Hybrid Vehicle Motor Torque Distribution for Vibration Damping
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Solution Overview
Problem
Conventional hybrid vehicles face inefficiencies in vibration damping when the torque command of the second motor approaches its upper limit, resulting in insufficient vibration reduction.
Innovation Solution
The hybrid vehicle employs a rotation restriction mechanism and an electronic control unit to manage torque distribution between the first and second motors, allowing for vibration damping torque to be output by either motor depending on efficiency conditions, ensuring reliable vibration reduction in double-drive mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque command of the second motor is increased to achieve sufficient vibration damping torque, then the vibration reduction performance is improved, but when the torque command approaches the upper limit torque of the second motor, the vibration damping torque cannot be sufficiently output, resulting in insufficient vibration reduction
Solution Approach 1:
The patent merges the vibration damping function into the double-drive mode control system by coordinating both the first motor and second motor. When the second motor cannot output sufficient vibration damping torque alone (near its upper limit), the system combines torque from both motors to achieve the required total vibration damping torque, ensuring reliable vibration reduction performance.
Solution Approach 2:
The patent dynamically adjusts the torque distribution between the first motor and second motor based on real-time operating conditions. The electronic control unit monitors the torque commands and upper limits of both motors, dynamically calculating the optimal torque allocation to ensure the sum of torques meets the vibration damping requirement while respecting individual motor constraints.
2Device complexity
If the second motor is used exclusively for vibration damping control, then the control system is simplified, but when the torque command is close to the upper limit torque, the vibration damping torque cannot be sufficiently output
Solution Approach 1:
The patent makes both the first motor and second motor capable of contributing to vibration damping torque output. The electronic control unit determines the torque command for each motor based on their respective capabilities and operating conditions, allowing either motor to participate in vibration damping control depending on the situation, thereby maintaining effectiveness without excessive complexity.
3Use of energy by moving object
If the torque distribution between first motor and second motor is optimized for efficiency, then energy consumption is reduced, but the ability to output sufficient vibration damping torque may be compromised
Solution Approach 1:
The electronic control unit continuously monitors the operating conditions of both motors, including their torque commands and upper limits, and adjusts the torque distribution in real-time. This feedback mechanism ensures that the torque allocation optimizes energy efficiency while maintaining the capability to output sufficient vibration damping torque when needed, by dynamically adapting to changing operating conditions.
Data Source
AI summary
In a hybrid vehicle, in double-drive mode of an electric drive mode, in which the hybrid vehicle travels by using two motors, that is, a first motor and a second motor, in a state where execution of vibration damping control with the use of the second motor is being required, when it is possible to output a total torque, which is the sum of a second distribution torque and a vibration damping torque, from the second motor to a drive shaft, the vibration damping control with the use of the second motor is executed; whereas, when it is not possible to output the total torque from the second motor to the drive shaft, vibration damping control with the use of the first motor is executed.