Cruise Control Strategy for PTO Load Braking Torque Prediction
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Solution Overview
Problem
Current cruise control systems, especially predictive cruise controls, face limitations in energy savings due to the need for accurate information about future road conditions, and they often rely on constant speed control when auxiliary power consumers are connected, leading to increased energy consumption and operational costs.
Innovation Solution
A method that predicts future braking torque from the power take-off load, allowing for a planned driving strategy to be determined and implemented, enabling the use of predictive cruise control even when auxiliary power consumers are connected, thereby optimizing vehicle speed control and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a constant speed cruise control is used to maintain set speed regardless of road conditions, then the vehicle speed is maintained within a narrow allowable speed range, but the energy consumption increases due to unnecessary acceleration and braking
Solution Approach 1:
The system performs preliminary actions by predicting future braking torque from power take-off load before the vehicle encounters the actual load condition. This allows the cruise control to pre-adjust the driving strategy, reducing unnecessary acceleration and braking by preparing the vehicle in advance for upcoming energy demands from auxiliary power consumers.
2Use of energy by moving object
If a predictive cruise control is used with broader allowable speed range to save energy, then energy consumption is reduced, but the system requires sufficiently accurate information regarding future conditions which may not always be available
Solution Approach 1:
The system introduces an intermediary approach by focusing prediction specifically on power take-off load, which can be determined from current operational data rather than requiring external predictive information about road conditions. This intermediary metric bridges the gap between available data and energy optimization goals, allowing predictive control to function reliably even when traditional predictive information is unavailable.
3Stability of the object's composition
If the allowable speed range is narrowed to maintain set speed, then the vehicle speed remains stable, but the energy consumption increases particularly in heavy vehicles traveling uphill and downhill
Solution Approach 1:
The system performs preliminary actions by predicting future braking torque from power take-off load before the vehicle encounters the actual load condition. This allows the cruise control to pre-adjust the driving strategy, reducing unnecessary acceleration and braking by preparing the vehicle in advance for upcoming energy demands from auxiliary power consumers.
Data Source
AI summary
A control arrangement and a method for controlling vehicle speed of a vehicle using a cruise control system are provided. The vehicle comprises a power take-off connected to a powertrain of the vehicle. The method comprises a step of, in response to a determination that the power take-off is subjected to a load, predicting future braking torque resulting from the power take-off load. The method further comprises a step of determining a planned driving strategy for an upcoming road section taking into account the predicted future braking torque. The method further comprises controlling the powertrain in accordance with the planned driving strategy, thereby controlling vehicle speed of the vehicle.