Engine Speed Limit Control With Tachometer Shift for Circuit Mode
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Solution Overview
Problem
Drivers may misunderstand that the circuit mode is not selected despite selecting it, due to the meter display remaining in a normal driving mode, which can lead to confusion and potential misuse of the vehicle's performance capabilities.
Innovation Solution
A control device that changes the engine's rotation speed limit values and adjusts the meter display regions when the circuit mode is selected, ensuring the driver recognizes the mode change through altered tachometer readings, and includes a process to manage engine durability and temperature considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the circuit mode is selected and the engine rotation speed limit is increased, then the driving performance is improved, but the meter display remains in the normal driving mode indicating the lower rotation speed limit, causing driver confusion
Solution Approach 1:
The control device receives meter display control information from the meter control device and uses this feedback to determine when to adjust the tachometer display. The system continuously monitors the meter display state and adjusts the rotation speed limit indication accordingly, ensuring the display reflects the actual engine operation mode.
Solution Approach 2:
The control device changes the display parameter of the tachometer from indicating the first rotation speed limit to indicating the second rotation speed limit when circuit mode is activated. This parameter change ensures the meter display accurately reflects the current operating mode and the corresponding rotation speed limit.
2Speed
If the boundary rotation speed is changed rapidly from the first boundary rotation speed to the second boundary rotation speed, then the meter display quickly reflects the circuit mode, but this rapid change may cause display instability or misreading
Solution Approach 1:
The control device predicts the second boundary rotation speed based on the relationship between the first and second boundary rotation speeds before actually switching to circuit mode. This preliminary calculation ensures the display transitions smoothly and accurately reflects the new rotation speed limit without causing instability or misreading.
3Productivity
If the rotation speed limit is increased for circuit mode, then the driving performance on closed courses is improved, but the engine durability may be compromised at higher rotation speeds
Solution Approach 1:
The control device dynamically adjusts the rotation speed limit based on the selected driving mode. In normal mode, the first rotation speed limit is applied to ensure engine durability. When circuit mode is selected, the second rotation speed limit (higher than the first) is applied to improve driving performance on closed courses. The system provides different rotation speed limits for different operating conditions.
Data Source
AI summary
A control device, for an engine provided in a vehicle, is configured to change a rotation speed limit value for the engine from a first rotation speed limit value to a second rotation speed limit value higher than the first rotation speed limit value, when a circuit mode is selected as a driving mode of the vehicle, and the control device is configured to transmit first meter display control information to a meter control device controlling a display device provided in a vehicle cabin of the vehicle on a basis of the second rotation speed limit value.