Tunable Engine Speed Control for Diverse PTO Applications
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Solution Overview
Problem
Existing engine speed control systems for power take-off (PTO) devices struggle to provide optimal engine speed stability and responsiveness for diverse accessory applications, as fixed PID control characteristics fail to meet varying demands, leading to inadequate performance and operator confusion when adjusting gain settings.
Innovation Solution
A tunable engine speed control system that includes a setting map data store and a driver interface, allowing operators to select responsiveness values, which determines and applies corresponding gain settings to the PID controller, enabling adjustable engine speed control based on actual and target engine speed values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed PID control characteristics are used for a given vehicle model, then the control system is simple to implement, but it cannot meet the varying demands of diverse accessory applications
Solution Approach 1:
The patent implements dynamic adaptability by allowing the controller to select from multiple predetermined sets of control characteristics (gain settings) based on the specific accessory application. This enables the fixed control system to adapt to varying demands without requiring complex real-time adjustment mechanisms, thus improving versatility while maintaining relative simplicity.
Solution Approach 2:
The patent changes the parameters of the PID controller by providing multiple predetermined sets of gain settings (Kp, Ki, Kd values) that can be selected based on the accessory type. This allows the control characteristics to be adjusted for different applications without modifying the fundamental control architecture, resolving the contradiction between adaptability and complexity.
2Adaptability or versatility
If two standard sets of control characteristics (slow response and fast response) are provided, then some adaptability is achieved, but applications with requirements between these two settings cannot be satisfied
Solution Approach 1:
The patent segments the control characteristics into multiple predetermined sets, each optimized for specific accessory types. By dividing the control space into distinct segments (different gain settings for different applications), the system provides fine-grained adaptability without requiring continuous adjustment capabilities, thus expanding the range of satisfiable applications while maintaining simplicity.
3Ease of operation
If technicians are allowed to directly modify gain settings during maintenance, then adjustability is improved, but it causes more trouble due to lack of familiarity with PID control techniques
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing multiple sets of optimal gain settings for different accessory applications. This eliminates the need for technicians to perform complex real-time tuning during maintenance, as they can simply select from pre-prepared settings that are already optimized for specific applications, thus improving ease of operation without requiring deep PID knowledge.
Solution Approach 2:
The system provides self-service by automatically selecting the appropriate control characteristics based on the accessory type, reducing the need for manual intervention and expert knowledge. The controller can autonomously determine which predetermined set to use, making the system easier to operate while maintaining optimal performance.
Data Source
AI summary
Systems and methods are provided for controlling a power plant during use of a power take-off (PTO) device, wherein the responsiveness and stability of the controller are adjustable by an operator in the field. The use of setting maps allows fine tuning of controller responsiveness while also ensuring that expected performance would be achieved at any setting within the setting map. In some embodiments, a proportional-integral-derivative (PID) controller is used to control engine speed, and gains for the proportional, integral, and derivative terms are obtained from setting maps based on a responsiveness setting chosen by a vehicle operator.