EMB Motor ABS Control to Limit Heat on Long Downhill Braking
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Solution Overview
Problem
The electro mechanical brake (EMB) motor reaches a heat generation limit during rapid repetitions of slip control and release due to anti-lock brake system (ABS) operation on high-temperature long downhill roads, leading to potential safety issues like torque limit or motor seizure.
Innovation Solution
A method and apparatus to control the heat generation of the EMB motor by minimizing the number of drive and stop repetitions through an optimized ABS operation mode, including controlled stop sections and torque management, using sensors and systems like longitudinal G sensors, temperature sensors, ADAS, and navigation systems to determine safe conditions for initiating the minimized heat generation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ABS system performs rapid pumping operations to prevent wheel lock-up, then braking safety is improved, but the EMB motor reaches heat generation limit due to continuous rapid repetitions
Solution Approach 1:
The patent applies periodic action by implementing a controlled pumping operation pattern where the motor operates in cycles of activation and deactivation. The controller manages the motor to perform braking and release operations in a rhythmic manner with optimized timing, allowing the motor to rest between cycles to dissipate heat while maintaining effective ABS functionality through repeated controlled pumping actions.
2Reliability
If the EMB motor operates continuously to maintain slip control during ABS operation, then braking performance is maintained, but the motor may seize or reach torque limit due to heat generation
Solution Approach 1:
The patent applies preliminary action by implementing a stop section between pumping operations where the motor is deliberately deactivated before it reaches critical temperature levels. The controller monitors and manages the motor operation to include intentional pause periods that prevent heat accumulation, thereby avoiding motor seizure and torque limit issues before they occur.
3Temperature
If the motor is stopped frequently to reduce heat generation, then motor temperature is reduced, but braking control responsiveness deteriorates
Solution Approach 1:
The patent applies dynamics by implementing variable timing control where the stop section duration and pumping operation frequency are dynamically adjusted based on real-time conditions such as motor temperature, vehicle speed, and braking demand. This dynamic management allows the system to optimize the balance between heat dissipation and braking responsiveness, ensuring adequate cooling while maintaining effective slip control.
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
Prevents the EMB motor from reaching a heat generation limit by reducing maximum torque and maximizing motor stop periods, thereby maintaining braking performance and safety during ABS operations on high-temperature downhill roads.
Implementation Method 1
the electro mechanical brake (EMB) motor repeats the driving for braking and releasing the motor
Data Source
AI summary
A embodiment method of attempting to minimize heat generation of a motor by lowering the heat generation of an electro mechanical brake (EMB) driving motor occurring in an anti-brake system (ABS) operation mode includes determining whether to enter the ABS operation mode in which the heat generation of the motor is to be minimized and in response to a determination to enter the ABS operation mode, initiating the ABS operation mode thereby lowering the heat generation of the EMB driving motor.