ABS Pedal Simulator Valve Control for Realistic Feedback
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Solution Overview
Problem
Conventional anti-lock brake system (ABS) apparatuses fail to provide a realistic ABS pedal feeling to drivers, limiting the simulation of brake pedal reaction forces during ABS control, which can cause driver anxiety and suboptimal braking performance.
Innovation Solution
A vehicle control apparatus that includes an inputter, determiner, and controller to detect ABS operation signals, pedal stroke signals, and reaction force values from a pedal simulator, allowing the controller to adjust a simulator valve to generate and transmit a realistic ABS pedal feeling by alternating opening and closing operations based on threshold pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ABS apparatus repeatedly performs pressing and decompressing to prevent wheel locking, then braking performance is stabilized, but the ABS pedal feeling becomes unrealistic and fails to match driver expectations
Solution Approach 1:
The patent introduces a pedal simulator as an intermediary component between the driver and the brake pedal. This simulator includes a reaction force generator that actively controls the pedal reaction force to match the driver's braking intent, while a simulator valve controls fluid pressure to the simulator. The intermediary device decouples the direct mechanical connection, allowing independent control of pedal feeling from actual brake pressure, thus resolving the contradiction between stable braking performance and realistic pedal feedback.
Solution Approach 2:
The system employs feedback control by detecting the driver's braking intent through operation signals and pedal stroke signals, comparing this with the actual pedal reaction force, and adjusting the simulator valve accordingly. The controller continuously monitors the braking state and modifies the reaction force generated by the pedal simulator to maintain alignment with driver expectations, creating a closed-loop feedback system that resolves the pedal feeling issue while maintaining braking stability.
2Reliability
If ABS control is activated according to driver braking will, then wheel locking is prevented, but driver anxiety increases due to unrealistic pedal feedback
Solution Approach 1:
The pedal simulator acts as a mediator that buffers the direct mechanical feedback from the ABS system to the driver. When ABS control activates, the simulator valve adjusts fluid pressure to the reaction force generator, maintaining a realistic pedal reaction force that matches driver intent. This intermediary control prevents the harsh, unrealistic feedback that would otherwise occur during ABS activation, thereby reducing driver anxiety while maintaining wheel locking prevention functionality.
Solution Approach 2:
The system prepares for potential ABS activation by continuously monitoring braking parameters and pre-adjusting the pedal simulator settings. Before ABS control fully engages, the simulator begins adjusting the reaction force to anticipate the upcoming pressure changes, cushioning the transition and preventing sudden, jarring feedback to the driver. This beforehand cushioning reduces the shock and anxiety associated with ABS activation while maintaining effective wheel locking prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a realistic ABS pedal feeling that aligns with the driver's braking intentions, reducing anxiety and enhancing the overall braking experience by accurately simulating the desired pedal reaction forces during ABS control.
Implementation Method 1
a simulator valve to generate an ABS pedal feeling corresponding to a current value of a reaction force of the pedal simulator changed by alternate opening and closing operations of the simulator valve and transmit the ABS pedal feeling to a pedal
Data Source
AI summary
Disclosed herein is a vehicle control apparatus and a control method thereof. The vehicle control apparatus and the control method thereof includes: an inputter configured to receive an operation signal of an anti-lock brake system (ABS) and an operation signal of a pedal stroke which are detected by a detector, and a current value of a reaction force of a pedal simulator; a determiner configured to determine whether or not the input operation signal of the ABS is in an ABS control started state according to a driver's braking will, whether or not the input operation signal of the pedal stroke is in a pedal travel increasing state, and whether or not the input current value of the reaction force of the pedal simulator is a target pressure value needed to generate an ABS pedal feeling; and a controller configured to control a simulator valve to generate an ABS pedal feeling corresponding to a current value of a reaction force of the pedal simulator changed by alternate opening and closing operations of the simulator valve and transmit the ABS pedal feeling to a pedal when the input operation signal of an ABS is in the ABS control started state, the input operation signal of the pedal stroke is in the pedal travel increasing state, and the input current value of the reaction force of the pedal simulator is the target pressure value.