Variable Increment Engine Speed Control for PTO Systems
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Solution Overview
Problem
Existing engine control systems for vehicles with power take-off (PTO) systems lack flexibility in user-controlled engine speed adjustments, requiring fixed increments and inefficient return to default speeds, leading to unnecessary stress on the engine and PTO system.
Innovation Solution
An engine control system with user input device that allows for incremental increases and decreases in engine speed, including a speed cancellation feature, and the ability to reverse net speed changes, enabling more precise control of rotational power to auxiliary devices while the vehicle is stationary or moving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed increment buttons are used for engine speed adjustment, then the control system is simple to operate, but the user cannot make precise adjustments or efficiently return to default speeds
Solution Approach 1:
The control system dynamically changes the increment size based on the current engine speed. When engine speed is below a threshold, smaller increments (e.g., 50 rpm) are used for precise control. When above the threshold, larger increments (e.g., 200 rpm) are used for faster adjustment, allowing the system to adapt to different operating conditions
Solution Approach 2:
The system changes the parameter of increment size based on the current engine speed state. The control module automatically selects between different increment values (first increment vs. second increment) depending on whether the current speed is below or above the threshold, enabling both precision and efficiency
2Power
If the engine speed is increased by fixed increments to support PTO operation, then the PTO system receives sufficient power, but the engine experiences unnecessary stress and wear
Solution Approach 1:
Instead of always applying maximum or fixed large increments to ensure sufficient power, the system applies partial action by using smaller increments when the engine speed is already below the threshold. This provides just enough power increase to reach the optimal range without excessive stress
Solution Approach 2:
The control module continuously monitors the current engine speed and compares it to the threshold to determine the appropriate increment size. This feedback mechanism ensures that speed adjustments are optimized based on real-time conditions, preventing both insufficient power and excessive stress
3Speed
If large fixed increments are used for engine speed adjustment, then the system responds quickly to power demands, but the user cannot make fine-tuned adjustments
Solution Approach 1:
The increment size is dynamically adjusted based on the current engine speed relative to the threshold. Below the threshold, smaller increments provide fine-tuned control for precision. Above the threshold, larger increments enable faster response to power demands, optimizing both speed and precision based on conditions
Data Source
AI summary
An engine control system includes an engine with an output shaft. A power take-off device interfaces with the output shaft and provides rotational power to an auxiliary device. A user input device includes a first engine speed control that commands an increase in engine speed by a first amount to increase the rotational power to the auxiliary device when a user selects the first engine speed control. A second engine speed control commands an increase in engine speed by a second amount that is greater than the first amount to increase the rotational power to the auxiliary device when the user selects the second engine speed control. The user input device includes a speed cancellation control that commands a reversal of a net increase in the speed of the engine that is commanded via the user input device when the user selects the speed cancellation control.