Transmission Valve Control Using Acceleration Compensation
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Solution Overview
Problem
Existing automatic transmission systems experience suboptimal shift performance during high acceleration maneuvers due to inertial effects on the regulating valve, leading to transient issues like turbine flare or tie-up, which are not effectively addressed by current methods.
Innovation Solution
A vehicle transmission system that uses accelerometer readings and calculated acceleration levels to compensate for inertial effects on the regulating valve by adjusting clutch pressure through a controller, which calculates and applies an offset pressure to minimize these transient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clutch pressure calculation methods are used during high acceleration maneuvers, then the transmission control system operates with simple calibration-based pressure commands, but inertial effects on the regulating valve cause transient turbine flare or tie-up, degrading shift quality
Solution Approach 1:
The system applies preliminary counteracting pressure adjustments to the regulating valve based on predicted inertial effects from acceleration. The controller calculates expected inertial forces and pre-compensates the clutch pressure command to counteract the harmful inertial effects before they manifest as turbine flare or tie-up, thereby maintaining shift quality during high acceleration maneuvers
Solution Approach 2:
The system uses accelerometer feedback to continuously monitor vehicle acceleration and feeds this information back to the controller. The controller uses this feedback to dynamically adjust the clutch pressure command, compensating for inertial effects on the regulating valve in real-time. This closed-loop feedback mechanism enables the system to adapt to changing acceleration conditions and maintain reliable shift performance
2Reliability
If acceleration compensation is implemented using accelerometers and dynamic pressure calculation, then transient turbine flare and tie-up are minimized, but the control system complexity increases
Solution Approach 1:
The system introduces an intermediary acceleration compensation module that sits between the traditional pressure calculation and the PCS control. This module receives accelerometer data, calculates inertial effects, and generates compensation terms that are added to the base pressure command. By creating this intermediary layer, the system adds acceleration compensation functionality without fundamentally redesigning the entire control architecture, thus managing complexity while improving performance
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
The solution effectively reduces instances of turbine flare and tie-up during transmission shifts by accurately accounting for acceleration forces, thereby improving shift quality and driver experience, especially in high-performance vehicles.
Implementation Method 1
a pressure control solenoid (PCS) valve device... controlled via a PCS
Implementation Method 2
pressure commands to the clutch during a shift of the transmission may be affected at times by vehicle acceleration... due to the mass of the regulating valve
Data Source
AI summary
A vehicle includes an engine, a transmission, and a controller. The transmission includes a pressure control solenoid (PCS) valve device having a PCS and a regulating valve, a friction clutch, and a clutch piston in fluid communication with the regulating valve. The piston is operable to apply a clutch pressure to the friction clutch during a shift of the transmission. The controller is programmed to receive an acceleration value describing a lateral and/or longitudinal acceleration force of the vehicle, calculate the clutch pressure using the received acceleration value, and control an operation of the regulating valve via the PCS using the calculated clutch pressure. The acceleration value may be determined via one or more accelerometers or calculated. A method is also disclosed for compensating for acceleration in control of the regulating valve in a vehicle having a transmission that includes a friction clutch, PCS, and regulating valve.