Variable Speed Parking Brake Control for Jerk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromechanical parking brake systems cause sudden deceleration and excessive wear due to fixed speed thresholds, leading to uncomfortable and unsafe braking experiences at low vehicle speeds during static braking, and lack effective control at higher speeds.
Innovation Solution
The system determines the vehicle speed upon actuation and adjusts the brake application speed accordingly, providing static braking functionality up to 60% reduction in application speed, with dynamic threshold selection based on speed and actuation time, allowing for smoother deceleration and extended brake application duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the mechanical brake unit is actuated at a high application speed for static braking, then the braking response time is reduced, but the vehicle experiences sudden deceleration and excessive wear
Solution Approach 1:
The patent applies dynamics by making the application speed variable rather than fixed. The control unit dynamically adjusts the application speed of the mechanical brake unit based on the current vehicle speed, transitioning from a static high-speed actuation to a dynamic speed-dependent actuation. This resolves the contradiction by allowing high application speed at very low vehicle speeds for quick response while reducing application speed at higher vehicle speeds to prevent sudden deceleration and improve driving comfort.
Solution Approach 2:
The patent changes the parameter of application speed from a fixed value to a variable parameter that depends on vehicle speed. By establishing a relationship where application speed is a function of vehicle speed (with different threshold values), the system optimizes braking performance across different operating conditions, preventing excessive wear and sudden deceleration while maintaining effective braking response.
2Device complexity
If a fixed speed threshold value of 3 km/h is used for static braking, then the braking control is simple, but the system cannot provide effective control at higher speeds
Solution Approach 1:
The patent segments the speed range into multiple intervals with different threshold values (e.g., first threshold at 3 km/h, second threshold at 6 km/h, third threshold at 12 km/h). This segmentation allows the system to provide appropriate braking control for different speed ranges while maintaining a relatively simple control structure. Each segment has its own threshold, enabling the system to adapt to higher speeds without requiring complex control algorithms.
Solution Approach 2:
The patent makes the speed threshold dynamic by selecting from multiple predefined threshold values based on the current vehicle speed. Instead of using a single fixed threshold of 3 km/h, the control unit dynamically selects the appropriate threshold from a set of values (3 km/h, 6 km/h, 12 km/h, etc.), enabling the system to adapt to various operating conditions while keeping the control logic relatively simple.
3Speed
If the electromechanical parking brake system is designed for dynamic braking when speed exceeds the threshold, then the braking function is immediately available, but the brake mechanism unit is subject to greater wear and tear
Solution Approach 1:
The patent applies dynamics by making the application speed variable rather than fixed. The control unit dynamically adjusts the application speed of the mechanical brake unit based on the current vehicle speed, transitioning from a static high-speed actuation to a dynamic speed-dependent actuation. This resolves the contradiction by allowing high application speed at very low vehicle speeds for quick response while reducing application speed at higher vehicle speeds to prevent sudden deceleration and improve driving comfort.
Solution Approach 2:
The patent changes the parameter of application speed from a fixed value to a variable parameter that depends on vehicle speed. By establishing a relationship where application speed is a function of vehicle speed (with different threshold values), the system optimizes braking performance across different operating conditions, preventing excessive wear and sudden deceleration while maintaining effective braking response.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a method for controlling an electromechanical parking brake system (EPB) of a vehicle, the electromechanical parking brake system (EPB) comprising at least one actuating element (BE), at least one brake mechanism unit (BME), and at least one control device (SG). In order to statically brake the vehicle, the actuating element (BE) is actuated and, depending thereon, the at least one brake mechanism unit (BME) is applied with a predetermined application speed (AV) controlled by a control and evaluation routine (SAR) run in the control device (SG). The vehicle speed (V) prevailing when the at least one actuating element (BE) is actuated is advantageously determined and the application speed (AV) of the brake mechanism unit (BME) is selected depending on the determined vehicle speed.