Control Pedal Shaft Sensing for Accurate Displacement Detection

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Solution Overview

Problem

The existing control pedal devices face accuracy issues due to dimensional and assembly variations in components, leading to inaccurate detection of pedal displacement, as the second stroke sensor's output does not accurately reflect the actual pedal operation.

Innovation Solution

A control pedal device design featuring a rotating shaft with multiple targets attached to it, which rotate together with the shaft, and sensor elements to detect the rotation, reducing the impact of component variations on detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If multiple components (stroke simulator, operation rod, etc.) are used to connect the sensor to the pedal arm, then the device complexity increases, but the measurement precision deteriorates due to dimensional and assembly variations

Engineering Contradiction:

Improvenumber of componentsVSAvoidpedal displacement detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent extracts and eliminates the intermediate components (stroke simulator, operation rod, etc.) from the transmission path between the pedal arm and the sensor. By directly attaching the sensor to the pedal arm, the design removes the sources of dimensional and assembly variations, thereby improving measurement precision while reducing device complexity

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the sensor mounting structure directly with the pedal arm, creating an integrated assembly. This consolidation eliminates the need for separate intermediate components and their associated connection interfaces, reducing both device complexity and the accumulation of dimensional tolerances

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If a second stroke sensor is connected via multiple intermediate components, then the ease of manufacture improves through modular assembly, but the reliability deteriorates due to inaccurate detection output

Engineering Contradiction:

Improvemodular assemblyVSAvoiddetection accuracy

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent removes the intermediate components (stroke simulator, operation rod, etc.) that were causing detection inaccuracies. By directly connecting the sensor to the pedal arm, the design eliminates the transmission errors while maintaining manufacturability through simplified assembly

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If dimensional and assembly variations are present in intermediate components, then the ease of operation is maintained, but the measurement precision deteriorates

Engineering Contradiction:

Improvepedal operationVSAvoiddisplacement detection accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent extracts and eliminates the intermediate components that introduce dimensional and assembly variations. By directly attaching the sensor to the pedal arm, the design removes the source of measurement errors while preserving the natural pedal operation characteristics

Inventive Principle:

Principle #2Taking out (Extraction)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enhances the detection accuracy of pedal displacement by directly measuring the rotation of the rotating shaft, minimizing the interference from dimensional and assembly variations, thus improving the reliability of the control pedal device.

Implementation Method 1

multiple sensor elements configured to detect a rotation of the targets

Methodology Applied

Scientific EffectRotational detection:

Data Source

PatentUS20250018904A1Control pedal device

Publication Date: 2025.01.16 DENSO CORP

AI summary

A control pedal device includes: a pedal configured to receive an operation; a pedal arm attached to the pedal to be movable with the pedal; a rotating shaft fixed to the pedal arm; a reaction force generating mechanism exerting a reaction force against the operation of the pedal; multiple targets attached to the rotating shaft and rotating together with the rotating shaft; and multiple sensor elements configured to detect a rotation of the multiple targets.