Engine control device and engine system

The engine control device stabilizes self-propulsion in limp-home mode by suppressing fuel injection based on engine rotational speed, addressing variations in the throttle valve's default opening.

JP7883972B2Active Publication Date: 2026-07-02KUBOTA CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
KUBOTA CORP
Filing Date
2023-05-19
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

In engine limp-home mode, the throttle valve cannot be electronically controlled, leading to variations in the default opening due to tolerance in the valve rotation mechanism, which affects stable self-propulsion.

Method used

An engine control device that includes a rotational speed detection unit and a calculation unit to suppress fuel injection when the engine rotational speed exceeds a preset limit, thereby maintaining the engine's rotational speed within a stable range.

Benefits of technology

Enables stable self-propulsion in limp-home mode by preventing the engine rotational speed from exceeding a specified limit, ensuring reliable operation even with mechanical default openings.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide an engine control device and an engine device that enable stable self-propulsion in a limp home mode of an engine.SOLUTION: An engine control device 2 comprises: a rotation speed detection unit 24 that detects an engine rotation speed; and a calculation unit 21 that calculates the opening of a throttle valve 61 by an electronic throttle mechanism 6 and an amount of fuel injected by an injector 31. When an engine 3 is operating in a limp home mode, the calculation unit 21 performs a calculation to suppress fuel injection by the injector 31 when the rotation speed of the engine 3 detected by the rotation speed detection unit 24 exceeds a preset limit value.SELECTED DRAWING: Figure 1
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