Wheel Loader Transmission Control to Prevent Shift Shock Spillage
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Solution Overview
Problem
Wheel loaders experience frequent shift shocks during load transport due to frequent changes in transmission gear ratios, which can cause loads to spill from the work implement.
Innovation Solution
A wheel loader with an electric motor and transmission system controlled by a controller that holds the transmission in a predetermined gear during load transport to prevent shifting, thereby suppressing shift shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission changes the transmission gear ratio according to vehicle speed or engine speed, then the wheel loader can adapt to different operating conditions, but shift shocks occur frequently during load transport causing load spillage
Solution Approach 1:
The system dynamically adjusts transmission control strategy based on work mode detection. When load transport mode is detected, the controller prohibits shifting to maintain stability; when other modes are detected, normal adaptive shifting is permitted. This dynamic control approach resolves the contradiction by making the system behavior adaptive to operational context.
Solution Approach 2:
The controller changes the gear ratio parameter from dynamically variable to fixed when load transport mode is detected. This parameter change eliminates shift shocks during load transport while maintaining the ability to use variable gear ratios in other operating conditions, thus resolving the contradiction between adaptability and load stability.
2Productivity
If the transmission frequently shifts gears during load transport, then the wheel loader can optimize performance for different speeds, but shift shocks cause the load to spill from the work implement
Solution Approach 1:
The controller performs preliminary detection of load transport mode and preemptively prohibits gear shifting before shift shocks can occur. This preliminary anti-action prevents the harmful effect of shift shocks on load stability while maintaining operational efficiency by allowing normal shifting in other modes.
Solution Approach 2:
The system dynamically modifies transmission control behavior based on detected work mode. During load transport, shifting is prohibited to eliminate shift shocks; during other operations, normal dynamic shifting is permitted to maintain productivity. This dynamic adjustment resolves the contradiction between operational efficiency and elimination of harmful shift shocks.
3Reliability
If the transmission is held in a fixed gear during load transport, then shift shocks are suppressed, but the transmission cannot adapt to changing speed requirements
Solution Approach 1:
The system implements dynamic control where the transmission gear is fixed during load transport to ensure load stability, but automatically returns to adaptive gear changing in other operating modes. This dynamic switching resolves the contradiction by applying fixed gear control only when necessary for load stability while preserving speed adaptability for other operations.
Solution Approach 2:
The gear ratio parameter is changed from variable to fixed during load transport mode to suppress shift shocks and ensure load stability. When load transport mode ends, the parameter reverts to variable to restore speed adaptability. This conditional parameter change resolves the contradiction between load stability and speed adaptability.
Data Source
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AI summary
A wheel loader includes a vehicle body, an electric motor, a transmission, and a controller. The vehicle body includes a traveling body and a work implement. The electric motor is installed in the vehicle body. The transmission is installed in the vehicle body. The transmission can change a transmission gear ratio by shifting among multiple gears. The transmission transmits a driving force from the electric motor to the traveling body. The controller controls the transmission. The controller acquires a current work mode from multiple work modes corresponding to types of work executed by the vehicle body. When the current work mode is load transport, the controller holds the transmission in a predetermined gear and prohibits the transmission from shifting from the predetermined gear to another gear.