Vehicle Braking Force Control for Stationary Steering Noise
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Solution Overview
Problem
Existing braking force control systems for vehicles experience delays in mitigating braking forces during stationary steering, leading to abnormal noise and swing, increased steering load, and stress accumulation in tires and suspension devices due to the delay in detecting steering operations.
Innovation Solution
A braking force control system that includes a pre-detection unit to anticipate stationary steering and a stop braking force control unit that reduces the braking force of steered wheels before the steering operation begins, thereby minimizing stress accumulation and load on the steering device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If braking force mitigation control is started after detection of stationary steering, then control accuracy is improved, but response time deteriorates causing abnormal noise and swing
Solution Approach 1:
The system performs preliminary action by starting braking force mitigation control before the stationary steering operation is fully detected. The control starts when the vehicle stop condition is met, anticipating the steering operation that will occur shortly after, thereby eliminating the delay between detection and control activation.
Solution Approach 2:
The system applies preliminary anti-action by proactively reducing braking force before the stress accumulation that causes abnormal noise and swing can occur. By anticipating the stationary steering operation and reducing braking force in advance, the system prevents the harmful effects rather than reacting to them after detection.
2Reliability
If detection margin is increased to prevent erroneous detection, then reliability is improved, but response time deteriorates due to longer detection delay
Solution Approach 1:
The system uses preliminary action by establishing a separate vehicle stop condition with appropriate detection margin that triggers control in advance. This allows the system to maintain reliability through proper margin settings while accepting earlier control activation, as the preliminary stop condition detection is designed to be sufficiently accurate for its purpose.
3Force
If braking force is not loosened during stationary steering, then braking effectiveness is improved, but stress accumulation increases causing abnormal noise and swing
Solution Approach 1:
The system applies preliminary action by reducing braking force on steered wheels before the stationary steering operation begins. This preventive reduction of braking force prevents stress accumulation in the tire and suspension components that would otherwise occur during the steering operation, thereby eliminating abnormal noise and swing.
Solution Approach 2:
The system applies local quality by selectively reducing braking force only on steered wheels while maintaining braking force on non-steered wheels. This localized differentiation allows the system to prevent stress accumulation and abnormal noise during stationary steering of steered wheels while preserving overall braking effectiveness through the non-steered wheels.
Data Source
AI summary
The present invention prevents occurrence of abnormal noise and swing of a vehicle in mitigating braking force of a steered wheel while reducing a steering load at the time of stationary steering to reduce a burden of a steering device and reducing stress accumulation due to stationary steering to reduce burdens of a tire, a suspension device and the steering device. The present invention includes a stop braking force control unit 202 that individually controls braking forces of steered wheels 51 and 52 and non-steered wheels 53 and 54 at the time of deceleration of the vehicle, and a pre-detection unit 203 that detects steering in a stopped state of the vehicle in advance, in which the stop braking force control unit executes, when the steering in a stopped state of the vehicle is detected in advance by the pre-detection unit, braking force mitigation control to decrease the braking forces of the steered wheels to be lower than the braking forces at the time of normal braking.