Wheel Pulse Speed Inspection Without Roller Equipment

Solution Overview

Problem

Conventional vehicle speed inspection methods require the use of a roller device to compare vehicle speedometer readings with roller circumferential speed, necessitating equipment setup and space, and there is a need for a method that can perform speed inspection without such devices.

Innovation Solution

An inspection method that involves acquiring target pulse numbers from a vehicle's wheel rotation using sensors while the vehicle runs a predetermined distance, comparing these pulses with reference pulse numbers to determine vehicle speed abnormalities, and performing inspections without a roller device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a roller device is used to compare vehicle speedometer readings with roller circumferential speed, then vehicle speed inspection can be performed, but equipment setup and space requirements increase

Engineering Contradiction:

Improvevehicle speed inspection accuracyVSAvoidspace requirements

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent extracts the essential measurement function from the complex roller device. Instead of using a physical roller to rotate alongside the vehicle wheel, the invention uses a sensor to detect pulses from the vehicle's own wheel rotation. This extracts only the necessary pulse counting function while eliminating the bulky roller mechanism, thereby reducing space requirements while maintaining inspection capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical roller system with an electronic sensing system. The roller device that physically rotated alongside the wheel is substituted with a sensor that electronically detects wheel rotation pulses. This substitution eliminates the need for mechanical contact and large physical infrastructure, reducing space requirements while preserving the ability to measure vehicle speed accurately

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If a roller device is used for vehicle speed inspection, then speed comparison can be performed, but device complexity and equipment setup increase

Engineering Contradiction:

Improvevehicle speed inspection accuracyVSAvoidequipment setup

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the essential measurement function from the complex roller device. Instead of using a physical roller to rotate alongside the vehicle wheel, the invention uses a sensor to detect pulses from the vehicle's own wheel rotation. This extracts only the necessary pulse counting function while eliminating the bulky roller mechanism, thereby reducing space requirements while maintaining inspection capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical roller system with an electronic sensing system. The roller device that physically rotated alongside the wheel is substituted with a sensor that electronically detects wheel rotation pulses. This substitution eliminates the need for mechanical contact and large physical infrastructure, reducing space requirements while preserving the ability to measure vehicle speed accurately

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If the vehicle runs on a roller to perform speed inspection, then speed measurement can be performed, but the inspection process requires higher speeds and separate movement

Engineering Contradiction:

Improvevehicle speed inspection accuracyVSAvoidinspection efficiency

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent merges the vehicle movement function with the inspection function. Instead of requiring the vehicle to run on a separate roller inspection device, the system counts pulses from the vehicle's own wheel rotation during normal movement between work positions. This combines transportation and inspection into a single process, eliminating the need for separate high-speed running phases and improving overall productivity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The vehicle uses its own wheel rotation to generate the measurement pulses needed for inspection. The vehicle's normal driving motion serves dual purposes: both transporting the vehicle between positions and providing the rotational data for speed inspection. This self-service approach eliminates the need for external roller devices and separate inspection procedures

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260063664A1Inspection method

Publication Date: 2026.03.05 TOYOTA JIDOSHA KK

AI summary

In an inspection method, a target pulse number indicating a number of a plurality of pulses in accordance with rotation of a wheel of a vehicle is acquired. The plurality of pulses is output from a sensor while the vehicle runs a predetermined reference distance. The acquired target pulse number and a predetermined reference pulse number are compared to one another to determine an abnormality related to vehicle speed of the vehicle.