AWD Line Lock Control for Uniform Tire Warming on Track
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Solution Overview
Problem
Existing tire warming systems for all-wheel-drive vehicles are not suitable, as they cannot effectively warm all driven tires simultaneously, unlike those for rear-wheel-drive vehicles.
Innovation Solution
A vehicle controller is programmed to alternate between braking and powering different wheel combinations on both the front and rear axles to achieve multi-phase tire warming, ensuring all driven tires are warmed efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tire-warmup systems are used in all-wheel-drive vehicles, then the system structure remains simple, but the tire warming effectiveness deteriorates because not all driven tires can be warmed simultaneously
Solution Approach 1:
The drivetrain is segmented into independent controllable units (front left, front right, rear left, rear right wheel assemblies), each with its own electric machine and brake. This allows selective powering and braking of individual wheels to achieve effective tire warming of all driven tires simultaneously.
Solution Approach 2:
The drivetrain configuration is made dynamic through the controller that can selectively route power from the powerplant to different wheel assemblies based on which tires need warming. The system transitions between different power routing states to warm different sets of tires.
2Productivity
If all driven tires are to be warmed simultaneously, then tire performance improves, but the control system complexity increases due to need for selective power routing
Solution Approach 1:
The tire warming process uses periodic action by alternating between different wheel assembly combinations. The controller cycles through different phases where different sets of wheels are powered and braked, ensuring all tires receive warming treatment over time.
Solution Approach 2:
The system uses the vehicle's own powerplant and existing wheel assemblies with electric machines and brakes to perform the warming function. The controller coordinates the existing components to achieve tire warming without requiring external warming equipment.
3Stability of the object's composition
If selective braking and powering of wheel assemblies is implemented, then uniform tire temperature is achieved, but the operational complexity increases
Solution Approach 1:
The system monitors tire temperatures and uses this feedback to determine which wheel assemblies should be powered and braked in each phase. The controller adjusts the powering and braking distribution based on temperature feedback to achieve uniform heating across all tires.
Solution Approach 2:
The system changes operational parameters (which wheels are powered, which are braked, power distribution levels) to achieve uniform tire temperature. The controller dynamically adjusts these parameters in different phases to ensure all tires reach optimal temperature.
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
This method allows for effective warming of all driven tires in all-wheel-drive vehicles, enhancing performance by ensuring uniform tire temperature, which is crucial for improved traction and handling.
Implementation Method 1
brake a first of the front wheels and a first of the rear wheels while powering a second of the front wheels and a second of the rear wheels to warm those tires
Implementation Method 2
energize the electric machine of a second of the wheel assemblies
Data Source
AI summary
A vehicle includes a powerplant, such as an engine, configured to power front and rear wheels, and a controller. The controller is programmed to, brake a first of the front wheels and a first of the rear wheels while powering a second of the front wheels and a second of the rear wheels to warm those tires, and subsequently brake the second front wheel and the second rear wheel while powering the first front wheel and the first rear wheel to warm those tires.