Vehicle Brake Apparatus Pitch Motion Control
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Solution Overview
Problem
The existing brake systems, such as hydraulic pressure brake systems with ABS, face an issue where quick braking leads to increased braking distance due to pitch motion caused by the vehicle's mass center position, resulting in longer deceleration and potential wheel slip or locking.
Innovation Solution
A brake apparatus and method that includes a detector for monitoring brake pedal operation, vehicle speed, and deceleration, a controller to determine braking status, and selectively performs pitch motion control or ABS control. The controller limits and gradually increases braking force when the pitch coefficient exceeds predetermined values to minimize pitch motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high hydraulic brake pressure is supplied to driving wheels to reduce braking distance, then deceleration is improved, but pitch motion increases causing wheel slip or locking
Solution Approach 1:
The brake control system dynamically adjusts braking force distribution based on real-time vehicle state detection. The controller monitors deceleration rate and pitch coefficient, continuously modifying brake pressure to front and rear wheels to maintain optimal braking without exceeding friction limits, thereby preventing wheel slip while maximizing deceleration.
Solution Approach 2:
The system employs feedback control by detecting wheel slip conditions and pitch motion through sensors, then adjusting hydraulic brake pressure accordingly. The controller receives feedback on actual braking performance and pitch coefficient, modifying brake force distribution in real-time to prevent wheel locking while maintaining short braking distance.
2Reliability
If ABS control is performed to prevent wheel slip, then wheel slip prevention is improved, but braking distance increases due to reduced hydraulic brake pressure
Solution Approach 1:
The system applies different brake control strategies to front and rear wheels based on their individual slip conditions and the vehicle's pitch state. The controller independently adjusts brake pressure to each axle, allowing optimal slip prevention at each wheel while maintaining overall braking efficiency, rather than applying uniform ABS control to all wheels.
Solution Approach 2:
The controller performs preliminary pitch motion control by detecting deceleration rate and pitch coefficient before wheel slip occurs. By proactively adjusting brake force distribution based on predicted pitch behavior, the system prevents the conditions that would trigger aggressive ABS intervention, thereby maintaining shorter braking distance while still preventing wheel slip.
3Stability of the object's composition
If pitch motion control is implemented to reduce pitch motion, then vehicle stability is improved, but braking distance increases due to limited braking force
Solution Approach 1:
The pitch motion control system dynamically adjusts braking force distribution based on real-time detection of deceleration rate and pitch coefficient. As pitch motion decreases and vehicle stability improves, the controller progressively increases braking force to maintain optimal deceleration, ensuring that stability gains do not permanently sacrifice braking performance.
Solution Approach 2:
The system maintains continuous useful braking action by seamlessly transitioning between pitch motion control and maximum braking modes. The controller continuously monitors pitch coefficient and adjusts brake force to maintain both vehicle stability and short braking distance, ensuring that pitch control does not create a permanent reduction in braking capability.
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 reduces the braking distance by controlling pitch motion, maintaining vehicle deceleration and preventing wheel slip, thereby improving braking efficiency compared to conventional ABS control alone.
Implementation Method 1
a detector configured to detect driving information including an operation status of a brake pedal, a vehicle speed, and a vehicle deceleration
Implementation Method 2
an anti-lock braking system (ABS) configured to control a braking force supplied to wheels of the vehicle by detecting slip generated at the wheels
Implementation Method 3
a controller configured to determine a braking status of the vehicle from the operation status of the brake pedal detected by the detector, the vehicle speed, and the vehicle deceleration, and configured to selectively perform ABS control or pitch motion control for reducing a pitch motion of the vehicle
Data Source
AI summary
A brake apparatus of a vehicle may include a detector configured to detect driving information including an operation status of a brake pedal, a vehicle speed, and a vehicle deceleration, an anti-lock braking system (ABS) configured to control a braking force supplied to wheels of the vehicle by detecting slip generated at the wheels, and a controller configured to determine a braking status of the vehicle from the operation status of the brake pedal detected by the detector, the vehicle speed, and the vehicle deceleration, and configured to selectively perform ABS control or pitch motion control for reducing a pitch motion of the vehicle according to the braking status of the vehicle.