Steering Control Torque Transition for Parking Assistance
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Solution Overview
Problem
Conventional electric steering control logic for parking assistance devices causes excessive impact on the steering wheel when driver manipulation is detected, leading to discomfort due to direct transfer of torque changes.
Innovation Solution
A driving assistance apparatus and method that includes a steering sensor to detect driver manipulation and a control unit that gradually changes the control torque value to a target torque value based on a preset slope or time, reducing the impact on the steering wheel by applying this torque variation to the electric power steering system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the control of the parking assistance device is stopped when driver manipulation is detected, then the cooperative control can be interrupted to allow driver intervention, but excessive impact occurs on the steering wheel due to abrupt change in motor current from control torque value to target torque value
Solution Approach 1:
The patent applies dynamics by making the torque variation adaptive and time-dependent. When driver manipulation is detected, the control unit dynamically adjusts the torque variation over time rather than applying an abrupt change. The torque variation is applied gradually during a transition period, allowing the steering motor current to change smoothly from the control torque value to the target torque value, thereby reducing impact on the steering wheel while still enabling driver intervention.
Solution Approach 2:
The patent changes the parameter of torque variation from a static, instantaneous value to a dynamic, time-dependent value. By introducing a transition period and applying torque variation gradually, the system changes the temporal characteristics of the torque parameter, which reduces the abruptness of motor current changes and minimizes impact on the steering wheel during driver intervention.
2Speed
If the control torque value is changed directly to the target torque value when parking assistance control is stopped, then the response to driver manipulation is immediate, but great impact occurs in the steering wheel due to excessive change in motor current
Solution Approach 1:
The patent introduces a dynamic transition period between the control torque value and target torque value. Instead of an instantaneous switch, the torque variation is applied gradually over time, creating a smooth transition that reduces motor current changes and minimizes steering wheel impact while maintaining a relatively fast response to driver manipulation.
Solution Approach 2:
The patent applies beforehand cushioning by introducing a torque variation that acts as a buffer during the transition from control torque value to target torque value. This gradual torque adjustment cushions the abrupt change in motor current, reducing impact on the steering wheel while still enabling timely response to driver manipulation.
Data Source
AI summary
Provided are a driving assistance apparatus and a steering control method thereof, which are capable of reducing impact on a steering wheel. The driving assistance apparatus includes a steering sensor that measures a steering manipulation signal based on a driver's manipulation of a steering wheel during control of a parking assistance device; and a control unit that, when the steering manipulation signal measured by the steering sensor is received, stops the control of the parking assistance device, changes a control torque value, which corresponds to a required steering angle when the control of the parking assistance device is stopped, to a target torque value based on the driver's manipulation of the steering wheel, wherein a torque variation is changed at a preset slope or for a preset time.