In-Vehicle Control Device Position Storage for Assist System Activation
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Solution Overview
Problem
Conventional in-vehicle control devices face challenges in accurately determining the current position of a vehicle immediately after activation, which delays the execution of assist control functions.
Innovation Solution
A control device with a position acquisition section, information acquisition section, storage control section, and control execution section that calculates and determines the device-to-device distance using navigation satellite signals and stored device positions, allowing for immediate execution of assist control when the distance threshold is met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite navigation is used to detect current position, then position accuracy is improved, but time to start assist control increases
Solution Approach 1:
The patent applies preliminary action by storing the current position in nonvolatile storage before power-off. This pre-stored position data is then used immediately upon power-on, eliminating the need to wait for satellite navigation to acquire position data from scratch. The system performs the position acquisition and storage action in advance, so that when assist control is needed after power-on, the position information is already available.
Solution Approach 2:
The patent uses copying by creating a copy of the current position data and storing it in nonvolatile storage. This copied position information serves as a substitute for real-time satellite navigation data during the initial period after power-on. Instead of relying solely on live satellite signals, the system uses the copied position data to enable immediate assist control functionality.
2Reliability
If current position is determined using satellite navigation signals, then position reliability is improved, but device activation time increases
Solution Approach 1:
The system performs preliminary action by acquiring and storing position information before power-off occurs. This pre-acquired position data is saved in nonvolatile storage, allowing the device to bypass the time-consuming satellite signal acquisition process during initial power-on. The position reliability is maintained because the stored data reflects the actual position at the time of storage.
Solution Approach 2:
The nonvolatile storage acts as an intermediary between the position acquisition system and the assist control system. Instead of directly relying on satellite navigation signals every time assist control is needed, the system uses the stored position data as an intermediate solution. This intermediary mechanism enables faster activation while maintaining position information availability.
3Measurement precision
If assist control waits for accurate satellite position data, then control accuracy is improved, but response time deteriorates
Solution Approach 1:
The patent implements preliminary action by storing the current position in nonvolatile storage before power-off. This pre-stored position information enables the assist control to start immediately upon power-on without waiting for satellite navigation to acquire and process signals. The position precision is preserved because the stored data represents the actual position at the time of storage.
Data Source
AI summary
A control device is provided with: a position acquisition section for acquiring a current location; an information acquisition section for acquiring, from a specific device, device position information including a device position indicating the position of the specific device; a storage control section for storing the current position of the control device into a nonvolatile storage device; and a control execution section for executing driving assist control based on a current-time position of the control device and the device position information. The control execution section is provided with: a distance calculation section for calculating a distance between the device position and the stored position; and a distance determination section for determining whether or not the device-to-device distance is smaller than a distance threshold which is a prescribed distance. When the device-to-device distance is smaller than the distance threshold, the control execution section starts execution of the assist control.