EPB Control Logic for Inclination Uncertainty
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Solution Overview
Problem
Conventional electronic parking brake (EPB) systems face limitations in determining inclination, leading to inconsistent braking forces and inefficient transition from stopping to traveling modes, causing driver anxiety and reduced traveling efficiency.
Innovation Solution
A vehicle control apparatus and method that determines the vehicle's state using wheel speed and acceleration values to switch to an inclination determination impossible mode, lowering the braking force to a target value and releasing it at a set time, thereby improving efficiency and reducing driver anxiety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EPB apparatus generates maximum braking force when inclination determination is impossible, then safety is ensured, but traveling efficiency deteriorates due to prolonged braking force release time
Solution Approach 1:
The system changes the braking force parameter dynamically based on detected conditions. When immediate stopping is detected (wheel speed below threshold and engagement signal received), the system switches from normal inclination-based braking force to a reduced braking force parameter, enabling faster release while maintaining safety for urgent stops
Solution Approach 2:
The braking force is made dynamic rather than static. The system continuously monitors wheel speed and engagement signals to adjust the braking force level in real-time, transitioning between different braking force states based on whether immediate stopping is required or not
2Measurement precision
If the conventional EPB apparatus uses acceleration sensor for inclination determination, then inclination can be detected, but determination accuracy deteriorates when engagement signal is generated immediately before stopping due to acceleration value fluctuation
Solution Approach 1:
The system introduces wheel speed as an intermediary indicator to infer immediate stopping conditions. Instead of relying solely on the acceleration sensor which fluctuates during engagement, the wheel speed serves as a more stable mediator to determine whether immediate stopping is occurring, enabling more reliable condition assessment
Data Source
AI summary
A vehicle control apparatus includes an input portion configured to receive an engagement operation signal; a determiner configured to determine whether the engagement operation signal is generated before a vehicle is stopped and whether a current state is a first state; when the current state is the first state, determine whether the current state is a second state in which the vehicle is intended to be stopped on flat land; and, when the current state is the second state, determine that the current state is a third state in which it is impossible for the EPB apparatus to determine an inclination; and a controller configured to turn off an inclination determining mode and turn on an inclination determination impossible mode of the EPB apparatus when the current state is determined as the first state, the second state, and the third state.