Method for shutting down the internal combustion engine of a series hybrid vehicle.

By optimizing the crank angle for stopping the internal combustion engine in a series hybrid vehicle through regenerative braking and fuel cutoff, the method effectively minimizes vehicle floor vibrations and ensures consistent operation.

JP2026055147APending Publication Date: 2026-03-31NISSAN MOTOR CO LTD
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-18
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing methods for stopping an internal combustion engine in a series hybrid vehicle fail to adequately address vehicle floor vibrations caused by resonance, particularly when the engine repeatedly starts and stops during driving, due to increased oxygen storage in the catalyst and variations in vibration characteristics.

Method used

A method that includes stopping fuel injection and ignition, and initiating regenerative braking of the generator at an optimized crank angle to minimize vehicle floor vibrations by optimizing crankshaft rotational deceleration, thereby reducing resonance.

Benefits of technology

Stable and consistent suppression of vehicle floor vibrations is achieved by initiating the stopping process at a predetermined crank angle, ensuring reproducible and minimal vibrations during engine stops and restarts.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2026055147000001_ABST
    Figure 2026055147000001_ABST
Patent Text Reader

Abstract

In series hybrid vehicles, this suppresses vehicle floor vibrations that occur when the internal combustion engine is stopped. [Solution] When a request is made to stop the internal combustion engine, a stopping process is performed that includes stopping fuel injection and ignition, and regenerative braking of the generator, to completely stop the rotation of the crankshaft. The correlation between the crank angle at which the stopping process is initiated and the vehicle floor vibration is determined by experiment or simulation, and the best crank angle θ that minimizes the vehicle floor vibration is determined in advance. During actual vehicle operation, when a request is made to stop the internal combustion engine (S1), the negative pressure is increased (S2, S3), and when the crank angle falls within a predetermined crank angle range (θ±α) (S4, S5), the stopping process is initiated (S6).
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Control system of internal combustion engine

    JP2005351215A