Shift Drum Angular Sensor Correction for Transmission Control

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Solution Overview

Problem

Conventional transmissions face challenges in accurately detecting the rotation angle of the shift drum, which is crucial for controlling the actuator, due to limitations in angular sensor detection accuracy.

Innovation Solution

A transmission system that includes a shift drum, an angular sensor, and a control unit, where the control unit calculates the rotation angle by using reference values at different rotation angles and corrects the output values based on differences between these values, ensuring accurate detection through linear correlation and precise positioning of the shift drum.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an angular sensor is used to detect the rotation angle of the shift drum, then the actuator can be controlled based on the detected rotation angle, but the detection accuracy of the rotation angle is insufficient

Engineering Contradiction:

Improvedetection accuracy of rotation angleVSAvoidcontrol accuracy of actuator

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The control unit receives the output value from the angular sensor, compares it with reference values stored in memory, calculates the difference, and applies correction to the output value. This feedback mechanism continuously adjusts the detected rotation angle to improve accuracy, ensuring reliable actuator control based on corrected angular data.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the parameter of the output value by applying correction based on the difference between the angular sensor output and reference values. The control unit modifies the detected rotation angle parameter through calculated corrections, transforming inaccurate sensor data into precise rotational position information for reliable actuator control.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the shift drum is directly driven by the actuator via a deceleration gear, then the transmission can be controlled, but highly accurate detection of the rotation angle is difficult to achieve

Engineering Contradiction:

Improvecontrol of transmissionVSAvoiddetection accuracy of rotation angle

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The angular sensor acts as an intermediary between the shift drum and the control unit, providing rotational position data. The control unit then serves as a second intermediary by processing this data through comparison with reference values and applying corrections, ultimately delivering accurate rotational information to control the transmission operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system replaces purely mechanical position indication with an electrical sensing system. The angular sensor converts mechanical rotation into electrical signals, and the control unit processes these signals through computational correction algorithms, substituting mechanical precision requirements with electrical measurement and digital processing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11519501B2Transmission with shift drum, angular sensor outputting rotation of shift drum as output value and control unit correcting output value

Publication Date: 2022.12.06 HONDA MOTOR CO LTD

AI summary

A transmission includes a shift drum, an angular sensor, and a control unit. The control unit has reference values of the output values at a first rotation angle and a second rotation angle of the shift drum. The control unit is configured to obtain the output values at the first rotation angle and the second rotation angle as a first output value and a second output value, respectively. The control unit is configured to correct the output value output between the first rotation angle and the second rotation angle based on a difference between the first output value and the reference value at the first rotation angle and a difference between the second output value and the reference value at the second rotation angle.