Engine Speed Indicator Control for Smoother Vehicle Acceleration
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Solution Overview
Problem
In vehicles with internal combustion engines, when the operating point of the engine changes based on vehicle conditions, the indicated rotational speed may differ from the intended rotational speed, causing user discomfort due to a discrepancy between the shown and intended rotational speeds.
Innovation Solution
An indicator control system that adjusts the indicated rotational speed to match the intended user experience by maintaining the initial rotational speed during a specific period when the engine speed temporarily decreases and then increases, thereby reducing the discrepancy between intended and shown rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the indicator shows the actual rotational speed of the internal combustion engine during operating point changes, then the indicator accurately reflects the engine state, but the user experiences discomfort due to discrepancy between intended and shown rotational speeds
Solution Approach 1:
Instead of showing the actual engine rotational speed directly, the indicator displays an inverted or alternative representation - specifically, during transient periods when engine speed temporarily decreases before increasing, the indicator maintains or increases the shown speed rather than following the actual decrease. This inversion resolves the contradiction by prioritizing user perception over strict measurement accuracy.
Solution Approach 2:
The indicator control system changes the parameter being displayed based on operating conditions. During specific transient periods (detected by the control unit), the indicator displays a modified rotational speed value that differs from the actual engine speed. This parameter change allows the system to maintain measurement accuracy while adjusting the displayed value to prevent user discomfort.
2Object-affected harmful factors
If the indicator control system adjusts the indicated rotational speed to match user intent during specific periods, then user discomfort is reduced, but the indicator no longer shows the true engine rotational speed
Solution Approach 1:
The indicator system dynamically adjusts its display based on real-time detection of engine operating conditions. The control unit monitors engine speed changes and dynamically switches between showing actual speed and adjusted speed depending on the detected transient state. This dynamic behavior allows the system to maintain accuracy when appropriate while preventing discomfort during transients.
Solution Approach 2:
The control unit acts as an intermediary between the actual engine speed sensor and the indicator display. It processes the actual speed signal and determines whether to pass it through unchanged or to modify it based on detected transient conditions. This intermediary function resolves the contradiction by mediating between true measurement and user-friendly display.
3Object-affected harmful factors
If the indicator maintains the initial rotational speed during engine transient periods, then the difference between intended and shown rotational speed is reduced, but the indicator response becomes non-linear
Solution Approach 1:
The control system applies preliminary anti-action by detecting transient periods in advance and preemptively adjusting the indicator display to counteract the upcoming discrepancy between intended and actual speed. By anticipating the transient condition and adjusting the display accordingly, the system prevents user discomfort before it occurs, accepting non-linear response as the trade-off.
Data Source
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AI summary
An indicator control system includes an indicator (36) configured to show a rotational speed of an internal combustion engine (13), and a controller (11) configured to control an indicated rotational speed, which is the rotational speed to be shown by the indicator (36). The controller (11) is configured such that, during a specific period in which the rotational speed of the internal combustion engine (13) is reduced from a first rotational speed to a rotational speed lower than the first rotational speed and then increased to a second rotational speed higher than the first rotational speed, the controller (11) increases the indicated rotational speed to the second rotational speed without reducing the indicated rotational speed from the first rotational speed to the rotational speed lower than the first rotational speed.