Motor Control Unit for Fast EV Wheel Slip Braking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric vehicles experience wheel slip on low-adhesion roads, leading to reduced power and instability, with existing braking methods causing delays and potential yawing due to delayed suppression of wheel slip.
Innovation Solution
A motor control unit directly controls wheel end brake apparatuses based on resolver signals to quickly suppress wheel slip, adjusting braking force and torque distribution among wheels to stabilize the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wheel braking is used to limit wheel slip, then wheel slip can be suppressed, but braking delay is high causing the wheel to slip before braking takes effect
Solution Approach 1:
The patent segments the control function by separating wheel slip detection and braking control into independent modules. The motor control unit detects wheel slip independently and triggers braking control without waiting for the vehicle control unit, dividing the control path into parallel independent channels that reduce overall response delay
Solution Approach 2:
The motor control unit performs preliminary action by detecting wheel slip conditions and initiating braking control in advance, before the vehicle control unit would normally process the signal. This preliminary detection and control activation reduces the time gap between slip occurrence and braking intervention
2Ease of operation
If vehicle control unit participates in signal transfer for wheel slip control, then centralized control is achieved, but slipping suppression delay increases
Solution Approach 1:
The control system is segmented into independent functional modules where the motor control unit handles detection and braking control separately from the vehicle control unit. This segmentation allows the motor control unit to act independently without waiting for vehicle control unit signal processing, reducing delay while maintaining overall system coordination
Solution Approach 2:
The motor control unit acts as an intermediary that directly receives wheel slip detection signals and triggers braking control without requiring vehicle control unit intervention. This intermediary role eliminates the signal transfer delay through the vehicle control unit while maintaining systematic control architecture
Data Source
AI summary
A motor control unit, a powertrain, and an anti-slip control method for an electric vehicle are described. The motor control unit is configured to control one drive motor to drive an electric vehicle and control a plurality of wheel end brake apparatuses of the electric vehicle, and the plurality of wheel end brake apparatuses are respectively configured to brake a plurality of wheels of the electric vehicle. The motor control unit is further configured to: in a process of controlling the one drive motor to drive the electric vehicle, in response to slipping of one wheel in the plurality of wheels, control one wheel end brake apparatus corresponding to the one wheel to brake the one wheel. Based on this, when one wheel of the electric vehicle slips, the motor control unit can perform control, so as to suppress the slipping of the wheel more quickly.