Brake Control Apparatus Antilock Pedal Positioning
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Solution Overview
Problem
Conventional brake control apparatuses fail to properly position the brake operating member during antilock control, leading to an uneasy driving experience and misestimation of road frictional force by the driver.
Innovation Solution
The brake control apparatus controls valves and uses hydraulic pressure generated by a pump to impart a stroke to the piston of the master cylinder, ensuring the brake pedal is properly positioned during antilock control, mimicking the operation of brake systems without a brake-by-wire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional brake control apparatus uses on-off valve control during antilock control, then the system structure is simple, but the brake operating member cannot be brought to a proper position
Solution Approach 1:
The patent introduces a stroke simulator as an intermediary component between the master cylinder and the driver's brake pedal. The stroke simulator includes a piston that can be independently controlled via control valves to move the brake operating member to appropriate positions during antilock control, without requiring direct manipulation of the master cylinder piston. This mediator approach resolves the contradiction by providing position control capability while maintaining relatively simple valve control architecture.
Solution Approach 2:
The patent segments the brake system into distinct functional components: the master cylinder for hydraulic pressure generation, the stroke simulator for pedal position control, and the control valves for coordinating their operation. By separating the position control function into the stroke simulator, the system achieves proper brake operating member positioning during antilock control while keeping the overall device complexity manageable through modular design.
2Reliability
If brake control apparatus does not control piston stroke during antilock control, then the device complexity is low, but the driver experiences unease and misestimates road frictional force
Solution Approach 1:
The patent implements a feedback mechanism where the stroke simulator's piston position is controlled in response to driver's brake operation and antilock control status. The control system monitors the brake operation amount and adjusts the piston stroke accordingly, providing the driver with appropriate tactile feedback that accurately reflects road frictional force conditions. This feedback loop ensures reliable driver information without requiring overly complex hydraulic pressure control.
Solution Approach 2:
The stroke simulator acts as an intermediary that translates hydraulic pressure changes into appropriate brake pedal position feedback for the driver. During antilock control, the mediator component adjusts piston stroke to maintain realistic pedal feel, ensuring the driver receives accurate road frictional force information while the actual wheel slip control is handled by the antilock system. This separation of concerns improves reliability without proportionally increasing device complexity.
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 approach effectively controls the brake pedal position, reducing driver unease and accurately indicating road frictional force, thereby improving the driving experience and road friction estimation.
Implementation Method 1
uses hydraulic pressure generated by a hydraulic pressure source to impart a stroke to a piston of a master cylinder
Data Source
AI summary
To provide a brake control apparatus that brings a brake operating member to a proper position during antilock control.At least during operation of an antilock controller 105, valves 23 and 24 are actuated to impart a stroke to a piston 52P with hydraulic pressure generated by the pump 7.