Brake System Pedal Stroke Threshold Control
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Solution Overview
Problem
Conventional electronic brake-by-wire systems face challenges in maintaining stable braking force due to variations in brake pedal stroke amount caused by driver input, leading to unintended acceleration or deceleration and increased driver stress during braking operations.
Innovation Solution
A brake system that includes a brake pedal, a sensor to detect the stroke amount, and an electronic control device to control the braking force within predetermined thresholds, ensuring a constant braking force is applied when the pedal stroke is between defined thresholds, allowing for smooth braking with simpler pedal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic brake-by-wire system is used to control braking force, then braking control precision is improved, but driver stress increases due to unintended acceleration or deceleration
Solution Approach 1:
The system implements feedback control by continuously monitoring the actual braking force through stroke amount detection and comparing it with the target braking force. The control device adjusts the braking force in real-time based on the detected deviations, ensuring stable braking performance and eliminating unintended acceleration or deceleration that causes driver stress.
Solution Approach 2:
The brake system performs self-correction by automatically detecting stroke amount variations and adjusting braking force without requiring additional driver input. The control device autonomously compensates for deviations from the target braking force, making the system self-regulating and eliminating harmful effects like unintended vehicle motion.
2Ease of operation
If brake pedal stroke amount varies due to driver input, then ease of operation is improved, but braking force stability deteriorates
Solution Approach 1:
The system uses feedback control to monitor the actual braking force generated from variable pedal stroke amounts. The control device continuously adjusts the braking force to match the target value, allowing drivers to operate the pedal freely while maintaining stable braking performance through automatic correction of stroke amount variations.
Solution Approach 2:
The control device dynamically adjusts braking force parameters based on detected stroke amount variations. By changing the braking force parameter in response to pedal input variations, the system maintains stable braking performance while preserving the ease of pedal operation that drivers expect.
3Device complexity
If conventional brake system is used without electronic control, then device complexity is reduced, but braking force stability deteriorates due to pedal stroke variations
Solution Approach 1:
The patent introduces a relatively simple feedback control mechanism that detects brake pedal stroke amount and automatically adjusts braking force. This minimal electronic control system provides sufficient stabilization to compensate for pedal variations while adding only necessary complexity to achieve the desired braking force stability.
Data Source
AI summary
A brake pedal is operated by a pedal force of a driver. A sensor is capable of detecting a stroke amount of the brake pedal. A brake circuit generates braking force to apply a brake to a vehicle by applying hydraulic pressure to wheel cylinders provided to respective wheels. An electronic control device controls the braking force generated by the brake circuit based on an output signal from the sensor and a state of the vehicle. The electronic control device executes predetermined braking force control under which the braking force generated by the brake circuit is set to be predetermined braking force, when the stroke amount of the brake pedal is between a first threshold and a second threshold larger than the first threshold.