Vehicle Torque Change Control Based on Shock Tolerance
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Solution Overview
Problem
Existing vehicle systems experience uncomfortable shocks during rapid torque changes for driving wheels, which can be mitigated by optimizing torque change times.
Innovation Solution
A control device that adjusts torque change times based on shock tolerance to minimize occupant discomfort by integrating processing circuitry for determining and adhering to shock tolerance levels during mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If torque is sharply changed to reduce torque change time, then productivity is improved, but uncomfortable feeling of occupant increases due to shock generation
Solution Approach 1:
The patent applies dynamics by making the torque change time variable rather than fixed. The control device dynamically adjusts the torque change time based on real-time shock tolerance information, which varies according to vehicle operating conditions such as vehicle speed, acceleration, and driver operations. This allows the system to optimize torque change speed adaptively - using shorter change times when shock tolerance is high and longer change times when shock tolerance is low, thereby resolving the contradiction between fast torque response and shock suppression.
Solution Approach 2:
The patent changes the parameter of torque change time based on shock tolerance levels. By monitoring vehicle state parameters (speed, acceleration, driver input) and determining corresponding shock tolerance, the system adjusts the torque change time parameter dynamically. This parameter change strategy enables the torque change process to adapt to different operating conditions, achieving both rapid torque response when appropriate and shock mitigation when necessary.
2Object-affected harmful factors
If torque change time is extended to suppress shock, then uncomfortable feeling of occupant is reduced, but productivity deteriorates due to increased torque change time
Solution Approach 1:
The system dynamically determines shock tolerance based on real-time vehicle operating conditions including vehicle speed, acceleration, and driver operations. This dynamic assessment allows the control device to adjust torque change time appropriately for each situation, preventing unnecessary extension of torque change time that would reduce productivity. The dynamic approach ensures torque change time is extended only when actually needed for shock suppression.
Solution Approach 2:
The patent changes the torque change time parameter based on determined shock tolerance levels. When shock tolerance is high, the system uses shorter torque change times to maintain productivity. When shock tolerance is low, the system extends torque change time to suppress shock. This conditional parameter change resolves the contradiction by making torque change time adaptive rather than uniformly long or short.
Data Source
AI summary
A control device of a vehicle according to one aspect is a control device of a vehicle, the vehicle including at least one traveling driving source that generates torque for driving a driving wheel, the control device including processing circuitry configured to execute torque change control in which when the processing circuitry acquires a torque change request by which transmitted torque transmitted from the traveling driving source to the driving wheel is changed from first required torque to second required torque, the processing circuitry changes the transmitted torque from the first required torque to the second required torque. When the processing circuitry acquires the torque change request, the processing circuitry determines a shock tolerance indicating a tolerance with respect to shock generated at a vehicle body of the vehicle. The processing circuitry executes the torque change control such that a torque change time that is a time required to change the transmitted torque from the first required torque to the second required torque is changed in accordance with the determined shock tolerance.