Vehicle Controller Preventing Inertial Torque Skid

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Solution Overview

Problem

Vehicles experience excessive inertial torque on the output shaft of the power transmission mechanism when transitioning from low-friction to high-friction surfaces, leading to potential skidding and increased stress on the power transmission components.

Innovation Solution

A vehicle controller system comprising a wheel speed sensor, skid sensor, upper limit calculator, and motive power controller that detects wheel skidding, calculates an upper limit rotational speed, and adjusts motive power output to prevent excessive rotational speed and thus inertial torque.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the vehicle transitions from low-friction to high-friction surface, then the driving wheels gain better traction, but excessive inertial torque is generated on the output shaft causing skidding and stress on power transmission components

Engineering Contradiction:

Improvevehicle stabilityVSAvoidinertial torque on output shaft

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The controller calculates an upper limit rotational speed before skidding occurs and proactively controls the driving source to maintain wheel speed below this limit. By detecting wheel speed and anticipating skidding conditions, the system adjusts motive power in advance to prevent excessive inertial torque generation on the output shaft.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The controller continuously monitors wheel rotational speed and uses this feedback to adjust the motive power output from the driving source. When wheel speed approaches the calculated upper limit, the controller reduces power transmission to prevent skidding and excessive inertial torque, creating a closed-loop control system that maintains vehicle stability.

Inventive Principle:

Principle #23Feedback

2Speed

If the motive power is increased to improve acceleration, then the vehicle speed increases, but the inertial torque on the output shaft becomes excessive causing skidding

Engineering Contradiction:

Improvevehicle speedVSAvoidskidding

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The controller dynamically adjusts the motive power output based on real-time wheel speed conditions and calculated upper limits. Rather than using fixed power transmission, the system continuously modifies power delivery to maintain wheel speed below the skidding threshold, enabling safe acceleration while preventing skidding on varying road surfaces.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8965658B2Vehicle controller and method for controlling vehicle

Publication Date: 2015.02.24 HONDA MOTOR CO LTD

AI summary

A vehicle controller includes a wheel speed sensor, a skid sensor, an upper limit calculator, and a motive power controller. The wheel speed sensor is configured to detect rotational speed of driving wheels. The skid sensor is configured to determine whether or not the driving wheels are skidding based on an output of the wheel speed sensor. The upper limit calculator is configured to calculate an upper limit of rotational speed of the driving wheels if the skid sensor determines that the driving wheels are skidding. The motive power controller is configured to control motive power output from the driving source so that rotational speed of the driving wheels is equal to or smaller than the upper limit calculated by the upper limit calculator.