Dual Rear Clutch Torque Control During Vehicle Oversteer
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Solution Overview
Problem
In vehicles with dual clutches on the rear axle, accurately controlling lateral forces during oversteering situations is challenging due to unequal distribution of propulsion torque, leading to potential clutch damage and loss of control.
Innovation Solution
A method and apparatus for vehicles with dual clutches that detect oversteering situations and adjust torque distribution between the clutches to ensure equal torque capacity, preventing clutch slip and damage by overlocking the clutches when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If propulsion torque is unequally distributed to the inside rear wheel during oversteering to generate yaw torque and reduce oversteer, then vehicle stability is improved, but the inside rear wheel may spin up with the propulsion actuator causing high clutch slip and potential clutch damage
Solution Approach 1:
The clutch torque capacity is dynamically adjusted based on real-time detection of oversteering situations and propulsion torque levels. The control system modifies the torque distribution strategy from static equal distribution to dynamic adaptive distribution, allowing the system to switch between different torque allocation modes depending on vehicle state and clutch thermal conditions
Solution Approach 2:
The system changes the torque distribution parameters adaptively: during normal operation, unequal torque distribution is used for stability control; during oversteering with high propulsion torque, the system switches to equal torque distribution to prevent clutch slip. This parameter change resolves the contradiction by adjusting the torque allocation strategy based on operating conditions
2Reliability
If equal torque is distributed to both rear wheels during oversteering, then clutch slip is reduced and clutch damage is prevented, but the ability to generate yaw torque for oversteer reduction is diminished
Solution Approach 1:
The control system implements periodic monitoring and adjustment of torque distribution based on detected oversteering situations and clutch thermal states. The system alternates between unequal torque distribution (for stability) and equal torque distribution (for clutch protection) based on real-time conditions, creating a periodic adaptive control pattern that resolves the contradiction
Solution Approach 2:
The system uses feedback from oversteer detection sensors and propulsion torque sensors to continuously adjust torque distribution. When oversteer is detected combined with high propulsion torque above thresholds, the feedback loop triggers equal torque distribution to protect clutches, otherwise allowing unequal distribution for stability enhancement
3Reliability
If the clutch torque capacity is increased to handle high propulsion torque during oversteering, then clutch slip is reduced, but the complexity of the torque control system increases
Solution Approach 1:
The control system automatically detects oversteering situations and adjusts torque distribution without requiring complex manual intervention or additional hardware. The existing sensors and control unit self-manage the torque allocation based on pre-programmed logic, reducing the need for additional complex control mechanisms while maintaining clutch protection
Data Source
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AI summary
Method for a vehicle comprising two clutches connected to rear wheels of the vehicle and arranged to transmit torque to the rear wheels of the vehicle, the two clutches being connected to a propulsion actuator, the operating method comprising detecting an oversteering situation based on first data indicative of a vehicle motion state, detecting that a propulsion torque generated by the propulsion actuator is above a first threshold based on second data indicative of the propulsion torque generated by the propulsion actuator, and adjusting a torque request to the two clutches, wherein the two clutches are arranged to transmit torque to the rear wheels based on the torque request and based on the propulsion torque generated by the propulsion actuator.