Electric Parking Brake Thrust Control Without Idling Current
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Solution Overview
Problem
Existing electric brake systems face challenges in accurately controlling pressing thrust due to individual differences and varying use situations, leading to insufficient or excessive braking forces, and require complex computations that increase storage capacity and computational load.
Innovation Solution
An electric-parking-brake control device and method that computes a motor stop current based on current and voltage variations, selecting optimal prospective values to determine characteristic parameters for precise thrust control, regardless of idling phases or individual motor variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional method measures current and voltage values from the current variation phase to the idling phase to compute the motor constant, then the computation of pressing thrust can be performed, but the storage capacity increases, computation load increases, and computation accuracy is poor when no idling phase exists
Solution Approach 1:
The invention extracts only the essential data needed for computation (current and voltage values during the current variation period) and performs computation at a predetermined time point, discarding the requirement to store and process data from the entire period including the idling phase. This reduces storage capacity and computation load while maintaining or improving computation accuracy.
Solution Approach 2:
The invention performs computation at a predetermined time during the current variation period, before the idling phase occurs. This preliminary computation approach eliminates the need to wait for and store data from the idling phase, reducing storage requirements and computation load while providing timely thrust control.
2Reliability
If the conventional method waits for the idling phase to occur before computing motor parameters, then computation can be performed, but the response time increases and the method fails when no idling phase is present
Solution Approach 1:
The invention performs motor parameter computation at a predetermined time during the current variation period, before the idling phase. This preliminary action enables thrust control parameters to be computed in advance, improving response time and ensuring the method works even when no idling phase is present.
Solution Approach 2:
The invention adapts the computation timing to the actual operational conditions by using a predetermined time during the current variation period rather than waiting for a static idling phase. This dynamic approach ensures reliability across different operating scenarios including cases where the brake pad and disc gap is small and no idling phase occurs.
3Adaptability or versatility
If the conventional method uses a fixed computation approach based on idling phase data, then the control method is simple, but it cannot adapt to individual differences and varying use situations
Solution Approach 1:
The invention changes the computation parameters from relying on idling phase data to using current and voltage values at a predetermined time during the current variation period. This parameter change enables adaptation to individual differences and varying use situations while maintaining computational simplicity through a standardized approach.
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 approach enhances computation accuracy of pressing thrust, ensuring consistent braking performance without excessive mechanical stress, even under varying conditions.
Implementation Method 1
an electric brake that presses a pressing member, such as a brake shoe or a drum shoe, against a rotating member, such as a brake disc or a brake drum, by rotation of a motor to perform braking
Data Source
AI summary
Accurately controlling pressing thrust regardless of an individual difference and a use situation of a brake apparatus, and the like are set forth herein. The present invention controls a motor that applies thrust to a piston that presses a brake pad, in a current variation period before an idling current period, a variation in the current and the voltage or a variation in a function including the current and the voltage in the idling current period is computed as a plurality of prospective values. At a predetermined time T0 during the current variation period, one of the plurality of prospective values is selected on the basis of the current and the voltage, and on the basis of the variation in the current and the voltage or the function related to the selected prospective value, a characteristic parameter of the motor is computed to compute a stop current of the motor.