Electronic Gear Shift Selector for Heavy Vehicle Non-Consecutive Gears
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Solution Overview
Problem
Existing automatic manual transmission gear shift assemblies in vehicles do not allow operators to directly shift between non-consecutive gears, leading to gearshift delays and undesirable transitions due to the need to interrupt the first gear shift request.
Innovation Solution
An electronic gear shift selector with a counter and time delay circuit that enables direct shifting between non-consecutive gears by delaying communication of the number of toggle switch assertions, allowing operators to select desired gears without interrupting ongoing shifts, and featuring a system that displays and audibly indicates the selected gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator presses the +/â button multiple times to shift between non-consecutive gears, then the gear shift request is transmitted to the gearbox, but the first gear shift request must be interrupted by the second gear request causing gearshift delay
Solution Approach 1:
The system counts the number of toggle switch assertions in advance before executing the gear shift command. By preliminarily detecting and counting multiple button presses, the system can determine the total number of gear shifts required and execute them as a single coordinated operation, eliminating the delay caused by interrupting the first shift request with a second one.
2Manufacturing precision
If the operator presses the +/â button to change gears one step at a time, then the gear shift is controlled precisely, but the time required to shift between non-consecutive gears increases
Solution Approach 1:
The counter circuit detects and counts multiple toggle switch assertions in advance, determining the total number of gear shifts required before execution. This preliminary detection allows the system to execute multiple gear shifts in a single coordinated operation rather than sequentially, thereby maintaining precise gear selection while significantly reducing the total time required for gear shifting.
Solution Approach 2:
The system uses a counter to create a digital representation of the operator's intent (number of desired gear shifts) and processes this copied information to execute the appropriate number of gear changes. This allows the system to understand and execute multi-step gear shifts as a single coordinated action based on the counted assertions.
Data Source
AI summary
Method and arrangement for providing an electronic gear shift selector associated with an automatic mechanical transmission for a heavy vehicle. The gear shift selector includes a toggle switch for asserting at least one gear shift request, a counter receiving the at least one gear shift request, and a time delay for preventing communication of the at least one gear shift request from the counter until a predefined time period has passed. A method for communicating a collective gear shift request to a gear box includes asserting one or more gear shift requests with a gear shift selector, communicating the gear shift requests to a counter, determining the collective gear shift requests occurring within a predefined time period, communicating the gear shift requests occurring within the predefined time period to a gearbox.