Dual-Transmission Powertrain Control for Nonsynchronous Shift Compensation
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Solution Overview
Problem
Existing powertrains in mobile machines experience temporary disruptions during gear shifts due to nonsynchronous shifts, particularly in continuously variable transmissions (CVTs), leading to inefficiencies and power interruptions.
Innovation Solution
A powertrain system with a primary and secondary transmission, regulated by an electronic controller that predicts nonsynchronous shifts in the primary transmission and adjusts the secondary transmission concurrently to maintain consistent motive power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a continuously variable transmission (CVT) is used to provide continuous torque-to-speed output ratios, then adaptability is improved, but reliability deteriorates due to nonsynchronous shifts causing power interruptions
Solution Approach 1:
The electronic controller predicts upcoming nonsynchronous shifts in the primary transmission and preemptively adjusts the secondary transmission to compensate before the power interruption occurs. This preliminary action maintains continuous power delivery by preparing the secondary transmission to take over or supplement power delivery during the predicted shift event.
Solution Approach 2:
The secondary transmission acts as an intermediary power delivery path that compensates for disruptions in the primary transmission. When the primary transmission experiences a nonsynchronous shift, the secondary transmission provides a backup or supplemental power path, ensuring continuous motive power reaches the driven elements without interruption.
2Reliability
If traditional fixed gear transmissions are used to operate in different ranges, then reliability is improved, but adaptability deteriorates requiring physical reconfiguration
Solution Approach 1:
The system employs both primary and secondary transmissions that can independently or concurrently provide power delivery across multiple operating ranges. This multi-functional arrangement allows the powertrain to operate in different ranges without physical reconfiguration, as either transmission can be selected or combined to meet the required operating conditions.
Solution Approach 2:
The electronic controller dynamically selects and coordinates between the primary and secondary transmissions based on real-time operating conditions, load requirements, and predicted shift events. This dynamic coordination allows seamless transitions between different power delivery paths and operating ranges without physical reconfiguration of the transmission system.
3Adaptability or versatility
If gear shifts are performed to change operating ranges, then adaptability is improved, but productivity deteriorates due to temporary power transmission disruption
Solution Approach 1:
The secondary transmission ensures continuous useful action during primary transmission shifts by maintaining power delivery to the driven elements. When the primary transmission undergoes a gear shift or reconfiguration, the secondary transmission continues to deliver motive power without interruption, eliminating productivity losses associated with power transmission disruptions.
Solution Approach 2:
The electronic controller predicts upcoming shifts in the primary transmission and preemptively coordinates the secondary transmission to maintain power delivery. This preliminary coordination ensures that the secondary transmission is ready to compensate before the primary transmission disruption occurs, maintaining continuous productive operation throughout the shift event.
4Adaptability or versatility
If the physical configuration of CVT is changed to enable full continuous range, then adaptability is improved, but device complexity increases
Solution Approach 1:
The powertrain system is segmented into two independent transmission paths (primary and secondary transmissions), each capable of providing power delivery across different portions of the continuous range. This segmentation allows the system to achieve full continuous range adaptability without requiring a single complex transmission configuration, as the combined capability of both transmissions provides the complete operating range.
Data Source
AI summary
A mobile machine includes a powertrain having a primary transmission connected to a primary axle and a secondary transmission connected to a secondary axle. To regulate operation of the powertrain, the mobile machine is associated with a powertrain control system. The powertrain control system receives data inputs and powertrain characteristics and predictively estimates if nonsynchronous shift will occur with the primary transmission. The powertrain control system adjusts a secondary power output of the secondary transmission in response to and concurrently with the nonsynchronous shift.