Vehicular Wheelspin Detection Control Logic
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Solution Overview
Problem
Existing vehicular control systems often erroneously detect wheelspin, leading to unnecessary drive power restriction and driver discomfort, particularly on low μ roads where follow-up acceleration can mimic wheelspin conditions.
Innovation Solution
A vehicular control apparatus that includes a drive power control unit, a brake action detection unit, a wheelspin detection unit, and a time measurement unit, which sets a detection disabled period to differentiate between follow-up acceleration and actual wheelspin, enabling accurate wheelspin detection only after the disabled period has elapsed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wheelspin detection is performed continuously based on rotational speed changes, then wheelspin can be detected promptly, but erroneous detection occurs during follow-up acceleration after brake release
Solution Approach 1:
The control unit sets a detection disabled period in advance after detecting brake release, preventing erroneous wheelspin detection during the anticipated follow-up acceleration phase before it occurs
Solution Approach 2:
The detection disabled period acts as an intermediary time window that separates the brake release event from wheelspin detection, allowing the system to distinguish between normal follow-up acceleration and actual wheelspin conditions
2Strength
If drive power is restricted immediately upon wheelspin detection, then power transmission system is protected, but unnecessary restriction occurs during false detection leading to driver discomfort
Solution Approach 1:
The control unit applies preliminary anti-action by disabling wheelspin detection during the detection disabled period, preventing false drive power restriction before erroneous detection can occur
Solution Approach 2:
The system performs preliminary action by setting the detection disabled period in advance after brake release detection, ensuring drive power is not unnecessarily restricted during the anticipated acceleration phase
Data Source
AI summary
A vehicular control apparatus includes: a drive power control unit that controls drive power from a drive unit that drives drive wheels of a vehicle; a brake switch (a brake action detection unit) that detects a brake action performed on a brake unit, the brake action including decelerating and stopping the vehicle; a wheelspin detection unit that detects spinning of the drive wheels; a time measurement unit that, when the drive wheels being stopped start to rotate, measures time elapsed since the start of the rotation; and a control unit that enables the wheelspin detection unit to perform detection after a preset detection disabled period elapses since the time measurement unit has started measuring the time.