Vehicle Speed Control via Preferred Operating Set
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Solution Overview
Problem
Existing vehicle speed control methods often result in inappropriate power losses, wear, and vibrations due to inefficient engine speed and transmission ratios, failing to maintain preferred operating conditions.
Innovation Solution
A method that determines a preferred speed set for a vehicle, adjusting the speed to ensure at least 80% of power flows through a step ratio power flow path in the power split assembly, thereby maintaining preferred operating conditions by automatically adjusting the vehicle speed within a predetermined power loss set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the requested speed is used directly, then the vehicle speed control is simple, but the drive train operates in working conditions with high power losses and inappropriate vibrations
Solution Approach 1:
The system changes the vehicle speed parameter to match preferred operating conditions. When the requested speed falls outside the preferred speed set, the control arrangement automatically adjusts the speed to the nearest preferred value, ensuring the drive train operates at optimal efficiency points while maintaining simple operational interface for the driver.
Solution Approach 2:
The control arrangement continuously monitors the requested speed and compares it against the predetermined preferred speed set. When a mismatch is detected, the system provides feedback by automatically adjusting the vehicle speed to a preferred value, creating a closed-loop control system that maintains optimal operating conditions without driver intervention.
2Loss of energy
If the engine speed and transmission ratio are selected for optimum power supply efficiency, then power losses are reduced, but the vehicle may not achieve the requested speed or may experience large power losses in transmission
Solution Approach 1:
The system establishes a predetermined preferred speed set containing multiple discrete speed values, each corresponding to optimal operating conditions of the drive train components. By constraining vehicle operation to these discrete preferred speeds, the system ensures both power efficiency and transmission optimization simultaneously, avoiding the compromise between speed request and efficiency.
Solution Approach 2:
The control arrangement dynamically adjusts the vehicle speed based on real-time comparison between requested speed and preferred speed set. The system can smoothly transition between preferred speed values while maintaining optimal drive train operation, adapting to changing driving conditions while preserving energy efficiency.
Data Source
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AI summary
The present disclosure relates to a method for controlling the speed of a vehicle (10). The vehicle (10) comprises a drive train (12) for driving the vehicle (10). Moreover, the vehicle (10) comprises a predetermined preferred speed set (34). The method comprises: . determining whether or not a substantially constant speed of the vehicle (10) is requested; . if it is determined that a substantially constant speed is requested, determining whether the requested speed lies within or outside of the predetermined preferred speed set (30), and . if it is determined that the requested speed lies outside of the predetermined speed set (30), automatically adjusting the speed of the vehicle (10) to a vehicle speed that is within the predetermined speed set (30).