Four-Wheel Drive Mode Controller for Energy Efficiency
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Solution Overview
Problem
Conventional four-wheel drive vehicles often unnecessarily consume energy by maintaining the four-wheel drive mode even when it is not required, leading to increased fuel and electric consumption due to power loss from friction and energy conversion, as the mode selection is not adjusted based on the vehicle's operational conditions.
Innovation Solution
A control system that detects the previously selected mode before restarting the prime mover and automatically shifts to the two-wheel drive mode to reduce energy consumption, unless the four-wheel drive low mode was specifically selected for rough terrain or uphill driving, allowing manual mode selection to maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle is launched in the four-wheel drive mode after restarting the prime mover, then the vehicle can operate in high-traction mode, but fuel consumption increases due to power loss from friction
Solution Approach 1:
The system dynamically switches between four-wheel drive mode and two-wheel drive mode based on real-time detection of driving conditions and previously selected modes. The operating mode is not fixed but adapts to current needs, enabling the vehicle to operate in energy-efficient two-wheel drive mode during normal conditions while maintaining the capability to switch to four-wheel drive mode when traction is required.
Solution Approach 2:
The system changes the operational parameters of the drive system by detecting the previously selected mode before restarting the prime mover and automatically selecting an appropriate operating mode. This parameter change involves switching the drive mode from four-wheel drive to two-wheel drive based on detected conditions, thereby reducing power loss and fuel consumption while maintaining necessary traction capability.
2Reliability
If the motor is operated to launch the vehicle in four-wheel drive mode, then electric consumption increases, but the vehicle can operate on slippery surfaces
Solution Approach 1:
The system dynamically determines whether to operate the motor based on detected driving conditions and previously selected modes. Instead of continuously operating the motor in four-wheel drive mode, the system adapts by switching to two-wheel drive mode when appropriate, thereby reducing electric consumption while maintaining the capability to provide motor assistance when traction on slippery surfaces is required.
Solution Approach 2:
The system changes the operational state of the motor by detecting conditions before prime mover restart and automatically adjusting whether the motor should operate. This parameter change allows the vehicle to reduce electric consumption by keeping the motor inactive during normal conditions while maintaining the option to activate the motor when slippery surface conditions are detected.
3Power
If the power transmission device is rotated by engine torque in four-wheel drive mode, then the vehicle can transmit power to all wheels, but power loss increases due to friction
Solution Approach 1:
The system dynamically controls the engagement of the power transmission device by detecting previously selected modes before prime mover restart. Instead of continuously engaging the power transmission device in four-wheel drive mode, the system switches to two-wheel drive mode when appropriate, thereby reducing power loss from friction while maintaining the capability to engage all wheels when full power transmission is required.
Solution Approach 2:
The system changes the engagement state of the power transmission device based on detected conditions. By switching from four-wheel drive mode to two-wheel drive mode when appropriate, the system reduces the rotational engagement of the power transmission device, thereby reducing power loss from friction while maintaining necessary power transmission capability when needed.
Data Source
AI summary
A control system for a four-wheel drive vehicle configured to improve energy efficiency by avoiding selection of a four-wheel drive mode more than necessary. The control system comprises a controller that shifts an operating mode between a two-wheel drive mode and a four-wheel drive mode. When a control of the prime mover is terminated, the controller detects the operating mode selected by a switch before restarting the control of the prime mover. If the two-wheel drive mode or the four-wheel drive mode was selected by the switch before restarting the control of the prime mover, the controller selects the two-wheel drive mode when restarting the control of the prime mover.