Display Device for Internal Combustion Engine with Variable Compression Ratio
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Solution Overview
Problem
Existing display devices for internal combustion engines fail to accurately and consistently show fuel efficiency, leading to false recognition by drivers due to frequent fluctuations in instantaneous fuel efficiency caused by changes in accelerator operation and vehicle speed.
Innovation Solution
A display device with an indicator section that maintains a constant or slight indication of engine compression ratio within specific dead zones, preventing unexpected changes near the upper or lower limits, and includes a turbocharger for supercharging intake air, along with a variable compression ratio mechanism to vary engine compression ratio, allowing drivers to recognize the engine state effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If instantaneous fuel efficiency is displayed based on fuel consumption and vehicle speed, then fuel efficiency information is provided to the driver, but the indication fluctuates frequently causing false recognition and driver confusion
Solution Approach 1:
The system pre-defines multiple predetermined display patterns corresponding to different engine operation regions (low load, high load, intermediate load). Instead of calculating and displaying fluctuating instantaneous fuel efficiency, the system proactively selects and displays the appropriate predetermined pattern based on current engine operating conditions, providing stable and reliable visual feedback to the driver about fuel efficiency status.
2Loss of energy
If engine compression ratio is varied to optimize fuel efficiency, then fuel consumption is reduced, but the indication changes unexpectedly near upper or lower limits causing strange feeling to driver
Solution Approach 1:
The system applies different display characteristics to different engine operation regions. In low load and high load regions, specific display patterns are used that provide appropriate visual feedback. The display behavior is locally optimized for each operation region, ensuring that the indication appropriately reflects engine state without causing driver confusion or strange feelings during compression ratio transitions.
3Measurement precision
If display shows detailed instantaneous fuel efficiency changes, then measurement precision is improved, but device complexity increases due to multiple calculation parameters
Solution Approach 1:
Instead of implementing a complex real-time calculation system that continuously computes instantaneous fuel efficiency from multiple parameters (fuel consumption, vehicle speed, accelerator operation), the system uses predetermined display patterns that are selected based on engine operation region. This replaces complex continuous calculation with simpler pattern selection, reducing computational complexity while maintaining informative display.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a stable and accurate representation of engine compression ratio, reducing driver confusion and encouraging fuel-efficient driving by maintaining consistent indications within dead zones, thereby enhancing driver recognition and adherence to energy-conserving or high-power driving modes.
Implementation Method 1
the internal combustion engine 1 for a vehicle, to which first and second embodiments of the present invention are applied, includes a turbocharger 2 between an exhaust passage 4 and an intake passage 3, wherein turbocharger 2 is structured to supercharge intake air by using exhaust energy
Data Source
AI summary
A display device for an internal combustion engine includes a variable compression ratio mechanism structured to vary an engine compression ratio of the internal combustion engine. The display device includes an indicator structured to vary its indication depending on the engine compression ratio. The indicator is configured to maintain the indication constant or within a slight change with respect to a change in the engine compression ratio within each of at least one of first and second dead zones of the engine compression ratio. The first dead zone includes a vicinity of an upper limit of the engine compression ratio including the upper limit. The second dead zone includes a vicinity of a lower limit of the engine compression ratio including the lower limit.