Vehicle Door Drive Mechanism Sensor Abnormality Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automatic opening/closing systems for vehicles, such as doors and tailgates, face challenges in detecting sensor abnormalities, leading to inappropriate control and safety concerns, especially when the system is in operation and the sensor fails mid-cycle, causing the opening/closing body to move at excessive speeds.
Innovation Solution
An opening/closing body drive mechanism that includes a detecting unit to monitor the movement state, a control unit to manage the drive based on feedback control, and a threshold system to determine abnormality by comparing detected information with predetermined values, ensuring safe operation by adjusting the control value to prevent excessive speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is used to maintain target speed, then movement control precision is improved, but sensor abnormality cannot be detected until the opening/closing body reaches the fully closed position
Solution Approach 1:
The patent applies preliminary action by checking sensor abnormalities at multiple intermediate positions during the opening/closing movement, rather than waiting until the fully closed position. The control unit performs abnormality determination at predetermined positions along the movement path, enabling early detection of sensor failures and preventing inappropriate control actions.
2Reliability
If sensor abnormality is detected late, then inappropriate control continues, but safety risks increase due to excessive movement speed
Solution Approach 1:
The patent implements feedback control by continuously monitoring sensor outputs at multiple positions during opening/closing movement and comparing them against expected values. When a discrepancy exceeds a threshold, the system detects sensor abnormality and adjusts control to prevent excessive speeds, thereby maintaining safety while ensuring control accuracy.
3Reliability
If additional components are added for abnormality detection, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling the existing control unit to perform both feedback control and sensor abnormality detection functions. The control unit utilizes sensor outputs during normal operation to simultaneously maintain target speed and detect abnormalities at predetermined positions, eliminating the need for separate detection components and reducing overall system complexity.
Data Source
AI summary
An opening and closing body drive mechanism that drives an opening and closing body between an open position and a closed position; a drive unit to drive the opening and closing body; a detecting unit to detect movement of the opening and closing body; and a control unit to control driving of the opening and closing body. The control unit carries out a feedback control to control driving of the opening and closing body such that the movement of the opening and closing body, detected with the detecting unit, matches a predetermined target value when no abnormality occurs in the detecting unit or in wiring connecting the detecting unit and the control unit.