Electromechanical Parking Brake Release with Adaptive Command Timing
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Solution Overview
Problem
Existing electromechanical parking brake systems in vehicles release brakes using a fixed electrical command duration, which is often excessive and uncomfortable for the driver, and do not accurately account for the brake's initial state, temperature, and hydraulic pressure, leading to imprecise brake release.
Innovation Solution
A control unit with temperature and hydraulic pressure probes measures these parameters continuously, adjusting the electrical command duration based on stabilization of the electric current intensity, ensuring precise brake release by adding a safety stroke to account for the brake's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed electrical command duration is used to release the brake, then the brake release is simple to control, but the release time is excessive and uncomfortable for the driver
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed, static command duration to a dynamic, adaptive command duration that adjusts in real-time based on measured brake parameters (temperature, hydraulic pressure, electric current). The control unit continuously monitors these parameters and modifies the electrical command duration accordingly, allowing the system to optimize brake release time for each specific operating condition rather than using a predetermined fixed duration.
Solution Approach 2:
The patent implements feedback by using sensors to continuously measure brake temperature, hydraulic pressure, and electric current intensity, then feeding this information back to the control unit. The control unit processes this feedback and adjusts the electrical command duration to achieve complete brake release. This closed-loop feedback mechanism ensures the brake is fully released under varying conditions without requiring excessive fixed time.
2Device complexity
If a fixed electrical command duration is used to release the brake, then the control system is simple, but the release precision does not account for brake state, temperature, and hydraulic pressure
Solution Approach 1:
The patent implements feedback by using sensors to continuously measure brake temperature, hydraulic pressure, and electric current intensity, then feeding this information back to the control unit. The control unit processes this feedback and adjusts the electrical command duration to achieve complete brake release. This closed-loop feedback mechanism ensures the brake is fully released under varying conditions without requiring excessive fixed time.
Solution Approach 2:
The patent applies parameter changes by adjusting the electrical command duration based on variations in brake operating parameters such as temperature, hydraulic pressure, and electric current intensity. Rather than maintaining a constant command duration, the system dynamically changes the command parameters to match the actual brake state, thereby achieving precise release control across different operating conditions.
3Reliability
If the electrical command duration is extended to ensure complete brake release, then brake release reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements feedback by using sensors to continuously measure brake temperature, hydraulic pressure, and electric current intensity, then feeding this information back to the control unit. The control unit processes this feedback and adjusts the electrical command duration to achieve complete brake release. This closed-loop feedback mechanism ensures the brake is fully released under varying conditions without requiring excessive fixed time.
Solution Approach 2:
The patent applies parameter changes by adjusting the electrical command duration based on variations in brake operating parameters such as temperature, hydraulic pressure, and electric current intensity. Rather than maintaining a constant command duration, the system dynamically changes the command parameters to match the actual brake state, thereby achieving precise release control across different operating conditions.
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
This method reduces release time by approximately a third, conserves energy, and ensures safe, comfortable brake operation, allowing the brake to function effectively as both a parking and emergency brake.
Implementation Method 1
a temperature probe continuously making measurements, respectively, of a temperature present in the brake
Implementation Method 2
a hydraulic pressure probe continuously making measurements, respectively, of a temperature and a hydraulic pressure representative of a temperature and a hydraulic pressure present in the brake
Implementation Method 3
an electric motor for moving the actuator
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The releases of an electromechanical parking brake are controlled by measuring the change in the intensity (I) of the electrical current provided to the control motor, or a function derived from this intensity, and by extending the release of the brake only for a determined duration (Δt) after stabilization of this intensity, in order not to unnecessarily increase the idle travel of the brake actuator nor to extend the duration of the control. The determined duration (Δt) also depends on the temperature and on the hydraulic pressure in the brake.