Vehicular Steering Control Phase Delay Adjustment
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Solution Overview
Problem
Conventional electric power steering apparatuses provide an unnatural feeling to drivers during high-speed running due to unsatisfactory damping of vehicle behavior when steering torque is inputted, leading to a heavy and unsteady steering experience.
Innovation Solution
A vehicular steering control apparatus that includes a torque control actuator and a steering controlling section, which increases the phase delay and gain of the actuator torque relative to the steering torque, setting the phase delay in the neighborhood of 180° to improve damping and steering characteristics during high-speed running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inertia phase compensation quantity is decreased during high-speed running to apply steady steering-wheel control, then the steering stability is improved, but the driver feels unnatural by sensing the inertia during steering operation
Solution Approach 1:
The patent changes the phase delay parameter of the actuator torque based on the frequency of steering torque input. By increasing the phase delay toward 180° as frequency increases, the system dynamically adjusts the torque characteristics to improve damping of vehicle behavior while maintaining natural steering feel across different operating conditions.
2Stability of the object's composition
If the phase delay of actuator torque is increased toward 180° as steering torque frequency increases, then the damping of vehicle behavior is improved, but the steering system complexity increases
Solution Approach 1:
The steering controlling section continuously monitors the frequency of steering torque input and dynamically adjusts the phase delay of the actuator torque in response. This feedback mechanism enables the system to automatically optimize vehicle behavior damping without requiring complex manual intervention or additional hardware components.
3Speed
If the gain of actuator torque is increased along with phase delay, then the steering response is improved, but the energy consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of both phase delay and gain parameters based on the frequency characteristics of steering torque input. The system adapts its torque output characteristics in real-time, increasing gain and phase delay only when necessary to improve steering response, rather than maintaining fixed high values that would consume excessive energy continuously.
Data Source
AI summary
A vehicular steering control apparatus is comprised of a steering system of receiving a steering torque inputted by a driver, a torque control actuator connected to the steering system to produce an actuator torque relative to the steering torque and a steering controlling section connected to the torque actuator. The steering controlling section controls the torque control actuator and increases a phase delay of the actuator torque relative to the steering torque toward a neighborhood of 180° as the frequency of the inputted steering torque increases.