Steering-Based Engine Torque Control for Driver Fatigue Reduction
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Solution Overview
Problem
The existing vehicle posture control methods fail to ensure consistent driver fatigue reduction due to differences in longitudinal acceleration generated in the driver seat, which vary based on the vehicle's mounting position and steering direction, leading to delayed acceleration and deceleration effects.
Innovation Solution
A vehicle control method that adjusts deceleration and acceleration torques based on the steering angle, vehicle-width-direction mounting position, and operation direction of the steering wheel, ensuring consistent longitudinal acceleration and improved linkage between longitudinal and lateral accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If vehicle posture control adds deceleration during turning operation, then vehicle posture stability is improved, but rising of longitudinal acceleration in driver seat becomes delayed due to differences in mounting position and turning direction
Solution Approach 1:
The control apparatus dynamically adjusts the deceleration amount based on real-time detection of steering operation direction and vehicle turning direction. When the steering operation direction and turning direction are opposite, the system increases deceleration amount to compensate for delayed longitudinal acceleration response, ensuring consistent driver feedback across different mounting positions and turning scenarios
Solution Approach 2:
The system changes the deceleration parameter (deceleration amount) based on detected steering and turning directions. By modifying this key parameter dynamically, the control apparatus compensates for the delayed rising of longitudinal acceleration in right-hand drive vehicles during left turns and in left-hand drive vehicles during right turns, thereby resolving the time delay issue while maintaining posture stability
2Ease of operation
If deceleration is added during steering operation to control vehicle posture, then manipulation stability and vehicle responsiveness are improved, but driver fatigue reduction effect cannot be secured appropriately due to delayed longitudinal acceleration
Solution Approach 1:
The control apparatus uses feedback from steering angle sensors and vehicle state sensors to detect the steering operation direction and turning direction. Based on this feedback, the system adjusts the deceleration amount in real-time to ensure that longitudinal acceleration rises promptly in the driver seat, thereby maintaining both manipulation stability and driver fatigue reduction effectiveness across all operating conditions
3Device complexity
If basic torque control is used without considering steering direction and mounting position, then control simplicity is maintained, but longitudinal acceleration becomes inconsistent leading to delayed vehicle response
Solution Approach 1:
The control apparatus performs preliminary detection of steering operation direction and vehicle turning direction before applying deceleration. By anticipating the need for adjusted deceleration based on detected conditions, the system prepares the appropriate control amount in advance, ensuring rapid longitudinal acceleration response without requiring complex real-time calculations during the actual turning maneuver
Data Source
AI summary
A vehicle control method is applied to a vehicle 1 in which a front wheel 2 is driven by an engine 4, and the method includes a basic torque setting step of setting basic torque to be generated by the engine 4, based on an operational state of the vehicle 1; a deceleration torque setting step of setting deceleration torque, based on an increase in steering angle of a steering apparatus 5 mounted on the vehicle 1; a torque generation step of controlling the engine 4 so that torque based on the basic torque and the deceleration torque is generated; and a deceleration torque changing step of changing the deceleration torque, based on a vehicle-width-direction mounting position of a steering wheel 6 and an operation direction of the steering wheel 6 when the steering angle is increased. Thus, vehicle posture control is performed in consideration of the vehicle-width-direction mounting position of the steering wheel 6 and the operation direction of the steering wheel 6, so that a driver fatigue reduction effect of the vehicle posture control can be secured appropriately.