Vehicle Drive Controller Mode Switching Shock Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicles with motors as drive sources experience a temporary decrease in actual driving force during mode switching of the motor's pole number, leading to discomfort for the driver due to generated shock.
Innovation Solution
A vehicle configuration with a motor and an engine as parallel drive sources, where the drive controller adjusts the target driving force of the engine to be higher than the motor's during mode switching, compensating for the motor's force decrease and minimizing shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor switches modes (changes pole number or torque type), then the motor can adapt to different driving conditions and improve overall efficiency, but the actual driving force temporarily decreases during switching causing driver discomfort
Solution Approach 1:
The drive controller predicts future driving force requirements and performs mode switching in advance before the actual need arises. By anticipating future driving conditions and switching modes proactively, the system ensures the motor is already in the optimal mode when needed, avoiding temporary driving force decreases and resulting driver discomfort.
Solution Approach 2:
The system dynamically adjusts the mode switching timing based on predicted future driving force requirements rather than using fixed switching criteria. The drive controller continuously monitors driving conditions and adapts the switching strategy in real-time, optimizing the balance between mode adaptability and maintaining smooth driving force delivery.
2Loss of energy
If mode switching is performed frequently to optimize performance, then energy efficiency improves, but the cumulative energy loss during switching increases
Solution Approach 1:
The drive controller performs mode switching in advance based on predicted future driving force requirements, rather than waiting for immediate needs. This proactive approach reduces the frequency and magnitude of emergency switching events, thereby minimizing cumulative energy losses during mode transitions while still maintaining optimal performance.
Solution Approach 2:
The system uses feedback from actual driving force requirements and mode switching performance to continuously optimize switching decisions. By monitoring the effectiveness of previous switching events and adjusting future switching timing accordingly, the system minimizes unnecessary switching operations and reduces cumulative energy losses.
Data Source
AI summary
A vehicle includes a motor, a second drive source, and a drive controller. The motor is a first drive source configured to drive wheels. The motor has a plurality of switchable modes that differ in at least one of a number of poles or a type of torque for rotating a rotor. The second drive source is configured to drive the wheels in parallel with the motor. The drive controller is configured to set, during switching of the modes, a target driving force of the second drive source to be larger than a target driving force of the second drive source before the switching of the modes.