EV Tachometer Display Layout for Redline and Over-Rev Indication
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Solution Overview
Problem
Conventional electric vehicles simulating virtual engines and transmissions waste screen resources by displaying a large range beyond the redline rotational speed, leading to inefficient use of display space.
Innovation Solution
An electric vehicle that changes torque output by an electric motor to simulate rotational speed-torque characteristics, using a control device to move an indicator within a first display area below the redline and restrict its movement to a second area outside the redline, minimizing waste while clearly indicating the rotational state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tachometer displays a large range from redline rotational speed to maximum rotational speed to accommodate over-rev states, then the driver can understand over-rev conditions, but screen resources on the display screen are wasted
Solution Approach 1:
The display screen is segmented into a first display area for normal rotational speeds (0 to redline) and a second display area for over-rev speeds (above redline). The indicator needle is segmented into a first needle portion displaying in the first display area and a second needle portion displaying in the second display area. This segmentation allows the display to efficiently use screen space while accurately indicating both normal and over-rev rotational speeds.
2Loss of information
If the indicator continuously moves within a large display area to show high rotational speeds, then the driver can see the magnitude of over-rev speed, but the display area becomes excessively large and wastes screen resources
Solution Approach 1:
The display transitions from a one-dimensional continuous scale to a two-area segmented display. The first needle portion displays in the first display area with continuous movement, while the second needle portion displays in the second display area. This dimensional change allows the system to convey rotational speed information without requiring a single large continuous display area, thus saving screen resources while maintaining information accuracy.
Data Source
AI summary
The electric vehicle is adapted to change the torque output by an electric motor to simulate the rotational speed-torque characteristic of a virtual rotating machine in response to driver operation. The electric vehicle comprises a display device and a control device. The control device displays on a display screen of the display device an indicator representing a virtual rotational speed of the virtual rotating machine. In a rotational speed range below the redline rotational speed of the virtual rotating machine, the control device continuously or discretely moves the indicator within a first display area of the display screen according to the magnitude of the virtual rotational speed. In a rotational speed range higher than the redline rotational speed, the control device moves the indicator to a second display area outside the first display area, and limits the movement of the indicator within the second display area.