Intersecting Needle Speedometer for Gear Shift Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional speedometers and tachometers require drivers to constantly monitor multiple gauges, making it difficult to synchronize engine and vehicle speeds for smooth gear changes, especially in vehicles with traditional side-by-side pure-rotation tachometers, which are not easily adaptable for retrofitting and can become inaccurate with gear ratio changes.
Innovation Solution
A combined speedometer and tachometer design using intersecting needles to represent vehicle and engine speeds on a single viewing field, with the intersection points plotting overall drive ratios for each gear, allowing for accurate synchronization of engine and vehicle speeds during gear changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate tachometers and speedometers are used, then engine speed and vehicle speed can be monitored independently, but the driver must constantly switch between multiple gauges, increasing complexity and reducing ease of operation
Solution Approach 1:
The patent combines separate tachometer and speedometer functions into a single gauge with intersecting needles. The vehicle speed needle and engine speed needle intersect on a common dial face, allowing the driver to monitor both speeds simultaneously at one location rather than switching between separate gauges.
Solution Approach 2:
The single gauge serves multiple functions by displaying both vehicle speed and engine speed on the same instrument. The intersecting needle mechanism allows one gauge to perform the work of two separate gauges, reducing the number of instruments the driver must monitor.
2Measurement precision
If traditional side-by-side tachometers and speedometers are used, then both speeds can be displayed, but it becomes difficult to visually correlate engine speed with vehicle speed for smooth gear changes
Solution Approach 1:
By placing both speed measurements on a single dial with intersecting needles, the patent creates a visual relationship between engine speed and vehicle speed. The intersection point and relative positions of the needles provide immediate visual correlation, helping the driver understand the relationship between the two speeds for optimal gear shifting.
Solution Approach 2:
The patent adds a visual dimension by using intersecting needles on a common plane. Instead of two separate one-dimensional scales, the intersecting needles create a two-dimensional visual field where the driver can simultaneously perceive both speeds and their relationship, making gear change timing more intuitive.
3Ease of operation
If a single combined gauge is used, then driver attention can be focused on the road, but the gauge must accurately represent both engine speed and vehicle speed relationships across different gear ratios
Solution Approach 1:
The patent merges tachometer and speedometer mechanisms into a single gauge assembly with intersecting needles. This consolidation reduces the number of separate instruments while maintaining accurate representation of both speeds, though it increases the internal mechanical complexity of the single gauge.
Solution Approach 2:
The intersecting needle mechanism allows dynamic adjustment of the display to reflect different gear ratios. The gauge can be calibrated or adjusted to show accurate relationships between engine speed and vehicle speed across multiple gears, making the single gauge adaptable to various operating conditions.
4Measurement precision
If separate gauges are used, then each can be optimized for its specific function, but retrofitting becomes difficult and recalibration is required for different gear ratios
Solution Approach 1:
The single intersecting needle gauge is designed to be universally applicable by replacing both the tachometer and speedometer with one instrument. This universal solution can be retrofitted into vehicles originally equipped with separate gauges, and the single gauge can be calibrated to work with different gear ratios without requiring multiple specialized instruments.
Data Source
AI summary
A combined vehicle-speed and engine-speed indicating device that replaces or supplements the function of a manufactured vehicle's existing radial-dial tachometer and radial-dial speedometer with a single coordinate field and two translating indicators that follow paths set to a vehicle's set of overall-gear ratios correlating with each of its transmission's driver-selectable gears to give a vehicle's driver a tool by which to optimize selection of gear ratio, engine speed, and vehicle speed for smooth and efficient progress in a vehicle.