Motor-Driven Brake System Parking Force Prediction
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Solution Overview
Problem
Motor-driven brake systems with parking brake functions face inefficiencies in power consumption due to continuous monitoring and re-operation requirements to maintain braking force, especially when brake pad temperature causes a reduction in pressing force over time.
Innovation Solution
Implementing an elapsed time measuring system and pressing force detecting means to predict when the braking force will decrease to the required level, allowing for earlier power supply cessation to the parking brake mechanism, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is operated to generate a pressing force slightly higher than the required pressing force, then the parking brake function is initially satisfied, but the pressing force gradually reduces over time due to brake pad contraction, requiring continuous re-operation and power consumption
Solution Approach 1:
The system performs preliminary action by operating the parking brake in advance to generate a pressing force higher than the required level, accounting for the future contraction of brake pads. This preliminary over-pressurization ensures that even after thermal contraction occurs, the pressing force remains above the threshold required for reliable parking brake function, thereby avoiding the need for continuous monitoring and re-operation.
Solution Approach 2:
The system dynamically adjusts the initial pressing force based on the expected thermal behavior of the brake pads. By applying a higher initial pressing force that compensates for anticipated contraction, the system adapts to the changing physical state of the brake pads over time without requiring active intervention, thus reducing power consumption while maintaining reliability.
2Reliability
If the pressing force is set to be large to compensate for temperature lowering, then the parking brake function is maintained, but the caliper size must be increased to ensure durability
Solution Approach 1:
The system applies partial or excessive action by generating a pressing force that is temporarily higher than the minimum required level. This excessive initial pressing force compensates for the expected contraction of brake pads due to cooling, ensuring that the pressing force remains sufficient throughout the parking brake operation without requiring an oversized caliper structure.
Solution Approach 2:
The system changes the parameter of pressing force dynamically by initially setting it to a higher value that accounts for thermal contraction. This parameter adjustment allows the use of a standard-sized caliper while maintaining reliable parking brake function throughout the cooling period, avoiding the need to increase caliper size.
3Reliability
If continuous monitoring of pressing force is performed to detect when re-operation is needed, then the parking brake function is maintained, but power consumption increases
Solution Approach 1:
The system eliminates continuous monitoring by performing preliminary action - setting the initial pressing force to a level that guarantees sufficient braking force throughout the expected cooling period. This approach removes the need for ongoing detection and re-operation, significantly reducing power consumption while maintaining reliable parking brake function.
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 allows for reduced power consumption by predicting when the braking force will reach the required level, enabling earlier power supply stoppage and minimizing unnecessary re-operations of the parking brake, thus optimizing energy use.
Implementation Method 1
the pressing force of the brake pads changes with time during application of the parking brake, as a result of contraction of the brake pads as their temperature lowers
Data Source
AI summary
A motor-driven brake system includes a brake body for enabling brake pads to be pressed against a disk rotor attached to a member which supports a wheel of a vehicle, the brake pads being adapted to be driven by an electric device; a pressing-force maintaining mechanism for maintaining the pressing force generated by the brake body; a pressing-force detecting device adapted to detect the pressing force generated by the brake body; and a control device for controlling the electric device and the pressing-force maintaining mechanism, the control device including an elapsed time measuring device adapted to measure elapsed time during a parking brake operation; and a pressing-force reduction predicting device adapted to predict, based on the elapsed time measured by the elapsed time measuring device and a value of a pressing force, a magnitude of the pressing force generated by the brake body after the elapsed time.