Automatic Transmission Controller Shift Response via Pedal Speed
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Solution Overview
Problem
Automatic transmissions with turbocharged engines experience delayed acceleration and shift response due to turbo lag, as the engine torque is small at low speeds, leading to inefficient control of hydraulic pressure in conventional systems.
Innovation Solution
An automatic transmission control apparatus that uses the accelerator pedal operation speed to determine rapid acceleration states and corrects the friction element control hydraulic pressure by interpolating the accelerator pedal position signal, releasing the friction element with a calculated correction hydraulic pressure to improve shift responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the control hydraulic pressure of the clutch is determined based on the engine torque in a turbocharged engine, then the system structure remains simple, but the acceleration and shift response speed are delayed due to turbo lag at low speeds
Solution Approach 1:
The system performs preliminary action by detecting accelerator pedal operation speed in advance and proactively adjusting the control hydraulic pressure before the actual shift occurs. This anticipatory adjustment compensates for the turbo lag delay, ensuring the friction element is ready for engagement/release when needed, thereby improving shift response speed without requiring complex hardware modifications
Solution Approach 2:
The system implements feedback by continuously monitoring the accelerator pedal operation speed and using this information to dynamically adjust the control hydraulic pressure. The controller compares the actual pedal operation speed with threshold values and adjusts hydraulic pressure accordingly, creating a closed-loop control system that optimizes shift response while maintaining manageable system complexity
2Speed
If the control hydraulic pressure is increased to improve shift responsiveness during rapid acceleration, then the shift speed improves, but the friction element may release too early or fail to engage properly
Solution Approach 1:
The system applies dynamics by making the control hydraulic pressure adjustable and adaptive rather than fixed. The pressure is dynamically modified based on real-time accelerator pedal operation speed detection, allowing the system to optimize friction element engagement and release timing for each specific driving condition, thereby improving both shift speed and engagement reliability
Solution Approach 2:
The system changes parameters by adjusting the control hydraulic pressure level based on detected accelerator pedal operation speed. When rapid acceleration is detected (pedal operation speed exceeds threshold), the system modifies the hydraulic pressure parameter to delay friction element release, ensuring proper engagement timing and improving shift reliability while maintaining high shift speed
3Productivity
If the friction element is released using standard control hydraulic pressure, then the control system remains simple, but the release time is prolonged during rapid acceleration, reducing acceleration performance
Solution Approach 1:
The system performs preliminary action by detecting rapid acceleration conditions (accelerator pedal operation speed exceeding threshold) in advance and proactively adjusting the control hydraulic pressure before the friction element release is initiated. This preparatory pressure adjustment ensures faster and more efficient friction element release, reducing release time and improving acceleration performance without adding complex release mechanisms
Solution Approach 2:
The system applies preliminary anti-action by counteracting the natural delay in friction element release during rapid acceleration. When the controller detects high pedal operation speed, it applies a correction hydraulic pressure that opposes the delayed release tendency, actively preventing the time loss that would otherwise occur during rapid acceleration conditions
Data Source
AI summary
An automatic transmission control apparatus includes an engine generating power by a combustion of fuel; an automatic transmission provided with a friction element including a clutch and a brake and changing the power generated in the engine into a torque required depending on a speed by an engagement and release of the friction element to be output; an accelerator pedal position sensor detecting a position signal of the accelerator pedal; and a controller determining whether a vehicle is in a rapid acceleration state from the position signal of the accelerator pedal detected from the accelerator pedal position sensor and correcting a control hydraulic pressure of the friction element if the vehicle is the rapid acceleration state. Since the friction element control hydraulic pressure is controlled depending on the operation speed of the accelerator pedal, the shift responsiveness may be improved.