Harvester Engine Speed Control for Stalling Prevention
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Solution Overview
Problem
Self-propelled harvesters face the risk of internal combustion engine stalling when starting from standstill due to insufficient torque at low driving speeds, especially when transitioning from idle speed to required driving speed during road driving mode.
Innovation Solution
A method where the control device adjusts the engine speed to a starting speed significantly above the idle speed to ensure sufficient torque for starting, then reduces to the speed required for maximum permissible driving speed, minimizing stalling risks and optimizing fuel consumption and noise emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine speed is adjusted to the speed required to reach the permissible maximum driving speed during road driving mode, then fuel consumption is reduced, but the internal combustion engine stalls due to insufficient torque at low driving speeds
Solution Approach 1:
The control device dynamically changes the engine speed parameter based on driving conditions. During road driving mode, when the drive lever is actuated, the control device specifies a starting speed that is higher than the speed required for maximum driving speed. This parameter change ensures sufficient torque is available during acceleration from standstill, preventing engine stalling while still allowing for fuel-efficient operation at the required driving speed once accelerated.
2Reliability
If a higher engine speed is maintained during starting process, then sufficient torque is available to prevent stalling, but noise emissions and fuel consumption increase
Solution Approach 1:
The control device dynamically adjusts the engine speed during the starting process. It specifies a starting speed that is higher than the speed required for maximum driving speed, but this higher speed is maintained only temporarily during acceleration from standstill. Once the harvester reaches the required driving speed, the control device reduces the engine speed to the lower level required for efficient operation. This dynamic adjustment prevents engine stalling during starting while minimizing noise emissions and fuel consumption during sustained operation.
Data Source
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AI summary
The present invention relates to a method for operating a self-propelled harvesting machine (1), which is selectively operated in a harvesting mode and a road driving mode, comprising an internal combustion engine (10), the speed of which is set by a control device (22) depending on the selected operating mode, wherein in road driving mode, the control device (22) specifies a starting speed (nStart) for a starting process from standstill, which is reduced to an engine speed (nred1, nred2, nred3) required to reach a permissible maximum driving speed (vmax1, vmax2, vmax3).