Engine Torque Error Learn Dynamic Vehicle Test
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine torque estimation methods are not sufficiently accurate, leading to reduced shift quality in automatic transmissions during clutch-to-clutch shifts, making them sensitive to errors in torque estimation.
Innovation Solution
A method is introduced to calculate and compensate for torque errors by determining a compensation torque based on first and second torque errors, using a look-up table and adjusting the estimated engine torque to improve gear shift regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque estimation calculation is used based on engine operating conditions, then the transmission control can be implemented, but the torque estimation accuracy is insufficient leading to reduced shift quality
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing torque error compensation values in a lookup table before actual transmission operation. During clutch-to-clutch shifts, the system retrieves pre-computed compensation torques based on current engine operating conditions (RPM, manifold pressure), eliminating the need for real-time complex calculations and providing immediate accuracy correction for reliable shift quality
Solution Approach 2:
The patent changes parameters by introducing compensation torque as an additional parameter that adjusts the base torque estimation. The system calculates torque error as the difference between measured and estimated torque, then applies this error compensation through the lookup table to transform the inaccurate estimated torque into a corrected value that maintains reliability during shifts
2Adaptability or versatility
If clutch-to-clutch shift control is implemented using estimated torque, then gear ratio changes can be achieved, but the transmission becomes sensitive to torque estimation errors
Solution Approach 1:
The patent implements feedback by continuously monitoring the difference between measured torque and estimated torque, storing this torque error in a lookup table, and using it to compensate future torque estimations. This closed-loop approach allows the transmission control to adapt to estimation inaccuracies while maintaining reliable clutch-to-clutch shift quality across various operating conditions
Solution Approach 2:
The patent introduces an intermediary element - the torque error compensation lookup table - that mediates between the inaccurate torque estimation and the transmission control system. This intermediary pre-computes correction values that bridge the gap between estimated and actual torque, enabling versatile gear shifts without sensitivity to estimation errors
Data Source
AI summary
A method of regulating gear shifts of a transmission driven by an engine includes calculating a first torque error and calculating a second torque error. A compensation torque is determined based on the first torque error and the second torque error. The gear shifts are regulated based on the compensation torque.