Clutch Pedal Signal Processing for Brake Release Timing
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Solution Overview
Problem
Existing motor vehicle assistive devices for uphill maneuvers are not robust due to noise in clutch pedal position signals from sensors, leading to premature or late release of the braking system, especially during rapid clutch pedal movements.
Innovation Solution
A signal processing method involving filtering and substitution phases to generate a processed clutch pedal position signal, using first and second filters, derivation, and parameter adjustments to improve the accuracy of anticipated clutch pedal position estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the instantaneous position of the clutch pedal is used to determine the torque transmitted by the clutch, then the response time is reduced, but the noise in the position sensor signal causes substantial disturbance leading to premature or late release of the braking system
Solution Approach 1:
The patent applies preliminary action by calculating an anticipated position of the clutch pedal that accounts for the brake system release time constant. Instead of using the instantaneous position at the moment of release, the system computes where the pedal will be positioned after the predetermined time delay, thereby compensating for the delay and achieving accurate torque determination at the correct release moment
Solution Approach 2:
The patent introduces an intermediary computational process that acts as a mediator between the noisy sensor signal and the brake control system. This intermediary calculates a filtered and anticipated pedal position that smooths out signal noise while preserving the essential movement information, thereby reducing disturbance without sacrificing response accuracy
2Reliability
If filtering is applied to reduce noise in the position signal, then the reliability of brake release timing is improved, but the response time increases due to the filtering delay
Solution Approach 1:
The patent applies preliminary action by pre-calculating the anticipated pedal position that incorporates the predetermined time constant for brake release. This allows the system to compensate for filtering delay in advance, ensuring that the torque determination reflects the actual release moment without requiring excessive filtering that would increase delay
Solution Approach 2:
The patent optimizes the balance between filtering and response time by carefully selecting the filtering parameters and the predetermined time constant. The filtering is tuned to reduce noise while maintaining acceptable response characteristics, and the time constant is chosen to match the actual brake system response characteristics
3Measurement precision
If the derivative of the clutch pedal position is used to calculate the anticipated position, then the brake release timing accuracy is improved, but rapid movements of the clutch pedal cause substantial disturbance
Solution Approach 1:
The patent applies beforehand cushioning by using filtering to smooth the derivative signal before it is used in the anticipated position calculation. This preprocessing step cushions against the harmful effects of rapid pedal movements that would otherwise cause substantial disturbance, while still preserving the essential information needed for accurate torque determination
Data Source
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AI summary
The invention relates to a method for processing a signal (θclutch) originating from a position sensor (3) of a motor vehicle (7) control member, intended to produce a processed signal relating to the position of the control member. The invention is characterised in that the method includes: a filtering phase in which the signal originating from the sensor is filtered using a first filter (27) in order to obtain a first filtered signal (θclutch_f); and a substitution phase in which the first filtered signal is supplied as the processed signal, a second signal being added to the first filtered signal if the instantaneous value thereof is greater than the value of a first threshold parameter (θClutch_antLB), and, in the opposite case, the signal originating from the sensor is provided as the processed signal.