patterns, the engine controls knocking without excessive ignition retardation, enhancing fuel economy and torque output.

DE102015117148B4Active Publication Date: 2026-05-21FORD GLOBAL TECH LLC
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
FORD GLOBAL TECH LLC
Filing Date
2015-10-08
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Spark-ignition internal combustion engines experience knocking events, particularly with lower octane fuels, which are combated by retarding ignition timing, leading to reduced torque output and fuel economy.

Method used

Implementing fast-acting cylinder valve deactivation mechanisms to selectively deactivate cylinders with higher knock rates, adjusting the cylinder deactivation pattern based on individual cylinder knock values, and reactivating them when they cool down, allowing for advanced ignition timing.

Benefits of technology

Reduces the need for excessive ignition retardation, improving fuel economy and torque output by controlling knocking through adaptive cylinder deactivation and activation.

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Abstract

Method for a power machine (10), comprising: to deactivate individual cylinder valve mechanisms according to a cylinder pattern chosen based on a knock value of each cylinder (14) of the power engine (10), wherein the selection involves selecting a first cylinder (14) which has a knock value above a threshold for deactivation, while a second cylinder (14) with a knock value below a threshold remains active during deactivation, characterized by the fact that the first cylinder (14) remains deactivated for a number of power engine cycles, the number being based on the temperature of the first cylinder (14), the number of power engine cycles being increased if the temperature of the first cylinder (14) rises above a threshold, the temperature of the cylinder (14) including a measured or derived cylinder internal temperature.
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