Motorcycle Brake Control During Automatic Speed Control Cancellation
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Solution Overview
Problem
Automatic speed control in straddle-type vehicles can cause unintended decreases in braking force when a rider performs a brake operation, leading to rider discomfort.
Innovation Solution
A control device and method that independently control braking forces on the front and rear wheels, allowing automatic speed control to continue despite rider brake operations, by generating additional braking forces on the other wheel based on the rider's intended brake operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic speed control is canceled in response to a brake operation using the brake operating portion for the other wheel, then the automatic speed control can be properly canceled, but the braking force automatically generated on one wheel is released causing a decrease in total braking force
Solution Approach 1:
The braking system is divided into independent front and rear wheel braking controls. The control device separately manages the braking force on each wheel, allowing the braking force on one wheel to be maintained independently when the other wheel's brake is operated. This segmentation enables the system to respond to rider input on one wheel without automatically releasing the braking force on the other wheel, thus maintaining total braking force while still canceling automatic speed control appropriately.
2Ease of operation
If the automatic speed control is canceled upon brake operation, then the system responds to rider input, but it causes unintended decrease in braking force leading to rider discomfort
Solution Approach 1:
The control device applies different control strategies to different wheels based on local conditions. When a rider operates one brake, the system maintains braking force on the other wheel through independent control, providing localized braking force maintenance. This local quality approach ensures that the braking force is not uniformly released across both wheels, preventing the unintended decrease in total braking force that causes rider discomfort, while still responding appropriately to the rider's input on the operated wheel.
Data Source
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AI summary
A decrease in braking force, which is not intended by a rider, is suppressed. An execution section of a control device executes automatic speed control to automatically control a speed of a straddle-type vehicle. In a state where a braking force acting on a rear wheel does not depend on a brake operation using a first brake operating portion and a braking force acting on a front wheel does not depend on a brake operation using a second brake operating portion, in a situation where a braking force is automatically generated on at least one of the front wheel and the rear wheel by the automatic speed control, when the automatic speed control is canceled in response to an automatic speed control cancellation operation that is a brake operation using the brake operating portion for the other of the front wheel and the rear wheel without using the brake operating portion for the one wheel, the execution section executes a first control operation that automatically generates a braking force on the one wheel in a state where a braking force dependent on the brake operation using the brake operating portion for the other wheel acts on the other wheel.