Shift-by-Wire Transmission Actuator Delay Control
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Solution Overview
Problem
Conventional shift by wire systems experience abrupt torque fluctuations during shifting from regenerative braking to neutral, leading to a sense of heterogeneity due to timing issues in hydraulic pressure control, potentially causing impacts and discomfort for the driver.
Innovation Solution
A shift by wire-based transmission system that employs a delay map to determine current control delay times for the actuator based on shift conditions, including target input torques, oil temperatures, and RPMs, to delay motor current control and secure preparation time for hydraulic pressure control, thereby stabilizing the shifting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the actuator is controlled immediately upon receiving a manipulation signal during regenerative braking, then the shifting response speed is improved, but abrupt torque fluctuations occur due to insufficient hydraulic pressure control preparation time
Solution Approach 1:
The system performs preliminary action by delaying the actuator current control signal for a predetermined period after receiving the manipulation signal. This delay allows the hydraulic pressure control to be prepared in advance, ensuring that the hydraulic system is ready to handle the shifting operation smoothly without causing abrupt torque fluctuations.
2Stability of the object's composition
If the actuator current control is delayed to allow hydraulic pressure control preparation, then torque stability is improved, but the shifting response time increases
Solution Approach 1:
The predetermined delay period serves as a preliminary action window during which the hydraulic pressure control system can prepare for the upcoming shifting operation. This ensures that when the actuator is finally activated, the hydraulic system is already in the correct state to execute the shift smoothly and efficiently.
Solution Approach 2:
The system changes the timing parameter of the actuator control signal by introducing a predetermined delay. This parameter modification allows the hydraulic pressure control to synchronize with the actuator operation, preventing torque fluctuations while maintaining overall shifting efficiency.
3Ease of operation
If manual manipulation of the transmission lever is allowed, then ease of operation is improved, but manipulation errors and accidents increase
Solution Approach 1:
The system replaces the conventional mechanical connection between the transmission lever and the actuator with an electronic control system. The manipulation signal is transmitted electronically through the controller, which then activates the actuator after the predetermined delay. This substitution eliminates direct mechanical coupling while maintaining operational ease and significantly improving reliability by preventing manipulation errors.
Data Source
AI summary
A shift by wire-based transmission system and a method for controlling the same, may include a transmission lever, a main controller that determines a target gear stage and a current control delay time of an actuator based on a manipulation signal received from the transmission lever and controls driving of the actuator based on the determined target gear stage and the current control delay time to determine a gear stage position in a response to the driving of the actuator, and a transmission control unit that controls a hydraulic pressure based on the gear stage position determined by the main controller.