Torque Command Generation for Hybrid Electric Vehicle HSG Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid electric vehicles face performance issues due to torque loss and excess amounts caused by threshold increase and decrease rates, leading to potential damage to torque sources like the HSG, limiting their efficiency and fuel efficiency.
Innovation Solution
A method and apparatus for generating torque commands that correct torque loss and excess amounts by setting threshold rates and adjusting torque commands based on performance limits, using virtual triangles and quadrangles to calculate and adjust torque levels within allowable limits, ensuring superior torque source performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threshold increase rate and threshold decrease rate are applied to HSG torque command to prevent belt damage, then reliability of torque source is improved, but productivity and performance of HSG are deteriorated due to torque loss amount and torque excess amount
Solution Approach 1:
The controller predicts future torque commands based on current acceleration and jerk rates before they are applied. By calculating predicted torque values in advance and comparing them with threshold limits, the system can proactively adjust the torque command to prevent excessive torque changes that would damage the belt, while still maintaining optimal HSG performance.
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors the torque command, calculates acceleration and jerk rates, predicts future torque values, and compares them with threshold limits. Based on this feedback loop, the controller dynamically adjusts the torque command to stay within safe operational limits while minimizing torque loss and excess amounts, thereby resolving the contradiction between reliability and productivity.
2Speed
If torque command is rapidly increased or decreased, then response speed of HSG is improved, but torque source may be damaged due to exceeding threshold rates
Solution Approach 1:
The controller performs preliminary calculations of predicted torque commands based on current acceleration and jerk rates before the torque changes are executed. By predicting future torque values and comparing them with threshold limits in advance, the system can identify potentially damaging torque changes before they occur and adjust the command accordingly, preventing belt damage while maintaining rapid response capability.
Solution Approach 2:
The system uses feedback to continuously monitor torque command rates and predict future values. When predicted torque changes approach threshold limits, the feedback mechanism triggers corrective actions to reduce the rate of change, preventing torque source damage while minimizing the impact on response speed.
3Reliability
If torque command is limited by threshold increase rate and threshold decrease rate, then torque source is protected from damage, but torque loss amount and torque excess amount are generated
Solution Approach 1:
The controller predicts future torque commands before they are applied by calculating based on current acceleration and jerk rates. This preliminary prediction allows the system to identify when torque commands would exceed threshold limits and adjust them in advance, minimizing the torque loss and excess amounts that occur when thresholds are enforced reactively.
Solution Approach 2:
The feedback mechanism continuously compares predicted torque commands with threshold limits and dynamically adjusts the torque command to stay within safe operational ranges. This proactive adjustment minimizes the magnitude of torque corrections needed, thereby reducing torque loss and excess amounts while still protecting the torque source from damage.
Data Source
AI summary
A method for generating torque commands includes: setting a threshold increase rate and a threshold decrease rate of an initial torque command according to performance of a torque source; comparing an increase rate of the initial torque command with the threshold increase rate, while generating a final torque command based on the initial torque command; determining a first time at which the increase rate of the initial torque command reaches the threshold increase rate, and generating the final torque command which increases according to the threshold increase rate after the first time, when the increase rate of the initial torque command is greater than the threshold increase rate; determining a second time at which the final torque command reaches the initial torque command, and calculating a torque loss amount between the first time and the second time, when the final torque command reaches the initial torque command after the first time; and generating the final torque command for correcting the torque loss amount after the second time.