AWD Drive Mode Switching for Traction and Fuel Efficiency
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Solution Overview
Problem
Existing vehicle control systems face a challenge in balancing fuel efficiency and traction performance when switching between two-wheel drive and four-wheel drive, particularly in autonomous driving scenarios, where four-wheel drive offers superior traction but lower fuel efficiency.
Innovation Solution
A control device and method that dynamically switch between two-wheel drive and four-wheel drive based on driving state parameters, expanding the two-wheel drive region during autonomous driving, using a slip ratio calculation unit and friction coefficient estimation to determine when to switch to four-wheel drive to maintain traction while minimizing fuel efficiency deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If four-wheel drive is executed to improve traction performance, then traction performance is improved, but fuel efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the drive mode between two-wheel drive and four-wheel drive based on real-time driving state parameters (vehicle speed, acceleration, steering angle, brake operation). The control device switches between drive modes to optimize the balance between traction performance and fuel efficiency, making the system adaptive rather than static
Solution Approach 2:
The patent changes the operational parameters by switching between different drive modes (two-wheel drive and four-wheel drive) based on measured driving state parameters. When parameters indicate low slip risk and moderate conditions, two-wheel drive is selected for fuel efficiency; when parameters indicate high slip risk or aggressive driving, four-wheel drive is activated for superior traction
2Use of energy by moving object
If two-wheel drive region is expanded during autonomous driving, then fuel efficiency is improved, but traction performance may deteriorate
Solution Approach 1:
The control device continuously monitors driving state parameters (vehicle speed, acceleration, steering angle, brake operation) and uses this feedback to determine whether to maintain two-wheel drive or switch to four-wheel drive. This closed-loop control ensures that fuel efficiency is optimized while traction performance is maintained through real-time adjustments
Solution Approach 2:
The patent uses multiple driving state parameters in advance to predict slip risk and proactively switch between drive modes before slip occurs. By monitoring acceleration, steering angle, and brake operation alongside vehicle speed, the system can anticipate traction needs and switch to four-wheel drive preemptively
Data Source
AI summary
A control device for a vehicle is provided with a region setting unit and a switching execution unit. The region setting unit is configured to set a drive region including a two-wheel drive region in which two-wheel drive is executed and a four-wheel drive region in which four-wheel drive is executed according to a driving state parameter. The switching execution unit is configured to switch between the two-wheel drive and the four-wheel drive according to a switching condition set in advance while the vehicle is traveling in the two-wheel drive region. The region setting unit is configured to expand the two-wheel drive region during autonomous driving compared to manual driving.