Vehicular Door Motor Control for Position-Dependent Speed

Solution Overview

Problem

Conventional vehicular opening/closing body control systems face challenges in achieving a proper initial movement speed when closing the opening/closing body, leading to potentially high speeds near the fully closed position, which can be uncomfortable for users and result in unnecessary motor output due to tilting or low temperature conditions.

Innovation Solution

A vehicular opening/closing body control device with a positional information acquisition part, storage for target movement speed values, and a motor control part that adjusts motor output based on position, using a drive start part to initiate motion and a drive part for feedback control to reach target speeds, generating different motor outputs and feedback gains depending on the opening/closing body's position to optimize speed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the motor output is set high to ensure the opening/closing body can start moving even when the vehicle is tilted or subjected to large friction, then the reliability of starting motion is improved, but the movement speed becomes too fast near the fully closed position causing user discomfort

Engineering Contradiction:

Improvereliability of starting motionVSAvoidmovement speed near fully closed position

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The motor output is dynamically adjusted based on the opening/closing body's position. The control device switches between a first motor output (higher) for positions farther from the fully closed position and a second motor output (lower) for positions closer to the fully closed position, optimizing both starting reliability and comfort near the end position

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control device changes the motor output parameter according to position. By detecting the opening/closing body's position and comparing it with reference positions, the system adjusts the motor output from a first value to a second value (or vice versa) to match the required performance at each stage of motion

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the motor output is set high for all positions, then the opening/closing body can reliably start moving under adverse conditions, but unnecessary high output is generated when not needed, reducing energy efficiency

Engineering Contradiction:

Improvereliability of starting motionVSAvoidmotor energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The motor output is dynamically adjusted based on the opening/closing body's position. The control device switches between a first motor output (higher) for positions farther from the fully closed position and a second motor output (lower) for positions closer to the fully closed position, optimizing both starting reliability and comfort near the end position

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control device changes the motor output parameter according to position. By detecting the opening/closing body's position and comparing it with reference positions, the system adjusts the motor output from a first value to a second value (or vice versa) to match the required performance at each stage of motion

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If the motor output is set low for positions close to the fully closed position, then energy efficiency is improved and user comfort is enhanced, but the reliability of starting motion may be compromised under adverse conditions

Engineering Contradiction:

Improvemotor energy consumptionVSAvoidreliability of starting motion

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The motor output is dynamically adjusted based on the opening/closing body's position. The control device switches between a first motor output (higher) for positions farther from the fully closed position and a second motor output (lower) for positions closer to the fully closed position, optimizing both starting reliability and comfort near the end position

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control device changes the motor output parameter according to position. By detecting the opening/closing body's position and comparing it with reference positions, the system adjusts the motor output from a first value to a second value (or vice versa) to match the required performance at each stage of motion

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20210363810A1Vehicular opening/closing body control device

Publication Date: 2021.11.25 MITSUBA CORP

AI summary

Disclosed is a vehicular opening/closing body control device including: a positional information acquisition; a storage part; and a motor control part. The motor control part includes: a drive start part that operates the motor based on the positional information so that the opening/closing body in a stopped state is moved; and a drive part that performs feedback control of the motor based on the positional information and the target value so that the movement speed of the opening/closing body which has been started to move by the drive start part reaches the target value. The drive start part generates a first output in the motor when the opening/closing body is at a first position, and generates a second output smaller that the first output in the motor when the opening/closing body is at a second position closer to a fully closed position than the first position.