Vehicle Steering Control via EPS and EPB Merging
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Solution Overview
Problem
Existing vehicle steering systems struggle to achieve effective control when turning on curves with small radii, resulting in poor maneuverability and turning conditions.
Innovation Solution
A vehicle steering control method and system that utilizes Electric Power Steering (EPS) and Electrical Park Brake (EPB) for cornering, with closed-loop control between the electric control booster, EPB, and EPS to optimize cornering radius and assist in single-side parking, ensuring the vehicle turns under the optimal cornering condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the vehicle reduces speed and turns the steering wheel to maximum extent, then the cornering radius is minimized, but the steering control effect deteriorates on curves with smaller radius
Solution Approach 1:
The patent combines EPS (electric power steering) and EPB (electronic parking brake) systems into a unified cornering control system. The EPS controls the steering wheel angle while the EPB applies differential braking force to the rear wheels, creating a synergistic effect that improves both cornering radius and steering control reliability simultaneously
Solution Approach 2:
The control system introduces an intermediate control mechanism that coordinates between the steering system and braking system. The controller acts as an intermediary, processing cornering detection signals and coordinating the activation timing and force distribution between EPS and EPB to achieve optimal cornering performance
2Speed
If EPS controls steering for cornering, then the steering response is improved, but the cornering radius cannot be sufficiently reduced on tight curves
Solution Approach 1:
The patent merges the steering function (EPS) with the braking function (EPB) to create a combined cornering assistance system. The EPS provides rapid steering response while the EPB simultaneously applies differential braking to reduce the effective cornering radius, achieving both fast response and tight turning capability
3Device complexity
If the vehicle uses traditional steering system, then the system complexity is low, but the maneuverability on tight curves is insufficient
Solution Approach 1:
The patent makes the existing EPB system serve multiple functions: its primary function of parking brake is supplemented with a secondary function of cornering assistance. By controlling the EPB to apply differential braking during cornering maneuvers, the system achieves enhanced maneuverability without adding dedicated cornering hardware
Solution Approach 2:
The patent combines the traditional steering system with the electronic parking brake system into an integrated cornering control system. This merging allows the vehicle to maintain simple system architecture while achieving improved maneuverability through coordinated control of steering and braking functions
Data Source
AI summary
A vehicle steering control method, device and system, and a vehicle are provided. The vehicle steering control method includes: in a case where a current vehicle speed is less than a turning vehicle speed threshold, steering of a vehicle is controlled by an Electric Power Steering (EPS) to implement cornering of the vehicle; in a case where a cornering condition of the vehicle is not reached during the cornering of the vehicle, the vehicle is controlled by an Electrical Park Brake (EPB) to perform single-side parking to assist in the cornering of the vehicle; and after the single-side parking of the vehicle is implemented, closed-loop control is performed on an electric control booster, the EPB and the EPS, and the vehicle is controlled to turn under the cornering condition.