Vehicle Meter Display Wake-Up for ODO Mileage Access
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Solution Overview
Problem
In existing display control systems, when the vehicle is stopped, both the display control ECU and the meter apparatus are in a sleep state, and simply activating the meter apparatus does not enable the display control ECU to transmit video data, such as mileage information, to the meter apparatus, preventing the display of necessary information without starting the engine.
Innovation Solution
The meter apparatus transmits an activating signal to the display control ECU via the in-vehicle network when the ODO/TRIP switch is operated, allowing the display control ECU to activate and transmit video data, including mileage information, to the meter apparatus, ensuring that the necessary information is displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the meter apparatus is activated while the display control ECU remains in sleep state, then the display apparatus can operate independently, but video data transmission from the display control ECU is prevented
Solution Approach 1:
The meter apparatus transmits an activation signal to the display control ECU before video data transmission is needed. This preliminary action wakes up the display control ECU from sleep state, ensuring it is ready to transmit video data when the user operates the ODO/TRIP switch, thus resolving the contradiction between independent operation and reliable data transmission.
2Use of energy by moving object
If both display control ECU and meter apparatus remain in sleep state, then energy consumption is reduced, but information accessibility is lost
Solution Approach 1:
The system dynamically transitions between sleep and active states based on user interaction. When the ODO/TRIP switch is operated, the meter apparatus activates the display control ECU, transitioning from energy-saving sleep mode to information-providing active mode. This dynamic state change resolves the contradiction between energy conservation and information accessibility.
3Reliability
If the display control ECU is activated continuously, then video data transmission is always available, but energy consumption increases
Solution Approach 1:
The display control ECU operates in periodic cycles, remaining in sleep state to conserve energy and activating only when needed. The meter apparatus triggers activation by sending a signal when the ODO/TRIP switch is operated, creating a periodic on-demand activation pattern that balances energy consumption with reliable video data transmission availability.
Data Source
AI summary
A display apparatus is configured to activate a display control apparatus by transmitting an activating signal to the display control apparatus in response to determining that a start condition is satisfied. In response to receiving the activating signal, the display control apparatus is enabled to transmit a video data corresponding to a video to be displayed in a display in the display apparatus.