Vehicle Projection Vibration Control Using Predictive Feedback
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Solution Overview
Problem
Existing projection systems in vehicles fail to effectively suppress vibration in images projected on screens due to vehicle movement, affecting image visibility.
Innovation Solution
A projection system with a control device that utilizes acceleration sensors to predict and correct vibration in both the projector and screen, using a feedback mechanism to drive actuators and minimize image vibration through advanced control algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration correction is performed using only feedback from actual measurements, then the control system is simple, but the vibration suppression effectiveness is insufficient due to time delays
Solution Approach 1:
The patent applies preliminary action by using the prediction calculation unit to predict future vibration states of the projector and screen based on current acceleration sensor data and system characteristics. This allows the control system to prepare correction commands in advance, compensating for the inherent time delays in feedback loops and actuator response, thereby improving vibration suppression effectiveness without requiring overly complex real-time control mechanisms
2Reliability
If the control response time is reduced, then vibration suppression effectiveness improves, but the actuator response delay becomes a limiting factor
Solution Approach 1:
The control calculation unit performs preliminary computation of correction commands based on predicted vibration states, preparing the optimal actuator drive signals before vibration actually occurs. This anticipatory control approach compensates for actuator response delays by ensuring commands are ready and optimized in advance, effectively reducing the impact of response time limitations on vibration suppression performance
3Measurement precision
If multiple sensors and calculation units are added to improve prediction accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The prediction calculation unit pre-processes acceleration sensor data and calculates predicted vibration states in advance, organizing and preparing correction commands before they are needed. This preliminary computation approach improves measurement and prediction accuracy by allowing more sophisticated analysis of vibration patterns without requiring all sensor and calculation components to operate simultaneously at full complexity during the actual correction phase
Data Source
AI summary
The present disclosure relates to a projection system, a control device, and a control method capable of effectively suppressing vibration generated in an image.A first acceleration signal output from a first acceleration sensor provided at a bottom of a vehicle is analyzed, vibration to be generated in a screen and a projector device fixed to a ceiling of the vehicle is predicted, a predicted correction value based on the prediction is obtained, and a correction value based on actual measurements is obtained in accordance with relative behavior of the screen and the projector device. Control calculation is then performed by feeding back the correction value to the predicted correction value, and an amount of drive of an actuator for suppressing vibration of an image projected on the screen is obtained. The present technology can be applied to, for example, a projection system mounted on a vehicle.