Electric Motor Torque Control for eAxle Vibration Cancellation
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Solution Overview
Problem
Electric vehicles experience higher shake and vibration due to the involvement of the electric powertrain in vibrational modes, particularly in eAxle suspensions, leading to reduced driving comfort without additional suspension components.
Innovation Solution
A vehicle control system employing electric motor torque and speed control to generate a cancellation signal that modulates drive torque to counteract vibrational modes, such as pitch vibration, by determining vehicle status and operational intent through a sensor network and controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric powertrain is used in eAxle suspension, then vehicle propulsion capability is improved, but vibration amplitude increases
Solution Approach 1:
The patent converts the harmful vibration generated by the electric powertrain into a beneficial control signal. The controller detects the vibration characteristics (frequency, amplitude) and generates a counter-vibration torque command that is injected into the motor control system, transforming the harmful vibration into a controlled parameter that can be actively managed and eliminated.
Solution Approach 2:
The patent implements a feedback control loop where sensors detect the actual vibration state of the vehicle body and axle, the controller processes this information to determine the vibration characteristics, and the torque control module adjusts the motor output in real-time based on the generated cancellation signal, creating a closed-loop system that continuously reduces vibration.
2Object-affected harmful factors
If additional suspension components are added to reduce vibration, then vibration amplitude is reduced, but device complexity increases
Solution Approach 1:
The patent replaces mechanical vibration reduction components (such as additional dampers, springs, or passive isolation elements) with an electronic control system. The electric motor's torque control capability is used to generate active counter-vibrations, substituting complex mechanical additions with a more compact electronic control approach that uses the existing powertrain components.
Solution Approach 2:
The patent makes the electric motor serve multiple functions: it provides the primary propulsion function while simultaneously acting as an active vibration cancellation actuator. The same motor that drives the vehicle also generates the counter-vibration torque, eliminating the need for dedicated vibration reduction components and reducing overall system complexity.
3Object-affected harmful factors
If electric motor torque modulation is used to cancel vibration, then driving comfort is improved, but control complexity increases
Solution Approach 1:
The patent merges the vibration cancellation control logic with the existing motor control system. The torque cancellation command is integrated into the motor's torque control algorithm, combining the propulsion control and vibration cancellation control into a unified control framework that shares sensors, processors, and actuation pathways, thereby managing control complexity through integration rather than separation.
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
This approach effectively reduces vehicle vibrations without adding extra suspension components, enhancing driving comfort by canceling unwanted vibrations through real-time torque modulation.
Implementation Method 1
an electric motor to generate a drive torque for propulsion of the vehicle
Implementation Method 2
The torque control module torque may modulate the drive torque based on the cancellation signal to cancel the force application reference axis vibration
Data Source
AI summary
A vehicle control system for a vehicle may include an electric motor to generate a drive torque for propulsion of the vehicle, a sensor network operably coupled to suspension or propulsion system components of the vehicle to determine information indicative of vehicle status, a torque control module configured to generate the drive torque based at least in part on information indicative of operational intent, and a controller operably coupled to the sensor network to determine force application reference axis vibration based on the information indicative of vehicle status to generate a cancellation signal for provision to the torque control module. The torque control module torque may modulate the drive torque based on the cancellation signal to cancel the force application reference axis vibration.