Hybrid Vehicle Clutch Torque Compensation Control
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Solution Overview
Problem
Current transmission chains in vehicles face challenges in accurately determining the torque supplied by the clutch, leading to incorrect compensation by the second driving machine, resulting in issues such as loss of acceleration performance, poor control, and premature wear.
Innovation Solution
A control device that determines a weighted torque supplied by the clutch using observed and estimated torque information, allowing the second driving machine to accurately compensate for torque differences between the torque setpoint and actual transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second driving machine uses estimated clutch torque for compensation, then the control system can operate without additional sensors, but the torque compensation becomes inaccurate leading to loss of acceleration performance and poor control
Solution Approach 1:
The patent implements feedback by using the observed torque from the first driving machine to continuously adjust and refine the estimated clutch torque. The control device compares the observed torque with the estimated torque and uses this feedback loop to improve measurement accuracy without requiring additional sensors, thereby resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent replaces direct mechanical torque sensing with a computational estimation system that uses mathematical models and observed operational data. This substitution of mechanical measurement devices with a software-based estimation approach maintains system simplicity while improving torque measurement accuracy through the use of observed torque feedback
2Reliability
If the estimated clutch torque is used in all operating conditions, then the control algorithm remains simple, but accuracy deteriorates in extreme conditions such as hot or cold weather or with worn clutch
Solution Approach 1:
The patent applies dynamics by making the clutch torque estimation adaptive rather than static. The control device dynamically adjusts the estimation based on observed torque and operating conditions, allowing the system to automatically adapt to varying conditions such as temperature changes and clutch wear without requiring complex manual calibration or multiple fixed algorithms
Solution Approach 2:
The patent changes the parameters used in torque estimation based on observed operational data. By continuously updating the estimation using observed torque from the first driving machine, the system adjusts its parameters dynamically to maintain accuracy across different operating conditions without increasing algorithmic complexity
3Ease of operation
If the clutch operates with inaccurate torque estimation, then the system structure remains simple, but the second driving machine cannot correctly compensate torque errors resulting in premature wear and poor driving pleasure
Solution Approach 1:
The feedback mechanism allows the control device to continuously monitor observed torque and adjust compensation commands to the second driving machine accordingly. This ensures accurate torque compensation that maintains smooth vehicle operation and driving pleasure while preventing excessive clutch slip and premature wear
Solution Approach 2:
The system performs self-service by using its own operational data (observed torque from the first driving machine) to automatically correct torque estimation errors and adjust compensation without external intervention. This self-correcting capability ensures both driving pleasure and clutch longevity without requiring additional sensors or complex external control systems
Data Source
AI summary
A control device (DC) forms part of a drivetrain comprising a combustion-type first motive-power machine (MM1) coupled to a clutch (EM) also coupled to a non-combustion second motive-power machine (MM2) and also coupled to a primary shaft (AP) of ratio-change means (BV) coupled to a wheelset (T1) of a vehicle (V). This device (DC) comprises: – analysis means (MA) determining an observed clutch-engagement torque dependent on information indicative of the current operation of the first motive-power machine (MM1), – weighting means (MP) determining a weighted torque supplied by the clutch (EM) according to an estimate of a torque supplied by the clutch (EM) and of the observed clutch-engagement torque, and – control means (MC) determining a compensating torque that the second motive-power machine (MM2) needs to provide to supplement the determined weighted torque according to a demand for torque on the primary shaft (AP).