Vehicle Throttle Control for Twin-Clutch Gear Shift Shock Reduction
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Solution Overview
Problem
Twin-clutch type vehicles experience shocks during gear changes due to blipping operations, where drivers unintentionally adjust the accelerator, causing torque imbalances between the engine and transmission, leading to unstable driving states.
Innovation Solution
A vehicle control apparatus that includes a target value determination unit and a change suppression unit to manage the output torque and throttle valve opening degree, reducing the rate of change during gear shifts to maintain a balance between engine torque and load torque, thereby preventing shocks and ensuring smooth transitions post-gear change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the throttle valve opening degree is prevented from following accelerator operation during gear change, then shocks due to blipping operations are prevented, but the throttle valve opening degree is delayed in following accelerator operation after gear change ends
Solution Approach 1:
The control system dynamically adjusts the throttle valve opening degree based on real-time detection of driving/driven states and gear change status. The control parameters change according to operating conditions, allowing the system to prevent shocks during gear changes while maintaining swift response after gear changes complete.
Solution Approach 2:
The system continuously monitors the driving/driven state through torque comparisons and accelerator operation detection, using this feedback to determine whether to restrict or allow throttle valve response. This feedback mechanism enables the system to adaptively control throttle behavior, preventing shocks when needed while ensuring rapid response when safe to do so.
2Speed
If the output torque is changed rapidly during gear change, then the gear change response is swift, but the change from driving state to driven state causes shocks
Solution Approach 1:
The system applies preliminary anti-action by detecting when the output torque approaches the load torque boundary during gear changes and proactively restricting further torque changes that would cause state transitions. This preventive measure stops shocks before they occur by anticipating the problematic state change.
Solution Approach 2:
The control system dynamically adjusts the rate of output torque change based on real-time conditions. During gear changes, the system modulates torque change speed to maintain stability, allowing swift gear changes when conditions permit while preventing shocks when approaching critical torque boundaries.
Data Source
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AI summary
A vehicle control apparatus includes an opening degree determination unit that determines the opening degree of a throttle valve based on an accelerator operation amount, and a change suppression unit that reduces a time rate of changing of the opening degree of the throttle valve in a gear change period with a decrease of the rotation speed of the engine, when the opening degree of the throttle valve is changed from a value at which an output torque is greater than a load torque input from a transmission path to an engine toward a boundary value where the output torque is equal to the load torque.