Electric Brake Booster Motor Lock Detection via Position Comparison
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Solution Overview
Problem
The existing electric brake booster systems for vehicles face safety risks due to potential motor lock states caused by mechanical or electrical defects, which can lead to fatal brake system failures if not detected promptly.
Innovation Solution
A method and apparatus that differentiate between brake pressure control and motor position control modes to detect motor lock states by comparing motor position values, utilizing a brake state determination unit, motor position storage, and a motor locked state determination unit, with features like encoder pulse detection and warning systems to ensure fail-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor operates continuously in brake pressure control mode, then brake pressure is maintained, but motor lock state may occur undetected causing safety failure
Solution Approach 1:
The system performs preliminary detection of motor lock state by comparing motor position values at mode transition moments. Before continuing normal operation, the system checks whether the motor is in a locked state by comparing the first position value (from brake pressure control mode) with the second position value (from motor position control mode), preventing undetected lock states from causing safety failures.
Solution Approach 2:
The system implements feedback control by continuously monitoring motor position values and comparing them across different operating modes. The control unit receives position feedback from the encoder, determines mode transitions, and uses this feedback to detect abnormal motor states, enabling the system to respond to potential failures before they compromise brake safety.
2Measurement precision
If motor position is continuously monitored and compared, then motor lock state is detected accurately, but computational load and processing time increase
Solution Approach 1:
The system performs the computationally intensive position comparison operation preliminarily at mode transition moments rather than continuously. By checking motor position values only when transitioning between brake pressure control mode and motor position control mode, the system achieves accurate lock state detection while minimizing processing time and computational load.
Solution Approach 2:
The system implements periodic detection of motor lock state by comparing position values at regular mode transition intervals. This periodic approach maintains detection accuracy by systematically checking motor status while reducing processing requirements compared to continuous monitoring, as comparisons are performed only at predetermined transition points.
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
Enhances brake safety by accurately detecting motor lock states and triggering warnings and fail-safe processes, such as engaging the vehicle anti-skid system, thereby preventing brake system failures.
Implementation Method 1
the first position value may be calculated by detecting a pulse value of an encoder connected to the motor
Data Source
AI summary
Disclosed is a method of detecting a failure of a motor of an electric brake booster. The method includes: a) determining whether the electric vehicle brake booster is in the brake pressure control mode or the motor position control mode; b) storing a first position value of the motor for each of predetermined periods when it is determined that the electric vehicle brake booster is in the brake pressure control mode; c) comparing the first position value stored for the last period among the first position values with a second position value of the motor in the motor position control mode when the brake pressure control mode is changed to the motor position control mode; and d) determining that the motor is in a locked state when the first position value and the second position value are substantially identical.