Saddle-Type Vehicle Brake Override for Stable Automatic Control
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Solution Overview
Problem
Conventional brake systems that enable automatic control based on sensor information may reduce braking force when a small operation force is applied to the brake operating element, negatively impacting vehicle behavior.
Innovation Solution
A brake system that includes a control device to maintain automatic control if the applied operation force is less than the automatic control-generated force and switch to manual control if the operation force is equal to or greater than the automatic control-generated force, with specific conditions for canceling automatic control during turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system cancels automatic control in response to any operation on the brake operating element, then the driver's input is always respected, but small operation forces will reduce braking force and negatively impact vehicle behavior
Solution Approach 1:
The system changes the parameter of operation force magnitude to determine control mode. When the operation force exceeds a threshold value, the system switches from automatic control to manual control. This parameter-based differentiation allows the system to distinguish between intentional driver input requiring override and minor adjustments that should not cancel automatic control, thereby resolving the contradiction between ease of operation and vehicle behavior stability.
2Reliability
If the system maintains automatic control during driver operation, then vehicle behavior remains stable, but the driver's braking intent may not be fully executed
Solution Approach 1:
The system uses the threshold value of operation force as a parameter to adapt its control behavior. When the operation force is below the threshold, automatic control is maintained for stability. When the operation force exceeds the threshold, the system adapts by switching to manual control to fully execute driver intent. This parameter-based adaptation resolves the contradiction between maintaining stability and responding to driver input.
3Ease of operation
If automatic control is canceled during turns by reducing front-wheel brake pressure, then the system responds to driver input, but sudden pressure reduction may cause vehicle instability
Solution Approach 1:
The system applies periodic or staged action by gradually reducing brake fluid pressure over time rather than sudden complete release. The control device reduces pressure in a controlled manner during turns, allowing the vehicle to maintain stability while still responding to driver input. This staged approach resolves the contradiction between driver control and vehicle stability during turning maneuvers.
Data Source
AI summary
To provide a brake system for a saddled vehicle that ensures vehicle's stable behavior when a brake operating element is operated during automatic control. A brake system for a saddled vehicle includes: a control device exerting automatic control over a brake fluid pressure; and a front-wheel brake operating element and a rear-wheel brake operating element for a driver to manually operate a front-wheel brake and a rear-wheel brake. When an operation force is applied to at least one of the front-wheel brake operating element and the rear-wheel brake operating element while the front-wheel brake and the rear-wheel brake are under automatic control of the control device, if a brake fluid pressure corresponding to the operation force is less than a brake fluid pressure generated by the automatic control, the control device maintains the automatic control, and if a brake fluid pressure corresponding to the operation force is equal to or greater than a brake fluid pressure generated by the automatic control, the control device cancels the automatic control and generates the brake fluid pressure corresponding to the operation force.