Brake Fallback Control Using Motor Speed and Current Detection
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Solution Overview
Problem
Conventional brake systems for autonomous vehicles lack a reliable mechanism to detect and respond to abnormal or out-of-control states, which can lead to safety issues and accidents if the electronic brake system fails or becomes uncontrolled.
Innovation Solution
A brake apparatus comprising a master cylinder, a piston pump driven by a motor, and a processor that controls valves and motor operation based on rotating speed and current differences to detect and manage abnormal states, ensuring the system can switch to a fallback mode to maintain braking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electronic brake system is used to enable various braking functions, then braking control versatility is improved, but system reliability deteriorates due to potential failures and lack of driver direct control
Solution Approach 1:
The brake system is divided into two independent subsystems: an electronic brake system (first flow path with first valves) for normal operation and an auxiliary brake system (second flow path with second valves) for emergency situations. This segmentation allows each subsystem to be optimized independently, with the electronic system providing versatility and the auxiliary system providing reliability backup.
Solution Approach 2:
The auxiliary brake system is pre-configured and ready to activate before any failure occurs. The second flow path and second valves are designed in advance to provide immediate backup braking capability if the electronic brake system fails, preventing complete system failure and ensuring safety.
2Measurement precision
If the processor continuously monitors motor parameters to detect abnormal states, then detection capability is improved, but device complexity increases
Solution Approach 1:
The processor continuously monitors motor parameters (rotational speed, current) and compares them against expected ranges, creating a feedback loop that detects abnormalities. When deviations are detected, the system automatically switches to the auxiliary brake system, providing simple yet effective monitoring without requiring complex additional hardware.
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
The solution effectively detects and manages abnormal states, preventing accidents by ensuring the brake system can operate even when the electronic brake system is out of order, thereby enhancing safety and minimizing damage.
Implementation Method 1
a motor configured to provide rotation for linearly moving the piston
Implementation Method 2
a pump including a cylinder block and a piston configured to linearly move in the cylinder block
Data Source
AI summary
A brake apparatus capable of identifying an out-of-order state or an out-of-control state of a brake includes a master cylinder, a pump including a cylinder block and a piston configured to linearly move in the cylinder block, a motor configured to provide force for linearly moving the piston, first valves provided on a first flow path extending from the pump to a wheel cylinder, at least one second valve provided on a second flow path extending from the master cylinder to the wheel cylinder, and a processor configured to control the first valves to open the first flow path, control the second valve to block the second flow path, and control the motor to move the piston. The processor can stop the control of the motor and control the second valve to open the second flow path based on a rotating speed and a driving current of the motor.