Engine Start Synchronization Using Crank Signal Trigger

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Solution Overview

Problem

Existing engine start techniques for vehicles face delays in synchronization tasks after engine restart, limiting the ability to shorten the start time due to synchronization being performed only at specific engine positions like 0°, 180°, 360°, and 540°, leading to inefficiencies in injection and ignition timing.

Innovation Solution

A method where the engine synchronization and first synchronization task are performed immediately after engine start using the stored engine stop position, with the crank signal triggering these actions, allowing for advanced injection and ignition timing calculations and settings, thereby eliminating the need for waiting at specific angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If engine synchronization is performed immediately after engine start from stored stop position, then start time is shortened, but first synchronization task is still delayed until engine reaches specific position (0°, 180°, 360°, 540°)

Engineering Contradiction:

Improvestart timeVSAvoidsynchronization task activation timing

Core Design Contradiction:

Loss of timeVSProductivity

Solution Approach 1:

The patent applies preliminary action by performing the first synchronization task (injection and ignition timing calculation) immediately when the crank signal is first input, before the engine reaches specific positions like 0°, 180°, 360°, or 540°. This preliminary execution of the synchronization task eliminates the waiting period that previously existed, thereby reducing overall start time while ensuring proper engine startup sequence.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If first synchronization task is performed at specific engine positions (0°, 180°, 360°, 540°), then proper synchronization is ensured, but time is wasted up to the first synchronization task after engine synchronization

Engineering Contradiction:

Improvesynchronization accuracyVSAvoiddelay time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs the first synchronization task preliminarily when the crank signal is first detected, rather than waiting for the engine to reach specific angular positions. This preliminary action maintains synchronization accuracy by still using proper reference signals while eliminating the unnecessary delay time that occurred when waiting for predetermined engine positions.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces dynamic adjustment by making the synchronization task execution dependent on the actual crank signal input timing rather than fixed engine positions. This dynamic approach allows the system to adapt to varying engine startup conditions while maintaining reliability, executing the synchronization task at the earliest possible moment based on real-time crank signal detection.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10634079B2Method for improving engine start performance of vehicle

Publication Date: 2020.04.28 HYUNDAI MOTOR CO LTD

AI summary

A method for improving engine start performance of a vehicle performing engine synchronization at the time of the engine start may include performing a first synchronization task from an engine stop position stored when the engine stops in immediately previous traveling, and performing the first synchronization task when a crank signal of a crank sensor is first input to an engine position management (EPM) module.