Electric Vehicle ABS Control via Motor Torque Synchronization
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Solution Overview
Problem
In electric and fuel cell vehicles, the operation of Anti-lock Brake Systems (ABS) generates noise and wheel vibration due to sudden changes in braking hydraulic pressure, leading to motor torque fluctuations and inefficiencies, which affect gas mileage and braking stability.
Innovation Solution
A method and system for controlling ABS operations in electric and fuel cell vehicles by enabling an ABS operation signal when necessary, transmitting this signal to a vehicle controller, and removing motor torque to synchronize ABS operations, with a maximum standby time set based on driving state and environment, thereby reducing unnecessary ABS activation and regenerative braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ABS operates during rapid braking in electric/fuel cell vehicles, then braking stability is improved, but motor torque fluctuations and wheel vibration occur due to sudden braking hydraulic pressure changes
Solution Approach 1:
The control system performs preliminary detection of ABS operation status and motor torque state before actual ABS activation. When ABS operation is detected as necessary, the system preemptively adjusts motor torque to match the upcoming braking force change, preventing torque fluctuations and wheel vibration before they occur
Solution Approach 2:
The system continuously monitors ABS operation signals from the ABS controller and motor torque values from the motor controller, creating a closed-loop feedback system. Based on this feedback, the vehicle controller dynamically adjusts motor torque in real-time to maintain consistency with braking force requirements, eliminating harmful torque fluctuations
2Object-generated harmful factors
If motor torque is removed to synchronize with ABS operation, then shock and vibration are reduced, but gas mileage decreases due to loss of regenerative braking
Solution Approach 1:
Instead of completely removing motor torque during ABS operation, the system applies partial torque adjustment only to the extent necessary to synchronize with braking force changes. This partial action approach maintains enough motor torque to preserve regenerative braking functionality while eliminating harmful shocks and vibrations
Solution Approach 2:
The system dynamically changes the motor torque parameter based on ABS operation status and vehicle driving state. By adjusting torque parameters in real-time rather than binary on/off control, the system optimizes the balance between vibration reduction and energy recovery, improving gas mileage
3Reliability
If ABS operation signal is enabled based on slip value detection, then braking stability is maintained, but erroneous detection may occur leading to unnecessary ABS activation
Solution Approach 1:
The vehicle controller acts as an intermediary between the ABS controller and motor controller. It receives ABS operation signals, verifies them against additional criteria including motor torque state and driving conditions, and only activates motor torque adjustment when verification confirms genuine ABS operation is necessary, preventing erroneous detection
Data Source
AI summary
A method and system for controlling the operation of an Anti-lock Brake System (ABS) are provided. The system includes an ABS controller and a vehicle controller. The ABS controller enables an ABS operation signal when an ABS operation is necessary. The vehicle controller receives the enabled ABS operation signal from the ABS controller and adjusts the output of motor torque based on the received ABS operation signal. The ABS controller operates the ABS when a signal indicating that the motor torque has been removed is received from the vehicle controller.