Vehicle Engine Speed Control for Wheel Slip Prevention
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Solution Overview
Problem
Existing anti-slip systems for vehicles often cause engine stalling and excessive vibrations when reducing torque to prevent wheel slippage, leading to safety and performance issues, and are costly to implement with complex real-time torque regulation methods.
Innovation Solution
A method that determines wheel slippage and reduces the engine speed set-point value with a lowest limit to prevent stalling, allowing for adaptive adjustments based on climate and road conditions, reducing engine speed in controlled steps to maintain necessary oil pressure and minimize vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time torque regulation algorithm is developed to detect prevailing torque and adjust regulation to avoid stalling, then engine stalling is avoided, but the computing requirements and development costs become too high
Solution Approach 1:
The patent extracts the complex real-time torque detection and regulation algorithm from the system and replaces it with a simpler approach. Instead of continuously calculating and adjusting torque based on complex models, the system uses a predetermined lowest set-point value constraint with simpler control logic, significantly reducing computing requirements while maintaining reliability.
Solution Approach 2:
The invention replaces expensive, complex computational algorithms with a simpler, more cost-effective control strategy. By using predetermined limits and basic control logic rather than sophisticated real-time torque algorithms, the system achieves the same reliability outcome at lower development and implementation costs.
2Reliability
If engine speed is reduced to prevent wheel slippage, then wheel grip is improved, but excessive vibrations occur when engine speed becomes too low
Solution Approach 1:
The patent applies preliminary action by establishing the lowest permissible set-point value constraint before engine speed reduction begins. This predetermined limit prevents the engine speed from being reduced to levels that would cause excessive vibrations, thereby proactively avoiding the harmful effect while still allowing sufficient speed reduction to improve wheel grip.
Data Source
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Figure 3
Figure 4a~4b
AI summary
The invention relates to a method for influencing slippage of wheels (250a-d) of a motor vehicle (100; 110), comprising the step of determining whether there is a slipping state (Slip) of at least one wheel (250a-d) of the vehicle (100; 110). The method comprises also the step of, where applicable, reducing a set-point value (RPM*) for a speed of the engine (230) of said vehicle (100; 110), the reduction of said set-point value (RPM*) for said engine speed being limited downwards by a lowest set-point value (RPMmin) for said engine speed. The invention relates also to a computer programme product comprising programme code (P) for a computer (200; 210) for implementing a method according to the invention. The invention relates also to a device and to a motor vehicle which is equipped with the device.