Engine Control Device Crankshaft Angular Velocity Battery Deterioration

Solution Overview

Problem

Existing battery state judgment methods, such as comparing battery voltage with a predetermined threshold, fail to accurately assess battery deterioration, especially when the cranking load is high, leading to potential engine starting issues due to misjudgment of battery condition.

Innovation Solution

An engine control device that acquires information equivalent to the angular velocity of the crankshaft before engine start, using the energization time of the ignition coil as an index to judge battery deterioration, considering the cranking load, thereby providing a more accurate assessment of battery state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If battery voltage is compared with a predetermined threshold, then the judgment method is simple, but the battery deterioration state cannot be judged accurately when cranking load is high

Engineering Contradiction:

Improvesimplicity of judgment methodVSAvoidaccuracy of battery deterioration judgment

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent changes the judgment parameter from battery voltage to crankshaft angular velocity. By measuring the angular velocity of the crankshaft during starting, the system can accurately assess whether the battery has sufficient power to overcome the cranking load, directly reflecting the battery's actual starting capability rather than just its voltage level.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces the crankshaft angular velocity as an intermediary parameter that connects battery performance to engine starting capability. The angular velocity measurement serves as a mediator that translates battery power output into a measurable indicator of starting success, accounting for variable cranking loads from gear aging, lubricant viscosity, and other factors.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the threshold is set to a high value, then it can detect battery deterioration, but it may be judged that the battery has deteriorated although the battery still has enough power

Engineering Contradiction:

Improvedetection capability of battery deteriorationVSAvoidaccuracy of battery state assessment

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent changes the judgment parameter from battery voltage to crankshaft angular velocity. By measuring the angular velocity of the crankshaft during starting, the system can accurately assess whether the battery has sufficient power to overcome the cranking load, directly reflecting the battery's actual starting capability rather than just its voltage level.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses the measured crankshaft angular velocity to provide feedback on battery performance. This feedback mechanism allows the system to adaptively assess battery health based on actual starting performance, avoiding false judgments by continuously monitoring whether the crankshaft achieves sufficient rotational speed during engine starting.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If battery voltage is used for judgment, then the measurement is straightforward, but it fails to consider cranking load variations due to gear aging and lubricant viscosity

Engineering Contradiction:

Improvesimplicity of measurementVSAvoidability to account for cranking load variations

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent changes the judgment parameter from battery voltage to crankshaft angular velocity. By measuring the angular velocity of the crankshaft during starting, the system can accurately assess whether the battery has sufficient power to overcome the cranking load, directly reflecting the battery's actual starting capability rather than just its voltage level.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces the crankshaft angular velocity as an intermediary parameter that connects battery performance to engine starting capability. The angular velocity measurement serves as a mediator that translates battery power output into a measurable indicator of starting success, accounting for variable cranking loads from gear aging, lubricant viscosity, and other factors.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP2877729B1Engine control device and vehicle including the same

Publication Date: 2016.07.27 YAMAHA MOTOR CO LTD

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AI summary

An engine control device that controls an engine including a starter motor to be driven by electric power supplied from a battery and a crankshaft. The engine control device comprising an angular velocity-equivalent information acquiring means that acquires information equivalent to an angular velocity of the crankshaft before starting of the engine is completed when starting the engine by actuating the starter motor, and a battery deterioration judging means that judges that the battery has deteriorated when information acquired by the angular velocity-equivalent information acquiring means is equivalent to an angular velocity of a predetermined value or less.