Hybrid Torque Intervention Controller for NVH and SOC Management
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Solution Overview
Problem
Hybrid electric vehicles face challenges in torque intervention control, leading to battery state of charge depletion and noise, vibration, and harshness (NVH) performance issues due to conventional methods that either prioritize engine or motor torque reduction without considering the motor state and available reduction ranges.
Innovation Solution
A system and method that divide torque reduction requests between the engine and motor based on the motor's state and available reduction ranges, where the controller reduces motor assist torque in assist states and maintains motor charging torque in charging states, proportionally distributing additional reduction requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor torque is reduced first to preserve battery SOC, then battery state of charge is maintained, but NVH performance deteriorates due to excessive engine noise
Solution Approach 1:
The controller dynamically changes the torque reduction parameters based on motor state. When motor torque is reduced first, the engine torque is simultaneously adjusted to compensate, changing the torque distribution parameters to maintain NVH performance while preserving battery SOC
Solution Approach 2:
The system dynamically adjusts torque distribution between engine and motor based on real-time motor state and driving conditions. The controller switches between different torque reduction strategies (motor-first vs. engine-first) depending on the situation, making the system adaptive rather than static
2Object-affected harmful factors
If engine torque is reduced first to improve NVH performance, then engine noise is reduced, but battery SOC depletes due to increased motor torque requirements
Solution Approach 1:
The controller changes torque distribution parameters dynamically. When engine torque is reduced for NVH improvement, the motor torque is increased to compensate, and the battery charging/discharging parameters are adjusted accordingly to maintain SOC within acceptable ranges
Solution Approach 2:
The system dynamically switches between torque reduction strategies based on battery SOC levels and driving conditions. When SOC is high, engine torque can be reduced more aggressively; when SOC is low, motor torque is reduced first to preserve battery charge
3Reliability
If motor torque is continuously reduced to preserve battery SOC, then battery state of charge is maintained, but motor power performance deteriorates
Solution Approach 1:
The controller applies partial torque reduction to the motor only when necessary and appropriate, rather than continuous full reduction. The motor torque is reduced partially to preserve SOC while maintaining sufficient power performance for driving requirements
Solution Approach 2:
The system dynamically adjusts motor torque reduction levels based on driving conditions, battery SOC, and power demands. During high-power需求的 situations, motor torque is maintained or reduced minimally; during low-demand situations, motor torque is reduced more to preserve SOC
Data Source
AI summary
A system and a method for controlling torque intervention of a hybrid electric vehicle including a motor and an engine as power sources that includes: a driving information detector detecting a running state of the vehicle and demand information of a driver of the vehicle; a transmission control unit (TCU) requesting torque reduction while shifting of the vehicle based on a signal from the driving information detector; a traction control system (TCS) requesting torque reduction by outputting an intervention torque for preventing a wheel slip of the vehicle; and a controller controlling torque intervention by dividing a request amount of torque reduction into the engine and the motor when receiving the torque reduction request from the TCU or the TCS, wherein the controller firstly reduces a motor assist torque when a state of the motor before the torque intervention is an assist state, maintains a motor charging torque when the state of the motor before torque intervention is a charging state, and divides an additional reduction requirement in proportion to an available reduction range of the engine and an available reduction range of the motor.