Vehicle Drive Controller Torque Vibration Damping
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Solution Overview
Problem
Conventional electrically operated vehicle drive controllers experience vibration issues due to noise disturbances in calculating inertia torque, which affects the accurate compensation of output torque and vehicle request torque, leading to inefficient torque management.
Innovation Solution
An electrically operated vehicle drive controller that includes processing means for calculating electric generator target torque, inertia correction torque, and damping torque, using an output torque changing index to correct drive motor target torque and set angular acceleration to zero, thereby compensating for torque imbalances and reducing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If angular acceleration is calculated using a filter to remove disturbance components, then vibration is reduced, but calculation delay occurs and vibration cannot be restrained
Solution Approach 1:
The patent introduces an angular acceleration estimation value as an intermediary parameter. Instead of directly using the noisy measured angular acceleration or the delayed filtered version, the system estimates the angular acceleration based on the relationship between drive motor torque and angular acceleration, using the drive motor torque (which has disturbance components removed) as a mediator to obtain an accurate yet timely angular acceleration estimation without filtering delay
Solution Approach 2:
The system uses feedback by continuously monitoring the drive motor torque and using it to estimate the angular acceleration in real-time. The estimated angular acceleration is then fed back into the inertia torque calculation to compensate for torque variations, creating a closed-loop control system that maintains accuracy without requiring delayed filtering
2Speed
If angular acceleration is presumed by means of state presumption, then calculation delay is avoided, but error occurs between presumed and actual angular acceleration due to mechanical differences
Solution Approach 1:
The patent replaces the mechanical model-based state presumption method with a physics-based calculation method. Instead of relying on a mechanical model that may not accurately represent the actual vehicle drive unit, the system uses the fundamental relationship between torque and angular acceleration (α = T/J), substituting the problematic measured angular acceleration with an estimated value derived from torque measurements, thereby maintaining calculation speed while improving accuracy
3Measurement precision
If inertia torque is calculated using measured angular acceleration, then accurate torque compensation is achieved, but disturbance components cause vibration
Solution Approach 1:
The patent extracts and removes the disturbance components from the torque calculation chain. By using the drive motor torque as a reference and removing its disturbance components, then using this cleaned torque value to estimate angular acceleration, the system extracts only the useful signal while leaving out the harmful noise components that would otherwise propagate through the inertia torque calculation and cause vibration
Data Source
AI summary
An electrically operated vehicle drive controller has an electric generator target torque calculation processing means for calculating electric generator target torque TG*; an inertia correction torque calculation processing means for calculating inertia correction torque on the basis of inertia torque TGI of an electric generator; a drive motor target torque generation processing means for generating drive motor target torque on the basis of the calculated inertia correction torque; and a damping torque correction processing means for correcting output torque on the basis of an output torque changing index which expresses a change of output torque due to the inertia correction torque.