Vehicle Driving System Eccentricity Protection

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Solution Overview

Problem

In vehicle driving systems, the brake may be kept applied for extended periods at slower speeds, potentially harming the unidirectional power transmitting unit, and existing systems lack effective protection mechanisms.

Innovation Solution

A driving system with a unidirectional power transmitting unit and an eccentricity acquiring unit, along with a connection/disconnection unit and controller, which manages the engagement and disengagement of the power transmission based on acquired eccentricity and predetermined conditions to protect the unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the brake is kept applied for extended periods at slower speeds, then the vehicle can maintain connection between drive source and driven portion, but the unidirectional power transmitting unit is damaged

Engineering Contradiction:

Improveprotection of unidirectional power transmitting unitVSAvoidbrake damage to power transmitting unit

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The controller performs preliminary assessment by acquiring eccentricity data before deciding to release the brake. This preliminary action allows the system to predict potential damage and take preventive measures by releasing the brake before significant harm occurs to the unidirectional power transmitting unit.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors eccentricity of the unidirectional power transmitting unit and provides feedback to the controller. Based on this feedback, the controller dynamically adjusts brake application timing, releasing the brake when eccentricity exceeds thresholds to prevent damage while maintaining connection during normal operation.

Inventive Principle:

Principle #23Feedback

2Reliability

If the connection/disconnection unit is frequently disengaged to protect the unidirectional power transmitting unit, then the unit is protected from damage, but torque transfer efficiency decreases

Engineering Contradiction:

Improveprotection of unidirectional power transmitting unitVSAvoidtorque transfer efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system changes the parameter of brake release timing based on eccentricity thresholds rather than using fixed timing. By adjusting when the brake is released according to real-time eccentricity measurements, the system protects the power transmitting unit from damage while minimizing unnecessary disengagements that would reduce torque transfer efficiency.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the brake is released early to protect the unidirectional power transmitting unit, then the unit is protected from damage, but the vehicle speed may drop below predetermined speed

Engineering Contradiction:

Improveprotection of unidirectional power transmitting unitVSAvoidvehicle speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The controller uses real-time eccentricity feedback to determine the optimal timing for brake release. This feedback mechanism allows the system to protect the unidirectional power transmitting unit by releasing the brake when eccentricity indicates potential damage, while the timing is optimized to minimize impact on vehicle speed.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9945446B2Driving system for vehicle

Publication Date: 2018.04.17 HONDA MOTOR CO LTD

AI summary

A driving system for a vehicle includes drive source, a driven portion, a unidirectional power transmitting unit provided on a power transmission path between the drive source and the driven portion, and having a first member, a second member, and an engaging element interposed between the first member and the second member, and an eccentricity acquiring unit adapted to acquire an eccentricity, the eccentricity being a magnitude of deviation between the rotational axis of the first member and the rotational axis of the second member.