Onboard ECU Threshold Control for Wiper Input Chattering
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Solution Overview
Problem
Existing onboard Electronic Control Units (ECUs) face challenges in accurately controlling wiper drive apparatuses due to chattering issues, leading to low control accuracy and inefficient handling of chattering phenomena.
Innovation Solution
An onboard ECU is designed to acquire input signals, derive count values based on signal changes, and output signals to transition the vehicle control apparatus to an activated state when specific thresholds are reached, thereby improving responsiveness and reducing mistaken operations of onboard apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a chattering removal circuit is used to simply remove chattering from input signals, then chattering is removed, but control accuracy deteriorates because noise-generated chattering is also removed
Solution Approach 1:
The patent applies different threshold values (first threshold and second threshold) to different stages of chattering detection. The first threshold is used to activate the vehicle control apparatus, while the second threshold is used to request actual driving of the onboard apparatus. This localized differentiation allows the system to respond appropriately to chattering at different intensity levels, removing harmful chattering while preserving valid control signals.
Solution Approach 2:
The patent segments the chattering removal process into two distinct stages: activation stage (using first threshold) and driving request stage (using second threshold). This segmentation allows independent optimization of each stage's threshold, enabling the system to tolerate some chattering during activation while being more stringent during actual driving requests, thereby improving control accuracy.
2Ease of operation
If a single threshold is used for chattering detection, then the system is simple to operate, but responsiveness deteriorates when the vehicle control apparatus is in standby state
Solution Approach 1:
The patent implements dynamic threshold adjustment based on the operational state of the vehicle control apparatus. When the apparatus is in standby state, the first threshold (lower value) is applied for faster activation. When the apparatus is already activated, the second threshold (higher value) is applied for driving requests. This dynamic adaptation optimizes responsiveness without requiring complex manual threshold setting.
Solution Approach 2:
The patent prepares two threshold values in advance for different operational scenarios. The first threshold is pre-configured for standby-to-active transitions, while the second threshold is pre-configured for active-state driving requests. This preliminary preparation eliminates the need for real-time threshold calculation, maintaining system simplicity while achieving state-dependent responsiveness.
3Use of energy by moving object
If the vehicle control apparatus remains in standby state to save power, then energy consumption is reduced, but responsiveness deteriorates when activation is needed
Solution Approach 1:
The patent prepares the vehicle control apparatus for rapid activation by pre-configuring the first threshold value and the activation logic while in standby state. When chattering exceeds the first threshold, the apparatus can transition to active state immediately without complex real-time decision-making, thus achieving fast activation while maintaining power-saving standby operation.
Solution Approach 2:
The patent changes the threshold parameter dynamically based on the operational state. The first threshold (lower value) is used when transitioning from standby to active state, enabling faster response. The second threshold (higher value) is used during active operation for driving requests. This parameter change optimizes both power consumption and responsiveness.
Data Source
AI summary
An onboard ECU communicatively connected to an onboard apparatus installed in a vehicle and a vehicle control apparatus that executes processing relating to driving an onboard apparatus includes a control unit that executes processing relating to control of the onboard apparatus, wherein the control unit acquires an input signal relating to control of the onboard apparatus, derives a count value on the basis of changes in the acquired input signal, outputs a first signal for transitioning the vehicle control apparatus to an activated state in a case where the derived count value reaches a first threshold, and outputs a second signal for requesting the onboard apparatus to be driven in a case where the derived count value reaches a second threshold; and the second threshold is a value greater than the first threshold.