Vehicle Driving Force Control for Turning Wheel Slip Prevention
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Solution Overview
Problem
Existing electronic stability control systems struggle to prevent wheel slip effectively, particularly in situations where the vehicle's load distribution changes due to acceleration, deceleration, or turning, leading to delayed compensation moments and reduced vertical forces on wheels.
Innovation Solution
A driving force control apparatus that calculates a required driving force and a limit driving force based on road surface conditions and vehicle state, using sensors to adjust driving forces to prevent exceeding the limit, and generates braking forces when necessary to maintain optimal wheel grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic stability control system applies braking force to correct vehicle behavior, then vehicle stability is improved, but the response time is delayed because control is performed only after instability is detected
Solution Approach 1:
The system performs preliminary action by predicting wheel slip risk before actual instability occurs. The processor calculates a slip risk index based on vehicle state information (acceleration, deceleration, turning) and proactively controls driving force to prevent wheel slip, rather than waiting to detect instability and then applying braking force.
Solution Approach 2:
The system uses feedback by continuously monitoring vehicle state information from sensors and adjusting driving force control based on the calculated slip risk index. The processor receives real-time data about acceleration, deceleration, and turning states, and dynamically modifies driving force to maintain optimal wheel grip conditions.
2Adaptability or versatility
If vehicle load shifts during acceleration or deceleration, then driving dynamics are improved, but vertical force on drive wheels is reduced causing wheel slip
Solution Approach 1:
The system applies dynamics by adapting driving force control to changing vehicle load conditions. The processor detects acceleration and deceleration states and dynamically adjusts the driving force limit accordingly - reducing the limit during acceleration to account for weight transfer to rear wheels, and adjusting during deceleration for weight transfer to front wheels, maintaining optimal wheel grip throughout the maneuver.
3Speed
If vehicle turns at high speed, then turning performance is improved, but centrifugal force reduces vertical force on inner drive wheel causing wheel slip
Solution Approach 1:
The system applies preliminary anti-action by counteracting the adverse effect of centrifugal force before wheel slip occurs. The processor detects turning states and calculates a slip risk index that accounts for the reduction in vertical force on the inner drive wheel. It then proactively limits driving force to prevent wheel slip, opposing the tendency toward slip before it actually happens.
4Productivity
If driving force is increased for acceleration, then productivity is improved, but wheel slip occurs when vertical force is reduced
Solution Approach 1:
The system applies parameter changes by dynamically adjusting the driving force limit based on vehicle operating conditions. The processor modifies the driving force parameter according to acceleration state, turning state, and calculated slip risk index, allowing maximum acceleration performance when conditions permit while preventing wheel slip when vertical force is reduced due to load transfer or turning effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents wheel slip by dynamically controlling driving forces, enhancing vehicle stability and turning performance by ensuring driving forces do not exceed the limit, thereby improving safety and maneuverability.
Implementation Method 1
a sensor configured to collect information associated with a state of vehicle
Implementation Method 2
a driving device configured to provide a driving force to a drive wheel of the vehicle
Implementation Method 3
controlling a driving force such that the required driving force does not exceed the limit driving force
Data Source
AI summary
A driving force control apparatus includes: a sensor that collects information associated with a state of a vehicle, a driving device that provides a driving force to a drive wheel of the vehicle, and a processor electrically connected with the sensor and the driving device. In particular, the processor calculates a required driving force of a driver and a limit driving force of the vehicle based on at least a portion of information collected by means of the sensor, in a situation where the vehicle is turning. The processor further controls the driving device such that the required driving force does not exceed the limit driving force.