Automatic Transmission TCU Dynamic Coefficient Compensation
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Solution Overview
Problem
Automatic transmissions face adverse impacts during gear shifting due to hardware deviations in individual parts, such as solenoid discharge rate variations and differing oil charge times, when collective control is performed without accounting for dynamic characteristics.
Innovation Solution
A control apparatus and method that includes an electric hydraulic pump, an actuator for controlling friction elements, and a transmission control unit (TCU) that corrects control signals based on dynamic characteristic coefficients stored in map tables, adjusting control duty and fill time to account for hardware deviations and shift types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If collective control is performed in TCU without accounting for dynamic characteristics of automatic transmission single parts, then control simplicity is maintained, but adverse impacts are generated during gear shifting operation
Solution Approach 1:
The patent applies local quality by creating individual dynamic characteristic coefficients for each single part (solenoid, clutch) rather than using a uniform collective control approach. Each part's specific characteristics (discharge rate, charge time) are measured and stored separately, allowing the TCU to apply tailored control parameters to each component, thereby resolving the contradiction between control simplicity and gear shifting reliability.
Solution Approach 2:
The patent implements preliminary action by pre-measuring and storing dynamic characteristic coefficients for each single part during the assembly process. This advance preparation allows the TCU to retrieve and apply appropriate compensation values during gear shifting operations without real-time measurement, maintaining control simplicity while improving reliability through personalized control parameters.
2Reliability
If dynamic characteristic coefficients are measured and stored for each single part, then gear shifting performance is improved, but measurement and control complexity increases
Solution Approach 1:
The patent reduces control complexity by performing all measurements during the assembly process and storing results in advance. The TCU simply retrieves pre-determined dynamic characteristic coefficients during operation without needing complex real-time measurement systems, thus improving gear shifting performance while avoiding excessive control system complexity.
Solution Approach 2:
The patent uses copying by creating a digital representation (dynamic characteristic coefficient) of each physical part's behavior. Instead of complex real-time sensing and measurement, the system uses these copied characteristics to predict and compensate for part variations, simplifying the control system while maintaining high gear shifting performance.
3Device complexity
If solenoid discharge rate and clutch charge time variations are not compensated, then control system remains simple, but shift feel deteriorates
Solution Approach 1:
The patent addresses shift feel by applying local quality compensation specifically to solenoid discharge rates and clutch charge times. Individual coefficients are measured and stored for each solenoid and clutch, allowing the TCU to adjust control parameters (control duty, fill time) to compensate for part variations, thereby improving shift feel without requiring a completely complex control system redesign.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves shift feel by accurately compensating for hardware deviations in automatic transmission single parts, enhancing gear shifting performance.
Implementation Method 1
an electric hydraulic pump including a motor and a pump; an actuator for engaging or releasing a friction element by controlling a hydraulic pressure discharged from the pump
Data Source
AI summary
A control apparatus of an automatic transmission includes an electric hydraulic pump including a motor and a pump, an actuator for engaging or releasing a friction element by controlling a hydraulic pressure discharged from the pump, and a transmission control unit (TCU) for correcting a control signal to control the actuator depending on a dynamic characteristic coefficient of the friction element and the actuator during shifting when outputting the control signal to the actuator.