Vehicle Engine Idle Speed Control for Circuit Mode Transitions
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Solution Overview
Problem
Existing vehicle control systems fail to effectively differentiate and enhance the performance of a circuit mode from other traveling modes, leading to a lack of driver recognition and potential discomfort.
Innovation Solution
A control device that includes a determination unit to switch the target idle speed to a higher speed in circuit mode, with gradual changes when necessary, and adjusts idle speed based on the vehicle's transmission range to maintain performance and driver comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the target idle speed is increased in circuit mode to improve performance recognition, then the driver can better recognize the circuit mode, but rapid engine speed changes may cause driver discomfort
Solution Approach 1:
The control device switches the target idle speed to a higher speed when circuit mode is detected, but implements gradual change control to prevent sudden transitions. This preliminary adjustment of target speed with controlled transition rate resolves the contradiction by preparing the engine for performance mode while avoiding abrupt changes that would discomfort the driver.
Solution Approach 2:
The system dynamically adjusts the target idle speed based on the detected traveling mode, switching between normal and higher speeds. The gradual change control further dynamicizes the transition process, allowing the engine speed to adapt smoothly to the new target rather than jumping abruptly, thus maintaining driver comfort while achieving mode recognition.
2Speed
If the target idle speed is switched abruptly to a higher speed when entering circuit mode, then the performance difference is more noticeable, but it causes rapid engine speed changes that reduce driver comfort
Solution Approach 1:
The control device calculates a new target idle speed based on the circuit mode detection and implements gradual change control to transition the engine speed to this target. This preliminary setting of a higher target speed with controlled transition rates allows the engine to reach the desired performance speed while avoiding abrupt changes that would discomfort the driver.
Solution Approach 2:
The gradual change control implements periodic adjustments to the fuel injection amount or throttle opening, causing the engine speed to incrementally approach the target idle speed over multiple control cycles. This periodic adjustment strategy enables the engine to smoothly transition to the higher circuit mode speed without sudden jumps, maintaining driver comfort.
3Ease of operation
If the target idle speed is maintained at normal levels in circuit mode, then driver comfort is preserved, but the performance property that differentiates circuit mode from other modes is insufficient
Solution Approach 1:
The control device dynamically switches the target idle speed based on the detected traveling mode, implementing a higher target speed specifically for circuit mode. This dynamic adjustment ensures that the engine delivers noticeably different performance characteristics in circuit mode compared to normal modes, while the gradual change control maintains driver comfort during the transition.
Data Source
AI summary
A control device, for a vehicle, include a determination unit configured to determine whether or not a traveling mode of the vehicle equipped with an engine as a traveling power source is switched to a circuit mode, and a switching unit configured to switch a target idle speed to a higher speed when the determination unit makes an affirmative determination than when the determination unit makes a negative determination.